JP3218154U - school bag - Google Patents

Abstract

The present invention provides a school bag that reduces a burden on a waist of a schoolchild by eliminating a sewing portion from a lower end portion of a back plate and providing a cushion portion. A main storage chamber having a back plate attached to the front surface, a school bag body having a front pocket portion attached to the rear surface of the main storage chamber, a lid plate covering the entire upper surface of the school bag body so as to be openable and closable, In the school bag with the upper end of the shoulder belt attached to the upper center, the back plate 11 is integrally formed with a bottom plate portion 13 that can be bent below the flat back plate portion 12, and a cushion of an arbitrary shape is formed on the surface of the back plate portion. A portion 15 is provided. [Selection] Figure 3

Description

The present invention relates to an improvement of a back plate constituting a school bag.

2. Description of the Related Art Conventionally, schoolchild school bags are composed of a school bag body formed of natural leather or artificial leather, a cover plate (cover) that covers the entire upper surface of the school bag body, and a shoulder belt that supports the school bag body. The school bag main body is provided with a main storage room for storing textbooks, notebooks, etc., a sub storage room for storing various teaching materials, and a front pocket for storing various accessories.

Therefore, the school bag 1 is formed by sewing many assembly parts through many manufacturing processes. The school bags are designed to be durable and long-lasting so that they will not be deformed or damaged due to secular change or impact, etc., because they will go to school for six years from the first grade to the sixth grade. Furthermore, it is preferable that the body is light and small in order to easily carry a small body of a lower grade without physical strength and to facilitate handling.

On the other hand, the size of textbooks and notebooks accommodated in recent school bags has shifted from the B5 size to the A4 size, and the A4 size is now standard. Therefore, the size of the school bag is inevitably large. Therefore, in order to be able to store A4 size textbooks without changing the width of the school bag, a sewing part (so-called edge part) protruding in the width direction of the school bag for sewing the back plate and the main storage room. There is known a school bag that prevents the enlargement by increasing the internal accommodation width without changing the widthwise spread.

JP 2003-310324 A JP 2003-310326 A

However, the school bag is firmly sewn and fixed so that the connecting portion between the back plate and the school bag body does not peel off. Therefore, the gusset side of the back plate can be sewn and fixed inside the main storage chamber, but the lower side portion of the back plate is exposed to the sewn portion with the school bag body and has a hard structure. For this reason, when the school bag is carried on the back, the lower end of the back plate hits the back and waist of the schoolchild, causing back pain. In addition, if the sewn portion is hard, the clothes and the sewn portion rub against each other, which causes many problems such as easy deterioration of the clothing.

Therefore, the problem to be solved by the present invention is to reduce the burden on schoolchildren's shoulders and waist by connecting the backboard and the backpack body by eliminating the hard sewing part from the lower end of the backboard and making the backpack easier to carry. At the same time, the number of constituent parts of the school bag is reduced to save labor, reduce the weight and reduce the cost of the sewing process.

To achieve the above object, the main storage chamber 10 having the back plate 11 attached to the front surface, the school bag body 2 having the front pocket portion 41 attached to the back surface of the main storage chamber, and the entire upper surface of the school bag body are opened and closed. In the satchel 1 that covers the cover plate 5 that can be covered and the upper end of the shoulder belt 7 at the upper center of the back plate, the back plate 11 has a bottom plate portion 13 that can be bent below a flat back plate portion 12. It is formed integrally, and a cushion part 15 having an arbitrary shape is provided on the surface of the back plate part 12. Further, the back plate 11 is formed with connecting portions 19 attached to the surface substrate 21 at both ends in the width direction of the back plate portion 12 and the bottom plate portion 13 integrally formed of a flexible synthetic resin plate having flexibility. The cushion part 15 which formed the foamed resin material which has elasticity and a softness | flexibility in the arbitrary shape is provided in the surface of the board part 12, and the artificial leather is formed in the surface of this cushion part and the whole surface side of the said back board part 12 and the bottom board part 13 It is characterized by being formed by crimping and fixing an outer skin 20 made of a material. Further, the cushion portion 15 is provided with a waist rest portion 16 provided in the lower side width direction of the back plate portion 12 and a back rest portion 17 located inside the connection portion 19 provided at both left and right ends. It is characterized by. Furthermore, the waist portion 16 is formed such that the lower side width direction of the inner core portion 16a made of a foamed resin material is formed in the horizontal direction at the lower side of the back plate portion 12, and the upper side is gently lowered downward from side to side with the center at the top. And a curved portion 16b formed in a round shape on the inner lower side of the central cross section and a bulging portion 16c bulged on the outer lower side are integrally provided. Further, the backrest portion 17 has an inner core portion 17a made of a foamed resin material provided inside the connecting portions 19 provided on the left and right sides of the back plate portion 12, respectively, with the outside being high and the inside being gently inclined to have a low cross section. It is formed in a mountain shape. Furthermore, the main storage chamber 10 is formed so that the back plate 11, the back surface portion 22, the bottom surface portion 23, and the surface portion 24 formed to have the same width as the width of the back plate can be bent continuously. And a pair of gusset plates 31 attached to both ends in the width direction of the surface substrate bent in a U shape, and a margin part 25 provided at each of the both ends in the width direction of the surface substrate 21; The overlap portions 33 formed by bending the width direction both ends and the bottom end of the gusset plate 31 inwardly are overlapped, and arbitrary portions of the respective overlap portions 25 and 33 are fixed by the connecting rods 48, and the surface substrate 21 is fixed. The back plate portion 12 and the bottom plate portion 13 of the back plate 11 are bonded to the front surface side of the back surface portion 22 and the bottom surface portion 23, and then the overlap portions 25 and 33 of the superposed surface substrate 21 and gusset plate 31 and the back plate 11 are bonded. Sewn through the connecting strip 51 at the corner with the connecting portion 19 And characterized by being a constant. Furthermore, the main storage chamber 10 is provided with a decorative core plate 45 formed in a substantially square shape on the entire inner wall surface, and a bent plate portion 46 provided at each lower end of the decorative core plate is positioned on the inner bottom surface. In addition, the inner bottom substrate 50 is attached to the entire inner bottom surface including the bent plate portion 46.

Accordingly, the school bag 1 can be coupled to the lower side of the back plate 11 by forming the waist contact portion 16 having cushioning properties and without the sewing portion from the lower side of the back plate 11 to the main storage chamber 10. In addition, it is possible to prevent back and waist pains of school children carrying the school bag 1, and the clothes can be prevented from rubbing and deteriorating because the clothes do not hit the hard sewing part. Furthermore, the weight of the school bag can be reduced and the cost can be reduced by reducing the number of components of the main storage chamber 10 constituting the school bag.

FIG. 1 is a front view of a school bag in which a part of the backpack belt is omitted. FIG. 2 is a bottom view of the school bag. FIG. 3 is a front view of the back plate. FIG. 4 is an exploded cross-sectional view showing the waist plate portion of the back plate. FIG. 5 is an exploded cross-sectional view showing a backrest portion of the back plate. FIG. 6 is an enlarged cross-sectional view of a main part of the surface substrate. FIG. 7 is an exploded perspective view of the main storage chamber. FIG. 8 is a central cross-sectional view of a state in which gusset plates are attached to both ends of the surface substrate. FIG. 9 is a central cross-sectional view of the main storage chamber in which a back plate is attached to the back surface portion of the front substrate and a front pocket is attached to the front surface portion. FIG. 10 is a central cross-sectional view of the completed main storage chamber. FIG. 11 is an enlarged vertical cross-sectional view of a main part showing a state in which the waist plate portion of the back plate hits the back of a schoolchild. FIG. 12 is an enlarged cross-sectional view of the main part showing a state in which the back plate portion of the back plate hits the back of the schoolchild.

The embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a school bag in which a part of a backpack belt is omitted, FIG. 2 is a bottom view of the school bag, FIG. 3 is a front view of a back plate, and FIG. FIG. 5 is an exploded cross-sectional view showing the back plate of the back plate, FIG. 6 is an enlarged cross-sectional view of the main part of the surface substrate, and FIG. 7 is an exploded perspective view of the main storage chamber. 8 is a central cross-sectional view of a state where gusset plates are attached to both ends of the front substrate, and FIG. 9 is a central cross-sectional view of a main storage chamber in which a back plate is attached to the back side of the front substrate and a front pocket is attached to the front portion. FIG. 10 is a central cross-sectional view of the completed main storage chamber. A school bag 1 made of natural leather or artificial leather has a main body 2 comprising a main storage room 10 for storing textbooks and notebooks, and a front pocket 41 for storing small items, and an opening of the main storage room 10. A cover plate 5 (cover) that can be opened and closed and a shoulder belt 7 that carries the backpack 1 on its back.

As shown in FIG. 7, the main storage chamber 10 constituting the school bag body 2 is formed in a box shape having an opening on the upper side by a back plate 11, a surface substrate 21, and a pair of gusset plates 31. The decorative core plate 45 is attached to reinforce the strength of the entire inner peripheral wall surface, and the inner bottom substrate 50 is attached to the inner bottom surface.

As shown in FIGS. 3, 4, and 5, the back plate 11 is overlapped with a flexible synthetic resin plate (polypropylene resin plate) on the lower end of the back plate portion 12 on the bottom surface portion 23 of the front substrate 21. The bottom plate portion 13 to be bent is integrally formed so that it can be bent, and connecting portions 19 are formed on both ends of the back plate portion 12 and the bottom plate portion 13 in the width direction. Further, the length in the front-rear direction of the bottom plate portion 13 that is superposed on the bottom surface portion 23 of the front substrate 21 is formed to be about one third of the gusset width of the gusset plate 31.

The back plate 11 is provided with a cushion portion 15 in which a foamed resin material having elasticity and flexibility is formed in an arbitrary shape on the surface of the back plate portion 12, and the surface of the cushion portion, the back plate portion 12, and the bottom plate portion 13 are provided. An outer skin 20 made of an artificial leather material is press-fixed and formed on the entire surface side. The above-described back plate 12, bottom plate 13, cushion 15, and skin material 20 may be fixed by thermocompression using a known hot press machine.

The back plate 11 has a back ring 27 attached to the upper center of the back plate portion 12, and the connection portions 19 provided at both ends in the width direction of the back plate portion 1 and the bottom surface portion 13 are the surface substrate 21 and the gusset plate 31. This is a blank portion that is overlapped with the glue margin portions 25 and 33 and sewn.

The cushion portion 15 bulges into a vertically elongated framer inside a flexible waist portion 16 bulged from the bottom side width direction of the back plate portion 12 toward the bottom plate portion 13 and connection portions 19 provided at both ends in the width direction. A flexible backrest 17 is provided. In addition to the arrangement of the waist support part 16 and the back support part 17 described above, a middle contact part 18 may be provided between the back support part 17 and the back support part 17. The shape of this cushion part 15 shows an example, and is not limited to the above arrangement.

As shown in FIG. 4, the waist portion 16 is made of a well-known synthetic resin foam material, for example, a flexible cushioning material made of urethane foam, polyethylene foam, polystyrene foam or the like, and has a lower side of the inner core portion 16 a. Is formed in a horizontal direction in the lower side width direction of the back plate part 12, and is formed by gently tilting the left and right direction downward with the center on the upper side as a top part, and the inner lower part of the inner core part is formed in a round shape. The part 16b and the bulging part 16c which bulged the outer lower side are each provided.

This waist support portion 16 is formed by bending a part of the front substrate 21 in a rounded shape on the bottom surface portion 23 side, so that there is no hard corner at the lower end, so the back plate 11 of the school bag 1 on the back or waist of the schoolchild It can be easily carried on the back without hitting the lower end, and since it contacts the clothes without rubbing, deterioration of the clothes can be prevented.

As shown in FIG. 5, the backrest portion 17 forms an inner core portion 17 a with a well-known synthetic resin foam material, for example, a flexible cushion material having elasticity made of urethane foam, polyethylene foam, polystyrene foam, etc. On the inner side of the connection part 19 provided on both the left and right sides of the back plate part 12, the outer side of the cross section is made higher and the inner side is made lower to form a symmetrical mountain shape.

The outer skin 20 constituting the back plate 11 is made of a well-known artificial leather (for example, registered trademark Clarino), and is formed by thermocompression bonding on the entire surface of the backrest portion 12 and the bottom plate portion 13 to which the cushion portion 15 is attached. It is.

As shown in FIG. 6, the surface substrate 21 is made of a well-known artificial leather material, and is formed on the back surface of a surface sheet 21a formed by impregnating a synthetic resin material into a base fabric made of nonwoven fabric in order to reduce strength and weight. The elastic sheet material 21b made of a foamable resin material having a cushion function, and the back sheet 21c formed by laminating a stretchable knitted fabric and a synthetic resin sheet are laminated and heat-pressed by a known heat press. However, the present invention is not limited to this.

The surface sheet fabric 21a is a known artificial leather material formed by impregnating a polyurethane resin material on the surface of a lightweight and strong nonwoven fabric, for example, a product name manufactured and sold by Kuraray Co., Ltd. It is desirable to use “Clarino” (registered trademark).

The elastic sheet material 21b is an elastic sheet material in which a foamed resin material having a thin and light elasticity, shock absorbing property and flexibility is made of urethane foam, polyethylene foam, polystyrene foam, etc., preferably polyethylene foam, for example, It is desirable to use the product name “Torepefu” (registered trademark) manufactured and sold by Toray Industries, Inc.

The back sheet 21c is formed by thermocompression bonding with a roller a stretchable knitted fabric (knit fabric), preferably a tricot knitted fabric and a synthetic resin sheet having an arbitrary pattern on the surface.

The surface substrate 21 is integrally formed with a back surface portion 22, a bottom surface portion 23, and a surface portion 24 having the same width as the lateral width of the back plate 11, and is positioned on both sides of the bottom surface portion 23 located in the center in the horizontal direction. The back surface portion 22 and the front surface portion 24 are raised so as to be bent into a substantially U shape. Therefore, since there is no connection part of the back surface part 22, the bottom face part 23, and the surface part 24 of the surface substrate 21 described above, the sewing process can be omitted.

As shown in FIG. 7, the gusset plate 31 has three sides on both sides in the width direction and the lower end of the gusset surface portion 32 made of a hard synthetic resin plate formed in the front-rear width (about 14 to 16 cm) of the main storage chamber 10, respectively. The paste margin portion 33 is integrally formed by bending, and a notch 35 is provided at the lower end intersection of the paste margin portion 33 on the three sides to facilitate the folding of the paste margin portion 33.

Further, the gusset plate 31 is provided with a concavo-convex reinforcing portion (not shown) on the surface of the gusset surface portion 32 to enhance the strength of the main storage chamber 10. A hanging tool 49 such as a ring or a hanging ring is attached to the upper center of the gusset surface portion 32, and a locking ring 28 for pivotally locking one end of the shoulder belt 7 is attached to the lower side. . By attaching the lower end of the shoulder belt 7 to the gusset surface portion 32 of the gusset plate 31 so as to be pivotable, the lower portion of the shoulder belt 7 is widened, so that it is possible to easily carry the school bag even if the schoolchild is in an upper grade.

The front pocket 41 is formed of the same material as the surface substrate 21, and integrally has a lower surface portion 42 that overlaps the bottom surface portion 23 of the surface substrate 21, and ends of small gusset portions 43 provided on both sides. Are bonded to the glue margin 25 of the surface portion 21 and the glue margin 33 of the gusset plate 31, and a slide fastener (not shown) is attached to the upper surface opening so as to be openable and closable.

As shown in FIG. 7, the decorative core plate 45 is formed in a rectangular shape in which a hard resin plate material is superimposed on the inner wall surface of the main storage chamber 10, and the lower portions of the wall surfaces are bent inward to form the inner bottom surface of the main storage chamber 10. The bent plate portion 46 is provided integrally. By superposing the decorative core plate 45 on the inner wall of the main storage chamber 10, the strength of the main storage chamber 10 is reinforced, and the inner wall surface of the decorative core plate 45 is printed in an arbitrary pattern. It can be used as a decorative wall.

In the sewing process of the school bag 1, the bottom surface portion 23 of the surface substrate 21 is positioned in the horizontal direction, both the back surface portions 22 and the surface portions 24 of the bottom surface portion are raised in parallel and bent into a substantially U-shape. The overlap margin portion 33 of the gusset plate 31 is superposed on the paste margin portion 25 provided at both ends, and the connecting rods 48 are respectively attached to the holes 26 and 34 provided in the mutual margin portions 25 and 33 and fixed. Thus, the main storage chamber 10 having a size that can accommodate an A4 size textbook is formed (FIG. 8).

Next, one side 51a in the width direction from the center line of the connecting band 51 is sewn and fixed to the connection portions 19 provided at both ends of the back plate 11, and the back plate portion 12 and the bottom plate portion 13 of the back plate 11 are connected to the surface substrate 21. The bottom plate portion 13 is superposed on the bottom surface portion 23 of the surface substrate 21 and sewn, and the opposite side 51b of the connecting band 51 is the gusset surface portion of the gusset plate 31. 32 are sewn and fixed to both sides 32a and bottom 32b. Therefore, since there is no sewn portion with the surface board 21 on the lower side of the back plate 11, the back plate can be fitted comfortably from the back of the schoolchild to the waist (FIG. 9).

The front pocket 41 is located on the surface portion 24 side of the surface substrate 21, and a lower surface portion 42 provided at the lower end is overlapped and sewn to the bottom surface portion 23 of the surface substrate 21, and the small gusset portions 43 provided on both sides are sewn. The end portion is overlapped and bonded to the paste margin portion 25 of the surface portion 21 and the glue margin portion 33 of the gusset plate 31, and the overlap portion is sewn and fixed on the opposite side 51b of the connection band 51, and the opening provided on the upper surface A slide fastener (not shown) is attached to the door so as to be openable and closable. Therefore, the lower end of the front pocket 41 cannot be sewn.

Further, the bent plate portions 46 provided at the lower end of the decorative core plate 45 are respectively bent inside and attached to the inner side of the main storage chamber 10, and from the upper surface to the inner bottom surface of the bent plate portion 46 located on the inner bottom surface. The inner bottom substrate 50 is entirely covered and fixed to the bottom surface portion 23 with a fixing tool 56 (FIG. 10).

Further, when the back plate 11 is bonded to the surface substrate 21, the opposite sides 51 b of the connection band 51 sewn and fixed to the connection portions 19 provided at both ends of the back plate 11 are connected to both sides of the gusset surface portion 32 of the gusset plate 31. It is sewn and fixed to 32a and the base 32b. When the connection band 51 is sewn to the bottom surface of the school bag body 2, the reinforcing pieces 53 are positioned at the four corners of the bottom surface, and the reinforcing piece, the connection band 51, and the gusset plate 31 are sewn and fixed simultaneously with the sewing thread 54. The bottom surface of the school bag 1 can be protected to prevent damage and damage due to impact (FIG. 10).

Hereinafter, the operation of the embodiment of the present invention will be described. The school bag 1 includes a school bag body 2 including a main storage chamber 10 and a front pocket 41, and a lid that covers the opening of the main storage chamber 10 of the school bag body so as to be opened and closed. The backpack 7 that carries the back plate 5 and the backpack 1 is configured to reduce the number of backpack components, reduce the weight of the backpack 1 and omit the sewing process, improve work efficiency, and reduce costs. It is very economical.

The main storage chamber 10 includes a back plate 11, a front substrate 21, a pair of gusset plates 31, a decorative core plate 45 attached to the inner peripheral wall surface of the main storage chamber 10, and a minor part including an inner bottom plate 50 laid on the inner bottom surface. Therefore, the sewing process can be omitted, work efficiency can be improved, and cost can be reduced.

The back plate 11 of the main storage chamber 10 constituting the school bag body 2 is integrally formed with a bottom plate portion 13 in which the lower end side of the back plate portion 12 is bent toward the bottom surface of the main storage chamber 10. By forming a part of the inner core portion 16a made of a foamed resin material, which is a core material of the provided waist portion 16, from the width direction and bulging in a rounded shape to the bottom plate portion side, The lower back of the back plate 11 of the school bag 1 does not hit the waist, so that it can be easily carried on the back.

Furthermore, when the back plate 11 and the main storage chamber 10 are coupled, the bottom portion of the back plate 12 is removed from the lower end of the back plate portion 12 and swelled downward, so that the bottom portion of the back plate portion 12 is hardened by sewing. I can't. Therefore, as shown in FIG. 11, since the hard part does not hit the back X or the waist of the school children, the back pain of the school children can be prevented, and the clothes can be prevented from deteriorating because they are in contact with the clothes without rubbing.

In addition, as shown in FIG. 12, the back plate 11 is provided with the outer side of the inner core portion 17a made of a foamed resin material inside the connecting portions 19 provided on the left and right sides of the back plate portion 12, and the inner side is gently inclined. By forming it with a low cross-sectional mountain shape and making the entire surface recessed, it is possible to fit the back X of the schoolchild's protruding shape, so that the school bag 1 shakes left and right when walking You can carry it back.

In the sewing process of the main storage chamber 10, the back surface portion 22 and the surface portion 24 located on both sides of the bottom surface portion 23 of the front substrate 21 are raised in parallel and bent into a substantially U shape, and are provided at both ends of the front substrate. The glue part 33 of the gusset plate 31 is superposed on the glue part 25 from the outside, and is fixed to the holes 26 and 34 provided in the glue parts 25 and 33 by the connecting rods 48 (FIG. 8).

Next, one side of the connecting band 51 is sewn to the both end connecting portions 19 of the back plate 11, and then the back plate portion 12 and the bottom plate portion 13 of the back plate 11 are connected to the back surface portion 22 and the bottom surface portion 23 of the surface substrate 21. Glue to the outside. On the other hand, the front pocket 41 and the lower surface portion 42 are bonded to the front surface portion 24 and the bottom surface portion 23 of the front substrate 21, and the opposite side of the connection band 51 sewn to the connection portion 19 of the back plate 11 is connected to the gusset plate 31. The gusseted surface portion 32 is sewn and fixed to both sides 32a and the bottom side 32b (FIG. 9).

Therefore, since a sewn part with the surface board 21 cannot be formed on the lower side of the back plate 11, the back plate can be fitted comfortably from the back of the schoolchild to the waist. Further, the lower surface portion 42 of the front pocket 41 is bonded to the bottom surface portion 23 of the surface substrate 21 and is sewn, so that the bottom portion of the front pocket 41 cannot be sewn with the surface substrate 21, so that the appearance of the school bag is refreshed. Can be made.

Further, the decorative core plate 45 is attached in close contact with the inner wall surface of the main storage chamber 10, and the bent plate portion 46 provided at the lower end is located on the inner bottom surface, and the entire inner bottom surface is formed from the upper surface of the bent plate portion. The inner bottom substrate 50 is fixed by a fixing tool 56 (FIG. 10).

The inner peripheral wall surface of the main storage chamber 10 is doubled by bringing the surface substrate 21, the gusset plate 31 and the decorative core plate 45 into close contact with each other, thereby maintaining the strength of the peripheral wall surface and folding the decorative core plate 45 on the inner bottom surface. By positioning the plate portion 46, the main storage chamber 10 can be firmly fixed to the stored item so as not to be deformed or damaged by weight or external impact.

As described above, the school bag 1 has one end of the shoulder belt 7 attached to the back ring 27 attached to the center of the upper end of the back plate 11, and the other end connected to the Dharma ring 58 provided on the support fitting 55 attached to the bottom surface of the school bag. In addition, one end of the cover plate 5 that covers the opening of the main storage chamber 10 so as to be openable and closable is sewn and fixed to the upper end of the back plate 11, and the cover plate 5 is fastened and locked to the support fitting 55. It can be opened and closed.

When the back plate 11 is bonded to the front substrate 21, the opposite side 51b of the connecting band 51 sewn and fixed to the connection portions 19 provided at both ends of the back plate 11 is connected to both sides 32a and bottom sides 32b of the gusset surface portion 32 of the gusset plate 31. When the sewing pieces are fixed by sewing, the reinforcing pieces 53 located at the four corners of the lower surface of the school bag 1 are fixed by sewing together with the gusset plate 31 so that the school bag 1 can be prevented from being damaged or damaged by the impact.

DESCRIPTION OF SYMBOLS 1 School bag 2 School bag main body 5 Cover plate 7 Backpack belt 10 Main storage chamber 11 Back plate 12 Back plate part 13 Bottom plate part 15 Cushion part 16 Lumbar part 17 Back part 19 Connection part 20 Skin surface 21 Surface substrate 22 Back surface part 23 Bottom face Portion 24 surface portion 25 margin portion 26 hole 27 back ring 31 gusset plate 32 gusset surface portion 33 margin portion 34 hole 35 notch portion 41 front pocket 42 lower surface portion 43 small gusset portion 44 opening portion 45 decorative core plate 46 bent plate portion 48 Connecting rod 50 Inner bottom substrate 51 Connecting belt 51a One side 51b The other side 53 Reinforcing piece 54 Sewing thread 55 Support metal fitting 56 Fixing rod X Back

Claims (7)

A main storage chamber (10) having a back plate (11) attached to the front surface;
A school bag body (2) with a front pocket (41) attached to the back of the main storage room;
A lid plate (5) covering the entire top surface of the school bag body so as to be openable and closable;
In the school bag (1) in which the upper end of the shoulder belt (7) is attached to the upper center of the back plate,
The back plate (11) is integrally formed with a bottom plate portion (13) that can be bent below a flat back plate portion (12), and a cushion portion (arbitrary shape) on the surface of the back plate portion (12). A school bag characterized by comprising 15). The back plate (11) is a connecting portion (12) attached to the surface substrate (21) at both ends in the width direction of a back plate portion (12) and a bottom plate portion (13) integrally formed of a rigid synthetic resin plate having flexibility. 19), and a cushion part (15) in which a foamed resin material having elasticity and flexibility is formed in an arbitrary shape is provided on the surface of the back plate part (12), and the surface of the cushion part and the back plate part The school bag according to claim 1, wherein a skin (20) made of an artificial leather material is pressure-bonded and fixed to the entire surface side of (12) and the bottom plate (13). The cushion portion (15) includes a waist portion (16) provided in the lower side width direction of the back plate portion (12) and a back portion (17) positioned inside the connecting portions (19) provided at both left and right ends. The back plate for a school bag according to claim 1 or 2, wherein each of the back plates is provided. The lower back portion (16) is formed such that the lower side width direction of the inner core portion (16a) made of a foamed resin material is formed in the horizontal direction at the lower side of the back plate portion (12), and the upper side is the lower side with the center at the top. And a curved portion (16b) formed in a round shape on the inner lower side of the central cross section and a bulging portion (16c) bulged on the outer lower side are integrally provided, respectively. The back plate for a school bag according to claim 3. The backrest portion (17) has an inner core portion (17a) made of a foamed resin material inside the connecting portions (19) provided on the left and right sides of the backplate portion (12). 4. The back plate for a satchel according to claim 3, wherein the back plate is formed in a mountain shape having a low cross-section by inclining. In the main storage chamber (10), the back plate (11), a back surface portion (22), a bottom surface portion (23), and a front surface portion (24), which are formed to have the same width as the back plate, are integrated continuously. And a pair of gusset plates (31) attached to both ends in the width direction of the surface substrate bent in a U-shape. The margin part (25) provided at both ends in the width direction and the margin part (33) formed by bending the both ends in the width direction and the bottom end of the gusset plate (31) inward are superposed to each other. Arbitrary portions of (25, 33) are fixed by a connecting rod (48), and the front substrate (21) is connected to the back plate portion of the back plate (11) on the surface side of the back surface portion (22) and the bottom surface portion (23). (12) and the bottom plate (13) are bonded, and then the superposed surface substrate (21) and gusset plate (31) The school bag according to claim 1, characterized in that it is fixed by sewing through a connecting strip (51) at the corner of the margin (25, 33) and the connecting part (19) of the back plate (11). . The main storage chamber (10) is provided with a decorative core plate (45) formed in a substantially square shape on the entire inner wall surface, and a bent plate portion (46) provided at each lower end of the decorative core plate is positioned on the inner bottom surface. The back plate for a satchel according to claim 1 or 6, wherein the inner bottom substrate (50) is attached to the entire inner bottom surface including the bent plate portion (46).

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