JP2006096382A - Returnable case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a returnable case which can be changed in size into any of a plurality of modules when assembled and can be folded to reduce its length when disassembled. <P>SOLUTION: The returnable case 1, which can be assembled and disassembled, comprises: a skid 2 forming a bottom frame; a pair of freely detachable short side frames 3 vertically attached to both short sides 22a of a rectangular frame forming the skid 2; and a pair of freely detachable long side frames 5 vertically attached to the opposite long sides of the frame of the skid 2. The skid 2 and the long side frames 5 have telescopic members S which vary in length by sliding lengthwise. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a returnable case that can be used for transportation of luggage, can be assembled and disassembled, and can be made compact.

The conventional returnable case includes a skid that forms a bottom frame, a frame-like short side frame that stands on the front and back of the skid, a frame-like long side frame that stands on the left and right of the skid, and a left and right long frame. It is comprised from the reinforcement arm which connects a side frame, and is assembled by bolting those members (for example, refer patent document 1).
Returnable cases are generally used as 4 to 10 module returnable cases depending on the size of the package and the country of destination, such as when knocking parts of automobiles or two-wheeled vehicles are transported by ship. Has been.
The size of the returnable case is standardized on the basis of one module for improving workability such as transportation and loading / unloading and transportation.
Here, “module” refers to one unit obtained by equally dividing a container.
JP-A-10-278929 (paragraphs 0007 to 0014, FIG. 1)

  However, in the returnable case as described in Patent Document 1, all the skeletal members forming the skid and the long side frame are welded to form a frame shape, and the size cannot be changed. For this reason, it is necessary to prepare a number of returnable cases of several different module sizes that are compatible with the standard dimensions of shipping containers and the size of luggage. There was a lot of waste in terms of management man-hours and other problems.

Further, the returnable case is assembled by bolting the skid, the short side frame, and the long side frame, respectively, from the need to ensure rigidity. At the time of collection for transporting the cargo and then returning it to the container, the returnable case can be disassembled and stacked so that the short side frame and the long side frame are folded on the skid to make it compact in the height direction.
However, since conventional returnable cases use bolts and nuts, there are many parts, assembly man-hours, assembly time, and parts management man-hours. It was bad and a problem.

  Furthermore, since the conventional returnable case cannot make the skid or the long side frame small, the occupied space when folded cannot be made smaller than the area of the skid. For this reason, the transport space in the container cannot be effectively used, which is a problem.

  Accordingly, the present invention has been invented to solve the above-mentioned problems, and the problem of the present invention is that it can be changed to the size of a plurality of modules at the time of assembly, and can be folded with a reduced length at the time of disassembly. Is to provide a returnable case.

  In order to solve the above-mentioned problem, a returnable case according to claim 1 includes a rectangular skid forming a bottom frame, a pair of short side frames detachably provided on a short side of the skid, In a returnable case that can be assembled and disassembled, comprising a pair of long side frames detachably provided on the long side of the skid, the skid and the long side frame slide in the long side direction and have a length. It has a variable elastic member.

According to the first aspect of the present invention, the returnable case has an elastic member whose length is variable by sliding the skid and the long side frame in the long side direction, so that the length in the long side direction can be increased during assembly and disassembly. You can change the size by increasing or decreasing the length. When transporting relatively small loads, for example, the returnable case is reduced to 10 modules and used. When transporting relatively large loads, the returnable case is expanded to 8 modules and used. be able to. Since the returnable case can be used by changing one returnable case into two sizes, it is possible to make the returnable case have a predetermined size that conforms to various shapes of luggage and the standards of each country. As a result, one returnable case can be transformed into one suitable for a plurality of modules, so that the number of types of returnable cases that must be prepared and placed can be halved. The
In addition, when disassembling, it is possible to stack a large number of returnable cases in a narrow space by shortening and folding the returnable case, thus creating an empty space where other packages can be loaded in the returned container. Can do. As described above, the returnable case can be enlarged when the luggage is transported to store the luggage and can be folded small when the luggage is returned, thereby improving transport efficiency.

  The returnable case according to claim 2 is the returnable case according to claim 1, wherein the pair of short side frames are arranged in parallel with each other, and the upper side frame member is arranged on the upper side to form a quadrangle. The upper frame member is supported by a reinforcing arm that slides and has a variable length.

  According to the second aspect of the present invention, the pair of short side frames are stably maintained at an appropriate length between the two because the upper side frame member is supported by the reinforcing arm. Therefore, the assembled returnable case is separated by an external force and the like so that the short side frame is prevented from falling or rattling, and the distance between the two short side frames can always be maintained in parallel. The rigidity of the upper part of the case is ensured. On the other hand, since the length of the reinforcing arm can be varied, the reinforcing arm can be stored compactly at the time of disassembly.

  The returnable case according to claim 3 is the returnable case according to claim 1 or 2, wherein the elastic member includes an outer frame member extending in a long side direction, and an inner portion of the outer frame member. And a lock mechanism that locks the outer frame member and the inner frame member.

  According to the invention described in claim 3, the expansion and contraction member expands and contracts in the long side direction by the outer frame member and the inner frame member slidably inserted into the outer frame member, and the outer frame member by the lock mechanism. And the inner frame member can be locked and held in a predetermined position. For this reason, even if the returnable case is subjected to vibration during transportation or external force in the direction in which the expansion / contraction member expands / contracts, the returnable case is held at a standard length of a predetermined module to ensure the rigidity of the case.

  The returnable case according to claim 4 is the returnable case according to any one of claims 1 to 3, wherein the pair of short side frames and the pair of long side frames are viewed in plan view. The upper end portions adjacent to each other are removably connected with a connecting truss, and the connecting truss has the lower end portion removably connected to the skid. And

  According to the invention described in claim 4, the skid, the short side frame, and the long side frame are connected by the connecting truss so that the long side can be assembled with one touch without using a fastening member such as a bolt and a nut. The arm can be reinforced, and the number of components, assembly man-hours, component management man-hours and costs can be reduced. Further, since the connecting truss is assembled to the truss structure, the rigidity of the long side frame itself can be improved, and the short side and the long side frame can be firmly erected so as not to fall down.

  The returnable case according to claim 5 is the returnable case according to claim 4, wherein the skid is detachably connected to the lower edge portions of the short side frame and the long side frame which are adjacent to each other. And a connecting piece provided with a through-hole into which a lower pin installed at the lower end portion of the connecting truss is inserted, and installed at the upper end portion of the short side frame at the upper end portion of the connecting truss A connecting member having a connecting hole for engaging the upper pin is provided, and the long side frame has a connecting hole for inserting the upper pin together with the connecting hole of the short side frame. A connecting portion reinforcing plate provided with a connecting hole into which the lower pin is inserted is provided together with a through hole of the connecting piece.

According to the invention described in claim 5, the returnable case connects the lower end of the short side frame and the long side frame to the corner member of the skid and connects the short side frame and the long side frame. The skid, the short side frame, and the long side frame can be assembled with the connecting truss by engaging the engaging hole with the upper pin of the connecting truss and connecting the short side frame and the long side frame. This eliminates the need for fastening members such as bolts, nuts, and screws, eliminating the loss of fastening members such as nuts, as well as the number of parts, assembly man-hours, disassembly man-hours, assembly and disassembly time, and other parts management man-hours. Can be reduced. Also, when disassembling and assembling, the skid, short side frame, and long side frame can be easily disassembled and assembled by attaching and detaching the upper and lower pins of the connecting truss, improving workability while ensuring rigidity. Can be made.
In addition, the connecting truss is assembled to the truss structure at the connecting portion of the pair of short side frames and the long side frame, each having a lower end portion connected to the skid and an upper end portion erected in the peripheral portion 4 direction of the skid. Therefore, the skit, the short side frame, and the long side frame are firmly fixed to prevent the short side and the long side frame from falling, and the returnable case can be held in a box shape.

  According to the returnable case of claim 1 of the present invention, the length in the long side direction when assembled and disassembled can be varied by the expansion and contraction member so as to be adapted to various kinds of luggage. Can do. As a result, the returnable case can be changed, for example, from 8 modules to 10 modules, etc., reducing logistics costs and widely using a single returnable case worldwide. Since it can be used, it is easy to manage, such as storage and reuse. In addition, when assembled, it contributes to mass transportation by assembling a large returnable case, and when disassembled, it can be efficiently stacked in a narrow space by folding the returnable case short. It becomes possible to improve the efficiency of transportation.

  According to the returnable case of claim 2 of the present invention, the assembled short side and long side frames can be prevented from falling apart due to an external force or the like by the reinforcing arm.

  According to the returnable case of claim 3 of the present invention, the expansion / contraction member expands / contracts in the long side direction, and is positioned and held at a predetermined length that meets the module standard by the lock mechanism. Since displacement can be prevented, the shock resistance against vibration and external force during transportation can be improved, and the case state can be maintained in a desired state.

  According to the returnable case of claim 4 of the present invention, the skid, the short side frame, and the long side frame are connected by the connecting truss, so that it can be assembled with one touch and the workability at the time of assembly and disassembly is improved. Can be made.

  According to the returnable case of claim 5 of the present invention, the lower pin of the connecting truss is engaged with the through hole of the skid and the long side frame, and the upper pin of the connecting truss is connected to the connecting hole of the short side frame and the long side frame, and By engaging with the engaging holes, the skid, the short side frame, and the long side frame can be assembled. This eliminates the need for fastening members such as bolts and nuts, thereby reducing the number of components, assembly man-hours, assembly and disassembly time, and component management man-hours.

Next, with reference to FIGS. 1-12, the best form (henceforth "embodiment") for implementing the returnable case of this invention is demonstrated.
FIG. 1 is an exploded perspective view of a returnable case according to an embodiment of the present invention. FIG. 2 is a perspective view of the returnable case according to the embodiment of the present invention.
In the returnable case 1, the front, rear, left and right directions are arbitrary, and change depending on which direction is the front and the reference, and may be appropriately changed. In the following description, for the sake of convenience, the returnable case 1 will be described with the short-side frames 3 and 3 side being the front-rear side and the long-side frames 5 and 5 being the left side.

≪Returnable case≫
As shown in FIG. 1 and FIG. 2, the returnable case 1 is loaded with, for example, a domestically manufactured part (knock-down part) or a finished product used for assembling overseas and transported by ship. It is a case made of metal such as steel. For example, in motorcycles, knock-down parts of automobiles and finished motorcycles, returnable cases 1 of 4 to 10 modules are used worldwide including Japan. The returnable case 1 includes a skid 2 that forms a rectangular bottom frame, short side frames 3 and 3 that are detachably provided on the front and rear ends of the skid 2, and front and rear sides of the short side frames 3 and 3 ( Long side frames 5 and 5 which are long in the long side direction and are erected on the left and right ends of the skid 2, a connecting truss 4 which connects the skid 2, the short side and the long side frames 3 and 5, It is configured to be connected to a reinforcing arm 6 having a variable length so as to be assembled and disassembled. The returnable case 1 is assembled by arranging stretchable members S that can be stretched in the front-rear (long-side) direction on the skid 2 and the left and right short-side frames 3, 3 that are arranged in the front-rear direction.
Thereby, the returnable case 1 is disassembled into the skid 2, the short side frames 3, 3, the long side frames 5, 5, the connecting truss 4, and the reinforcing arm 6, as shown in FIG. It is configured to be able to.
For example, in the case of the returnable case 1 of 8 modules, the length is A (1492 mm) in the front-rear (long side) direction when the elastic member S is extended as shown in FIG. The length is B (1170 mm) in the front-rear (long side) direction (see FIG. 3B).
The returnable case 1 is used, for example, when it is transported, enlarged as shown in FIG. 2 according to the size of the luggage, or contracted by shrinking the expansion / contraction member S and stored in a container for ships. To be carried. On the other hand, when the package is transported and returned, it is disassembled as shown in FIG. 1, stacked in a folded manner (see FIG. 12), and stored in a ship container.
Hereafter, each part and each part are demonstrated using each figure, referring FIG.

≪Expandable member≫
As shown in FIG. 1, the elastic member S is a member whose length is changed by sliding, and is a member extending in the long side direction of the returnable case 1, that is, the skid 2 and the long side frames 5, 5. And the reinforcing arm 6 respectively. The stretchable members S include stretchable members S1 and S1 and a middle stretchable member S2 respectively installed on the left and right sides of the skid 2, and stretchable members S3 respectively installed on the top and bottom sides of the long side frames 5 and 5 on the left and right sides. , And a reinforcing elastic member S4 installed on the reinforcing arm 6, and these are collectively referred to as an elastic member S.
As will be described later, each of the elastic members S includes front and rear outer frame members 6b, 22e, 22f (see FIG. 2A), 51a, 52a (see FIG. 8) extending in the long side direction, The outer frame members 6b, 22e, 22f, 51a, and 52a are slidably inserted into the inner frame members 6a, 21b, 21c, and 55, and the outer frame members 6b, 22e, 22f, 51a, and 52a are connected to the inner frame. Locking mechanisms L (see FIG. 5) and L ′ (see FIG. 7 (a)) for locking the members 6a, 21b, 21c and 55 at positions of a predetermined length are provided.

  3A and 3B are views showing a skid of the returnable case according to the embodiment of the present invention, in which FIG. 3A is an exploded perspective view and FIG. 3B is a perspective view showing a state when contracted.

≪Skid≫
As shown to Fig.3 (a), the skid 2 is comprised from the middle side skid 21 and the front-and-back side skids 22 and 22 of the same shape arrange | positioned facing the front-and-rear side, and it decomposes | disassembles into three members. Can do. The skid 2 is assembled into a state (see FIG. 1) extended by the right, left and middle expansion members S1 and S2 and a state in which the skid 2 is contracted (see FIG. It is the bottom member which can hold | maintain now.
As shown in FIG. 3B, the skid 2 in which the middle skid 21 and the front and rear skids 22, 22 are assembled is a substantially rectangular bottom frame in plan view, and is directed toward the front and rear (long side) direction. The right, left, and middle expansion / contraction members S1 and S2 that are arranged in parallel with each other and slide in the front / rear (long side) direction to change the length, and the right, left, and middle expansion / contraction that form the long side of the skid 2 Short sides 21a and 22a to 22d arranged in parallel to each other in the left and right (short side) directions orthogonal to the members S1 and S2 are arranged in a substantially lattice shape. In the skid 2, the right, left, and middle expansion members S1, S2 serve as legs installed at the bottom of the returnable case 1, and the forklift claws between the left and right expansion members S1, S1. An intermediate expansion / contraction member S2 is disposed at an interval where the is inserted.
In addition, a corner member 24, connecting pieces 23 and 23, stoppers 25 and 25, an insertion connecting member 26, and a locking piece 27, which will be described later, are provided on the skid 2 by welding means.

<Medium skid>
As shown in FIG. 3A, the middle skid 21 is movably interposed between the front and rear skids 22 and 22, and the length of the skid 2 in the front and rear direction is set to lengths A and B (see FIG. 2). It is a member arranged so that it can expand and contract. The middle skid 21 has one short side 21a extending in the left-right direction, and an inner frame member 21b extending in the front-rear direction perpendicular to the left and right ends of the short side 21a. 21b and an inner frame member 21c extending in the front-rear direction perpendicular to the center of the short side 21a are fixed by welding means.

The short side 21a is formed of a rectangular steel hollow square material as viewed from the left and right, and is fixed to the upper surfaces of the inner frame members 21b and 21c.
The inner frame members 21b and 21c are made of square steel hollow square members when viewed from the front and rear directions, and the front and rear sides are inserted into the outer frame members 22e and 22f, respectively, so as to freely advance and retract. A lock for fitting a cylindrical body L2 of a lock mechanism L (see FIGS. 5A to 5C) that locks the front and rear skids 22 and 22 to a stretched position on the left and right inner frame members 21b and 21b. Two holes 21d and 21d are formed, respectively.

<Front and rear skids>
As shown in FIG. 3 (a), the front and rear skids 22, 22 disposed in front of and behind the middle skid 21 are arranged with the same shape facing each other, and can move forward and backward with respect to the middle skid 21. Is installed. The front and rear skids 22 and 22 each have four short sides 22a to 22d extending in the left-right direction, and extend in the front-rear direction perpendicular to the left and right ends and the center of the short sides 22a to 22d. The provided outer frame members 22e, 22e, and 22f are arranged in a substantially lattice shape, and are fixed by welding means.

The short sides 22a to 22d are made of rectangular steel hollow squares as viewed from the left and right, and are fixed to the upper surfaces of the outer frame members 22e, 22e, and 22f. The short sides 22a to 22d are not limited to four, but are appropriately increased according to the size of the luggage loaded on the skid 2, and the intervals between the short sides 22a to 22d are appropriately reduced. Also good.
The short side 22a is long and sturdy in the width direction as compared with the other short sides 22b to 22d in the skid 2, and is arranged with the thickness direction sideways. Corner members 24 are fixed to the outside and inside of both ends of the short side 22a by welding means, and the insertion connecting member 26 is fixed to the outside and inside of the central portion of the short side 22a by welding means. ing.
The short sides 22b to 22d are respectively installed in parallel at the front and rear end portions and the central portion on the outer frame members 22e, 22e, and 22f arranged in parallel with each other in the thickness direction.
Locking pieces 27 and 27 each made of an L-shaped metal plate member are fixed to the upper surfaces of both end portions of the short side 22c on the center side by welding means.
Connecting pieces 23 and 23 are fixed to the upper surfaces of both end portions of the short side 22d on the side of the middle skid 21 by welding means.

FIG. 4 is a view showing the returnable case according to the embodiment of the present invention, and is an enlarged perspective view of a main part showing the attachment state of the connecting piece and the lock mechanism.
As shown in FIG. 3 (a), the outer frame members 22e, 22e, and 22f are made of a substantially C-shaped steel square as viewed from the front in the front-rear direction. Fitted. The left and right outer frame members 22e, 22e are formed with a notch groove 22g through which the lock member L1 is inserted in the front-rear direction at the center of the upper surface (see FIG. 4).
The left and right outer frame members 22e and 22e have stoppers that hold the lock mechanism L with the connecting pieces 23 and the locking pieces 27 installed on the short sides 22c and 22d when the front and rear skids 22 and 22 are extended. 25 and 25 are fixed by welding means.

<Skid connection piece>
Each connection piece 23 shown to Fig.3 (a) is a member for attaching the connection truss 4 to the skid 2 so that attachment or detachment is possible, and is shape | molded by the substantially L-shaped metal board | plate material (refer FIG. 11). For example, the connecting piece 23 is disposed at both ends of the front and rear skids 22 and 22 on the inner skid 21 side. An L-shaped locking portion 22h (see FIGS. 5A to 5C) is formed on the stopper 25 side of the lower end portion of the connecting piece 23 so as to come into contact with one end surface of the short side 22d. It is fixed to the side 22d by welding means or the like. A through hole 23a with which the lower pin 4a of the connecting truss 4 is engaged is formed in the upper end portion of the connecting piece 23 (see FIG. 11).
The connecting piece 23 is provided on the outer frame members 22e and 22e via the short side 22d, but may be provided directly on the outer frame members 22e and 22e by welding means or the like.

  FIGS. 5A and 5B are views showing a lock mechanism of the returnable case according to the embodiment of the present invention. FIG. 5A is an enlarged perspective view of a main part showing a lock state of the lock mechanism, and FIG. The principal part expansion perspective view which shows the state when it is carrying out, (c) is a principal part expanded sectional view which shows the lock state of a locking mechanism.

<Skid locking mechanism>
As shown in FIGS. 5A to 5C, the locking mechanism L is configured so that the front and rear skids 22 are positioned relative to the middle skid 21 at a position where the skid 2 (see FIG. 3) is 8 modules or 10 modules long. This is a mechanism for making it locked or slidable in a locked state or a released state. As shown in FIG. 5 (c), the lock mechanism L includes a lock member L1 made of an L-shaped round bar member, and a cylinder inserted into the lock hole 21d of the inner frame member 21b with the lock member L1 inserted. The body L2, the coil spring L3 for urging the lock member L1 downward to move it from the released state to the locked state, the stopper 25 and the connecting piece 23 for preventing the lock member L1 from moving in the horizontal direction. The locking portion 22h.
The locking mechanism L includes a stopper 25, a locking portion 22h, a locking piece for engaging the locking member L1 when the distance between the front and rear skids 22, 22 is shortened or moved to an appropriate position. 27 and the short sides 22c, 22h may be further added to increase the lockable positions as appropriate (see FIG. 4). Further, since the lock mechanism L performs the lock function without the coil spring L3, the coil spring L3 may be omitted.

As shown in FIG. 5A, the lock mechanism L is, for example, when the skid 2 has 8 modules (see FIG. 1), the lock member L1 is located between the locking portion 22h of the connecting piece 23 and the stopper 25. And the front and rear skids 22 and 22 at the front and rear are locked in a separated state (see FIG. 4). On the other hand, when the skid 2 has 10 modules (see FIG. 3B), the lock mechanism L is engaged between the locking piece 27 and the stopper 25, with the lock member L1 fixed to the short side 22c. Thus, the front and rear skids 22 and 22 are locked in a state where they are close to each other (see FIG. 4).
Note that the locking portion 22h installed on the side surface of the locking member L1 on the stopper 25 side may be omitted if the short side 22d has the short side 22d and prevents the locking member L1 from moving.

As shown in FIG. 5 (c), the lock member L1 has an L-shaped lower half inserted into the cylindrical body L2 so as to be vertically movable and rotatable, and the lower end of the lock member L1. The part is provided with a spring receiver via a coil spring L3.
The cylindrical body L2 is a stepped cylindrical member having different inner diameters, and a lock member L1 and a coil spring L3 are movably inserted into the cylindrical body L2. The cylindrical body L2 is fitted into a lock hole 21d formed in the inner frame member 21b, and is inserted through the cutout groove 22g of the outer frame member 22e so as to be linearly movable (see FIGS. 5A and 5B). ).
The coil spring L3 is a compression coil spring that urges the spring receiver of the lock member L1, and is a member that always urges the lock member L1 downward to bring it into a locked state. The upper end of the coil spring L3 is always in pressure contact with the stepped portion in the cylindrical body L2, and the lower end is always in pressure contact with the spring receiver.
As shown in FIGS. 5 (a) and 5 (b), the stopper 25 and the locking portion 22h have the locking member L1 projecting from the skid 2 by sandwiching the locking member L1 from both sides so that the locking member L1 is horizontal. It is a member for preventing movement in the direction. When the lock member L1 is pulled up, the lock member L1 can be raised by the length that the spring receiver compresses the coil spring L3.

<Skid corner parts>
FIG. 6 is an enlarged exploded perspective view showing a main part of a corner member of the returnable case according to the embodiment of the present invention.
As shown in FIG. 6, the corner member 24 is a member that detachably connects the short side and the long side frames 3 and 5, which are erected on the skid 2, and the lower ends adjacent to each other in the front and rear and left and right directions. It consists of two types of large and small L-shaped plate members 24a and 24b installed at the left and right ends of the side skid 22, respectively.

As shown in FIG. 6, the large L-shaped plate member 24a is formed on the outer sides of the lower end portions on both sides of the short side frame 3 installed on the short side 22a and on both sides of the long side frame 5 installed on the short side 22b. It is a member which supports the outer side of a lower end part. The L-shaped plate member 24a is fixed to the outside of both end portions of the short side 22a by welding means.
The small L-shaped plate member 24b is a member that supports the insides of the lower end portions on both sides of the long side frame 5 installed at both upper end portions of the short side 22b. The L-shaped plate member 24a is fixed by welding means from the inside of the large L-shaped plate member 24a to the inner position from the end of the short side 22a by the approximate thickness of the long side frame 5.

<Skid plug connection member>
As shown in FIG. 6, the insertion connecting member 26 is formed by paralleling two plate members installed on the front side and the rear side of the central portion of the short side 22 a at an interval of approximately the thickness of the short side frame 3. Standing up. The insertion connecting member 26 is a member that prevents the short side frame 3 from moving in the front-rear direction by inserting the lower side frame member 3a of the short side frame 3 between the two plates.

≪Short side frame≫
As shown in FIG. 1, the short side frames 3 and 3 are members that respectively constitute the front surface portion and the rear surface portion of the returnable case 1 when assembled, and are installed at the front end portion and the rear end portion of the skid 2. It consists of a pair of symmetrically shaped members that are detachably connected to the short sides 22a, 23a. The short side frame 3 includes a lower side frame member 3a, an upper side frame member 3b, corner columns 3c and 3c, columns 3d, trusses 3e and 3e, connecting members 31 and 31, and connecting portion reinforcing plates 32 and 32. It is composed of The lower frame member 3a, the upper frame member 3b, the corner columns 3c, 3c, the columns 3d, and the trusses 3e, 3e constituting the skeleton of the short frame 3 are made of a rectangular steel square tube material in cross section.

<Lower frame member of short frame>
The lower frame member 3a constitutes the lower frame member of the frame-like body of the short frame 3, and is fixed to both ends by welding means in a state where the corner columns 3c are upright. At the center of the lower frame member 3a, a support column 3d and a connecting portion reinforcing plate 32 supporting the support column 3d are fixed upright by welding means.

<Upper side frame member of short side frame>
As shown in FIG. 1, the upper frame member 3b constitutes the upper frame member of the short frame 3, and is arranged in parallel to the lower frame member 3a, and is an expandable member S3 on the upper side of the long frame 5 described later. Is installed at the same height. Corner struts 3c, 3c and connecting members 31, 31 are fixed to both ends of the upper frame member 3b by welding means. A column 3d is fixed to the lower side of the central portion of the upper frame member 3b by welding means, and a reinforcing arm 6 that is slidable and variable in length is detachably connected to the upper side of the column 3d.

<Corner post, strut, truss of short side frame>
The corner columns 3c and 3c are members constituting the left and right side frame members of the short side frame 3, and are installed vertically.
The column 3d is a columnar reinforcing member installed at the center between the lower frame member 3a and the upper frame member 3b.
The trusses 3e and 3e are reinforcing members of the short side frame 3, and are arranged obliquely with the upper end welded to the connecting member 31 and the lower end welded to the connecting portion reinforcing plate 32.

<Short-side frame connecting member>
As shown in FIG. 1, when assembling the returnable case 1, the connecting members 31, 31 are connected to the upper end portions of the front and rear short side frames 3 and the upper end portions of the left and right long side frames 5. This is a letter-shaped metal plate member. The short side frame 3 side of the connecting member 31 is fixed to the connecting portion between the upper side frame member 3b and the corner columns 3c, 3c by welding means, and the long side frame 5 side is from the short side frame 3 to the long side frame 5 side. And a connecting hole 31a through which the upper pin 4b (see FIG. 11) of the connecting truss 4 is inserted.
The connecting member 31 is connected to a connecting hole 31a and connecting holes 54a and 54a drilled in a connecting portion reinforcing plate 54 of the long side frame 5 described later on the upper side of the connecting truss 4 connected to the connecting piece 23 of the skid 2. The pin 4 b (see FIG. 11) is a member for connecting the short side frame 3 and the long side frame 5 to each other and fixing to the skid 2 via the connection truss 4 by being inserted.

<Connector reinforcing plate for short side frame>
As shown in FIG. 1, the connecting portion reinforcing plates 32 and 32 support the column 3d at a right angle to the lower frame member 3a and fix the ends of the left and right trusses 3e and 3e, respectively. It is a member for reinforcing. This connection part reinforcement board 32 consists of a triangular metal plate member, and is being fixed to the location where the lower side frame member 3a, the support | pillar 3d, and truss 3e, 3e are connected by the welding means.

  FIG. 7 is a view showing a reinforcing arm of a returnable case according to an embodiment of the present invention, (a) is an enlarged perspective view having a partial cross section, (b) is an enlarged plan view of a main part showing a locking mechanism, (C) is a principal part expanded sectional view which shows a locking mechanism.

≪Reinforcement arm≫
As shown in FIG. 7A, the reinforcing arm 6 has both ends connected to the upper side frame members 3b, 3b of the pair of short side frames 3, 3 on the front side and the rear side, and the short side frames 3, 3 are connected. It is a reinforcing member for maintaining firmly standing in parallel with each other, and is provided with an elastic member S4 that slides and has a variable length like the skid 2 and the long side frame 5 (see FIG. 1). . The reinforcing arm 6 includes an inner frame member 6a, an outer frame member 6b, engagement plates 6c and 6c installed at both ends of the inner and outer frame members 6a and 6b, a lock mechanism L ', and a locking mechanism 6e. It consists of and.

As shown in FIG. 7 (a), the inner frame member 6a is formed of a cylindrical member that is inserted into the outer frame member 6b so as to expand and contract, and the front end portion is inserted into the outer frame member 6b. The rear end portion is fixed to the engagement plate 6c by welding means.
The outer frame member 6b is formed of a rectangular tube-like member into which the inner frame member 6a is telescopically and rotatably inserted, and the front end portion is fixed to the engagement plate 6c by welding means, and the inner end is fixed to the rear end portion. A frame member 6a and a lock mechanism L ′ are installed.
The engagement plates 6c and 6c are substantially hook-shaped plate members for connecting the inner and outer frame members 6a and 6b and the upper frame members 3b and 3b of the short side frames 3 and 3 disposed in the front and rear. The engagement plate 6c includes a plate portion 6f on which the inner and outer frame members 6a and 6b and the locking mechanism 6e are mounted, and a hook portion 6g having a U-shape when viewed from the side, which is engaged with the upper frame member 3b. Are integrally formed.
In addition, the reinforcement arm 6 may arrange | position either the inner frame member 6a or the outer frame member 6b in the front side.

<Retaining mechanism for reinforcing arm>
As shown in FIG. 7B, the locking mechanism 6e has a locking pin 6h made of an L-shaped round bar whose tip engages with a hook portion 6g and a lock hole 6d drilled in the upper frame member 3b. And a cylindrical body 6i into which the locking pin 6h and the coil spring 6j are inserted, and a coil spring 6i that urges the locking pin 6h in the locking direction.

<Reinforcement arm locking mechanism>
As shown in FIG. 7C, the lock mechanism L ′ includes a pin-shaped lock member L1 ′ mounted on the distal end side of the inner frame member 6a and the lock member L1 ′ at a predetermined angle in the rotation direction. The lock groove L2 ′ is formed so as to be rotatable.
As shown in FIG. 7A, the lock mechanism L ′ is configured such that when the plate portion 6f is horizontal and the engagement plate 6c can be locked to the upper frame member 3b, the lock member L1 ′ is horizontal. When the direction is engaged with the lock groove L2 ′ and the inner frame member 6a is rotated so that the plate portion 6f is inclined, the lock member L1 ′ is moved as shown by the phantom line in FIG. The lock arm is released from the lock groove L2 ′, the locked state is released, and the reinforcing arm 6 can be expanded and contracted.

  FIG. 8 is a side view showing the returnable case according to the embodiment of the present invention. FIG. 9 is a side view showing the long side frame of the returnable case according to the embodiment of the present invention.

≪Long side frame≫
As shown in FIGS. 8 and 9, the long side frames 5 and 5 are a pair of frame-like members that constitute the left and right side surfaces of the returnable case 1, and are slid in the front-rear (long side) direction to vary in length. It has elastic members S3 and S3. The long side frame 5 has a frame-like front long side frame 51 and a rear long side having inner frame members 55 and 55 slidably inserted into upper and lower outer frame members 51 a and 51 a of the front long side frame 51. It is comprised from the frame 52 and the connection part reinforcement plates 53 and 54 (refer FIG. 1).

<Front long side frame>
As shown in FIG. 9, the front long side frame 51 includes outer frame members 51a and 51a disposed on the upper and lower sides, corner posts 51c disposed on the front end portion of the outer frame member 51a, and outer frame members 51a. A support column 51b disposed at the rear end portion is provided in a frame shape and fixed by welding means. The front long side frame 51 has a connecting portion reinforcing plate 53 fixed to the inside of a connecting portion between the lower outer frame member 51a and the column 51b by welding means, and a connecting portion between the upper outer frame member 51a and the corner column 51c. The connecting portion reinforcing plates 54 and 54 are fixed to the inside by welding means.

<Rear side frame>
The rear long side frame 52 is a frame that is assembled so as to expand and contract with respect to the front long side frame 51, and has a shape in which an inner frame member 55 is added to the front long side frame 51 described above. That is, the rear long side frame 52 includes an inner frame member 55 that is inserted into the outer frame member 51a in a stretchable manner, horizontal frame members 52a and 52a that are respectively fitted to the upper and lower inner frame members 55 and 55, and a horizontal frame member 52a and 52a. A column 52b disposed at the front end of the frame members 52a and 52a and a corner column 52c disposed at the rear end of the horizontal frame members 52a and 52a are provided in a frame shape and fixed by welding means. In the rear long side frame 52, a connecting portion reinforcing plate 53 is fixed to the inner side of a connecting portion between the lower horizontal frame member 52a and the column 52b by welding means, and the upper horizontal frame member 52a and the corner column 52c are connected to each other. The connecting portion reinforcing plate 54 is fixed to the inside of the place by welding means.
The front and rear long side frames 51 and 52 have been described separately for the sake of convenience, but the front side and the rear side frames 51 and 52 may be arranged on either side, and the inner frame member 55 is fixed on either side. May be.

  FIGS. 10A and 10B are views showing an engagement state of the inner frame member and the outer frame member in the returnable case according to the embodiment of the present invention, wherein FIG. 10A is an enlarged perspective view of a main part, and FIG. It is.

<Inner frame member and outer frame member of long side frame>
As shown in FIGS. 10A and 10B, the inner frame member 55 and the outer frame member 51a of the long side frame 5 are members that constitute the elastic member S (S3). The inner frame member 55 has a front side slidably disposed inside the outer frame member 51a, and a rear side fitted and fixed inside the horizontal frame member 52a (see FIG. 9). The inner frame member 55 is formed of a convex portion 55a formed at the center portion and flange portions 55b formed on both sides of the convex portion 55a.
As shown in FIG. 10A, the outer frame member 51a is formed on both sides of the sliding contact portion 51e with which the flange portion 55b slides, and holds the flange portion 55b slidably. The holding part 51d is formed.

<Horizontal frame member of rear long side frame>
9 are formed in the same shape as the outer frame member 51a, and appropriate portions are fixed to the inner frame member 55 by welding means. Therefore, the rear long side frame 52 is assembled so as to expand and contract with respect to the front long side frame 51.

  FIG. 11 is an enlarged perspective view having a partial cross section showing the connecting truss in the returnable case according to the embodiment of the present invention.

<Connector reinforcement plate>
As shown in FIG. 11, the connecting portion reinforcing plates 53 and 54 are reinforcing members for maintaining the shapes of the front and rear long side frames 51 and 52 formed of a rectangular frame, and are formed by a triangular or quadrangular plate material. Is formed. The connection portion reinforcing plate 53 is provided with a connection hole 53a through which the lower pin 4a of the connection truss 4 through the through hole 23a of the connection piece 23 is inserted. The connection hole 53a is a hole formed to connect the connection portion reinforcing plate 53 of the long side frame 5 and the connection piece 23 of the skid 2 by the lower pin 4a.
The connecting portion reinforcing plate 54 has a connecting hole 54a through which the head 4j of the upper pin 4b of the connecting truss 4 is inserted, and a locking member that is connected to the lower side of the connecting hole 54a and engages the column portion 4k. A notch groove 54b is formed. The connection hole 54 a is a hole formed to connect the connection portion reinforcing plate 54 of the long side frame 5 and the connection member 31 of the short side frame 3 by the upper pin 4 b. The locking notch groove 54b is a hole in which the support column 4k is engaged in order to maintain the connected state.

≪Connected truss≫
As shown in FIG. 11, the connecting truss 4 is assembled by connecting the skid 2, the long side frame 5, and the short side frame 3, and serves as a member for maintaining the box state of the returnable case 1. It also serves as a reinforcing member for the front and rear long frames 51 and 52 (see FIG. 1). The connecting truss 4 includes a rectangular tube-shaped main body frame member 4c, plate members 4d and 4e installed on both sides of the main body frame member 4c, a lower pin 4a installed on the lower plate member 4d, and an upper plate member. It is comprised from the upper side pin 4b installed in 4e.

<Lower pin of connecting truss>
The lower pin 4a includes, for example, a substantially columnar column portion 4g having a base end fixed to the plate member 4d and having a notch groove 4f, and a plate-like lock portion 4h that is rotatably supported in the notch groove 4f. And a support shaft 4i that pivotally supports the lock portion 4h. The lower pin 4a is inserted into the through hole 23a of the connecting piece 23 and the connecting hole 53a of the connecting portion reinforcing plate 53, with the locking portion 4h straight with respect to the supporting column 4g. By rotating the lock portion 4h at a right angle, the connecting truss 4 is attached to the skid 2 and the long side frame 5, and the skid 2 and the long side frame 5 are connected (see FIG. 1).

<Upper pin of connecting truss>
As shown in FIG. 11, the upper pin 4b is formed by integrally forming a hemispherical head 4j and a support column 4k having a base end portion fixed to a plate member 4e and having a head portion 4j at a distal end portion. The upper pin 4b is inserted by inserting the head portion 4j into the connection hole 31a of the connection member 31 and the connection hole 54a of the connection portion reinforcing plate 54, and engaging the column portion 4k with the locking notch grooves 31b and 53b. The short side frame 3 and the long side frame 5 are locked in a connected state.

≪Action≫
Next, the operation of the returnable case according to the embodiment of the present invention will be described in the order of assembly, mainly with reference to FIG.

  As shown in FIG. 1, the returnable case 1 can be stored in a state where each member is disassembled and folded. When assembling these members and assembling the 8-module returnable case 1, first, the lock members L1 installed on the skid 2 are pulled up to release the lock mechanism L to the state shown in FIG. 5 (b). To do. When the lock member L1 is hooked on the connecting piece 23 or the short side 22d, the unlocked state of the lock mechanism L is maintained, and the front and rear skids 22 can slide with respect to the middle skid 21. (See FIG. 3).

  Next, the front and rear skids 22 of the skid 2 in a state of being contracted to 10 modules shown in FIG. 3B are pulled out to the front side and the rear side to form the skid 2 having the size of 8 modules shown in FIG. In this state, the locking member L1 is rotated to be in the locked state shown in FIGS. 5A and 5C, and the skid 2 is held in an 8-module state.

Subsequently, as shown in FIG. 6, the rear short side frame 3 is erected and inserted into the insertion connecting member 26, and both ends of the short side frame 3 are interposed between the L-shaped plate members 24 a and 24 a. insert.
Next, the left and right long-side frames 5 and 5 are extended to a length of 8 modules (see FIG. 9), and the L-shaped plate member 24a of the skid 2 and the L-shape are formed in a state where both ends of the long-side frame 5 are raised. Each is inserted between the plate members 24b. Then, the returnable case 1 is assembled in a U shape in plan view.

  Next, as shown in FIG. 11, the upper pin 4 b of the connection truss 4 is inserted into the connection hole 31 a of the connection member 31 installed in the short side frame 3, and the connection part reinforcement installed in the long side frame 5 is further inserted. The column 4k is inserted into the connecting hole 54a of the plate 54, and the support column 4k is engaged with the locking cutout grooves 31b and 54b. Thus, the front and rear short side frames 3 and 3 are fixed to the left long side frame 5 by the upper pin 4 b of the connecting truss 4.

  Subsequently, the lower pin 4 a of the connecting truss 4 is inserted into the through hole 23 a of the connecting piece 23 installed in the skid 2, and further inserted into the connecting hole 53 a of the connecting portion reinforcing plate 53 installed in the long side frame 5. Then, the lock portion 4h is bent at a right angle. Thus, the left long frame 5 is fixed to the skid 2 by the lower pin 4a of the connecting truss 4, and the returnable case 1 is firmly assembled in a U shape in plan view. In this state, loads are loaded from the front side of the returnable case 1.

  After loading the luggage into the returnable case 1, the remaining short side frame 3 on the front side is then raised and inserted into the insertion connecting member 26, and both ends of the short side frame 3 are L-shaped. It inserts between board | plate materials 24a and 24a. Then, the returnable case 1 is assembled in a square shape in plan view.

  Next, as shown in FIG. 11, the upper pin 4 b of the connecting truss 4 is inserted into the connecting hole 31 a of the connecting member 31 and the connecting hole 54 a of the connecting portion reinforcing plate 54 installed in the short side frame 3 as described above. Then, the support column 4k is engaged with the locking cutout grooves 31b and 54b.

  Subsequently, the lower pin 4 a of the connecting truss 4 is inserted into the through hole 23 a of the connecting piece 23 installed on the right side of the skid 2, and further, the connecting hole 53 a of the connecting portion reinforcing plate 53 installed on the long side frame 5. Then, the lock portion 4 h is bent at a right angle, and the right long frame 5 is fixed to the skid 2 by the connecting truss 4.

  Further, as shown in FIG. 7, the reinforcing arm 6 is extended to a size of 8 modules and the state is held by the lock mechanism L ′. The engagement plates 6c and 6d of the reinforcing arm 6 are engaged with the upper frame members 3b and 3b of the front and rear short frames 3 and 3, and the engagement state is maintained by the locking mechanism 6e. Accordingly, the front and rear short side frames 3 and 3 are held in a state of being erected in parallel with each other. Thereby, the assembly of the returnable case 1 is completed. The returnable case 1 is transported in a ship container, for example.

As described above, the connecting truss 4 firmly holds the skid 2, the short side frame 3, and the long side frame 5 in the assembled state of the returnable case 1 as shown in FIGS. For this reason, the returnable case 1 can fix each frame without fastening members such as bolts, nuts and screws. Therefore, the returnable case 1 can reduce the number of parts such as fastening members, the number of parts management, the number of assembling processes, the assembling time, and the distribution cost.
The returnable case 1 is assembled in a state of 8 modules as shown in FIG.

  As shown in FIG. 2, the returnable case 1 is disposed in the front-rear direction by releasing the lock mechanisms L (see FIGS. 3 to 5) and L ′ (see FIGS. 7A and 7C). By contracting each stretchable member S, the length C can be shortened to change to a 10-module returnable case 1 having a length B in the front-rear direction. In this way, the returnable case 1 can be expanded and contracted by changing the length in the front and rear (long side) direction from the length A to the length B, so that it can be sized according to the size of the luggage to be transported, The usable range of the returnable case 1 can be expanded to improve the utilization.

When disassembling this returnable case 1 and stacking it for storage or transportation,
As shown in FIG. 1, the reinforcing arm 6 connected between the upper side frame members 3 b and 3 b of the short side frames 3 and 3 is removed, and then each connecting truss 4 is removed from the long side frame 5.
When removing the connecting truss 4, as shown in FIG. 11, first, the lock portion 4h of the lower pin 4a is set up vertically with respect to the plate material 4d, and the connecting piece 23 and the connecting portion reinforcing plate 53 are placed on the lower side. The pin 4a is removed so that the skid 2 and the long side frame 5 can be separated.

  Next, the support 4k of the upper pin 4b is moved from the coupling member 31 and the locking cutout grooves 31b and 54b of the coupling reinforcing plate 54 to the coupling holes 31a and 54a, and the upper pin 4b is removed from the coupling holes 31a and 54a. The short side frame 3 and the long side frame 5 can be separated. In addition, the short side and long side frames 3 and 5 can be separated from the skid 2 simply by pulling upward.

FIGS. 12A and 12B are views showing a state when the returnable case according to the embodiment of the present invention is disassembled and folded, where FIG. 12A is an exploded perspective view and FIG. 12B is a perspective view.
Subsequently, as shown in FIG. 12A, the respective elastic members S provided on the separated skid 2, long side frame 5 and reinforcing arm 6 are contracted to a length of 10 modules. Then, the long side frame 5 is placed inside the corner member 24 on the skid 2, and the connecting truss 4 is placed on the left and right of the skid 2. Further, by stacking the short side frame 3 and the reinforcing arm 6 so as to overlap each other, as shown in FIG. 12B, all the members are stacked lower than the height of the corner member 24, and the skid 2 Can be accommodated in the corner member 24.

  In this way, by stacking the returnable case 1 in a container (not shown), it is possible to transport and store a large number of returnable cases 1 in a narrow transport space. The returnable case 1 can make an empty pace in a container (not shown) by reducing the occupied area from 8 modules to 10 modules. Since the empty space of the container can be loaded and transported with other loads, it is possible to improve the efficiency of space and transportation. Further, even when another returnable case is folded in the same manner on the returnable case 1, the four corners of the outer peripheral portion are supported by the L-shaped corner member 24, the connecting member 31, and the short side 22a. Since the left and right outer peripheral portions are supported by the connecting piece 23, each member is prevented from moving to the outside of the skid 2, so that the stacked members are not collapsed.

As shown in FIG. 12A, the four connecting trusses 4 are placed inside the connecting piece 23 on the skid 2 in the front-rear direction, and the long side frame 5 or the short side frame 3 from above. Pile up with pressing. By doing so, the connecting truss 4 being transported is prevented from falling off from the left and right direction of the skid 2 by the connecting piece 23, the connecting member 31, and the short side 22 a, and the connecting truss 4 is prevented from dropping from the front and rear direction. The short side 22a is blocked by the short side 22b to 21d, 21a and the long side frame 5 or the short side frame 3 placed on the short side 22a. There is nothing.
The reinforcing arm 6 can be attached to the skid 2 so as not to drop off by locking the locking plate 6c and the locking mechanism L ′ to the short side 22a of the front and rear end portions.

  The present invention is not limited to the above-described embodiment, and various modifications and changes can be made within the scope of the technical idea, and the present invention extends to these modifications and changes. Of course.

For example, as shown in FIG. 1, the stretchable member S has been described in the returnable case 1 provided on the skid 2, the long side frame 5 and the reinforcing arm 6 having members arranged in the front and rear (long side) direction. However, the returnable case 1 may be expanded and contracted in the short side direction by providing the skid 2 having the members arranged in the left and right (short side) direction and the short side frame 3 with the elastic member S. .
Further, the elastic member S may be configured such that the returnable case 1 can be expanded and contracted in the vertical direction on the short side and long side frames 3 and 5 having members arranged in the vertical direction.
In addition, the length that can be expanded and contracted by the expansion / contraction member S is set to the length C so that it can be changed from 10 modules to the lengths A and B in the 8 modules (see FIG. 2). However, the length may be set appropriately according to the package to be transported.

  The upper and lower pins 4a and 4b of the connecting truss 4, the through holes 23a, the connecting holes 31a, 53a and 54a, and the locking cutout grooves 31b and 54b with which the upper and lower pins 4a and 4b are engaged, The shape is not limited to the shape shown in FIG. 11, and the upper and lower ends of the connecting truss 4 are detachably connected to the connecting piece 23, the connecting portion reinforcing plates 53 and 54, and the connecting member 31. That's fine.

It is a disassembled perspective view of the returnable case which concerns on embodiment of this invention. It is a perspective view of the returnable case which concerns on embodiment of this invention. It is a figure which shows the skid of the returnable case which concerns on embodiment of this invention, (a) is a disassembled perspective view, (b) is a perspective view which shows a state when it shrinks. It is a figure which shows the returnable case which concerns on embodiment of this invention, and is a principal part expansion perspective view which shows the attachment state of a connection piece and a lock mechanism. FIGS. 5A and 5B are views showing a lock mechanism of the returnable case according to the embodiment of the present invention. FIG. 5A is an enlarged perspective view of a main part showing a lock state of the lock mechanism, and FIG. The principal part expansion perspective view which shows the state when it is carrying out, (c) is a principal part expanded sectional view which shows the lock state of a locking mechanism. It is a principal part expansion disassembled perspective view which shows the corner member of the returnable case which concerns on embodiment of this invention. It is drawing which shows the reinforcement arm of the returnable case which concerns on embodiment of this invention, (a) is an expansion perspective view which has a partial cross section, (b) is a principal part enlarged plan view which shows a locking mechanism, (c) is It is a principal part expanded sectional view which shows a locking mechanism. It is a side view which shows the returnable case which concerns on embodiment of this invention. It is a side view which shows the long side frame of the returnable case which concerns on embodiment of this invention. It is a figure which shows the engagement state of the inner frame member and outer frame member in the returnable case which concerns on embodiment of this invention, (a) is a principal part expansion perspective view, (b) is a principal part expansion perspective view. It is an expansion perspective view which has a partial cross section which shows the connection truss in the returnable case which concerns on embodiment of this invention. It is drawing which shows a state when the returnable case which concerns on embodiment of this invention is disassembled and folded, (a) is a disassembled perspective view, (b) is a perspective view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Returnable case 2 Skid 3 Short side frame 3b Upper side frame member 4 Connection truss 4a Lower side pin 4b Upper side pin 5 Long side frame 6 Reinforcement arm 6a, 21b, 21c, 55 Inner frame member 6b, 22e, 22f, 51a, 52a Outside Frame member 21a, 22a-22d Short side 23 Connection piece 23a Through hole 24 Corner member 31 Connection member 31a, 53a, 54a Connection hole 53, 54 Reinforcement plate S, S1-S4 Expandable member (long side)
L, L 'Lock mechanism

Claims (5)

A rectangular skid forming a bottom frame, a pair of short side frames detachably provided on the short side of the skid, and a pair of long side frames detachably provided on the long side of the skid In a returnable case that can be assembled and disassembled,
The returnable case, wherein the skid and the long-side frame have an elastic member that slides in the long-side direction and has a variable length. The pair of short side frames are arranged in parallel to each other and formed into a quadrangle by arranging the upper side frame member on the upper side,
The returnable case according to claim 1, wherein the upper frame member is supported by a reinforcing arm that slides and has a variable length. The elastic member includes an outer frame member extending in the long side direction and an inner frame member slidably inserted into the outer frame member.
The returnable case according to claim 1, further comprising a lock mechanism that locks the outer frame member and the inner frame member. The pair of short side frames and the pair of long side frames are assembled on the skid so as to be rectangular in plan view, and upper ends adjacent to each other are detachably connected with a connecting truss,
The returnable case according to any one of claims 1 to 3, wherein the connecting truss has a lower end portion detachably connected to the skid. The skid has a corner member that detachably connects the lower edge portions of the short-side frame and the long-side frame, and a through hole into which a lower pin installed at the lower end portion of the connecting truss is inserted. Provided with a drilled connecting piece,
The upper end of the short side frame is provided with a connecting member having a connecting hole that engages with an upper pin installed on the upper end of the connecting truss,
The long side frame is provided with a connecting portion reinforcing plate having a connecting hole for inserting the upper pin together with the connecting hole of the short side frame, and the lower side together with the through hole of the connecting piece. 5. The returnable case according to claim 4, further comprising a connecting portion reinforcing plate having a connecting hole into which a pin is inserted.

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