Carrying belt mounting structure

Abstract

To provide a fitting structure of shoulder belts configured to further improve attaching / detaching operability of the shoulder belts when a user carries a backpack body on the back or detaches the backpack body from the back, even in a state of carrying it, easily bring an entire back pad part of the backpack body into contact with the back of the user and secure a favorable wearing state with a higher degree of fit.SOLUTION: A fitting structure of shoulder belts includes, at a bottom part of a backpack body, a pair of first adjustment parts capable of changing, along a prescribed direction, support positions at which lower ends of the pair of shoulder belts are supported at the bottom part, and a pair of second adjustment parts for respectively swingably supporting the pair of first adjustment parts.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an attachment structure for a shoulder strap in a backpack, such as a school bag or rucksack, which is carried on a user's back. [Background technology]

[0002] Backpacks such as school bags and rucksacks come in a variety of shapes and structures, but most of them have a back support that is supported against the user's back, a backpack main body that is carried on the user's back and has a storage compartment inside, and a pair of shoulder straps that are hung around the user's left and right shoulders to allow the backpack main body to be carried, with their upper ends supported above the back support of the backpack main body and their lower ends supported below the back support of the backpack main body.

[0003] In the school bag described in Patent Document 1, the overall length of the backpack belt relative to the backpack body can be variably adjusted by adjusting the fastening joint position between the lower end of the upper belt and the upper end of the lower belt, but once the backpack is on, it is difficult to adjust the length by changing the joint position of the upper belt and the lower belt. Therefore, if the backpack belt is set long to make it easier to put the backpack belt around the user's shoulders when carrying the backpack body, it is difficult to ensure a tight fit to the user's back because the length cannot be adjusted after carrying the backpack.

[0004] In contrast to this, the school bag described in Patent Document 2 is equipped with mounting fittings that allow a Daruma ring attached to the lower end of the shoulder strap to slide freely in slide holes on both the left and right ends of the back of the main body, which are inclined outward, while always being elastically loaded in the inward direction of the school bag.With this configuration, the Daruma ring slides through the slide hole while being elastically loaded in the inward direction of the school bag, making it possible to fine-tune the attachment position of the lower end of the shoulder strap while the school bag is being worn. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Utility Model Registration No. 3133399 [Patent Document 2] Japanese Patent Application Publication No. 4-15417 Summary of the Invention [Problem to be solved by the invention]

[0006] The inventors of the present application have conducted extensive research into a configuration that will make it easier to put on and take off the backpack straps when the user puts the backpack on or removes it from the back, and that will allow the entire back support of the backpack main body to fit more closely to the user's back when the backpack is worn.As a result, they have developed an attachment structure for the backpack straps that is easier to put on and take off, and provides even better fit after wearing than the school bag described in Patent Document 2.

[0007] Therefore, the present invention aims to provide a shoulder strap mounting structure for backpacks such as school bags and rucksacks, which can further improve the ease of fastening and detaching the shoulder strap when the backpack body is carried on the user's back or removed from the user's back, and which is configured to make it easier for the entire back support of the backpack body to come into contact with the user's back even when the backpack is worn, thereby ensuring a good wearing condition with a higher degree of adhesion. [Means for solving the problem]

[0008] In order to solve the above problems, the mounting structure for a carrying belt of the present invention is a mounting structure for a carrying belt in a backpack comprising a backpack main body having an internal storage section and a backrest section at the front that is supported in contact with the user's back, and a pair of left and right carrying belts that are hung around the user's left and right shoulders to allow the backpack main body to be carried, and whose upper ends are supported on the upper part of the backrest section and whose lower ends are supported on the bottom of the backpack main body. The mounting structure for a carrying belt in a backpack comprises: a backpack main body having an internal storage section and a backrest section at the front that is supported in contact with the user's back, and a pair of left and right carrying belts that are hung around the user's left and right shoulders to allow the backpack main body to be carried, and whose upper ends are supported on the upper part of the backrest section and whose lower ends are supported on the bottom of the backpack main body. The mounting structure for a carrying belt in a backpack comprises a pair of first adjustment sections at the bottom of the backpack main body that allow the support position at which the lower ends of the pair of carrying belts are supported at the bottom to be changed along a specified direction, and a pair of second adjustment sections that support each of the pair of first adjustment sections in a swingable manner.

[0009] In the mounting structure for the shoulder belt of the present invention, it is preferable that the second adjustment part has a retaining structure capable of retaining the position of the first adjustment part after it has swung.

[0010] In the mounting structure of the shoulder belt of the present invention, the pair of first adjustment parts each include a connecting ring to which the lower ends of the pair of shoulder belts are respectively joined, an elastic body having an elastic force that urges the connecting ring rearward, and a first guide path that determines the movement direction of the connecting ring, and the support position of the first adjustment parts corresponds to the position of the connecting ring, and the pair of second adjustment parts each include a pair of support parts that rotatably support a rotating shaft extending from the rear ends of the main body parts of the pair of first adjustment parts, and a pair of second guide paths into which an axis part extending from the front end side of the main body parts of the first adjustment parts is inserted and which guide the axis part, and it is preferable that the pair of second adjustment parts each swing relative to the pair of first adjustment parts as the rotating shaft rotates relative to the support parts.

[0011] In the mounting structure of the shoulder belt of the present invention, the retaining structure is preferably composed of an axis portion and a second guide path, each of the pair of first adjustment parts oscillates while sliding the outer peripheral surface of the axis portion against the inner surface of the second guide path, and the retaining structure retains the position of the first adjustment parts relative to the second adjustment parts by the contact resistance between the outer peripheral surface of the axis portion and the inner surface of the second guide path when the oscillation stops.

[0012] In the mounting structure for the shoulder belt of the present invention, the pair of second adjustment parts preferably support the pair of first adjustment parts so as to be able to swing independently of each other.

[0013] In the mounting structure for the shoulder belt of the present invention, it is preferable that each of the pair of second guide paths is formed along an arc extending outward in the left-right direction from the reference position up to a predetermined angle with respect to the support portion.

[0014] In the mounting structure for the shoulder belt of the present invention, the reference position is preferably provided at a position corresponding to the support part in the left-right direction, and the predetermined angle is preferably 15 degrees or more and 75 degrees or less.

[0015] In the shoulder belt mounting structure of the present invention, the elastic body is preferably a coil spring having an elastic force tending to contract. Effect of the Invention

[0016] According to the present invention, after adjusting the length of the upper belt and the lower belt of the pair of shoulder straps, the position of the connecting ring of each shoulder strap can be changed in the front-back direction, the left-right direction, and any direction between these directions, which further improves the ease of fastening and detachment of the shoulder strap and realizes a high degree of adhesion to the user's back. Furthermore, since the left and right shoulder straps can be operated in different directions, the ease of fastening and detachment can be further improved according to the usage environment, the dominant hand of the user, preferences, etc. [Brief description of the drawings]

[0017] [Figure 1] 1 is an overall perspective view of a school bag equipped with a shoulder strap mounting structure according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a bottom view of the school bag shown in FIG. [Diagram 3] 2A is a plan view of a first adjustment part in the school bag shown in FIG. 1, and FIG. 2B is a plan view showing the internal configuration of the first adjustment part shown in FIG. [Figure 4]2 is a perspective view showing the relationship between a left connecting ring, a first adjustment part, and a second adjustment part in the school bag shown in FIG. 1. FIG. [Diagram 5] FIG. 2A is a bottom view showing the configurations of the first and second adjustment sections on the left side, and FIG. 2B is a bottom view showing the configurations of the first and second adjustment sections on the right side. [Figure 6] (a) is a plan view showing the state in which the first adjustment part on the left side and the second adjustment part on the left side are opposed to each other, (b) is a plan view showing the state in which the first adjustment part on the left side is engaged with the second adjustment part on the left side, (c) is a plan view showing the state in which the connecting ring has been moved toward the front end side from the state in (b), and (d) is a cross-sectional view showing the state in which the first adjustment part has been swung relative to the second adjustment part from the state in (c). [Figure 7] 6(a) is a cross-sectional view taken along line 7A-7A' in FIG. 6(a), (b) is a cross-sectional view taken along line 7B-7B' in FIG. 6(b), (c) is a cross-sectional view taken along line 7C-7C' in FIG. 6(c), and (d) is a cross-sectional view taken along line 7D-7D' in FIG. 6(d). [Figure 8] FIG. 2 is a side view showing the backpack shown in FIG. 1 when worn on the back. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The following describes the mounting structure of the shoulder belt according to the embodiment of the present invention with reference to the drawings. In the following description, an example is given in which the mounting structure of the shoulder belt of the present invention is applied to a school bag, but the mounting structure of the shoulder belt of the present invention is not limited to school bags, and can also be applied to backpacks and other backpacks (knapsacks), for example.

[0019] FIG. 1 is an overall perspective view of a school bag 11 equipped with a shoulder strap mounting structure according to this embodiment. FIG. 2 is a bottom view of the school bag 11 shown in FIG. 1. FIG. 3(a) is a plan view of the first adjustment section in the school bag 11, and FIG. 3(b) is a plan view showing the internal structure with the top cover of the first adjustment section 40A shown in FIG. 3(a) removed. FIG. 4 is a perspective view showing the relationship between the left connecting ring 31A, the first adjustment section 40A, and the second adjustment section 50A in the school bag 11, FIG. 5(a) is a bottom view showing the respective configurations of the left first adjustment section 40A and the second adjustment section 50A, and FIG. 5(b) is a bottom view showing the respective configurations of the right first adjustment section 40B and the second adjustment section 50B. FIG. 2 and FIG. 3(a) show the state in which no force is applied to the shoulder strap. In the following description, the backrest 13 side of the school bag 11 (lower side in FIG. 2) will be referred to as the front, the cover plate 16 side (upper side in FIG. 2) as the rear, the left side in FIG. 2 as the leftward direction, and the right side as the rightward direction.

[0020] As shown in FIG. 1, the school bag 11 serving as a backpack has a backpack body 15, which has a flat back support 13 that closely contacts and supports the back 12a of the user 12 as shown by the solid line in FIG. 8, and a storage section 14 inside that is carried on the back 12a of the user 12.

[0021] The backpack body 15 is box-shaped overall, and the top of the internal storage section 14 can be opened by opening the cover plate 16 in the direction of arrow A in Fig. 1, making it possible to store textbooks, school supplies, etc. in the storage section 14. The school bag 11 is equipped with a pair of shoulder straps on the left and right sides, which are looped around the left and right shoulders of the user 12 so that the backpack body 15 is carried on the back, with their upper ends supported above the back support 13 of the backpack body 15 and their lower ends supported by the back support 13 of the backpack body 15.

[0022] The left shoulder strap comprises an upper strap 17A, the upper end of which is fastened to a connector 19A provided on the upper side of the back support portion 13 of the backpack main body 15, and a lower strap 18A, the lower end of which is supported by the lower part of the back support portion 13 of the backpack main body 15.

[0023] Similar to the left shoulder strap, the right shoulder strap comprises an upper belt 17B and a lower belt 18B, with the upper end of the upper belt 17B being connected to a connector 19B. The upper belts 17A, 17B and the lower belts 18A, 18B correspond to the size of the shoulders of the user 12 to be wrapped around, and the joining positions of the upper belts 17A, 17B and the lower belts 18A, 18B can be changed and connected to each other so that the length can be adjusted.

[0024] As described above, the pair of upper belts 17A, 17B are each arranged on the upper side of the backrest 13 of the backpack main body 15, and their upper ends are connected and joined to the supported connectors 19A, 19B. The connectors 19A, 19B provided on the left and right sides can each face forward with the upper center of the backrest 13 as a reference.

[0025] In the left shoulder strap, the lower end of the upper belt 17A and the upper end of the lower belt 18A are connected by inserting the lower end of the upper belt 17A into a buckle-shaped ring body 20A supported on the upper end of the lower belt 18A, and fastening and connecting any length position on the lower end side of the upper belt 17A to the ring body 20A.

[0026] The right shoulder belt has a similar configuration to the left shoulder belt, and the lower end of upper belt 17B is connected to the upper end of lower belt 18B by inserting the lower end of upper belt 17B through a buckle-shaped ring body 20B supported on the upper end of lower belt 18B, and fastening and connecting any length position on the lower end side of upper belt 17B to ring body 20B.

[0027] A fastening needle 21A is supported on the ring 20A for the left shoulder strap, and a plurality of fastening holes 22A are formed at a predetermined interval in the length direction on the lower end side of the upper belt 17A. The fastening needle 21A of the ring 20A is fastened to the fastening hole 22A at an arbitrary position of the upper belt 17A, so that the fastening connection position of the lower end of the upper belt 17A inserted through the ring 20A to the ring 20A can be changed. This connection makes it possible to connect the upper belt 17A and the lower belt 18A to each other in an adjustable length, and makes it possible to adjust the overall length of the left shoulder strap to the size of the shoulder of the user 12.

[0028] The right shoulder belt is similar to the left shoulder belt, with a fastening needle 21B supported on the ring 20B, and a plurality of fastening holes 22B at a predetermined interval along the length of the lower end of the upper belt 17B. By fastening the fastening needle 21B of the ring 20B to the fastening hole 22B at any position of the upper belt 17B, the fastening joint position of the lower end of the upper belt 17B inserted through the ring 20B relative to the ring 20B becomes variable, so that the upper belt 17B and the lower belt 18B can be connected to each other in an adjustable length, and the overall length of the right shoulder belt can be adjusted to fit the size of the shoulder of the user 12.

[0029] 2, a tension band 23 extends from the lower end of the cover plate 16, and a buckle 24 is rotatably attached to the tip of the tension band 23. The buckle 24 is configured to be detachable from a male part (not shown) provided at the bottom of the storage section 14 according to the rotational position. With this configuration, depending on the rotational position of the buckle 24, the cover plate 16 can be selected between a state in which it is fixed by the buckle 24 and closed, and a state in which it can be separated from the buckle 24 and opened.

[0030] As shown in Fig. 2, a pair of first adjustment parts 40A, 40B and a pair of second adjustment parts 50A, 50B are provided on the bottom surface 15a of the backpack body 15 on both the left and right sides of the buckle 24. The pair of first adjustment parts 40A, 40B have the same shape and have an elliptical outer shape in a plan view. The pair of second adjustment parts 50A, 50B have shapes that are symmetrical to each other and are arranged symmetrically to each other on the bottom surface 15a of the school bag 11.

[0031] <First adjustment section 40A, 40B> 2, the left first adjustment part 40A includes a main body part 41A provided with a guide hole 42A as a first guide path that determines the moving direction of the left connecting ring 31A. The guide hole 42A extends along the long axis direction (a predetermined direction, the up-down direction in FIG. 3(a)) of the main body part 41A that has an elliptical shape in a plan view.

[0032] The right first adjustment part 40B includes a main body part 41B provided with a guide hole 42B as a first guide path that defines the moving direction of the right connecting ring 31B. The guide hole 42B extends along the major axis direction of the main body part 41B that has an elliptical shape in a plan view.

[0033] Next, for the left first adjustment part 40A, the relationship with the corresponding connecting ring 31A and spring 47A will be described. The right first adjustment part 40B is similar to the left first adjustment part 40A, so the description will be omitted.

[0034] As shown in Fig. 4, a shaft 32A extends from the left connecting ring 31A, and the shaft 32A is inserted into the guide hole 42A so as to penetrate the main body 41A in the thickness direction, and a stop plate 46A having a planar shape larger than the width of the guide hole 42A is fixed to the tip (upper end) of the shaft 32A (see Fig. 3(a) and Figs. 7(a) to (d)). The stop plate 46A is disposed on the upper side of the main body 41A (the back side of the main body 41A when viewed from the connecting ring 31A side), so that the connecting ring 31A does not come off the guide hole 42A and can move along the direction D11 or direction D12 in which the guide hole 42A extends.

[0035] As shown in Figure 3(a) and Figures 7(a)-(d), shaft 43A is fixed to the upper side of retaining plate 46A so as to share a common central axis with shaft 32A. One end of spring 47A serving as an elastic body is fixed to the tip of shaft 43A, and the other end of spring 47A is fixed to main body 41A. Spring 47A is a coil spring.

[0036] When no force is being applied from the lower belt 18A of the backpack belt, the elastic force of the spring 47A tends to contract, causing the stop plate 46A to be positioned at the rearmost position (the rear end 45A side) in the guide hole 42A. Therefore, the elastic force of the spring 47A biases the connecting ring 31A, which is integrated with the stop plate 46A via the shaft 43A, rearward, and the connecting ring 31A is positioned at the rear end 45A side of the main body 41A.

[0037] On the other hand, when the user 12 operates the backpack belt when putting on or taking off the backpack 11, the spring 47A expands according to the operating force, and the stop plate 46A and the connecting ring 31A, which are integrated, move toward the front end 44A in the guide hole 42A. Therefore, the elastic force of the spring 47A makes it possible to change the distance between the backpack belt and the backpack body 15.

[0038] The material constituting the pair of main body portions 41A, 41B is preferably selected taking into consideration the elastic force of the built-in spring, the durability and rigidity against movement of the pair of connecting rings 31A, 31B, the durability against swinging relative to the pair of second adjustment portions 50A, 50B, and the weight and weight balance of the entire school bag 11, and may be made of, for example, a hard synthetic resin or a lightweight metal such as aluminum.

[0039] <Second adjustment section 50A, 50B> As shown in FIG. 4, the second adjustment unit 50A on the left side is provided with a guide hole 52A as a second guide path and a support hole 53A as a support unit, which are provided in a fixing plate 51A having a substantially fan-shaped shape in a plan view, and which penetrate the plate in the thickness direction. As shown in FIG. 4 or FIG. 5(a), the guide hole 52A is formed along an arc centered on the center of the support hole 53A, and determines the swing direction of the first adjustment unit 40A on the left side when the first adjustment unit 40A is rotatably supported by the support hole 53A. A rotation shaft 48A extending from the bottom of the first adjustment unit 40A is inserted into the support hole 53A, and the rotation shaft 48A is rotatably supported by the support hole 53A. The rotation shaft 48A is provided at one end 45A in the major axis direction of the first adjustment unit 40A having an elliptical shape in a plan view, so as to extend upward (toward the second adjustment unit 50A).

[0040] The other end 44A in the long axis direction of the first adjustment unit 40A is provided with a shaft portion 49A extending parallel to the rotation shaft 48A. This shaft portion 49A is inserted into the guide hole 52A, and when the rotation shaft 48A rotates while being inserted into the support hole 53A, the shaft portion 49A slides and moves within the guide hole 52A. As a result, the first adjustment unit 40A swings in the direction D13 or D14 relative to the second adjustment unit 50A in accordance with the rotation of the rotation shaft 48A (see FIG. 4). Therefore, the angular range of the swing of the first adjustment unit 40A is determined by the range in which the guide hole 52A is provided. Furthermore, shaft portion 49A slides within guide hole 52A; that is, shaft portion 49A moves while the outer surface of shaft portion 49A and the inner surface of guide hole 52A are in sliding contact with each other between shaft portion 49A as a holding structure and guide hole 52A. Therefore, when the movement of shaft portion 49A is stopped, its position is maintained by the contact resistance due to the sliding contact with guide hole 52A.

[0041] As shown in FIG. 5(b), in the same manner as the second adjustment unit 50A on the left side, the second adjustment unit 50B on the right side has a guide hole 52B as a second guide path and a support hole 53B as a support portion, which are provided in a fixing plate 51B having a generally fan-shaped shape in a plan view, and which penetrate the fixing plate 51B in the thickness direction. The guide hole 52B is formed along an arc centered on the center of the support hole 53B, and when the first adjustment unit 40B on the right side is rotatably supported by the support hole 53B, it determines the swing direction of the first adjustment unit 40B. As in the case of the second adjustment unit 50A on the left side, a rotation shaft (not shown) extending from the bottom of the first adjustment unit 40B is inserted into the support hole 53B, and the rotation shaft is rotatably supported by the support hole 53B. The rotation shaft is provided to extend upward (toward the second adjustment unit 50B) at one end 45B in the major axis direction of the first adjustment unit 40B having an elliptical shape in a plan view, similar to the rotation shaft 48A of the right second adjustment unit 50A. Each part of the right second adjustment unit 50B is provided to form a pair with each part of the left second adjustment unit 50A.

[0042] The other end 44B in the long axis direction of the first adjustment part 40B is provided with an axis part 49B extending therefrom, similar to the axis part 49A of the second adjustment part 50A on the right side. This axis part 49B is inserted into the guide hole 52B, and when a rotation shaft (not shown) provided at one end 45B rotates while being inserted into the support hole 53B, it moves while sliding within the guide hole 52B. As a result, the first adjustment part 40B swings relative to the second adjustment part 50B in accordance with the rotation of the rotation shaft. As a result, the angular range of the swing of the first adjustment part 40B is regulated by the range in which the guide hole 52B is provided. Furthermore, when the axis part 49B stops within the guide hole 52B, its position is held by sliding contact with the guide hole 52B, and the axis part 49A and the guide hole 52A function as a holding structure.

[0043] 5(a), the left guide hole 52A is formed in the second adjustment part 50A at an angle θ (a predetermined angle) with respect to the center of the support hole 53A. This angle θ is an angle that starts from the innermost (right side) reference position P11 on the bottom surface 15a as the bottom part of the school bag 11 and reaches the leftmost maximum angle position P12. The reference position P11 is a position that corresponds to the center of the support hole 53A in the left-right direction.

[0044] 5(b), the right guide hole 52B is formed in the second adjustment part 50B so as to form the same angle θ (predetermined angle) with the left guide hole 52A with respect to the center of the support hole 53B. This angle θ is the angle that starts from the innermost (left side) reference position P21 on the bottom surface 15a of the school bag 11 to the leftmost maximum angle position P22. The reference position P21 is the position that corresponds to the center of the support hole 53B in the left-right direction.

[0045] Since the second adjustment parts 50A, 50B are disposed symmetrically on the bottom surface 15a, the guide holes 52A, 52B are also provided symmetrically, and the first adjustment parts 40A, 40B are each capable of swinging within the range of angle θ.

[0046] The reference positions P11 and P21 are positions corresponding to the support holes 53A and 53B in the left-right direction, but are not limited to these positions and may be located closer to each other or farther away from each other. However, from the viewpoint of ease of handling the shoulder straps of the backpack 11, it is preferable to locate them at the same positions as the reference positions P11 and P21 or further outboard.

[0047] 5(a) and 5(b), respectively. However, in consideration of the operability of the shoulder straps of the backpack 11, it is preferable that the maximum angle positions P12 and P22 are positions outside the positions corresponding to the support holes 53A and 53B in the left-right direction, but not extending along the left-right direction.

[0048] Considering the balance between the freedom of movement of the user 12 when putting on and taking off the school bag 11 and the inconvenience caused by an angle θ that is too large, it is preferable that the reference positions P11, P21 and the maximum angle positions P12, P22 are in the range from the positions corresponding to the support holes 53A, 53B in the left-right direction to positions along the left-right direction, and that the angle θ is in the range of 15 degrees or more and 75 degrees or less, and further, a range of 20 degrees or more and 50 degrees or less is more preferable in terms of the balance between ease of putting on and taking off and operability.

[0049] The material constituting the pair of fixed plates 51A, 51B is preferably selected taking into consideration the durability and rigidity of the first adjustment parts 40A, 40B against the swinging motion, the weight and weight balance of the entire school bag 11, etc., and like the main body parts 41A, 41B of the first adjustment parts 40A, 40B, it is preferable to construct them from, for example, a hard synthetic resin or a lightweight metal such as aluminum.

[0050] Next, the engagement between the left-side first adjustment part 40A and the left-side second adjustment part 50A, the movement of the left-side connecting ring 31A relative to the left-side first adjustment part 40A, and the swinging of the left-side first adjustment part 40A relative to the left-side second adjustment part 50A will be explained using Figures 6(a), (b), (c) and Figures 7(a), (b), (c).

[0051] The engagement between the right-side first adjustment part 40B and the right-side second adjustment part 50B, the movement of the right-side connecting ring 31B (shaft portion 32B) relative to the right-side first adjustment part 40B, and the oscillation of the right-side first adjustment part 40B relative to the right-side second adjustment part 50B are similar to those of the left-side first adjustment part 40A, second adjustment part 50A, and connecting ring 31A, and therefore will not be described. The first adjustment unit 40A, the second adjustment unit 50A, and the connecting ring 31A on the left side and the first adjustment unit 40B, the second adjustment unit 50B, and the connecting ring 31B on the right side can operate separately and independently.

[0052] Fig. 6(a) is a plan view showing a state in which the first adjustment part 40A on the left side and the second adjustment part 50A on the left side are opposed to each other, and Fig. 7(a) is a cross-sectional view taken along line 7A-7A' in Fig. 6(a). Fig. 6(b) is a plan view showing a state in which the first adjustment part 40A is engaged with the second adjustment part 50A, and Fig. 7(b) is a cross-sectional view taken along line 7B-7B' in Fig. 6(b). Fig. 6(c) is a plan view showing a state in which the coupling ring 31A has been moved from the state shown in Fig. 6(b) toward the front end part 44A, and Fig. 7(c) is a cross-sectional view taken along line 7C-7C' in Fig. 6(c). 6(a), (b), and (c), the first adjustment part 40A is not swung relative to the second adjustment part 50A, and the positions of the lines 7A-7A', 7B-7B', and 7C-7C' in the second adjustment part 50A are the same, and each line passes through the center of the guide hole 52A in the width direction and is aligned along the extension direction.

[0053] Fig. 6(d) is a cross-sectional view showing a state in which the first adjustment part 40A has been swung relative to the second adjustment part 50A from the state shown in Fig. 6(c), and Fig. 7(d) is a cross-sectional view taken along line 7D-7D' in Fig. 6(d). Line 7D-7D' passes through the center of the guide hole 52A in the width direction and is aligned along the extension direction. Note that the spring 47A is not shown in Figs. 7(a), (b), (c), and (d).

[0054] As shown in Figures 6(a) and 7(a), the first adjustment unit 40A is disposed opposite the second adjustment unit 50A so that the rotation shaft 48A and the support hole 53A correspond to each other and the shaft portion 49A can be inserted into the guide hole 52A. From this state, as shown in Figures 6(b) and 7(b), the first adjustment unit 40A is moved toward the second adjustment unit 50A so that the rotation shaft 48A is disposed in the support hole 53A and the shaft portion 49A is disposed in the guide hole 52A, respectively, and the bottom surface of the main body portion 41A of the first adjustment unit 40A and the top surface of the fixed plate 51A of the second adjustment unit 50A are disposed so as to be in contact with or close to each other.

[0055] As a result, the pivot shaft 48A of the first adjustment part 40A is rotatably supported by the support hole 53A, and the first adjustment part 40A can swing around the support hole 53A. When the first adjustment part 40A swings, the shaft part 49A moves while sliding within the guide hole 52A, and the swing range of the first adjustment part 40A is defined by the range in which the guide hole 52A is provided.

[0056] As shown in Figures 6(c) and 7(c), the connecting ring 31A can be moved forward along direction D11 from the state shown in Figures 6(b) and 7(b). As a result, the shoulder belt connected to the connecting ring 31A moves forward, creating space between the backrest 13 of the school bag 11 and the back 12a of the user 12.

[0057] As shown in Figures 6(d) and 7(d), the connecting ring 31A can be moved outward from the state shown in Figures 6(c) and 7(c) along direction D13, i.e., the first adjustment part 40A can be swung outward. This causes the lower belt 18A of the shoulder belt connected to the connecting ring 31A to move outward, widening the gap between the armpits of the user 12 and the shoulder belt, making it easier to put on and take off the shoulder belt.

[0058] FIG. 8 is a side view showing the backpack 11 shown in FIG. 1 being worn on the back. For example, when user 12 pulls the pair of shoulder straps forward with back support 13 against his / her back 12a, the pair of connecting rings 31A, 31B move forward (toward back support 13) against the elastic force of spring 47A. When user 12 pulls the shoulder straps diagonally forward, first adjustment parts 40A, 40B swing in a direction corresponding to the pulling direction, and the pair of connecting rings 31A, 31B move forward according to the magnitude of the pulling force of user 12. That is, the support positions where lower straps 18A, 18B of the shoulder straps are supported on bottom surface 15a of school bag 11 are changed in the front-rear direction. Here, when user 12 pulls the left and right shoulder straps in different ways, first adjustment parts 40A, 40B swing according to the pulling force and direction applied to each shoulder strap, and connecting rings 31A, 31B move respectively.

[0059] Furthermore, when the user 12 pulls the shoulder strap outward in the left-right direction, or diagonally forward in a direction that exceeds the swing range of the first adjustment parts 40A, 40B, the first adjustment parts 40A, 40B swing to maximum angle positions P12, P22, and the pair of connecting rings 31A, 31B move toward the front end 44A according to the magnitude of the pulling force of the user 12. In other words, the support position at which the lower straps 18A, 18B of the shoulder strap are supported on the bottom surface 15a of the school bag 11 can be changed in either the front-rear or left-right direction.

[0060] In this way, the swinging of first adjustment parts 40A, 40B and the movement of connecting rings 31A, 31B occur in conjunction with each other when user 12 operates each of the left and right shoulder straps, so user 12 can freely operate the left and right shoulder straps separately from each other to adjust the front-to-rear positions of the left and right shoulder straps and the distance between backpack main body 15 and the shoulder straps depending on the situation, for example, a situation in which another baggage is being held in one hand, a situation in which the left and right shoulder straps cannot be operated equally due to the surrounding environment, etc. Therefore, user 12 can form a desired distance between the shoulder straps and backpack main body 15 in a desired direction, so that user 12 can easily put on or take off school bag 11 in a posture desired by user 12 (the state shown by the dashed line in FIG. 7).

[0061] On the other hand, when the pulling force of the shoulder strap is released, the outer circumferential surfaces of the shafts 49A, 49B of the first adjustment parts 40A, 40B slide against the inner surfaces of the corresponding guide holes 52A, 52B, stopping the swing of the first adjustment parts 40A, 40B relative to the second adjustment parts 50A, 50B, respectively, and maintaining the positions of the shafts 49A, 49B. Furthermore, in the left first adjustment part 40A, the elastic force of the spring 47A returns the connecting ring 31A to the rear end 45A side, and although not shown, in the right first adjustment part 40B, the connecting ring 31B similarly returns to the position of the rear end 45A side. These actions allow the pair of shoulder straps to be closely attached to the chest 12b of the user 12, making it possible to increase the degree of close contact between the back 12a of the user 12 and the back support part 13 (the state shown by the solid line in FIG. 7).

[0062] Here, the sliding contact strength as the holding strength can be adjusted by changing the configuration of the surfaces that slide against each other between the shafts 49A, 49B and the guide holes 52A, 52B as the holding structure. For example, the holding strength may be set low for lower grades of elementary school, and the first adjustment parts 40A, 40B and second adjustment parts 50A, 50B with higher holding strength may be interchangeable for upper grades of elementary school.

[0063] In addition, in the above-described configuration, spring 47A (the spring on the right side is not shown), which is a coil spring, is used in first adjustment parts 40A, 40B. However, as long as it is possible to bias the pair of connecting rings 31A, 31B rearward, it is also possible to use an elastic body other than a coil spring, such as a rubber material, a plastic material, or a spring of a type other than a coil spring. Although the present invention has been described with reference to the above-mentioned embodiment, the present invention is not limited to the above-mentioned embodiment, and improvements or modifications can be made within the scope of the present invention or the purpose of the improvements. [Explanation of symbols]

[0064] 11 Backpack 12 User 12a Back 12b chest 13 Backrest 14 Storage area 15 Backpack body 15a Bottom 16 Lid plate 17A Left shoulder strap, upper belt 17B Right upper belt 18A Left shoulder strap 18B Right shoulder strap 19A, 19B combination 20A, 20B ring body 21A, 21B Fastening needle 22A, 22B fixing hole 23 Tensile belt 24 Buckle 31A, 31B connecting ring 32A, 32B shaft part 40A First adjustment part on the left 40B First adjustment part on the right side 41A, 41B Main body 42A, 42B Guide hole (first guide path) 43A Shaft 44A, 44B Front end 45A, 45B Rear end 46A Stop plate 47A Spring (elastic body) 48A Rotating shaft 49A, 49B Shaft (holding structure) 50A Second adjustment part on the left 50B Second adjustment part on the right side 51A, 51B Fixed plate 52A, 52B Guide hole (second guide path, holding structure) 53A, 53B Support hole (support part) P11, P21 reference position P12, P22 maximum angular position

Claims

1. A backpack body having a storage section therein and a back support section at the front side thereof that is supported by contacting the back of a user; A pair of left and right shoulder belts are wrapped around the left and right shoulders of a user so that the backpack body is carried on the user's back, and the upper ends of the shoulder belts are supported by the upper part of the back support and the lower ends of the shoulder belts are supported by the bottom of the backpack body; A mounting structure for a shoulder strap in a backpack comprising: A shoulder strap mounting structure characterized in that a pair of first adjustment parts are provided at the bottom of the backpack body, which enable the support positions at which the lower ends of the pair of shoulder straps are supported at the bottom to be changed along a predetermined direction, and a pair of second adjustment parts are provided to support the pair of first adjustment parts, respectively, in a swingable manner.

2. 2. The shoulder belt mounting structure according to claim 1, wherein the second adjustment section has a retaining structure capable of retaining the position of the first adjustment section after it has been swung.

Images