Untitled record

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

As shown in FIGS. 6 and 7, the backpack belt 11 is attached to the backrest portion 10a of the school bag main body 10 via the back ring 100.

The back ring 100 is attached to the base 2 attached to the back support portion 10a of the school bag main body 10, a pair of left and right swing arms 3 and 3 swingably attached to the base 2, and the upper end portion 3a of the swing arm 3. It is provided with a mounting ring 5 that is mounted and to which one end side of the backpack belt 11 is connected. The back ring 100 is usually covered with a cover (not shown), and only the swing arm 3 projects to the outside. The other end side of the backpack belt 11 is connected to a mounting bracket (not shown) attached to the bottom 10b of the school bag body 10.

<p num="0004"><patcit num="1"><text>Jikkenhei 2-149509 Gazette</text></patcit><patcit num="2"><text>JP-A-2002-291511</text></patcit><patcit num="3"><text>Japanese Unexamined Patent Publication No. 2009-28401</text></patcit></p>

<p num="0005"> By the way, in the dorsal rings of Patent Documents 1 to 3, a pair of left and right swing arms are urged by springs in a direction (inside) close to each other. This arm urging spring is a so-called leaf spring or wirework spring in which a plate-shaped or linear spring steel material is curved in a V-shape or a U-shape, and is formed by elastic bending of the material. Since it is repulsive, it will reach the end of its life at a relatively early stage if repeated stress is applied.</p><p num="0006"> Further, when the spring is expanded and contracted, the end portion of the spring moves so as to rub against the surface of the swing arm, so that the swing arm may be worn and malfunction may occur.</p><p num="0007"> In addition, the springs are mounted in a somewhat compressed and deformed state so that the swing arm can still be urged when it returns to its basic position (so that the swing arm does not rattle), but assembled. It was not always easy to assemble, as the spring would pop off if it failed.</p><p num="0008"> Therefore, an object of the present invention is to provide a back ring having excellent durability and good assembleability.</p>

<p num="0009"> The back ring for 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. It is characterized by including a swing arm 3 and a columnar rubber-like elastic body 4 that repels the outward swing of the swing arm 3. Here, "repulsive" means that the rubber-like elastic body 4 is compressed and 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 means to urge the swing arm 3 toward the original position before swing by the resilience (elasticity).</p><p num="0010"> It is preferable that the rubber-like elastic body 4 is arranged so that the curved surface faces the outer surface of the swing arm 3 in the swing direction.</p><p num="0011"> It is preferable that the base 2 is formed with a fitting portion 22j for fitting the rubber-like elastic body 4.</p><p num="0012"> It is preferable that the inner dimension of the fitting portion 22j is smaller than the outer dimension of the rubber-like elastic body 4.</p><p num="0013"> It is preferable that the rubber-like elastic body 4 is made of silicone-based rubber.</p>

<p num="0014"> Since the back ring for the school bag of the present invention is provided with a rubber-like elastic body that repels the swing of the swing arm, it does not repel due to elastic bending of the material like a leaf spring, and is excellent in durability. In particular, since the rubber-like elastic body is columnar and has no corners, stress concentration during compression can be avoided, and a stable repulsive force can be obtained over a long period of time. In addition, there is no need to worry about the mounting direction when assembling, and since it does not pop off like a leaf spring, assembly can be performed easily and quickly.</p><p num="0015"> Further, if the rubber-like elastic body is arranged with the curved surface facing the outer surface in the swing direction of the swing arm, the rubber-like elastic body deformed by the swing of the swing arm returns to the original shape. Easy and stable repulsive force can be obtained.</p><p num="0016"> Further, if the substrate is formed with a fitting portion for fitting the rubber-like elastic body, the rubber-like elastic body can be easily attached to the substrate and the assembling property is improved.</p><p num="0017"> In particular, if the inner dimension of the fitting portion is smaller than the outer dimension of the rubber-like elastic body, when the rubber-like elastic body is fitted, it stays in the fitting portion due to its own repulsive force. It is not necessary to hold the elastic body by hand, which further improves the assembleability.</p><p num="0018"> Further, if the rubber-like elastic body is made of silicone-based rubber, it has excellent weather resistance and can stably exert a 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">It is a top view which shows the inner surface side of a substrate.</figref><figref num="3">It is a top view which shows the inner surface side of a lid material.</figref><figref num="4">The swing arm is shown, (a) is a front view, and (b) is a side view.</figref><figref num="5">It is a front view which shows the swing state of a swing arm.</figref><figref num="6">It is a front view which shows the attachment state of the back ring.</figref><figref num="7">It is a perspective view which shows the whole shape of a 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. The back ring 1 is a pair of left and right bases 2 attached to the backrest portion 10a (see FIG. 6a) of the school bag body, and a pair of left and right sides that are swingably supported by the base 2 and one end side of the backpack belt 11 is connected to the upper end portion. The swing arms 3 and 3 and the rubber-like elastic body 4 that repels the swing of the swing arm 3 are provided. The upper end of the swing arm 3 and one end side of the backpack belt 11 are connected via a mounting ring 5.

The substrate 2 is composed of a substrate 21 located on the back support portion 10a side of the school bag main body 10 and a lid material 22 for covering the substrate 21.

The substrate 21 has a flat plate shape, and as shown in FIGS. 1 and 2, the shape is symmetrical. A triangular protrusion 21a is provided at a portion closest to the center of the substrate 21. This is a regulating part that regulates the swing arm 3 from going too far inward (the direction in which the pair of swing arms 3 and 3 are close to each other). Further, adjacent to the protrusion 21a, a shaft portion 21b for pivotally supporting the swing arm 3 so as to swing in the direction of the arrow is provided. At the center of the shaft portion 21b, a hole 21c into which the fitting projection 22c of the lid material 22 described later can be fitted is provided. Further, screw holes 21d, 21e, and 21f are provided at the center and both ends, respectively. The other holes are lightening holes.

As shown in FIGS. 1 and 3, the lid material 22 has a flat plate shape with a raised edge, and its shape is symmetrical with respect to the substrate 21. The rising 22a of the edge portion causes the swing arm 3 pivotally supported by the shaft portion 21b of the substrate 21 to protrude outward (upward when attached to the back support portion 10a of the school bag body 10), so that the swing arm 3 It is not provided in the range of motion of. Therefore, when the substrate 21 and the lid material 22 are combined, a slit-shaped opening is formed above the substrate 2. Further, the upper rising 22a is provided with a notch 22b for projecting the hanging ring 6 (see FIG. 6). The left and right and lower rising 22a are continuous with each other. Further, as described above, the lid material 22 is provided with a fitting projection 22c for inserting and fitting into the hole 21c provided in the shaft portion 21b of the substrate 21. Further, screw holes 22d, 22e, and 22f are provided in the central portion and both end portions at locations facing the screw holes 21d, 21e, and 21f of the substrate 21 when they are overlapped with the substrate 21, respectively.

By the way, the circumferences of the screw holes 22e and 22f provided at both ends are raised (cylindrical). In addition, arcuate notches 22i and 22j are provided on the lower side of the rising edge 22g provided around the upper screw hole 22e and on the upper side of the rising edge 22h provided around the lower screw hole 22f, respectively. There is. Then, a fitting portion 22k for fitting the rubber-like elastic body 4 is formed by the rising 22g and 22h provided around the upper and lower screw holes 22e and 22f and the rising 22a of the edge portion located between them. The inner dimension of the fitting portion 22k is made slightly smaller (for example, about 0.5 to 1 mm) than the outer dimension (diameter) of the rubber-like elastic body 4, and the fitted rubber-like elastic body 4 repels. It is designed to be fixed naturally. A semi-circular notch 22l is also provided at the rising edge provided around the upper screw hole 22e, but this is to avoid interference with the swing arm 3 (see FIG. 5). ).

As shown in FIG. 4, the swing arm 3 extends downward from the mounting cylinder 3b for inserting the end portions 5a and 5a of the mounting ring 5 and the mounting cylinder 3b, and the mounting cylinder 3b is inserted into the shaft portion 21b of the substrate 21. It has a shaft hole 3c for swingably supporting the shaft. A metal pipe 3d is embedded inside the mounting cylinder 3b to improve wear resistance. Further, when attached to the substrate 2, a first inclined surface 3e facing the protrusion 21a of the substrate 21 is provided on the side surface facing the center side of the substrate 2, and the side surface facing the end side of the substrate 2 is rubber-like. A second inclined surface 3f facing the elastic body 4 is provided.

As shown in FIG. 1, the rubber-like elastic body 4 has a columnar shape, and its thickness (height in the axial direction) is thinner than the rising edge 22a. Further, the swing arm 3 is arranged so that the curved surface (side surface 5a of the cylinder) faces the outer surface (second inclined surface 3f described later) in the swing direction. 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 Sirico has excellent weather resistance. It is preferable to use rubber.

As shown in FIG. 1, the mounting ring 5 is formed by bending a metal wire into a trapezoidal shape. There is a gap between both ends 5a and 5a of the wire that is narrower than the axial length of the mounting cylinder 3b. By inserting these both ends 5a and 5a into the metal pipe 3d of the mounting cylinder 3b, It is attached to 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 ring 5 may be mounted rotatably with the end as a rotation axis.

As shown in FIGS. 5a and 5b, the back ring 1 having the above configuration becomes the second inclined surface 3f when the swing arm 3 is swung outward (in the direction in which the pair of swing arms 3 and 3 are separated from each other). The rubber-like elastic body 4 comes into contact with the rubber-like elastic body 4 and presses the rubber-like elastic body 4. The rubber-like elastic body 4 is restricted from moving in the in-plane direction by the rising edges 22a, 22g, and 22h, but the gap generated between the substrate 21 and the lid material 22 allows some movement in the out-of-plane direction. The swing arm 3 is allowed to swing by deforming so as to bulge in the axial direction (thickness direction) while changing the plan view shape. At this time, the gaps 7 formed between the rising 22a, 22g, and 22h and the rubber-like elastic body 4 serve as a retracted portion to promote deformation.

The rubber-like elastic body 4 that has been compressed and deformed by the swing of the swing arm 3 urges the swing arm 3 inward by a restoring force (repulsive force) that tries to return to the original shape. Therefore, if the outward load on the swing arm 3 is eliminated, the swing arm 3 moves inward, and the first inclined surface 3e is brought into contact with the regulation portion 21a of the substrate 21 to reach the basic position. go back.

As described above, in the spine ring 1 of the present invention, since the rubber-like elastic body 4 is used instead of the metal leaf spring when urging the swing arm 3, the spine ring 1 has excellent durability. be able to. In particular, unlike leaf springs, the swing arm 3 is not allowed to swing by bending, but is allowed to swing by its own compression deformation, so fatigue fracture is unlikely to occur. For example, when a metal leaf spring is used, it breaks after shaking 10,000 to 20,000 times, but it has been confirmed that a silicone-based rubber can withstand 100,000 swings. In addition, since screw holes 21e, 21f, 22e, and 22f are provided close to the top and bottom of the fitting portion 22j, if the back ring 1 is screwed to the back support portion 10a of the land cell body 10, the substrate 21 and the lid material can be used. The rubber-like elastic body 4 can be firmly supported by 22 and the rubber-like elastic body 4 does not bulge excessively in the out-of-plane direction (axial direction), and a stable urging force can be obtained.

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

For example, in the above embodiment, the columnar rubber-like elastic body 4 is used, but the present invention is not limited to this, and various shapes such as elliptical columnar and prismatic may be adopted, and the axial direction is directed to the swing direction. You may do so. By changing the shape and arrangement in this way, the spring constant can be easily adjusted. Further, although the lid material 22 is provided with the rising 22a, 22g, 22h and the fitting portion 22j, it may be provided on the substrate 21. Further, regarding the connection of the backpack belt 11 to the swing arm 3, a 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 ... School bag back ring 2 ... Base 21 ... Board 21a ... protrusion 21b ... Shaft 21c ... hole 21d ... Screw hole (center) 21e ... Screw hole (above the end) 21f ... Screw hole (below the end) 22 ... Lid material 22a ... Rise of the edge 22b ... notch 22c ... Fitting protrusion 22d ... Screw hole (center) 22e ... Screw hole (above the end) 22f ... Screw hole (below the end) 22g ... Rise provided around the upper screw hole 22h ... Rise provided around the lower screw hole 22i ... notch (upper side) 22j ... notch (lower side) 22k ... Fitting part 22l ... notch 3 ... Swing arm 3a ... Top 3b ... Mounting cylinder 3c ... Shaft hole 3d ... metal pipe 3e ... 1st slope 3f ... 2nd slope 4 ... Rubber elastic body 4a ... side 5 ... Mounting ring 5a ... end 6 ... Hanging ring 7 ... Gap 10 ... School bag body 10a ... backrest 10b ... bottom 11 ... Backpack belt