Backpack

Backing device

Technical field

The present invention generally relates to a backpack (backpack) for mounting something on the back, and more particularly to a backpack for conveniently mounting a compressed air cylinder on the back.

Background technique

Generally, a backpack (backpack) used to mount a compressed air cylinder on the back includes a flat back plate having a shoulder strap, a waist belt, and a cylinder fastening belt integrally formed with it as a single structure. In order to install the compressed air cylinder on the back using this kind of backing device, the compressed air cylinder is fastened to the back plate with a cylinder fastening strap, and then the user wears the two shoulder straps on the shoulders and puts the waist belt around the waist to install the compressed air cylinder on the back Compressed air cylinder.

As shown in FIG. 1, the conventional backing device includes a back plate 10, the back plate has a shoulder belt 30 connected to the back plate 10 and a waist belt 20 having a buckle 24, and a compressed air cylinder 50 is fastened to the back plate in a vertical position. 10.

The shoulder strap locking hole 11 is formed in the upper part of the back plate 10. The upper end of each shoulder strap 30 passes through each shoulder strap locking hole 11 and is sewn along the line S, thereby being connected to the locking hole 11. The cylinder fastening band 40 is connected to the middle of the back plate 10 to fasten the compressed air cylinder 50 to the back plate 10. A back belt 21 having buckles 22 at both ends thereof is connected to the lower part of the back plate 10 and worn around the back of the user's waist, and the waist belt 20 is connected to the buckles 22.

In this backing device, the back strap 21 is inserted into the back strap perforations 11a formed on both sides of the back plate 10, and the middle part of the back strap perforation 11a is placed on the back plate 10, as shown by the dotted line in the figure. The lower end of each shoulder strap 30 is sewn along another sewing line S to be connected to each of the outer portions of the back strap 21 having the buckle 22.

Since the lower ends of the shoulder straps 30 are respectively sewn to the outer part of the back strap 21 along the horizontal sewing line S, the lower ends of the shoulder straps 30 are placed parallel to the longitudinal axis of the back strap 21.

The lower end of the shoulder strap 30 is sewn to the back strap 21 along the sewing line S as described above. Thus, the shoulder strap 30 is integrated with the back strap 21, and the back plate 10 is integrated with the shoulder strap 30 and the back strap 21 into a single structure.

A pair of support hooks 12 are provided on the center of the lower part of the back plate 10 and support the neck of the air cylinder 50 with the adjuster 56. The L-shaped metal support frame 15 produced separately from the back plate 10 is installed to the lower end of the back plate 10 through a bolt connection process. Due to the support frame 15, the user can support the back plate 10 on the support surface when wearing the shoulder strap 30.

A flash 13 indicating the position of the user is provided on the back plate 10 on opposite sides of the pair of supporting hooks 12. A battery box 14 in which a battery is held to supply electricity to the flash 13 is provided on the lower part of the back surface of the back plate 10 at a position close to the flash 13.

In the figure, reference numeral 55 denotes an air hose connected to the regulator 56 of the compressed air cylinder 50.

In order to install the compressed air cylinder 50 on the back of the above-mentioned backrest device, the compressed air cylinder 50 is placed on the back plate 10 in the upper and lower positions, and the neck of the cylinder 50 is supported by the supporting hook 12. Then, the barrel 50 is fastened to the back plate 10 by the barrel fastening tape 40.

After placing the back plate 10 on the supporting frame 15, the user installs the compressed air cylinder 50 on the back by wearing the shoulder strap 30 and the waist belt 20.

However, when a user with a conventional backrest device on the back bends the upper body to the left or right, the strap 21, waist strap 20, shoulder strap 30, and back plate 10, which are integrated into a single structure, move together with the bending movement of the user's body . Thus, the compressed air cylinder 50 is inclined in the same direction as the user's upper body and at the same angle as the user's upper body.

Due to the inclination of the compressed air cylinder 50, the center of gravity of the cylinder 50 is shifted, which makes it easy for the user to fall down in the direction in which the air cylinder 50 is inclined.

Especially when the user of the backpack is a firefighter and falls on the fire scene due to the change of the center of gravity of the compressed air cylinder 50, the user will encounter misfortune.

In addition, in the conventional sling device, the shoulder strap 30 is connected to the shoulder strap 21 to form an integral structure. Thus, when the user with the backrest device raises his arm, the shoulder belt 21 tightens the shoulder belt 30. Thus, the shoulder strap 30 presses the user's shoulder. Therefore, a user with a backrest device is inconvenient when using the arm due to the restraint caused by the shoulder strap 21 and the shoulder strap 30.

In addition, since the battery box 14 is placed on the back of the back plate 10, when the battery needs to be replaced with a new battery, the user must remove the back-mounted device. Therefore, it is inconvenient to replace the battery with a new battery and excessive time must be spent when replacing the battery.

In addition, the support frame 15 supporting the back plate 10 is shaped as an inclined structure, and when a user with a backrest device on his back moves around a place, the structure is likely to be stuck on a protruding object such as a steel bar. Also, the support frame 15 is made of steel, which causes the weight of the backrest device to increase.

When the support frame 15 of the backrest device is stuck on the protruding object when the firefighter is fighting the fire, the firefighter must release the support frame 15 from the protruding object, thereby delaying the fire fighting work. In addition, due to the support frame 15 that can easily get stuck on protruding objects, firefighters may have difficulty quickly escaping from danger in a fire scene.

In addition, since the support frame 15 and the back plate 10 are produced separately, the support frame 15 must be connected to the back plate 10 through another process, which increases the time required to produce the back plate.

Excessive time consumption during the backplane production process leads to a reduction in the number of backplanes produced.

Summary of the invention

Therefore, the present invention takes into account the above-mentioned problems in the prior art. The object of the present invention is to provide a back-belt device in which the waist belt and the shoulder belt move independently of the back plate, the shoulder belt moves independently of the waist belt, and the waist belt worn on the user The inclination angle of the shoulder strap (the movable angle in the upward, downward, forward and backward directions) can be freely adjusted as required.

Another object of the present invention is to provide a back cover device in which the position of the battery box is changed from the conventional position, thereby allowing easy replacement of the battery, and the back cover device is produced without the traditional connection of the support frame to the back plate The process in which the structure of the support frame is changed to prevent the support frame from getting stuck on protruding objects.

In order to achieve the above-mentioned object, the present invention provides a back leaning device, the back leaning device includes: a back plate, the back plate holds one end of the shoulder strap on the upper part thereof and holds the tube fastening belt on both sides of the middle part, and It includes a pair of support hooks that protrude from the lower part of the back plate while being spaced apart from each other to support the compressed air cylinder thereon; a shoulder strap support, the shoulder strap support on its opposite arm Hold the other end of the shoulder strap and connect to the lower part of the back of the back plate to rotate up and down around its center, and the opposite arms of the shoulder strap support extend horizontally and longitudinally in opposite directions; waist protector The waist protector is plate-shaped and is connected to the back plate at a position on the back of the shoulder strap support, so that both ends of the waist protector rotate up and down around the center of the waist protector, And the end of the waist belt is connected to the end of the waist protector so that the waist protector covers and protects the back of the users waist; and a rotating unit for rotatably holding the shoulder The belt support and the waist protector are supported on the back plate.

The rotation unit may include a hinge shaft that protrudes from the center of the waist protector and sequentially passes through the center of the shoulder strap support and the center of the lower portion of the back plate, thereby serving as The waist protector and the rotation shaft of the shoulder strap support; a hinge shaft cover, the hinge shaft cover is mounted to the hinge shaft in a position in front of the back plate to rotatably connect the hinge shaft To the back plate; and a locking piece that locks the hinge shaft cover to the hinge shaft.

Thus, the waist belt and shoulder belt of the back panel are operated separately from the back panel around the hinge axis, and the waist belt and the shoulder belt are operated separately, so that the user can work freely without being restricted or compressed by the waist belt or the shoulder belt.

The rotation unit may further include a rotation guide device for guiding rotation of the shoulder strap support. The rotation guide device may include: longitudinal guide holes formed on both sides of each of the longitudinal rectangular plate and the back plate of the shoulder strap support; and a belt passing through the longitudinal guide hole The rod-shaped protrusion of the flange, and a plate-shaped or ring-shaped lock piece is installed to the end of each of the rod-shaped protrusions with flange, so that the shoulder-shaped rod protrusion with flange It moves in the longitudinal guide hole during the rotation of the shoulder strap support.

The protrusion and the locking member may respectively include a ring nut with a flange at its end and a washer-shaped cover mounted to the end of the ring nut with a locking screw. Alternatively, the protrusion and locking member may include a pinned bolt having a head corresponding to the flange and threads on the end thereof, and a nut fastened to the end of the pinned bolt. As a further option, the protrusion and the locking member may respectively include a pin with a flange at one end and an annular fitting groove at the other end, and a snap ring fitted on the fitting groove formed on the end of the pin.

The rotation unit may further include a rotation angle control device for controlling the rotation angle of the waist protector. The rotation angle control device may include: the hinge shaft cover having a rectangular shape and mounted to an end of the hinge shaft; and an inclined protrusion formed on the back on the opposite side of the hinge shaft cover. On the board, to stop the hinge shaft cover during the rotation of the hinge shaft cover, thereby causing the waist protector to rotate within an angle range determined by the inclination angle of the protrusion.

The backrest device may further include: a lifting component that vertically moves the waist protector on the back plate while sliding the protector on the back plate.

The lifting assembly may include: a guide boss that protrudes from the waist protector and faces the rotation unit so as to be perpendicular to the waist protector during vertical movement of the waist protector Moving, a vertical slot is formed on the front of the guide boss; a lifting guide placed closely on the back of the guide boss; a guide protrusion, the guide protrusion extends from the lifting guide To pass through the vertical slot of the guide boss, and connect to the rotating unit at its end, thereby guiding the guide boss to move vertically; The guide protrusion is mounted to the lock piece of the rotation unit.

The lifting of said assembly may further comprise: means for the waist protector during forward and rearward movement of the tilting device tilting the waist protector.

The tilting device may include: a lifting guide having an inclined surface to define a triangular cross section; and a guide ring member having a triangular cross section corresponding to the lifting guide and fitting in the lifting guide On the guide protrusion and closely placed on the front of the guide boss, so that the lifting guide and the guide ring perform up and down movement, and at the same time the guide is supported by its convex portion with the inclined surface Boss.

The backrest device may further include: an anti-friction member, the anti-friction member is ring-shaped and fits in the position between the guide boss and the lifting guide On the guide protrusion, thereby preventing the guide boss from directly contacting the lifting guide.

Description of the drawings

FIG. 1 is a perspective view describing a conventional backrest device; FIG. 2 is a perspective view describing a backrest device according to a first embodiment of the present invention; FIG. 3 is an exploded perspective view describing the structure of the backrest device shown in FIG. 2 Figure; Figure 4 is a front view describing the back plate shown in Figure 2; Figure 5 is a front view describing the shoulder strap support shown in Figure 2; Figure 6 is a description of the waist protector shown in Figure 2 Front view; FIG. 7 is a cross-sectional view along line AAin FIG. 6 describing part of the waist protector shown in FIG. 2; FIG. 8 is a front view describing the operation of the waist protector shown in FIG. 2; 9 is a front view describing the operation of the shoulder strap support shown in FIG. 2; FIG. 10 is a side view describing the state of use of the backrest device according to the first embodiment of the present invention; FIG. 11 is a description of the second embodiment of the present invention. Figure 12 is an exploded perspective view of the backrest device shown in Figure 11; Figure 13 is a front view of the backplane shown in Figure 11; Figure 14 is a perspective view of the backplane shown in Figure 11 The front view of the shoulder strap support shown;

Fig. 15 is a front view of the waist protector shown in Fig. 11; Fig. 16 is a sectional view taken along line BB' in Fig. 15; Fig. 17 is an exploded perspective view of the rising assembly shown in Fig. 15; Fig. 18 is a description A longitudinal cross-sectional view of the connection state of the back plate, the shoulder strap support and the waist protector shown in FIG. 11; FIG. 19 is a view describing the use state of the shoulder strap support shown in FIG. 11; Fig. 21 is a view describing the state of the waist protector shown in Fig. 11 in the ascending and descending motion; and Fig. 22 is a view describing the state of the waist protector shown in Fig. 11 View of the state of the waist protector in the movement of moving forward and backward.

detailed description

Hereinafter, the backpack according to the present invention will be described with reference to the accompanying drawings. In the following description, the common components of the conventional backpack and the backpack according to the present invention will use the same reference numerals.

In the drawings, FIG. 2 is a perspective view illustrating a backpack according to a first embodiment of the present invention. Fig. 3 is an exploded perspective view describing the structure of the backpack shown in Fig. 2. Fig. 4 is a front view describing the back plate shown in Fig. 2.

Fig. 5 is a front view of the shoulder strap support shown in Fig. 2. Fig. 6 is a front view of the waist protector shown in Fig. 2. FIG. 7 is a cross-sectional view along line AAin FIG. 6 describing a portion of the waist protector shown in FIG. 2.

Fig. 8 is a front view describing the operation of the waist protector shown in Fig. 2. Fig. 9 is a front view describing the operation of the shoulder strap support shown in Fig. 2. Fig. 10 is a side view describing the state of use of the backpack according to the first embodiment of the present invention.

As shown in Figs. 2 and 3, the backrest device according to the first embodiment of the present invention includes a backplane 100. The shoulder strap locking hole 102 is formed at the upper portion of the back plate 100 and supports the end of each shoulder strap 30 passing through each locking hole 11. Belt support holes 103 are formed on both sides of the middle of the back plate 100, and the barrel fastening belt 40 is sequentially passed through the holes 103, thereby being supported. The cylinder fastening band 40 thereby fastens the compressed air cylinder 50 to the back plate while tightly passing through the outer surface of the cylinder 50. A pair of supporting hooks 105 are provided on the lower part of the back plate 100. Support hooks 105 spaced apart from each other protrude from the back plate 100 to support the compressed air cylinder 50 fastened on the back plate 100 by the cylinder fastening band 40 thereon.

In the backing device, the upper part of the back plate 100 with the shoulder strap locking hole 102 is triangular, and the protruding part is on the opposite side thereof, as shown in the figure. The shoulder strap locking holes 102 are respectively formed on the protruding parts of the triangular upper part of the back plate 100. The specific triangle on the upper part of the back plate 100 is designed according to the following considerations. That is, when the two shoulder strap locking holes 102 are separated by a large distance from each other, the shoulder strap 30 connected to the shoulder strap locking hole 102 can be placed tightly around the shoulders of the user who installs the backrest device 100 on the back.

If the backboard 100 does not have such a protruding part on its upper part, the upper part of the shoulder strap 30 is placed tightly around the back of the users neck while forming a V-shaped structure, thereby strongly stretching the back of the users neck unit. In the above-mentioned state, since the upper part of the shoulder strap 30 is subjected to a high degree of stress, the user feels severe pain in the back of the neck.

However, when the upper portion of the shoulder strap 30 is placed around the user's shoulder instead of the back of the user's neck, the shoulder strap 30 presses the user's shoulder downward in the vertical direction. Thus, the pressure exerted by the shoulder strap 30 on the user is evenly distributed, so that the user is protected from severe pressure.

As shown in FIGS. 2 and 3, the back plate 100 also includes two flashing lights 104 arranged on opposite sides of the lower part of the back plate 100 to indicate the position of the user; and a protective plate 140, which has It has a predetermined width and extends downward from the lower end of the back plate 100 as shown in FIG. 10 while being bent at the lower part thereof to protrude forward from the back plate 100. The protective plate 140 protects the end of the compressed air cylinder 50 fastened to the back plate 100 and whose end faces the plate 140.

The protective plate 140 preferably includes a pair of reinforcing ribs 142 integrally extending along opposite side edges of the forward bent portion of the protective plate 140 to increase the strength of the protective plate 140 in the vertical direction; and for installing a battery therein to supply the back plate 100 The flash 104 electric battery box 106. The battery box 104 is disposed between a pair of reinforcing ribs 142 that protect the opposite sides of the battery box 106.

The reinforcing ribs 142 increase the strength of the protective plate 140 as described above, thereby preventing the protective plate 140 from being damaged due to bending. In addition, the ribs 142 define a space for installing the battery for the flasher 104 therebetween. That is, the battery box 106 is disposed in the space defined between the two reinforcing ribs 140. Of course, in order to prevent the battery from accidentally ejecting from the battery box 106, the box cover 106a must be installed to the battery box 106 as shown in the figure. In order to make the cover 106a waterproof, the cover 106a preferably has a waterproof seal 106b.

The backboard of the present invention also includes a longitudinal shoulder strap support 130 as shown in FIGS. 2 and 3. The shoulder strap support 130 is connected to the lower part of the back of the back plate 100, and the opposite arms of the support 130 extend horizontally in the opposite direction. In the above state, the longitudinal shoulder strap support 130 rotates up and down around the center. The ends of the shoulder strap 30 are respectively connected to the opposite arms of the shoulder strap support 130.

As shown in FIG. 5, the shoulder strap support 130 includes a longitudinal rectangular plate 132 that is an elastic body to be elastically bent so as to surround the waist of the user. The rectangular plate 132 is connected to the back plate 100 to rotate upward and downward about its center. The shoulder strap support 130 further includes a shoulder strap connection bracket 134 connected to each end of the longitudinal rectangular plate 132 by a hinge H so as to bend forward and backward around the hinge H. The shoulder strap connection bracket 134 has a strap connection hole 134a. The other end of each shoulder strap 30 is inserted into the strap connection hole 134a to be locked thereto.

The rectangular plate 132 is a longitudinal body as shown in the figure, and the plate 132 has elasticity. When the user wears the shoulder strap 30 on the shoulder, the two ends of the rectangular plate 132 bend like an open bow due to the tension caused by the end of the shoulder strap 30 in the backward direction. That is, when the shoulder strap 30 is worn, the end of the shoulder strap 30 tensions the shoulder strap connection bracket 134 of the rectangular plate 132, thereby bending the rectangular plate 132. Therefore, the shoulder strap 30 is comfortably worn on the shoulders, so that the stress on the user caused by wearing the shoulder strap 30 can be minimized.

The strap connection hole 134a of each shoulder strap connection bracket 134 is preferably designed as a longitudinal hole extending along the upper edge of the bracket 134 as shown in FIGS. 2 and 3. In particular, the belt connection hole 134a is preferably inclined downward with respect to the horizontal axis shown in FIG. 5 at an inclination angle β of 22° to 55° in the direction from the inner side to the outer portion of the bracket 134. Due to the inclination angle β, the end of each shoulder strap 30 is preferably connected to the bracket 134 in an inclined posture.

Due to the inclination of the lower end of the shoulder strap 30, the shoulder strap 30 is more comfortable to wear on the user's shoulder, so that the user can more conveniently and comfortably install the backrest device. Of course, the above-mentioned advantages of the shoulder strap 30 are produced by this structure, that is, the end (lower end) of the shoulder strap 30 is inclined so as to avoid being twisted when the user wears the shoulder strap 30.

However, if the fixed lower end of the shoulder strap 30 is arranged horizontally in the same manner as the conventional backrest device, the shoulder strap 30 will be severely twisted, compressing or interfering with both sides of the user, thereby causing the backrest device to be installed on the back. Of users are very uncomfortable and stressed. However, the present invention prevents such twisting of the belt to protect the user from such discomfort or stress.

In addition, as shown in FIGS. 2 and 3, the waist protector 120 covering and protecting the back of the user's waist is connected to the back panel 100 at a position on the back of the shoulder strap support 130. Both ends of the waist protector 120 rotate upward and downward around the center of the protector 120, and the ends of the waist belt 20 are connected to the two ends of the waist protector 120, respectively.

The buckle 121a is connected to each end of the waist protector 120 and to each end of the waist belt 20 as shown in FIG. 6. As shown in the figure, the buckle 121 a may be connected to each end of the connection belt 121 supported by the waist belt protector 120 through the protector 120. Alternatively, the buckle 121a may be directly connected to each end of the waist protector 120 to form a single structure different from the structure shown in the figure. In this embodiment, the buckle 121a is connected to each end of the waist protector 120 by a connecting strap 121, while the buckle 121a connects the waist belt 20 to the waist protector 120 to form a single body.

As shown in FIGS. 6 and 7, the waist protector 120 preferably includes a plate-shaped cushion member 124; a plastic support panel 126 that is tightly mounted to the surface of the cushion member 124 and has a predetermined strength to prevent the cushion member 124 from bending; and a covering The cushion member 124 and the flame-retardant soft cover 122 of the plastic support panel 126, and the opening 122a is formed on a predetermined portion of the surface of the flame-retardant soft cover 122 to expose a part of the central portion of the support panel 126 to the outside. In the waist protector 120, the flame-retardant soft cover 122 is preferably made of a fabric formed of a flame-retardant material or coated with a flame retardant.

In addition, the backrest device of the present invention includes a rotating unit that rotatably supports the shoulder strap support 130 and the waist protector 120 on the back plate 100 (thereby, the shoulder strap support 130 and the waist protector 120 Rotate around its center).

As shown in FIGS. 3 and 7, the rotation unit includes a hinge shaft 250 that protrudes from the center of the waist protector 120 and sequentially passes through the center of the shoulder strap support 130 and the center of the lower portion of the back plate 100, thereby It is used as a rotation axis for the waist protector 120 and the shoulder strap support 130 to rotate around.

As shown in FIG. 3, the rotating unit further includes a hinge shaft cover 255, the diameter of the hinge shaft cover 255 is greater than the diameter of the hinge shaft 250, and the hinge shaft cover 255 is formed integrally with the hinge shaft 250 at a position in front of the back plate 100 A single structure thereby rotatably connects the hinge shaft 250 to the back plate 100.

The rotating unit further includes a plurality of locking pieces 290, as shown in FIG. 3, which pass through the hinge shaft cover 255 and are fastened to the hinge shaft 250, thereby locking the hinge shaft cover 255 to the hinge shaft 250.

In the above state, in order to allow the hinge shaft 250 to pass through, the shoulder strap support 130 and the back plate 100 must be provided with hinge shaft passing holes 250a and 260b. The diameter of the hinge shaft cover 255 is larger than the diameter of the hinge shaft passing holes 250 a and 260 b, so that the hinge shaft 250 rotates while being supported by the back plate 100.

Therefore, due to the hinge shaft cover 255 connected to the hinge shaft 250 by the lock 290, the hinge shaft 250 is rotatably connected to the shoulder strap support 130 and the back plate 100. The shoulder strap support 130 and the waist protector 120 rotate around the hinge shaft 250.

As shown in FIG. 7, the hinge shaft 250 has a flange on its side and is adhered to the cushion member 124 of the waist protector 120 by the flange by using a double-sided tape. The hinge shaft 250 is thereby mounted to the waist protector 120 and passes through the support panel 126 tightly mounted to the cushion member 124 and protruding from the opening 122 a of the flame-retardant soft cover 122.

In FIG. 7, the mark W represents a washer, which is fitted on the hinge shaft 250 and is interposed between the flange of the hinge shaft 250 and the support panel 126 of the waist protector 120, thereby preventing when the hinge shaft 250 is set to pass through the support When the panel 126 is installed, the flange of the hinge shaft 250 moves out of the support panel 126. It is preferable to use the aforementioned washer W when the flange size of the hinge shaft 250 is small. If the flange has a larger diameter like the washer shown in the figure, the washer W may not be used in the structure.

Meanwhile, the rotation unit of the backpack of the present invention may further include a rotation guide device that guides the rotation of the waist protector 120 and the shoulder strap support 130 and controls their rotation angles.

As shown in FIGS. 3 and 7, the rotation guide device includes two guide protrusions 260, which are provided on opposite sides of the waist protector 120 and have internal threads, respectively. Two first longitudinal guide holes 260a and two second longitudinal guide holes 260b are respectively formed on opposite sides of the lower portion of the back plate 100 and the shoulder strap support 130, two first longitudinal guide holes 260a and two second longitudinal guide holes 260a The two longitudinal guide holes 260b have an arc-shaped appearance and two guide protrusions 260 pass through them. After the two guide protrusions 260 have sequentially passed through the first guide hole 260a and the second guide hole 260b, it is preferable that the protrusion cover 265 is installed to the guide protrusion 260 using the locking screw 290a as shown in FIG. 3. In the above state, the outer diameter of the protrusion cover 265 is larger than the width of the first guide hole 260a.

Therefore, the guide protrusion 260 moves upward and downward along the first guide hole 260a and the second guide hole 260b during the rotation of the waist protector 120 and the shoulder strap support 130. In the above state, the rotation angle of the waist protector 120 and the shoulder strap support 130 is restricted by the guide protrusion 260, thereby preventing the waist protector 120 and the shoulder strap support 130 from rotating at 360°.

In the present invention, as shown in FIGS. 4 and 5, the first guide hole 260a formed on the back plate 100 and the second guide hole 260b formed on the shoulder strap support 130 are preferably designed to respectively surround the passing back The center of the hinge axis 250 of the board 100 has arcs θ (22°-28°) and α (7°-13°). Thus, the arcs θ and α determine the lengths of the first guide hole 260a and the second guide hole 260b.

When the radians θ and α are set to 22°-28° and 7°-13°, respectively, the waist protector 120 and the shoulder strap support 130 rotate within a specific angle range determined by the radians θ and α. Of course, the arcs θ and α take into account the movement design of the user's arms and waist, so that the user can use the backrest device comfortably.

The rotation of the waist protector 120 and the shoulder strap support 130 according to the arcs θ and α will be described in detail with reference to FIGS. 8 and 9 as follows. In the following description, the arcs θ and α of the waist protector 120 and the shoulder strap support 130 are set to 22° and 7°, respectively.

First, as shown in FIG. 8, the waist protector 120 rotates around the hinge shaft 250 at 22° due to the arc θ (set to 22°) of the first guide hole 260a formed on the back plate 100. At the same time, as shown in FIG. 9, the shoulder strap support 130 rotates around the hinge shaft 250 at 7° due to the arc α of the second guide hole 260 b. However, due to the arc θ (set to 22°) of the first guide hole 260a of the back plate 100, the shoulder strap support 130 also rotates around the hinge shaft 250 at 22°. That is, because the shoulder strap support 130 is separated from the waist protector 120, the shoulder strap support 130 also rotates in the arc θ of the first guide hole 260a.

Thus, the user of the backrest can comfortably move the waist within the range allowed by the rotation angle of the lumbar support 120, and move the shoulders and arms more comfortably within a range wider than the range allowed by the rotation angle of the waist. As a result, the user can move his body almost freely while installing the backrest device on his back.

At the same time, the guide protrusion 260 of the rotation guide device is provided on its side surface together with the flange in the same manner as described for the hinge shaft 250. As shown in FIG. 7, the flange of the guide protrusion 260 is adhered to the cushion member 124 of the waist protector 120 with a double-sided tape. When the flange of the guide protrusion 260 is connected to the cushion member 124, the guide protrusion 260 passes through the support panel 126 and protrudes from the opening 122a of the flame-retardant soft cover 122. In the above case, the washer W may be fitted on the guide protrusion 260 in the same manner as the hinge shaft 250.

In the drawings referred to in the above description of the structure of the backrest device, the reference number 300 denotes an anti-friction member, which is made of plastic or stainless steel, and is fitted on the hinge shaft 250 and the guide protrusion 260, and at the same time introduces Between the waist protector 120, the shoulder strap support 130, the back plate 255 and the raised cover 255, as shown in FIG. 3.

In addition, reference numeral 55 denotes an air hose that supplies air to the user from the compressed air cylinder 50, and reference numeral 56 denotes a regulator 56 that adjusts the pressure of the compressed air supplied from the cylinder 50.

Hereinafter, the operation of the backpack of the above-mentioned structure according to the first embodiment of the present invention will be described with reference to FIGS. 8 to 10.

First, the user of the backrest device according to the first embodiment of the present invention fastens the compressed air cylinder 50 to the backboard 100 using the same fastening strap 40, and then makes the backboard 100 stand vertically before putting on the shoulder strap 30, At the same time, the protective board 140 is placed on the ground or on the desktop.

When the protective plate 140 is placed on the ground or the desktop, the lower part of the back plate 100 may collide with the ground or the desktop due to the heavy weight of the air cylinder 50. In the above state, an impact is applied to the lower part of the back plate 100. However, the protective plate 140 of the back plate absorbs the impact to protect the regulator 56 of the air cylinder 50 from the impact.

In addition, the user of the backrest device is connected to the shoulder strap support 130 and can be bent forwards and backwards due to the shoulder strap connection bracket 134 and the shoulder strap connection bracket 134 formed on the shoulder strap connection bracket 134 and has a downward inclination angle β. The strap connection hole 134a makes it easy to wear the shoulder strap 30.

After wearing the shoulder belt 30, the user surrounds the waist with the waist belt 20 connected to the waist protector 120 and fastens the waist belt 20 with the buckle 24. Thus, the backrest device of the present invention is installed on the back of the user, and the compressed air cylinder 50 is fastened to the backrest device. In the above state, even if the heavy air cylinder 50 is installed on the back of the user, the backrest device is not hard on the back of the user due to the pad 124 of the waist protector 120.

As shown in FIGS. 8 and 9, the waist protector 120 and the shoulder strap support 130 are due to the pivoting unit and the pivoting guide device as the hinge shaft 250 and the guide protrusions inserted into the first guide hole 260a and the second guide hole 260b. 260 rotates independently. Of course, the waist protector 120 and the shoulder strap support 130 move independently from the back panel 100. That is, the back plate 100 does not interfere with the waist protector 120 or the shoulder strap support 130 even when the protector 120 and the support 130 are rotated.

Since the waist protector 120 and the shoulder strap support 130 independently rotate as described above, the user of the back-mounted knapsack can move freely and comfortably without being restricted by the waist belt 20 or the belt 390.

In particular, the backboard 100 does not interfere with the waist protector 120 or the shoulder strap support 130, and does not move even if the user moves the waist and/or the compressed air cylinder 50 whose arms are fastened to the backboard 100. Thus, the center of gravity of the air cylinder 50 does not move regardless of how the user moves.

Since the backrest device stably maintains the compressed air cylinder 50 and does not allow the center of gravity of the air cylinder 50 to move, the user can move more freely without falling down due to the movement of the center of gravity of the air cylinder 50.

When the user wears the back-mounted device of the present invention, the flash 104 provided on the back plate 100 is turned on to indicate the user's position. In the above state, electricity is supplied to the flash 104 from the battery installed in the battery box 106.

The battery installed in the battery box 106 after opening the cover 106a covering the battery box 106 can be easily replaced with a new battery. In addition, since the battery box 106 is disposed on the front face of the back plate 100 fastened by the compressed air cylinder 50, it is easier for the user to replace the battery with a new battery.

In other words, if the battery box 106 is arranged on the back of the back plate 100 in a conventional manner, the user must remove the back-mounted device when the battery needs to be replaced with a new battery. However, the battery box 106 of the present invention is provided on the front face of the back plate 100, so that it is easy to replace the battery.

As described above, the backrest device of the present invention flashes from the flash 104, so other people can easily determine the position of the user wearing the backrest device. As a result, the user wearing the backpack and other people around the user work in a dangerous place while frequently checking their positions. In addition, the user should frequently check the amount of air remaining in the compressed air cylinder 50 fastened to the back plate 100 while working.

Of course, an alarm unit (not shown in the figure) such as a whistle that notifies the user that the amount of compressed air remaining in the air cylinder 50 is low is installed on the air hose 55 connected to the compressed air cylinder 50. However, in addition to the alarm unit, it is recommended to frequently check the amount of compressed air remaining in the air cylinder 50 in order to ensure the safety of the user. When the alarm unit generates an alarm signal, the user must move from a dangerous place to another place with a sufficient amount of fresh air. In addition, the user should frequently check the amount of air remaining in the compressed air cylinder 50 while working.

The protective plate 140 of the backrest device according to the present invention is in the shape of a plate, so the protection plate 140 will not be caught on any protruding objects such as steel bars when a user with a backrest device on his back moves around. In addition, the protective plate 140 protects the compressed air cylinder 50 and the regulator 56 from protruding objects.

Furthermore, when the lower end of the shoulder strap 30 is installed to the strap connection hole 134a of the shoulder strap support 130 and is inclined at the same time, the backrest device provides the user of the backrest device with a large range of comfortable movement of the shoulders without being hindered.

Figures 11 to 22 show a backpack according to a second embodiment of the present invention. Hereinafter, a backpack according to the second embodiment will be described with reference to the drawings. In the following description, the elements in the second embodiment that are similar to the elements in the first embodiment will have the same reference numerals as in the first embodiment, and the second embodiment is different from the second embodiment. The components will be designated by the "500" series of labels.

Fig. 11 is a perspective view illustrating a backpack according to a second embodiment of the present invention. Fig. 12 is an exploded perspective view of the backpack shown in Fig. 11. Fig. 13 is a front view of the back plate shown in Fig. 11.

In addition, FIG. 14 is a front view of the shoulder strap support shown in FIG. 11. Fig. 15 is a front view of the waist protector shown in Fig. 11. Fig. 16 is a cross-sectional view taken along line BB' in Fig. 15. Fig. 17 is an exploded perspective view of the ascending assembly shown in Fig. 15. Fig. 18 is a longitudinal sectional view describing the connection state of the back plate, the shoulder strap support and the waist protector shown in Fig. 11.

In addition, FIG. 19 is a view describing a state of use of the shoulder strap support shown in FIG. 11. Fig. 20 is a view describing the state of the waist protector shown in Fig. 11 in a rotating movement. Fig. 21 is a view describing the state of the waist protector shown in Fig. 11 in raising and lowering motions. Fig. 22 is a view describing the state of the waist protector shown in Fig. 11 in the forward and backward moving movement.

As shown in FIGS. 11 and 12, the backrest device according to the second embodiment of the present invention includes a backboard 100, a tube fastening belt 40 and a supporting hook 105 are respectively provided on the middle and lower parts of the backboard 100, and a shoulder strap The upper end of 30 is mounted to the upper part of the back plate 100.

In addition, the shoulder strap support 130 and the waist protector 120 are rotatably mounted to the back plate 100 by a rotating unit having the same structure as the first embodiment. The shoulder strap support 130 includes a longitudinal rectangular plate 132 to which the lower end of the shoulder strap 30 and the waist belt 20 are connected. In other words, the shoulder strap support 130 and the waist protector 120 are rotatably installed to the back plate 100 through the hinge shaft 250, and one end of the hinge shaft 250 is installed to the waist protector 120. The other end of the hinge shaft 250 passes through the rectangular plate 132 of the shoulder strap support 130 and the back plate 100 and is integrated with the hinge shaft cover 255.

In the backrest device of the second embodiment, two shoulder strap locking holes 102 holding the upper end of the shoulder strap 30 are formed in the upper part of the back plate 100, as shown in FIG. 11. Both sides of the upper edge of the upper part of the back plate 100 protrude upward as shown in the figure, and the shoulder strap locking holes 102 are formed on the upper protruding part of the upper part of the back plate 100. Thus, the pressure applied from the upper portion of the shoulder strap 30 to the shoulders of the user who mounts the backrest device is more effectively distributed to both sides of the backboard 100 than the backrest device according to the first embodiment.

The backrest device according to the second embodiment includes a rotation guide device that guides the rotation of the shoulder strap support 130 and controls the rotation angle of the support 130; a rotation angle control device that controls the rotation angle of the waist protector 120; and the back plate 100 A lifting assembly that moves the waist protector 120 vertically while making the waist protector 120 slide on the back plate 100.

Hereinafter, the rotation guide device, the rotation angle control device, and the lifting assembly will be described in detail with reference to the accompanying drawings.

First, as shown in FIG. 10, the rotation guide device includes longitudinal guide holes 562 on both sides of each of the longitudinal rectangular plate 132 of the shoulder strap support 130 and the back plate 100. A rod-shaped protrusion with a flange passes through the longitudinal guide hole 562, and a plate-shaped or ring-shaped locking member is installed to the end of each rod-shaped protrusion with a flange. Thus, the flanged rod-shaped protrusion moves along the longitudinal guide hole 562 during the rotation of the shoulder strap support 130.

In the present invention, the protrusion and the locking member may respectively include a ring nut 565 and a washer-shaped cover 568 having a size larger than the guide hole 562, as shown in the figure. The ring nut 565 forms a flange at its rear end. The flange of the ring nut 565 is tightly placed on the back of the longitudinal rectangular plate 132 of the shoulder strap support 130. The washer-shaped cover 568 may be installed to the end of the ring nut 565 by welding or brazing. However, it is preferable to install the washer-shaped cover 568 to the end of the ring nut 565 using a locking screw 596 as shown in the figure. In the above-mentioned case, the locking screw 569 passes through the washer-shaped cover 568 and is fastened to the internal thread formed on the inner surface of the ring nut 565.

Alternatively, as shown in the figure, the protrusion and the locking member may include a pinned bolt 565' and a nut 568', respectively. The pin bolt 565' is closely placed on the back of the longitudinal rectangular plate 132 of the shoulder strap support 130, and the nut 568' is fastened to an external thread formed around the end of the pin bolt 565'.

As a further option, the protrusion and the locking member may respectively include a pin having a flange at the rear end in the same manner as the ring nut 568 (not shown in the figure) and a snap ring (not shown in the figure) mounted to the end of the pin. Not shown). In the above case, a fitting groove must be formed around the circumferential outer surface of the end of each pin to hold the snap ring on the pin.

When the rotation guide device includes a pin bolt 565' and a nut 568' as described above, or a flanged pin (not shown in the figure) and a snap ring (not shown in the figure), it can be omitted to pass through the washer-like cover The locking screw 569 of 568, thus, reduces the number of steps in the process of producing the backpack and reduces the manufacturing cost of the backpack.

In the following description, a backrest device according to the second embodiment will be described, in which a rotation guide device including a ring nut 565 and a washer-shaped cover 568 is mounted to the ring nut using a locking screw 569. Thus, the front end of the ring nut 565 is held on the shoulder strap support 130 by the washer-like cover 568, and the rear end of the nut 565 is held on the back plate 100 by the flange.

Therefore, during the rotation of the plate support 130 around the hinge shaft 250, the ring nut 565 moves along the longitudinal guide hole 562. In the above case, the length of the guide hole 562 determines the moving range of the ring nut 565 in the guide hole 562.

As shown in FIGS. 13 and 14, the longitudinal guide hole 562 is designed to form a circular arc having the center of the hinge shaft 250, and the arcs θ and α are preferably set to 3°-28° around the center of the hinge shaft 250.

In particular, the arc θ of the longitudinal guide hole 562 formed on the back plate 100 is preferably set to 22°-28°, and the arc α of the longitudinal guide hole 562 formed on the shoulder strap support 130 is preferably set to 3° ~13°.

In the second embodiment of the present invention, the arc θ of the longitudinal guide hole 562 formed on the back plate 100 and the arc α of the longitudinal guide hole 562 formed on the shoulder strap support 130 are respectively set to 22° and 4°. When the arcs θ and α are set to the above-mentioned values, the ring nut 565 can move along the guide hole 562 of the back plate 100 within the allowable range of an arc of 22°, and also move along the guide hole 562 of the shoulder strap support 130 in the arc. Move within another range allowed by 4°. Thus, the ring nut 565 can move within the allowable range of the total arc of 26°.

Considering that the above-mentioned angle is most suitable for allowing the user's shoulder to move smoothly, an angular range of 26° for the movement of the ring nut 565 is determined.

As described above, the longitudinal guide hole 562 of the rotation guide device is formed on the end of the longitudinal rectangular plate 132 of the shoulder strap support 130, and the ring nut 565 is placed separately from the waist protector 120. Therefore, the advantage of the backrest device according to the second embodiment is that even when the shoulder strap is stretched on the user's shoulder, the end of the longitudinal rectangular plate 132 of the shoulder strap support 130 will not be twisted.

The backing device that can prevent the end of the longitudinal rectangular plate 132 from being twisted is designed as follows: First, the ring nut 565 is separated from the waist protector 120 so that the ring nut 565 does not restrict the longitudinal rectangular plate 132.

Secondly, since the rotation guide device including the longitudinal guide hole 562 and the ring nut 565 is provided on both ends of the plate 132, the flange of the ring nut 565 stably supports the end of the plate 132.

Furthermore, the reinforcing plate 500 is preferably installed to both ends of the longitudinal rectangular plate 132 of the shoulder strap support 130 as shown in FIG. 14. Thus, the reinforcing plate 500 strengthens the strength of the guide hole 562 of the rectangular plate 132 as shown in the figure.

The reinforcing plate 500 is connected to the end of the longitudinal rectangular plate 132 and overlaps the area surrounding the guide hole 562. Of course, a longitudinal hole corresponding to the longitudinal guide hole 562 must be formed on each of the reinforcing plate 500 to allow the ring nut 565 to pass through the reinforcing plate 500.

When the reinforcing plate 500 is connected to the end of the longitudinal rectangular plate 132 as described above, the plate 132 can reliably resist the external force applied by the shoulder strap 30. Thus, the longitudinal rectangular plate 132 also effectively avoids distortion.

The rotation angle control device includes a hinge shaft cover 255 and an inclined protrusion 610. The hinge shaft cover 255 is rectangular and is mounted to the end of the hinge shaft 250 to form an integral structure so as to rotate together with the hinge shaft 250, as shown in FIGS. 12 and 13 , And the inclined protrusion 610 is formed on the back plate 100 on the opposite side of the hinge shaft cover 255 to stop the cover 255 during the rotation of the cover 255, so that the waist protector 120 is within the angle range determined by the inclination angle γ of the protrusion 610 Rotate. In other words, the inclination angle γ of the protrusion 610 is equal to the rotation angle of the waist protector 120 and the rotation angle of the hinge shaft 250. The hinge inclination angle γ of the protrusion 610 is as shown in FIG. 20.

As shown in the figure, the inclined protrusion 610 is formed on the opposite side of the hinge shaft passing hole 250 a provided on the back plate 100 and is triangular in shape, and the apex of the triangular protrusion 610 is in electrical contact with the opposite side of the hinge shaft cover 255.

Of course, the inclined protrusion 610 may be formed at the upper and lower parts of the hinge shaft passing hole 250a different from the structure shown in the figure. In the above situation, the rectangular hinge shaft cover 255 must be designed such that its horizontal axis is different from the structure shown in the figure but defines a longer axis.

The hinge shaft cover 255 is designed to rotate around the hinge shaft 250 through the protrusion 610 at an inclination of 25° to 42°, preferably at an angle of 30°. In order to realize the above-mentioned rotation angle of the cover 255, the inclination angle of the protrusion 610 must be specifically designed in consideration of the desired rotation angle of the cover 255.

Since the hinge shaft cover 255 and the inclined protrusion 610 are designed as described above, the rotation angle of the hinge shaft 250 is limited to 30°. Thus, during the rotation of the hinge shaft 250, the hinge shaft cover 255 rotates at 30°. When the hinge shaft cover 255 has been rotated at 30°, the inclined surface of the protrusion 610 stops the opposite side of the hinge shaft cover 255, thereby stopping the rotation of the cover 255. Therefore, the hinge shaft 250 only rotates within an angle range of 30°.

The rotation angle of the waist protector 120 is determined by the rotation angle of the hinge shaft 250. In other words, the waist protector 120 rotates around the hinge axis 250 at 30°. The 30° rotation angle of the waist protector 120 is determined in consideration of the movement of the user's waist. Since the waist protector 120 can rotate at 30° around the hinge axis 250, the user who installs the backrest device of the present invention on his back will not feel uncomfortable when moving his body.

The lifting assembly includes a cover-shaped guide boss 710 protruding forward to define a space therein, a lifting guide 720, a guide protrusion 722, and a lock 742, as shown in FIGS. 15 to 18. The lifting assembly having the above structure is placed between the hinge shaft 250 of the rotating unit and the waist protector 120, as shown in the figure.

The configuration of the lifting assembly will be described in detail below with reference to FIG. 17. First, the guide boss 710 protrudes from the waist protector 120 and faces the hinge shaft 250, and a longitudinal vertical slot 712 is formed on the front face of the boss 710. In the present invention, the guide boss 710 is preferably formed on the support panel 126 placed in the flame-retardant cover 122 of the waist protector 120.

During the injection molding process of producing the support panel 26, the guide boss 710 may be integrally formed with the support panel 26 to form an integral structure. Alternatively, the guide boss 710 may be formed separately from the support panel 26 before being installed to the support panel 126 by screw connection or riveting. The formation of the guide boss is well known to those skilled in the art, so it is believed that further description is unnecessary. The guide boss 710 moves vertically together with the waist protector 120 during the vertical movement of the waist protector 120.

The lifting guide 720 has a size larger than the width of the vertical slot 712 formed on the guide boss 710 and is closely placed on the back of the guide boss 710 as shown in the figure.

The guide protrusion 722 protrudes forward from the center of the lifting guide 720 as shown in the figure. The guide protrusion 722 passes through the vertical slot 712 of the guide boss 710 and is connected to the hinge shaft 250 at its end. Thus, when the waist protector 120 and the guide boss 710 move vertically, the guide protrusion 722 engaged with the vertical slot 712 guides the vertical movement of the guide boss 710.

In the present invention, the lifting guide 720 may be replaced by a flange of the guide protrusion 722. In this case, the flange of the guide protrusion 722 is closely placed on the back surface of the guide boss 710. The flange of the guide protrusion 722 may have various shapes, such as a circle or a rectangle.

In the present invention, the guide protrusion 722 of the lifting guide 720 and the hinge shaft 250 are preferably connected to each other by a spline connection. In order to realize the spline connection, the rear end surface of the hinge shaft 250 is formed with a groove 722' as shown in FIG. 17, and the hinge shaft 250 is connected to the groove 722' of the guide protrusion 722 through a spline connection. Therefore, the hinge shaft 250 is prevented from sliding on the end of the guide protrusion 722. In the above case, the groove 722' must have a shape corresponding to the end of the guide protrusion 722.

The locking member 724 may include a longitudinal locking screw as shown in the figure. The locking piece 724 sequentially passes through the lifting guide 720 and the guiding protrusion 722 before being screwed into the hinge shaft 250, thereby integrally forming the hinge shaft 250 and the guiding protrusion 722 into a single structure. The lock piece 724 installs the guide protrusion 722 to the rotation unit. The connection state of the guide boss 710, the lifting guide 720, and the locking member 724 is shown in detail in FIG. 16.

As shown in the figure, the guide boss 710 preferably has a circular shape R on its front. Thus, during the vertical movement of the waist protector 120, the guide boss 710 moves vertically with respect to the guide protrusion 722 of the lifting guide 720, while forming a curved track caused by the circular R of the front surface. When the guide boss 710 is configured to move vertically while forming a curved track caused by the circular shape R of the front surface as described above, the waist protector 120 can move smoothly. In the above state, the guide boss 710 is guided by the guide protrusion 722 passing through the vertical slot 712 during the vertical movement.

The lifting assembly may further include a tilting device that tilts the waist protector 120 during forward and backward movement of the waist protector 120.

The tilting device includes a lifting guide 720 having an inclined surface to define a triangular cross-section as shown in FIGS. 16 to 18, and a guide ring 740 having a triangular cross-section corresponding to the lifting guide 720 and fitting in the lifting The guide protrusion 722 of the guide 720 is simultaneously placed closely on the circular front surface of the guide boss 710, so that the lifting guide 720 and the guide ring 740 perform up and down movement while being supported and guided by their inclined projections. Boss 710. The up and down movement of the lifting guide 720 and the guide ring 740 is shown in detail in FIG. 16.

In the present invention, the guide protrusion 722 of the lifting guide 720 must be lengthened to provide a sufficient length to allow the ring 740 to be effectively fitted on the protrusion 722. That is, the guide protrusion 722 must increase the thickness of the ring 740. If the lifting assembly is configured without the above-mentioned tilting device, the guide ring 740 can be omitted, thereby reducing the length of the guide protrusion 722.

In addition to the above-mentioned tilting device, the lifting assembly may also include an anti-friction member 760, as shown in FIGS. 16 to 18.

The anti-friction member 760 is placed between the guide boss 710 and the lifting guide 720 to prevent the guide boss 710 from directly contacting the lifting guide 720. In order to achieve the above purpose, the anti-friction member 760 is preferably designed to have an annular appearance as shown in FIG. 17. In this embodiment, the anti-friction member 760 is fitted on the guide protrusion 722 at a position between the guide boss 710 and the lifting guide 720.

In addition, the anti-friction member 760 is preferably formed in the shape of a curved section as shown in the figure, so as to elastically support the lifting guide 720 with respect to the guide boss 710. In other words, the anti-friction member 760 may include a leaf spring having annular ridges and grooves.

When the anti-friction member 760 is designed in the form of a leaf spring having annular ridges and grooves as described above, the anti-friction member 760 utilizes its recovery while the waist protector 120 moves forward and backward while the guide 720 moves up and down. The force will elastically return the lifting guide 720 to its original position. The enlarged view in FIG. 16 shows the anti-friction member 760. When the upper portion of the lifting guide 720 has moved downward, the lower portion of the anti-friction member 760 is in a compressed state, and the remaining views show the anti-friction member 760. The restoring force of the piece 760 returns to its initial position of the lifting guide 720.

At the same time, as shown in FIG. 18, the longitudinal rectangular plate 132 of the shoulder strap support 130 and the anti-friction member 300 are sequentially fitted on the hinge shaft 250, and the hinge shaft 250 is installed by the locking member 724 to the guide protrusion of the lifting guide 720 From 722. In addition, the hinge shaft 250 passes through the hinge shaft penetration hole 250 a of the back plate 100 and is connected to the hinge shaft cover 255 by a locking screw 290.

It is easier to understand the operation of the lifting assembly and the tilting device of the present invention from the following description in conjunction with FIG. 16 and FIG. 18.

The operation of the lifting assembly and the tilting device will be described below with reference to FIG. 16. As shown in the figure, when the waist protector 120 rotates in response to the movement of the user's body, the hinge shaft 250 rotates with the waist protector 120 around its central axis (circular motion).

When the waist protector 120 moves up and down, the guide boss 710 moves in the same direction under the guidance of the guide boss 722 of the rising guide 720 engaged with the vertical slot 712 of the guide boss 710.

Meanwhile, when the protector 120 moves forward and backward, the lifting guide 720 and the ring 740 perform up and down movement to tilt the waist protector 120 forward and backward. In the above state, the anti-friction member 760 is compressed to generate elastic restoring force. Thereby, when the inclined waist protector 120 returns to its original position, the anti-friction member 120 is elastically biased to the lifting guide 720 by the restoring force, thereby returning the lifting guide 720 to its original position.

When the user who mounts the backrest device according to the second embodiment on his back moves his shoulders, the shoulder strap support 130 rotates around the hinge axis 250 due to the tightened shoulder strap 30 as shown in FIG. 19. In the above state, the rotation angle of the shoulder strap support 130 is restricted by the longitudinal guide hole 562 formed on the longitudinal rectangular plate 132 and the back plate 100 and the ring nut 565 moving along the guide hole 562.

At the same time, when the user of the backpack bends the body to the left or right, the waist protector 120 rotates around the hinge shaft 250 as shown in FIG. 20. In the above state, the rotation angle γ of the hinge shaft 250 is restricted by the rectangular hinge shaft cover 255 mounted to the end of the hinge shaft 250 and the inclined protrusion 610 formed on the opposite side of the hinge shaft passing hole 250a of the back plate 100 To 30°. Of course, the waist protector 120 rotates at the same rotation angle as the angle γ of the hinge shaft 250 in the above-mentioned state.

In addition, when the user of the backpack bends the body forward, the waist protector 120 moves vertically while tilting upward or downward as shown in FIGS. 21 and 22. During the vertical movement of the waist protector 120, the guide boss 710 moves in the same direction while being guided by the guide protrusion 722 of the lifting guide 720. When the waist protector 120 is inclined upward or downward, the lifting guide 720 and the ring 740 perform up and down movement while compressing or stretching the anti-friction member 760. During the vertical movement together with the upward and downward tilting movement of the waist protector 120, the anti-friction member 760 is the lifting guide 720 and the guide boss 710 from friction.

The structures according to the first and second embodiments of the present invention can be used for traditional backpacks, rather than only for backpacks with characteristic functions. When the present invention is applied to a conventional backpack, the back plate 100 can be used as the back of the backpack. It should be understood that the present invention is not limited to a knapsack device specifically used for back-mounted compressed air cylinders.

Although the preferred embodiments of the present invention are disclosed for illustrative purposes, those skilled in the art will understand that various modifications, additions, and substitutions can be made within the scope and spirit of the present invention.

Therefore, the elements, shapes, and structures shown in the embodiments of the present invention may be modified without departing from the scope and spirit defined by the claims of the present invention.

Industrial Applicability As described above, the present invention provides a backrest device whose waist belt and shoulder strap move independently of the backboard, thus preventing the center of gravity of the compressed air cylinder fastened to the backboard from accidentally shifting. In addition, since the waist belt and the belt move separately, the backrest device allows a user who has the backrest device installed on his back to easily move his body.

In addition, when the ring nut is separately installed in the back plate from the waist protector, the longitudinal guide hole is formed on the end of the longitudinal rectangular plate of the shoulder strap support, thereby preventing the end of the longitudinal rectangular plate from being twisted. Since the end of the longitudinal rectangular plate is spaced from the waist protector to stably maintain the tensioned state of the belt, the user can comfortably install the backrest device on his back.

In addition, since the waist protector of the back leaning device rotates around the hinge shaft and moves upward, downward, forward, and backward through the guide boss, the guide protrusion of the lifting guide, and the ring, the user installs the back on the back At the same time, it is more comfortable to install the back leaning device on the back and to move the body more easily.

Another advantage of the present invention is that the protective plate provided at the lower end of the back plate is formed in a plate shape capable of preventing the protective plate from being caught on the protruding object. In addition, the protective plate can be formed as a single structure integrated with the back plate during the process of producing the back plate, thus reducing the time required to produce the back plate. Since the battery box in which the battery is held is arranged in front of the back plate, the user can easily, quickly and conveniently replace the battery with a new battery.