Workbench

Abstract

To provide a workbench in which a height of a work floor can be smoothly adjusted.SOLUTION: A workbench comprises a work floor and a support portion. The support portion includes a first support portion supporting one side in a long side direction of the work floor, and a second support portion supporting the other side in the long side direction of the work floor. The first support portion and the second support portion each include: a pair of posts provided apart in a short side direction of the work floor; and a first connecting member and a second connecting member extending in the short side direction so as to connect the pair of posts. Each of the pair of posts has: a first member extending in a vertical direction; and a second member extending above the first member and supported by the first member so as to be movable in a vertical direction with respect to the first member. The first connecting member connects the first members to each other, and the second connecting member connects the second members to each other. At least one of the first support portion and the second support portion has an auxiliary member that extends in a vertical direction and is expandable and contractible in a vertical direction so as to connect the first connecting member and the second connecting member.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a workbench. [Background technology]

[0002] BACKGROUND ART Conventionally, various mobile work tables with adjustable work floor heights have been used for carrying out interior construction work on buildings and the like (see, for example, Patent Document 1).

[0003] Fig. 1 shows an example of a conventional workbench, (a) is a front view, and (b) is a left side view. Fig. 2 and Fig. 3 are diagrams for explaining a method for adjusting the height of the work floor of the workbench in Fig. 1.

[0004] The workbench 100 shown in Figures 1 to 3 comprises a work floor 102 and a pair of legs 104 that support the work floor 102. Each leg 104 comprises a pair of support columns 106 and a pair of cross members 108. The work floor 102 has a rectangular shape in a plan view, and the four corners of the work floor 102 are supported by the four support columns 106 of the pair of legs 104.

[0005] Each support 106 has a cylindrical first member 106a and a cylindrical second member 106b. The first member 106a is supported by casters 112. The first member 106a is inserted into the second member 106b so that the second member 106b can move up and down relative to the first member 106a. The work platform 102 is supported by the second member 106b.

[0006] Tie members 110a and 110b are respectively provided on one side and the other side in the long side direction of the work floor 102 so as to connect the support 106 of one leg 104 to the support 106 of the other leg 104. The tie member 110a is provided to connect the first members 106a together, and the tie member 110b is provided to connect the second members 106b together. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Utility Model Registration No. 3232403 Summary of the Invention [Problem to be solved by the invention]

[0008] 2, when adjusting the height of the work floor 102, the worker first adjusts the height of the pair of second members 106b on one side in the long side direction. Then, the worker adjusts the height of the pair of second members 106b on the other side in the long side direction. In this way, the worker can adjust the height of the work floor 102 by adjusting the height of the pair of second members 106b on one side and the other side in the long side direction.

[0009] Incidentally, in order to smoothly adjust the height of the pair of second members 106b on one side or the other side in the long side direction, it is preferable to move the pair of second members 106b evenly. However, as shown in Fig. 3, when adjusting the height of the pair of second members 106b, the balance between the height of one second member 106b and the height of the other second member 106b may be lost. In this case, it is not possible to smoothly adjust the height of the pair of second members 106b.

[0010] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a workbench that allows the height of the work floor to be smoothly adjusted. [Means for solving the problem]

[0011] The present invention relates to the following workbench.

[0012] (1) a work platform; a support portion that supports the work floor, The support portion is A first support portion that supports the work floor on one side in the long side direction of the work floor; a second support portion that supports the work floor on the other side in the long side direction, The first support portion and the second support portion each include: A pair of support columns provided apart in the short side direction of the work floor; a first connecting member and a second connecting member extending in the short side direction and spaced apart in the up-down direction so as to connect the pair of columns; Each of the pair of support columns is a first member extending in the vertical direction; a second member extending above the first member and supported by the first member so as to be movable in the up and down direction relative to the first member; the first connecting member connects the first members of the pair of columns together, the second connecting member connects the second members of the pair of columns above the first connecting member, A workbench, wherein at least one of the first support portion and the second support portion has an auxiliary member that extends vertically at an intermediate position between the pair of pillars in the short side direction to connect the first connecting member and the second connecting member, and is expandable and contractible in the vertical direction.

[0013] (2) A workbench described in (1) above, wherein one end and the other end of the second connecting member in the short side direction are each attached to the support so that they can swing up and down relative to the support.

[0014] (3) The auxiliary member includes a first auxiliary member extending in the vertical direction and fixed to the first connecting member, and a second auxiliary member extending in the vertical direction and fixed to the second connecting member, The workbench described in (1) or (2) above, wherein the second auxiliary member is connected to the first auxiliary member so that it can move vertically relative to the first auxiliary member and so that horizontal movement relative to the first auxiliary member is restricted.

[0015] (4) At least one of the first auxiliary member and the second auxiliary member has a hollow shape, The workbench described in (3) above, wherein the other of the first auxiliary member and the second auxiliary member is inserted into the one of the first auxiliary member and the second auxiliary member.

[0016] (5) A workbench described in any one of (1) to (4) above, further comprising a biasing member that applies a force to the auxiliary member in a direction that extends the auxiliary member in the vertical direction.

[0017] (6) The support portion is configured to be extendable so as to be set between a first state in which the first support portion and the second support portion support the four corners of the work floor, and a second state in which the length in the long side direction is smaller and the length in the short side direction is larger than in the first state, The first connecting material and the second connecting material are each configured to be expandable and contractible in the short side direction, One end and the other end of the first connecting member in the short side direction are attached to the support pillar so as to be able to swing horizontally relative to the support pillar, A workbench described in any of (1) to (5) above, wherein one end and the other end of the second connecting member in the short side direction are each attached to the support so that they can swing horizontally relative to the support.

[0018] (7) A workbench described in (6) above, wherein the auxiliary member is connected to a position that is the center of the short side direction of the first connecting member in the first state and a position that is the center of the short side direction of the second connecting member in the first state.

[0019] (8) A workbench described in any one of (1) to (7) above, wherein the auxiliary member is arranged inward in the long side direction from the first connecting member and the second connecting member. [Effects of the Invention]

[0020] According to the present invention, the height of the work platform can be smoothly adjusted. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a diagram showing a conventional workbench. [Figure 2] FIG. 2 is a diagram for explaining a method for adjusting the height of the work floor of the workbench of FIG. [Figure 3] FIG. 3 is a diagram for explaining a method for adjusting the height of the work floor of the workbench of FIG. [Figure 4] FIG. 4 is a schematic front view showing a workbench according to one embodiment of the present invention. [Figure 5] FIG. 5 is a schematic left side view of the workbench of FIG. [Figure 6] FIG. 6 is a schematic plan view showing the work floor. [Figure 7] FIG. 7 is a schematic plan view showing the support portion. [Figure 8] FIG. 8 is an enlarged view showing an example of a connection portion between one end of a connecting material and a first member. [Figure 9] FIG. 9 is a diagram showing the relationship between the connecting material and the auxiliary member. [Figure 10] FIG. 10 is a schematic front view showing the workbench when the support portion is in the second state. [Figure 11] FIG. 11 is a schematic plan view showing the support part in the second state. [Figure 12] FIG. 12 is a schematic front view showing the workbench with the work floor folded down. [Figure 13] FIG. 13 is a schematic front view showing the workbench when the position of the work floor is raised. [Figure 14] FIG. 14 is a schematic left side view showing the workbench when the work floor is raised. [Figure 15] FIG. 15 is a diagram showing a modified example of the auxiliary member. [Figure 16] FIG. 16 shows an auxiliary member to which a gas spring is attached. DETAILED DESCRIPTION OF THE INVENTION

[0022] (Workbench configuration) Hereinafter, a workbench according to an embodiment of the present invention will be described with reference to the drawings. Fig. 4 is a schematic front view showing a workbench according to an embodiment of the present invention, and Fig. 5 is a schematic left side view of the workbench of Fig. 4.

[0023] As shown in Figures 4 and 5, the workbench 10 of this embodiment comprises a work floor 12, a support portion 14 that supports the work floor 12, a handrail portion 16 that is arranged to surround the periphery of the work floor 12, and a plurality of casters 18 (four in this embodiment) that support the support portion 14.

[0024] Although not shown in the drawings to avoid cluttering the drawings, a ladder is used when a worker ascends or descends to the work platform 12. As the configuration of the ladder can be any of various known configurations of ladders, a detailed description of the ladder will be omitted. The handrail section 16 is detachably provided on the work platform 12. The handrail section 16 is attached to the work platform 12 when the worker performs work. As the handrail section 16 can be any of various known configurations of handrails used in conventional work platforms, a detailed description will be omitted.

[0025] FIG. 6 is a schematic plan view showing the working floor 12. As shown in FIG. 6, in this embodiment, the working floor 12 has a rectangular shape when viewed from above. The working floor 12 has a rectangular shape with corners 12a to 12d at its four corners. The working floor 12 has a first floor section 20 and a second floor section 22 that are arranged side by side in the long side direction of the working floor 12. Hereinafter, when simply referring to the long side direction, this means the long side direction of the working floor 12. Furthermore, when simply referring to the short side direction, this means the short side direction of the working floor 12.

[0026] In this specification, the rectangular work floor is not limited to a work floor having a perfect rectangular shape as shown in Fig. 6, but includes a work floor configured to form a substantially rectangular shape overall. When the work floor is not a perfect rectangle, the long side direction means the longitudinal direction of the work floor, and the short side direction means the lateral direction of the work floor. In this embodiment, the four corners 12a to 12d of the work floor 12 are bent at right angles when viewed from above, but for example, the corners may be chamfered when viewed from above.

[0027] The first floor section 20 has a rectangular frame body 20a when viewed from above and a floor material 20b fixed onto the frame body 20a. Similarly, the second floor section 22 has a rectangular frame body 22a when viewed from above and a floor material 22b fixed onto the frame body 22a. In this embodiment, mesh floor materials are used as the floor materials 20b, 22b. Note that various known floor materials, such as plank floor materials, can be used as the floor materials 20b, 22b.

[0028] Fig. 7 is a schematic plan view showing the support unit 14. As shown in Figs. 4, 5, and 7, the support unit 14 has a first support unit 30 that supports the working floor 12 on one side in the long side direction, a second support unit 32 that supports the working floor 12 on the other side in the long side direction, and a third support unit 34 that supports the center of the working floor 12. In this embodiment, the second support unit 32 has a configuration obtained by rotating the first support unit 30 by 180 degrees when viewed from above. Therefore, the following will mainly describe the first support unit 30, and a detailed description of the second support unit 32 will be omitted.

[0029] The first support portion 30 has support members 30a and 30b, connecting members 30c and 30d (see FIG. 5), and an auxiliary member 30e. In this embodiment, the connecting member 30c corresponds to the first connecting member, and the connecting member 30d corresponds to the second connecting member.

[0030] The support body 30a has a support column 40 extending in the vertical direction and cross members 42a, 42b extending horizontally from the support column 40. The support body 30b has a support column 44 extending in the vertical direction and cross members 46a, 46b extending horizontally from the support column 44. The support column 40 and the support column 44 are spaced apart from each other in the short side direction. In this embodiment, the support column 40 supports a corner 12a of the work floor 12, and the support column 44 supports a corner 12b of the work floor 12. The support column 40 and the support column 44 are each supported by a caster 18.

[0031] As shown in FIGS. 4 and 5, the support column 40 has a first member 40a, a second member 40b, and a third member 40c. The first member 40a is supported by a caster 18 and is provided to extend in the vertical direction. The caster 18 is attached to the lower end of the support column 40 (first member 40a) so as to be rotatable about a rotation axis extending in the vertical direction relative to the support column 40. The second member 40b extends above the first member 40a and is supported by the first member 40a so as to be movable in the vertical direction relative to the first member 40a. The third member 40c extends above the second member 40b and is supported by the second member 40b so as to be movable in the vertical direction relative to the second member 40b. The third member 40c also supports the work platform 12 from below.

[0032] In this embodiment, the first member 40a, the second member 40b, and the third member 40c are each formed in a cylindrical shape (a rectangular cylindrical shape in this embodiment). The first member 40a and the third member 40c are inserted into the second member 40b. In this embodiment, the first member 40a and the second member 40b are connected to each other so that the vertical position of the second member 40b relative to the first member 40a can be adjusted. The second member 40b and the third member 40c are connected to each other so that the vertical position of the third member 40c relative to the second member 40b can be adjusted. The configuration for adjusting the position of the second member 40b relative to the first member 40a and the configuration for adjusting the position of the third member 40c relative to the second member 40b can be the same as that of a known workbench with a height adjustment function, and therefore detailed description thereof will be omitted.

[0033] 5, the support column 44 has a first member 44a, a second member 44b, and a third member 44c. A caster 18 is attached to the lower end of the support column 44 (first member 44a) so as to be rotatable around a rotation axis extending in the vertical direction relative to the support column 44. Note that the first member 44a, the second member 44b, and the third member 44c are configured in the same manner as the first member 40a, the second member 40b, and the third member 40c, and therefore a detailed description of the support column 44 will be omitted.

[0034] As shown in Figures 4, 5, and 7, the horizontal member 42a of the support body 30a and the horizontal member 46a of the support body 30b intersect in an X-shape when viewed from above and are connected to each other so as to be horizontally rotatable relative to each other. Also, as shown in Figures 4 and 5, the horizontal member 42b of the support body 30a and the horizontal member 46b of the support body 30b intersect in an X-shape when viewed from above and are connected to each other so as to be horizontally rotatable relative to each other. Although not shown to avoid cluttering the drawings, one or more vertical members may be provided to connect the horizontal members 42a and 42b. Similarly, one or more vertical members may be provided to connect the horizontal members 46a and 46b.

[0035] As shown in FIG. 5, the connecting member 30c is provided to connect the first member 40a and the first member 44a. In this embodiment, the connecting member 30c is configured to be expandable and contractible in the short side direction. Specifically, the connecting member 30c includes a columnar or cylindrical inner member 31a and a cylindrical outer member 31b. The inner member 31a is inserted into the outer member 31b so as to be slidable in the axial direction of the outer member 31b. One end of the inner member 31a is attached to the first member 40a, and one end of the outer member 31b is attached to the first member 44a.

[0036] The connecting member 30d is provided to connect the second member 40b and the second member 44b. In this embodiment, the connecting member 30d is configured to be expandable in the short side direction, similar to the connecting member 30c. Although detailed description will be omitted, similar to the connecting member 30c, the connecting member 30d includes an inner member 31c and an outer member 31d. One end of the inner member 31c is attached to the second member 40b, and one end of the outer member 31d is attached to the second member 44b.

[0037] In this embodiment, one end of tether 30c is provided so as to be swingable horizontally and vertically relative to first member 40a, and the other end of tether 30c is provided so as to be swingable horizontally and vertically relative to first member 44a. Similarly, one end of tether 30d is provided so as to be swingable horizontally and vertically relative to second member 40b, and the other end of tether 30d is provided so as to be swingable horizontally and vertically relative to second member 44b. An example of the configuration of the connection between the tether and the support will be briefly described below.

[0038] Fig. 8 is an enlarged view showing an example of a connection portion between one end of the connecting member 30c (inner member 31a) and the first member 40a. In the example shown in Fig. 8, the inner member 31a of the connecting member 30c is attached to the first member 40a via a connecting member 48. In this embodiment, the connecting member 48 has a bottom plate portion 48a, an upper plate portion 48b, and a lower plate portion 48c. The bottom plate portion 48a is fixed to the first member 40a.

[0039] The tip of the inner member 31a is positioned between the upper plate portion 48b and the lower plate portion 48c. The tip of the inner member 31a is connected to the connecting member 48 by a bolt 50 and a nut 52. In this embodiment, the tip of the inner member 31a is pivotable around the shank 50a of the bolt 50. Furthermore, in this embodiment, the shank 50a of the bolt 50 is inserted into the inner member 31a so that the tip of the inner member 31a can tilt upward and downward relative to the horizontal direction between the upper plate portion 48b and the lower plate portion 48c. With this configuration, one end of the connecting member 30c is attached to the first member 40a so as to be pivotable horizontally and up and down relative to the first member 40a. Although detailed description will be omitted, the outer member 31b, the inner member 31c, and the outer member 31d are similarly attached to the first member 44a, the second member 40b, and the second member 44b.

[0040] 4, 5, and 7, auxiliary member 30e is provided so as to extend vertically at an intermediate position between support column 40 and support column 44 in the short-side direction and to connect connecting member 30c and connecting member 30d. Auxiliary member 30e is configured to be extendable and contractible in the vertical direction. In this embodiment, auxiliary member 30e is provided inward (toward the center of workbench 10) from connecting member 30c and connecting member 30d in the long-side direction.

[0041] 9 is a diagram showing the relationship between the connecting members 30c, 30d, and auxiliary members 30e. In FIG. 9, (a) is a diagram showing the connecting members 30c, 30d, and auxiliary members 30e as viewed from the outside of the workbench 10 in the long side direction, (b) is a cross-sectional view showing the bb portion of (a), (c) is an enlarged cross-sectional view showing the cc portion of (a), and (d) is an enlarged cross-sectional view showing the dd portion of (a).

[0042] As shown in FIGS. 5 and 9 , in this embodiment, auxiliary member 30e includes a first auxiliary member 54 extending in the vertical direction and attached to connecting member 30c, and a second auxiliary member 56 extending in the vertical direction and attached to connecting member 30d. Second auxiliary member 56 is connected to first auxiliary member 54 so as to be movable in the vertical direction relative to first auxiliary member 54 and so as to be restricted from moving in the horizontal direction relative to first auxiliary member 54. In this embodiment, first auxiliary member 54 and second auxiliary member 56 each have a cylindrical shape. Second auxiliary member 56 is inserted into first auxiliary member 54 so as to be movable in the vertical direction along the inner surface of first auxiliary member 54. As shown in FIG. 9 , a notch 54a is formed in the upper portion of first auxiliary member 54 to allow a connecting member 68 (described later) to move in the vertical direction.

[0043] A plate-shaped connecting member 58 is provided so as to protrude upward from the connecting member 30c (outer member 31b). The connecting member 58 is fixed to the connecting member 30c (outer member 31b). Furthermore, a plate-shaped connecting member 60 is provided so as to protrude in the long side direction from the first auxiliary member 54. The connecting member 60 is fixed to the first auxiliary member 54. The connecting member 58 and the connecting member 60 are fixed to each other using a bolt 62 and a nut 64. In this way, the first auxiliary member 54 is fixed to the connecting member 30c (outer member 31b).

[0044] A plate-shaped connecting member 66 is provided so as to protrude upward from the connecting member 30d (outer member 31d). The connecting member 66 is fixed to the connecting member 30d (outer member 31d). Furthermore, a plate-shaped connecting member 68 is provided so as to protrude in the long side direction from the second auxiliary member 56. The connecting member 68 is fixed to the second auxiliary member 56. The connecting member 66 and the connecting member 68 are fixed to each other using a bolt 70 and a nut 72. In this way, the second auxiliary member 56 is fixed to the connecting member 30d (outer member 31d).

[0045] As described above, the second support part 32 has a configuration obtained by rotating the first support part 30 by 180 degrees when viewed from above. Therefore, as shown in Figures 4 and 7, the second support part 32 has the same configuration as the first support part 30, and includes supports 30a and 30b, connecting members 30c and 30d (see Figure 7), and an auxiliary member 30e.

[0046] At the center of the long side of the workbench 10, the tip of the cross member 42a of the first support member 30 and the tip of the cross member 46a of the second support member 32 are connected to each other so as to be horizontally rotatable relative to each other. Similarly, the tip of the cross member 46a of the first support member 30 and the tip of the cross member 42a of the second support member 32 are connected to each other so as to be horizontally rotatable relative to each other. As shown in FIG. 4, at the center of the long side of the workbench 10, the tip of the cross member 42b of the first support member 30 and the tip of the cross member 46b of the second support member 32 are connected to each other so as to be horizontally rotatable relative to each other. Similarly, the tip of the cross member 46b of the first support member 30 and the tip of the cross member 42b of the second support member 32 are connected to each other so as to be horizontally rotatable relative to each other.

[0047] As shown in FIG. 4, a connecting member 74 extending in the long side direction is provided on one side in the short side direction to connect the lower end of the support pillar 40 of the first support portion 30 to the lower end of the support pillar 44 of the second support portion 32. In this embodiment, the connecting member 74 is provided to connect the lower end of the first member 40a to the lower end of the first member 44a. As shown in FIG. 10 described later, the connecting member 74 is configured so that the central portion in the long side direction can bend upward. Although not shown in the figure, a connecting member similar to the connecting member 74 is also provided on the other side in the short side direction to connect the lower end of the support pillar 40 of the first support portion 30 to the lower end of the support pillar 44 of the second support portion 32.

[0048] With the above-described configuration, the support section 14 is configured to be extendable and retractable in the long side direction. Fig. 10 is a diagram showing the workbench 10 with the support section 14 retracted in the long side direction, and Fig. 11 is a schematic plan view showing the support section 14 retracted in the long side direction. Note that Fig. 10 and Fig. 12, which will be described later, show the workbench 10 with the handrail section 16 removed. Also, Figs. 10 and 12 omit the illustration of the auxiliary member 30e.

[0049] 4, 7, 10, and 11, in this embodiment, the support parts 14 are configured to be settable between a first state (the state shown in FIGS. 4 and 7) in which they support the four corners of the work floor 12, and a second state (the state shown in FIGS. 10 and 11) in which they are shorter in length in the long side direction and longer in length in the short side direction than in the first state. In this embodiment, the state in which the length of the support parts 14 in the long side direction is shortest is the second state.

[0050] As shown in FIGS. 7 and 11 , when the support unit 14 changes from the first state to the second state, the support columns 40 and 44 of the first support unit 30 move in the short-side direction so that the distance between them increases when viewed from above. At this time, both ends of the tying members 30c and 30d swing horizontally relative to the tying members 40 and 44, and the tying members 30c and 30d extend in the short-side direction. As shown in FIG. 11 , in the support unit 14 in the second state, the auxiliary member 30e is positioned at a position offset from the midpoint between the tying members 40 and 44 in the short-side direction. As shown in FIG. 7 , in this embodiment, the auxiliary member 30e is connected to the center of the tying member 30c in the short-side direction and the center of the tying member 30d in the short-side direction in the support unit 14 in the first state. The same applies to the second support unit 32.

[0051] As shown in Fig. 10, the third support portion 34 is supported by the first support portion 30 and the second support portion 32 at the center in the long side direction, and also supports the center of the work platform 12. In this embodiment, the third support portion 34 supports the first platform portion 20 and the second platform portion 22 so that they can rotate around a rotation axis extending in the short side direction. Specifically, as shown in Fig. 12, the first platform portion 20 and the second platform portion 22 can be rotated approximately 90 degrees outward in the long side direction. This allows the work platform 10 to be folded compactly when stored.

[0052] (Action and effect) As shown in Figures 4, 5, 13, and 14, in the workbench 10 according to this embodiment, the height of the work floor 12 can be adjusted by adjusting the height of the second members 40b, 44b relative to the first members 40a, 44a. In this embodiment, as shown in Figures 5 and 14, an auxiliary member 30e that is expandable and contractible in the vertical direction is provided to connect the connecting member 30c and the connecting member 30d. The auxiliary member 30e expands and contracts in conjunction with the movement of the second members 40b, 44b when the second members 40b, 44b are moved in the vertical direction relative to the first members 40a, 44a. The auxiliary member 30e is also provided at an intermediate position between the support columns 40 and 44 in the short-side direction.

[0053] With the above-described configuration, in the workbench 10 according to this embodiment, the auxiliary member 30e can function as a guide mechanism for moving the second members 40b, 44b parallel to the vertical direction. This prevents the second members 40b, 44b from tilting, allowing the second members 40b, 44b to move evenly in the vertical direction. As a result, the height of the work platform 12 can be smoothly adjusted.

[0054] In particular, in this embodiment, when viewed from the long side direction, the connecting member 30d is attached to the second member 40b and the second member 44b so as to be approximately perpendicular to the second member 40b and the second member 44b. The connecting member 30c is attached to the first member 40a and the first member 44a so as to be approximately perpendicular to the first member 40a and the first member 44a. Furthermore, the auxiliary member 30e is attached to the connecting members 30c and the connecting members 30d so as to be approximately perpendicular to the connecting members 30c and the connecting members 30d. These configurations sufficiently prevent one of the second members 40b, 44b from tilting relative to the other. As a result, the second members 40b, 44b can be moved more evenly in the vertical direction.

[0055] Furthermore, in the workbench 10 according to this embodiment, both ends of the connecting member 30d are attached to the support columns 40, 44 (second members 40b, 44b) so as to be able to swing up and down. In this case, for example, even if the second member 40b tilts relative to the first member 40a when the second members 40b, 44b are moved up and down, the connecting member 30d swings up and down, thereby preventing the second member 44b from tilting relative to the first member 44a. Thus, in this embodiment, the connecting member 30d swings up and down relative to the support columns 40, 44, preventing one of the second members 40b, 44b from tilting in conjunction with the tilt of the other. This prevents a large force from being applied between the first members 40a, 44a and the second members 40b, 44b, allowing the second members 40b, 44b to move up and down smoothly. As a result, the height of the work platform 12 can be adjusted more smoothly.

[0056] In the workbench 10 according to this embodiment, the first auxiliary member 54 is hollow, and the second auxiliary member 56 is inserted into the first auxiliary member 54 so as to be able to move vertically along the inner surface of the first auxiliary member 54. In this case, when the second auxiliary member 56 moves vertically in conjunction with the vertical movement of the second members 40b and 44b, the second auxiliary member 56 comes into contact with the inner surface of the first auxiliary member 54, preventing the second auxiliary member 56 from tilting. This sufficiently prevents the second members 40b and 44b from tilting, further facilitating smooth height adjustment of the work platform 12. Note that the above-described effects can be achieved if at least one of the first and second auxiliary members is hollow and the other of the first and second auxiliary members is inserted into one of the first and second auxiliary members. Therefore, the first auxiliary member 54 may be inserted into the second auxiliary member 56.

[0057] In addition, in the workbench 10 according to this embodiment, both ends of the connecting member 30c are also attached to the support columns 40, 44 (first members 40a, 44a) so that they can swing up and down. In this case, the first auxiliary member 54 and the second auxiliary member 56 are each allowed to tilt to a certain extent. As a result, even if one of the first auxiliary member 54 and the second auxiliary member 56 tilts, the other of the first auxiliary member 54 and the second auxiliary member 56 can be tilted accordingly. As a result, it is possible to avoid application of a large force between the first auxiliary member 54 and the second auxiliary member 56, allowing the auxiliary member 30e to be smoothly extended and retracted. This allows for smooth adjustment of the height of the work platform 12.

[0058] Furthermore, in the workbench 10 according to this embodiment, the auxiliary member 30e is provided inside the connecting members 30c and 30d in the long side direction. In this case, it is possible to prevent the long side dimension of the workbench 10 from becoming large. Furthermore, the auxiliary member 30e does not get in the way when working or moving the workbench 10.

[0059] (Variation) In the above-described embodiment, the first auxiliary member 54 and the second auxiliary member 56 have a cylindrical shape, but the shapes of the first auxiliary member 54 and the second auxiliary member 56 are not limited to the above-described example. Fig. 15 is a diagram showing other examples of the first auxiliary member 54 and the second auxiliary member 56.

[0060] For example, as shown in FIG. 15(a), the first auxiliary member 54 and the second auxiliary member 56 may have a rectangular cylindrical shape. Also, as shown in FIG. 15(b), a first auxiliary member 54 having a shape with a part of the side open may be used. For example, a lip channel steel may be used as the first auxiliary member 54. Also, the first auxiliary member 54 may be made up of multiple members. For example, as shown in FIG. 15(c), the first auxiliary member 54 may be made up by welding a steel plate to a channel steel.

[0061] As described above, the first auxiliary member 54 and the second auxiliary member 56 may be configured so that the first auxiliary member 54 is inserted into the second auxiliary member 56. In this case, the first auxiliary member 54 and the second auxiliary member 56 may have various shapes, as in the above example. Preferably, the first auxiliary member 54 and the second auxiliary member 56 are configured so that the first auxiliary member 54 and the second auxiliary member 56 cannot move horizontally relative to each other.

[0062] In the above-described embodiment, the auxiliary member 30e is configured to expand and contract in the vertical direction due to the force applied by the connecting member 30d, but the workbench 10 may further include a biasing member that applies a force to the auxiliary member 30e in a direction that extends the auxiliary member 30e in the vertical direction. In this case, by utilizing the force applied to the auxiliary member 30e from the biasing member, the second members 40b, 44b can be moved more smoothly in the vertical direction.

[0063] For example, as shown in FIG. 16, the workbench 10 may include, as the biasing member, a gas spring 78 attached to the auxiliary member 30e so as to extend vertically along the auxiliary member 30e. In the example shown in FIG. 16, the gas spring 78 is provided inside the auxiliary member 30e. Specifically, the gas spring 78 includes a cylinder tube 78a extending vertically and a piston rod 78b supported by the cylinder tube 78a so as to be movable vertically relative to the cylinder tube 78a. In this embodiment, the upper end of the cylinder tube 78a is fixed to the upper end of the second auxiliary member 56, and the lower end of the piston rod 78b is fixed to the lower end of the first auxiliary member 54. The piston rod 78b is biased in a direction away from the cylinder tube 78a by the cylinder tube 78a (more specifically, by the gas contained in the cylinder tube 78a). As a result, a force biasing the first auxiliary member 54 and the second auxiliary member 56 in directions away from each other is applied from the gas spring 78 to the auxiliary member 30e.

[0064] Although detailed description is omitted, the biasing member may be composed of multiple gas springs, or may be provided on the outside of the auxiliary member 30e, or may be an elastic member such as a coil spring.

[0065] In the above embodiment, the first support portion 30 and the second support portion 32 each have an auxiliary member 30e, but one of the first support portion 30 and the second support portion 32 may not have an auxiliary member 30e.

[0066] In the above-described embodiment, the present invention is applied to a workbench having a support portion that is extendable in the longitudinal direction. However, the configuration of the workbench to which the present invention is applied is not limited to the above-described embodiment. For example, the present invention may be applied to the workbench 100 illustrated in FIGS. 1 to 3. Specifically, an auxiliary member 30e may be provided to connect the tethers 110a and 110b. In this case, the pair of legs 104, the pair of tethers 110a, and the pair of tethers 110b correspond to the support portions, the pair of support posts 106 and the tethers 110a and 110b provided on one side in the longitudinal direction correspond to the first support portions, the pair of support posts 106 and the tethers 110a and 110b provided on the other side in the longitudinal direction correspond to the second support portions, the tether 110a corresponds to the first tether, and the tether 110b corresponds to the second tether. [Industrial Applicability]

[0067] With the workbench according to the present invention, the height of the work floor can be smoothly adjusted. [Explanation of symbols]

[0068] 10,100 workbench 12,102 work floor 14 Support part 18 Caster 30 1st support part 30c, 110a Tie material (first tie material) 30d, 110b Tie material (second tie material) 30e Auxiliary parts 32 Second support part 40,44,106 Post 40a, 44a, 106a First member 40b, 44b, 106b Second member 54 First auxiliary member 56 Second auxiliary member 78 Gas spring (biasing member)

Claims

1. A work floor and a support portion that supports the work floor, The support portion is a first support portion that supports the work floor on one side in the long side direction of the work floor; a second support portion that supports the work floor on the other side in the long side direction, The first support portion and the second support portion each include: A pair of support columns provided apart in the short side direction of the work floor; a first connecting member and a second connecting member extending in the short side direction and spaced apart in the up-down direction so as to connect the pair of support columns; Each of the pair of support columns is a first member extending in the vertical direction; a second member extending above the first member and supported by the first member so as to be movable in the up and down direction relative to the first member; the first connecting member connects the first members of the pair of columns together; the second connecting member connects the second members of the pair of columns above the first connecting member, A workbench, wherein at least one of the first support portion and the second support portion has an auxiliary member that extends vertically at an intermediate position between the pair of pillars in the short side direction to connect the first connecting member and the second connecting member, and is expandable and contractible in the vertical direction.

2. The workbench according to claim 1 , wherein one end and the other end of the second connecting member in the short side direction are attached to the support column so as to be able to swing up and down relative to the support column.

3. the auxiliary member includes a first auxiliary member extending in the vertical direction and fixed to the first connecting member, and a second auxiliary member extending in the vertical direction and fixed to the second connecting member, 3. A workbench as described in claim 1 or 2, wherein the second auxiliary member is connected to the first auxiliary member so that it can move vertically relative to the first auxiliary member and so that horizontal movement relative to the first auxiliary member is restricted.

4. At least one of the first auxiliary member and the second auxiliary member has a hollow shape, The workbench according to claim 3 , wherein the other of the first auxiliary member and the second auxiliary member is inserted into the one of the first auxiliary member and the second auxiliary member.

5. The workbench according to claim 1 or 2, further comprising a biasing member that applies a force to the auxiliary member in a direction that stretches the auxiliary member vertically.

6. The support portion is configured to be extendable and contractible so as to be set between a first state in which the first support portion and the second support portion support the four corners of the work floor, and a second state in which the length in the long side direction is shorter and the length in the short side direction is longer than in the first state, The first connecting member and the second connecting member are each configured to be expandable and contractible in the short side direction, one end and the other end of the first connecting member in the short side direction are attached to the support pillar so as to be able to swing horizontally relative to the support pillar, The workbench according to claim 1 or 2, wherein one end and the other end of the second connecting member in the short side direction are attached to the support column so as to be able to swing horizontally relative to the support column.

7. The workbench of claim 6, wherein the auxiliary member is connected to a position that is the center of the short side direction of the first connecting member in the first state and a position that is the center of the short side direction of the second connecting member in the first state.

8. The workbench according to claim 1 or 2, wherein the auxiliary member is provided on the inner side of the first connecting member and the second connecting member in the long side direction.

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