JP7515525B2 - Pillar and beam connection structure - Google Patents

Description

The present invention relates to a connecting structure between posts and beams, for example, a connecting structure that interconnects the posts of a rack and the beams of a load-receiving shelf when adding a load-receiving shelf between multiple racks.

Racks known as nesting racks have been used in warehouses and other locations to store items while they are still loaded on pallets. Conventionally, when using this type of rack, for example, multiple racks are arranged side by side at a predetermined interval, and additional cargo receiving shelves are installed between the multiple racks (Patent Document 1).

When adding a load-receiving shelf between multiple racks, for example, a beam (beam material) that spans the multiple racks is connected to the support of the rack, and shelf members and the like are installed on the beam. Conventionally, the connection structures described in Patent Documents 2 and 3 are known as connection structures between the support and beam of a rack.

9 is a diagram showing a conventional connection structure described in Patent Document 2. As shown in FIG. 9(A), in this connection structure, an L-shaped mounting bracket 103 is provided at the end of the beam 102, and the mounting bracket 103 is joined to the front surface 101a and side surface 101b of the support 101 to connect the beam 102 to the support 101. At this time, a plurality of locking holes 104 are provided at a predetermined interval in the vertical direction on the front surface 101a of the support 101. Meanwhile, the L-shaped mounting bracket 103 has a fixing plate portion 103a that is joined to the front surface 101a of the support 101, and a base portion 103b that is provided by bending one end of the fixing plate portion 103a at a right angle and is joined to the side surface 101b of the support 101. The fixing plate portion 103a is provided with a locking claw 105 that engages with the locking hole 104. The end of the beam 102 is fixed to the base portion 103b by welding or the like. As a result, the mounting bracket 103 is structured so that the end of the beam 102 can be detachably connected and fixed to the side surface 101b of the support 101, as shown in FIG. 9(B).

Here, in the conventional connection structure, a pair of locking holes 104, 104 are provided side by side at the same height position on the front surface 101a of the support 101, and the locking claw 105 of the mounting bracket 103 is fitted and locked into one of the left and right locking holes 104. Figure 9 (B) illustrates a state in which the locking claw 105 of the mounting bracket 103 is locked into the right locking hole 104 of the locking holes 104, 104 provided side by side on the left and right. Therefore, when connecting another beam at the same height position from the direction facing the beam 102, it is possible to fit and lock the locking claw of the mounting bracket having a shape symmetrical to the mounting bracket 103 shown in Figure 9 into the left locking hole 104, and thus two beams extending in the left and right directions from the same height position of the support 101 can be connected to the support 101.

JP 2002-284161 A Japanese Patent Application Laid-Open No. 7-8336 JP 2000-289816 A

However, when the beam 102 is attached to the support 101 using the L-shaped mounting bracket 103 as in the conventional connection structure described above, there is a problem that the connection strength of the beam 102 to the support 101 is insufficient. That is, in the case of the conventional L-shaped mounting bracket 103, the fixing plate portion 103a is joined to the front surface 101a of the support 101 and the locking claw 105 is fitted and locked into the locking hole 104. However, as shown in FIG. 9C, when the beam 102 is subjected to a load F in a cantilevered state, a downward moment acts on the upper end of the base plate portion 103b in a direction away from the side surface 101b of the support 101, and the fixing plate portion 103a and the locking claw 105 may be deformed or may escape from the locking hole 104 due to the distortion of the base plate portion 103b.

In order to increase the beam connection strength, for example, it is possible to modify the L-shaped mounting bracket into a U-shape and provide a pair of side plates on both the left and right sides of the fixed plate portion 103a, which is provided with a locking claw, that embrace both the left and right sides of the support 101. In this case, however, although it is possible to connect one beam to the support at a specified height, a problem arises in that it is not possible to connect another beam to the same height from the opposite direction to this beam.

The present invention was made to solve the above problems, and aims to provide a connection structure that improves the connection strength of the beam to the pillar compared to the conventional method, and further enables multiple beams to be connected from opposite directions at the same height position of the pillar.

In order to achieve the above object, the present invention adopts a connecting structure for connecting a beam (6, 9) to a support (3) having a rectangular cross section with a front surface (3F), a rear surface (3B) and both side surfaces (3L, 3R), and the support (3) has at least one of the front surface (3F) and the rear surface (3B) as a connecting surface, and locking holes (31) are provided in a row at a predetermined interval in the vertical direction on the connecting surface, and the beam (6, 9) is fixed with mounting brackets (21, 22) having locking claws (38) that are fitted and locked into the locking holes (31), and the front The mounting bracket is provided with a fixed plate portion (23) that is joined to the connecting surface by providing the locking claws, and a base portion (25) that is bent from one of the two side edges of the fixed plate portion and joined to one of the left and right side surfaces of the support, and in the configuration in which the beam is fixed to the base portion, a holding plate portion (24) is provided that is bent from the other of the two side edges of the fixed plate portion (23) and joined to the other of the two side surfaces of the support, and the holding plate portion and the base portion are configured to hold both sides of the support.

Also preferably, the support (3) has locking holes (31) arranged in a row at a predetermined interval in the vertical direction on each of the front surface (3F) and the rear surface (3B), and the first mounting bracket (22) fixed to the first beam (9) and the second mounting bracket (21) fixed to the second beam (6) are fixed to the rear surface (3B) and the front surface (3F), respectively. The first mounting bracket (22) of the first beam (9) joins and fixes the fixing plate portion (23) to the rear surface (3R), joins the base plate portion (25) to the right side surface (3R) of the left and right sides of the support (3), and joins the holding plate portion (24) to the left side surface (3L). The second mounting bracket (21) of the second beam (6) joins the fixing plate portion (23) to the front surface (3B). The first mounting bracket (22) and the second mounting bracket (21) are configured to be joined and fixed to the front surface (3F), the base plate portion (25) is joined to the left side surface (3L) of the left and right sides of the support (3), and the holding plate portion (24) is joined to the right side surface (3R). The first mounting bracket (22) and the second mounting bracket (21) are configured so that the base plate portion (25) of one mounting bracket and the holding plate portion (24) of the other mounting bracket face each other on the left and right sides (3L, 3R) of the support, and the base plate portion (25) has a base portion (26) that is joined to the side surface of the support, and a tip portion (27) that extends from the base portion and holds the holding plate portion (24) in a housed state by forming a gap between the base portion and the side surface of the support.

According to the present invention, the mounting brackets (21, 22) are provided with a fixing plate portion (23) joined to the front surface (3F) or rear surface (3B) of the support (3), a base plate portion (25) bent from one of the two side edges of the fixing plate portion (23) and joined to one of the left and right side surfaces (3L, 3R) of the support (3), and a holding plate portion (24) bent from the other of the two side edges of the fixing plate portion (23) and joined to the other of the two side surfaces (3L, 3R) of the support (3). Since the base plate portion (25) and the holding plate portion (24) are configured to hold both sides of the support (3), it is possible to connect multiple beams to the support (3) from opposite directions at the same height position of the support (3), while improving the connection strength of the beam to the support (3) more than before.

1 is a perspective view showing an example of a linked rack in which a load-receiving shelf is added between multiple racks. FIG. 13 is a diagram illustrating a structure of a support pillar. 11 is a perspective view showing a structure for connecting a first beam and a second beam to a support of a rack. FIG. 11 is a plan view showing a structure for connecting a first beam and a second beam to a support of a rack. FIG. A plan view showing the state in which the mounting bracket for the second beam is attached to the front side of the support. 13 is a plan view showing a state in which a first beam and a second beam are connected at the same height position of the support. FIG. 11 is a perspective view showing a state in which a first beam and a second beam are connected at the same height position of the support. FIG. 11 is a perspective view showing an example of a structure for connecting a first beam and a second beam to a rear support column of the rack. FIG. FIG. 1 is a diagram showing a conventional connection structure.

Below, preferred embodiments of the present invention will be described in detail with reference to the drawings. Note that in the drawings referred to below, the same reference numerals are used to designate common members, and redundant descriptions of those members will be omitted.

(An example of a connected rack)
1 shows an example of the configuration of a connected rack 1 that embodies the connection structure of the present invention. Note that the connection structure of the present invention is not limited to racks, but can be implemented broadly as a structure for connecting posts and beams, and it should be understood that the connected rack described below is just one example.

As shown in the figure, the linked rack 1 is made up of multiple racks 1a and 1b, also known as nesting racks, that are installed at a predetermined interval in the left-right direction, with additional load-receiving shelves 8 provided between the multiple racks 1a and 1b, and the multiple racks 1a and 1b are interconnected by the load-receiving shelves 8.

Racks 1a and 1b are configured so that items (luggage) can be stored while still loaded on pallets, for example in a warehouse. Racks 1a and 1b are configured as nesting racks, for example, and when not in use, racks 1a and 1b can be nested (stacked) inside one rack 1a, reducing the space occupied by the racks when not in use, by removing the additional cargo receiving shelf 8 and the cargo receiving shelves 4, 4 described below.

Racks 1a and 1b each have the same configuration. That is, racks 1a and 1b each have a rectangular base 2 installed on the floor surface, four pillars 3 supported by the base 2 in an upright position in the vertical direction, and cargo receiving shelves 4, 4 installed at two height positions of the four pillars 3. The four pillars 3 supported by the base 2 are composed of a pair of front pillars 3a, 3b fixed at a predetermined distance apart in the left-right direction on the front side of the base 2, and a pair of rear pillars 3c, 3d fixed at a predetermined distance apart in the left-right direction on the rear side of the base 2.

The base 2 is a base made of, for example, metal square pipes assembled into a rectangular shape by welding, and the planar size of the rectangle is large enough to carry, for example, a pallet. Therefore, the base 2 can hold a pallet with items (luggage) loaded on its upper surface. Also, as described above, the base 2 supports the front columns 3a, 3b and the rear columns 3c, 3d in a vertically erected state. A space is formed below the base 2 into which the forks of a forklift or the like can be inserted. Therefore, the racks 1a, 1b can be moved by lifting the base 2 with a forklift or the like.

The front columns 3a, 3b have a larger gap in the left-right direction than the left-right dimension of the rear end of the base section 2. In other words, a gap large enough to accommodate the rear end of the base section 2 of another rack is ensured between the pair of front columns 3a, 3b. On the other hand, the gap in the left-right direction between the rear columns 3c, 3d is narrower than the gap between the front columns 3a, 3b, and is fixed, for example, to the rear side of the base section 2. Therefore, when nesting multiple racks 1a, 1b when not in use, it is possible to insert the rear end of another rack 1b in a nested manner between the pair of front columns 3a, 3b of one rack 1a.

The cargo receiving shelves 4, 4 are removable shelves that can be attached to any height position of the four pillars 3. FIG. 1 shows an example in which the cargo receiving shelves 4, 4 are provided at two height positions, at the top and center of the four pillars 3 of each rack 1a, 1b. The cargo receiving shelves 4, 4 provided on each rack 1a, 1b are at the same height position. However, the attachment position of the cargo receiving shelves 4 is not limited to this, and the number of cargo receiving shelves 4 installed is not limited to two. For example, the cargo receiving shelves 4 may be installed at only one position, at the top or center of the four pillars 3. Also, three or more cargo receiving shelves 4 may be installed at different height positions.

The cargo receiving shelf 4 is equipped with connecting members 6, 6 that form a beam and cargo receiving members 7, 7, and is capable of loading items (luggage) above the base portion 2. By installing the cargo receiving shelf 4 on the support posts 3 of the racks 1a, 1b, the racks 1a, 1b can be configured with multiple levels.

The connecting members 6, 6 connect the left front support 3a and the rear support 3c of each rack 1a, 1b, and connect the right front support 3b and the rear support 3d of each rack 1a, 1b. That is, the connecting members 6, 6 are arranged in the front-to-rear direction on both the left and right sides of each rack 1a, 1b in a parallel state with a predetermined distance between them, with the front ends connected to the front supports 3a, 3b and the rear ends connected to the rear supports 3c, 3d. The front and rear ends of the connecting members 6, 6 are provided with mounting brackets 21 for fixing to the front supports 3a, 3b and the rear supports 3c, 3d. The mounting brackets 21 are fixed to the front and rear ends of the connecting members 6, 6 by welding or the like.

The cargo receiving members 7, 7 are hung horizontally on the left and right connecting members 6, 6 to form the cargo receiving shelf 4 on which goods (luggage) can be placed. For example, at both ends of the cargo receiving members 7, 7, downward notched recesses corresponding to the width of the upper surface of the connecting members 6, 6 are formed, and the cargo receiving members 7, 7 are installed on the connecting members 6, 6 by placing and engaging the recesses over the upper surfaces of the connecting members 6, 6.

The additional cargo receiving shelf 8 is installed on multiple racks 1a, 1b installed at a specified interval, and is configured to allow items (luggage) to be placed on it. Figure 1 shows an example in which it is installed at the same two height positions as the cargo receiving shelves 4, 4 between the multiple racks 1a, 1b. This cargo receiving shelf 8 is equipped with a pair of beams 9, 9 that are installed horizontally across the multiple racks 1a, 1b and extend in the left-right direction, and cargo receiving members 10, 10 that are installed on the pair of beams 9, 9 and extend in the front-rear direction.

The beam 9 arranged on the front side of the pair of beams 9, 9 extends in the left-right direction between the front supports 3b, 3a of the adjacent racks 1a, 1b, and both ends are connected and fixed to the front supports 3b, 3a, respectively. The beam 9 arranged on the rear side of the pair of beams 9, 9 extends in the left-right direction between the rear supports 3d, 3c of the adjacent racks 1a, 1b, and both ends are connected and fixed to the rear supports 3d, 3c, respectively.

The cargo receiving members 10, 10 are mounted on the front and rear beams 9, 9, and constitute an additional cargo receiving shelf 8 on which items (luggage) can be placed. For example, at both ends of the cargo receiving members 10, 10, downward notched recesses corresponding to the width of the upper surface of the beams 9, 9 are formed, and the cargo receiving members 10, 10 are installed on the beams 9, 9 by covering and engaging the recesses with the upper surfaces of the beams 9, 9.

In this case, the additional receiving shelves 8, 8 are installed at the same height as the receiving shelves 4, 4 installed on each rack 1a, 1b, so the mounting brackets 22 of the beams 9, 9 are attached to the support pillars 3 at the same height as the mounting brackets 21 of the connecting members 6, 6. To make this possible, an embodiment of the connecting structure according to the present invention is configured between the support pillars 3 and the mounting brackets 21, 22 as described below.

(Connected structure)
FIG. 2 illustrates the structure of the support 3. The support 3 is formed of a metal square pipe, and in the illustrated example, the horizontal cross section is rectangular. The support 3 has four faces, a front face 3F, a rear face 3B, a right side face 3R, and a left side face 3L. The support 3 has a large number of locking holes 31 and holes 33 formed in the vertical direction on both the front face 3F and the rear face 3B. For example, a pair of locking holes 31, 31 are arranged in parallel in the horizontal direction on the front face 3F and the rear face 3B of the support 3, and a large number of pairs of locking holes 31, 31 are formed at a predetermined interval along the longitudinal direction (vertical direction) of the support 3. The pair of locking holes 31, 31 arranged in parallel on the left and right have a symmetrical shape and have a shape that narrows from the top to the bottom. The locking hole 31 is located on the inside and has a locking piece 32 that engages with the locking claw 38 of the inserted mounting bracket 21, 22. Furthermore, a hole 33 for inserting a pin 40, which will be described later, is provided between the two locking holes 31 lined up vertically. Here, the pair of locking holes 31, 31 formed on the front side of the support 3 are formed at the same height as the pair of locking holes 31, 31 formed on the rear side. This allows the mounting brackets 21, 22 to be attached to the front and rear sides of the support 3 at the same height positions, respectively.

Figures 3 to 7 show a connection structure for connecting a beam 9 (hereinafter referred to as the "first beam 9") and a connecting member 6 (hereinafter referred to as the "second beam 6") to the front support 3b (hereinafter referred to simply as the "support 3") of the rack 1a.

In the illustrated embodiment, the second beam 6 has an arm crosspiece 12 extending in the fore-and-aft direction, and a beam connection part 13 facing the support pillar 3 is fixed to the front end of the arm crosspiece 12. The arm crosspiece 12 and the beam connection part 13 are made of a metal square pipe, just like the support pillar 3, and the beam connection part 13 is fixed to the side of the arm crosspiece 12 at the front end of the arm crosspiece 12 by welding or the like, and a mounting bracket 21 is fixed to the tip of the arm crosspiece 12 by welding or the like.

On the other hand, the first beam 9, like the support 3, is also made of a metal square pipe, and a mounting bracket 22 is fixed to the end facing the support 3 by welding or the like.

The mounting brackets 21, 22 of the first beam 9 and the second beam 6 have a common structure. That is, the mounting brackets 21, 22 are each composed of a substantially U-shaped bracket having a fixing plate portion 23 that is joined to the front surface 3F and rear surface 3B of the support 3, a base portion 25 that is bent from one of the left and right side edges of the fixing plate portion 23 and joined to one of the left and right side surfaces 3L, 3R of the support 3, and a retaining plate portion 24 that is bent from the other of the left and right side edges of the fixing plate portion 23 and joined to the other of the left and right side surfaces 3L, 3R of the support 3.

When the fixing plate 23 is joined to the front surface 3F or rear surface 3B of the support 3 (in the illustrated example, the fixing plate 23 of the mounting bracket 21 is on the front surface 3F, and the fixing plate 23 of the mounting bracket 22 is on the rear surface 3B), the four locking claws 38 formed on the top, bottom, left and right are engaged with the locking pieces 32 while being fitted into the locking holes 31 of the support 3, thereby fixing the mounting brackets 21, 22 to the support 3. The locking claws 38, 38 and the locking holes 31, 31 arranged side by side on the left and right each have a symmetrical shape.

Specifically, the locking claws 38 protrude inward from the fixed plate portion 23, and are inserted into the locking holes 31 and pushed downward to engage with the locking pieces 32. The distance between the locking claws 38 provided on the upper part of the fixed plate portion 23 and the locking claws 38 provided on the lower part matches the vertical distance between the locking holes 31, 31 formed in the support 3. Therefore, the fixed plate portion 23 can have the four locking claws 38 engage with the locking pieces 32 of the four locking holes 31 simultaneously.

The fixing plate 23 also has holes 39 formed between the two upper locking claws 38 and the two lower locking claws 38, through which a pin 40 can be inserted. When the four locking claws 38 engage with the locking pieces 32 of the support 3, the holes 39 match the positions of the holes 33 provided in the support 3 and communicate with each other. By inserting the pin 40 through the holes 39, the fixing plate 23 is prevented from moving in the vertical direction.

When the fixing plate 23 is joined to the front surface 3F or rear surface 3B of the support 3 by fitting the locking claw 38 into the locking hole 31 and engaging with the locking piece 32, the base plate 25 and the holding plate 24 are joined to the left and right side surfaces 3L, 3R of the support 3. As a result, the mounting brackets 21, 22 hold the front surface 3F or rear surface 3B of the support 3 with the fixing plate 23, and hold the left and right side surfaces 3L, 3R of the support 3 with the base plate 25 and the holding plate 24 that extend parallel to each other in a perpendicular direction from both left and right side edges of the fixing plate 23. In other words, the mounting brackets 21, 22 hold the three surfaces of the front surface 3F or rear surface 3B and the left and right side surfaces 3L, 3R of the support 3 in a state where they are embraced, and are fixed in an inseparably manner by the engagement of the locking claw 38 and the locking piece 32.

In the case of the conventional L-shaped mounting bracket described above with reference to Figure 9, the fixed plate portion 103a is joined to the front surface 101a of the support 101 and the locking claw 105 is fitted and locked into the locking hole 104. However, for example, when the beam is subjected to a load F in a cantilevered state, a downward moment acts on the lower end of the base portion 103b as a fulcrum, causing the locking claw 105 to deform or come out of the locking hole 104. In contrast, in the connection structure of this embodiment, the mounting brackets 21, 22 are formed in a substantially U-shape with a fixing plate portion 23, a base plate portion 25, and a retaining plate portion 24. Even if a force acts on the base plate portion 25 from the end of the beams 6, 9 (the second beam 6 is the connection portion 13) in a direction that moves the upper end portion away from the support 3, the retaining plate portion 24, which is joined to the side of the support 3 on the opposite side to the base plate portion 25, receives and supports the force, thereby preventing the locking claw 38 from deforming or coming off the locking hole 31. In other words, the connection structure of this embodiment employs a structure in which the mounting brackets 21, 22 are formed in a U-shape and the fixing plate portion 23 embraces the left and right sides 3L, 3R of the support 3 on both the left and right sides, thereby dispersing stress and improving the connection strength.

As shown in FIG. 4, the first beam 9 and the beam connection portion 13 of the second beam 6 connected to the base plate portion 25 have a width dimension approximately equal to the width dimension L1 in the fore-aft direction of the support 3, so the length L3 in the fore-aft direction of the base plate portion 25 of each of the mounting brackets 21 and 22 is formed to be approximately equal to the width dimension L1 in the fore-aft direction of the support 3. This allows the base plate portion 25 to be fixed over a wide area so as to cover the entire end faces of the beam connection portions 13 of the first beam 9 and the second beam 6.

The substrate 25 has a base 26, a tip 27, and a step 28 along the front-rear direction. The base 26 is provided on the base end side connected to the fixed plate 23, and is joined to the side of the support 3. The step 28 is provided at an intermediate position between the base 26 and the tip 27, forming a step between the base 26 and the tip 27. The tip 27 is connected to the base 26 via the step 28, and is extended at a position outside the base 26. As a result, when the fixed plate 23 is attached to the front 3F or rear 3B of the support 3, the substrate 25 joins the base 26 to the side of the support 3, and separates the tip 27 from the side of the support 3 by a predetermined distance D to form a gap 35 (see FIG. 5) between the side of the support 3 and the tip 27. The distance D of this gap 35 is formed to be approximately equal to the plate thickness T of the holding plate 24.

On the other hand, the holding plate 24 is formed such that the length L2 in the front-rear direction is shorter than the length L4 in the front-rear direction of the tip 27 of the base plate 25, and is joined to the side of the support 3 when the fixing plate 23 is attached to the front surface 3F or rear surface 3B of the support 3. Therefore, the mounting brackets 21 and 22 can be arranged on both the left and right side surfaces 3L and 3R of the support 3 with the tip 27 of the base plate 25 of one mounting bracket and the holding plate 24 of the other mounting bracket facing each other. Specifically, as shown in FIG. 6, the holding plate 24 of the mounting brackets 21 and 22 is arranged in a state of being accommodated in the gap formed between the tip 27 of the base plate 25 of the mounting brackets 22 and 21 arranged on the opposite side of the support 3 and the side of the support 3, and the tip 27 of the base plate 25 of one mounting bracket and the holding plate 24 of the other mounting bracket can be installed in a state of being overlapped.

As shown in FIG. 7, the connecting structure constructed as described above allows the mounting bracket 21 provided on the second beam 6 and the mounting bracket 22 provided on the first beam 9 to be attached to both the front and rear sides of the support 3 at the same height. In particular, the retaining plate 24 of the mounting brackets 21, 22 penetrates into the inside of the tip 27 of the base plate 25, and the inner surface of the tip 27 of the base plate 25 holds the retaining plate 24. Therefore, the two beams, the first beam 9 and the second beam 6, are attached in a state where the mounting brackets 21, 22 are mutually held, which can further increase the connecting strength.

In addition, after the mounting brackets 21, 22 are attached to the support 3, by attaching a pin 40 to the hole 39 as shown in FIG. 7, it is possible to prevent the engagement between the locking claws 38 of the mounting brackets 21, 22 and the locking pieces 32 of the locking holes 31 formed in the support 3 from being released. In other words, the pin 40 is provided as a means for preventing the locking claws 38 from coming off the locking pieces 32. It is preferable that the pins 40 as a means for preventing the locking claws 38 from coming off the locking pieces 32 are attached individually to each of the mounting brackets 21, 22.

In the above, an example was given of a structure in which the second beam 6 and the first beam 9 constituting the additional load-receiving shelf 8 are connected to the support 3b of rack 1a at the same height. In contrast, a structure in which the second beam 6 and the first beam 9 constituting the additional load-receiving shelf 8 are connected to the support 3a of rack 1b at the same height is realized as a structure in which the above-mentioned structure is flipped left and right.

Next, FIG. 8 is a perspective view showing an example of a structure for connecting the second beam 6 and the first beam 9 to the rear support 3c of the rack 1b. The second beam 6 of the rack 1b has a beam connection part 14 at the rear end of the arm rail 12 that extends in the front-to-rear direction. The beam connection part 14 is made of a metal square pipe, similar to the support 3. The beam connection part 14 is fixed to the side of the arm rail 12 at the rear end of the arm rail 12 by welding or the like, and extends toward the rear support 3c of the rack 1b. A mounting bracket 21 is fixed to the tip of the beam connection part 14 by welding or the like.

Because the beam connection part 14 faces the front surface of the support 3, the tip of the beam connection part 14 is fixed to the fixed plate part 23 of the mounting bracket 21. In other words, the fixing point is changed from the above embodiment in which the beam or its connection part is fixed to the base part of the mounting bracket 21. In this case, it is preferable that the beam connection part 14 is fixed in a state in which only one hole 39 of the two holes 39, 39 provided in the fixed plate part 23 of the mounting bracket 21 is closed and the other hole 39 is opened. This allows the pin 40 to be attached to the other hole 39 after the mounting bracket 21 is attached to the front surface of the support 3, as shown in FIG. 8.

On the other hand, the end of the first beam 9 of the additional cargo receiving shelf 8 is fixed by welding or the like to a mounting bracket 22 similar to the above embodiment. At this time, the end of the first beam 9 is fixed to the base portion 25 of the mounting bracket 22. Then, the fixing plate portion 23 of the mounting bracket 22 is attached to the rear side of the support 3. As a result, the mounting bracket 22 is attached at the same height as the mounting bracket 21, and the first beam 9 can be connected to the support 3 at the same height as the beam connection portion 14.

In FIG. 8, a structure in which the second beam 6 and the first beam 9 constituting the additional cargo receiving shelf 8 are connected to the support 3c of one rack 1b at the same height has been described as an example. In contrast, a structure in which the second beam 6 and the first beam 9 are connected to the support 3d of the other rack 1a at the same height is realized as a structure in which the above-mentioned structure is reversed from left to right.

In this way, the linked rack 1 of this embodiment can install an additional receiving shelf 8 between the racks 1a and 1b with the receiving shelves 4 installed on each of the racks 1a and 1b. The second beam 6 that holds the receiving shelves 4 has mounting brackets 21 at each of its front and rear ends, and is installed at a predetermined height on the support 3 by engaging the locking claws 38 of the fixing plate portion 23 with the front surface 3F of the support 3 of each rack 1a and 1b. The first beam 9 that holds the receiving shelves 8 is arranged to span between the racks 1a and 1b installed at a predetermined interval, has mounting brackets 22 at both ends, and is installed at a predetermined height on the support 3 by engaging the locking claws 38 of the fixing plate portion 23 with the rear surface 3B of the support 3 of each rack 1a and 1b. The mounting brackets 21, 22 attached to the front 3F or rear 3B of the support 3 have a fixing plate portion 23 that is joined to the front 3F or rear 3B of the support 3, and a base plate portion 25 and a holding plate portion 24 that extend from the left and right side edges of the fixing plate portion 23 along the left and right side surfaces 3L, 3R of the support 3. When the locking claws 38 of the fixing plate portion 23 are engaged with the locking holes 31 of the support 3, the base plate portion 25 and the holding plate portion 24 are joined to the left and right side surfaces 3L, 3R of the support 3. Therefore, since the mounting brackets 21, 22 are attached to the support 3 in a state where they embrace the left and right side surfaces 3L, 3R of the support 3, it is possible to connect the first beam 9 to the support 3 more firmly than conventional L-shaped brackets.

In addition, the mounting bracket 22 of the first beam 9 is configured to join and fix the fixed plate portion 23 to the rear surface 3B of the pillar 3, join the base plate portion 25 to the right side surface 3R of the left and right side surfaces 3L, 3R of the pillar 3, and join the retaining plate portion 24 to the left side surface 3L, and the mounting bracket 21 of the second beam 6 is configured to join and fix the fixed plate portion 23 to the front surface 3F of the pillar 3, join the base plate portion 25 to the left side surface 3L of the left and right side surfaces 3L, 3R of the pillar 3, and join the retaining plate portion 24 to the right side surface 3R. The mounting brackets 22 and 21 face each other on the left and right side surfaces 3L and 3R of the support 3, with the base plate 25 of one mounting bracket and the holding plate 24 of the other mounting bracket facing each other, and the base plate 25 has a base 26 that is joined to the side surface of the support 3 and a tip 27 that extends from the base 26 and holds the holding plate 24 in a housed state by forming a gap 35 between the base plate 25 and the side surface of the support 3. Therefore, the mounting brackets 21 and 22 can be joined to the side surface of the support 3 with the base plate 25 and holding plate 24 overlapping each other, so that the first beam 9 and the second beam 6 can be more firmly connected at the same height position of the support 3.

Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiment described above. In other words, the present invention includes various modifications of the embodiments described above.

For example, in the above embodiment, four locking claws 38 are formed on the fixing plate portion 23 of the mounting brackets 21, 22, and the four locking claws 38 engage with four locking holes 31 formed on the front or rear surface of the support 3. However, the number of locking claws 38 provided on the fixing plate portion 23 is not limited to four, and at least one may be sufficient.

REFERENCE SIGNS LIST 1 Connected rack 1a, 1b Rack 2 Base portion 3 (3a, 3b, 3c, 3d) Support 3F Front surface 3B Rear surface 3L Left side surface 3R Right side surface 4 Load receiving shelf 6 Connecting member (second beam)
7 Load receiving member 8 Load receiving shelf 9 Beam (first beam)
REFERENCE SIGNS LIST 10: Load-receiving member 12: Arm crosspiece 13, 14: Beam connection portion 21, 22: Mounting bracket 23: Fixed plate portion 24: Holding plate portion 25: Base plate portion 26: Base portion 27: Tip portion 28: Step portion 31: Locking hole 32: Locking piece 33: Hole 35: Gap 38: Locking claw 39: Hole 40: Pin

Claims (2)

A connecting structure for connecting a beam to a support having a rectangular cross section with a front surface, a rear surface, and both sides,
At least one of the front and rear surfaces of the support (3) is a connecting surface, and locking holes (31) are vertically arranged at predetermined intervals on the connecting surface.
The beams (6, 9) are fixed with mounting brackets (21, 22) each having a locking claw (38) that is fitted into the locking hole and locked thereto.
The mounting bracket is provided with a fixing plate portion (23) which is joined to the connecting surface by providing the locking claws, and a base portion (25) which is bent from one of both side edges of the fixing plate portion and joined to one of both left and right side surfaces of the support, and the beam is fixed to the base portion,
A support and beam connection structure is provided with a retaining plate portion (24) bent from the other of both side edges of the fixing plate portion (23) and joined to the other of both side surfaces of the support, and the retaining plate portion and the base portion are configured to hold both side surfaces of the support. The support (3) has locking holes (31) arranged in a row at a predetermined interval in the vertical direction on each of its front surface (3F) and rear surface (3B), and a first mounting bracket (22) fixed to the first beam (9) and a second mounting bracket (21) fixed to the second beam (6) are fixed to the rear surface (3B) and front surface (3F), respectively.
The first mounting bracket (22) of the first beam (9) joins and fixes the fixing plate portion (23) to the rear surface (3R), joins the base plate portion (25) to the right side surface (3R) of the left and right sides of the support (3), and joins the holding plate portion (24) to the left side surface (3L).
The second mounting bracket (21) of the second beam (6) is configured to join and fix the fixing plate portion (23) to the front surface (3F), join the base plate portion (25) to the left side surface (3L) of the right and left sides of the support (3), and join the holding plate portion (24) to the right side surface (3R).
The first mounting bracket (22) and the second mounting bracket (21) are arranged on both the left and right side surfaces (3L, 3R) of the support, with the base plate portion (25) of one mounting bracket and the retaining plate portion (24) of the other mounting bracket facing each other, and the base plate portion (25) is provided with a base portion (26) that is joined to the side surface of the support, and a tip portion (27) that extends from the base portion and holds the retaining plate portion (24) in a contained state by forming a gap between the base portion and the side surface of the support.

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