JP2006034953A - Satchel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a satchel eliminating an edge part projecting outward from the end of a back contact plate to form a side face part flat. <P>SOLUTION: The satchel comprises the back contact plate 21 having a back plate bottom piece 21a at the lower part; and a storage member 26 provided with side plate bottom pieces 29a, 29a at the lower parts of side face plates 29, 29 provided on both sides of a front face plate 27 formed to be equal in breadth to the back contact plate 21 and having a front plate bottom piece 27a at the lower part, and inward folded connecting pieces 30, 30 of thin width provided at the ends of both side face plates. An upper opening 37 is formed at the upper part of a main storage part 36 provided by fastening both side edges 21b, 21b of the back contact plate to the inside of the inward folded connecting pieces 30, 30 and sewing to fix both side parts of the back contact plate. The back plate bottom piece 21a, the front plate bottom piece 27a and the side plate bottom pieces 29a, 29a are folded inward in order, and a reinforcing bottom plate 39 is fitted and integrally fixed to provide a bottom face part 38. Reinforcing part pieces 40, 40a can be mounted to the inside of the upper opening 37 for reinforcement. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a school bag having a side surface formed flat by eliminating an edge portion forming a sewing portion that protrudes outward from an end portion of the back plate of the school bag.

  As shown in FIG. 13, the conventional school bag 1 includes both side ends of a back plate 2 in contact with the back of a schoolchild, and both side ends of a storage member 4 bent in a substantially U shape on the front side of the back plate. Are fitted and sewn and fixed, and a wall 10 is formed around the back plate 2 and the storage member 4 to accommodate a textbook and the like. A pair is formed by bending both side portions in the direction of the back plate from bent portions 6 and 6 provided at both sides of the front surface portion 5 which is an intermediate portion of the storage member 4 and located in front of the back plate 2. Side surface portions 7 and 7 are formed, respectively, and end portions 8 and 8 are formed by bending the end portions of both side surface portions 7 and 7 so as to protrude outward.

  The outer folding end portions 8 and 8 and the both side end portions 2a and 2a of the back plate 2 are sewed together to form the sewn portions 9 and 9, which are bent into a substantially U shape with the back plate 2. A storage portion 10 for storing a textbook and the like is formed inside the storage member 4 (a small storage portion, a back belt, a lid piece, etc. provided on the front side of the storage portion are omitted in the drawing).

  The accommodating part 10 has an opening 11 that is horizontally long when viewed from above, and is formed in a size that can accommodate, for example, an A4 size textbook. Generally, schoolbags that have just entered elementary school and have no physical strength carry on to school for six years, so it is necessary to make sure that the school bag does not deform due to changes over time. In addition, it is preferable that the small body is light and small so that it can be easily carried on the back and easy to handle. Therefore, the size of the backpack 2 of a normal school bag is made as small as possible by making it about one size larger than the A4 size of the textbook accommodated in the accommodating portion 10.

  The conventional school bag storage portion 10 sews both side end portions 2a and 2a of the back plate 2 and outer folding end portions 8 and 8 provided to protrude from the end portions of the side surface portions 7 and 7 of the storage member 4. Providing a fixed sewing portion 9, 9 provides a protruding portion (edge portion) 13 that protrudes outwardly the fixing portion between both side ends of the back plate and the end portion of the side surface. The outer side of the part is wrapped with a jacket material (not shown) and further reinforced so that the fixed part between the back plate and the side part is not deformed. For this reason, there is a disadvantage that the weight increases.

  When both side ends of the back plate 2 constituting the storage portion 10 of the school bag are sewn and fixed to outer folding end portions 8 and 8 provided on both side ends of the storage member 4, generally, the “edge portion” ”And 13 are formed. Then, as shown in FIG. 13, the rectangular spaces X, X having the length of the outer folding end portions 8, 8 as one side and the length of the accommodating portion 10 as the other side are located on both sides of the school bag. The side portions 7 are provided outside the side portions 7. However, the rectangular spaces X and X are not useful for enlarging the volume of the accommodating portion 10 that accommodates textbooks and the like, and the maximum outer shape of the school bag is the size of the back plate, and the rectangular space X , X was not used effectively and was a useless space.

JP 2000-23732 A JP 2001-161422 A Registered Utility Model No. 3078744

  The problem to be solved by the present invention is not to provide a protruding portion that is a sewing portion that protrudes outward from the end portion of the back plate of the school bag, and to flatten the connecting portion between the back plate and the side plate. The present invention provides a school bag that is easy to carry by eliminating the protruding portions that are formed and project from both side portions of the conventional school bag.

  In order to achieve the above object, the present invention provides a back plate 21 having a back plate bottom piece 21a on the lower side, and a front plate having a front plate bottom piece 27a on the lower side formed to be equal to the lateral width of the back plate 21. Side plate bottom pieces 29a, 29a are respectively provided below the side plates 29, 29 provided with bent portions 28, 28 on both sides of the face plate 27, and narrow inner folding connecting pieces 30, 30 are provided at the ends of the side plate. The storage plate 26 is provided, and both side ends 21a, 21a of the back plate are hooked on the inside of the inner folding connecting pieces 30, 30, and both side portions of the back plate are sewn and fixed. An upper opening 37 is formed in the upper part of the main housing portion 36 provided in the front plate 36, the back plate bottom piece 21a, the front plate bottom piece 27a and the side plate bottom pieces 29a, 29a are folded inward in order, and a reinforcing bottom plate 39 is attached and integrated. It is characterized by being provided with a bottom surface portion 38.

  In addition, the back plate 21 is provided on both side ends of a back plate bottom piece 21a formed below the first horizontal folding line 22 provided in the lower portion, from the end of the folding line toward the inside. Notch portions 23 a and 23 a are provided continuously to one arcuate portion 23. The storage member 26 has a second folding line 31 and a third folding line 32 in the horizontal direction provided on the same line below the front plate 27 and the side plates 29 provided in the same width as the back plate. A lower end portion 30a is formed at a position that coincides with the folding line at a lower portion of the narrow inner folding connecting pieces 30, 30 provided on both side ends of the side plate, and a second portion provided continuously to the lower end portion. Cut-out portions 33a, 33a are formed on both side ends of the side plate bottom pieces 29a, 29a in succession to the arc-shaped portions 33, 33, and a side end of the front plate bottom piece 27a and a side end of the side plate bottom pieces 29a, 29a are formed. A notch recess 34, 34 having an arcuate upper portion is provided therebetween. The notches 23a and 33a and the notch recess 34 may be formed perpendicular to the bottom surface with a space therebetween, but are slightly inclined inward so that the lower width is made smaller than the upper width. A slightly shorter shape is preferable because it is easy to fold and improves workability.

  As described above, the side plates 29 and 29 provided continuously on both sides of the front plate 27 provided on both sides of the storage member are bent, and the narrow inner folding connection pieces 30 and 30 provided on the front ends of the side plates are formed. Since the main accommodating part 36 is provided in the inner side, the both side ends 21b and 21b of the back plate 21 are fixed by sewing, and the main fixing part 36 is provided inside. Located on the surface side). Therefore, the surface of the side part of the school bag can be formed flat. The width of the school bag is large enough to accommodate a textbook that is the size of the A4 size. As in the past, the both sides of the back plate 21 and the ends of the side plates are sewn together. Since the provided protruding portion does not protrude outward, the lateral width of the school bag can be reduced and the weight can be reduced.

  Furthermore, the present invention folds on both sides of a back plate 21 having a back plate bottom piece 21a on the lower side and a front plate 27 having a front plate bottom piece 27a formed on the lower side and having a width equal to the width of the back plate 21. The side plate 29, 29 provided with the curved portions 28, 28 is provided with side plate bottom pieces 29a, 29a below the side plates 29, 29, respectively, and the storage member 26 provided with narrow inner connecting pieces 30, 30 at the end portions of both side plates. And a main housing portion provided inside by fastening both side portions 21a, 21a of the back plate to the inside of the inner folding connecting pieces 30, 30 and sewing and fixing both side portions of the back plate. An upper opening 37 is formed in the upper part of 36, a reinforcing piece is mounted inside the bent portion of the upper opening 37, and the back plate bottom piece 21a, the front plate bottom piece 27a, and the side plate bottom pieces 29a, 29a are sequentially arranged. Folded inward, attached with a reinforcing bottom plate 39 and secured together to the bottom surface 38 Characterized by comprising providing.

  A back plate bottom piece 21a, a front plate bottom piece 27a, and both side plate bottom pieces 29a provided in the lower portions of the back plate 21, front plate 27, and both side plates 29, 29 via folding curves 22, 31, 32, respectively, are inward. The main housing portion of the school bag is formed by sequentially folding and fixing together so as to provide a bottom surface portion 38, and reinforcing portions 40 or 40 a attached to both side portions inside the upper opening 37 of the main housing portion for reinforcement. In particular, the upper opening 37 provided in the upper part of the main housing portion is reinforced and is not easily deformed, so that a strong school bag can be provided.

  In other words, the inner folding connecting pieces 30 and 30 provided at the ends of the side plates 29 and 29 forming the storage member 26 and the side ends 21b and 21b of the back plate 21 are referred to as “edge portions” provided in the conventional school bag. The protruding portions 13 and 13 are formed flat without protruding outward, and in particular, since the sewing portions are provided on both side portions on the back plate side, the sewing portions are not located on the surface of the side plate. And it can utilize effectively to the outer side end of this back plate, without providing a useless space in the outer side of this side plate 29,29.

  Further, in addition to the above-described operation, adjacent portions of each bottom piece are provided with a notch portion and a notch recess portion continuous with the arc-shaped portion, and a space portion is provided between them, so that the adjacent back plate bottom piece 21a and side plate bottom piece When 29a, the side plate bottom piece 29a, and the front bottom piece 27a are folded inward, other adjacent bottom pieces can be easily folded without being obstructed. In particular, if the side plate bottom piece and the back plate bottom piece of the storage member are formed separately, and the side end portions are formed obliquely inwardly, the back plate bottom piece is a double-sided plate bottom piece. It can be easily folded between the two, and the folding work can be easily performed. The side edges of the side plate bottom piece and the back plate bottom piece are not necessarily formed obliquely, and it is sufficient that there is a slight gap between them.

  In the present invention, the surface of both side plates is formed flat so as not to provide the protruding portions 13 and 13 called “edge portions” around the periphery of the back plate, and the presence of the protruding portions is effective. The outer space of the side plate that could not be used can be used effectively. That is, it is possible to reduce the size and weight by eliminating the protruding portion called the “edge portion”. In addition, the main accommodating portion can be widened to the extent of the protruding portion, thereby making it easy to put in and out of the textbook.

  In addition, by attaching reinforcing pieces to the inside of the bent portions located on both sides of the upper opening 37 existing in the upper portion of the main housing portion and reinforcing the upper opening, conventionally, the end portion of the housing member is fixed by sewing. Even if the projecting portion generated by the removal is eliminated, the strength of the school bag can be increased and the deformation can be prevented together with the firmly formed bottom surface portion.

  FIG. 1 is a perspective view showing a main part of a school bag in which a backpack belt is omitted, and FIG. 2 is a separated view before combining a back plate and a storage member constituting the school bag. FIG. 3 is a plan view of the back plate, FIG. 4 is a plan view of the storage member deployed, and FIG. 5 is a view of the inner folding connection piece and the back plate provided at the ends of both side plates of the storage member. FIG. 6 is a cross-sectional view in the direction of line AA in FIG. 5. FIG.

  2 and 3, reference numeral 21 denotes a back plate that directly or indirectly matches the back of a schoolchild, and is made of a member having a certain degree of strength, such as leather or synthetic leather. The conventional back plate shown in FIG. It is formed to have the same width as 2 and the vertical direction is longer than the conventional back plate. That is, the lower part of the back plate 21 is shorter than the lateral width of the side plate 29 to be described later via a first folding line 22 provided in the horizontal direction at the lower end position of the conventional back plate 2 and The back plate bottom piece 21a having a length of more than half of the horizontal width is provided in series. Therefore, even if the back plate bottom piece 21a is folded inward, it does not protrude forward from the front plate 27 but overlaps the front plate bottom piece 27a that is also folded inward.

  The lateral width of the lower end portion of the back plate bottom piece 21a is formed slightly shorter than the lateral width of the back plate 21, and the back plate bottom piece 21a is provided from the both end portions of the folding line 22 toward the lower inner side. In addition, notches 23a and 23a are formed in an oblique manner in succession to the first arc-shaped portions 23 and 23. Therefore, when the back plate bottom piece 21a is folded rearward (front plate side), the side plate bottom pieces 29a and 29a located below the side plate 29 forming the flange portion can be smoothly folded without hindrance. In this case, since the upper horizontal width of the back plate bottom piece 21a is also shortened, when the back plate bottom piece 21a is folded inward, it can be folded smoothly.

  Reference numeral 26 denotes a storage member made of a member such as leather, synthetic leather, or cloth member. The storage member is folded in a substantially U-shape and fixed to both side ends of the back plate to surround and surround the main housing. The length of the part 36 in the left-right direction is formed to be a length that can accommodate an A4 size textbook. That is, a “edge portion” having the same length as the width of the backpack 2 of the conventional school bag, that is, an inner length of about 22 cm, and provided outside the backpack 2 of the conventional school bag. The front plate 27 formed in a length excluding the protruding portion 13 is formed so as to be positioned at an intermediate portion so that a textbook can be taken in and out. Further, side plates 29 and 29 forming ridges are formed on both side portions of the front plate 27 via vertical folding lines 28 and 28, and the front end of the side plate is perpendicular to the inside. Narrow inner fold connecting pieces 30 and 30 to be bent are formed.

  The folding members 28, 28 provided on both sides of the front plate 27 of the storage member 26 are bent at right angles so that the side plates 29, 29 face each other, and formed into a U-shape. The inner folding connection pieces 30 and 30 of the width are bent inward. Next, the back plate 21 is hooked on the inner side of the inner folding connecting piece, and is fixed by sewing portions 24, 24 which are sewn with a thread. In this case, since both side ends 21b and 21b of the back plate are sewn with an industrial sewing machine and manual work by a craftsman can be omitted, workability can be improved. Of course, hand sewing is also possible. In the case of forming a conventional projecting portion called “edge portion” by sewing, the side plate forming the collar portion is located close to it, so that it is difficult to sew with an industrial sewing machine, and often has to be hand-sewn. . However, in the present invention, since there is no wall surface portion that rises like the protruding portion 13 near the sewing portion, the sewing work can be easily performed, and the hand-sewing operation can be reduced.

  The sewn portions 24, 24 are provided on the front side of the back plate 21 (the back side of the schoolchild), and the sewn portion 24 does not appear on the surface of the side plate 29 which is the side portion of the school bag. Because it is flat, it can be finished smartly. Further, the sewing portions may be formed in a single row, or may be formed in a plurality of rows such as two rows to further reinforce the sewing portion 24. If necessary, the upper and lower ends or other parts may be fastened with a scissors. Thus, since the sewing portion is located on the surface of the back plate (the back side of the schoolchild), the sewing portion and the heel do not appear on the surface of the side plate 29, so that a sense of incongruity does not occur. Since the projecting portion 13 referred to as “edge portion” is not provided on the back plate side portion of the side plate, the overall shape of the school bag can be reduced without reducing the volume of the main housing portion 36, and the side surface that is a collar portion The surface of the portion 29 can be flattened to form a smart appearance.

  Further, the back plate bottom piece 21a, the front plate bottom piece 27a and the both side plate bottom pieces 29a, 29a are folded in order, and a substantially rectangular reinforcing bottom plate 39 is sewn to match the inner bottom portion of the main housing portion, or with an adhesive. The bottom surface portion 38 is formed by bonding or using the flanges 42 and 42 and a set screw. The formation of such a strong bottom 38 has the effect of increasing the strength of the lower portion of the school bag and preventing deformation. That is, as shown in FIG. 6, the main accommodating portion 36 has the back plate 21 and the front plate 27 that have the same lateral width and eliminates the conventional protruding portion 13 called the “edge portion”. The width can be shortened to reduce the size. And it is preferable to reinforce by attaching reinforcing part pieces 40, 40 having, for example, a U shape on both sides of the upper openings 37, 37.

  As shown in FIG. 4, at the lower ends of the narrow inner folding connection pieces 30, 30 provided at both side end portions of the storage member 26, a first folding curve provided in the horizontal direction below the back plate 21. A lower end portion 30a is formed by cutting a portion located below the position 22. Then, on the straight line connecting the lower end portions 30a, 30a of the inner folding connecting pieces located at both ends of the storage member 26, the second folding line 31 is located at the lower portion of the front plate 27, and both side plates 29, 29 are located. The third folding lines 32, 32 located at the lower part of the first folding line 32 are provided on the same line, and the first folding line 22, the second folding line 31 and the third folding line provided on the back plate are further provided. 32, 32, the back plate bottom piece 21a, the front plate bottom piece 27a, and both side plate bottom pieces 29a, 29a are folded inward, and a bottom plate 38 is firmly formed by attaching a reinforcing bottom plate 39 as required. is there.

  Further, below the second folding line 31 provided at the lower part of the front plate 27, in order to form the bottom surface portion 38, it is shorter than the lateral width of the side plate 29, but more than half of the lateral width. A front plate bottom piece 27a having a length is provided. Side plate bottom pieces 29a and 29a are formed below the third folding lines 32 and 32 provided below the side plates 29 and 29, respectively. Further, the second and third folding lines 31 and 32 are provided on the extension of the first bent portion 22, and further between the both ends of the front plate bottom piece 27a and the inner ends of the side plate bottom pieces 29a. Is formed with a semicircular shape facing each other.

  A second arcuate portion is provided by biting inwardly from the lower end portions 30a, 30a of the inner folding connecting pieces 30, 30 located on the second and third folding curves 31, 32, that is, on the side plate bottom pieces 29a, 29a side. The notches 33a and 33a are provided continuously to the arcuate portion. In this case, the notches 33a and 33a and the notches 23a and 23a of the adjacent back plate bottom piece 21a have the same action as the notch recess 34.

  Arc-shaped notch recesses 34, 34 are provided between a front plate bottom piece 27a and both side plate pieces 29a, 29a provided at the lower part of the storage member 26, and both ends of the back plate bottom piece 21a and both side plate pieces 29a, 29a are provided. Since the diagonal cutouts 23a and 33a are provided continuously with the arcuate portions between them, the front plate bottom piece 27a, the side plate bottom pieces 29a and 29a, and the back plate bottom piece 21a are easily folded. . A reinforcing bottom plate 37 formed substantially the same size or slightly smaller than the main accommodating portion is accommodated in a bottom surface provided at the lower portion of the main accommodating portion, and further, a mounting bracket (Fig. (Not shown) is fixed to the reinforcing bottom plate 39 and the bottom surface portion 38 with ridges 42, 42, etc., so that the bottom surface portion is firmly formed. The reinforcing bottom plate 39 is formed of a member having strength, for example, leather, synthetic leather, synthetic resin material, metal plate or the like.

  The upper portion of the side plate 29 that forms the collar portion is formed into gentle arc portions 29b and 29b, the upper portions of the side surface plates 29 and 29 are formed in a clean curve, and the upper portion of the upper opening 37 is covered in an arc shape. The arcuate curved surface portion is substantially matched so that there is no gap between them. Further, a front plate bottom piece 27a and a side plate bottom piece 29a provided continuously below the storage member 26 and a back plate bottom piece 21a provided below the back plate are provided. Then, the reinforcing bottom plate 39 is matched and fixed by sewing, gluing, bonding or the like to form a bottom portion 38 having strength. Therefore, as shown in FIG. 9, it is possible to provide a taland cell by clearly forming the outer surface without the upper opening.

  Further, as shown in FIG. 7, the angle formed between the side plates 29, 29 and the front plate 27 by pushing the bent portions 28, 28 provided on both sides of the full plate 27 of the storage member 26 to an angle larger than 90 degrees. Is formed at an obtuse angle of 90 degrees or more. That is, the side plate bottom pieces 29a and 29a provided in the lower part of the both side plates in which the bent portions 28 and 28 have an obtuse angle are formed in an oblique shape. Thus, if the main accommodating part 36 is formed in a trapezoidal shape instead of a rectangle, it has an effect that it is difficult to be deformed even if an external force is applied. In this case, the inner length of both side plates on the back plate side is formed longer than the inner length on the front plate side, and the front portion of the main housing portion 36 is widened in the left-right direction. It has the effect of increasing the strength of the upper part, that is, making it difficult to deform the upper opening.

  A wall surface formed by connecting the both side plates 29, the back plate 21 and the front plate 27 is formed in a square shape, and a main housing portion 36 is provided inside the school bag, and the front plate 27 and the side plates 29, 29 By attaching reinforcement pieces 40 and 40 (FIG. 10) and reinforcement pieces 40a and 40a (FIG. 11) to the upper openings of the bent portions 28 and 28 provided between them, the main housing portion 36, in particular, the main housing portion 36 is provided. The upper opening 37 provided in the upper part of the accommodating part can be formed firmly so as not to be deformed (FIG. 6).

  In this case, using the back plate having the same length as the width of the back plate of the conventional school bag, the triangular space S inside the side plates 29, 29 positioned obliquely as shown in FIG. S can be incorporated into the main housing part 36 and used effectively, and the main housing part 36 can be used with the largest size.

  The bottom surface portion 38 is formed by sequentially folding and fixing each bottom piece in one piece. In that case, it is preferable to sew, bond with an adhesive, and further fix the reinforcing piece in combination with the bent portion. . As shown in FIG. 10, U-shaped reinforcing portion pieces 40 may be attached to the bent portions located on both sides of the upper opening for reinforcement. In addition, as shown in FIG. 11, an L-shaped reinforcing portion piece 40 a may be attached and reinforced inside the bent portion of the upper opening 37. The material of the reinforcing part piece is not limited to a metal material, and an increase in weight can be prevented by using a synthetic resin material. In this way, the reinforcing bottom plate 39 is attached and the bottom surface portion 38 is firmly formed to reinforce the lower portion of the school bag, so that the main housing is combined with the reinforcing portion pieces 40 and 40a attached to both sides of the upper opening. The deformation of the portion 36 can be prevented.

  The lower part of the back plate 21 may be in a compressed state by hitting the waist of the schoolchild when the schoolchild carries the school bag. That is, in the conventional school bag, there are provided protrusions 13 called “koba” on the lower side and both sides of the back plate 21, and this protrusion 13 is sewn and has a hard structure. There was a complaint that it hurts when hitting the waist of a schoolchild. However, since the lower part of the back plate 21 is not provided with a projecting portion and is bent from the first fold line 22 to the bottom surface side, the fold made of the first fold line 22 located at the lower part of the back plate 21 Since the tune part hits the waist of a schoolchild, it does not give a feeling of pressure to the waist and can prevent pain in the waist. In this case, pad portions 45, 45 having an arbitrary shape are provided on the surface of the back plate 21, and the flat (surface) portions of the pad portion 45 are inwardly connected connecting pieces located at both side ends of the back plate. The pad portions 45 and 45 are in contact with the back of the school children, and the rigid sewn portions 24 and 24 provided on the surface of the inner folding connecting piece are not in contact with the back of the school children. .

  Further, the both side edges 2b, 2b of the backpack of the school bag are sewn by being hooked on the inner side of the narrow inner fold connecting pieces 30, 30 provided at the ends of the side plates located at both ends of the storage member. Since the protrusions 13 called “edge portions” are not provided on both side ends of the back plate, the outer surfaces of the side portions of the school bag can be formed flat. As described above, the strength of the lower portion of the main housing portion 36 provided in the housing member 26 can be increased by the bottom surface portion 38. Further, by attaching the reinforcing piece 40, 40a inside the bent portion of the upper opening 37 of the school bag, the strength of the upper part of the school bag is increased to prevent deformation, and the outer shape is smart and small in size so that it can be handled easily. Has the advantage.

It is a perspective view which shows the principal part of the school bag which abbreviate | omitted the backpack belt. It is a perspective view of the state which isolate | separated before combining the back plate which comprises a school bag, and a storage member. It is a top view of a back plate. It is the top view which expanded the storage member. It is the perspective view which fixed the inner folding connection piece provided in the edge part of the both-sides surface board of a storage member, and the both-sides end of a backing plate, and showed the bottom face part before sewing. FIG. 6 is a cross-sectional view taken along line AA in FIG. 5. It is sectional drawing which shows the main accommodating part of another Example. It is a perspective view which shows the opening part of the main accommodating part which fractured | ruptured the cover plate. It is explanatory drawing which shows the upper opening of a main accommodating part. It is explanatory drawing of the state which attached the reinforcement part piece to the upper opening of the main accommodating part. It is explanatory drawing of the state which attached the other reinforcement part piece. It is a BB line direction sectional view of Drawing 1. It is the perspective view which showed the principal part of the conventional school bag.

Explanation of symbols

21 Back plate 21a Back plate bottom piece 21b Side end portion 22 First folding line 23 First arcuate portion 23a Notch portion 24 Sewn portion 26 Storage member 27 Front plate 27a Front plate bottom piece 28 Folding curve portion 29 Side plate 29a Side plate Bottom piece 30 Inner fold connecting piece 30a Lower end 31 Second fold line 32 Third fold line 33 Second arcuate part 33a Notch part 34 Notch recess part 36 Main accommodating part 37 Upper opening 38 Bottom face part 39 Reinforcement bottom plate 40 Reinforcement part piece 40a Reinforcement piece

Claims (6)

A back plate (21) having a back plate bottom piece (21a) below;
Side plates (28, 28) provided on both sides of a front plate (27) formed to be equal to the width of the back plate (21) and having a front plate bottom piece (27a) on the lower side through folding lines (28, 28). 29, 29) each provided with a side plate bottom piece (29a, 29a) and a storage member (26) provided with a narrow inner connecting piece (30, 30) at the end of each side plate,
Main ends provided on the inner side of the back plate with both end portions (21b, 21b) hooked inside the inner folding connecting pieces (30, 30) and both side portions of the back plate are sewn and fixed. Forming an upper opening (37) in the upper part of the housing part (36);
The back plate bottom piece (21a), the front plate bottom piece (27a), and the side plate bottom pieces (29a, 29a) are folded inward in order, and a reinforcing bottom plate (39) is attached and fixed together to fix the bottom portion (38). A school bag characterized by being provided.   The back plate (21) is directed to both side ends of a back plate bottom piece (21a) formed below a first horizontal folding line (22) provided at a lower portion from the end of the folding line to the inside. The school bag according to claim 1, wherein the first arcuate part (23) is provided with a notch (23a, 23a).   The storage member (26) includes a second folding line (31) in the horizontal direction on the same line below the front plate (27) and the side plates (29, 29) provided in the same width as the back plate. And a third fold line (32), and a lower end (30a) is formed at a position matching the fold line at the lower part of the narrow inner fold connecting pieces (30, 30) provided on both side ends, Notch portions (33a, 33a) are formed on both side ends of the side plate bottom pieces (29a, 29a) continuously to the second arcuate portions (33, 33) provided continuously to the lower end portions, and the front plate bottom pieces The school bag according to claim 1, wherein a notch recess (34, 34) having an arcuate upper portion is provided between a side end of (27a) and a side end of the side plate bottom piece (29a, 29a). . A back plate (21) having a back plate bottom piece (21a) below;
Side plates (28, 28) provided on both sides of a front plate (27) formed to be equal to the width of the back plate (21) and having a front plate bottom piece (27a) on the lower side through folding lines (28, 28). 29, 29) each provided with a side plate bottom piece (29a, 29a) and a storage member (26) provided with a narrow inner connecting piece (30, 30) at the end of each side plate,
Main housing provided in the inner side of the back plate with both side ends (21b, 21b) hooked on the inside of the inner folding connecting pieces (30, 30) and both side portions of the back plate are sewn and fixed. Forming an upper opening (37) on top of the part (36);
A reinforcing piece is mounted inside the bent portion of the upper opening (37),
The back plate bottom piece (21a), the front plate bottom piece (27a), and the side plate bottom pieces (29a, 29a) are folded inward in order, and a reinforcing bottom plate (39) is attached and fixed together to fix the bottom portion (38). A school bag characterized by being provided.   On both sides of the back plate on the inner side of the narrow inner fold connecting pieces (30, 30) connected to the end portions of the side plates (29, 29) provided on both sides of the front plate constituting the storage member (26). The ends (21b, 21b) are hooked to provide the sewn portions (24, 24) and are sewn and fixed to provide the main accommodating portion (36) inside, and the back plate bottom piece (21a) and the front plate bottom piece (27a) and both side plate bottom pieces (29a) are each folded inward and fixed to form a bottom surface portion (38) at the lower portion and an upper opening (37) of a main housing portion (36) provided inside, The school bag according to claim 4, wherein L-shaped reinforcing portions (40a, 40a) are respectively provided inside bent portions of the back plate and the side plates. On both sides of the back plate on the inner side of the narrow inner fold connecting pieces (30, 30) connected to the end portions of the side plates (29, 29) provided on both sides of the front plate constituting the storage member (26). The end portions (21b, 21b) are hooked and the sewn portions (24, 24) are provided and sewn and fixed to provide the main housing portion 36 inside. The back plate bottom piece (21a) and the front plate bottom piece ( 27a) and both side plate bottom pieces (29a) are folded inward and fixed to form a bottom surface portion (38) at the lower portion, and the upper opening (37) of the main housing portion (36) provided inside is provided with the back 5. The school bag according to claim 4, further comprising a U-shaped reinforcing piece (40, 40) on the inner side of each bent portion of the plate, both side plates, and the front plate.

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