JP2016120057A - School bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a school bag whose capacity is freely variable in accordance with the volume of contents.SOLUTION: The school bag includes: a body part 3 composed of a large gusset part 5 which is continuously provided upward in the bottom part 4 and both ends of the bottom part; a back plate 7 arranged on the rear side of the body part; a main storage part 2 having a front plate 6 arranged on the front side of the body part; a lid 11 which freely openably/closeably shuts the upper opening in the main storage part; and a shoulder belt 12 attached to the back plate side. The body part is structured with: a fixed side connection tube 16a which is protruded on the back plate side toward the front plate side; and a movable side body part 23 which is protruded on the front plate side toward the back plate side, which is fixed to a frame 14 having a movable side connection tube 16b that is freely slidably connected to the fixed side connection tube, and which is freely slidably connected to the fixed side body part 22. As a result, the body part is made freely expandable and contractable in the width in the front and the rear directions.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a school bag, and more particularly, to a school bag in which the capacity of a storage portion can be freely changed.

  A school bag represented by a school bag is generally attached to the body composed of a bottom plate and a large gusset that is connected to both ends of the bottom plate in the upward direction, and the back side of the body. A main housing part having an opening in the upper part, which is composed of a back plate and a front plate attached to the front side of the body part, is provided with a lid for opening and closing the upper opening. Furthermore, a pair of shoulder belts are attached to the back plate.

  That is, FIG. 10 is a perspective view showing a general school bag 31, in which 33 is a trunk. The body portion 33 is composed of a bottom plate 34 and large gusset portions 35 connected to both ends of the bottom plate 34 in an upward direction. A back plate 36 is provided on the back side of the body portion 33. A front plate 37 is attached to the front side of the body portion 33, thereby constituting a main housing portion 32 having an upper portion as an opening.

  Further, a middle gusset portion 39 having a bottom portion is attached to the front side of the main housing portion 32, and a front plate 40 is attached to the front side of the middle gusset portion 39. The front plate 40 constitutes a front cylinder accommodating portion 38 having an upper portion as an opening.

  On the other hand, the main housing portion 32 is arranged so as to be openable and closable so as to cover from the upper opening of the main housing portion 32 to the upper opening of the torso front housing portion 38, and a lid 41 on the back plate 36 side. The proximal end is attached.

  A pair of shoulder belts 42 is attached to the back plate 36. That is, each of the pair of shoulder belts 42 has an upper end attached to the back plate 36 by a back ring 44 attached to an upper center portion of the back plate 36, and a lower end portion attached to the bottom plate 34, respectively. The lower belt 43 is rotatably attached to a so-called “daruma ring” (not shown).

  By the way, in the conventional school bag comprised as mentioned above, since the size of the main accommodating part was fixed and the capacity of the main accommodating part could not be changed, there are few items such as textbooks. However, it was pointed out that textbooks would swing in the school bag, making it difficult to carry.

  In particular, in the lower grades of elementary school, less textbooks are used due to the less number of classes, which often causes textbooks to sway in the school bag. In the school year, the entire school bag is larger than the size of the body, so if textbooks swing in the school bag, the school bag will become more difficult to carry and the burden on the child will increase. was there.

  On the other hand, as the number of textbooks increases in the upper grades, it becomes impossible to put all the luggage into the main containment section, and it is necessary to have a handbag or bag in addition to the school bag. At the same time, there is a risk of falling when both hands are blocked, and in the case of falling, there is a possibility that both hands are blocked, resulting in a large injury.

  Therefore, conventionally, in order to solve such problems of the school bag, a configuration in which the capacity of the main housing portion is variable has been proposed.

JP 2001-286316 A Utility Model Registration No. 3072362 Utility Model Registration No. 3073139 Japanese Patent Laid-Open No. 08-24024 Utility Model Registration No. 3190801

  However, the conventional school bag having a variable capacity of the main storage portion has either a configuration that reduces the storage amount relative to the normal storage amount or a configuration that increases the storage amount relative to the normal storage amount. Therefore, the amount of accommodation cannot be freely changed with respect to the normal capacity.

  Therefore, conventionally, when there are few textbooks etc., it is possible to reduce the amount of storage and prevent the textbooks etc. from swinging in the school bag, and even if the textbooks etc. increase in the upper grades, No school bag with a main compartment that can be changed to a capacity that can be fully accommodated has been provided.

  Then, this invention makes it a subject to provide the school bag which can change a volume freely according to the quantity of the accommodation.

The school bag of the present invention
A trunk portion composed of a bottom portion and a large gusset portion continuously provided on both ends of the bottom portion; a back plate disposed on the back side of the trunk portion; and disposed on the front side of the trunk portion. A main housing portion having an upper opening, a lid portion for opening and closing the upper opening of the main housing portion, and a shoulder belt attached to the back plate side. do it,
The body portion projects to the back plate side toward the front plate side, and the fixed side connection tube projects from the front plate side toward the back plate side and is slidable to the fixed side connection tube. It is characterized in that it is fixed to a frame frame provided with a connected movable side connecting pipe, and the width in the front-rear direction is made extendable.

  The school bag according to the present invention includes a trunk portion composed of a bottom portion and a large gusset portion continuously provided at both ends of the bottom portion, a back plate disposed on the back side of the trunk portion, and the trunk portion. A main plate having a front plate disposed on the front side of the unit; a lid for opening and closing the upper opening of the main bag so as to be openable; and a shoulder belt attached to the back plate. In the school bag, the fixed side connecting tube that protrudes toward the front plate toward the back plate side and the movable side that protrudes toward the back plate side toward the front plate side and is slidably connected to the fixed side connecting tube A frame frame provided with a connecting pipe is provided, and a body portion is fixed to the frame frame. Further, the body portion is extendable in the front-rear direction.

  Therefore, in the school bag of the present invention, the ratio of the sliding of the movable side connecting pipe to the fixed side connecting pipe constituting the frame frame is adjusted, and the width of the trunk portion in the front-rear direction is expanded and contracted, thereby The capacity can be changed freely. Therefore, the school bag of the present invention can solve the problem that textbooks or the like swings in the school bag when there are few items to be stored, thereby making it difficult to carry the school bag. Even if there are many things, it is possible to eliminate having to carry a lot of handbags in addition to school bags.

It is a perspective view of the Example of the school bag of this invention. It is an exploded view for demonstrating the main accommodating part in the Example of the school bag of this invention. It is a figure for demonstrating the frame in the Example of the school bag of this invention. It is a figure for demonstrating the frame in the Example of the school bag of this invention. It is a figure for demonstrating the trunk | drum in the school bag of this invention. It is a figure for demonstrating the other structure of the trunk | drum in the school bag of this invention. It is a figure for demonstrating the other structure of the trunk | drum in the school bag of this invention. It is a figure for demonstrating the other structure of the trunk | drum in the school bag of this invention. It is a figure for demonstrating the other structure of the trunk | drum in the school bag of this invention. It is a figure for demonstrating the conventional school bag.

  The school bag according to the present invention has a main housing part with an opening at the top, and the main housing part is composed of a bottom part and a body part composed of a large gusset part continuously connected to both ends of the bottom part. And a back plate disposed on the back side of the body part and a front plate disposed on the front side of the body part. Moreover, the school bag of the present invention includes a lid portion for closing the upper opening of the main housing portion so as to be openable and closable, and a backpack belt attached to the back plate side.

  Furthermore, the school bag of the present invention has a frame frame, and the body portion is fixed to the frame frame. The frame frame includes a fixed side connecting pipe arranged to protrude toward the front plate side on the back plate side, and a movable side connecting pipe arranged to protrude toward the back plate side on the front plate side. The movable-side connecting pipe is slidably connected to the fixed-side connecting pipe, and the trunk portion is extendable in the front-rear direction.

  Here, the body part is slidably connected to the fixed side bottom part and the fixed side body part including the fixed side large gusset part continuously connected to both ends of the fixed side bottom part, and the fixed side bottom part. The movable-side bottom portion and the movable-side body portion including the movable-side large gusset portion that is connected to both ends of the working-side bottom portion in the upward direction and is slidably connected to the fixed-side large gusset portion. Thereby, the width | variety to the front-back direction can make a trunk | drum flexible.

  In addition, a fixed-side trunk portion including a fixed-side bottom portion and a fixed-side large gusset portion continuously connected to both ends of the fixed-side bottom portion, and an accordion shape that is extendable in the front-rear direction. The movable side body portion may be configured such that one end of the movable side body portion may be connected to the fixed side body portion, and the body portion can also be extended and contracted in the front-rear direction. In this case, the fixed-side body part and the movable-side body part may be disposed at any location, the fixed-side body part is disposed on the back plate side, and the movable-side body part is disposed on the front plate side, the fixed-side body part. Is arranged on the front plate side and the movable side body portion is arranged on the back plate side, or the fixed side body portion is arranged on the back plate side fixed side body portion and the front plate side. It may be configured by a fixed-side body portion on the front plate side, and a movable-side body portion may be disposed between the fixed-side body portion on the back plate side and the body portion on the front plate side.

  In addition, the body portion may be made of a stretchable elastic material such as rubber so that the body portion can be stretchable in the front-rear direction.

  An embodiment of the school bag of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the front side of the school bag of the present embodiment, and in the figure, 1 is the school bag of the present embodiment.

  And the school bag 1 of a present Example has the main accommodating part which made upper part the opening, and can accommodate a textbook, a notebook, a pencil case, etc. in this main accommodating part. That is, in FIG. 2, reference numeral 2 denotes a main housing portion. In the present embodiment, the main housing portion 2 has a body portion 3, and the body portion 3 is located above the bottom portion 4 and both ends of the bottom portion 4. It is comprised with the large gusset part 5 connected in the direction. Further, a back plate 7 is attached to the back side of the body portion 3, and a front plate 6 is attached to the front side of the body portion 3, thereby constituting a main housing portion 2 having an upper portion as an opening. Has been.

  Further, in the school bag 1 of the present embodiment, the middle gusset portion 9 having a bottom portion is attached to the front side of the main housing portion 2 and the front side of the middle gusset portion 9 as in the general school bag. A front plate 10 is attached, and thereby, a front cylinder housing portion 8 having an upper opening is formed on the front side of the main housing portion 2.

  Next, reference numeral 11 denotes a lid. That is, in the school bag 1 of the present embodiment, the lid 11 is provided so as to cover the upper opening of the main housing portion 2 to the upper opening of the torso housing portion 8 in an openable and closable manner. The lid 11 has a proximal end attached to the upper side of the back plate 7 and a distal end portion that is a free end. The lid 11 is detachably locked to the lower surface side of the trunk portion 3 by a metal fitting (not shown). Has been. However, in the present invention, the lid 11 does not necessarily have such a configuration, as long as it can cover the upper opening of the main housing part 2 to the upper opening of the front cylinder housing part 8 so as to be openable and closable.

  In addition, a pair of shoulder belts 12 are attached to the back plate 7, and the shoulder belts 12 have respective upper ends via shoulder belt upper end fittings 13 attached to the upper central portion of the back plate 7. Attached to the back plate 7. The lower end of the shoulder belt 12 is connected to a so-called “dharma ring” (not shown) attached to the lower surface of the body 3. However, in the present invention, the shoulder belt 12 is not necessarily configured as described above, and may be configured in any way as long as the main housing portion 2 can be carried on the back.

  Next, FIG. 2 is an exploded view of the configuration of the school bag 1 of the present embodiment excluding the lid 11 and the shoulder belt 12, and in the figure, 3 is the trunk. In the present embodiment, the body portion 3 has a gate shape that is upside down, and is fixed to the frame frame, and the width in the front-rear direction can be expanded and contracted.

  Here, the frame frame will be described. In FIG. 2, 14 is a frame frame, and FIG. 3 is a diagram showing the frame frame. In this embodiment, the frame frame 14 is composed of a fixed side frame frame and a movable side frame frame, and the movable side frame frame is slidable to the fixed side frame frame side and coupled to the fixed side frame frame. Yes.

  That is, in the figure, 14a is a fixed side frame frame. In the present embodiment, the fixed side frame frame 14a has a pair of columns 15a attached to the back plate 7, and an upper part and a lower part of the column 15a. Each has a cylindrical fixed-side connecting pipe 16a projecting toward the front plate 6 side. Further, the support column 15a is connected to the upper portion and the lower portion by a rod-like reinforcing connecting portion 17a. However, the reinforcing connecting portion 17a is not necessarily required, and may be configured without this.

  Next, 14b is a movable side frame frame in the figure, and in this embodiment, the movable side frame frame 14b has a pair of support columns 15b attached to the front plate 6. A cylindrical movable-side connecting pipe 16b projects from the upper portion and the lower portion of the support column 15b toward the back plate 7, and the support column 15b has a rod-like shape at the upper and lower portions. They are connected by a reinforcing connecting portion 17b.

  In the present embodiment, the movable side connecting pipe 16b is slidably connected to the fixed side connecting pipe 16a. This relationship will be described with reference to FIG. 4. FIG. 4 is a longitudinal sectional view showing the configuration of the connecting portion between the fixed side connecting pipe 16a and the movable side connecting pipe 16b. In the figure, the movable side connecting pipe 16b is shown in FIG. The outer diameter of the fixed side connecting pipe 16a is such that it can be inserted into the fixed side connecting pipe 16a.

  Further, a locking projection 18 urged to the outer peripheral side by a spring 19 is provided in the vicinity of the distal end side of the movable side connecting tube 16b. The locking projection 18 has a distal end portion of the movable side connecting tube 16b. It penetrates the through hole 20 formed in the side wall, and protrudes removably on the outer peripheral side of the movable side connecting pipe 16b.

  On the other hand, a plurality of locking holes 21 into which the distal end portions of the locking projections 18 can be inserted are formed in the side walls of the fixed-side connecting pipe 16a, and the locking projections 18 are formed in the locking holes 21. The position of the movable side connecting pipe 16b can be fixed by inserting. That is, when the movable side connecting pipe 16b is slid with respect to the fixed side connecting pipe 16a, the locking projection 18 is pressed by the inner wall of the fixed side connecting pipe 16a and retracts to the inner peripheral side, and the location of the locking hole 21 is reached. , The inner wall of the fixed side connecting pipe 16a disappears, so that it protrudes to the outer peripheral side and is inserted into the locking hole 21, whereby the position of the movable side connecting pipe 16b is fixed. Therefore, the movable side connecting pipe 16b is slidable with respect to the fixed side connecting pipe 16a, and the sliding position relative to the fixed side connecting pipe 16a is changed by changing the locking position of the locking projection 18 and the locking hole 21. It is possible to adjust the ratio arbitrarily.

  Next, in the drawing, a fixed-side stopper 27a is projected on the inner peripheral side of the distal end portion of the fixed-side connecting tube 16a, while the hook-shaped movable side is provided on the outer peripheral side of the distal end portion of the movable-side connecting tube 16b. The stopper 27b is provided around, so that when the movable side connecting pipe 16b is slid in the direction of pulling out from the fixed side connecting pipe 16a, the movable side stopper 27b comes into contact with the fixed side stopper 27a, and the movable side connecting pipe 16b. Is prevented from coming off.

  In the present invention, the frame frame 14 does not necessarily require the reinforcing connecting portion 17b and may not use it. Even when the reinforcing connecting portion is used, the upper portion of the support columns 15a and 15b and There is no need to connect both of the lower portions, and either an upper portion or a lower portion of the support columns 15a and 15b may be connected. Further, in the present invention, the fixed side connecting pipe 16a may be slidably inserted into the movable side connecting pipe 16b. Furthermore, it is good also as a structure which does not provide the support | pillars 15a and 15b, attaches the fixed side connection pipe | tube 16a to the backplate 7, and attaches the movable side connection pipe | tube 16b to the front board 6. FIG.

  Next, the trunk 3 fixed to the frame frame 14 configured as described above will be described. In the present embodiment, the trunk 3 includes a fixed-side trunk having a width in the front-rear direction, and the fixed-side trunk. It has a movable side body part that is slidable with respect to the part and thereby can be expanded and contracted in the front-rear direction, and the movable side body part also has a width in the front-rear direction.

  That is, in FIG. 2, reference numeral 22 denotes a fixed-side body portion. The fixed-side body portion 22 has a plate-like fixed-side bottom portion 2201, and both ends of the fixed-side bottom portion 2201 face upward. Thus, a fixed large gusset portion 2202 is provided continuously.

  On the other hand, in the figure, reference numeral 23 denotes a movable side body, and this movable side body 23 includes a plate-shaped movable side bottom 2301 and a movable side continuously provided upward at both ends of the movable side bottom 2301. A large gusset portion 2302 is provided, and the outer diameter of the large gusset portion 2302 is substantially the same as the inner diameter of the fixed-side body portion 22 so that the fixed-side body portion 22 can be inserted. The fixed side bottom 2201 and the movable side bottom 2301 constitute the bottom 4, and the fixed side large gusset 2202 and the movable large gusset 2302 constitute the large gusset 5.

  Here, FIG. 5 is a longitudinal front view of a portion where the fixed-side body portion 22 and the movable-side body portion 23 are connected, and in the figure, the fixed-side body portion 22 and the movable-side body portion 23 are mutually connected. A fitting convex part 24 and a fitting concave part 25 are formed on the opposing surfaces in the front-rear direction, and the fitting convex part 24 in the fixed-side trunk part 22 becomes the fitting concave part 25 in the movable-side trunk part 23. The fitting convex part 24 in the movable side body part 23 is fitted in the fitting concave part 25 in the fixed side body part 22 and the movable side body part 23 slides on the fixed side body part 22. It is connected freely, and the width of the body part 3 in the front-rear direction is made extendable.

  The trunk portion 3 is placed on the frame frame 14 in such an arrangement that the bottom portion 4 is disposed on the lower connection pipes 16a and 16b in the frame frame 14, and the column 3 is supported by the column of the fixed side frame frame 14a. One end side of the fixed-side body portion 22 is connected to 15a, and one end side of the movable-side body portion 23 is connected to the support column 15b of the movable-side frame frame 14b, whereby the body portion 3 is fixed to the frame frame 14.

  However, the method of making the width of the body part 3 in the front-rear direction is not limited to this method, and other methods may be adopted. For example, FIG. 6 is a diagram for explaining another configuration of the body part 3 of the present invention. In the figure, 22 is a fixed side body part, 23 is a movable side body part, and the movable side body part 23 in FIG. It is in the shape. That is, cloth, resin, etc. can be expanded and contracted in the form of an accordion to form the movable body 23, and one end thereof is connected to the fixed body 22 to form the body 3.

  Then, it is placed on the lower connection pipes 16a and 16b in the frame frame 14, one end side of the fixed-side body portion 22 is connected to the column 15a of the fixed-side frame frame 14a, and the column 15b of the movable-side frame frame 14b is connected to the column 15b. One end side of the accordion-shaped movable side body 23 is connected, and thereby the body 3 is fixed to the frame 14.

  On the other hand, the body part 3 shown in FIG. 7 has a configuration in which the arrangement of the fixed side body part 22 and the movable side body part 23 in the body part 3 shown in FIG. 6 is reversed. That is, an accordion-shaped movable side body portion 23 is disposed on the back plate side, and the front side of the movable side body portion 23 is connected to the fixed side body portion 22 to constitute the body portion 3. The body 3 is placed on the lower connection pipes 16a and 16b in the frame frame 14, the movable side body 23 is connected to the support column 15a of the fixed side frame 14a, and one end of the fixed side body 22 is connected. The body 3 may be configured in such a manner as to be connected to the column 15b of the movable side frame 14b.

  Further, the body shown in FIG. 8 has two body parts having a large gusset part continuously connected to the bottom plate and both ends of the bottom plate, and one body part is connected to the column 15a of the fixed side frame frame 14a. Then, as the fixed body 22b on the back plate side, the other body is connected to the column 15b of the movable frame frame 14a as the fixed body 22b on the back plate, and as the fixed body 22c on the front plate side. An accordion-shaped movable side body 23 is disposed between the front side 22b and the fixed side body 22c on the front plate side, and the body 3 may be configured in this way.

  And when adopting the accordion-shaped movable side body 22b, the bottom part and the large gusset part may all be accordion-like, but as shown in FIGS. The slide base 26 may be slidably connected to the fixed-side bottom portion 2201 of the fixed-side body portion 22.

  Furthermore, in the trunk section 3 shown in FIG. 9, the entire trunk section 3 is made of elastic hard rubber, and is placed on the lower connecting pipe 16 in the frame frame 14 and fixed. One end side is connected to the support of the side frame frame 14a, and the other end side of the movable side frame frame 14b is connected, so that it can be expanded and contracted in the front-rear direction and fixed to the frame frame 14. 3 may be configured.

  In the above description, both the fixed-side frame frame 14a and the movable-side frame frame 14b have the columns 15a and 15b, and the fixed-side coupling tube 16a and the movable-side coupling tube 16b protrude from the columns 15a and 15b. In addition to this, as described above, the fixed side connecting pipe 16a is protruded from the back plate 7 and the movable side connecting pipe 16b is protruded from the front plate 6 without the support, as described above. The frame frame 14 may be configured by only the fixed side connecting pipe 16a and the movable side connecting pipe 16b.

  Next, the operation of the school bag 1 of the present embodiment configured as described above will be described. When there are few items such as textbooks, the movable frame 14b is moved in the front-rear direction with respect to the fixed frame 14a. Slide in the direction to shorten the length of. If it does so, the width | variety of the front-back direction of the trunk | drum 3 can be shrunk | reduced, the capacity | capacitance of the main accommodating part 2 can be decreased, and it can prevent that a textbook etc. rock | fluctuate inside the main accommodating part 2. FIG.

  On the other hand, when there are many items such as textbooks, the movable side frame 14b is slid in the direction in which the length in the front-rear direction extends with respect to the fixed side frame 14a. If it does so, the width | variety of the front-back direction of the trunk | drum 3 can be extended, the capacity | capacitance of the main accommodating part 2 can be increased, and it can accommodate many loads.

  At this time, in this embodiment, the locking projection 18 is removably projected to the inner peripheral side on the outer peripheral side of the movable side connecting tube 16b, and the locking projection is locked to the fixed side connecting tube 16a. Since the hole 21 is formed, the ratio of the slide with respect to the fixed side connecting pipe 16a can be arbitrarily adjusted by changing the locking position of the locking projection 18 and the locking hole 21, thereby It is possible to fix the width | variety of the front-back direction of the trunk | drum 3 by arbitrary widths.

  As described above, the school bag according to the present embodiment includes the fixed-side frame frame 14a and the frame frame 14 that is slidably connected to the fixed-side frame frame 14a so that the length in the front-rear direction can be expanded and contracted. In addition, the main housing portion 2 is fixed to the frame frame 14 and the body portion 3 constituting the main housing portion has a width in the front-rear direction that can be expanded and contracted. Therefore, the movable side frame frame 14b is fixed to the fixed side frame frame 14a. By changing the ratio of the slide, it is possible to change the capacity of the main housing part 2 freely by changing the width of the body part 3 in the front-rear direction.

  Therefore, in the school bag of the present embodiment, when there are few items to be accommodated, the textbook etc. can be swung in the school bag, thereby making it difficult to carry the school bag. Even if there are many items to be stored, it is possible to eliminate having to carry a lot of handbags in addition to school bags.

  Since the volume of the school bag of the present invention can be varied in accordance with the amount of the contents, the school bag can be applied to any bag in which the contents may change.

DESCRIPTION OF SYMBOLS 1 School bag 2 Main accommodating part 3 Trunk part 4 Bottom plate 5 Large gusset part 6 Front board 7 Back board 8 Front trunk accommodating part 9 Middle gusset part 10 Front board 11 Lid 12 Shoulder belt 13 Shoulder belt upper end attachment ring 14 Frame frame 14a fixation Side frame frame 14b Movable side frame frames 15a, 15b Strut 16 Connecting pipe 16a Fixed side connecting pipe 16b Movable side connecting pipes 17a, 17b Connecting portion 18 Locking protrusion 19 Spring 20 Through hole 21 Locking hole 22 Fixed side body 2201 Fixed Side bottom 2202 Fixed side large gusset portion 23 Movable side body portion 2301 Movable side bottom portion 2302 Movable side large gusset portion 22b Back plate side body portion 22c Front plate side body portion 24 Fitting convex portion 25 Fitting concave portion 26 Slide base 27a Fixed side Stopper 27b Movable side stopper

Claims (7)

Arranged on the back side of the body part (3), which is composed of a bottom part (4) and a large gusset part (5) connected to both ends of the bottom part (4) upward. A main housing portion (2) having an opening at the top, comprising a back plate (7) formed, and a front plate (6) disposed on the front side of the body portion (3); A lid (11) for freely opening and closing the upper opening in (2), and a shoulder belt (12) attached to the back plate (7) side;
The trunk portion (3) includes a fixed side connecting pipe (16a) projecting toward the front plate (6) on the back plate (7) side, and the back plate (6) on the front plate (6) side. 7) It is fixed to a frame frame (14) having a movable side connection pipe (16b) that protrudes toward the side and is slidably connected to the fixed side connection pipe (16a), and in the front-rear direction. The school bag is characterized by its adjustable width. The trunk (3)
A fixed-side body (22) having a fixed-side bottom (2201) and a fixed-side large gusset (2202) connected to both ends of the fixed-side bottom (2201) upward;
A movable side bottom (2301) slidably connected to the fixed side bottom (2201), and both ends of the movable side bottom (2301) are connected upward, and the fixed side large gusset (2202). The school bag according to claim 1, further comprising: a movable side large gusset portion (2302) slidably connected to the movable side trunk portion (23). The trunk portion (3) includes a fixed-side trunk portion (2202) and a fixed-side large gusset portion (2202) continuously connected to both ends of the fixed-side bottom portion (2201). 22)
The school bag according to claim 1, characterized by comprising: a movable side body (23) having one end side connected to the fixed side body (22) and having an accordion shape that is extendable in the front-rear direction. .   The school bag according to claim 3, wherein the fixed-side body (22) is disposed on the back plate (7) side, and the movable-side body (23) is disposed on the front plate (6) side. .   The school bag according to claim 3, wherein the fixed-side body (22) is disposed on the front plate (6) side, and the movable-side body (23) is disposed on the back plate (7) side. . The fixed-side body (22) is arranged on the back plate (7) side, the fixed-side body portion (22b) on the back plate side, and the fixed-side body portion on the front plate side (6) is arranged on the front plate side (22). 22c), and
Between the fixed side trunk part (22b) on the back plate side and the fixed side trunk part (22c) on the front plate side, a movable side trunk part (23) having an accordion shape that is extendable in the front-rear direction is disposed. The school bag according to claim 3, wherein   The school bag according to claim 1, wherein the body (3) is made of a stretchable elastic material, and has a width in the front-rear direction that can be stretched.

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