Workbench

Abstract

To improve stability of a stretched bar.SOLUTION: A work table 100 comprises: a rectangular top plate portion 110 having a pair of long sides and a pair of short sides; a first leg body 131a disposed at one short side of the pair of short sides; a second leg body 131b disposed at the other short side of the pair of short sides; a pair of first posts 141a, 141b disposed at both end sides of one short side along a vertical direction; and a short side batten 150a capable of changing between a state along one post 141b of the pair of first posts 141a, 141b and a state of stretched between the pair of first posts 141a, 141b.SELECTED DRAWING: Figure 4

Description

[Technical field]

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

[0002] Conventionally, work platforms for working at heights have been known. Patent Document 1 discloses a portable work platform in which a top plate is suspended between a pair of ladder-shaped main legs, the work platform having handrail posts erected at the four corners of the top plate, handrail rails arranged in opposing positions along the longitudinal direction of the top plate from the handrail posts, and a short-side handrail rail rotatably attached to the upper end of the long-side handrail rail. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-255586 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the work platform disclosed in Patent Document 1, the short-side handrail rail is fixed by inserting the locking protrusion of the short-side handrail rail into the locking hole formed in the opposite handrail rail. However, since the short-side handrail rail is attached to the long-side handrail rail, which is easily movable, there is a risk that the short-side handrail rail may lose stability. The present invention has been made in consideration of the above-mentioned problems, and has an object to improve the stability of the bars that are bridging the gap. [Means for solving the problem]

[0005] The workbench of the present invention comprises a rectangular top panel having a pair of long sides and a pair of short sides, a first leg body arranged on one of the pair of short sides, a second leg body arranged on the other of the pair of short sides, a pair of first support columns arranged along the up-down direction on both ends of the one short side, and a first bar that can be deformed between a state along one of the pair of first support columns and a state bridged between the pair of support columns. The one support has a first side wall that faces the other support, and the first bar has a base that overlaps the first side wall when aligned along the one support. It is characterized by: Effect of the Invention

[0006] According to the present invention, the stability of the spanning bar can be improved. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is a diagram showing an example of the configuration of a workbench according to the first embodiment. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] 13 is a perspective view showing the state in which the short side rail is spanned between the posts. FIG. [Diagram 5] FIG. 2 is a perspective view showing a state in which the short side rail is aligned with the support pillar. [Figure 6] A cross-sectional view of a short side rail and a support pillar. [Figure 7] 13A to 13C are diagrams illustrating a method for folding the workbench. [Figure 8] 13A to 13C are diagrams illustrating a method for folding the workbench. [Figure 9] 13A to 13C are diagrams illustrating a method for folding the workbench. [Figure 10] 13A to 13C are diagrams illustrating a method for folding the workbench. [Figure 11] 13A to 13C are diagrams illustrating a method for folding the workbench. [Figure 12] 13A to 13C are diagrams illustrating a method for folding the workbench. [Figure 13] FIG. 13 is a perspective view showing an example of a configuration of a workbench according to a modified example. [Figure 14] FIG. 13 is a perspective view showing an example of a configuration of a workbench according to a modified example. [Figure 15] FIG. 11 is a diagram showing an example of the configuration of a workbench according to a second embodiment. [Figure 16] FIG. 1 is a front view of the workbench. [Figure 17] FIG. [Figure 18] 13A to 13C are diagrams illustrating a method for folding the workbench. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, the workbench according to this embodiment will be described with reference to the drawings. (First embodiment) The portable work platform 100 according to the first embodiment is a work platform for a worker to work at height. The portable work platform 100 (hereinafter referred to as the work platform 100) is assumed to have a height of, for example, about 620 mm to about 1910 mm from the floor surface to a top plate portion 110 described later.

[0009] Fig. 1 is a diagram showing an example of the configuration of a workbench 100 according to a first embodiment. Fig. 2 is a diagram showing the workbench 100 as viewed from the rear side. Fig. 3 is a plan view of the workbench 100. For ease of explanation, in each diagram, 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 portion 110 , legs 130 , an enclosure portion 140 , a rotating portion 180 , and a rotation restricting portion 190 .

[0010] The top plate 110 functions as a foothold for workers working at height. When viewed from above, the top plate 110 has a rectangular shape that is long in the front-rear direction and has a pair of long sides and a pair of short sides. The top plate 110 has a length of, for example, approximately 1500 mm in the front-rear direction and a length of, for example, approximately 500 mm in the left-right direction. The top plate 110 is made of, for example, an aluminum alloy and is formed by extrusion molding. The top plate 110 has a metallic color, such as silver.

[0011] 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 front-rear end portions 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 as to overlap the top panel 110. Specifically, the leg 130 has a pair of legs 131a and 131b. The leg 131a is disposed on one of a pair of short sides of the top plate 110. The leg 131a is located at the rear in the front-rear direction and extends from the top plate 110 toward the floor. The leg 131b is disposed on the other of a pair of short sides of the top plate 110. The leg 131b is located at the front of the top plate 110 in the front-rear direction and extends from the top plate 110 toward the floor. As shown in FIG. 1, the leg 131a and the leg 131b face each other at positions separated in the front-rear direction and are inclined so as to move away from each other toward the lower end. The leg 131a and the leg 131b are so-called ladder-shaped, and an operator can ascend and descend between the top plate 110 and the floor.

[0012] Leg body 131a has leg members 132a and 132b and a plurality of cross members 138 (see FIG. 2). Leg members 132a and 132b are located at both ends in the left-right direction of tabletop portion 110. Leg members 132a and 132b face each other with a gap in between in the left-right direction, and are inclined so as to move away from each other toward the lower end. The leg members 132a, 132b can adjust the height of the tabletop 110 by expanding and contracting the length along the longitudinal direction. The leg members 130 can be adjusted in height in steps of 60 mm intervals between 0 mm and 400 mm, for example. In Figs. 1 and 2, the positions where the leg members 132a, 132b are shortened are indicated by two-dot chain lines. The leg members 132a, 132b are made of, for example, an aluminum alloy, and are formed by extrusion molding. The leg members 132a, 132b are, for example, a metallic color such as silver.

[0013] The horizontal member 138 is a so-called stepping bar, and is a member on which a worker places his / her feet when ascending or descending. The horizontal member 138 spans between the leg members 132a and 132b in the horizontal direction. The horizontal member 138 is made of, for example, an aluminum alloy, and is formed by extrusion molding. Here, the leg 131a has been described, but the leg 131b has a similar configuration, so it is given the same reference numerals and the description thereof is omitted.

[0014] The enclosure 140 has a function of enclosing a work space above the top plate 110. The enclosure 140 has pillars 141a to 141d, a pair of long side rails 144a, 144b, and a pair of short side rails 150a, 150b. The pillars 141a to 141d are each disposed substantially vertically at a corner of the top plate portion 110. The pillars 141a and 141b are located at both ends of one short side of the top plate portion 110, and the pillars 141c and 141d are located at both ends of the other short side of the top plate portion 110. The pillars 141a to 141d are rotatably connected to brackets 149 fixed to the upper ends of the leg members 132a and 132b, respectively.

[0015] The pillars 141a to 141d each include a pillar member 142 and an expandable member 143. The pillars 141a to 141d are extendable and contractable in the vertical direction. The support member 142 is a member located below the support members 141a to 141d. The support member 142 is, for example, a hollow member having a substantially rectangular cross section. The support member 142 is made of, for example, an aluminum alloy, and is formed by extrusion molding. The support member 142 is, for example, a metallic color such as silver. The elastic member 143 is a member located above the support columns 141a to 141d, and causes the support columns 141a to 141d to expand and contract in the up-down direction. The elastic member 143 is, for example, a hollow member having a substantially rectangular cross section. The elastic member 143 fits into the outside of the support column member 142 and is slidable along the support column member 142. The elastic member 143 is, for example, made of synthetic resin, and is formed by extrusion molding. The elastic member 143 is, for example, a first color different from the top panel portion 110, such as yellow. The pillars 141a to 141d can be locked in either an extended state or a retracted state. When the work space is enclosed by the enclosure 140, the pillars 141a to 141d are in an extended state, and when the workbench 100 is folded, the pillars 141a to 141d are in a retracted state. However, the pillars 141a to 141d may be configured not to be retractable in the vertical direction.

[0016] The long side rails 144a and 144b are disposed on the upper side of the long side end of the outer periphery of the top plate portion 110. The long side rails 144a and 144b are substantially bar-shaped. The long side rail 144a is located on the upper side of one long side of the top plate portion 110, and the long side rail 144b is located on the upper side of the other long side of the top plate portion 110. The long side rail 144a is bridged between the support pillars 141a and 141c, and the long side rail 144b is bridged between the support pillars 141b and 141d. The long side rails 144a and 144b are respectively bridged between the support pillars, so that the work space can be surrounded from the left and right.

[0017] In addition, the long side rail 144a can be deformed from a state in which it is stretched between the support pillars 141a and 141c to a state along the support pillars 141a and 141c, and the long side rail 144b can be deformed from a state in which it is stretched between the support pillars 141b and 141d to a state in which it is stretched along the support pillars 141b and 141d. Specifically, the long side rail 144a has a pair of division members 145a and 145c, and the long side rail 144b has a pair of division members 145b and 145d. The long side rails 144a and 144b can be separated approximately at the center in the longitudinal direction by a pair of division members 145a and 145c and a pair of division members 145b and 145d, respectively. The division members 145a to 145d are approximately bar-shaped. The divided members 145a to 145d are, for example, hollow members having a substantially rectangular cross section. The divided members 145a to 145d are, for example, made of synthetic resin and formed by extrusion molding. The divided members 145a to 145d are, for example, a first color different from the top panel portion 110, such as yellow.

[0018] The divided members 145a to 145d are rotatable relative to the upper ends of the respective pillars 141a to 141d. Specifically, a substantially L-shaped bracket 146 is fixed to the upper ends of the pillars 141a to 141d (see Figs. 4 and 5 described below). The bracket 146 has an axis member 147. The axis member 147 penetrates the divided members 145a to 145d and the bracket 146 in the left-right direction, and rotatably supports the divided members 145a to 145d. The divided members 145a to 145d rotate about the axis member 147, so that they rotate from a substantially horizontal state to a state aligned with the pillars 141a to 141d. When divided members 145a and 145c are aligned with pillars 141a and 141c, divided members 145a and 145c overlap with pillars 141a and 141c in the front-rear direction so as to be located more inward than pillars 141a and 141c. When divided members 145b and 145d are aligned with pillars 141b and 141d, divided members 145b and 145d overlap with pillars 141b and 141d in the front-rear direction so as to be located more inward than pillars 141b and 141d.

[0019] At this time, a gap G is formed between the divided member 145a and the support 141a near the height position of the engagement protrusion 170 described later so that the guide portion 156b of the short side rail 150a described later can enter (see FIG. 5). Similarly, a gap G (not shown) is formed between the divided member 145d and the support 141d so that the guide portion 156b of the short side rail 150b can enter. Note that the gap G does not always have to be a constant distance between the divided members 145a, 145d and the support 141a, 141d, and for example, the distance of the gap G may become smaller closer to the tip of the divided members 145a, 145d. Also, a gap (not shown) is formed between the divided member 145b and the support 141b so that the short side rail 150a can overlap the support 141b. Similarly, a gap (not shown) is formed between divided member 145c and support column 141c so that short-side rail 150b can overlap support column 141c.

[0020] Further, the divided members 145a and 145d have a connecting member 148. The connecting member 148 connects the tip ends of the divided members 145a and 145c and the tip ends of the divided members 145b and 145d so that the long side rails 144a and 144b are respectively bridged between the supports. The connecting member 148 has, for example, an operating part that is fitted into the outer periphery of the divided members 145a and 145d and is slidable along the long direction of the divided members 145a and 145d, and a sliding part that can advance and retreat from openings at the tips of the divided members 145a and 145d in response to the sliding of the operating part. The user can bridge long side rail 144a between support posts 141a and 141c by positioning separate members 145a and 145c approximately horizontally so that the tip of separate member 145a faces the tip of separate member 145c, and then extending connecting member 148 of separate member 145a from its tip and inserting it into the opening at the tip of separate member 145c. In the same manner, long side rail 144b can be bridged between support posts 141b and 141d.

[0021] The short side rails 150a and 150b are disposed above the short end of the outer periphery of the tabletop portion 110. The short side rail 150a is located above one short side of the tabletop portion 110, and the short side rail 150b is located above the other short side of the tabletop portion 110. The short side rail 150a is bridged between the support columns 141a and 141b, and the short side rail 150b is bridged between the support columns 141c and 141d. By having the short side rails 150a and 150b each bridge between the support columns, the work space can be surrounded from the front and back.

[0022] In addition, the short side rail 150a can be transformed from a state in which it is stretched between the support pillars 141a and 141b to a state in which it is aligned with the support pillar 141b, and the short side rail 150b can be transformed from a state in which it is stretched between the support pillars 141c and 141d to a state in which it is aligned with the support pillar 141c. When the short side rails 150a and 150b are aligned with the support pillars 141b and 141c, respectively, they overlap with the support pillars 141b and 141c. When a worker is working at a height surrounded by the enclosure 140 and needs to descend to the floor, the short side rail 150a can be transformed from a standing state on the top plate 110 to a state in which it is aligned with the support pillar 141b, or the short side rail 150b can be transformed to a state in which it is aligned with the support pillar 141c. The worker can move between the top plate 110 and the floor by raising and lowering the legs 131a and 131b. At this time, the pillars 141a to 141d become handholds for the worker to ascend and descend stably. When the worker returns to the top panel 110, the short side rails 150a, 150b can be transformed into a state in which they are bridged between the pillars, so that the work space is enclosed by the enclosure 140, and the worker can resume work at high altitude.

[0023] Next, a specific configuration of the short side rail 150a will be described. Note that the short side rail 150b has a similar configuration to the short side rail 150a, and therefore a description thereof will be omitted where appropriate. Fig. 4 is a perspective view showing a state in which the short-side rail 150a is bridged between the supporting posts, and Fig. 5 is a perspective view showing a state in which the short-side rail 150a is aligned with the supporting posts. The short side rail 150a is substantially bar-shaped and is an opening / closing member having a main body portion 151 and a grip portion 157. The main body 151 is formed to a length that allows it to span between the support 141a and the support 141b. The main body 151 is made of, for example, synthetic resin, and is formed by extrusion molding or injection molding. The main body 151 is a first color different from the top plate 110, for example, yellow. The main body 151 is a member having a substantially U-shaped or C-shaped cross section, and has a base 152 and a pair of side portions 153a, 153b. The base 152 is substantially plate-shaped along the longitudinal direction of the main body 151, and is located on the upper side when the short side rail 150a is spanned between the support columns, and overlaps with the support 141b when the short side rail 150a is along the support 141b. The pair of side portions 153a, 153b are substantially plate-shaped parallel to each other along the longitudinal direction of the main body 151, and are formed integrally with the main body 151 so as to be perpendicular to the main body 151. When the short side rail 150a is bridged between the pillars, the pair of side portions 153a, 153b are located at the front and rear of the base portion 152, and when the short side rail 150a is aligned along the pillar 141b, it overlaps with the pillar 141b.

[0024] 6(a) is a cross-sectional view of the short-side rail 150a along the support pillar 141b, cut substantially horizontally along line II in FIG. 5, and viewed from above. When the short-side rail 150a is along the support pillar 141b, the main body 151 overlaps with the support pillar 141b so as to surround the three side walls 161a to 161c of the support pillar 141b. Specifically, the base 152 of the main body 151 overlaps with the first side wall 161a in the left-right direction, and the pair of side parts 153a, 153b overlap with the second to third side walls 161b, 161c that are adjacent to the first side wall 161a in the front-rear direction. The first side wall 161a is the side wall of the support pillar 141b that faces the support pillar 141a. In this way, short-side crosspiece 150a overlaps so as to surround support 141b, so that short-side crosspiece 150a does not become bulky when it is aligned with support 141b. When short-side crosspiece 150a is aligned with support 141b, hook-and-loop fastener 173 attached to the back surface of main body 151 engages with hook-and-loop fastener 174 attached to the surface of side wall 161a of support 141b to prevent short-side crosspiece 150a from wobbling.

[0025] The main body 151 has an axis member 154 on the base end side and an engagement hole 155 as an engagement portion on the tip end side. The axis member 154 penetrates the pair of side portions 153a, 153b and the support 141b in the front-rear direction, and rotatably supports the main body 151. When the main body 151 rotates about the axis member 154, the short side crosspiece 150a is deformed between a state in which it is bridged between the supports and a state in which it is aligned with the support 141b. The engagement hole 155 is formed in the side portion 153a, and engages with an engagement protrusion 170 as an engaged portion provided on the support 141a. When the engagement hole 155 engages with the engagement protrusion 170, the short side crosspiece 150a is held in a state in which it is bridged between the support 141a and the support 141b. The base portion 152 of the main body 151 is cut out at the proximal and distal ends so that the short-side rail 150a does not interfere with the support posts 141a and 141b when the short-side rail 150a is stretched across the support posts.

[0026] 6(b) is a cross-sectional view of the short-side rail 150a in a state in which it is suspended between the supports, cut substantially horizontally along line II-II in FIG. 4 and viewed from above. When the short-side rail 150a is suspended between the supports, a pair of side portions 153a, 153b of the main body 151 are positioned to sandwich the support 141a from the front and rear, and the engagement hole 155 engages with the engagement protrusion 170. The engagement protrusion 170 has a substantially hemispherical tip and protrudes from the support 141a to the outside of the enclosure 140, specifically, from the side wall 161b of the support 141a toward the outside of the enclosure 140. The engagement protrusion 170 is movable forward and backward, and is biased by a biasing member 171 located inside the support 141a so as to protrude from the side wall 161b of the enclosure 140 to the outside of the enclosure 140. When the engagement hole 155 of the main body 151 and the engagement protrusion 170 are engaged, the user pushes the engagement protrusion 170 into the support 141a against the force of the biasing member 171, thereby disengaging the engagement hole 155 and the engagement protrusion 170.

[0027] Furthermore, the main body 151 has guide portions 156a and 156b in a substantially plate shape at the tip side. The guide portions 156a and 156b are formed integrally with the pair of side portions 153a and 153b, respectively. Specifically, the guide portions 156a and 156b protrude obliquely in directions away from each other from the ends of the pair of side portions 153a and 153b on the base portion 152 side. The guide portions 156a and 156b come into contact with the support 141a while the short side rail 150a is rotating around the shaft member 154 from a state in which it is aligned with the support 141b, thereby guiding the support 141a to be positioned between the side portions 153a and 153b. Furthermore, when short-side crosspiece 150a rotates around shaft member 154 from a state in which it is aligned with support pillar 141b, guide portion 156a comes into contact with the tip of engagement protrusion 170, and engagement protrusion 170 is pushed into support pillar 141a. By rotating short-side crosspiece 150a until the position of engagement protrusion 170 coincides with the position of engagement hole 155, engagement hole 155 and engagement protrusion 170 automatically engage with each other, and short-side crosspiece 150a is held in a state spanning support pillar 141a and support pillar 141b.

[0028] Grip portion 157 is a portion where a user grips short side rail 150a when rotating short side rail 150a. Grip portion 157 is made of, for example, synthetic resin, and formed by injection molding. Grip portion 157 is a member having a generally U-shaped or C-shaped cross section. Grip portion 157 is located on the tip side of main body portion 151, and is fixed to main body portion 151 in a state where it overlaps base portion 152 of main body portion 151 and a pair of side portions 153a, 153b from the outside. Here, of the short side rails 150a and 150b, only the short side rail 150a has been described. However, the short side rail 150b is configured to be point-symmetrical with respect to the center point O (see FIG. 3) where the center line C1 in the left-right direction of the top plate portion 110 and the center line C2 in the front-to-back direction intersect when viewed in a plane, and therefore detailed description thereof will be omitted.

[0029] The rotating unit 180 has a function of rotating the leg unit 130 relative to the top plate unit 110. By rotating the leg unit 130 via the rotating unit 180, the leg unit 130 changes between an open-leg posture in which the leg unit 130 supports the top plate unit 110 and a closed-leg posture in which the leg unit 130 overlaps the top plate unit 110 and is folded. Specifically, the rotating unit 180 has rotating bodies 181a and 181b. The rotating body 181a is disposed between the top plate unit 110 and the leg member 132a and between the top plate unit 110 and the leg member 132b. The rotating body 181b is disposed between the top plate unit 110 and the leg member 132a and between the top plate unit 110 and the leg member 132b.

[0030] The rotation restricting portion 190 has a function of restricting the rotation of the leg portion 130 relative to the top plate portion 110. Specifically, the rotation restricting portion 190 has rotation restricting bodies 191a and 191b. The rotation restricting body 191a is connected to the top plate portion 110 and the leg body 131a. Therefore, the rotation restricting body 191a restricts the rotation of the leg body 131a. The rotation restricting body 191b is connected to the top plate portion 110 and the leg body 131b. Therefore, the rotation restricting body 191b restricts the rotation of the leg body 131b.

[0031] The workbench 100 configured as described above can be folded when not in use and assembled when in use, so that the workbench 100 does not take up much space when stored or transported. Here, a method for folding the assembled workbench 100 will be described with reference to Figs. 7 to 12. First, the worker pushes in the engagement protrusions 170 of the supports 141a, 141d so as to sink them into the supports 141a, 141d, thereby releasing the engagement between the short-side rails 150a, 150b and the supports 141a, 141d, respectively. As shown in Fig. 7, the worker rotates the short-side rails 150a, 150b around the shaft member 154 to align them with the supports 141b, 141c. Next, as shown in FIG. 8, the worker separates the long side rails 144a, 144b approximately at the center, and rotates the separate members 145a to 145d around the shaft member 147, so that the separate members 145a to 145d are aligned with the supports 141a to 141d, as shown in FIG.

[0032] Next, as shown in Fig. 10, the worker rotates the supports 141a to 141d around an axis member (not shown) of the bracket 149. At this time, the supports 141a and 141d are rotated with the divided members 145a and 145d integrated together, and the supports 141b and 141c are rotated with the divided members 145b and 145c as well as the short side rails 150a and 150b integrated together. As shown in Fig. 11, the worker positions the supports 141a and 141b along the leg members 132a and 132b of the leg 131a, and positions the supports 141c and 141d along the leg members 132b and 132a of the leg 131b. Finally, as shown in FIG. 12, the worker can fold the workbench 100 by rotating the leg members 132a and 132b of the legs 131a and 131b via the rotating bodies 181a and 181b, respectively. Furthermore, to assemble the folded workbench 100, the steps for folding the workbench 100 are carried out in reverse order, thereby enabling the workbench 100 to be assembled.

[0033] According to the enclosure 140 of the workbench 100 configured as described above, the work space above the top plate 110 can be surrounded on all four sides by the long side rails 144a, 144b and the short side rails 150a, 150b. Therefore, when a worker is working in the work space, the worker can recognize that he or she is working near the end of the top plate 110 by contacting a part of the body with the long side rails 144a, 144b or the short side rails 150a, 150b. Since the worker can recognize the end of the top plate 110 in this way, the worker can work safely, and the worker can work more efficiently without having to check the end of the top plate 110.

[0034] Furthermore, the short side crosspieces 150a, 150b are not bridged across the long side crosspieces 144a, 144b, but are bridged across the supports 141a to 141b that support the long side crosspieces 144a, 144b. This reduces the wobbling of the short side crosspieces 150a, 150b caused by vibrations caused when a worker works at height, so the short side crosspieces 150a, 150b will not come loose from being bridged across the supports, improving the stability of the short side crosspieces 150a, 150b.

[0035] (Variation 1) In the above embodiment, the case where the work space is surrounded on all four sides by the long side rails 144a, 144b and the short side rails 150a, 150b has been described, but this is not limited to this case. For example, when working on a wall surface or the like of a work site, the workbench 100 is installed so that the end of the long side of the top plate portion 110 is close to the wall surface. In this case, if the work space is surrounded on all four sides, the long side rail 144a or the long side rail 144b becomes an obstacle, making it difficult to work on the wall surface or the like. Therefore, one of the long side rails 144a, 144b that is close to the wall surface is deformed to fit along the support columns 141a to 141d, so that the work space is surrounded on three sides, making it easy to work on the wall surface.

[0036] FIG. 13 is a perspective view of the workbench 100, showing a state in which the work space is surrounded on three sides. 13, the long side rail 144a (divided members 145a, 145c) is aligned with the supports 141a, 141c. Therefore, the long side rail 144b and the short side rails 150a, 150b surround the work space from three sides, and a worker can work on the wall surface from the side where the long side rail 144a was spanning. As described above, because gap G is formed between dividing member 145a and pillar 141a, short-side rail 150a can be deformed from a state surrounded on three sides to a state along pillar 141b, or from a state along pillar 141b to a state surrounded on three sides by bridging pillars 141a and 141b. Similarly, short-side rail 150b can be deformed from a state surrounded on three sides to a state along pillar 141c, or from a state along pillar 141c to a state surrounded on three sides by bridging pillars 141c and 141d.

[0037] (Variation 2) In the above-described embodiment, a case has been described in which the engagement protrusion 170 is biased so as to protrude from the support 141a toward the outside of the enclosing portion 140, but this is not limited to this case, and the engagement protrusion 170 may be configured to be biased so as to protrude from the support 141a toward the inside of the enclosing portion 140. Fig. 14 is a perspective view showing an example of the configuration of the engagement protrusion 170 and the short side rail 150a according to a modified example. Note that in Fig. 14, only the protruding direction of the engagement protrusion 170 and the direction of the engagement hole 155 are different from those in the above-mentioned embodiment, and therefore the same reference numerals as those in the above-mentioned embodiment are used.

[0038] 14, the engaging protrusion 170 is configured to be biased so as to protrude from the support 141a toward the inside of the enclosure 140. The engaging hole 155 of the short side rail 150a that engages with the engaging protrusion 170 is formed in the side portion 153b. Since the engaging protrusion 170 protrudes from the support 141a toward the inside of the enclosure 140 in this manner, an operator can easily push the engaging protrusion 170 into the support 141a from within the enclosure 140. The short side rail 150b and the support 141d can also be configured point-symmetrically with the short side rail 150a and the support 141a with respect to the center point O.

[0039] Second embodiment In the workbench 200 of the second embodiment, of the short side rails 250a, 250b, the short side rail 250a has a configuration similar to the short side rail 150a described above, while the short side rail 250b is integrated in a state in which it is bridged between the support pillars 241c and 241d, and is configured so that it cannot deform into a state along the support pillar 241c.

[0040] Fig. 15 is a diagram showing an example of the configuration of a workbench 200 according to the second embodiment. Fig. 16 is a diagram showing the workbench 200 as viewed from the front side. Fig. 17 is a diagram showing the workbench 200 as viewed from the rear side. The workbench 200 has a top panel 210, legs 230, an enclosure 240, a rotating section 280, and a rotation restricting section 290. The top panel 210 has a similar configuration to the top panel 110 of the first embodiment.

[0041] The leg section 230 has a pair of legs 231a and 231b. The legs 231a and 231b have leg members 232a and 232b and a plurality of cross members 238. The leg 231a has a similar configuration to the leg 131a of the first embodiment. On the other hand, the leg 231b is different from the leg 131b in that the number of cross members 238 is smaller and the inclination angle between the leg 231b and the floor surface is closer to a right angle than the leg 231a, and the leg 231a is in contact with the floor surface. The leg 231a of this embodiment is used by an operator to ascend and descend between the top plate 210 and the floor surface, while the leg 231b is not intended for an operator to ascend and descend, and the workbench 200 can be installed so that the leg 231b is close to the wall surface.

[0042] The enclosure 240 has support posts 241a to 241d, a pair of long side rails 244a, 244b, and a pair of short side rails 250a, 250b. The pillars 241a to 241d are each disposed substantially vertically at the corners of the top plate portion 210. The pillars 241a and 241b are located at both ends of one short side of the top plate portion 210, and the pillars 241c and 241d are located at both ends of the other short side of the top plate portion 210. The pillars 241a and 241b are each connected to brackets 249 fixed to the upper ends of the leg members 232a and 232b so as to be rotatable in the R1 direction, and the pillars 241c and 241d are each connected to brackets 249 fixed to both the left and right sides of the top plate portion 210 so as to be rotatable in the R2 direction.

[0043] The long side rails 244a and 244b are disposed on the upper side of the long side end of the outer periphery of the top plate portion 210. The long side rails 244a and 244b have the same configuration as the long side rails 144a and 144b of the first embodiment. The long side rail 244a has a pair of divided members 245a and 245c, and the long side rail 244b has a pair of divided members 245b and 245d. The divided members 245a to 245d rotate around the shaft members of the bracket 246 fixed to the upper ends of the pillars 241a to 241d, respectively, to rotate from a substantially horizontal state to a state along the pillars 241a to 241d. The divided members 245a to 245d have the same configuration as the divided members 145a to 145d of the first embodiment.

[0044] The short side rails 250a and 250b are disposed on the upper side of the short end of the outer periphery of the tabletop 210. The short side rail 250a has the same configuration as the short side rail 150a of the first embodiment. That is, the short side rail 250a can be deformed from a state in which it is bridged between the support 241a and the support 241b to a state in which it is aligned with the support 241b. Therefore, by deforming the short side rail 250a to a state in which it is aligned with the support 241b, it is possible to move between the tabletop 210 and the floor surface through the leg 231a. On the other hand, unlike the short side rail 150b of the first embodiment, the short side rail 250b is integrated in a state in which it is bridged between the support 241c and the support 241d, and cannot be deformed to a state in which it is aligned with the support 241c.

[0045] The rotating section 280 has rotating bodies 281a and 281b. The rotating body 281a is disposed between the top panel 210 and the leg member 232a and between the top panel 210 and the leg member 232b. The rotating body 281b is disposed between the top panel 210 and the leg member 232a and between the top panel 210 and the leg member 232b. The rotating section 280 has the same configuration as the rotating section 180 of the first embodiment.

[0046] The rotation restricting portion 290 has rotation restricting bodies 291a and 291b. The rotation restricting body 291a is connected to the top plate portion 210 and the leg body 231a. The rotation restricting body 291a restricts the rotation of the leg body 231a. The rotation restricting body 291b is connected to the top plate portion 210 and the leg body 231b. The rotation restricting body 291b restricts the rotation of the leg body 231b. The rotation restricting portion 290 has a similar configuration to the rotation restricting portion 190 of the first embodiment.

[0047] A method for folding the assembled workbench 200 will now be described with reference to FIG. First, the worker releases the engagement between the short-side rail 250a and the support pillar 241a in the same manner as in the first embodiment. The worker rotates the short-side rail 250a so that it is aligned with the support pillar 241b. Next, the worker separates the long side rails 244a, 244b approximately at the center, and rotates the separate members 245a to 245b so that the separate members 245a to 245d are aligned with the supports 241a to 241d.

[0048] 18, the worker rotates the supports 241a, 241b together with the dividing members 245a, 245b and the short-side rail 250a in the R1 direction to align them with the leg members 232a, 232b, respectively. Meanwhile, because the supports 241c, 241d are integrated with the short-side rail 250b, the worker rotates the supports 241c, 241d and the short-side rail 250b in the R2 direction to overlap the short-side rail 250b on the top panel portion 210. Finally, the worker can fold the workbench 200 by rotating the leg members 232a, 232b of the legs 231a, 231b via the rotating bodies 281a, 281b, respectively. Furthermore, to assemble the folded workbench 200, the steps for folding the workbench 200 are carried out in reverse order, thereby enabling the workbench 200 to be assembled.

[0049] According to the workbench 200 configured as described above, only one of the short side rails 250a, 250b, that is, the short side rail 250a, can be deformed from a state in which it is bridged between the support pillars 241a and 241b to a state in which it is aligned with the support pillar 241b.

[0050] While the present invention has been described above with reference to the above-described embodiments, the present invention is not limited to the above-described embodiments, and the above-described embodiments and variations can be appropriately combined or modified within the scope of the present invention. In the first embodiment described above, the main body 151 of the short side rail 150a has a base 152 and a pair of side portions 153a, 153b. However, the main body 151 may have any one of the base 152, the side portion 153a, and the side portion 153b, or may have the base 152 and the side portion 153a, or may have the base 152 and the side portion 153b.

[0051] In the first embodiment described above, the case where the long side rails 144a and 144b are each separable has been described, but this is not limited to this case. The long side rails 144a and 144b may be extendable. For example, the long side rails 144a and 144b may be rotatable with respect to the upper ends of the supports 141a and 144d, and the long side rails 144a and 144b may be extended and their tips may be hooked to the upper ends of the supports 141c and 141b, respectively, to bridge between the supports. Alternatively, the long side rails 144a and 144b may be rotatable with respect to the upper ends of the supports 141b and 144c, and the long side rails 144a and 144b may be extended and their tips may be hooked to the upper ends of the supports 141d and 141a, respectively, to bridge between the supports. In this embodiment, we have described a case where the short side rails 150a, 150b, 250a can be transformed into a state where they are aligned along the pillars and a state where they are spanned between the pillars. However, this is not limited to this case, and they can be changed as appropriate depending on the issues, etc. [Explanation of symbols]

[0052] 100, 200: Portable workbench 110, 210: Top plate 131a, 131b, 231a, 231b: Legs 141a to 141d, 241a to 241d: Supports 150a, 150b, 250a, 250b: Short side rails 151: Main body 152: Base 153a, 153b: Sides 155: Engagement holes 170: Engagement protrusions

Claims

1. A rectangular top plate portion having a pair of long sides and a pair of short sides; A first leg body arranged on one of the pair of short sides; A second leg body arranged on the other short side of the pair of short sides; A pair of first support columns are arranged along the up-down direction at both ends of the one short side; a first bar that is deformable between a state along one of the pair of first columns and a state spanning the pair of columns; The one support pillar has a first side wall facing the other support pillar, A workbench characterized in that the first bar has a base that overlaps the first side wall when aligned along the one of the supports.

2. 2. The workbench according to claim 1, wherein the first bar overlaps the one of the columns when aligned along the one of the columns.

3. the one support pillar has a second side wall and a third side wall adjacent to and perpendicular to the first side wall; 3. The workbench according to claim 1, wherein the first bar has a pair of sides that overlap the second side wall and the third side wall when aligned along the first support.

4. the first bar has an axial member located at one end in a longitudinal direction and an engagement portion located at the other end in a longitudinal direction, and is deformable between a state along the one of the columns and a state spanned between the pair of columns by rotating about the axial member relative to the one of the columns; A workbench as described in any one of claims 1 to 3, characterized in that the engaging portion engages with the engaged portion of the other support, thereby holding the first bar in a spanning state between the pair of support pillars.

5. The engaged portion protrudes from a side wall of the other support pillar so as to be movable forward and backward. The workbench according to claim 4 , wherein the engaging portion engages with the engaged portion.

6. A rectangular top plate portion having a pair of long sides and a pair of short sides; A first leg body arranged on one of the pair of short sides; A second leg body arranged on the other short side of the pair of short sides; A pair of first support columns are arranged along the up-down direction at both ends of the one short side; a first bar that is deformable between a state along one of the pair of first columns and a state spanning the pair of columns; A pair of second support columns are arranged along the up-down direction at both ends of the other short side; a second bar that is deformable between a state in which it is aligned with the other of the pair of first columns and a state in which it is bridged between one of the pair of second columns and the other of the pair of first columns; A workbench characterized in that the first bar is spanned between the pair of first supports with a portion of the first bar positioned in the gap formed between the second bar and the other of the pair of first supports when the second bar is aligned along the other of the pair of first supports.

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