Belt mounting device and backpack

Abstract

To provide a belt mounting device and a backpack that facilitate easy insertion and removal of the arms into shoulder belts and allow the backpack to fit the body appropriately.SOLUTION: A belt mounting device comprises a case body 20 attached and fixed to a back plate of a backpack 1, and a pair of left and right arm members 40 provided on the case body 20. A belt mounting portion 40B is provided at each upper end of the pair of left and right arm members 40, to which each end of a pair of left and right shoulder belts 4 provided on the backpack 1 is attached. The pair of left and right arm members 40 is configured to be swingable relative to the case body 20 and slidable in obliquely upward and downward directions, thereby allowing the belt mounting portions 40B to move closer to or away from each other.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a belt attachment device for use with backpacks such as school bags and school rucksacks, and to a backpack having this belt attachment device. [Background technology]

[0002] A known technology for a belt attachment device used to attach the shoulder straps of a school bag to the school bag itself is to provide teeth on the opposing sides of the connecting body that makes up the belt attachment device, and these teeth mesh with each other to attach the connecting bodies so that they can swing left and right, and also to provide inward elasticity to each connecting body (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-081800 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned prior art, the connecting bodies of the belt attachment device are each designed to be able to swing freely left and right, so the position of the shoulder belt can be moved left and right within the swing range of the connecting bodies according to the user's physique, and the inward elasticity of the connecting bodies allows it to be maintained in a position according to the user's physique. However, because the connecting member is limited to movement within a swinging range, there is still room for improvement, as it is difficult to put your arms in and out when putting the school bag on or taking it off, and it feels cramped.

[0005] The present invention has been made in view of the above circumstances, and its object is to provide a belt attachment device that allows easy insertion and removal of arms into the backpack belt when putting on or taking off a backpack such as a school bag, and that allows the backpack to fit suitably to the body, and a backpack bag having this belt attachment device. [Means for solving the problem]

[0006] In view of the above problems, one aspect of the present invention is provided with the following configuration. A belt attachment device comprising: a case body that is attached and fixed to the back panel of a backpack; and a pair of left and right arm members that are attached to the case body, wherein the upper ends of the pair of left and right arm members are each provided with a belt attachment portion to which one end of a pair of left and right shoulder belts that are attached to the backpack are attached, and the pair of left and right arm members are each arranged to be swingable relative to the case body and to be slidable diagonally up and down, thereby allowing the belt attachment portions to be moved in directions that bring them closer to or apart from each other. [Effects of the Invention]

[0007] With the above-described configuration, the belt attachment device and backpack of the present invention make it easy to put your arms in and out of the backpack belt when putting the backpack on or taking it off, and also allows the backpack to fit comfortably to your body. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic front view of a backpack to which a belt attachment device according to an embodiment of the present invention is attached, as viewed from the back. [Figure 2] FIG. 2 is a schematic front view showing the internal structure of the belt attachment tool. [Figure 3] 3A and 3B are schematic front views illustrating the case body that constitutes the belt attachment, where FIG. 3A shows the case main body of the case body, FIG. 3B shows the cover member of the case body, and FIG. 3C shows the reinforcing member that reinforces the case body. [Figure 4]FIG. 10 is a schematic front view showing the belt attachment tool in a disassembled state, showing a slide member and an arm member. [Figure 5] 10 is a schematic front view showing a state in which the slide member and the arm member that constitute the belt attachment are assembled together. FIG. [Figure 6] 10 is a schematic front view illustrating an assembly structure of the case body, slide member, and arm member that constitute the belt attachment. FIG. [Figure 7] 7A and 7B are schematic diagrams illustrating the movable state of the belt attachment device, where Fig. 7A shows the normal state in which no external force (load) is acting on the shoulder belt, Fig. 7B shows a state in which an external force (load) is acting on one of the shoulder belts, and Fig. 7C shows a state in which an external force (load) is acting on both shoulder belts. [Figure 8] 8A and 8B are schematic front views illustrating a modified example of a belt attachment according to an embodiment of the present invention, in which FIG. 8A is a schematic front view of a case body that constitutes the belt attachment, and FIGS. 8B and 8C are schematic front views illustrating the state in which a slide member is assembled to the case body. DETAILED DESCRIPTION OF THE INVENTION

[0009] (First embodiment) First, the overall structure of a school bag 1 will be described as an example of a backpack according to an embodiment of the present invention. Fig. 1 is a schematic front view of a backpack (school bag) with a belt attachment device according to an embodiment of the present invention attached, as seen from the back, and Fig. 2 is a schematic front view showing the internal structure of the belt attachment device.

[0010] In the following explanation, the up-down direction (up-down direction in Fig. 1) when the school bag 1 is worn on the back is referred to as the "up-down direction" or "vertical direction," and the width direction of the school bag 1 (left-right direction in Fig. 1), which is perpendicular to the up-down direction (vertical direction), is referred to as the "left-right direction." Additionally, the "diagonal up-down direction" refers to a diagonal direction that intersects with the "vertical direction" at an acute angle.

[0011] (Overall structure of the school bag) As shown in Figure 1, the school bag 1 has a back panel 3 of a school bag body 2 made of leather, synthetic resin, or other material, which is a rectangular cylindrical body with a lid and a bottom, and has belt attachment devices 10 (back hooks) arranged in the upper center of the back panel 3 to which one end (upper end) of each of a pair of left and right shoulder straps 4 is attached.

[0012] As shown in Figure 2, this belt attachment device 10 is configured to include a synthetic resin case body 20 that is attached and fixed to the back panel 3 and has a roughly horizontally elongated oval shape when viewed from the front, a pair of left and right slide members 30 that are slidably movable in diagonal vertical directions relative to this case body 20, and a pair of left and right arm members 40 that are slidably (rotatably) mounted on each slide member 30. The belt attachment 10 is also provided with a hanging member 5 between the pair of arm members 40 for hanging the school bag 1 by hooking it onto a hanging tool (not shown).

[0013] Hereinafter, the specific configurations of the case body 20, slide member 30, and arm member 40 that constitute the belt attachment 10 according to the embodiment of the present invention will be described with reference to FIGS.

[0014] <Case body> The case body 20 is fixed to the upper center of the back panel 3 of the school bag main body 2, and has a case body 21 (see Figure 3(a)) that is approximately horizontally elongated elliptical when viewed from the front, and a cover member 27 (see Figure 3(b)) that is approximately horizontally elongated elliptical when viewed from the front and is arranged in front of the case body 21, and in the space between the case body 21 and the cover member 27, a slide member 30 (see Figure 4) that supports the arm member 40 so that it can swing (rotate) is arranged so that it can move diagonally up and down.

[0015] The term "diagonal vertical direction" refers to a diagonal direction that intersects with the "vertical direction (plumb line)" at an acute angle, and this angle can be set arbitrarily. Preferably, the diagonal vertical direction is set at an angle of approximately 20 to 60 degrees with respect to the plumb line, and particularly preferably at an angle of approximately 45 degrees with respect to the plumb line. By setting the diagonal vertical direction in this manner, when putting on or taking off the backpack bag, the positions of the ends of the pair of shoulder straps 4 move upward while spreading out more effectively in the left-right direction, making it easier to put your arms in and out of the shoulder straps 4.

[0016] [Case body] As shown in Figure 3(a), the case main body 21 includes a first base wall portion 22 that extends across its left and right outer portions and bottom and protrudes with a predetermined thickness, and a second base wall portion 23 that extends in the vertical direction from approximately the center of the first base wall portion 22 in the horizontal direction and protrudes with the same thickness as the first base wall portion 22, and is integrally molded from, for example, a synthetic resin material.

[0017] Left and right openings 24 are formed in the upper part of the case main body 21 for inserting the left and right arm members 40, and each of these openings 24 is located between the left and right upper ends of the first base wall portion 22 and the upper end of the second base wall portion 23.

[0018] Further, guide grooves 25 that guide each slide member 30 so that it can slide in an obliquely upward and downward direction are formed in case main body 21. These guide grooves 25 are configured as concave grooves defined by first base wall portion 22 and second base wall portion 23, and include an upper movement restricting surface 25a that restricts the upward movement of slide member 30, a lower movement restricting surface 25b that restricts the downward movement of slide member 30, left and right slide member guide surfaces 25c, 25d that guide slide member 30 in the obliquely upward and downward directions, and a housing / holding portion 25e that houses and holds the upper end of elastic body 50, which is formed of, for example, a metal coil spring that elastically biases slide member 30 in an obliquely downward direction.

[0019] The upper movement restricting surface 25a abuts against the upper end of the slide member 30 (see Figure 4) to restrict the movement of the slide member 30, and is composed of a step portion extending in the left-right direction formed between the upper edge of the guide groove 25 and the opening 24. The lower movement restricting surface 25b abuts against the bottom surface 31a of the first wall portion 31 of the slide member 30 and the outer surface 32a of the second wall portion 32 to restrict the movement of the slide member 30, and is composed of an inner wall surface 25b1 extending horizontally of the first base wall portion 22 and an inner wall surface 25b2 extending vertically in the up-down direction of the second base wall portion 23.

[0020] The left and right slide member guide surfaces 25c, 25d guide the first inclined surface 31b and the third inclined surface 33a of the slide member 30 so that they can slide, and are formed on the left and right inner wall surfaces of the guide groove 25 that face each other. One of the slide member guide surfaces 25c that guides the first inclined surface 31b of the slide member 30 is composed of an inner wall surface extending diagonally upward and downward of the first base wall portion 22, and the other slide member guide surface 25d that guides the third inclined surface 33a of the slide member 30 is composed of an inner wall surface 25d1 that extends diagonally upward and downward of the second base wall portion 23 and a step portion 25d2 that extends diagonally upward and downward and is formed between the side edge of the guide groove 25 and the opening 24.

[0021] The accommodating / holding portion 25e that accommodates and holds the end of the elastic body 50 (see FIG. 2) is formed as a recess that is recessed in the upper end of the first base wall portion 22. The lower inner surface of the accommodating / holding portion 25e that forms the recess is connected to the slide member guide surface 25c, forming the same inclined surface.

[0022] [Cover material] 3(b), the cover member 27 is formed in a generally horizontally elongated ellipse in front view, similar to the case body 21, and is molded into a plate shape from a synthetic resin material, for example. This cover member 27 is disposed in front of the case body 21 and abuts against the front surfaces of the first base wall portion 22 and the second base wall portion 23 of the case body 21 to cover the guide groove 25. In other words, the slide member 30 that supports the arm member 40 so that it can swing (rotate) is disposed in the guide groove 25 that forms the space between the case body 21 and the cover member 27 so as to be movable in an oblique vertical direction (see FIG. 6).

[0023] Additionally, a circular arc plate-shaped reinforcing member 28 (Fig. 3(c)) is disposed on the upper outer surface of the cover member 27, and is riveted to the back panel 3 of the school bag 1 to reinforce the case body 20. In other words, the case body 20 is fixed to the back panel 3 of the school bag main body 2 by inserting rivets (not shown) from the multiple through holes 28a provided in the reinforcing member 28 to the multiple through holes 27a provided in the cover member 27, and then by inserting these rivets through the multiple through holes 21a provided in the case main body 21, and riveting the rivets.

[0024] <Slide component> Next, the slide member 30 will be described. 4 to 6, the slide member 30 supports the lower end of the arm main body 40A so that it can swing (rotate), and is configured to be movable (slidable) in an oblique vertical direction along a guide groove 25 formed in the case main body 21. As shown in Fig. 4, the slide member 30 has an arm support part 30A that supports the arm main body 40A, an elastic body holding part 30B that supports (holds) an elastic body 60 that elastically biases the arm main body 40A, and a pressed part 30C that is pressed by an elastic body 50 (see Fig. 6) arranged in the case main body 21, and is integrally molded from, for example, a synthetic resin.

[0025] Specifically, the slide member 30 includes a first wall portion 31 that protrudes with a predetermined thickness from the outer left-right portion to the bottom portion, a second wall portion 32 that is connected to one end of the first wall portion 31 and protrudes with a predetermined thickness extending in the vertical direction approximately perpendicular to the inner left-right portion of the slide member 30, a third wall portion 33 that is connected to the upper end of the second wall portion 32 and protrudes with a predetermined thickness extending diagonally in the vertical direction, and a fourth wall portion 34 that protrudes with a predetermined thickness extending at an angle when viewed from the front, and has one end connected to the joint between the second wall portion 32 and the third wall portion 33.

[0026] [Arm support] The arm support portion 30A is formed as a concave arm support surface 30a1 surrounded by the first wall portion 31 and the fourth wall portion 34, and has, at approximately the center thereof, a shaft portion 35 that pivotally supports the insertion hole 44 of the arm main body 40A so that it can swing (rotate). The shaft portion 35 is formed integrally with the arm support surface 30a1 of the arm support portion 30A and protrudes in a substantially cylindrical shape.

[0027] The arm support portion 30A also has an arm guide surface 30a2 that slidably guides the curved portion 45 of the arm main body 40A. This arm guide surface 30a2 is formed by the wall surface of the first wall portion 31, and specifically, is formed as a guide surface that is curved to guide the curved portion 45 of the arm main body 40A slidably and swingably (rotatably).

[0028] In addition, the arm support portion 30A is formed with a first swing regulating portion 36 that abuts against a first protrusion 41 of the arm member 40 to regulate the arm member 40's outward swing (rotation) in the left-right direction, a second swing regulating portion 37 that abuts against a second protrusion 42 of the arm member 40 to regulate the arm member 40's inward swing (rotation) in the left-right direction, and a third swing regulating portion 38 that abuts against a third protrusion 43 of the arm member 40 to regulate the arm member 40's inward swing (rotation) in the left-right direction.

[0029] The first swing regulating portion 36 is formed on the end face of the wall portion extending in the vertical direction in the first wall portion 31, the second swing regulating portion 37 is formed on the upper surface of the wall portion extending in the left-right direction in the fourth wall portion 34, and the third swing regulating portion 38 is formed on the upper surface near the inside of the wall portion extending in the left-right direction in the first wall portion 31.

[0030] [Elastic body holding part] The elastic body holding portion 30B is formed to have a concave shape surrounded by the second wall portion 32 and the fourth wall portion 34, and this elastic body holding portion 30B supports (holds) an elastic body 60 that elastically urges the third protrusion 43 formed on the arm main body 40A downward.

[0031] The elastic body holding portion 30B is provided with a substantially cylindrical protrusion 30B1 as a holding member that fixedly holds the upper end of the elastic body 60. The elastic body 60 is made of, for example, a metal coil spring, and is attached and fixed by fitting its upper end into the substantially cylindrical protrusion 30B1. A pressing member 60a made of, for example, a synthetic resin material with a curved surface at the end is attached to the lower end of the elastic body 60, and the pressing member 60a is configured to come into contact with and press the third protrusion 43 of the arm member 40 (see FIG. 5).

[0032] In other words, the arm member 40 is maintained in an approximately vertical state extending in the up and down direction in the normal state where no external force (load) is acting on the carrying belt 4, as the third protrusion 43 is pressed downward by the elastic body 60 (pressing member 60a) arranged in the elastic body holding portion 30B. Furthermore, when an external force (load) that pulls the shoulder straps 4 outward is applied, such as when the school bag 1 is carried on the back, the arm member 40 swings (rotates) outward relative to the slide member 30 against the biasing force of the elastic body 60, thereby functioning to spread the shoulder straps 4.

[0033] [Pressure receiving part] The pressed portion 30C is a portion that is pressed by an elastic body 50 (see FIG. 6) arranged in the case body 21, and is formed on the outer wall surface of the first wall portion 31. The pressed portion 30C is pressed obliquely downward by the biasing force of the elastic body 50 that is housed and held in the housing / holding portion 25e of the case body 21.

[0034] The elastic body 50 is compressed between the upper end of the storage holding portion 25e and the pressed portion 30C of the slide member 30 and is biased to press the slide member 30 diagonally downward, so that the slide member 30 is maintained in contact with the lower movement restriction surface 25b (25b1, 25b2) of the guide groove 25 formed in the case main body 21 in the normal state where no external force (load) is acting on the carrying belt 4.

[0035] Furthermore, for example, when carrying the school bag 1, when an external force (load) acts on the shoulder strap 4, pulling it outward, the slide member 30 supporting the arm member 40 slides diagonally upward against the biasing force of the elastic body 50, thereby functioning to spread the shoulder strap 4.

[0036] As shown in Figures 3 and 4, the outer wall surface of the first wall portion 31 of the slide member 30 is formed with a first inclined surface 31b as an inclined surface extending in the diagonal vertical direction that is slidable along the slide member guide surface 25c formed on the case main body 21 and guided to be able to slide in the diagonal vertical direction, and the outer wall surface of the third wall portion 33 is formed with a third inclined surface 33a as an inclined surface extending in the diagonal vertical direction that is slidable along the slide member guide surface 25d formed on the case main body 21 and guided to be able to slide in the diagonal vertical direction. Therefore, the first inclined surface 31b and the third inclined surface 33a are guided by the slide member guide surfaces 25c, 25d of the case body 21, respectively, so that the slide member 30 can move diagonally up and down smoothly and stably.

[0037] <Arm component> Next, the arm member 40 will be described. As shown in FIG. 4, the pair of left and right arm members 40 have, for example, a plate-like arm body 40A formed in a flat plate shape extending in the vertical direction, and a belt attachment portion 40B provided on the upper part of the arm body 40A, and are integrally molded, for example, from a synthetic resin material.

[0038] [Arm body] The arm main body 40A is formed in the shape of a flat plate extending substantially vertically in the up-down direction, and has an insertion hole 44 formed in the lower part thereof, through which the shaft portion 35 of the slide member 30 is inserted. This insertion hole 44 is pivotally supported by the shaft portion 35 of the slide member 30, which is formed in a substantially cylindrical shape. Therefore, the arm main body 40A is supported relative to the slide member 30 so as to be able to swing (rotate) left and right.

[0039] Furthermore, the arm main body 40A is formed with a first protrusion 41, a second protrusion 42, and a third protrusion 43 that protrude outward from the left and right side portions (inner portion, outer portion) thereof. When the arm main body 40A is pivotally supported by the slide member 30, the first protrusion 41, the second protrusion 42, and the third protrusion 43 come into contact with the first swing restriction portion 36, the second swing restriction portion 37, and the third swing restriction portion 38 formed on the slide member 30, respectively, thereby restricting the swing angle of the arm member 40 in the left and right direction to a predetermined angle.

[0040] Specifically, the first protrusion 41 is configured as a protrusion that protrudes outward, for example, at approximately the center position of the outer left-right portion of the arm main body 40A, and by abutting against the first swing regulation portion 36 formed on the slide member 30, the swing (rotation) of the arm member 40 outward in the left-right direction is regulated. In addition, the second protrusion 42 is configured, for example, as a protrusion protruding outward at approximately the center position of the inner left-right portion of the arm main body 40A, and by abutting against the second swing regulation portion 37 formed on the slide member 30, the swing (rotation) of the arm member 40 inward left-right is regulated. In addition, the third protrusion 43 is configured, for example, as a protrusion protruding outward at the lower end position of the inner left-right portion of the arm main body 40A, and by abutting against the third swing regulation portion 38 formed on the slide member 30, the swing (rotation) of the arm member 40 inward left-right is regulated.

[0041] The outer side in the left-right direction of the arm main body 40A means the right side of the arm main body 40A shown on the right side of Fig. 4, and means the left side of the arm main body 40A shown on the left side of Fig. 4. The inner side in the left-right direction of the arm main body 40A means the left side of the arm main body 40A shown on the right side of Fig. 4, and means the right side of the arm main body 40A shown on the left side of Fig. 4.

[0042] Additionally, the third protrusion 43 is pressed downward by an elastic body 60 disposed in the elastic body holding portion 30B of the slide member 30, and is biased so as to abut against the third swing restriction portion 38 of the slide member 30 (see FIGS. 5 and 6). In other words, when no external force (load) is acting on the shoulder strap 4, the arm main body 40A is maintained in a substantially vertical state in which it extends in the up-down direction due to the biasing force of the elastic body 60.

[0043] [Belt attachment part] Belt attachment part 40B is the part to which ring 6 (see FIG. 2) made of a metal ring is attached, and for example, has a through-hole (not shown) formed therein for ring 6 to pass through. Ring 6 is formed by bending or curving a single metal rod in several places to form an overall closed shape such as a square or triangle (triangle in the illustrated example). The lower edge of ring 6 is passed through the through-hole of belt attachment part 40B so that it can swing back and forth, and the end of carrying belt 4 is connected to the upper edge. The configuration of belt attachment part 40B is not limited to the above example. For example, an insertion part that opens upward may be integrally formed at the upper end of arm main body 40A, and the upper end of shoulder belt 4 may be inserted into this insertion part and fixed with a rivet.

[0044] (Movement of the belt attachment) Next, we will explain an example of how the belt attachment device moves when an external force (load) acts on the shoulder straps 4, such as when carrying the school bag 1. Figure 7 is a schematic diagram explaining how the belt attachment device moves, with Figure 7(a) showing the normal state when no external force (load) acts on the shoulder straps, Figure 7(b) showing a state when an external force (load) acts on one of the shoulder straps, and Figure 7(c) showing a state when an external force (load) acts on both shoulder straps.

[0045] <Normal state> As shown in Figure 7(a), in a normal state where no external force (load) is acting on the shoulder strap 4, the pair of left and right arm members 40 are in a state where the distance M1 between the pivots of each arm member 40 is at its closest, and each arm member 40 is maintained in a substantially vertical state extending in the up-down direction. In other words, the slide member 30 that supports the arm members 40 so that they can swing (rotate) is urged diagonally downward as shown by arrow A in Figure 7(a) by the elastic body 50 housed and held in the case main body 21, and abuts against the lower movement restriction surface 25b of the guide groove 25 (see Figure 3(a)), thereby positioning the lower ends of the arm members 40 in a state where they are closest to each other.

[0046] In addition, the arm member 40 is urged by the elastic body 60 arranged in the elastic body holding portion 30B of the slide member 30 to swing (rotate) the arm member 40 in a direction that positions it upright inward, as shown by arrow B in Figure 7(a), and the second protrusion 42 and the third protrusion 43 of the arm member 40 abut against the second swing regulating portion 37 and the third swing regulating portion 38 formed on the slide member 30, respectively, thereby positioning the arm member 40 in an approximately vertical state extending in the up-down direction (see Figure 5). Therefore, the distance L1 between the belt attachment portions 40B disposed at the upper ends of the pair of left and right arm members 40 is at its narrowest (smallest) state.

[0047] <An example of an external force (load) acting on one of the shoulder straps> Also, as shown in Figure 7(b), when an external force (arrow C) acts on one side (left side in the figure) of the shoulder strap 4, for example, when carrying the school bag 1 on one back, causing it to rotate outward in the left-right direction, the arm member 40 swings (arrow C') relative to the slide member 30, adjusting the position of the shoulder strap 4.

[0048] That is, the arm member 40 on one side can swing (rotate) outward in the left-right direction as shown by arrow C' against the biasing force of the elastic body 60. In this case, the arm member 40 on one side can swing (rotate) within a range in which the first protrusion 41 of the arm member 40 abuts against the first swing restriction portion 36 formed on the slide member 30 (see FIG. 5). By such swinging (rotating) of one arm member 40, the distance L2 between the belt attachment portions 40B arranged at the upper ends of the pair of left and right arm members 40 is adjusted to be wider than the distance L1 between the belt attachment portions 40B in the normal state. In the illustrated example, the pair of left and right arm members 40 are maintained in a state where the distance M2 between the pivot supports of each arm member 40 is closest (M1 = M2).

[0049] <An example of an external force (load) acting on a pair of shoulder straps> Furthermore, as shown in Figure 7(c), for example, when carrying the school bag 1, an external force (arrow C) that rotates one of the shoulder straps 4 (left side in the figure) outward in the left-right direction and an external force (arrow D) that pulls it outward act on one of the shoulder straps 4 (left side in the figure), and an external force (arrow E) that pulls it up and down act on the other shoulder strap 4 (right side in the figure), one of the arm members 40 swings (arrow C') relative to the slide member 30 and moves diagonally upward (arrow D') relative to the case body 20, and the other arm member 40 moves diagonally upward (arrow E') relative to the case body 20, thereby adjusting the position of the shoulder straps 4.

[0050] That is, one arm member 40 swings (rotates) as indicated by arrow C' against the biasing force of elastic body 60, and can also move diagonally upward and outward as indicated by arrow D' against the biasing force of elastic body 50. In this case, one arm member 40 can swing (rotate) within a range in which first protrusion 41 of arm member 40 abuts against first swing restriction portion 36 formed on slide member 30 (see FIG. 5), and can also slide within a range in which the upper end of slide member 30 abuts against upper movement restriction surface 25a formed on case main body 21 (see FIG. 6). The other arm member 40 is slidable within a range in which the upper end of the slide member 30 abuts against an upper movement restricting surface 25 a formed on the case body 21 .

[0051] In this way, the belt attachment portions 40B provided at the upper ends of the pair of left and right arm members 40 can move in directions to move the belt attachment portions 40B closer to or farther apart, by each arm member 40 being arranged to be swingable and slidable in an obliquely upward and downward direction relative to the case body 20. By such swinging (rotating) of the pair of arm members 40 and sliding outward in an obliquely upward direction, the distance M3 between the lower ends of the arm members 40 becomes wider than the distance M1 between the pivot supports of each arm member 40 in the normal state, and further, the distance L3 between the belt attachment portions 40B arranged at the upper ends of the pair of left and right arm members 40 is also adjusted so as to become wider than the distance L1 between the belt attachment portions 40B in the normal state.

[0052] Therefore, for example, when an external force (load) acts on the carrying belt 4 when putting on or taking off the school bag 1, each arm member 40 will swing (pivot) and / or slide in response to the external force (load) at that time, adjusting to increase the distances L1, L2, L3 between each belt attachment portion 40B, making it easier to put your arms in and out of the carrying belt 4, and preventing it from being difficult or feeling cramped.

[0053] Furthermore, after the school bag 1 is put on the back, the arm members 40 swing (pivot) and / or slide back to their original positions due to the biasing force of the elastic bodies 50, 60, so that the carrying straps 4 fit snugly against the shoulders and stop at a position suited to the wearer's physique. This allows the school bag 1 to be carried in an appropriate position snugly against the shoulders, allowing the school bag 1 to fit the body optimally.

[0054] Next, modified examples of the belt attachment device according to the present invention will be described with reference to the drawings.

[0055] (Second embodiment) Figure 8 is a front schematic view illustrating a modified example of a belt attachment according to an embodiment of the present invention, where Figure 8(a) is a front schematic view of the case body that constitutes the belt attachment, and Figures 8(b) and 8(c) are front schematic views illustrating the state in which a slide member is assembled to the case body. The belt attachment device 10' shown in Figure 8 is a modified version of the belt attachment device 10 described above, so we will mainly explain the modified parts, and the same components as the belt attachment device 10 described above will be given the same symbols and redundant explanations will be omitted.

[0056] The belt attachment device 10' of the second embodiment is configured by adding a guide hole 26 extending diagonally upward and downward to the case body 21 of the belt attachment device 10 shown in Figure 3, and by adding a guide protrusion 39, which is guided by this guide hole 26, to the back side of the slide member 30 shown in Figure 4; the other configurations are the same as those of the belt attachment device 10 described above.

[0057] Specifically, as shown in Fig. 8(a), in the case main body 21', a guide hole 26, which is an elongated hole extending diagonally up and down, is formed through the bottom surface of the guide groove 25, and a guide protrusion 39 provided to protrude from the back surface of the slide member 30' is guided in a sliding state through the guide hole 26. The guide protrusion 39 is disposed, for example, so as to be located on the back surface side of a shaft portion 35 (see Fig. 4) provided on the obverse side (front) of the slide member 30', and is configured as, for example, a protrusion having a substantially cylindrical or substantially square prism shape (in the illustrated example, a substantially cylindrical protrusion). The tip of the guide protrusion 39 is configured to fit within the guide hole 26 without protruding from the guide hole 26.

[0058] According to this belt attachment device 10', the first inclined surface 31b and the third inclined surface 33a of the slide member 30' are guided by the left and right slide member guide surfaces 25c, 25d of the case main body 21', and the guide protrusion 39 is guided by the guide hole 26, so that the slide member 30' can be guided more stably relative to the case main body 21' so that it can move diagonally up and down.

[0059] (Other variations) In the above embodiment, each arm member 40 is elastically biased relative to each slide member 30 using an elastic body 60 made of, for example, a metal coil spring so that the upper ends of the arm members swing toward each other, but this is not limiting. For example, a torsion spring may be interposed between the slide member 30 and the arm member 40 to elastically bias the upper ends of the arm members 40 so that they swing toward each other.

[0060] Furthermore, the present invention is not limited to the specific configurations described above, and can be modified as appropriate within the scope of the present invention.

[0061] <Summary> As described above, the above embodiments disclose the following inventions. (1) A belt attachment device comprising: a case body that is attached and fixed to the back panel of a backpack; and a pair of left and right arm members that are attached to the case body, wherein the upper ends of the pair of left and right arm members are each provided with a belt attachment portion to which one end of a pair of left and right shoulder belts that are attached to the backpack are attached, and the pair of left and right arm members are each arranged to be swingable relative to the case body and to be slidable diagonally up and down, thereby allowing the belt attachment portions to be moved in directions that bring them closer to or apart from each other. (2) The belt attachment described in (1) above is characterized in that it comprises a pair of left and right slide members supported on the case body so as to be able to slide diagonally up and down, and the pair of left and right arm members are each supported so as to be able to swing on the pair of left and right slide members, so that they are able to swing relative to the case body and slide diagonally up and down. (3) The belt attachment device described in (2) above is characterized in that the case body has a case main body in which guide grooves are formed to guide the pair of left and right slide members in diagonal up and down directions, and a cover member that covers the case main body from the front side. (4) The belt attachment device described in (3) above is characterized in that the guide groove has an upper movement restriction surface that restricts the diagonally upward movement of the slide member, a lower movement restriction surface that restricts the diagonally downward movement of the slide member, and a slide member guide surface that guides the slide member diagonally up and down. (5) The belt attachment device described in any one of (2) to (4) above, characterized in that the pair of left and right arm members are each elastically biased relative to the pair of left and right slide members so that the upper ends of the arm members swing toward each other, and the pair of left and right slide members are each elastically biased relative to the case body so that the upper ends of the arm members slide diagonally downward toward each other. (6) A backpack equipped with the belt attachment device according to any one of (1) to (5) above. [Explanation of symbols]

[0062] 1: School bag (backpack) 3: Back plate 4: Carrying belt 10,10': Belt attachment 20: Case body 21: Case body 25: Guide groove 25a: Upper movement control surface 25b: Lower movement control surface 25c, 25d: Slide member guide surface 27: Cover material 30: Slide member 40: Arm member 40A: Arm body 40B: Belt attachment part

Claims

1. a case body that is attached and fixed to the back panel of the backpack; a pair of left and right arm members provided on the case body; Equipped with a pair of left and right arm members each having an upper end provided with a belt attachment portion to which one end of a pair of left and right shoulder belts provided on the backpack is attached, The pair of left and right arm members are provided so as to be swingable relative to the case body and slidable in an oblique vertical direction, so that the belt attachment portions can be moved in a direction to approach or move away from each other. A belt attachment device characterized by:

2. a pair of left and right slide members supported on the case body so as to be slidable in an oblique up-down direction; The pair of left and right arm members are swingably supported by the pair of left and right slide members, respectively, and are provided swingably and slidably in an obliquely upward and downward direction relative to the case body.

2. The belt attachment device according to claim 1.

3. The case body is a case body having guide grooves formed therein for guiding the pair of left and right slide members in the diagonal up and down directions; a cover member that covers the case body from the front side; 3. The belt attachment according to claim 2.

4. The guide groove is an upper movement restriction surface that restricts the obliquely upward movement of the slide member; a lower movement restriction surface that restricts the diagonally downward movement of the slide member; a slide member guide surface that guides the slide member in an oblique vertical direction; 4. The belt attachment according to claim 3.

5. The pair of left and right arm members are elastically biased relative to the pair of left and right slide members so that the upper ends of the arm members swing toward each other, and Each of the pair of left and right slide members is elastically biased relative to the case body so that the upper ends of the arm members slide diagonally downward toward each other.

3. The belt attachment according to claim 2.

6. A backpack comprising the belt attachment device according to any one of claims 1 to 5.

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