Back ring of satchel

The present invention relates to a back ring for connecting a backpack belt to a school bag body.

Patent Document 1 describes a base that is attached to the back support portion of the school bag body, a swing arm that is swingably supported by the base and one end side of the backpack belt of the school bag is connected to the upper end portion, and a swing arm. A back ring of a school bag provided with a rubber-like elastic body that is compressed by outward swing and urges the swing arm inward is disclosed.

<p><patcit num="1"><text>Utility Model Registration No. 3203042</text></patcit></p>

<p> By the way, the back ring of Patent Document 1 obtains a repulsive force by compressing and deforming a rubber-like elastic body, and is more durable than a metal leaf spring that obtains a repulsive force by elastic bending of a material. Is excellent.</p><p> However, since compressive deformation is deformation while maintaining the volume, the amount that can be deformed is naturally limited. In addition, since the repulsive force increases sharply (the spring constant is large) with a slight deformation compared to the bending deformation, there is a large difference in the repulsive force between the beginning and the end of the swing range (movable range) of the swing arm. Was there.</p><p> Therefore, an object of the present invention is to provide a back ring having a wide movable range of the swing arm, a stable repulsive force, and excellent durability.</p>

<p> The back ring of the school bag of the present invention is oscillatingly supported by the base 2 attached to the back support portion 10a of the school bag main body 10 and the base 2, and one end side of the backpack belt 11 of the school bag is connected to the upper end portion. It has a pair of left and right swing arms 3 and a plate-like shape, is arranged between the bases 3a of the pair of left and right swing arms 3, and elastically deforms and swings due to the swing of the swing arms 3. It is characterized by having a rubber-like elastic body 4 that repels.</p><p> Here, "repulsive" means that the rubber-like elastic body 4 is deformed to allow the swing arm 3 to swing, but to return to the original shape of the rubber-like elastic body 4 itself. It refers to urging the swing arm 3 toward its original position before swinging due to its resilience (elasticity).</p><p> In such a back ring, it is preferable that the rubber-like elastic bodies 4 are composed of a pair of left and right elastic bodies and are arranged with a gap 4f. Further, it is preferable that the elastic deformation of the rubber-like elastic body 4 includes bending or bending in the thickness direction regulated by the inner wall surface of the substrate 2. Further, the substrate 2 is composed of a substrate 21 and a lid material 22 attached to the front surface of the substrate 21, and the rubber-like elastic body 4 is passed between the substrate 21 and the lid material 22. Those supported by the support shaft 22a penetrating 4 are preferable.</p><p> Further, it is preferable that the substrate 2 has a rising 22b at the edge portion, and the lower end of the rubber-like elastic body 4 is in contact with the inner surface of the rising 22b. Further, it is preferable that the substrate 2 includes an intermediate rising piece 22j passed between the substrate 21 and the lid member 22, and the upper end of the rubber-like elastic body 4 is in contact with the lower surface of the intermediate rising piece 22j.</p><p> The swing arm 3 includes a disk-shaped base portion 3a centered on the swing center and a contact portion 3d protruding outward in the radial direction from the base portion 3a, and the rubber-like elastic body 4 is formed by a rubber-like elastic body 4. It is preferable that the concave arc portion 4c along the outer peripheral surface of the base portion 3a and the convex arc portion 4d bulging toward the contact portion 3d are provided.</p><p> Further, in any of the above cases, it is preferable that the rubber-like elastic body 4 is made of silicone-based rubber.</p>

<p> In the back ring of the school bag of the present invention, the swing arm connected to the upper end of the backpack belt swings left and right, so that it expands elastically when carrying the school bag on the back and closes elastically after carrying the school bag. It is easy to remove it. In addition, it fits the size of the back even if the user grows up. Since a plate-shaped rubber-like elastic body is used as the elastic body for returning the expanded swing arm, elastic deformation can be carried out in a wide range, and partial deformation is suppressed. Therefore, the rubber-like elastic body is not easily damaged even if it is repeatedly deformed, and its durability is high.</p><p> When the rubber-like elastic bodies are composed of a pair on the left and right and are arranged with a gap, when the rubber-like elastic bodies are pressed toward the center by the swing arm and deformed, they escape to the gap portion. be able to. Therefore, the repulsive force due to the elastic deformation gently increases, and the user feels comfortable wearing the shoulder belt. If the elastic deformation of the rubber-like elastic body includes bending or bending in the thickness direction restricted to a predetermined range by the inner wall surface of the substrate, excessive partial deformation is further suppressed. , The repulsive force becomes gentle, and the backpacking operation and the removing operation of the backpacking belt become easier. The substrate is composed of a substrate and a lid material attached to the front surface of the substrate, and the rubber-like elastic body is supported by a support shaft passing through the rubber-like elastic body passed between the substrate and the lid material. If this is the case, the assembly work is easy, and the elastically deformed rubber-like elastic body becomes stable.</p><p> When the substrate has a rising edge, and the lower end of the rubber-like elastic body is in contact with the inner surface of the rising surface, the posture of the rubber-like elastic body during assembly and after elastic deformation is stable. Further, if the substrate is provided with an intermediate rising piece passed between the substrate and the lid material, and the upper end of the rubber-like elastic body is in contact with the lower surface of the intermediate rising body, the rubber-like elastic body is deformed. The posture is stable.</p><p> The swing arm includes a disk-shaped base centered on the swing center and a contact portion protruding outward in the radial direction from the base, and the rubber-like elastic body is formed on the outer peripheral surface of the base. If a concave arc portion along the line and a convex arc portion that bulges toward the contact portion are provided, the necessary contact is ensured while avoiding unnecessary interference between the swing arm and the rubber-like elastic body. , Sufficient repulsive force can be exerted from the initial stage of rocking. Therefore, a stable repulsive force can be obtained over the entire swing range.</p><p> Further, if the rubber-like elastic body is made of silicone-based rubber, it has excellent weather resistance and can exhibit a stable repulsive force for a long period of time.</p>

<figref num="1">It is an exploded perspective view which shows the back ring of the school bag which concerns on one Embodiment of this invention.</figref><figref num="2">The details of the substrate are shown, (a) is a front view of the inner surface side thereof, and (b) is a side view.</figref><figref num="3">The details of the lid material are shown, (a) is a front view of the inner surface of the lid material, (b) is a sectional view taken along line III-III of (a), and (c) is a swing lever and a rubber-like elastic body. It is a front view of the inner side surface of the lid material shown.</figref><figref num="4">The details of the swing arm are shown, (a) is a front view and (b) is a right side view.</figref><figref num="5">The details of the rubber-like elastic body are shown, (a) is a front view, (b) is a right side view, (c) is a plan view, and (d) is a bottom view.</figref><figref num="6">The contact state between the swing arm and the rubber-like elastic body is shown. (A) is a front view before swing, (b) is a VIb-VIb line sectional view of (a), (c), (d). Is a sectional view taken along line VIc-VIc in (a) before and after the swing.</figref><figref num="7">It is a front view which shows the other embodiment of a rubber-like elastic body.</figref><figref num="8">It is a front view which shows the attachment state of the back ring to the school bag.</figref>

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the back ring 1 of the school bag according to the embodiment of the present invention. As shown in FIG. 8, the back ring 1 is oscillatingly supported by the base 2 attached to the back support portion 10a of the school bag main body 10 and the base 2, and one end side of the backpack belt 11 is connected to the upper end portion. It is provided with a pair of left and right swing arms 3 and 3 and a pair of left and right rubber-like elastic bodies 4 and 4 housed in the base 2 and repelling the swing of the swing arm 3. The upper end of the swing arm 3 and one end side of the backpack belt 11 are connected via a mounting ring 5. A hanging ring 6 for hooking the school bag body 10 to a hook or the like is attached to the base 2. In FIG. 8, reference numeral 7 is a cover that covers the upper portion of the substrate 2.

As shown in FIG. 1, the substrate 2 is composed of a plate-shaped substrate 21 located on the back support portion 10a side of the school bag main body 10 and a shallow box-shaped lid member 22 covering the substrate 21. By attaching the lid material 22 to the substrate 21, a thin box-shaped substrate 2 can be obtained. The base 2 is a case for accommodating and supporting the lower parts of the swing arms 3 and 3 and the rubber-like elastic bodies 4 and 4.

As shown in FIGS. 2a and 2b, the substrate 21 is a flat plate made of synthetic resin that is symmetrical, has an arc shape whose upper end is convex upward, and has a substantially U-shaped contour from the left and right side surfaces to the lower surface. A pair of left and right fitting pins 21a that fit into the holes of the support shaft 22a (see FIG. 3b) projecting from the lid member 22 are projected from the lower portion of the substrate 21.

Further, the substrate 21 is provided with a shaft portion 21b for swingably supporting the swing arm 3 above. The shaft portion 21b has a cylindrical shape so that a fitting protrusion 22d (see FIG. 3a) protruding from the lid member 22 can be fitted into the central through hole. Further, screw holes 21c and 21d through which screws for attaching the base 11 to the school bag body are passed are provided in the central portion and both end portions of the substrate 21. The periphery of the screw holes 21d at both ends protrudes forward in a cylindrical shape in order to be fitted and positioned in the holes of the protruding portions 22k (see FIGS. 3a and 3b) of the lid material 22 described later. The vicinity of the screw hole 21d projects to the left and right from the side edge of the base 2 in order to widen the space S inside the base 2 (see FIG. 6c).

As shown in FIGS. 3a and 3b, the lid material 22 has a substantially arcuate upper end and a substantially U-shape from the left and right side surfaces to the lower surface, and has substantially the same contour shape as the substrate 21. However, the edge of the lid material 22 is raised (rising 22b), and as shown in FIG. 3c, when the lid material 22 is attached to the substrate 21, the swing arm 3 and the rubber-like elastic body 4 are placed between the substrate 21 and the lid material 22. A space S capable of accommodating the hanging ring 6 is formed. Further, as shown in FIG. 3b, the lower part of the front surface of the lid material 22 is retracted while being gently curved. Therefore, the depth of the space S becomes shallower and the thickness of the substrate 2 becomes thinner toward the lower side. As a result, when attached to the school bag body 10 as shown in FIG. 8, the level difference with the backrest portion 10a is reduced, and the leather C for cosmetics can be smoothly covered.

Since the rising 22b of the edge portion projects the swing arm 3 pivotally supported by the shaft portion 21b of the substrate 21 upward, the portions that serve as the range of motion of the left and right swing arms 3 are cut out, respectively ( Notch 22c). Therefore, when the substrate 21 and the lid material 22 are combined, slit-shaped openings are formed above the left and right sides of the substrate 2. Further, a protruding piece is formed between the cutout portions 22c, and the protruding piece is provided with a shallow groove that guides the lower portion (U-shaped portion 6a) of the hanging ring 6 so as to be vertically movable.

Further, as described above, the lid material 22 is provided with a fitting projection 22d that fits into the through hole of the shaft portion 21b of the substrate 21. The fitting projection 22d has a tubular shape, and the through hole 22e at the center thereof is a hole through which a rivet for fixing the substrate 21 and the lid material 22 is passed. On the inner surface of the lid member 22, an arcuate or annular rib 22f is projected so as to surround the fitting protrusion 22d. The rib 22f is a portion that is in sliding contact with the base portion 3a of the swing arm 3, which will be described later, and forms a smooth sliding surface with high accuracy to bring about smooth swing. The annular rib 22f and the fitting protrusion 22d are connected by a cross-shaped rib 22l.

Further, two support shafts 22a for supporting the pair of rubber-like elastic bodies 4 and 4 described above project from the center of the lid member 22 in the width direction. As shown in FIG. 3c, each of these support shafts 22a is inserted into the through hole 4f of the rubber-like elastic body 4 to support the rubber-like elastic body 4. The fitting pin 21a of the support shaft 22a and the substrate 21 also functions to position the substrate 21 and the lid member 22.

Further, as shown in FIG. 3a, screw holes 22g and 22h are provided in the central portion and both ends of the lid material 22 at locations facing the screw holes 21c and 21d of the substrate 21 when they are overlapped with the substrate 21. Has been done. Since the screw hole 22g in the center is also used for attaching the hanging ring 6, a reinforcing rib 22i for ensuring strength is provided on the outer periphery thereof. The reinforcing rib 22i is long in the vertical direction, and in this embodiment, the lower end is an intermediate rising piece 22j that abuts on the upper end edges 4a of the rubber-like elastic bodies 4 and 4, and determines the position of the rubber-like elastic body 4 and elastically deforms upward. It has a function to regulate. Cylindrical protrusions 22k that can counter the screw tightening force are provided on the outer periphery of the screw holes 22h at the left and right ends of the lid material 22 in order to secure a space from the substrate 21. The protruding portion 22k is integrated with the rising portion 22b, and a hole for fitting with the protruding portion around the screw hole 21d of the substrate 21 is formed.

As shown in FIGS. 1 and 4a and 4b, the swing arm 3 has a disk-shaped base portion 3a, a plate-shaped connecting portion 3b extending forward and upward from the base portion 3a, and a lateral direction at the upper end thereof. It is composed of a pipe-shaped mounting portion 3c for mounting the mounting ring 5 extending to the base portion 3a and a plate-shaped contact portion 3d protruding downward from the base portion 3a and contacting the rubber-like elastic body 4. At the center of the base portion 3a, a shaft hole 3e for swingably supporting the swing arm 3 to the shaft portion 21b of the substrate 21 is provided.

As shown in FIG. 4b, the mounting portion 3c at the upper end of the swing arm 3 is provided with a mounting hole 3g for inserting the end portion of the mounting ring 5. As shown in FIG. 1, in this embodiment, the ends 5a and 5a of the mounting ring 5 are flattened so that the mounting ring 5 does not rotate in the mounting hole 3g, and the mounting hole 3g is a flat rectangle. It has a cross-sectional shape of the shape. A metal pipe may be embedded inside the mounting hole 3g to increase the mounting strength.

The rubber-like elastic bodies (rubber plates) 4 and 4 are plate-shaped, and as shown in FIGS. 1 and 5a to 5d, the upper end edge 4a is straight and straight downward from the inner (center side) end. The inner edge 4b extends to. On the other hand, a concave arc portion 4c that is in sliding contact with the periphery of the disk-shaped base portion 3a of the swing arm 3 is formed in the inclined portion extending diagonally downward from the outer end portion of the upper end edge 4a. In addition, a convex arc portion 4d that bulges in an arc shape is formed at the outer end of the lower portion, and the lower end edge 4e is a gentle convex curved surface that abuts on the inner surface of the rising 22b at the lower end of the lid material 22. It is said that. Therefore, each rubber-like elastic body 4 has a so-called shoe or sock shape. The left and right rubber-like elastic bodies 4 and 4 have a gap 4f in the center as a whole, but the upper part is substantially trapezoidal and the lower part is oval or elliptical with long left and right, and Mt. Fuji or aliens as a whole. It becomes the form of the face. Further, a through hole 4g for mounting is formed in the central portion of each of the rubber-like elastic bodies 4 and 4 to be fitted with the support shaft 22a of the lid member 22.

In this rubber-like elastic body 4, as shown in FIG. 3c, the upper end edge 4a abuts on the lower surface of the intermediate rising piece 22j of the lid material 22 and the lower end edge 4e is the rising edge 22b of the lower end of the lid material 22. The through hole 4g is fitted so as to fit on the outer circumference of the support shaft 22a. As a result, the left and right rubber-like elastic bodies 4 and 4 are arranged with a gap 4f between them. When the inner surface of the lid material 22 is slightly curved as shown in FIG. 3b, the rubber-like elastic body 4 is curved along the inner surface (see FIG. 6b). Then, the lid material 22 is attached to the substrate 21 to which the swing arm 3 is attached. As a result, as shown in FIG. 6a, the convex arc portion 4d of the rubber-like elastic body 4 comes into contact with the side surface of the contact portion 3d of the swing arm 3. At this time, the concave arc portion 4c abuts on the outer circumference of the base portion 3a of the swing arm 3 or faces the outer circumference via a gap. As shown in FIG. 6b, the thickness of the rubber-like elastic body 4 is somewhat thinner than the depth (front-back dimension) of the space S in the substrate 2. Therefore, as shown in FIG. 6c, a gap G is formed between the inner surface of the substrate 21 and the surface of the rubber-like elastic body 4. The thickness of the rubber-like elastic body 4 is preferably about 2 to 5 mm, and the gap G is preferably about 0.5 to 3 mm.

As the material of the rubber-like elastic body 4, for example, synthetic rubber such as silicone rubber, urethane rubber, polyolefin rubber, and elastomer can be used, or natural rubber can be used, but silicone rubber having excellent weather resistance can be used. preferable. As a manufacturing method, for example, a rubber sheet made of the above material is punched into a predetermined shape such as a shoe shape, or the rubber material is poured into a mold and baked or vulcanized. In the latter case, the thickness can be partially changed or the shape can be made three-dimensional.

As shown in FIG. 1, the mounting ring 5 is formed by bending a metal wire into a trapezoidal shape or a triangular shape. A gap narrower than the axial length of the mounting portion 3b is provided between both ends 5a and 5a of the wire rod. Then, these both end portions 5a and 5a are inserted into the mounting holes 3e and bent and deformed so that the apex angle becomes narrow, so that they can be mounted on the swing arm 3. It is preferable that the mounting ring 5 is mounted in a state where the rotation is restricted with respect to the swing arm 3, but the mounting rings 5 may be rotatably mounted with the ends 5a and 5a as rotation axes.

As shown in FIG. 1, the hanging ring 6 is formed by bending a metal wire into a substantially bottle opener shape. The hanging ring 6 is fixed so as to be slidable in the vertical direction with respect to the substrate 2 by inserting a screw (screw hole 21c, a screw penetrating the screw hole 22g) into the U-shaped portion 6a extending downward. Will be done. At the descending end, it is supported by the intermediate rising piece 22j, and excessive downward movement is restricted.

The back ring 1 having the above configuration is as shown in FIG. 6d when the swing arm 3 is swung outward (in the direction in which the upper ends of the pair of swing arms 3 and 3 are separated from each other) from the states shown in FIGS. 6a and 6b. The abutting portion 3d swings inward (the direction in which the abutting portions 3c are close to each other), and the rubber-like elastic bodies 4 and 4 are pressed inward. Then, the convex arc portion 4c at the end of the rubber-like elastic body 4 is deformed so as to be pushed toward the center side. At this time, since the rubber-like elastic body 4 is plate-shaped and thinner than the thickness of the space S in the substrate 2, it bends or bends and escapes. Then, when it comes into contact with the inner surface of the substrate 2, further deformation is suppressed. Therefore, as shown in FIG. 6d, the tip is deformed in the thickness direction so as to be somewhat wavy in a plan view.

As described above, in the spine ring 1 of the present invention, since one rubber-like elastic body 4 is arranged in the substrate 2 along the inner surface thereof, the volume is large and the elastic energy that can be stored inside is large. Further, while the compression deformation is the basis, the bending deformation due to the waviness also occurs at the same time, so that an appropriate repulsive force can be obtained. Further, even if the swing angle of the swing arm 3 becomes large, the repulsive force does not become excessively large, and a stable repulsive force can be obtained over the entire swing range. Further, since a gap 4f is provided between the left and right rubber-like elastic bodies 4 and 4, it is possible to escape to this gap as well. Therefore, the increase in the repulsive force with the increase in the pressing force is gentle, and the usability of the user is excellent.

The repulsive force of the rubber-like elastic body 4 deformed by the swing of the swing arm 3 acts on the contact portion 3d. Therefore, if the outward load on the swing arm 3 is removed, the swing arm 3 moves inward and returns to the basic position. At this time, the rubber-like elastic body 4 also returns to its original shape.

As described above, the back ring 1 of the present invention can obtain a sufficient repulsive force from the initial stage of the swing of the swing arm 3, and further suppresses a rapid increase in the repulsive force even at the final stage of the swing. Is smooth and comfortable to use. Further, since the contour of the rubber-like elastic body 4 is formed by a smooth curve and does not have a corner portion, stress concentration at the time of deformation can be avoided and the durability is excellent. Further, since the rubber-like elastic body 4 can be mounted in a natural shape and does not pop off like a leaf spring, it can be assembled easily and quickly.

Although the typical embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention.

For example, in the above embodiment, a pair of left and right rubber-like elastic bodies 4 and 4 are adopted, but as shown in FIG. 7, one rubber-like elastic body 4 in which the left and right are integrated can also be adopted. .. In that case, the installation work becomes easier. In addition, since one rubber-like elastic body is supported by two support shafts 22a (see FIG. 3c), the attached posture is stable. Further, in the above embodiment, a rubber-like elastic body 4 having a shoe shape on one side and a Mt. Fuji shape when the left and right sides are combined is used, but various shapes such as a rectangular shape and an oval shape are used within the range in which the above-mentioned effects can be obtained. May be adopted. Further, the thickness may be partially changed or the shape may be three-dimensional. By changing the shape in this way, the spring constant can be easily adjusted.

Further, the rubber-like elastic body 4 can be used by stacking a plurality of sheets of the same material or different materials. Further, a somewhat large rubber-like elastic body may be adopted to apply a preload to the rubber-like elastic body 4, and a repulsive force may be applied to the swing arm 3 before the swing. Further, although the lid material 22 is provided with a rising edge 22b, a rising edge may be provided on the substrate 21 side. Further, regarding the connection of the backpack belt 11 to the swing arm 3, the belt connecting portion may be integrally provided at the upper end of the swing arm 3 and directly connected without using the mounting ring 5.

1 Back ring of land cell 2 Base 21 Board 21a Fitting pin 21b Shaft 21c Screw hole (center) 21d Screw hole (end) 22 Lid material 22a . Support shaft 22b Rising 22c Notch 22d Fitting protrusion 22e Through hole 22f Arc-shaped rib 22g Screw hole (center part) 22h Screw hole (upper end) 22i Reinforcing rib 22j Intermediate rising piece 22k Protruding part 22l Cross-shaped rib 3 Swing arm 3a Base part 3b Connecting part 3c Mounting part 3d Contact part 3e . Shaft hole 3g Mounting hole 4 Rubber elastic body 4a Upper end edge 4b Inner end edge 4c Concave arc part 4d Convex arc part 4e Lower end edge 4f Gap 4g Through hole 4A Rubber elastic body 5 Mounting ring 5a End 6 Suspended ring 6a U-shaped part 7 Cover 10 Land cell body 10a Backrest 11 Belt S ... Space G ... Gap C ... Leather