Laboratory bench

Abstract

To provide a laboratory table capable of securing rigidity of a connection part by a pair of supports and a beam part.SOLUTION: The laboratory bench 10 includes a pair of support columns 12 and a beam part 13. The strut 12 has an overlapping part 31 in which both end parts of the second strut wall 27 are doubly overlapped from the inside on both end parts of the first strut wall 25, and is formed in a closed cross section. The beam portion 13 is disposed between the pair of support columns 12 and is attached to the overlapping portion 31.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an experimental bench.

Background Art

[0002] As an experimental bench, for example, it is known that it is installed in a laboratory such as a research institute or a university, and is used for experimental work or for placing experimental instruments and experimental equipment. The experimental bench is, for example, a pair of columns are erected at intervals on the left and right sides, the pair of columns are connected by a beam portion, brackets are provided on the front wall and the rear wall of the pair of columns, and a top plate is arranged on the beam portion and the pair of brackets (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, in a state where experimental instruments and experimental equipment are placed on the top plate of the experimental bench, it is preferable to secure a wide area on the top plate for use in experimental work. However, in order to maintain the experimental bench in a stable state, it is necessary to firmly connect the pair of columns with the beam portion and ensure the rigidity of the connecting portion formed by the pair of columns and the beam portion.

[0005] An object of the present invention is to provide an experimental bench capable of ensuring the rigidity of the connecting portion formed by a pair of columns and a beam portion.

Means for Solving the Problems

[0006] In order to solve the above problems, the present invention proposes the following means. (1) The laboratory bench according to the present invention comprises a pair of support columns formed in a closed cross-section, with overlapping sections at both ends of the first support column wall where both ends of the second support column wall are doubled from the inside, and a beam section positioned between the pair of support columns and attached to the overlapping section.

[0007] By configuring it in this way, the ends of the first support wall and the ends of the second support wall are double-layered to form an overlapping section. This increases the rigidity of the overlapping section. A beam section is attached to this overlapping section. This allows the beam section to be firmly attached to the overlapping section. Therefore, the rigidity of the connection between the pair of support columns and the beam section 13 can be ensured.

[0008] (2) In the above embodiment, the second support wall may have stepped portions along both ends of the first support wall.

[0009] This configuration provides a stepped section in the second support wall. The stepped section is strengthened, for example, by bending the second support wall. Therefore, the overlapping section can be reinforced by the stepped section. This allows the beam section to be attached to the overlapping section even more securely.

[0010] (3) In the above embodiment, welding nuts may be provided on the inner surfaces of both ends of the second support wall that face the inside of the closed cross section, and fastening portions that penetrate the beam section and the overlapping section may be screw-connected to the welding nuts.

[0011] By configuring it in this way, welded nuts are provided at both ends of the second support wall. Therefore, the overlapping section can be reinforced with welded nuts. This allows the beam section to be attached to the overlapping section even more securely. [Effects of the Invention]

[0012] According to the present invention, the rigidity of the connection between the pair of support columns and beams can be ensured. [Brief explanation of the drawing]

[0013] [Figure 1] This is a perspective view showing a laboratory bench in an embodiment of the present invention. [Figure 2] Figure 1 is a perspective view showing the laboratory bench in a disassembled state. [Figure 3] This is a perspective view showing the support column body and the first beam in a disassembled state in the embodiment. [Figure 4] Figure 1 is a cross-sectional view of the laboratory bench, broken along the line IV-IV. [Figure 5] This is a perspective view showing the support column body and the first bracket in a disassembled state in the embodiment. [Figure 6] This is a cross-sectional view showing the state in which the first bracket is attached to the support column body in the embodiment. [Modes for carrying out the invention]

[0014] The following describes an experimental bench according to one embodiment of the present invention, with reference to the drawings. Figure 1 is a perspective view showing the laboratory bench. Figure 2 is a perspective view showing the laboratory bench in a disassembled state. <Experimental test subject> As shown in Figures 1 and 2, the laboratory bench 10 is installed on the floor F in a laboratory such as a research institute or university, and is used for experimental work or for placing experimental instruments and equipment. In the diagrams, the forward direction is indicated by arrow Fr, the backward direction by arrow Rr, the left direction by arrow L, and the right direction by arrow R. Also, the upward direction is indicated by arrow U and the downward direction by arrow D. The laboratory bench 10 comprises, for example, a pair of support columns 12, a beam section 13, a pair of first brackets 14, a plurality of first drawers 15, a pair of second brackets 16, a plurality of second drawers 17, and a top plate 18.

[0015] The pair of columns 12 are arranged at intervals in the left - right direction. Of the pair of columns 12, one column 12 is arranged on the left side and the other column 12 is arranged on the right side. The one column 12 and the other column 12 are formed symmetrically. Hereinafter, the left - hand column 12 will be described as the "column 12", and the description of the right - hand column 12 will be omitted. The column 12 includes a column main body 21 and a leg portion 22.

[0016] Figure 3 is an exploded perspective view of an enlarged view of part III in Figure 2. Figure 4 is a cross - sectional view of the experimental table in Figure 1 taken along the line IV - IV. As shown in Figures 3 and 4, the column main body 21 includes a first column wall 25, a pair of ribs 26, and a second column wall 27. The first column wall 25, the pair of ribs 26, and the second column wall 27 are formed of, for example, a steel plate with a thickness of 1.6 mm. The column main body 21 is formed into a closed cross - section by joining the first column wall 25 and the second column wall 27 at the overlapping portion 31. The overlapping portion 31 will be described in detail later.

[0017] The first column wall 25 has an outer wall 41, an upper flap 42, a front wall 43, a front flap 44, a rear wall 45, and a rear flap 46. The outer wall 41 is formed in a rectangular shape that stands up in the vertical direction in an outer surface view from the left outside of the experimental table 10. The upper flap 42 is bent, for example, orthogonally to the outer wall 41 and bent right - handedly from the upper side of the outer wall 41 toward the inside of the experimental table 10.

[0018] The front wall 43 is bent, for example, orthogonally to the outer wall 41 and bent right - handedly from the front side of the outer wall 41 toward the inside of the experimental table 10. The front wall 43 has a plurality of long holes 48 extending in the vertical direction. The plurality of long holes 48 penetrate the front wall 43 in the front - rear direction and are provided at intervals in the vertical direction. In the embodiment, three of the plurality of long holes 48 will be described as an example, but the number of long holes 48 can be arbitrarily selected.

[0019] The front flap 44 is, for example, bent perpendicular to the front wall 43 and folds toward the rear from the inner edge of the front wall 43. The front flap 44 is arranged parallel to the outer wall 41. The front flap 44 has a plurality of through holes 49. The plurality of through holes 49 penetrate the front flap 44 in the left-right direction and are spaced apart in the up-down direction. In this embodiment, two through holes 49 are described as an example, but the number of through holes 49 can be arbitrarily selected.

[0020] The rear wall 45 is, for example, bent to the right from the rear edge of the outer wall 41 toward the inside of the laboratory bench 10, perpendicular to the outer wall 41. The rear wall 45 has a plurality of elongated holes 51 that extend in the vertical direction. The plurality of elongated holes 51 penetrate the rear wall 45 in the front-to-back direction and are spaced apart in the vertical direction. In this embodiment, three elongated holes 51 are described as an example, but the number of elongated holes 51 can be arbitrarily selected.

[0021] The rear flap 46 is, for example, bent in the rearward direction from the inner edge of the rear wall 45, perpendicular to the rear wall 45. The rear flap 46 is arranged parallel to the outer wall 41. The rear flap 46 has a plurality of through holes 52. The plurality of through holes 52 penetrate the rear flap 46 in the left-right direction and are spaced apart in the up-down direction. In this embodiment, two through holes 52 are described as an example, but the number of through holes 52 can be arbitrarily selected.

[0022] A pair of ribs 26 are provided on the back surface of the outer wall 41, spaced apart in the front-to-back direction. The pair of ribs 26 extend vertically along the back surface of the outer wall 41. The ribs 26 are formed in a hat-shaped cross-section, for example, with a U-shaped cross-section 54 and a pair of flanges 55. The pair of flanges 55 of the ribs 26 are joined to the back surface of the outer wall 41 by welding. Reagent racks (not shown) are attached to the pair of ribs 26.

[0023] The second support wall 27 has an inner wall 61, a front stepped portion (stepped portion) 62, a first overlapping portion 63, a first overlapping flap 64, a rear stepped portion (stepped portion) 65, a second overlapping portion 66, and a second overlapping flap 67. The inner wall 61 is positioned, for example, on the inside (i.e., the right side) of the laboratory bench 10 in the left-right direction relative to the outer wall 41. The inner wall 61 is formed in a rectangular shape that rises vertically when viewed from the inside left of the laboratory bench 10.

[0024] The inner wall 61 is positioned between the front flap 44 and the rear flap 46 of the first support wall 25. The inner wall 61, the front flap 44, and the rear flap 46 form the inner wall 71 of the support column 12. The inner wall 61 is positioned flush with the front flap 44 and the rear flap 46. That is, the inner wall 71 of the support column 12 is formed flat by the inner wall 61, the front flap 44, and the rear flap 46.

[0025] The front stepped portion 62 is bent, for example, from the front edge of the inner wall 61 toward the inside of the support column body 21. The front stepped portion 62 is positioned along the front flap 44 in close proximity to the inner edge of the front flap 44. The first overlapping portion 63 is bent from the front edge of the front stepped portion 62 and is positioned on the inside of the support column 12 relative to the front flap 44. The first overlapping portion 63 is positioned along the front flap 44.

[0026] The first overlapping portion 63 has a plurality of through holes 73. The plurality of through holes 73 penetrate the first overlapping portion 63 in the left-right direction and are spaced apart in the vertical direction. The plurality of through holes 73 are positioned opposite to the plurality of through holes 49 in the front flap 44. In this embodiment, two through holes 73 are described as an example, but the number of through holes 73 can be arbitrarily selected. Multiple welding nuts 75 are provided on the inner surface of the first overlapping portion 63. The welding nuts 75 are positioned to correspond to the multiple through holes 73 and the multiple through holes 49.

[0027] The first overlapping flap 64 is, for example, bent perpendicular to the first overlapping portion 63 from the front edge of the first overlapping portion 63 toward the outer wall 41. The first overlapping flap 64 is positioned along the front wall 43. The first overlapping flap 64 has a plurality of elongated holes 77 extending in the vertical direction. The plurality of elongated holes 77 penetrate the first overlapping flap 64 in the front-rear direction and are spaced apart in the vertical direction. The plurality of elongated holes 77 are positioned opposite to the plurality of elongated holes 48 in the front wall 43. In this embodiment, three elongated holes 77 are described as an example, but the number of elongated holes 77 can be arbitrarily selected.

[0028] The rear stepped portion 65 is bent, for example, from the rear edge of the inner wall 61 toward the inside of the support column 12. The rear stepped portion 65 is positioned along the rear flap 46 in close proximity to the inner edge of the rear flap 46. The second overlapping portion 66 is bent from the rear edge of the rear stepped portion 65 and is positioned on the inside of the support column 12 relative to the rear flap 46. The second overlapping portion 66 is positioned along the rear flap 46.

[0029] The second overlapping portion 66 has a plurality of through holes (not shown). The plurality of through holes penetrate the second overlapping portion 66 in the left-right direction and are spaced apart in the vertical direction. The plurality of through holes are positioned opposite to the plurality of through holes 52 in the rear flap 46. In this embodiment, two through holes in the second overlapping portion 66 are described as an example, but the number of through holes in the second overlapping portion 66 can be arbitrarily selected. Multiple welding nuts (not shown) are provided on the inner surface of the second overlapping portion 66. The welding nuts (not shown) are positioned in the second overlapping portion 66 at locations corresponding to multiple through holes (not shown) and multiple through holes 52.

[0030] The second overlapping flap 67 is, for example, bent perpendicular to the second overlapping portion 66 from the rear edge of the second overlapping portion 66 toward the outer wall 41. The second overlapping flap 67 is positioned along the rear wall 45. The second overlapping flap 67 has a plurality of elongated holes (not shown). The plurality of elongated holes in the second overlapping flap 67 penetrate the second overlapping flap 67 in the front-rear direction and are spaced apart in the vertical direction. The plurality of elongated holes in the second overlapping flap 67 are positioned opposite the plurality of elongated holes 51 in the rear wall 45. In this embodiment, three elongated holes in the second overlapping flap 67 are described as an example, but the number of elongated holes in the second overlapping flap 67 can be arbitrarily selected.

[0031] Here, the main support column 21 is formed in a closed cross-section by joining the first support column wall 25 and the second support column wall 27 at the overlapping portion 31. The overlapping portion 31 has a first overlapping portion 32 and a second overlapping portion 33. The first overlapping section 32 is joined by welding in a state where, for example, the first overlapping flap 64 of the second support wall 27 is double-overlaid on the front wall 43 of the first support wall 25, and further, the first overlapping section 63 of the second support wall 27 is double-overlaid on the front flap 44 of the first support wall 25. The second overlapping section 33 is joined by welding in a state where, for example, the second overlapping flap 67 of the second support wall 27 is double-overlaid on the rear wall 45 of the first support wall 25, and further, the second overlapping section 66 of the second support wall 27 is double-overlaid on the rear flap 46 of the first support wall 25.

[0032] The front wall 43 and front flap 44 of the first support wall 25 constitute the front end of the first support wall 25. Therefore, the front end of the first support wall 25 is a highly rigid section formed in an L-shape in cross-section by the front wall 43 and front flap 44. The rear wall 45 and rear flap 46 of the first support wall 25 constitute the rear end of the first support wall 25. The rear end of the first support wall 25 is a highly rigid section formed in an L-shape in cross-section by the rear wall 45 and rear flap 46.

[0033] Furthermore, the first overlapping portion 63 and the first overlapping flap 64 of the second support wall 27 constitute the front end of the second support wall 27. The front end of the second support wall 27 is a highly rigid portion formed in an L-shape in cross-section by the first overlapping portion 63 and the first overlapping flap 64. The second overlapping portion 66 and the second overlapping flap 67 of the second support wall 27 constitute the rear end of the second support wall 27. The rear end of the second support wall 27 is a highly rigid portion formed in an L-shape in cross-section by the second overlapping portion 66 and the second overlapping flap 67.

[0034] Therefore, the front end of the first support wall 25 and the front end of the second support wall 27 are joined by welding to form the first overlapping section 32. In addition, the rear end of the first support wall 25 and the rear end of the second support wall 27 are joined by welding to form the second overlapping section 33. That is, the ends of both the first support wall 25 (front end and rear end) and both ends of the second support wall 27 (front end and rear end) are joined by overlapping them twice and welding to form the overlapping section 31.

[0035] As shown in Figures 1 and 2, the legs 22 are provided at the lower end of the support column body 21. The legs 22 extend in the front-rear direction relative to the lower end of the support column body 21. When the legs 22 are placed on the floor surface F, the support column body 21 is held in an elevated position above the floor surface F.

[0036] <Beam> As shown in Figures 1 and 2, the beam section 13 is positioned between a pair of support columns 12. The beam section 13 extends in the left-right direction. The beam section 13 comprises a first beam 81, a second beam 82, and a third beam 83. The first beam 81, the second beam 82, and the third beam 83 are formed from, for example, steel plates with a thickness of 1.6 mm. The first beam 81 and the second beam 82 are formed symmetrically in the front-back direction. Therefore, the first beam 81 will be described below, and the description of the second beam 82 will be omitted.

[0037] As shown in Figures 3 and 4, the first beam 81 includes an outer wall beam 91, an upper wall beam 92, an inner wall beam 93, an upper flap beam 94, a lower wall beam 95, a lower flap beam 96, and a pair of joints 97. The outer wall beam 91 is positioned between a pair of support columns 12 and extends in the left-right direction. The outer wall beam 91 is formed in a rectangular shape that extends laterally when viewed from the front. The upper wall beam 92 is, for example, bent perpendicular to the outer wall beam 91 from the upper side of the outer wall beam 91 toward the second beam 82 (see Figure 1).

[0038] The inner wall beam 93 is bent downward from the inner edge of the upper wall beam 92, for example, perpendicular to the upper wall beam 92. The upper flap beam 94 is bent toward the outer wall beam 91 from the lower edge of the inner wall beam 93, for example, perpendicular to the inner wall beam 93. The lower wall beam 95 is bent toward the second beam 82 (see Figure 1) from the lower edge of the outer wall beam 91, for example, perpendicular to the outer wall beam 91. The lower flap beam 96 is bent upward from the inner edge of the lower wall beam 95, for example, perpendicular to the lower wall beam 95.

[0039] As shown in Figures 2 to 4, a pair of joints 97 are provided on the left and right sides of the exterior wall beam 91. The pair of joints 97 are formed symmetrically. Therefore, the joint 97 on the left side will be described below as simply the joint 97, and the description of the joint 97 on the right side will be omitted. The joint 97 is bent inward from the left side of the outer wall beam 91, perpendicular to the outer wall beam 91. The joint 97 has a plurality of through holes 98. The plurality of through holes 98 penetrate the joint 97 in the left-right direction and are spaced apart in the vertical direction. The plurality of through holes 98 are positioned opposite to the plurality of through holes 49 in the front flap 44. In this embodiment, two through holes 98 are described as an example, but the number of through holes 98 can be arbitrarily selected.

[0040] As shown in Figures 2 and 3, the third beam 83 is joined, for example, to the lower flap beam 96 of the first beam 81 and the lower flap beam 96 of the second beam 82. The beam section 13 is formed in a U shape by the first beam 81, the second beam 82, and the third beam 83. The left end of the beam section 13 is attached to the left support column body 21. The right end of the beam section 13 is attached to the right support column body 21. The configuration in which the left end of the beam section 13 is attached to the left support column body 21 is symmetrical to the configuration in which the right end of the beam section 13 is attached to the right support column body 21. Therefore, the following explanation will describe the example in which the left end of the beam section 13 is attached to the left support column body 21, and the explanation of the example in which the right end of the beam section 13 is attached to the right support column body 21 will be omitted.

[0041] As shown in Figures 3 and 4, the joint 97 of the first beam 81 is attached to the front flap 44 and the first overlap 63 at the first overlap 32 by fastening parts 101. In this embodiment, a "bolt 101" will be used as an example of the fastening part 101. Specifically, the bolt 101 is inserted through the through hole 98 of the joint 97, the through hole 49 of the front flap 44, and the through hole 73 of the first overlap 63 from the first beam 81 side. The inserted bolt 101 is screw-connected to the weld nut 75 of the first overlapping portion 63. Thus, the joint 97 is attached to the front flap 44 and the first overlapping portion 63 by the bolt 101. In this embodiment, two bolts 101 are used as an example, but the number of bolts 101 can be arbitrarily selected.

[0042] As shown in Figures 1 and 2, the first beam 81 is attached to the first overlapping section 32 of the support column body 21. Similarly, the second beam 82 is attached to the second overlapping section 33 of the support column body 21. As a result, the left end of the beam section 13 is attached to the left support column body 21, and the right end of the beam section 13 is attached to the right support column body 21.

[0043] <First bracket, first drawer, second bracket, second drawer, top panel> A pair of first brackets 14 are attached to the front of the left and right support column bodies 21. Multiple first drawers 15 are arranged using the pair of first brackets 14 and multiple first support brackets 105. A pair of second brackets 16 are attached to the rear of the left and right support column bodies 21. Multiple second drawers 17 are arranged using the pair of second brackets 16 and multiple second support brackets 106. In this configuration, a top plate 18 is attached from above to the pair of support columns 12, beam section 13, pair of first brackets 14, and pair of second brackets 16, etc.

[0044] The pair of first brackets 14 and the pair of second brackets 16 are similarly attached to the left and right support column bodies 21. Therefore, below, an example of attaching one first bracket 14 to the left support column body 21 will be explained with reference to Figures 5 and 6, and the explanation of attaching the other brackets will be omitted.

[0045] <First bracket> Figure 5 is a perspective view showing the left support column body and the first bracket in a disassembled state. Figure 6 is a cross-sectional view showing the left support column body with the first bracket attached. As shown in Figures 5 and 6, the first bracket 14 is formed from, for example, a steel plate with a thickness of 1.6 mm. The first bracket 14 has a plurality of locking claws 112. In this embodiment, three locking claws 112 are described as an example, but the number of locking claws 112 can be arbitrarily selected.

[0046] The multiple locking claws 112 are locked in the first overlapping portion 32 by being inserted into the elongated holes 48 in the front wall 43 and the elongated holes 77 in the first overlapping flap 64. As a result, the first bracket 14 is attached to the front wall 43 and the first overlapping flap 64 (first overlapping portion 32) by the multiple locking claws 112.

[0047] Similarly, as shown in Figures 1 and 2, another first bracket 14 is also attached to the first overlapping portion 32. Furthermore, a pair of second brackets 16 are also attached to the second overlapping portion 33.

[0048] As described above, according to the experimental bench 10 of the embodiment, as shown in Figures 3 and 4, the front end of the first support wall 25 is composed of a front wall 43 and a front flap 44. The rear end of the first support wall 25 is composed of a rear wall 45 and a rear flap 46. In addition, the front end of the second support wall 27 is composed of a first overlapping section 63 and a first overlapping flap 64. The rear end of the second support wall 27 is composed of a second overlapping section 66 and a second overlapping flap 67. Furthermore, the front end of the first support wall 25 and the front end of the second support wall 27 were joined by welding to form the first overlapping section 32. The rear end of the first support wall 25 and the rear end of the second support wall 27 were joined by welding to form the second overlapping section 33. The first overlapping section 32 and the second overlapping section 33 formed the overlapping section 31.

[0049] Specifically, the overlapping section 31 was formed by joining the ends (front and rear) of the first support wall 25 and the ends (front and rear) of the second support wall 27 in a double overlapping manner. This increases the rigidity of the overlapping section 31. The first beam 81 and the second beam 82 of the beam section 13 were attached to this overlapping section 31. This allows the beam section 13 to be firmly attached to the overlapping section 31. Therefore, the rigidity of the connection between the pair of support columns 12 and the beam section 13 can be ensured. As a result, the experimental bench 10 can be maintained in a stable state.

[0050] Furthermore, the second support wall 27 has a front stepped section 62 and a rear stepped section 65. The front stepped section 62 and the rear stepped section 65 are strengthened, for example, by bending the second support wall 27. The front stepped section 62 is positioned along the front flap 44 of the first support wall 25. The rear stepped section 65 is positioned along the rear flap 46 of the first support wall 25. Thus, the overlapping section 31 can be reinforced by the front stepped section 62 and the rear stepped section 65. This allows the beam section 13 to be attached to the overlapping section 31 even more securely.

[0051] Furthermore, the front stepped portion 62 is positioned close to the inner edge of the front flap 44. Similarly, the rear stepped portion 65 is positioned close to the inner edge of the rear flap 46. This allows the overlapping portion 31 to be reinforced more effectively by the front stepped portion 62 and the rear stepped portion 65.

[0052] In addition, welding nuts 75 were provided at both ends of the second support wall (specifically, the first overlapping section 63 and the second overlapping section 66). Therefore, the overlapping section 31 can be reinforced with welding nuts 75. This allows the beam section 13 to be attached to the overlapping section 31 even more securely.

[0053] Furthermore, in the first support wall 25, the upper flap 42 is bent inward from the upper edge of the outer wall 41. Thus, the first support wall 25 can be reinforced with the upper flap 42. This allows the beam section 13 to be attached to the overlapping section 31 even more securely.

[0054] Furthermore, as shown in Figures 5 and 6, the first bracket 14 is attached to the front wall 43 and the first overlapping flap 64 by a plurality of locking claws 112. The front wall 43 and the first overlapping flap 64 are doubled up to form part of the first overlapping section 32. In other words, the first bracket 14 is attached to the highly rigid first overlapping section 32.

[0055] Similarly, as shown in Figures 1 and 2, another first bracket 14 is also attached to the highly rigid first overlapping section 32. Furthermore, a pair of second brackets 16 are also attached to the highly rigid second overlapping section 33. This allows the laboratory bench 10 to stably attach the top plate 18 to the pair of support columns 21, the beam section 13, the pair of first brackets 14, and the pair of second brackets 16.

[0056] It should be noted that the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

[0057] In the above embodiment, the first support wall 25, the pair of ribs 26, and the second support wall 27 were formed from, for example, a steel plate with a thickness of 1.6 mm. Also, the first beam 81, the second beam 82, and the third beam 83 of the beam section 13 were formed from a steel plate with a thickness of 1.6 mm. Furthermore, the first bracket 14 was formed from a steel plate with a thickness of 1.6 mm. However, the plate thickness and material of the first support wall 25, the pair of ribs 26, the second support wall 27, the first beam 81, the second beam 82, the third beam 83, and the first bracket 14 are not limited to the above embodiment. For example, the plate thickness of the first support wall 25, the pair of ribs 26, the second support wall 27, the first beam 81, the second beam 82, the third beam 83, and the first bracket 14 may be 1.2 mm, or the plate thickness may differ for each member. Also, the first support wall 25, the pair of ribs 26, the second support wall 27, the first beam 81, the second beam 82, the third beam 83, and the first bracket 14 may be partially made of a material such as aluminum.

[0058] In the above embodiment, the second support wall 27 has an inner wall 61, a front stepped portion (stepped portion) 62, a first overlapping portion 63, a first overlapping flap 64, a rear stepped portion (stepped portion) 65, a second overlapping portion 66, and a second overlapping flap 67, with the first overlapping portion 63 and the second overlapping portion 66 each having a plurality of through holes. A plurality of welding nuts are provided on the inner surfaces of the first overlapping portion 63 and the second overlapping portion 66, respectively, and bolts 101 are fastened to the welding nuts of the first overlapping portion 63 and the second overlapping portion 66. However, the configuration of the fastening portion 101 is not limited to the above embodiment. For example, stud bolts may be provided on the inner surfaces of the first overlapping portion 63 and the second overlapping portion 66 so as to pass through the through holes, and fastened with nuts.

[0059] In the above embodiment, one laboratory bench 10 was described, but multiple laboratory benches 10 may be used. For example, multiple laboratory benches 10 may be arranged in a row in the left-right direction of one laboratory bench 10.

[0060] In the above embodiment, the second support wall 27 had a front stepped portion 62 bent from the front edge of the inner wall 61 toward the inside of the support body 21, and a rear stepped portion 65 bent from the rear edge of the inner wall 61 toward the inside of the support 12. However, the second support wall 27 does not necessarily have to have the front stepped portion 62 and the rear stepped portion 65. However, having the front stepped portion 62 and the rear stepped portion 65 of the second support wall 27 has the advantage of improving the section modulus and allowing the overlapping portion 31 to be reinforced more appropriately by the front stepped portion 62 and the rear stepped portion 65.

[0061] Furthermore, without departing from the spirit of the present invention, the components in the above embodiments may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate. [Explanation of Symbols]

[0062] 10... Experimental bench 12...Strut 13...beam part 21…Main support column 25…1st support wall 27…Second support wall 31... Overlapping section 32...First overlapping section 33...Second superposition section 62... Front step section (step section) 65...Rear step section (step section) 75... Welding nuts 101... Bolt (fastening part)

Claims

1. A pair of pillars formed in a closed cross-section, with the ends of the second pillar wall overlapping each other from the inside at both ends of the first pillar wall, and the ends of the second pillar wall overlapping each other twice at both ends of the first pillar wall. It comprises a beam portion positioned between the pair of support columns and attached to the overlapping portion, The laboratory bench is characterized in that the second support wall has stepped portions along both ends of the first support wall.

2. Weld nuts are provided on the inner surfaces of both ends of the second support wall, facing the inner surface of the closed cross-section. The laboratory bench according to claim 1, characterized in that the welding nut has a fastening portion that penetrates the beam portion and the overlapping portion and is screw-connected to it.

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