JP2000023732A - Knapsack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a knapsack the product control of which can be easily performed by assuredly preventing the loss of the shape of an opening in the upper surface of a main housing part, lowering a cost with easy manufacture and reducing the number of parts. SOLUTION: A knapsack A comprises a back plate 1, a front plate 2, a bottom plate 3 and both side plate 4 provided between the back plate 1 and the front plate 2 and a main housing part 6 opened 5 in its upper surface by connecting the outer peripheral edges 1a and 2a of the back plate 1 and the front plate 2 and the front and back end edges 3a, 3b and 4a and 4b of the bottom plate 3 and both the side plates 4 together by sewing. Bag shaped parts 16, and 17 are provided inside surface skins 14 with which the outer surfaces of the front plate 2 and both the side plates 4 are covered near to the edge of the opening 5. In the bag shaped parts 16 and 17, leaf springs 18a and 18b of circular sections made of metal strips are provided so that their protruding surfaces are directed outward. Parts near the edge of the opening 5 except the back plate side are surrounded by the leaf springs 18a and 18b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a school bag for schoolchildren or the like to store school supplies.

[0002]

2. Description of the Related Art Conventionally, a backpack has a bottom plate portion and both side plate portions disposed between a back plate portion and a front plate portion, and the outer peripheral edges of the back plate portion and the front plate portion, the bottom plate portion, and both side plate portions. A main accommodating portion having an open upper surface is formed by sewing the front and rear edges together. By the way, there are many chances that the school bag is repeatedly pushed from behind or from the side while it has been used for many years, and it naturally collapses, and the opening is crushed or the both side plates are bent outward with this. Since it is difficult to insert school supplies and the appearance is poor, the shape of the opening is particularly prevented from being deformed to maintain the overall shape retention.
There is a school bag according to JP-A-21 or JP-A-8-280436.

[0003] In the former school bag, the main compartment is formed by overlaying a large partition fabric and a gore fabric on the outer surfaces of both sides and a front portion of the main compartment base material, and laminating a backing fabric on the inner surface. ing. Then, the front portion from one side portion, between the main storage portion base material and the backing fabric, or between the main storage portion base material and the large partition outer surface and the gore outer surface at the upper end of the side portion and the front portion. A flat U-shaped synthetic resin bead that reaches the other side surface through the stitch is inserted and sewn to reinforce the opening edge of the main housing portion.

In the latter, the front wall and the rear wall are sewn to each other via a gusset wall to form a square mouth, and the inner peripheral surface of the rim of the both gusset walls is formed. A gusset reinforcing plate made of synthetic resin is additionally provided, and a back reinforcing plate made of synthetic resin is provided on the inner peripheral surface of the edge of the back wall, and the gusset reinforcing plate and the back reinforcing plate are surface-joined to each other. The connecting piece is configured to protrude from either one. The gusset reinforcing plate, the back reinforcing plate, and the connecting pieces are all connected and fixed by many rivets.

[0005]

However, in the case of the former school bag, in order to sew the bead on the both sides and the upper end of the front part, it is necessary to superimpose an extra large partition surface or gore surface. In addition to the complicated structure, the production is troublesome, the production cost is high, and the number of parts is large, so that there is a problem that the product management becomes complicated. In addition, since the bead is employed to reinforce the opening edge of the main accommodating portion, the bead must be made of relatively hard synthetic resin. There is a possibility that the opening edge may be deformed without being returned to the original shape and the opening edge may be deformed on the contrary, which is not sufficient to achieve the intended purpose.

Further, even in the latter case, the gusset reinforcing plate and the back reinforcing plate must be superposed one on the other, and the structure becomes complicated, such as riveting, so that the production is not only complicated but also complicated. However, there is a problem that the production cost becomes high and the production management becomes complicated due to the large number of parts. Both the gusset reinforcing plate and the connecting piece must be made of relatively hard synthetic resin. In particular, since the connecting piece is formed by being bent at substantially 90 degrees from the gusset reinforcing plate or the back reinforcing plate, a strong pressing force is obtained. If the gusset reinforcing plate is repeatedly received, the gusset reinforcing plate may not be returned to the original shape, may remain bent, and the mouth may be deformed,
Furthermore, there is a risk that the connecting piece may break.

Accordingly, the present invention has been made in view of the above problems, and can be applied to a conventional school bag as it is, and since the structure is simple, it can be easily manufactured, the manufacturing cost can be reduced, and the number of parts is small. It is an object of the present invention to provide a school bag which is easy to manage products, has excellent resilience against repeated pressing force, and can surely prevent the opening of the main housing portion from being deformed.

[0008]

In order to achieve the above object, a school bag according to the present invention comprises a bottom plate and both side plates disposed between a back plate and a front plate, and the back plate, the front plate and the front plate. An outer edge of a plate portion and a bottom plate portion, and front and rear end edges of both side plate portions are integrally sewn together to form a main housing portion having an open upper surface; A bag-shaped portion is provided inside the outer skin covering the outer surfaces of the two side plate portions, and a leaf spring having an arc-shaped cross section made of a metal strip is provided inside the bag-shaped portion so that its convex surface faces outward. The edge of the opening except the back plate side was surrounded by the leaf spring.

As described above, the school bag according to the present invention has a configuration in which a bag-shaped portion is provided on the front plate portion and both side plate portions forming the main accommodating portion, and a leaf spring is simply inserted through the bag-shaped portion. The structure is extremely simple and not only easy to manufacture, but also applicable to conventional school bags. The leaf spring bends relatively freely on the concave side like a steel tape measure, but the convex side exerts rigidity up to a certain force and is hardly bent, and also has a restoring force against repeated loads. Rich. Therefore,
Because it is rich in restoring force even if it receives strong pressing force repeatedly,
It is excellent in shape retention such that it immediately returns to its original shape, whereby it is possible to reliably prevent the shape of the opening of the school bag from being lost, and there is no hindrance to taking in and out of school supplies.

[0010] The leaf springs are disposed on the front plate portion side and the respective side plate portion sides so as to be separated from each other by three. It may be disposed separately in two such that the tip portions overlap, or may be disposed so as to be continuous with the front plate portion side and the both side plate portion side, and thereby, particularly, each side plate portion may be provided. The leaf spring straddles the corner where the front edge of the front plate overlaps the outer peripheral edge of the front plate portion, and this corner is very strong and has excellent durability.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a school bag according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a school bag to which the present invention is applied. The school bag A is
Bottom plate 3 and both side plates 4, 4 between back plate 1 and front plate 2
And outer peripheral edges 1a, 2 of the back plate portion 1 and the front plate portion 2.
a and the bottom plate 3, the rear edges 3a, 4a and the front edges 3b, 4b of the side plates 4, 4 are integrally sewn together, and the main housing part 6 having a rectangular opening 5 on the upper surface is box-shaped. Is formed. Further, a cover 7 for opening and closing the opening 5 is integrally sewn to the upper edge of the back plate 1. Reference numerals 8 and 8 denote a pair of shoulder bands attached to the back surface of the back plate.

Reference numeral 9 denotes an auxiliary front plate disposed on the front side of the front plate 2, and a gusset 10 is disposed between the front plate 2 and both side edges and a lower edge of the auxiliary front plate 9. Then, by sewing together, an opening 11 is formed on the upper surface between the front plate portion 2 and the auxiliary front plate portion 9.
The sub accommodating portion 12 is formed. 13 is the sub-housing 1
2 is a partition plate for partitioning 2.

As shown in FIGS. 2 to 4, outer skins 14 and 1 are provided on outer surfaces of the front plate 2 and both side plates 4 and 4, respectively.
4 is superimposed and sewn. Then, the front plate portion 2 and both side plate portions 4, 4 are brought close to the edge of the opening 5 on the upper surface, and the outer cover 14,
Bag-shaped portions 16, 17, 17 for inserting a leaf spring 18, which will be described later, are provided by being sewn crosswise with two sewing threads 15, 15 separated from each other by a predetermined distance together with.

Reference numeral 18 denotes a leaf spring which is disposed so as to be inserted through the respective bag-shaped portions 16, 17, 17 of the front plate portion 2 and both side plate portions 4, 4. The leaf spring 18 is made of a metal strip having a thickness of about 0.2 mm, and has a circular cross section. The leaf spring 18 bends relatively freely on the concave side like a well-known steel tape measure. Rigidity is hard to bend up to a certain force on the side, and it is rich in restoring force against repeated loads. Therefore, even when repeatedly subjected to a strong pressing force, the shape is rich in the restoring force, and the shape is excellent in shape retention such as immediately returning to the original shape.

Therefore, in the present embodiment, the leaf spring 1
5 is divided into three leaf springs 18a, 18b and 18b so that the length of the front plate portion 2 is substantially equal to the lateral width of the side plate portions 4 and 4 as shown in FIG. In the second embodiment, as shown in FIG. 5B, the leaf springs 18 reach the front plate portion 2 from the side plate portions 4 and 4 and the tip portions overlap. , Two leaf springs 18c,
18c and the third embodiment, as shown in FIG. 5 (c), in which the front plate portion 2 and both side plate portions 4 and 4 are connected by a single wire. Yes.

Next, the procedure for inserting the leaf spring 18 in each case will be described step by step. First, leaf spring 1
In the case where 8 is formed of three leaf springs 18a, 18b, 18b, as shown in FIG. 6, the front plate portion 2 in which the sub-accommodating portion 12 is formed in advance, the both side plate portions 4, 4 and the bottom plate portion 3
Before the back plate 1 is sewn to the back plate 1, each plate corresponding to the width of each of the bag-like portions 16, 17, 17 on the front plate 2 side and both side plate portions 4, 4 side is provided. The springs 18a, 18b, 18b are inserted so that the convex surfaces face outward. In this state, the outer peripheral edge 2a of the front plate portion 2, the both side plate portions 4, 4 and the front end edges 4b, 3b of the bottom plate portion 3 are overlapped and sewn with a sewing thread 19, and furthermore, the both side plate portions 4, 4 and the bottom plate Rear edge 4a. 3a
The main housing 6 is formed as shown in FIG.

Thus, the leaf spring 18 whose convex surface faces outward is provided.
Since a, 18b and 18b surround the edge of the opening 5 excluding the back plate 1 side, even if a strong pressing force is repeatedly applied to the front plate 2 or the side plates 4, 4 from the outside thereof. The restoring force is applied by the spring action of each of the leaf springs 18a, 18b, 18b, so that the original shape is immediately returned to the original shape, and the opening 5 is not deformed. Will not come.

In the case of the second embodiment, as shown in FIG. 7, the leaf springs 18c, 18c are respectively inserted through the bag-like portion 16 on the front plate portion 2 side from both ends thereof in advance. These tips 18c-1 and 18c-1 are partially overlapped. When the both side plates 4 and 4 and the bottom plate 3 are sewn to the front plate 2 in the same manner as described above,
c, 18c are inserted into the bag-like portions 17, 17 on the side plate portions 4, 4 side. At this time, the two leaf springs 18c, 18c are integrally sewn with the sewing thread 19. Next, the both side plate portions 4 and 4 and the back plate portion 1 are sewn with a sewing thread 20, and also at this time, the rear ends 18c-2 and 18c-2 of the two leaf springs 18c and 18c are integrally sewn. You. As a result, as shown in FIG.
Is formed.

Further, in the case of the third embodiment, as shown in FIG. 9, the length of the portion protruding from both ends of the bag-like portion 16 on the front plate portion 2 side is made equal in advance.
Is inserted. When the both side plates 4 and 4 and the bottom plate 3 are sewn to the front plate 2 in the same manner as described above, the leaf spring 18 is integrally sewn with the sewing thread 19. Also, both side plate parts 4, 4
The back plate 1 is sewn with a sewing thread 20, and also at this time, the rear ends 18-1 and 18-1 of the leaf spring 18 are sewn together as described above. As a result, the main housing portion 6 is formed as shown in FIG.

Although the second and third embodiments have the same functions and effects as the present embodiment, the front edges 4b, 4b of the side plates 4, 4 and the front plate 2 The leaf springs 18c, 18c straddle the corner portions 21, 21 which overlap with the outer peripheral edge of the base member.
Is very durable and has excellent durability.

As shown in FIGS. 1 and 4, a partition plate 13 for partitioning the sub-accommodating portion 12 also has a front cover 1 on its front surface.
4, a bag-like portion 22 is provided inside the outer skin 14 along the upper edge thereof, and a leaf spring 18d cut to a required length is provided inside the bag-like portion 22 with its convex surface facing outward. You may do it. As a result, the partition plate 13 and the sub-housing 12
Will also increase the shape retention.

[0022]

As described above, in the school bag according to the present invention, the bag-like portion is provided on the inner side of the outer covering covering the outer surfaces of the front plate portion and the both side plate portions near the opening edge of the upper surface. A leaf spring having an arc-shaped cross section made of a metal strip is provided inside the portion so that its convex surface faces outward, and the edge of the opening except for the back plate side is surrounded by the leaf spring. It can be simply applied to a conventional school bag simply by inserting a leaf spring, and the structure is simple, the production is easy, and the production cost can be reduced. Also, since the number of parts is small, product management is easy. Furthermore, since it is very rich in resilience and excellent in shape-retaining property even against a repeatedly applied pressing force, it is possible to reliably prevent the opening of the main accommodating portion from being deformed.

[0023] In claims 2 and 3,
The leaf spring straddles the corner where the front edge of each side plate and the outer edge of the front plate overlap, so that this corner is very durable and has excellent durability, withstands long-term use and has a long service life. This has the effect.

[Brief description of the drawings]

FIG. 1 is a perspective view of a school bag to which the present invention is applied.

FIG. 2 is a plan cross-sectional view showing the main part.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is a sectional view taken along line YY of FIG. 2;

FIG. 5 is a perspective view of a leaf spring.

FIG. 6 is an explanatory diagram showing a procedure for installing the leaf spring according to the embodiment.

FIG. 7 is an explanatory diagram showing a procedure for installing a leaf spring according to another embodiment.

FIG. 8 is a plan cross-sectional view of the land cell showing the main part.

FIG. 9 is an explanatory diagram showing a procedure for installing a leaf spring according to another embodiment.

FIG. 10 is a plan cross-sectional view of a land cell showing the main part.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 back plate portion 1a outer peripheral edge 2 front plate portion 2a outer peripheral edge 3 bottom plate portion 3a rear end edge 3b front end edge 4,4 side plate portion 4a rear end edge 4b front end edge 5 opening 6 main accommodating portion 14, 14 outer skin 16 bag shape Part 17, 17 Bag-shaped part 18 Leaf spring 18a, 18b, 18c Leaf spring A School bag

Claims (4)

[Claims] A bottom plate and both side plate portions disposed between the back plate portion and the front plate portion, and an outer peripheral edge of the back plate portion and the front plate portion and a bottom plate portion;
In a school bag in which the front and rear end edges of both side plate portions are integrally sewn together to form a main housing portion having an open upper surface, an outer surface of the front plate portion and both side plate portions is covered near the opening edge. A bag-shaped portion is provided inside the outer skin, and a leaf spring having a circular arc cross section made of a metal strip is provided inside the bag-shaped portion so that its convex surface faces outward, and the opening edge is located near the opening edge except for the back plate portion side. Is enclosed by the leaf spring. 2. The school bag according to claim 1, wherein the leaf springs are separately provided in three pieces so as to correspond to the front plate portion side and the respective side plate portion sides. 3. The school bag according to claim 1, wherein the leaf springs are separated from each other so as to reach from the respective side plate portions to the front plate portion and to overlap the respective tip portions. 4. The plate spring is arranged so as to be continuous with the one plate spring over the front plate portion side and both side plate portion sides.
The described school bag.