Multi-tiered rack unit device

Abstract

To provide a multistage rack unit in which stacked rack units are protected by a belt.SOLUTION: There is provided a multistage rack unit, in which the upper sides of four strut members 3 are connected by an upper frame U, and the lower sides of four strut members 3 are connected by a lower frame D, and thereby a rack unit R is formed. The rack unit R is vertically stacked in a plurality of stages, and thereby the multistage rack unit R is formed. A belt attaching metal fitting K having a headed pin 5 projected on the front surface is fixed to each of the right and left strut members 3 of the front surface side of upper and lower rack units R. A first belt B1 is attached between an upper right headed pin 5 and a lower left headed pin 5, and a second belt B2 is attached between an upper left headed pin 5 and a lower right headed pin 5.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a multi-tiered rack unit device in which a belt is attached to a multi-tiered rack unit. [Background technology]

[0002] As disclosed in Patent Document 1, a multi-tiered rack unit for storing cargo is known as a forward nester or reverse nester, and is configured by connecting one end of four support members to the four corners of a lattice-shaped square frame, and connecting the other end of the four support members with left and right crossbars and a rear crossbar. When stacking rack units vertically, the four support members of the upper rack unit are placed directly above the four support members of the lower rack unit. These two stacks are placed side by side to form a set of four, and the set of four is connected in the middle with a connecting metal fitting to secure the set in place. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6155350 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned prior art, when there are four rack units, they can be connected and fixed in place with a connecting metal fitting in the middle, but when there are only two rack units, the positions of the units are set in a vertical relationship, front to back and left to right, and there is no means of protection against vertical vibrations due to earthquakes, etc., or horizontal bending, etc., and there is no means of preventing cargo from falling off. SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-tiered rack unit device that can solve the problems of the prior art.

[0005] The object of the present invention is to provide a multi-tiered rack unit device that can protect against vertical vibrations, horizontal deflection, falling of cargo, etc. by stacking rack units vertically and stretching two belts in an X-shape. [Means for solving the problem]

[0006] The specific means for solving the problem in the present invention is to form a rack unit R by connecting the upper sides of four support members 3 with an upper frame U and connecting the lower sides of the four support members 3 with a lower frame D, and to stack these rack units R in multiple stages vertically to form a multi-stage rack unit R, Belt mounting brackets K with headed pins 5 protruding from the front are fixed to the left and right support members 3 on the front side of the upper and lower rack units R, The first belt B1 is attached to the upper right headed pin 5 and the lower left headed pin 5, and the second belt B2 is attached to the upper left headed pin 5 and the lower right headed pin 5. [Effects of the Invention]

[0007] According to the present invention, stacked rack units can be protected by a belt. That is, according to the present invention, two belts B are stretched in an X-shape, and the multi-tiered rack unit R can be protected against vertical vibration, horizontal bending, and falling off of cargo. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a first embodiment of a multi-tiered rack unit device of the present invention. [Figure 2] FIG. 1 is a perspective view showing a belt mounting clamp of a first embodiment. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. 2 is a front view of the multi-tiered rack unit device. [Figure 7]FIG. [Figure 8] FIG. [Figure 9] FIG. 10 is a front view showing a second embodiment of the multi-tiered rack unit apparatus of the present invention. [Figure 10] FIG. [Figure 11] 10 is a cross-sectional view taken along line XX in FIG. 9. [Figure 12] FIG. 10 is an exploded cross-sectional view taken along line XX in FIG. 9. [Figure 13] FIG. [Figure 14] FIG. [Figure 15] FIG. 10 is a side view of a belt mounting clamp according to a second embodiment. [Figure 16] FIG. [Figure 17] FIG. [Figure 18] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 8 show a first embodiment of a multi-tiered rack unit device 2 (2A) using a belt mounting bracket K. In FIG. In Figures 1 and 6 to 8, the multi-tier rack unit device 2 (2A) is configured by stacking two inverted nester rack units R one above the other to form a multi-tier rack unit R, and belt mounting brackets K with headed pins 5 protruding from the front are attached to the left and right support members 3 on the front side of the upper and lower rack units R, and the upper right headed pin 5 and the lower left headed pin 5 are connected by a first belt B1, and the upper left headed pin 5 and the lower right headed pin 5 are connected by a second belt B2.

[0010] The rack unit R has a rectangular upper frame U formed by fitting a lattice member into the frame, and one end (upper end) of four support members 3 made of square pipes is connected to the four corners of this upper frame U, and the other ends (lower ends) of the four support members 3 are connected by a lower frame D, which has side crossbars 12 connecting the two front and rear support members 3 on the left and right and a rear crossbar 12 connecting the two left and right support members 3 on the rear side, but there is no crossbar 12 between the two front left and right support members 3, forming a front opening Q. This front opening Q serves as the luggage entrance for the rack unit R.

[0011] 6 and 7, the cargo N is exemplified as a pallet on which goods are placed. The two support members 3 on the left and right at the rear side are located directly below the corners of the upper frame U. The two support members 3 on the left and right at the front side are located outside the corners of the upper frame U, and their upper ends protrude above the upper frame U, with the hollow of the square pipe open and the lower ends of the upper front support members 3 formed to engage within the square pipe.

[0012] A positioning member 17 is provided at the rear of the upper frame U, against which the lower end of the upper rear support member 3 abuts. Furthermore, the rack unit R is provided with support members 18 at the front and rear of the upper surface of each of the left and right side rails 12, which are capable of supporting the left and right side rails 12 of the upper rack unit R when not in use. When not in use, the front support member 3 and upper frame U of the upper rack unit R can be nested relative to the lower rack unit R.

[0013] When rack units R are stacked in two tiers, one above the other, the rear crossbar 12 of the upper rack unit R is placed on the rear of the upper frame U of the lower rack unit R, and an upper / lower connector P is provided to connect the rear of this upper frame U to the rear crossbar 12. The upper / lower connector P has a fitting member 14 that fits into the rear of the upper frame U and the rear crossbar 12, and a fastener 15 such as a bolt that tightens the fitting member 14.

[0014] In Figures 1 to 8, the belt mounting bracket K for connecting the first belt B1 and the second belt B2 to the rack unit R has a fitting member 4 that fits into the support member 3, a headed pin 5 that protrudes from the front of the fitting member 4, and a fastener 6 that penetrates the rear part of the fitting member 4. Since a square pipe is used for the support member 3, the fitting member 4 has left and right side walls 4b formed rearward from both the left and right ends of the front wall 4a, forming a roughly U-shaped member in a plan view. If a round pipe is used for the support member 3, it is preferable to form the front wall 4a of the fitting member 4 in a semicircular or arc shape.

[0015] The rear portions of the left and right side walls 4b of the fitting member 4 protrude rearward beyond the support member 3, and through holes 8 are formed in these rear portions, into which fasteners 6 are inserted from the outside, left and right. The fastener 6 is composed of a pair of threaded members 6a and 6b, and has a male-female thread coupling structure. One of the threaded members 6a has a flange portion a and a hexagonal hole b at its outer end, and a male thread c at its inner end, while the other threaded member 6b has a flange portion a and a hexagonal hole b at its outer end, and a female thread d at its inner end, which is threadedly connected to the male thread c.

[0016] Then, one of the screwing members 6a is inserted into the through hole 8 of one of the side walls 4b so that the flange portion a abuts against the outer surface of the side wall 4b, and the other screwing member 6b is inserted into the through hole 8 of the other side wall 4b so that the flange portion a abuts against the outer surface of the side wall 4b. A hexagonal wrench is engaged in the hexagonal holes b of both screwing members 6a, 6b, and the female and male screws c, d are screwed together. When the male and female screws c, d of the two screw members 6a, 6b are screwed together, the left and right side walls 4b of the fitting member 4 clamp the support member 3, thereby firmly fixing the belt mounting bracket K to the support member 3.

[0017] The fastener 6 is arranged at approximately the same height as the headed pin 5 and is capable of abutting against the back surface of the support member 3. The headed pin 5 is fixed (welded) to the front surface of the fitting member 4 at approximately the center in the vertical and horizontal directions, and can hook the terminal fittings F provided on both ends of the belts B1 and B2, and the hooked terminal fittings F can be prevented from coming off by their heads 5a.

[0018] The first belt B1 and the second belt B2 are two belts connected with a buckle so that the length can be adjusted freely, and are belts for securing cargo, with terminal fittings F at the ends of each belt. The terminal fittings F at both ends may be of an open hook type, but the embodiment illustrates a safety hook type. To assemble the multi-tier rack unit device 2A, with the two rack units R placed on the ground, the engaging members 4 of the belt mounting bracket K are fitted into the left and right support members 3 on the front side, and a fastener 6 is inserted into the rear of the bracket to secure the belt mounting bracket K to the support member 3 so that the headed pin 5 protrudes from the front side of the support member 3.

[0019] The terminal fittings F at the upper ends of the first belt B1 and the second belt B2 are connected to the left and right belt mounting fittings K of the upper rack unit R, and in this state the upper rack unit R is placed on the lower rack unit R, and the rear crossbeam 12 of the upper rack unit is connected to the rear of the upper frame U of the lower rack unit with the upper and lower connecting fittings P. Then, the terminal fitting F at the lower end of the first belt B1 connected to the upper right headed pin 5 is connected to the lower left headed pin 5, and the terminal fitting F at the lower end of the second belt B2 connected to the upper left headed pin 5 is connected to the lower right headed pin 5, and the first belt B1 and the second belt B2 are installed in an X-shape.

[0020] By stretching the two belts B1 and B2 in an X-shape, the vertical vibrations and horizontal bending of the multi-tiered rack unit R can be flexibly absorbed, protecting the multi-tiered rack unit R from damage, falling off, etc., and also preventing cargo N from falling off from the cargo entrance (front opening Q) at the front of the rack unit R. The belt mounting bracket K and the two belts B1, B2 can also be arranged on the rear side and / or the left and right side sides of the multi-tier rack unit R. Furthermore, if the multi-tier rack unit R has three or more tiers, the belt mounting bracket K and the two belts B1, B2 can be arranged in a relationship between the upper tier and the middle tier, a relationship between the middle tier and the lower tier, or a relationship between the upper tier and the lower tier excluding the middle tier.

[0021] 9 to 18 show a second embodiment of a multi-tiered rack unit device 2 (2B) protected by a belt. In Figures 9 to 14, the multi-tier rack unit device 2 (2B) comprises a rack unit R made up of four support members 3, an upper frame U connecting the upper sides of the four support members 3, and a lower frame D connecting the lower sides of the four support members 3, and these rack units R are stacked one on top of the other to form a multi-tier rack unit R, and belt mounting brackets K with headed pins 5 protruding from the front are fixed to the left and right support members 3 on the front side of the upper and lower rack units R, and a first belt B1 is attached to the upper right headed pin 5 and the lower left headed pin 5, and a second belt B2 is attached to the upper left headed pin 5 and the lower right headed pin 5.

[0022] The support member 3 of the multi-tiered rack unit device 2B is formed of a square pipe like the support member 3 of the first embodiment, but a number of engagement recesses 21 are formed in the vertical direction on the front wall 3a thereof, The left and right side walls 3b are formed with through holes 22. The distance between the front left and right support members 3 is set wider than the distance between the rear left and right support members 3. Each support member 3 is provided at its lower end with a valley-shaped grounding fixture 31, and at its upper end with a mountain-shaped top fixture 32 that can fit into the grounding fixture 31. The grounding fixture 31 and top fixture 32 are made of synthetic resin, rubber, or the like.

[0023] The upper frame U and the lower frame D have substantially the same structure, and are configured into a rectangular frame shape by connecting a pair of front and rear members 35 having a symmetrical shape with a front member 36 and a rear member 37. The front-rear member 35 is formed of a square pipe similar to the support member 3, and has a plurality of engagement recesses 21 formed in the upper walls of the front and rear portions thereof, and through holes 22 formed in the left and right side walls thereof. The front-rear member 35 has arm portions 35a at its front end that protrude outward to the left and right, and left and right front fitting members 24 with a U-shaped cross section are fixed to the tips of these arm portions 35a.

[0024] The fitting members 24 can be fitted into the left and right front support members 3, the front wall 24a is provided with tongues 26 that are inserted into the engagement recesses 21 of the support members 3, the left and right side walls are formed with through holes that face the through holes 22 of the support members 3, and fasteners 6 are passed through the through holes 22 of both to fasten them together. The fasteners 6 have a male and female screw connection structure similar to that of the first embodiment. The fitting member 24 can select the engagement recess 21 of the support member 3 into which the tongue piece 26 is inserted, and the installation height of the upper frame U and lower frame D can be changed by changing the spacing of the engagement recesses 21 of the support member 3.

[0025] The rear member 37 is provided at both left and right ends with mounting members 41 that are U-shaped in cross section and long in the front-to-rear direction, and left and right rear fitting members 24 that are U-shaped in cross section and long in the up-down direction and located inside each mounting member 41. The left and right rear fitting members 24 have tongues 26 and through holes, similar to the front fitting members 24, and are fitted to the left and right rear support members 3. It is fitted from the front, and fasteners 6 are passed through the through holes and through holes 22 in the side wall 3b and fastened.

[0026] The mounting member 41, which is long in the front-to-rear direction, is made of the same material as each of the fitting members 24, and its U-shaped opening faces downward. It fits into the rear of the front-to-rear member 35 from above, with the tongue of the mounting member 41 inserted into the engagement recess 21 of the front-to-rear member 35, and is fastened by passing a fastener 6 through the through hole 22 between the front-to-rear member 35 and the mounting member 41. The first belt B1 and the second belt B2 of the multi-tiered rack unit device 2B of the second embodiment are the same as those of the first embodiment, but as shown in Figures 15 and 16, the belt mounting bracket K has a shorter front-to-rear dimension of the engaging member 4 to which the headed pin 5 protruding from the front is fixed, and the fastener 6 simultaneously penetrates the through holes 8 in the left and right side walls 4b of the engaging member 4 and the through holes 22 in the side walls 3b of the support member 3.

[0027] When rack units R are stacked in two tiers, the lower end of the support member 3 of the upper rack unit R is placed on the support member 3 of the lower rack unit R. Upper and lower connectors P are provided between the upper part of the lower support member 3 on the left and right rear sides and the lower part of the upper support member 3 to connect them together. 11, 12, 17 and 18, the upper and lower connecting device P has a support shaft 45 provided on the upper part of the lower support member 3 and having a spacer 44 fitted into a fastener having a male and female thread connection structure, a hook member 46 whose base is pivoted on the support shaft 45, a lock piece 47 pivoted on the tip side of the hook member 46 via a pin 49, and an engagement pin 48 provided on the lower part of the upper support member 3 and having a spacer 44 fitted into a fastener having a male and female thread connection structure.

[0028] The upper and lower connectors P can be freely engaged with and disengaged from the engagement pin 48 by swinging the hook member 46 around the support shaft 45, and by engaging the hook member 46 with the engagement pin 48 and blocking the hook opening of the hook member 46 with the lock piece 47, the hook member 46 can be prevented from easily coming off. 9 to 12, in a multi-tiered rack unit apparatus 2B of the second embodiment, diagonal bracing members S are provided between the lower frame D and the supporting members 3 to which it is connected.

[0029] The lower end of the diagonal brace member S is fixed to the mounting seat 51 on the side surface of the front and rear members 35 of the lower frame D. 51 with a fastener 6 having a male and female screw connection structure, and the upper end of the diagonal brace member S is connected to the side of the front support member 3 with an attachment member 53 placed against the side of the front support member 3 by the fastener 6 passing through the through hole 22 in the side wall 3b. In the multi-tiered rack unit device 2 of the above-described embodiment, the upper sides of four support members 3 are connected by an upper frame U and the lower sides of the four support members 3 are connected by a lower frame D to form a rack unit R, and these rack units R are stacked one on top of the other to form the multi-tiered rack unit R. Belt mounting brackets K with headed pins 5 protruding from the front are fixed to the left and right support members 3 on the front side of the upper and lower rack units R, and a first belt B1 is attached to the upper right headed pin 5 and the lower left headed pin 5, and a second belt B2 is attached to the upper left headed pin 5 and the lower right headed pin 5.

[0030] This allows the two belts B1 and B2 to be stretched in an X-shape, thereby protecting the multi-tiered rack unit R from vertical vibrations, horizontal bending, and falling off of cargo. In addition, the multi-tier rack unit device 2 of the embodiment is provided with upper and lower connectors P that connect the upper parts of the left and right support members 3 at the rear of the lower rack unit R to the lower parts of the left and right support members 3 at the rear of the upper rack unit R.

[0031] This allows the rear portions of the stacked upper and lower rack units R to be connected together, thereby providing strong protection for the multi-tier rack unit R against vertical vibrations, horizontal deflection, and the like. Furthermore, in the multi-tiered rack unit apparatus 2 of the embodiment, diagonal bracing members S are provided between the lower frame D and the supporting members 3 to which it is connected. This prevents the upper part of the rack unit R from shaking relative to the lower part, and allows the rack unit R to firmly maintain its shape.

[0032] Furthermore, in the multi-tier rack unit device 2 of the embodiment, the belt mounting bracket K has a headed pin 5 protruding from the front of the engaging member 4 that engages with the support member 3, and a fastener 6 is provided at the rear of the engaging member 4 to fasten the engaging member 4 to the support member 3. This allows the support member 3 to be provided with protruding headed pins 5 for attaching the belts B1 and B2.

[0033] In addition, in the multi-tier rack unit device 2 of the embodiment, the engaging member 4 of the belt mounting bracket K has left and right side walls 4b formed rearward from both the left and right ends of the front wall 4a, and through holes 8 are formed in these left and right side walls 4b, and the fastener 6 is formed by a pair of screw members 6a, 6b that are inserted into the through holes 8 from the outside of the left and right side walls 4b and screwed together. This allows the fastener 6 for attaching the belt mounting bracket K to the support member 3 to be constructed simply and easily, and can be firmly fixed.

[0034] Furthermore, in the multi-tier rack unit device 2 of the embodiment, the headed pin 5 is fixed to approximately the center in the vertical and horizontal directions on the front surface of the engaging member 4, and the fastener 6 is positioned at approximately the same height as the headed pin 5 and so as to be able to abut against the back surface of the support member 3. This allows the fastener 6 to fix the fitting member 4 to the support member 3 without having to penetrate the support member 3, and also allows the load applied to the headed pin 5 to be supported efficiently.

[0035] Furthermore, in the multi-tier rack unit device 2 of the embodiment, each support member 3 of the rack unit R is formed from a square pipe, and a number of engagement recesses 21 are formed in the vertical direction on the front wall 3a, and through holes 22 are formed in the left and right side walls 3b. This allows the fitting member to be attached to the support member 3 of the rack unit R while engaging with it, and the fastener 6 to be passed through it.

[0036] In addition, in the multi-tier rack unit device 2 of the embodiment, the upper frame U and lower frame D of the rack unit R are provided at the positions facing each support member 3 with engaging members 24 that engage with the support member 3 from the front, and fasteners 6 that penetrate the engaging members 24 while they are engaged with the support member 3, and the front wall 24a of the engaging members 24 is provided with tongue pieces 26 that are inserted into the engagement recesses 21 of the support member 3.

[0037] This allows the rack unit R to be easily disassembled and assembled. Furthermore, in the multi-tiered rack unit device 2 of the embodiment, the upper frame U of the rack unit R is formed in a square frame shape connected to the upper part of the four support members 3, and the lower frame D is formed in a square frame shape connected to the lower part of the four support members 3. The ends are connected by left and right side rails 12 and a rear rail 12 to form a front opening Q. This allows the configuration of a rack unit R with a front opening Q at the bottom.

[0038] Furthermore, in the embodiment of the multi-tier rack unit device 2, an upper and lower connector P is provided between the rear of the upper frame U of the lower rack unit R and the rear crossbar 12 of the upper rack unit R, the upper and lower connector P having an engaging member 14 that engages with the rear of the upper frame U and the rear crossbar 12 and a fastener 15 that tightens the engaging member 14. This allows the rear of the upper and lower rack units R to be connected together, even if the rack unit R has a front opening Q at the bottom, and provides strong protection against vertical vibrations, horizontal bending, etc. of the multi-tiered rack unit R.

[0039] The present invention is not limited to the above-described embodiment, and the shapes, configurations, and combinations of the components can be changed. For example, a non-slip and cushioning material such as rubber may be interposed between the belt mounting bracket K and the support member 3, and bolts and nuts may be used as the fasteners 6, 15. Furthermore, the belt mounting bracket K is attached above the vertical center of the support member 3 of the rack unit R, but in the case of the lower rack unit R, it may be attached below the center of the support member 3 so that the two belts prevent the cargo N from protruding from the lower rack unit R.

[0040] Furthermore, the belt mounting bracket K, the first belt B1, and the second belt B2 are applied to the multi-tiered rack unit R in which reverse nesting racks are arranged in stages, but they may also be applied to a multi-tiered rack unit in which forward nesting racks are arranged in stages. Furthermore, the upper ends of the four support members 3 can be connected to the four corners of a rectangular frame-shaped upper frame U, and the lower ends of the four support members 3 can be connected to the four corners of a lower frame D, and the frame material of the lower frame D can be used as crossbars 12 that connect the four support members 3 to each other to form a rack unit R, or the two rectangular frames can be formed as a ceiling wall and a bottom wall to form a rack unit R, and the belt mounting bracket K, first belt B1 and second belt B2 can also be applied to such luggage storage rack units other than Nestenna. [Explanation of symbols]

[0041] 2 (2A, 2B) Multi-tier rack unit device 3 Support members 3a Front wall 3b side wall 4 Fitting member 4a Front wall 4b Left and right side walls 5 headed pins 5a head 6 Fasteners 6a, 6b Threaded members 8 through holes 11 Square Frame 12 Pier 14 Fitting member 15 Fasteners 17 Positioning member 18 Receiving member 21 Engagement recess 22 through holes 24 Fitting member 24a Front wall 26 Tongue piece 35 Front and rear members 35a Arm part 36 Front member 37 Rear member 41 Mounting material 44 spacer 45 Spindle 46 Hook member 47 Lock piece 48 Engagement pin 49 pins 51 Mounting seat 53 Mounting material B1 First Belt B2 2nd Belt D Bottom frame F Terminal fitting K Belt mounting bracket N Luggage P Upper and lower connector Q Front opening R rack unit S Bracing member U upper frame a Flange b Hexagonal hole c Male thread d Female thread

Claims

1. The upper sides of the four support members (3) are connected by an upper frame (U), and the lower sides of the four support members (3) are connected by a lower frame (D) to form a rack unit (R), and this rack unit (R) is stacked up and down in multiple stages to form a multi-stage rack unit (R), Belt mounting brackets (K) with headed pins (5) protruding from the front are fixed to the left and right support members (3) on the front side of the upper and lower rack units (R), This multi-tier rack unit device is characterized in that a first belt (B1) is attached to the upper right headed pin (5) and the lower left headed pin (5), and a second belt (B2) is attached to the upper left headed pin (5) and the lower right headed pin (5).

2. A multi-tier rack unit device as described in claim 1, characterized in that upper and lower connectors (P) are provided between the upper part of the left and right rear support members (3) of the lower rack unit (R) and the lower part of the left and right rear support members (3) of the upper rack unit (R) to connect the two.

3. 3. A multi-tier rack unit device according to claim 1, wherein a brace member (S) is provided between the lower frame (D) and the support member (3) to which it is connected.

4. A multi-tier rack unit device as described in any one of claims 1 to 3, characterized in that the belt mounting bracket (K) has a headed pin (5) protruding from the front of the engaging member (4) that engages with the support member (3), and the engaging member (4) is provided with a fastener (6) that fastens the engaging member (4) to the support member (3).

5. 5. A multi-tier rack unit device according to claim 4, characterized in that the engaging member (4) of the belt mounting bracket (K) has left and right side walls (4b) formed rearward from both left and right ends of the front wall (4a), and through holes (8) formed in the left and right side walls (4b), and the fastener (6) is formed by a pair of screw members (6a, 6b) inserted into the through holes (8) from the outside of the left and right side walls (4b) and screwed together.

6. A multi-tier rack unit device as described in claim 4 or 5, characterized in that the headed pin (5) is fixed to approximately the center in the vertical and horizontal directions of the front surface of the engaging member (4), and the fastener (6) is positioned at approximately the same height as the headed pin (5) and can abut against the back surface of the support member (3).

7. A multi-tier rack unit device as described in any one of claims 1 to 6, characterized in that each support member (3) of the rack unit (R) is formed of a square pipe, and a number of engagement recesses (21) are formed in the vertical direction on its front wall (3a), and through holes (22) are formed in its left and right side walls (3b).

8. The upper frame (U) and lower frame (D) of the rack unit (R) are provided at the portions facing each support member (3) with engaging members (24) that engage with the support member (3) from the front, and fasteners (6) that penetrate the engaging members (24) while they are engaged with the support member (3), and the front wall (24a) of the engaging members (24) is provided with tongue pieces (26) that are inserted into the engagement recesses (21) of the support member (3), as described in claim 7.

9. A multi-tiered rack unit device as described in any one of claims 1 to 6, characterized in that the upper frame (U) of the rack unit (R) is formed of a square frame connected to the upper parts of the four support members (3), and the lower frame (D) is formed in a front opening (Q) by connecting the lower ends of the four support members (3) with left and right side rails (12) and a rear rail (12).

10. A multi-tier rack unit device as described in claim 9, characterized in that an upper and lower connecting device (P) is provided between the rear of the upper frame (U) of the lower rack unit (R) and the rear crossbar (12) of the upper rack unit (R), the upper and lower connecting device (P) having an engaging member (14) that engages with the rear of the upper frame (U) and the rear crossbar (12) and a fastener (15) that tightens the engaging member (14).

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