JP3203042U - The back ring of the school bag - Google Patents

Abstract

A back ring of a school bag having excellent durability and good assemblability is provided. A base body 2 attached to a back support portion of a school bag body, a swing arm 3 pivotally supported by the base body 2 and connected to one end side of a backpack belt of the school bag at an upper end portion, and the swing arm. A cylindrical rubber-like elastic body 4 that repels the outward swing of the moving arm 3 is provided. The rubber-like elastic body 4 is preferably arranged with a curved surface facing the outer surface of the swing arm 3 in the swing direction, and is made of silicone rubber. [Selection] Figure 1

Description

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

  As shown in FIGS. 6 and 7, the shoulder belt 11 is attached to the back rest 10 a of the school bag body 10 through the back ring 100.

  The back ring 100 is attached to the base 2 attached to the backrest 10 a of the school bag body 10, a pair of left and right swing arms 3 and 3 attached to the base 2 so as to be swingable, and the upper end 3 a of the swing arm 3. And an attachment ring 5 to which one end side of the shoulder belt 11 is connected. The back ring 100 is normally covered with a cover (not shown), and only the swing arm 3 protrudes to the outside. The other end of the shoulder belt 11 is connected to a mounting bracket (not shown) attached to the bottom 10b of the school bag body 10.

Japanese Utility Model Publication No. 2-149509 JP 2002-291511 A JP 2009-28401 A

  By the way, in the back rings of Patent Documents 1 to 3, the pair of left and right swing arms are urged toward a direction (inner side) close to each other by a spring. This arm urging spring is a so-called leaf spring or wirework spring made by bending a steel material for a plate or wire into a V-shape or a U-shape, and by elastic bending of the material. Since it is repulsive, it gives life at a relatively early stage when repeated stress is applied.

  Further, when the spring is extended or contracted, the end of the spring moves so as to rub the surface of the swing arm, so that the swing arm may be worn and cause malfunction.

  Furthermore, the spring is attached in a state of being compressed and deformed to some extent so that the urging force can still be applied with the oscillating arm returned to the basic position (so that the oscillating arm does not rattle). If it fails, the spring will fly off and the assembly is not necessarily good.

  Therefore, the present invention aims to provide a back ring that is excellent in durability and easy to assemble.

The back ring for a school bag of this invention has a base 2 attached to a back pad 10a of the school bag main body 10, and is pivotally supported by the base 2 so that one end side of the back belt 11 of the school bag is connected to the upper end. And a columnar rubber-like elastic body 4 that repels the outward swinging of the swinging arm 3.
Here, “repel” means that the rubber-like elastic body 4 is compressed and deformed to allow the swinging arm 3 to swing while returning to the original shape of the rubber-like elastic body 4 itself. This means that the swinging arm 3 is biased toward the original position before swinging by the restoring property (elasticity).

  It is preferable that the rubber-like elastic body 4 is disposed with a curved surface facing an outer surface in the swing direction of the swing arm 3.

  It is preferable that a fitting portion 22j for fitting the rubber-like elastic body 4 is formed in the base body 2.

  It is preferable that an inner dimension of the fitting portion 22j is smaller than an outer dimension of the rubber-like elastic body 4.

  The rubbery elastic body 4 is preferably made of silicone rubber.

  Since the back ring for a school bag of the present invention includes 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 cylindrical 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 in assembling, and furthermore, since it does not fly off like a leaf spring, the assembling can be performed easily and quickly.

  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 swinging of the swing arm returns to its original shape. Easy and stable repulsion can be obtained.

  Furthermore, if the fitting portion for fitting the rubber-like elastic body is formed on the base body, the attachment of the rubber-like elastic body to the base body becomes simple and the assemblability is improved.

  In particular, if the inner dimension of the fitting part is smaller than the outer dimension of the rubber-like elastic body, if the rubber-like elastic body is fitted, it will remain in the fitting part by its own repulsive force. There is no need to hold the elastic body by hand, and the assemblability is further improved.

  Further, if the rubber-like elastic body is made of silicone rubber, it has excellent weather resistance and can stably exert a repulsive force over a long period of time.

It is a disassembled perspective view which shows the back ring of the school bag which concerns on one Embodiment of this invention. It is a top view which shows the inner surface side of a board | substrate. It is a top view which shows the inner surface side of a cover material. The swing arm is shown, (a) is a front view, (b) is a side view. It is a front view which shows the rocking | fluctuation state of a rocking | fluctuating arm. It is a front view which shows the attachment state of a back ring. It is a perspective view which shows the whole form of a school bag.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a back ring 1 of a school bag according to an embodiment of the present invention. The back ring 1 includes a base 2 attached to a backrest 10a (see FIG. 6a) of the school bag body, a pair of left and right pivotally supported by the base 2, and one end of a shoulder belt 11 connected to an upper end. Swinging arms 3 and 3 and a rubber-like elastic body 4 repelling the swinging of the swinging arm 3. The upper end portion of the swing arm 3 and one end side of the shoulder belt 11 are connected via an attachment ring 5.

  The base body 2 includes a substrate 21 located on the backrest 10 a side of the school bag body 10 and a lid member 22 that covers the substrate 21.

  The board | substrate 21 is flat form, As shown in FIG.1 and FIG.2, the shape is left-right symmetric. A triangular protrusion 21 a is provided at a portion closest to the center of the substrate 21. This is a restricting portion that restricts 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 is provided for pivotally supporting the swing arm 3 so as to be swingable in the arrow direction. In the center of the shaft portion 21b, a hole 21c into which a fitting protrusion 22c of the lid member 22 described later can be fitted is provided. In addition, screw holes 21d, 21e, and 21f are provided in the center and both ends, respectively. In addition, the other hole is a hollow hole.

  As shown in FIGS. 1 and 3, the lid member 22 has a flat plate shape with rising edges, and the shape thereof is symmetric with respect to the substrate 21. The rising edge 22a of the edge portion projects the swing arm 3 pivotally supported by the shaft portion 21b of the substrate 21 outward (upward when attached to the backrest portion 10a of the school bag body 10). It is not provided in the range of motion. For this reason, when the substrate 21 and the lid member 22 are combined, a slit-like opening is formed in the base 2. Further, a notch 22b for projecting the hanging ring 6 (see FIG. 6) is provided on the upper rising 22a. The left and right rises 22a are continuous with each other. Further, as described above, the lid member 22 is provided with a fitting protrusion 22c for insertion and fitting into a hole 21c provided in the shaft portion 21b of the substrate 21. In addition, screw holes 22d, 22e, and 22f are provided at locations that face the screw holes 21d, 21e, and 21f of the substrate 21 when the substrate 21 is overlaid at the center and both ends, respectively.

  By the way, the periphery of the screw holes 22e and 22f provided at both end portions rises (has a cylindrical shape). Further, arc-shaped notches 22i and 22j are respectively provided below the rise 22g provided around the upper screw hole 22e and above the rise 22h provided around the lower screw hole 22f. Yes. A fitting portion 22k into which the rubber-like elastic body 4 is fitted is formed by the rising portions 22g and 22h provided around the upper and lower screw holes 22e and 22f and the rising portion 22a of the edge located therebetween. The inner dimension of the fitting portion 22k is 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 supposed to be fixed by itself. Note that a semicircular cutout 22l is also provided at the rise 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 includes a mounting cylinder 3 b for inserting the end portions 5 a and 5 a of the mounting ring 5, and extends downward from the mounting cylinder 3 b, and the mounting cylinder 3 b is connected to the shaft portion 21 b of the substrate 21. And a shaft hole 3c for pivotally supporting the shaft. A metal pipe 3d is embedded inside the mounting cylinder 3b to improve wear resistance. Further, in the state of being attached to the base body 2, a first inclined surface 3 e facing the protrusion 21 a of the substrate 21 is provided on the side surface facing the center side of the base body 2, and the rubber surface is formed on the side surface facing the end portion side of the base body 2. 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 cylindrical shape, and its thickness (axial height) is thinner than the rising edge 22a of the edge. Further, the swing arm 3 is arranged so that the curved surface (the side surface 5a of the cylinder) faces the outer surface (second inclined surface 3f described later) in the swing direction. As a material of the rubber-like elastic body 4, for example, synthetic rubber such as silicone rubber, urethane rubber, polyolefin rubber, elastomer, or natural rubber can be used, but silicone rubber having excellent weather resistance is used. preferable.

  As shown in FIG. 1, the mounting ring 5 is formed by bending a metal wire into a trapezoidal shape. Between the both ends 5a and 5a of the wire rod, an interval narrower than the axial length of the mounting cylinder 3b is provided, and 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. The attachment ring 5 is preferably attached in a state in which the rotation is constrained with respect to the swing arm 3, but it may be attached so as to be rotatable about the end portion as a rotation axis.

  As shown in FIGS. 5A and 5B, the back ring 1 having the above-described configuration is formed by rotating the swing arm 3 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 contacts 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 rises 22a, 22g, and 22h, but the gap generated between the substrate 21 and the lid member 22 allows the movement in the out-of-plane direction to some extent. The swing arm 3 is allowed to swing by being deformed so as to swell in the axial direction (thickness direction) while changing the shape in plan view. At this time, the gap 7 formed between each of the rising portions 22a, 22g, and 22h and the rubber-like elastic body 4 serves as a retracting portion, thereby promoting deformation.

  The rubber-like elastic body 4 compressed and deformed by the swing of the swing arm 3 urges the swing arm 3 inward by a restoring force (repulsive force) 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 restricting portion 21a of the substrate 21 to the basic position. Return.

  As described above, the back ring 1 of the present invention uses a rubber-like elastic body 4 instead of a metal leaf spring for biasing the swing arm 3, so that the back ring has excellent durability. be able to. In particular, since the swing arm 3 is not allowed to swing by bending as in the case of a leaf spring, but is allowed to swing by its own compressive deformation, fatigue failure hardly occurs. For example, when a metal leaf spring is used, breakage occurs after 1 to 20 thousand swings, but in the case of silicone rubber, it has been confirmed that it can withstand 100,000 swings. 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 backrest portion 10a of the school bag body 10, the substrate 21 and the lid material Thus, the rubber-like elastic body 4 can be firmly supported by the elastic member 22, and the rubber-like elastic body 4 does not swell excessively in the out-of-plane direction (axial direction), and a stable biasing force can be obtained.

  As mentioned above, although typical embodiment of this invention was described, this invention is not limited to the said embodiment, It is possible to implement in various changes within the scope of this invention.

  For example, in the above-described embodiment, the cylindrical rubber-like elastic body 4 is used. However, the shape is not limited to this, and various shapes such as an elliptical column shape and a rectangular column shape may be employed, and the axial direction is directed to the swinging direction. You may do it. Thus, the spring coefficient can be easily adjusted by changing the shape and arrangement. Further, although the rising 22a, 22g, 22h and the fitting portion 22j are provided on the lid member 22, they may be provided on the substrate 21. Further, regarding the connection of the shoulder belt 11 to the swing arm 3, the belt connecting portion may be integrally provided at the upper end of the swing arm 3 without using the attachment ring 5 and may be directly connected.

1. Back ring of school bag 2. Base 21. Substrate 21a. Protrusion 21b. Shaft 21c. Hole 21d. Screw hole (central part)
21e ... Screw hole (upper end)
21f ... Screw hole (below end)
22 .. Lid material 22a.. Rising edge 22b · · Notch 22c · · Fitting protrusion 22d · · Screw hole (center)
22e ... Screw hole (upper end)
22f ... Screw hole (below end)
22g ··· Rising 22h provided around the upper screw hole ··· Rising 22i provided around the lower screw hole ··· Notch (upper side)
22j ・ ・ Notch (lower side)
22k ··· fitting portion 22l · · notch 3 · · swing arm 3a · · upper end 3b · · mounting cylinder 3c · · shaft hole 3d · · metal pipe 3e · · first inclined surface 3f · · second inclined surface 4 · · Rubber elastic body 4a · · Side 5 · · Mounting ring 5a · · End 6 · · Suspension ring 7 · · Gap 10 · · School bag body 10a · · Backrest 10b · · Bottom 11 · · Shoulder belt

Claims (5)

A base body to be attached to the back rest of the school bag body;
A swing arm pivotally supported on the base body and connected to one end side of the backpack belt of the school bag at the upper end;
A back ring of a school bag comprising a columnar rubber-like elastic body repelling outward swing of the swing arm. The back ring of the school bag according to claim 1, wherein the rubber-like elastic body is disposed with a curved surface facing an outer surface in a swing direction of the swing arm. The back ring of the school bag of Claim 1 or 2 in which the fitting part for fitting the said rubber-like elastic body to the said base | substrate is formed. The back ring of the school bag according to claim 3, wherein an inner dimension of the fitting portion is smaller than an outer dimension of the rubber-like elastic body. The back ring of the school bag according to claim 1, wherein the rubber-like elastic body is made of silicone rubber.

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