Mobile workbench

Abstract

To provide a mobile workbench that can improve the degree of freedom in installation. [Solution] The mobile workbench 100 is equipped with a top plate portion 110 and legs 130 connected to the underside of the top plate portion 110, and is characterized in that the legs 130 are inclined relative to the vertical direction and are positioned so that their upper and lower ends overlap the top plate portion 110 when viewed from above the mobile workbench 100.

Description

[Technical Field]

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

[0002] Mobile work platforms for working at heights have been known for some time. Mobile work platforms can be moved to any position. Patent Document 1 discloses a portable work platform that includes a top plate and a pair of legs. With such a portable work platform, a worker can ascend and descend between the top plate and the floor using the ladder-like legs. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-84944 Summary of the Invention [Problem to be solved by the invention]

[0004] Book The invention Make people aware that the cross members are movable The purpose is to: [Means for solving the problem]

[0005] The mobile work platform of the present invention is a mobile work platform comprising a top panel portion and legs connected to the underside of the top panel portion and extending from the top panel portion toward a floor surface, wherein the legs have four leg members, each of which has a main leg and an extendable leg that extends or shortens the length of the leg member by gradually changing the length that protrudes from the lower end of the main leg, and wherein, assuming that the four leg members are respectively a first leg member, a second leg member, a third leg member, and a fourth leg member, the legs have: Multiple, separated vertically,a first horizontal member that is bridged between the telescopic legs of the first leg member and the telescopic legs of the second leg member, and a second horizontal member that is bridged between the telescopic legs of the third leg member and the telescopic legs of the fourth leg member, multiple The color of the first horizontal member and the color of the second horizontal member are different colors. The color of each of the first horizontal members is silver, and the color of the second horizontal member is gold. It is characterized by: [Effects of the Invention]

[0006] According to the present invention, Recognize that the cross member is movable can. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a diagram illustrating an example of the configuration of a workbench system according to a first embodiment. [Figure 2] FIG. 2 is a plan view showing an example of the configuration of a workbench. [Figure 3] FIG. 2 is a front view showing an example of the configuration of a workbench. [Figure 4] FIG. 2 is a side view showing an example of the configuration of a workbench. [Figure 5] FIG. 2 is an exploded perspective view showing an example of the configuration of a workbench. [Figure 6] FIG. 2 is a perspective view showing an example of a configuration around a top plate portion. [Figure 7] FIG. 2 is a cross-sectional view showing an example of the configuration of a top plate portion. [Figure 8A] 10A and 10B are diagrams illustrating an example of the configuration of a rotation unit in a spread-leg state. [Figure 8B] 10A and 10B are diagrams illustrating an example of the configuration of a rotation unit in a closed-leg state. [Figure 9A] 10A and 10B are diagrams illustrating an example of the configuration of a rotation unit in a spread-leg state. [Figure 9B] 10A and 10B are diagrams illustrating an example of the configuration of a rotation unit in a closed-leg state. [Figure 10] FIG. 2 is a perspective view showing an example of the configuration of a caster. [Figure 11] FIG. 2 is a perspective view showing an example of the configuration of a caster. [Figure 12] FIG. 4 is a perspective view showing an example of the configuration of a stay portion. [Figure 13] FIG. 10 is a diagram showing an example of a state in which the legs are folded. [Figure 14] 10A and 10B are diagrams illustrating an example of positions where leg members and casters are arranged. [Figure 15] FIG. 10 is a perspective view showing an example of the configuration of a caster according to a second embodiment. [Figure 16] 10A and 10B are diagrams illustrating an example of the configuration of a conversion member according to a third embodiment. [Figure 17] 10A and 10B are diagrams for explaining the function of a conversion member. [Figure 18] FIG. 13 illustrates an example of a bridge configuration according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, the mobile workbench according to this embodiment will be described with reference to the drawings. (First embodiment) The mobile work platform 100 is a work platform for a worker to work at height. The mobile work platform 100 (work platform 100) of this embodiment is assumed to have a height from the floor surface to a top plate portion 110 (described later) of, for example, approximately 1000 mm to approximately 1500 mm. The workbench 100 can be used by a worker individually, or a plurality of workbenches 100 can be connected together to form a workbench system 10. First, the configuration of the workbench system 10 will be described.

[0009] FIG. 1 is a diagram showing an example of the configuration of a workbench system 10. As shown in FIG. The workbench system 10 of this embodiment includes workbenches 100 (100a, 100b), bridges 20 (20a to 20c), auxiliary handrail sections 30 (30a, 30b), and the like. The work platforms 100a and 100b are installed in parallel, facing the same direction and at a distance from each other. The bridges 20 (20a to 20c) are arranged between the long side end of the work platform 100a and the long side end of the work platform 100b. The bridges 20 function as a so-called scaffold. In other words, there are no support members for the bridges 20 between the bridges 20 and the floor; the work platforms 100a and 100b support the bridges 20. Here, the three bridges 20a to 20c are arranged in parallel with no gaps. The auxiliary handrail units 30 are attached to the work platform 100 or the bridges 20 as needed to surround the work area. When a worker works in the work area, the worker can recognize the end of the work area by contacting part of the worker's body with the auxiliary handrail units 30. Here, an auxiliary handrail section 30a is arranged which approximately matches the short-side length of the work platform 100, and an auxiliary handrail section 30b is arranged which approximately matches the long-side length of the work platform 100 or the long-side length of the bridge 20.

[0010] In the workbench system 10, a wide work area can be secured by connecting multiple workbenches 100 or connecting them with bridges 20. Therefore, workers do not need to move the workbench 100 when working in different locations. Furthermore, multiple workers can work simultaneously. In this way, working using the workbench system 10 can improve work efficiency. Note that the configuration of the workbench system 10 is not limited to the configuration of the workbench system 10 shown in FIG. 1 , and the number and positions of the workbenches 100 and bridges 20 can be changed depending on the work site. For example, the bridges 20 may be arranged between the short-side ends of the workbench 100 and the short-side ends of the workbench 100, or between the short-side ends of the workbench 100 and the long-side ends of the workbench 100. Furthermore, the bridges 20 are available in various lengths, such as 500 mm, 1000 mm, 1500 mm, 2000 mm, and 2500 mm, and bridges 20 of any length may be used. Furthermore, for example, a different workbench 100c, shown by the two-dot chain line, may be installed adjacent to the workbench 100b without using the bridge 20.

[0011] Next, the stand-alone workbench 100 will be described. Fig. 2 is a plan view showing an example of the configuration of workbench 100. Fig. 3 is a front view showing an example of the configuration of workbench 100. Fig. 4 is a side view showing an example of the configuration of workbench 100. Fig. 5 is an exploded perspective view showing an example of the configuration of workbench 100. For ease of explanation, in each figure, the front side is indicated as Fr, the rear side as Rr, the right side as R, and the left side as L, as necessary. The workbench 100 has a top panel 110, legs 130, a rotating section 150, a running section 180, and a rotation restricting section 220. The top panel 110 functions as a foothold for workers working at height. When viewed from above, the top panel 110 has a rectangular shape that is long in the front-to-rear direction. The length in the front-to-rear direction is, for example, approximately 1500 mm, and the length in the left-to-right direction is, for example, approximately 1000 mm. The top panel 110 is formed by connecting a plurality of long top panel members. Specifically, the top panel 110 is formed by connecting a plurality of (for example, four) long longitudinal members 111a to 111d aligned side by side in the front-to-rear direction, and then sandwiching the longitudinal members 111a to 111d between short members 112a and 112b from the front and rear, and fastening them together using bolts or rivets. Note that rivets include blind rivets. The longitudinal members 111a to 111d and the short members 112a and 112b are made of, for example, an aluminum alloy and formed by extrusion molding. The longitudinal members 111a to 111d and the short members 112a and 112b are, for example, a metallic color such as silver.

[0012] Fig. 6 is a perspective view showing an example of the configuration of a portion of the top panel 110 and the configuration around the top panel 110. As shown in Fig. 6, the top panel 110 has a plurality of protrusions 113 on its upper surface, which serves as a work surface, to prevent slipping. The protrusions 113 are formed at intervals across the entire surface of the top panel 110. The protrusions 113 protrude upward and have a hole in the center.

[0013] The top panel 110 also has multiple connecting members 114 located near the four corners. The connecting members 114 are members that connect to other adjacent work tables 100. Here, as shown by the two-dot chain line in FIG. 6 , the connecting members 114 are bar-shaped and bent into a U-shape. The connecting member 114 has a base shaft 115, a gripping portion 116, and a connecting shaft 117. The base shaft 115 is an axis extending vertically from one end of the gripping portion 116 and is biased in a direction to be accommodated in the top panel 110. The gripping portion 116 is an axis extending horizontally and is gripped by an operator when lifting the connecting member 114. The connecting shaft 117 is an axis extending vertically from the other end of the gripping portion 116 and connects the top panel 110 to other work tables 100. As shown by the solid line in FIG. 6 , when there is no workbench 100 to connect to, the base shaft 115 and connecting shaft 117 of the connecting member 114 are housed inside the top plate 110. On the other hand, to connect the connecting member 114 to another workbench 100, the worker pulls up the grip portion 116 to expose the lower end of the connecting shaft 117. Next, as shown by the two-dot chain line in FIG. 6 , the worker rotates the connecting member 114 about the base shaft 115, thereby positioning the connecting shaft 117 outside the outer periphery of the top plate 110. Next, the worker can connect the other workbench 100 by inserting the connecting shaft 117 from above into a connecting hole 118 (described later) of the other workbench 100.

[0014] The top panel 110 also has a plurality of connecting holes 118 as connecting portions at positions close to the outer periphery. The connecting holes 118 are holes for connecting to the bridge 20 or another adjacent work table 100. Here, the bridge 20 will be described with reference to Figure 6. The bridge 20 has connecting pins 22 as connecting parts at the end on the side that connects to the workbench 100. The connecting pins 22 protrude downward from brackets 21 located on both sides of the end of the bridge 20. The bridge 20 is connected to the workbench 100 by inserting the two connecting pins 22 into the connecting holes 118 from above. For example, six connecting holes 118 are formed in each of the long member 111a and the long member 111d, and four connecting holes 118 are formed in each of the short member 112a and the short member 112b (see FIG. 2). Therefore, three bridges 20 can be connected in parallel to the long end of the top plate 110, and two bridges 20 can be connected in parallel to the short end of the top plate 110.

[0015] The connecting hole 118 of this embodiment is configured by placing a tubular member 120 in an opening hole 119 formed in the top plate portion 110. 7(a) is a cross-sectional view taken along line II in FIG. 6 and viewed from the direction of the arrow. The tubular member 120 reinforces the opening 119 formed in the top plate portion 110. The tubular member 120 is made of, for example, iron, and is made of a material harder than the top plate members (the long members 111a to 111d and the short members 112a and 112b) of the top plate portion 110. The tubular member 120 has a so-called eyelet shape and includes a tubular portion 121, an upper flange portion 122, and a lower flange portion 123. The internal space of the tubular portion 121 forms the above-mentioned connecting hole 118. The tubular portion 121 covers the opening edge of the opening 119 from the inside. The upper flange portion 122 covers the opening edge of the opening 119 from above, and the lower flange portion 123 covers the opening edge of the opening 119 from below. The connecting hole 118 is inserted each time the connecting pin 22 of the bridge 20 or the connecting shaft 117 of the connecting member 114 is connected, and after connection, a force is applied in the direction of widening the hole diameter. In this embodiment, by forming the connecting hole 118 using the tubular member 120, deformation of the connecting hole 118 can be suppressed. Furthermore, if the connecting hole 118 is deformed, it can be easily repaired by replacing the tubular member 120. The tubular member 120 covers the opening edge of the opening hole 119 from at least one of the inside and the top, thereby suppressing deformation. When attaching the tubular member 120 to the opening hole 119, the tubular member 120, which does not have the lower flange portion 123, can be attached by inserting the tubular member 120, which does not have the lower flange portion 123, into the opening hole 119 from above with the tubular portion 121 at the front, and then crimping the lower side of the tubular portion 121 to form the lower flange portion 123.

[0016] Furthermore, the tubular member 120 is colored a different color from the upper surface of the top plate member of the top plate portion 110. Specifically, the tubular member 120 is colored, for example, red. By coloring the tubular member 120 in this way, the worker can easily recognize the connecting hole 118. Furthermore, since the tubular member 120 is disposed close to the outer periphery of the top plate portion 110, the worker can easily recognize the position of the end of the top plate portion 110 by visually checking the tubular member 120. Note that the tubular member 120 itself need not be colored; the surface of the upper flange portion 122 or the periphery of the connecting hole 118 may be colored by applying paint or by attaching a sticker.

[0017] The top panel 110 also has a plurality of handrail holes 125 at positions close to the outer periphery. The handrail holes 125 are holes for attaching auxiliary handrail portions 30. For example, four handrail holes 125 are formed in each of the long member 111a and the long member 111d, and two are formed in each of the short member 112a and the short member 112b (see FIG. 2). One auxiliary handrail section 30a can be attached to the short end of the top panel section 110, and one auxiliary handrail section 30b can be attached to the long end. Of the four handrail holes 125 formed in the long member 111a and the long member 111d, two can be selected depending on the desired installation position to attach the auxiliary handrail section 30b. The auxiliary handrail section 30 will now be described with reference to Figure 6. The auxiliary handrail section 30 has a handrail main body 31, a post 32, a baseboard 33, a hook member 34, a support member 35, and an insertion pin 38.

[0018] When part of the worker's body comes into contact with the handrail main body 31, the worker is made aware that he or she is at the end of the tabletop 110. The handrail main body 31 is rod-shaped and extends horizontally in parallel with the outer periphery of the tabletop 110. The handrail main body 31 is made of, for example, synthetic resin, which reduces the weight of the auxiliary handrail section 30. The support posts 32 support the handrail main body 31. The support posts 32 are rod-shaped and extend vertically. The support posts 32 are made of, for example, an aluminum alloy. A plurality of support posts 32 (for example, two) are arranged at intervals, and the handrail main body 31 is fixed in a spanning state at the upper ends. By spanning the handrail main body 31 between two support posts 32, the handrail main body 31 is more likely to bend when the worker's body comes into contact with the handrail main body 31 than when the handrail main body 31 is spanned using two or more support posts 32. The baseboard 33 prevents items from falling off the top panel portion 110. The baseboard 33 is made of, for example, an aluminum alloy. The baseboard 33 is fixed below the support posts 32, spanning between the two support posts 32.

[0019] The hooking member 34 is a member for attaching the auxiliary handrail section 30 to the top plate section 110. The hooking member 34 is a plate-like member that extends from the lower end of the support post 32 in a horizontal direction perpendicular to the longitudinal direction of the handrail main body 31 and is then bent so that its tip extends diagonally upward. The hooking member 34 is made of, for example, iron or titanium. The hooking member 34 is fixed to the lower end of the support post 32. When the auxiliary handrail section 30 is attached to the top plate section 110, the tip of the hooking member 34 abuts against the underside of the top plate section 110. The support member 35 is placed on the upper surface of the top plate portion 110. The support member 35 is in the form of a plate bent into an L shape. The support member 35 is made of, for example, iron or titanium. The support member 35 is fixed to the support post 32 at a position above the hook member 34. The support member 35 has a horizontal support portion 36, and a hole 37 is formed in the support portion 36. The hole 37 is an elongated hole that is long along the longitudinal direction of the handrail main body 31. The insertion pin 38 is a pin that is inserted into the hole 37 of the support member 35 and the handrail hole 125. The insertion pin 38 is connected to the support post 32 by, for example, a string-like member so as not to come off.

[0020] Here, the case where the auxiliary handrail portion 30 is attached to the top plate portion 110 will be described. FIG. 7(b) is a cross-sectional view taken along the line II-II in FIG. 6 in the vertical direction and viewed from the direction of the arrow. To attach the auxiliary handrail section 30 to the top panel 110, the worker tilts the underside of the auxiliary handrail section 30 so that it approaches the top panel 110, inserts the tip of the hooking member 34 into the rib 126 formed on the underside of the longitudinal member 111a, hooks it, and then rotates the auxiliary handrail section 30 upright around the tip of the hooking member 34. With the support posts 32 of the auxiliary handrail section 30 aligned vertically, the support sections 36 of the support members 35 are placed on the top surface of the top panel 110. At this time, the holes 37 of the support sections 36 and the handrail holes 125 are vertically connected. The worker then inserts the insertion pins 38 into the holes 37 and the handrail holes 125 to attach the auxiliary handrail section 30 to the top panel 110. Furthermore, since the hole 37 of the support part 36 is a long hole, even if the auxiliary handrail part 30 is slightly misaligned along the outer peripheral edge of the top plate part 110, the hole 37 of the support part 36 and the handrail hole 125 can be connected. In this embodiment, the handrail hole 125 may be formed directly in the top panel portion 110, or a tubular member may be used, as with the connecting hole 118. Note that, because the handrail hole 125 and the connecting hole 118 are to be attached to different objects, it is preferable to color the area around the handrail hole 125 a different color from the tubular member 120 so that workers can distinguish them.

[0021] Next, the legs 130 of the workbench 100 will be described. The legs 130 have the function of supporting the weight of the top panel 110 and the weight of a worker working on the top panel 110. The legs 130 are connected to the underside of the top panel 110 and are rotatable relative to the top panel 110. When the legs 130 rotate, the legs 130 are folded so that they overlap the top panel 110. Specifically, leg portion 130 has four leg members 131a to 131d. Leg members 131a and 131b are located on the rear side in the front-to-rear direction and extend from top plate portion 110 toward the floor. Leg members 131a and 131b are located apart from each other in the left-to-right direction. Leg members 131c and 131d are located on the front side in the front-to-rear direction and extend from top plate portion 110 toward the floor. Leg members 131c and 131d are located apart from each other in the left-to-right direction. Therefore, leg members 131a to 131d extend toward the floor from positions close to the four corners of top plate portion 110, respectively. The leg members 131a to 131d each have a main leg 132 and an extendable leg 133. The main leg 132 is a main component of the leg members 131a to 131d. The main leg 132 is made of, for example, an aluminum alloy and formed by extrusion molding. The main leg 132 has a metallic color such as silver. The main leg 132 is, for example, a hollow or solid component with a substantially rectangular cross section. The main leg 132 has a rotation hole 139 near the upper end (see FIG. 5). A rotation shaft 157, which will be described later, is inserted through the rotation hole 139. The rotation hole 139 of the main legs 132 of the leg members 131a and 131b is located higher than the rotation hole 139 of the main legs 132 of the leg members 131c and 131d.

[0022] The telescopic legs 133 are members that extend and retract the leg members 131a to 131d along the longitudinal direction (see FIG. 3). The telescopic legs 133 fit inside the main legs 132 and are slidable along the longitudinal direction of the main legs 132. The telescopic legs 133 are made of, for example, an aluminum alloy and formed by extrusion molding. The telescopic legs 133 are a metallic color such as silver. The telescopic legs 133 are, for example, hollow or solid members with a substantially rectangular cross section that is a reduced cross section of the main legs 132. The telescopic legs 133 extend and retract the length of the leg members 131a to 131d by changing the length by which they protrude from the bottom ends of the main legs 132. The telescopic legs 133 also have stopper members 134 at their bottom ends. The stopper members 134 prevent the bottom ends of the telescopic legs 133 from entering the main legs 132. The stopper members 134 are made of, for example, an aluminum alloy and formed by extrusion molding. The stopper member 134 is, for example, a metallic color such as silver. The stopper member 134 is, for example, a hollow or solid member with a substantially rectangular cross section, and can be made of the same material as the main leg 132. The stopper member 134 is fitted onto the outer periphery of the lower end of the telescopic leg 133 and fixed using bolts, rivets, or the like. The height of the tabletop 110 can be adjusted by extending and retracting the leg members 131a to 131d using the extendable legs 133. The height of the legs 130 can be adjusted in steps, for example, from 0 mm to 400 mm at intervals of approximately 50 mm or approximately 100 mm.

[0023] Furthermore, main leg 132 has locking mechanism 135 (see FIG. 4). Locking mechanism 135 locks in stages the length that telescopic leg 133 projects from the bottom end of main leg 132. Locking mechanisms 135 are attached to positions below the center of each main leg 132, on the side where leg member 131a and leg member 131b face each other and on the side where leg member 131c and leg member 131d face each other.

[0024] Furthermore, horizontal bridge members 137a and 137b are provided between leg members 131a and 131b, and between leg members 131c and 131d. The horizontal bridge members 137a and 137b are members that improve the rigidity of leg members 131a to 131d. 4, a plurality of cross members 137a, 137b are spanned between leg member 131a and leg member 131b at intervals in the vertical direction. Specifically, three cross members 137a are arranged between the main leg 132 of leg member 131a and the main leg 132 of leg member 131b, and one cross member 137b is arranged between the telescopic leg 133 of leg member 131a and the telescopic leg 133 of leg member 131b. The cross member 137a is fixed to the main leg 132 via a bracket using bolts, rivets, etc. Meanwhile, the cross member 137b is fixed to the stopper member 134 of the telescopic leg 133 via a bracket using bolts, rivets, etc.

[0025] The cross members 137a and 137b are made of, for example, an aluminum alloy and formed by extrusion molding. The cross members 137a and 137b are, for example, hollow or solid members with a substantially rectangular or polygonal cross section. The cross members 137a and 137b are different colors. The cross member 137a is a metallic color such as silver, and the cross member 137b is a gold color. The cross member 137b is colored, for example, during an anodizing process. The cross member 137b is a different color from the cross member 137a to alert the operator that the cross member 137b is movable. In other words, because the cross member 137b is fixed to the telescopic leg 133, the length by which the telescopic leg 133 protrudes from the main leg 132 can be changed by vertically moving the cross member 137b.

[0026] Furthermore, of the multiple cross members 137a spanning between the leg members 131a and 131b, an abutment member 138 is fixed to the uppermost cross member 137a. When the legs 130 are folded, the abutment member 138 comes into contact with the floor or the top plate portions 110 of other stacked work tables 100, thereby maintaining the top plate portions 110 of the stacked work tables 100 horizontal. The abutment member 138 is made of, for example, an aluminum alloy and is formed by extrusion molding. The abutment member 138 has a metallic color such as silver. The abutment member 138 is, for example, a hollow or solid member with a substantially rectangular cross section. Although the description has been given here of the cross members 137a and 137b that are bridged between leg members 131a and 131b, cross members 137a and 137b with a similar configuration and at a similar height are also bridged between leg members 131c and 131d. However, cross member 137a that is bridged between leg members 131c and 131d does not have the above-mentioned abutment member 138.

[0027] In this way, by bridging the cross members 137a and 137b between the leg members 131a and 131b and between the leg members 131c and 131d, the leg members 131a and 131b are configured as one unit, i.e., the first leg body 140A, and the leg members 131c and 131d are configured as one unit, i.e., the second leg body 140B. The leg portion 130 is arranged so that the pair of leg bodies 140A and 140B face each other in the front-to-rear direction.

[0028] Next, the rotating part 150 will be described. The pivoting unit 150 has a function of pivoting the leg unit 130 relative to the top panel 110. By pivoting the leg unit 130 relative to the top panel 110 via the pivoting unit 150, the leg unit 130 changes into an open-leg posture in which the leg unit 130 extends downward, and a closed-leg posture in which the leg unit 130 overlaps the top panel 110 and is folded. Specifically, the rotating section 150 has four rotating bodies 151a to 151d (see FIG. 5). The rotating bodies 151a to 151d are disposed between the leg members 131a to 131d and the top panel section 110, respectively. That is, the rotating bodies 151a to 151d are positioned close to the four corners of the top panel section 110, respectively. First, the rotating body 151a will be described. The rotating body 151a and the rotating body 151b are configured to be substantially symmetrical with each other.

[0029] Fig. 8A(a) is a cross-sectional view showing the configuration around the rotating body 151a as seen from the left and right in the legs-spread state. Fig. 8A(b) is a cross-sectional view showing the configuration around the rotating body 151a as seen from the front and back in the legs-spread state. The rotating body 151a has a rotation support member 152a, a rotation shaft 157, and a stopper mechanism 160a. The rotation support member 152a is a member that supports the rotation of the leg member 131a. The rotation support member 152a is made of, for example, iron or titanium, and is formed by bending a plate. The rotation support member 152a is, for example, a metallic color such as silver. The pivot support member 152a has an upper plate 153 and a pair of support plates 154a, and is generally U-shaped when viewed from the front-to-rear direction. The upper plate 153 is secured to the underside of the top plate portion 110 with a reinforcing plate 158 interposed therebetween using bolts, rivets, or the like. The pair of support plates 154a hang down from the left and right ends of the upper plate 153, respectively. The support plate 154a has support holes 155a into which the pivot shaft 157 is inserted. The inner one of the pair of support plates 154a has a stopper hole 156 into which a stopper member 165, described below, is inserted. Note that the pivot support member 152a may be formed with ribs that are uneven in the plate thickness direction as appropriate to improve rigidity. The pivot shaft 157 is a member that serves as the center of rotation when the leg member 131a rotates. The pivot shaft 157 is inserted through the support hole 155a of the support plate 154a and the pivot hole 139 of the main leg 132. The pivot shaft 157 is, for example, a bolt, and is attached by screwing a nut so that it does not come off. In this way, the rotating body 151a supports the rotation of the leg member 131a by the pivot shaft 157 that is supported by the rotation support member 152a.

[0030] The stopper mechanism 160a is a mechanism for holding the leg members 131a in either the open leg state or the closed leg state. The stopper mechanism 160a is provided inside the top panel 110. The stopper mechanism 160 a includes a rotating member 161 a , a stopper member 165 , a biasing member 168 , and a lever portion 167 . The rotating member 161a is a member that engages with the stopper member 165. The rotating member 161a is made of, for example, iron or titanium and is generally plate-shaped. The rotating member 161a is a metallic color, for example, silver. The rotating member 161a is located near the upper end of the main leg 132 and is fixed to the side surface of the leg member 131a (the side surface facing the leg member 131b) using bolts, rivets, or the like. The rotating member 161a also has a communication hole 162a that communicates with the rotation hole 139, a first engagement hole 163a, and a second engagement hole 164a. The first engagement hole 163a is located at the top of the rotating member 161a, and the second engagement hole 164a is located at the front of the rotating member 161a. The distance from the communication hole 162a to the first engagement hole 163a and the distance from the communication hole 162a to the second engagement hole 164a are the same. When the pivoting member 161a is fixed to the side surface of the leg member 131a, the first engagement hole 163a and the second engagement hole 164a are positioned so as not to overlap with the leg member 131a when viewed from the left and right. Note that the first engagement hole 163a and the second engagement hole 164a are not limited to being through holes, but may also be bottomed holes. Furthermore, the pivoting member 161a may be appropriately formed with ribs that are uneven in the plate thickness direction to improve rigidity.

[0031] The stopper member 165 is a member that engages with the first engagement hole 163a or the second engagement hole 164a of the rotating member 161a. The stopper member 165 is made of, for example, iron and is generally bar-shaped. The stopper member 165 is metallic, for example, silver, and is disposed inside the top plate 110 along the left-right direction. At this time, the stopper member 165 penetrates the ribs 126 of the longitudinal members 111a and 111b and is slidable along the left-right direction via the ribs 126. Specifically, the stopper member 165 has an engagement portion 166 and a lever portion 167. The engagement portion 166 is located at the tip of the stopper member 165 and engages with the rotating member 161a by being inserted into either the first engagement hole 163a or the second engagement hole 164a. The lever portion 167 is located opposite the engaging portion 166 and near the approximate center of the top panel 110 in the left-right direction. The lever portion 167 extends in a direction approximately perpendicular to the left-right direction. A biasing member 168 disposed between the engaging portion 166 and the lever portion 167 constantly biases the engaging portion 166 toward the rotating member 161a. The biasing member 168 is, for example, a coil spring, and is disposed between the intermediate position of the stopper member 165 and the rib 126 of the longitudinal member 111b. The lever portion 167 is a portion where an operator slides the stopper member 165 in the left-right direction against the biasing force of the biasing member 168 to release the engagement by the engaging portion 166. Here, the outer periphery of the lever portion 167 is covered by an operating lever 170. Therefore, in practice, the operator operates the operating lever 170 to release the engagement by the engaging portion 166.

[0032] The operating lever 170 is made of, for example, a synthetic resin. The operating lever 170 is colored a different color from the stopper member 165. The operating lever 170 is colored a different color from the top plate member of the top plate portion 110. Specifically, the operating lever 170 is colored, for example, blue. The operating lever 170 is colored, for example, by mixing a colorant into a resin material and then injection molding it. The operating lever 170 also has a plurality of anti-slip ribs 171 that protrude in an annular shape in the radial direction from the outer circumferential surface. The operating lever 170 is positioned so as to be exposed from the underside of the top plate portion 110 when viewed from the front-to-rear direction. In this way, by covering lever portion 167 with operating lever 170, the diameter of the portion to be gripped becomes larger, allowing the operator to easily perform the operation to release the engagement. Also, by coloring operating lever 170, the operator can easily recognize operating lever 170.

[0033] Here, with reference to FIGS. 8A and 8B, the operation of leg member 131a when it rotates from the open leg state to the closed leg state will be described. Fig. 8B(a) is a cross-sectional view showing the configuration around the rotating body 151a as viewed from the left and right in the closed-leg state. Fig. 8B(b) is a cross-sectional view showing the configuration around the rotating body 151a as viewed from the front and back in the closed-leg state. First, from the state shown in FIG. 8A , the operator operates the operating lever 170 against the biasing force of the biasing member 168 to slide the stopper member 165 in the left-right direction. When the stopper member 165 slides, the engagement portion 166 of the stopper member 165 disengages from the first engagement hole 163a of the rotating member 161a, and the engagement between the stopper member 165 and the rotating member 161a is released. In this state, the leg member 131a can be rotated relative to the top plate 110. The operator rotates the leg member 131a around the rotation shaft 157 of the rotating body 151a in a direction that overlaps with the top plate 110. While the leg member 131a is being rotated, the rotation member 161a also rotates in conjunction with the rotation of the leg member 131a. While leg member 131a is rotating, the operator releases operating lever 170, causing engagement portion 166 of stopper member 165 to come into contact with the surface of rotating member 161a due to the biasing force of biasing member 168. Therefore, rotating member 161a rotates while abutting engagement portion 166 of stopper member 165.

[0034] As shown in FIG. 8B, when leg member 131a rotates until it is substantially parallel to top panel 110, second engagement hole 164a of pivoting member 161a communicates with stopper hole 156. Therefore, engagement portion 166 of stopper member 165 is inserted into second engagement hole 164a by the biasing force of biasing member 168, and stopper member 165 engages with pivoting member 161a. In this way, leg member 131a is maintained in a closed-leg state. Note that leg member 131a can be shifted from the closed-leg state to the open-leg state by releasing the engagement between stopper member 165 and pivoting member 161a. Here, the description has been given for leg member 131a, but leg member 131a and leg member 131b are one unit, so leg member 131b also rotates in the same manner. Note that operation lever 170 for disengaging rotation member 161a fixed to leg member 131a from stopper member 165, and operation lever 170 for disengaging rotation member 161a fixed to leg member 131b from stopper member 165, are positioned adjacent to each other in the center of the tabletop 110 in the left-right direction. Therefore, an operator can release the engagement on either leg member 131a or leg member 131b by gripping the two operation levers 170 with one hand.

[0035] Next, rotating body 151c will be described. Since rotating body 151c and rotating body 151d have approximately bilaterally symmetrical configurations, the following description will focus on rotating body 151c. Furthermore, the description of rotating body 151c will focus on differences from rotating body 151a, and similar configurations will be given the same reference numerals and descriptions thereof will be omitted as appropriate. Fig. 9A(a) is a cross-sectional view showing the configuration around the rotating body 151c as viewed from the left and right in the legs-spread state. Fig. 9A(b) is a cross-sectional view showing the configuration around the rotating body 151c as viewed from the front and back in the legs-spread state. The rotating body 151c has a rotation support member 152c, a rotation shaft 157, and a stopper mechanism 160c. The rotation support member 152c is a member that supports the rotation of the leg member 131c. The rotation support member 152c is made of, for example, iron or titanium, and is formed by bending a plate. The rotation support member 152c is, for example, a metallic color such as silver. The pivot support member 152c has an upper plate 153 and a pair of support plates 154c, and is generally U-shaped when viewed from the front-to-rear direction. The pair of support plates 154c hang further downward than the support plate 154a described above. The support plate 154c has support holes 155c into which the pivot shaft 157 is inserted. The support holes 155c are located lower than the support holes 155a of the support plate 154a described above. However, the stopper holes 156 are located at the same height as the stopper holes 156 of the support plate 154a described above. Note that the pivot support member 152c may be formed with ribs that are uneven in the plate thickness direction as appropriate to improve rigidity.

[0036] The rotating body 151c supports the rotation of the leg member 131c by means of a rotation shaft 157 supported by a rotation support member 152c. However, since the support hole 155c is located lower than the support hole 155a described above, the rotating body 151c supports the rotation of the leg member 131c at a position lower than the rotating body 151a. The reason why the position at which the leg member 131c is rotated is set lower in this way is because the leg member 131c does not directly overlap the tabletop 110 but overlaps with the leg member 131a in the closed-leg posture via the tabletop 110. That is, in the closed-leg posture, the tabletop 110, the leg member 131a, and the leg member 131c overlap in this order, and the rotating position is offset downward by approximately the thickness of the leg member 131a in the front-to-rear direction to keep the leg member 131c in the closed-leg posture horizontal.

[0037] The stopper mechanism 160c includes a rotating member 161c, a stopper member 165, a biasing member 168, and a lever portion 167. The rotating member 161c is a member that engages with the stopper member 165. The rotating member 161c is made of, for example, iron or titanium and is generally plate-shaped. The rotating member 161c is a metallic color such as silver. The rotating member 161c is located near the upper end of the main leg 132 and is fixed to the side surface of the leg member 131c (the side surface facing the leg member 131d) using bolts, rivets, or the like. The rotating member 161c is fan-shaped and slightly larger than the rotating member 161a described above. The rotating member 161c also has a communication hole 162c that communicates with the rotation hole 139, a first engagement hole 163c, and a second engagement hole 164c. The first engagement hole 163c is located at the top of the rotating member 161c, and the second engagement hole 164c is located at the rear of the rotating member 161b. The distance from the communication hole 162c to the first engagement hole 163c and the distance from the second engagement hole 164c to the communication hole 162c are the same, but are longer than those of the pivoting member 161a. When the pivoting member 161c is fixed to the side surface of the leg member 131c, the first engagement hole 163c and the second engagement hole 164c are positioned so as not to overlap with the leg member 131c when viewed from the left and right. Note that the first engagement hole 163c and the second engagement hole 164c are not limited to through holes and may be bottomed holes. Furthermore, the pivoting member 161c may be formed with ribs that are uneven in the plate thickness direction as appropriate to improve rigidity. The stopper member 165 is a member that engages with the first engaging hole 163c or the second engaging hole 164c of the rotating member 161c.

[0038] 9A and 9B, the operation of leg member 131c when it rotates from the open leg state to the closed leg state will be described. Note that the description of the same operation as the operation of leg member 131a when it rotates from the open leg state to the closed leg state will be omitted as appropriate. Fig. 9B(a) is a cross-sectional view showing the configuration around the rotating body 151c as viewed from the left and right in the closed-leg state. Fig. 9B(b) is a cross-sectional view showing the configuration around the rotating body 151c as viewed from the front and back in the closed-leg state. 9A, the operator operates operating lever 170 against the biasing force of biasing member 168 to slide stopper member 165 in the left-right direction. When stopper member 165 slides, engaging portion 166 of stopper member 165 disengages from first engaging hole 163c of rotating member 161c, and the engagement between stopper member 165 and rotating member 161c is released. The operator rotates leg member 131c around rotation shaft 157 of rotating body 151c in a direction in which leg member 131c overlaps with leg member 131a.

[0039] As shown in FIG. 9B, when leg member 131c rotates until it is substantially parallel to leg member 131a and top panel 110, second engagement hole 164c of pivoting member 161c communicates with stopper hole 156. Therefore, engagement portion 166 of stopper member 165 is inserted into second engagement hole 164c by the biasing force of biasing member 168, and stopper member 165 engages with pivoting member 161c. In this way, leg member 131c is maintained in a closed-leg state. Note that leg member 131c can be shifted from the closed-leg state to the open-leg state by releasing the engagement between stopper member 165 and pivoting member 161c. Here, the description has been given with respect to leg member 131c, but because leg members 131c and 131d are one unit, leg member 131d also rotates in the same manner. Note that an operating lever 170 that disengages rotation member 161c fixed to leg member 131c from stopper member 165, and an operating lever 170 that disengages rotation member 161c fixed to leg member 131d from stopper member 165, are positioned adjacent to each other in the center of the tabletop 110 in the left-right direction. Therefore, an operator can release the engagement on either leg member 131c or leg member 131d by gripping the two operating levers 170 with one hand.

[0040] Next, the running unit 180 will be described. The running unit 180 has a function of moving the workbench 100 to any position while supporting the top panel unit 110 and the legs 130. The running unit 180 is connected to the underside of the legs 130. Specifically, the running part 180 has four casters 181a to 181d (see FIG. 5). The casters 181a to 181d are connected to the lower ends of the leg members 131a to 131d, respectively. Since the casters 181a to 181d have the same configuration, only the caster 181a will be described here.

[0041] FIG. 10 is a perspective view showing an example of the configuration of the caster 181a. The caster 181 a includes a wheel portion 182 , a support portion 185 , a pedal portion 195 , and a reinforcing member 200 . The wheel unit 182 has two wheels 183, which rotate independently. By having the wheel unit 182 have two wheels 183, rolling resistance can be reduced compared to a single large wheel, and the caster 181a can run and turn smoothly. The width W of the wheel unit 182 (the combined width of the two wheels 183) is shorter than, for example, the length L1 of the main landing gear 132 in the front-to-rear direction. On the other hand, the diameter of the wheel 183 is longer than, for example, the length L1 of the main landing gear 132 in the front-to-rear direction. The support portion 185 rotatably supports the two wheels 183 and supports the pedal portion 195 so that the pedal portion 195 can swing up and down. The support portion 185 has a fork member 186, a bearing portion 190, an operation portion 193, and a mounting shaft 191.

[0042] The fork member 186 has a pair of side walls 187 located on either side of the two wheels 183, and a top plate 188 that connects the pair of side walls 187 above the wheels 183. The fork member 186 is made of, for example, iron and formed by bending a plate. The fork member 186 has a metallic color such as silver. Note that the longest distance L2 between the outer side surfaces of the pair of side walls 187 is preferably shorter than, for example, the length L1 of the main landing gear 132 in the fore-and-aft direction. An axle 184 that rotatably supports the wheels 183 and a support shaft 189 that swingably supports the pedal unit 195 are inserted through the pair of side walls 187. Note that when the fork member 186 is viewed from a direction perpendicular to the traveling direction of the caster 181a, the position of the axle 184 is offset in the traveling direction from the center of the circular portion of the top plate 188 of the fork member 186. Therefore, the position where the wheels 183 contact the floor surface is also offset in the travel direction from the center of the circular part of the top plate 188.

[0043] Bearing unit 190 is configured by sandwiching steel balls between an upper tray and a lower tray. Bearing unit 190 is made of, for example, iron and has a metallic color such as silver. In bearing unit 190, the upper tray and the lower tray can rotate in relatively different directions around the axis of mounting shaft 191. Of bearing unit 190, the upper tray is connected to mounting shaft 191 via operating unit 193, and the lower tray is connected to top plate 188 of fork member 186. Therefore, two wheels 183 supported by fork member 186 can rotate relative to mounting shaft 191 around the axis of mounting shaft 191. The mounting shaft 191 has a male thread portion 192 extending vertically. The mounting shaft 191 is made of, for example, iron and has a metallic color such as silver.

[0044] The operating unit 193 is a part that an operator operates to attach the caster 181a to the leg 130. The operating unit 193 is made of, for example, iron and is generally plate-shaped. The operating unit 193 is a metallic color such as silver. Specifically, the operating unit 193 has a hexagonal outer shape, and the diameter of the circle connecting the vertices of the hexagon is smaller than the outer diameter of the bearing unit 190. The operating unit 193 is coupled to the mounting shaft 191 and the upper plate of the bearing unit 190. That is, the mounting shaft 191, the operating unit 193, and the upper plate of the bearing unit 190 rotate integrally.

[0045] Pedal portion 195 is a portion that an operator operates to stop or release the rotation of wheel 183. Pedal portion 195 has a pair of side walls 196 located outside side walls 187 of fork member 186, an operating piece 197 for swinging pedal portion 195 up and down, and an overlapping portion 198 that overlaps with a portion of top plate 188 of fork member 186 when viewed from above. Pedal portion 195 is made of, for example, iron, and is formed by bending a plate. Pedal portion 195 is, for example, a metallic color such as silver. A support shaft 189 is inserted through the pair of side walls 196. The operation piece 197 is operated to swing up and down by the foot or the like of the operator. The operation piece 197 is formed to extend diagonally upward. Here, the operation piece 197 extends diagonally at an angle of, for example, 30 to 50 degrees with respect to the horizontal plane. When the pedal portion 195 (operation piece 197) is swung downward, the overlapping portion 198 moves away from a portion of the top plate 188 of the fork member 186 (a colored portion 199, described below) so as not to overlap in the vertical direction. On the other hand, when the pedal portion 195 (operation piece 197) is swung upward, the overlapping portion 198 overlaps in the vertical direction with a portion of the top plate 188 of the fork member 186. At this time, the pair of side walls 196 abut against the top plate 188, thereby restricting the swing range of the pedal portion 195.

[0046] The reinforcing member 200 is a member that transmits the load of the leg member 131a to the bearing portion 190 or the fork member 186 of the caster 181a when the caster 181a is attached to the leg member 131a. The reinforcing member 200 is made of, for example, iron and has a substantially plate shape. The reinforcing member 200 has a metallic color, for example, silver. Specifically, the reinforcing member 200 has a hexagonal outer shape and a substantially annular shape with a hole 201 in the center. The shape of the hole 201 of the reinforcing member 200 substantially matches the outer shape of the operating unit 193 and fits into the operating unit 193. The thickness of the reinforcing member 200 also substantially matches the thickness of the operating unit 193. Furthermore, the diameter of a circle connecting the vertices of the hexagonal outer shape of the reinforcing member 200 is smaller than the outer diameter of the bearing portion 190.

[0047] The caster 181a is connected to the lower end of the leg member 131a. Specifically, the caster 181a is attached to a bracket 205 joined to the lower end of the extendable leg 133 of the leg member 131a. The bracket 205 has a mounting plate 206 and a pair of mounting pieces 208 protruding from both left and right ends of the mounting plate 206. The bracket 205 is made of, for example, iron or titanium, and is formed by bending a plate. The bracket 205 has a metallic color such as silver. The mounting plate 206 has a female screw portion 207 protruding upward in the center. The male screw portion 192 of the mounting shaft 191 of the caster 181a is screwed into the female screw portion 207. The pair of mounting pieces 208 each have a mounting hole 209. The bracket 205 is fixed by using bolts, rivets, etc. through mounting holes 209 in mounting pieces 208, with the openings at the lower ends of the extendable legs 133 of the leg member 131a closed from below by mounting plates 206.

[0048] When attaching the caster 181a to the bracket 205, the worker fits the reinforcing member 200 into the operating portion 193 and rotates the male thread portion 192 of the mounting shaft 191 to screw it into the female thread portion 207 of the bracket 205. If the reinforcing member 200 is not provided, the worker inserts a tool (e.g., a hexagonal wrench) that matches the outer shape of the operating portion 193 from a direction perpendicular to the axial direction of the mounting shaft 191 and rotates it to rotate the mounting shaft 191. On the other hand, in this embodiment, since the reinforcing member 200 is fitted into the operating portion 193, the worker inserts a tool that matches the outer shape of the reinforcing member 200 and rotates it to rotate the mounting shaft 191. When the male thread portion 192 of the mounting shaft 191 and the female thread portion 207 of the bracket 205 are completely screwed together, the caster 181a is connected to the lower end of the leg member 131a via the bracket 205.

[0049] At this time, the reinforcing member 200 is positioned between the bracket 205 and the bearing portion 190 of the caster 181a. That is, the lower surface of the mounting plate 206 of the bracket 205 contacts not only the upper surface of the operating portion 193 of the caster 181a but also the upper surface of the reinforcing member 200. That is, by adding the reinforcing member 200, the contact area between the bracket 205 and the caster 181a can be increased. Therefore, the load from the leg member 131a is distributed and transmitted to the operating portion 193 and the reinforcing member 200 via the mounting plate 206 of the bracket 205. In this way, the distributed transmission of the load can prevent unintended deformation of the bracket 205 and the caster 181a compared to when the load is transmitted locally. Note that the reinforcing member 200 does not have to be positioned between the bracket 205 and the bearing portion 190 of the caster 181a, and may be positioned between the leg member 131a and a portion of the caster 181a (for example, the bearing portion 190 or the fork member 186). Furthermore, the reinforcing member 200 has been described as having a hexagonal outer shape for engagement with a tool, but is not limited to this and may be circular or another polygonal shape.

[0050] Next, a case where the pedal portion 195 is operated to stop the rotation of the wheels 183 of the caster 181a will be described. FIG. 11 is a perspective view showing the state in which the rotation of the wheels 183 of the caster 181a is stopped. To stop the rotation of the wheels 183, the worker operates the operation piece 197 of the pedal unit 195 by depressing it downward. At this time, because the operation piece 197 extends diagonally upward, the worker can easily perform the operation of depressing the pedal unit 195 without losing their footing. By depressing the pedal unit 195, the pedal unit 195 swings downward about the support shaft 189, directly or indirectly pressing against the two wheels 183, thereby stopping the rotation of the two wheels 183. Furthermore, the pedal unit 195 indirectly abuts against the upper plate of the bearing unit 190, thereby stopping the rotation of the wheels 183. At this time, the overlapping portion 198 of the pedal unit 195 separates from the upper surface of the top plate 188 of the fork member 186, exposing the colored portion 199 on the upper surface of the top plate 188. Here, colored portion 199 is a portion that indicates to an operator that wheel 183 has stopped rotating in a manner that is recognizable to the operator. Colored portion 199 is colored a different color from the color of fork member 186. Colored portion 199 is, for example, green. Colored portion 199 may be colored by applying paint to the upper surface of top plate 188, or by adhering a colored sticker to the upper surface of top plate 188. By visually checking colored portion 199 from above, an operator can recognize that wheel 183 cannot rotate.

[0051] By stopping the rotation of the wheels 183, even if a worker applies a horizontal force to the work platform 100 in an attempt to move it, the wheels 183 do not rotate, and friction occurs between the wheels 183 and the floor, preventing the work platform 100 from moving. That is, when working at height, the worker operates the pedal units 195 of the casters 181a to 181d of the running unit 180 to stop the rotation of the wheels 183, thereby preventing the work platform 100 from moving. By preventing the work platform 100 from moving in this way, the worker can safely work at height.

[0052] Next, the rotation restricting portion 220 will be described. The rotation restricting portion 220 has a function of restricting the rotation of the legs 130 relative to the top panel portion 110. Specifically, rotation restricting portion 220 has stay portions 221a to 221d (see FIG. 5). Stay portions 221a and 221b restrict the rotation of leg members 131a and 131b via rotating bodies 151a and 151b. Stay portions 221c and 221d restrict the rotation of leg members 131c and 131d via rotating bodies 151c and 151d. Here, stay portion 221a will be described. Stay portion 221a and stay portion 221b have a substantially symmetrical configuration. Stay portion 221a and stay portion 221c have a substantially symmetrical configuration in the front-rear direction, and stay portion 221b and stay portion 221d have a substantially symmetrical configuration in the front-rear direction.

[0053] As shown in FIGS. 3 and 4, the stay portion 221a is disposed between the top panel portion 110 and the second-highest cross member 137a. FIG. 12 is a perspective view of the stay portion 221a as seen obliquely from below. The stay portion 221a includes a first stay member 222, a second stay member 224, and a slide member 226. The first stay member 222 is rotatably connected to the underside of the top panel 110 via a bracket 223. The second stay member 224 is rotatably connected to the upper surface of the cross member 137a via a bracket 225. The first stay member 222 is a linear member having, for example, a substantially U-shaped cross section. The second stay member 224 is a linear member having, for example, a substantially U-shaped or C-shaped cross section. The first stay member 222 and the second stay member 224 are made of, for example, an aluminum alloy and formed by extrusion molding. The first stay member 222 and the second stay member 224 are a metallic color such as silver. A rotation shaft 229 is inserted through the position where the first stay member 222 and the second stay member 224 overlap. The first stay member 222 and the second stay member 224 are rotatable via a rotation shaft 229. The first stay member 222 and the second stay member 224 are allowed to rotate in the direction in which the rotation shaft 229 faces the arrow direction shown in Fig. 12. However, the first stay member 222 and the second stay member 224 abut against each other, thereby restricting rotation of the rotation shaft 229 in the direction opposite to the arrow direction.

[0054] The slide member 226 is slidable along the first stay member 222. The slide member 226 is a linear member having a substantially rectangular cross section (closed cross section). The slide member 226 is made of, for example, an aluminum alloy and formed by extrusion molding. The slide member 226 is colored a different color from the first stay member 222 and the second stay member 224. The slide member 226 is, for example, orange or red. The slide member 226 is colored, for example, during an anodizing process. The slide member 226 has an arrow-shaped hole 227 on the upper side that indicates the slidable direction. The hole 227 penetrates the upper plate surface of the slide member 226.

[0055] Furthermore, when the linear direction of the first stay member 222 and the linear direction of the second stay member 224 are substantially aligned, the slide member 226 can slide to a position spanning the first stay member 222 and the second stay member 224. At this time, a stopper protruding toward the upper side of the second stay member 224 stops the slide member 226 from sliding further toward the second stay member 224. Furthermore, when the slide member 226 slides to the spanning position, a friction imparting member 228 provided on the second stay member 224 comes into contact with the inner circumferential surface, thereby preventing the slide member 226 from unintentionally returning to the first stay member 222 side. By positioning the slide member 226 spanning the first stay member 222 and the second stay member 224, rotation between the first stay member 222 and the second stay member 224 is restricted. Therefore, it is possible to prevent rotation of first stay member 222 and second stay member 224 by slide member 226. If first stay member 222 and second stay member 224 do not rotate, leg member 131a and leg member 131b cannot move closer to top panel 110, and therefore unintentional rotation of leg member 131a and leg member 131b relative to top panel 110 can be prevented.

[0056] On the other hand, by sliding the slide member 226 back toward the first stay member 222, the first stay member 222 and the second stay member 224 can rotate, and the leg members 131a and 131b can move closer toward the top plate portion 110, so that the leg members 131a and 131b can rotate so as to fold relative to the top plate portion 110. 13 is a diagram showing a closed-leg state in which the legs 130 are folded relative to the top panel 110. Note that when folding, the top panel 110 is folded so that it touches the floor, and therefore the top panel 110, leg member 131a, and leg member 131c are stacked from the bottom up. In addition, in the closed-leg state, the first stay member 222 of the stay portion 221a is located inside the top panel 110, and the second stay member 224 is located between the leg members 131a and 131b. Note that an abutment member 138 is disposed on the cross member 137a between the leg members 131a and 131b, and therefore when another workbench 100 is stacked, the top panel 110 of the other workbench 100 can be stably stacked on the abutment member 138.

[0057] Here, in the workbench 100 of this embodiment, the legs 130 do not extend completely vertically in the open leg position, but are inclined relative to the vertical to improve stability. That is, when the workbench 100 is viewed in the left-right direction as shown in FIG. 3, the pair of legs 140A, 140B are inclined so as to move away from each other from the upper end to the lower end. 14 is a front view showing an example of the configuration of leg member 131a in which telescopic leg 133 is adjusted to protrude most from main leg 132. As shown in FIG. 14, leg member 131a is inclined at an inclination angle of approximately 88 degrees on the acute side with respect to the horizontal plane. Similarly, leg members 131b to 131d are also inclined at an inclination angle of approximately 88 degrees on the acute side with respect to the horizontal plane. Therefore, leg members 131a and 131c are inclined so as to move away from each other toward their bottom ends, and leg members 131b and 131d are inclined so as to move away from each other toward their bottom ends. The inclination angles of leg members 131a to 131d are set by the lengths of stay portions 221a to 221d of rotation restriction portion 220, respectively. That is, when the first stay member 222 and the second stay member 224 of the stay portions 221a to 221d are substantially linear, the inclination angle can be reduced and the stay portions can be set to be more inclined by increasing the combined length of the first stay member 222 and the second stay member 224. In this way, the leg members 131a to 131d are inclined in a direction away from the center of the tabletop portion 110 as they approach the lower ends, allowing the legs 130 of the workbench 100 to stably support the tabletop portion 110. Meanwhile, the leg members 131a to 131d extend in a substantially vertical direction when viewed from the front-to-rear direction. Therefore, when viewed from the front-to-rear direction, the leg members 131a and 131b extend in a substantially vertical direction parallel to each other, and the leg members 131c and 131d extend in a substantially vertical direction parallel to each other.

[0058] Here, if the legs 130 are tilted too far, the lower ends of the leg members 131a to 131d will protrude in the front-to-rear direction. Therefore, when the workbench 100 is moved closer to a wall or another workbench 100, the leg members 131a to 131d will interfere, making it impossible to move the workbench 100 closer to the wall or another workbench 100. Therefore, in this embodiment, as shown in FIG. 2 , the leg members 131a to 131d are arranged so that they do not protrude from the outer periphery of the tabletop 110 when viewed from above the workbench 100. In other words, when viewed from above the workbench 100, the leg members 131a to 131d are arranged so that the upper to lower ends of the leg members 131a to 131d overlap the tabletop 110. Therefore, since the leg members 131a to 131d do not interfere, the workbench 100 can be easily moved closer to a wall or another workbench 100, improving the flexibility of installation of the workbench 100.

[0059] Casters 181a to 181d, which are rotatable about vertical axes, are connected to the lower ends of the leg members 131a to 131d. As shown in FIG. 14, even when the caster 181a is rotated to the outermost position, none of the caster 181a, including the pedal unit 195, extends beyond the line E, which is a vertical extension of the outer periphery of the tabletop 110. In other words, when viewed from above the workbench 100, the casters 181a to 181d are arranged so as to overlap the tabletop 110. Therefore, since the casters 181a to 181d do not interfere with each other, the workbench 100 can be easily placed close to a wall, another workbench 100, or the like, thereby improving the flexibility of installation of the workbench 100. Note that FIG. 14 shows a locus C when the pedal unit 195 is swung. Here, the curve of the locus C also does not extend beyond the line E.

[0060] If the leg members 131a to 131d are inclined at an angle of approximately 88 degrees on the acute side relative to the horizontal plane, the lower surfaces of the leg members 131a to 131d will be inclined at approximately 2 degrees relative to the horizontal plane if left as is. Therefore, in this embodiment, the lower surfaces of the leg members 131a to 131d are processed so that they are approximately parallel to the horizontal plane. Specifically, the lower end of the extendable leg 133 is cut at an angle of approximately 2 degrees relative to a direction perpendicular to the longitudinal direction. Therefore, the lower surfaces of the leg members 131a to 131d are approximately parallel to the horizontal plane. By making the lower surfaces of the leg members 131a to 131d approximately parallel to the horizontal plane in this way, the casters 181a to 181d can be arranged in an approximately vertical direction.

[0061] (Second embodiment) Next, a second embodiment will be described. The running unit 180 of this embodiment has four casters 241a to 241d connected to the lower ends of the leg members 131a to 131d. Since the casters 241a to 241d have the same configuration, only the caster 241a will be described here. Note that the same components as those in the first embodiment are given the same reference numerals and descriptions thereof will be omitted as appropriate. FIG. 15 is a perspective view showing an example of the configuration of the caster 241a. The caster 241a has a wheel portion 182, a support portion 185, a pedal portion 195, and a nut 242 as a fastener, and a washer 243. The caster 241a does not have the reinforcing member 200 of the first embodiment.

[0062] In this embodiment, the caster 241a is attached to the bracket 230 in advance, and the bracket 230 to which the caster 241a is attached is joined to the lower end of the extendable leg 133, thereby connecting the caster 241a to the leg member 131a. Bracket 230 has a mounting plate 206 and a pair of mounting pieces 208. Mounting plate 206 has a hole-shaped rotation prevention portion 231 in the center. Rotation prevention portion 231 roughly matches the outer shape of operating portion 193, which serves as the portion to be prevented from rotating of support portion 185, and operating portion 193 is fitted into it. To connect the caster 241a to the leg component 131a, first, the operating portion 193 of the caster 241a is fitted into the rotation prevention portion 231 of the bracket 230. Next, the washer 243 is inserted into the mounting shaft 191 from above the bracket 230, and the nut 242 is screwed onto the male thread portion 192 of the mounting shaft 191, thereby attaching the caster 241a to the bracket 230. Finally, the opening at the lower end of the telescopic leg 133 of the leg component 131a is closed from below with the mounting plate 206 of the bracket 230, and the caster 241a is fixed using a bolt, rivet, or the like via the mounting hole 209 of the mounting piece 208.

[0063] By connecting the caster 241a to the leg member 131a in this manner, rotation around the axis of the mounting shaft 191 is prevented between the rotation prevention portion 231 of the bracket 230 and the operating portion 193 of the caster 241a. Now, let's assume that an operator presses down on the operating piece 197 of the pedal unit 195 to stop the rotation of the wheel 183 and the rotation of the wheel 183. If an obstacle were to collide with the wheel 183, fork member 186, or pedal unit 195 of the caster 241a, a force would be generated that would cause the caster 241a to rotate. However, because the rotation of the wheel 183 is stopped, the force that would cause the caster 241a to rotate would be converted into a force that would cause the operating portion 193 and the mounting shaft 191 to rotate around the axis. If the bracket 230 did not have the rotation prevention portion 231, the mounting shaft 191 and the nut 242 would rotate relatively in a direction that loosens the threaded engagement between them. On the other hand, when the bracket 230 has the anti-rotation portion 231 as in this embodiment, even if the operating unit 193 and the mounting shaft 191 attempt to rotate, the anti-rotation portion 231 restricts the operating unit 193 from rotating, thereby preventing loosening between the mounting shaft 191 and the nut 242. Note that although the case where the operating unit 193 of the caster 241a and the anti-rotation portion 231 of the bracket 230 do not rotate together has been described here, this is not a limitation. For example, the bracket 230 may be configured to prevent rotation between a member that rotates relative to the wheel 183 (e.g., the upper tray of the bearing unit 190, etc.). Furthermore, the operating unit 193 is not limited to having a hexagonal outer shape, and may be any other shape other than a perfect circle, such as a polygon or an oval. On the other hand, the anti-rotation portion 231 may have any shape as long as the operating unit 193 is fitted into the anti-rotation portion 231 and does not rotate relative to the bracket 230.

[0064] (Third embodiment) Next, a third embodiment will be described. In this embodiment, when the legs 130 are folded relative to the top panel 110, conversion members 251a and 251b are provided to convert the position of the casters 181c and 181d so that the wheel parts 182 of the casters 181c and 181d are horizontal. 4, the conversion members 251a and 251b are fixed to the rear side surfaces of the leg members 131a and 131b, respectively, using bolts, rivets, etc. The conversion members 251a and 251b are made of, for example, synthetic resin.

[0065] Fig. 16 is a diagram showing an example of the configuration of conversion member 251a. Fig. 17 is a cross-sectional view showing the action of conversion member 251a changing the posture of caster 181c, taken along line III-III shown in Fig. 16 and viewed from the direction of the arrow. Note that conversion member 251b has a shape symmetrical to conversion member 251a, and therefore a description thereof will be omitted. As shown in FIG. 16, the conversion member 251a has an attachment portion 252 and a conversion portion 253. The attachment portions 252 are located on both sides (up and down) of the conversion member 253. Here, the attachment portions 252 are attached to the side surfaces of the leg member 131a using rivets 254, thereby fixing the conversion member 251a to the leg member 131a. As shown in FIG. 17, the conversion portion 253 is inclined with respect to the side surface of the leg member 131a to which the conversion member 251a is attached. Specifically, the conversion portion 253 is inclined so that the height H (distance from the side surface) gradually decreases from right to left. Next, a case where an operator folds leg member 131c will be described. Here, it is assumed that leg member 131a of leg portion 130 shown in Fig. 13 has already been folded and is placed on top plate portion 110, and that leg member 131c is now approaching leg member 131a in order to fold leg member 131c.

[0066] 17(a) and (b) are assumed to be cross-sectional views taken along line IV-IV in Fig. 13 and viewed from the direction of the arrows. When leg member 131c is brought close to already folded leg member 131a in order to fold leg member 131c, caster 181c rotates under its own weight, and operation piece 197 is placed on the lower side. As shown in FIG. 17(a), when the leg member 131c is brought close to the leg member 131a in the stacking direction, the tip of the operation piece 197 comes into contact with the conversion portion 253 of the conversion member 251a. Because the conversion portion 253 is inclined, the operation piece 197 that comes into contact with the conversion portion 253 is guided to rotate in the direction in which the height H of the conversion portion 253 is lower. Therefore, as shown in FIG. 17(b), the caster 181c is in a rotated state in which the operation piece 197 is on the outside (left side) of the leg member 131a. By rotating the operation piece 197 in this manner, as shown in FIG. 13, the wheel portion 182 of the caster 181c is oriented approximately horizontally, i.e., the axle 184 is oriented approximately vertically. By making the wheel portion 182 approximately horizontal, the thickness of the workbench 100 can be made compact when folded.

[0067] If the conversion member 251a is not present, when the leg member 131c is brought close to the leg member 131a in the stacking direction, the tip of the operation piece 197 may come into contact with the side surface of the leg member 131a and remain in contact without rotating. In this case, the wheel portion 182 of the caster 181c becomes substantially vertical, and the thickness of the workbench 100 increases when folded. As described above, according to this embodiment, conversion member 251a rotates caster 181c connected to leg member 131c to change its position and moves wheel section 182 to a state in which it is substantially horizontal, thereby enabling workbench 100 to have a compact thickness when folded. Note that while conversion member 251a has been described, conversion member 251b also functions in a similar manner. That is, when leg member 131c is folded, leg member 131d is also folded in conjunction with leg member 131c, and at this time caster 181d is rotated by conversion member 251b so that operation piece 197 is on the outside (right side) of leg member 131b.

[0068] In addition, in the above-described embodiment, the case where the operating pieces 197 of the casters 181c and 181d rotate to be on the outside of the leg members 131a and 131b has been described, but by reversing the inclination direction of the conversion portion 253, the operating pieces 197 may also rotate to be on the inside of the leg members 131a and 131b. Furthermore, in the above-described embodiment, the case where the operating piece 197 of the casters 181c, 181d comes into contact with the conversion part 253 has been described, but the casters 181c, 181d may also be rotated by contact of a part of the wheel part 182, the support part 185 or the pedal part 195 of the casters 181c, 181d. Furthermore, in the above-described embodiment, the case where the casters 181c, 181d are rotated has been described, but this is not limited to this. For example, by providing the conversion members 251a, 251b on the underside of the tabletop 110, when the leg members 131a, 131b are folded relative to the tabletop 110, the conversion members 251a, 251b may rotate the casters 181a, 181b connected to the leg members 131a, 131b to change their position, and transition the wheel unit 182 to a state in which it is oriented in a substantially horizontal direction.

[0069] (Fourth embodiment) Next, a fourth embodiment will be described. In this embodiment, when the bridge 20 is connected to the workbench 100, a floating prevention member 24 is provided to prevent the bridge 20 from floating up from the workbench 100. 18 is a cross-sectional view showing an example of the configuration of the bridge 20 according to this embodiment. Here, the portion of the bridge 20 where the anti-floating members 24 are located is cut away. Note that the same components as those in the first embodiment are given the same reference numerals and their description will be omitted.

[0070] The bridge 20 is the end that connects to the workbench 100, and a floating prevention member 24 is provided between two connecting pins 22 via a bracket 23. The floating prevention member 24 is positioned offset inward from the connecting pins 22. The floating prevention member 24 has a guide shaft 25, a contact member 26, and a spring member 27. The guide shaft 25 protrudes downward from the lower surface of the bracket 23 and guides the movement of the abutting member 26 in the vertical direction. The abutment member 26 has an upper piece 26a and a lower piece 26b, and is formed in a generally U-shape. The upper piece 26a is generally plate-shaped, and the guide shaft 25 is inserted through it. The lower piece 26b is also generally plate-shaped, and functions as an abutment portion that can abut against the lower surface of the bridge 20 and the lower surface of the top plate portion 110. The spring member 27 is disposed between the lower end of the guide shaft 25 and the upper piece 26a of the contact member 26, and biases the contact member 26 upward, that is, toward the bracket 23 side.

[0071] 18(a) and (b) show the states before and after the abutment member 26 is rotated 90 degrees around the axis of the guide shaft 25. Here, the width of the lower piece 26b of the abutment member 26 is W (see FIG. 18(a)), and the length perpendicular to the width W is S (see FIG. 18(b)). The width W is shorter than the distance L3 from the outer edge of the lower surface of the bridge 20 to the outer edge of the lower surface of the top plate portion 110, and the length S is longer than the distance L3. Meanwhile, the outer peripheral edge of the top panel 110 has a plate-shaped side portion 127, to which a plate-shaped lower portion 129 is connected, forming a substantially L-shape. In this embodiment, the side portion 127 and the lower portion 129 have a cutout (recess) 128 formed by removing the side portion 127 and the lower portion 129 at a portion in the longitudinal direction thereof, which is adjacent to the anti-floating member 24 when the bridge 20 is connected. The cutout 128 is recessed, and the lower piece 26b of the abutment member 26 engages with the cutout 128. The cutout 128 may be provided in either the side portion 127 or the lower portion 129.

[0072] Next, the function of the abutting member 26 to prevent the bridge 20 from floating up will be described. First, starting from the state shown in FIG. 18(a), the worker inserts the connecting pins 22 into the connecting holes 118 from above, thereby connecting the bridge 20 to the workbench 100. 18(b), the worker pulls the abutment member 26 against the biasing force of the spring member 27 and rotates it 90 degrees around the axis of the guide shaft 25, and then releases the tension on the abutment member 26. Therefore, the lower piece 26b of the abutment member 26 abuts on the underside of the top plate portion 110 and the underside of the bridge 20 while straddling them. Even if a force is applied to the bridge 20 in this state that would cause it to float upward, the bridge 20 can be prevented from floating up because the lower piece 26b is in contact with the underside of the top plate portion 110. Furthermore, when lower piece 26b of this embodiment abuts against the underside of tabletop portion 110, it enters and engages with notch 128 of tabletop portion 110 from below. Therefore, even if vibrations occur in bridge 20 due to work at height and are transmitted to contact member 26, contact member 26 will not rotate due to the vibrations and come out of notch 128, and contact between contact member 26 and tabletop portion 110 can be prevented from being released.

[0073] The present invention has been described above using the above-mentioned embodiments, but the present invention is not limited to only the above-mentioned embodiments, and modifications and the like are possible within the scope of the present invention, and the present invention may be combined with each embodiment. In the above-described embodiment, the leg members 131a to 131d are inclined at an angle of approximately 88 degrees on the acute side relative to the horizontal plane, but this is not limited to this case, and the leg members may be inclined at an angle smaller than 90 degrees and larger than 80 degrees, preferably larger than 85 degrees. In the above-described embodiment, the wheel unit 182 has two wheels 183, but the present invention is not limited to this, and the wheel unit 182 may have only one wheel 183.

[0074] In the above embodiment, the leg members 131a to 131d have the extendable legs 133, but this is not limitative and the extendable legs 133 may not be included. In the above-described embodiment, in the closed leg position, the folding is performed so that top panel 110, leg member 131a, and leg member 131c overlap in this order, but this is not limited to this. For example, if leg members 131a to 131d are short or top panel 110 is large, leg members 131a and 131c may not overlap each other but may overlap directly on top panel 110 with leg members 131a and 131c adjacent to each other in the front and rear. In this case, rotating bodies 151c and 151d are configured approximately symmetrically in the front and rear with respect to rotating bodies 151a and 151b.

[0075] In the above-described embodiment, the leg members 131a and 131b extend parallel to each other in a substantially vertical direction, and the leg members 131c and 131d extend parallel to each other in a substantially vertical direction when viewed from the front-to-rear direction. However, this is not a limitation. For example, the leg members 131a and 131b may be inclined so as to move away from each other downward, and the leg members 131c and 131d may be inclined so as to move away from each other downward. Even in this case, the casters 181a to 181d are arranged so as to overlap the top panel portion 110 when viewed from above the workbench 100. In the above embodiment, the leg section 130 has four leg members 131a to 131d, but the present invention is not limited to this, and the leg section 130 may have five or more leg members. In this embodiment, the leg portion 130 is inclined relative to the vertical direction, and is arranged so that, when viewed from above the workbench 100, its top end to bottom end overlaps the top plate portion 110. However, this is not limited to this case, and modifications can be made as appropriate depending on the task, etc. [Explanation of symbols]

[0076] 100: Mobile workbench 110: Top plate portion 118: Connecting hole 120: Cylinder member 130: Leg portion 131a to 131d: Leg member 150: Rotating portion 180: Running portion 181a to 181d: Caster 182: Wheel portion 183: Wheel 195: Pedal portion 200: Reinforcing member 205: Bracket 241a to 241d: Caster

Claims

1. A mobile workbench comprising a top plate portion and legs connected to the underside of the top plate portion and extending from the top plate portion toward a floor surface, The leg portion has four leg members, the leg member includes a main leg and an extendable leg that extends or shortens the length of the leg member by gradually changing the length of the leg member that protrudes from a lower end of the main leg; If the four leg members are respectively referred to as a first leg member, a second leg member, a third leg member, and a fourth leg member, The leg portion is a plurality of first bridging members spaced apart in the vertical direction between the main leg of the first leg member and the main leg of the second leg member, and between the main leg of the third leg member and the main leg of the fourth leg member; a second cross member that is bridged between the telescopic legs of the first leg member and the telescopic legs of the second leg member, and between the telescopic legs of the third leg member and the telescopic legs of the fourth leg member; The colors of the plurality of first lateral members and the color of the second lateral member are different from each other, The color of each of the plurality of first cross members is silver, A mobile workbench characterized in that the color of the second cross member is gold.

2. 2. The mobile work platform according to claim 1, wherein the second cross member has a color different from that of the main landing gear.

3. A mobile workbench as described in Claim 2, characterized in that the color of the main landing gear is silver.

4. 4. The mobile work platform according to claim 3, wherein the second cross member has a color different from that of the telescopic legs.

5. A mobile workbench as described in Claim 4, characterized in that the color of the telescopic legs is silver.

6. A mobile workbench described in any one of claims 1 to 5, characterized in that the second cross member is colored by anodizing.

Images