Handrail and Platform Systems

Abstract

To reduce the types of a handrail.SOLUTION: The present invention relates to a handrail 31 that is mounted to an edge of a top plate part 110 of a working platform 100 and has horizontal frame parts 38 capable of extending in the longitudinal direction. In addition, the horizontal frame parts 38 each have a stopper part 43 that makes its extension gradually stop when extending in the longitudinal direction.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a handrail and work platform system. [Background technology]

[0002] Temporary handrails have been used at work sites for some time. Patent Document 1 discloses a temporary handrail mounting device that mounts a safety handrail post via a ring to a cylindrical body fixed upright on a steel beam or the like. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-13690 Summary of the Invention [Problem to be solved by the invention]

[0004] When attaching handrails to the ends of a workbench, different types of handrails must be prepared depending on the length of the end of the workbench, which results in an increase in the number of types of handrails. The present invention has been made in consideration of the above-mentioned problems, and has an object to reduce the number of types of handrails. [Means for solving the problem]

[0005] The present invention relates to a handrail attached to the end of a workbench top plate, the handrail having a horizontal frame portion that is extendable in the longitudinal direction, the horizontal frame portion being a first horizontal frame having two end frame members and an intermediate frame member. and a second horizontal frame that is extendable and contractable in a stepwise manner in the longitudinal direction; The present invention is characterized by comprising: Effect of the Invention

[0006] According to the present invention, the number of types of handrails can be reduced. [Brief description of the drawings]

[0007] [Figure 1A] 1 is a plan view showing an example of the configuration of a workbench system according to a first embodiment. [Figure 1B] FIG. 1 is a front view showing an example of a configuration of a workbench system. [Figure 1C] FIG. 2 is a side view showing an example of the configuration of the workbench system. [Diagram 2] FIG. 1 is a perspective view showing an example of a configuration of a workbench system. [Diagram 3] FIG. 1 is a perspective view showing an example of a configuration of a workbench system. [Figure 4] FIG. 2 is a diagram showing an example of a configuration of a workbench. [Diagram 5] FIG. 2 is a diagram showing an example of the configuration of a bridge cart. [Figure 6] FIG. 2 illustrates an example of a bridge configuration. [Figure 7] FIG. 1 is a diagram illustrating an example of a configuration of a handrail. [Figure 8] FIG. 2 is a perspective view showing an example of a configuration of a handrail. [Figure 9] 13 is a diagram showing an example of a case where a horizontal frame portion is expanded or contracted. FIG. [Figure 10] FIG. 13 is a diagram for explaining a method for attaching a handrail. [Figure 11] 4 is a cross-sectional view showing an example of the configuration of the handrail and the tabletop portion. FIG. [Figure 12] FIG. 11 is a diagram for explaining a method for attaching a handrail according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, a handrail and work platform system according to this embodiment will be described with reference to the drawings. (First embodiment) FIG. 1A is a plan view showing an example of the configuration of a workbench system 10. FIG. 1B is a front view of the configuration of the workbench system 10 as viewed from the front side. FIG. 1C is a side view of the configuration of the workbench system 10 as viewed from the left side. FIG. 2 is a perspective view of a part of the workbench system 10 as viewed from the left side. FIG. 3 is a perspective view of a part of the workbench system 10 as viewed from the front side. For ease of explanation, in each drawing, 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 front-rear direction and the left-right direction are approximately perpendicular to each other.

[0009] The work platform system 10 is composed of multiple types of components such as a predetermined number of work platforms 100, a predetermined number of bridge carts 200, a predetermined number of bridges 300, a handrail section 30, and a ladder section 60. By connecting a predetermined number of work platforms 100, a predetermined number of bridge carts 200, and a predetermined number of bridges 300, a wide, approximately rectangular work plane is formed on which workers can work at height. The workbench system 10 of this embodiment has nine workbenches 100 (100a to 100i), six (six) bridge dollies 200 (200a to 200f), and 30 bridges 300, which are specific quantities forming a substantially rectangular work plane. The work plane of this embodiment has a length in the front-rear direction of, for example, 7700 mm to 7900 mm, and a length in the left-right direction of, for example, 5000 mm to 6100 mm. The size of such a work plane is a dimension that allows the work plane to fit between pillars located on a floor when the work site is a building.

[0010] The nine work tables 100a-100i each have the same configuration, and when there is no need to distinguish between them, they will be simply referred to as work tables 100 below. The six bridge carts 200a-200f each have the same configuration, and when there is no need to distinguish between them, they will be simply referred to as bridge carts 200 below. The 30 bridges 300 each have the same configuration.

[0011] Specifically, the workbench system 10 is composed of three row units 20a-20c arranged along the front-rear direction, each of which is made up of a workbench 100 and a bridge cart 200. The row units 20a-20c are the basis for constructing the workbench system 10. The three row units 20a-20c are arranged in the order of the workbench 100, the bridge cart 200, the workbench 100, the bridge cart 200, and the workbench 100 from the rear to the front. In this embodiment, in a plan view, the workbench 100 and the bridge cart 200 are approximately the same in size and are approximately rectangular in shape with the front-rear direction (longitudinal direction) being longer than the left-right direction (shortitudinal direction). More specifically, the workbench 100 and the bridge cart 200 have a ratio of the length in the front-rear direction to the length in the left-right direction of approximately 3:2.

[0012] The workbench system 10 is configured by bridging a plurality of bridges 300 between three row units 20a to 20c arranged in parallel with a gap in the left-right direction. In this embodiment, the bridge 300 is substantially rectangular in shape with the front-rear direction (short side direction) shorter than the left-right direction (long side direction) in a plan view. More specifically, the ratio of the length of the bridge 300 in the front-rear direction to the length in the left-right direction is approximately 1:3. The length of the workbench 100 and the bridge cart 200 in the front-rear direction and the length of the bridge 300 in the left-right direction are approximately the same, and the ratio of the length of the workbench 100 and the bridge cart 200 in the front-rear direction to the length of the bridge 300 in the front-rear direction is approximately 3:1. Therefore, three bridges 300 can be bridged between the workbenches 100 arranged apart from each other, and three bridges 300 can be bridged between the bridge carts 200 arranged apart from each other. As a result, fifteen bridges 300 are arranged between the row unit 20a and the row unit 20b, and fifteen bridges 300 are arranged between the row unit 20b and the row unit 20c.

[0013] The handrail section 30 is attachable and detachable, and surrounds the outer periphery of the work plane by being attached along the outer periphery of the work plane. When a worker works on the work plane, part of the worker's body comes into contact with the handrail section 30, allowing the worker to recognize that he or she is at the edge of the work plane. The handrail section 30 has multiple handrails. The handrail section 30 of this embodiment has a handrail 31 with a first horizontal length and a handrail 32 with a second horizontal length. However, the handrails 31 and 32 have the same configuration, being each formed by extending or shortening a horizontal frame section 38 (described later) in the horizontal direction. The handrail 31 can be transformed into the handrail 32 by shortening the horizontal frame section 38, and the handrail 32 can be transformed into the handrail 31 by lengthening the horizontal frame section 38. The handrail section 30 has 13 handrails 31 and 7 handrails 32 as the specific numbers surrounding the outer periphery of the work plane.

[0014] The handrail 31 has a length, in plan view, that is approximately the same as the longitudinal length of the work platform 100, the bridge cart 200, and the bridge 300. The handrail 31 is attached to the longitudinal end of each of the work platform 100, the bridge cart 200, and the bridge 300 that are located on the periphery of the work plane. However, in the work platform 100c shown in Fig. 1A, handrail 32 is attached instead of handrail 31 in order to attach the ladder section 60 to the longitudinal end. Moreover, in a plan view, the handrail 32 has a length that is approximately the same as the length in the short direction of the work platform 100 and the bridge cart 200. The handrail 32 is attached to the short end portion of each of the work platform 100 and the bridge cart 200 that are located on the outer periphery of the work plane.

[0015] The ladder section 60 is attached to the outer periphery of the work surface to enable a worker to ascend and descend between the work surface and the floor surface. The workbench system 10 of this embodiment specifically has one ladder unit 60. The ladder unit 60 has a length that is appropriately shorter than the short-side lengths of the workbench 100 and the bridge 300 in a plan view. The ladder unit 60 is attached to the long-side end or the short-side end of the workbench 100, the bridge cart 200, or the bridge 300 that are located on the outer periphery of the work plane.

[0016] Next, the configuration of the workbench 100 will be described with reference to Fig. 4. Fig. 4 is a plan view, a front view, and a side view showing an example of the configuration of the workbench 100. The workbench 100 has a top plate portion 110 , legs 130 , a rotating portion 150 , and a running portion 180 . The top plate 110 serves as a foothold for workers working at height. In plan view, the top plate 110 has a generally rectangular shape that is long in the front-rear direction. In this embodiment, the length of the top plate 110 in the front-rear direction (longitudinal direction) is, for example, approximately 1550 mm, and the length in the left-right direction (shortitudinal direction) is, for example, approximately 1010 mm. The top plate 110 is also, for example, approximately 1000 mm to approximately 1500 mm high from the floor surface. Note that the length of the top plate 110 in the front-rear direction and the left-right direction may be approximately equal.

[0017] The top plate portion 110 has a number of projections for preventing slipping on the surface that becomes the work surface. The top plate portion 110 also has a connecting bar 114 at a position close to the outer periphery. The top plate portion 110 also has a number of connecting holes 118 at a position close to the outer periphery. The connecting holes 118 are located at the end on the long side (first end) and the end on the short side (second end) of the top plate portion 110. For example, six connecting holes 118 are formed at the end on the long side, and four connecting holes 118 are formed at the end on the short side. The connecting holes 118 are holes for connecting to the connecting pins 221 of the bridge dolly 200, the connecting pins 321 of the bridge 300, or the connecting bars 114 of another work table 100 when the other work table 100 is placed directly adjacent to the other work table 100. The top plate portion 110 also has a number of handrail holes 125 for attaching the handrail portion 30 at positions close to the outer periphery. The handrail holes 125 are located at the end on the long side (first end) and the end on the short side (second end) of the top plate portion 110. For example, six handrail holes 125 are formed at the end on the long side, and two handrail holes 125 are formed at the end on the short side. Note that FIG. 4 illustrates only two handrail holes 125 for attaching the handrail 31 to the end on the long side of the top plate portion 110. Here, the pitch of the two handrail holes 125 at the end on the short side is different from the pitch of the two handrail holes 125 at the end on the long side.

[0018] The legs 130 serve to support the weight of the tabletop 110 and the weight of a worker working on the tabletop 110. The legs 130 are connected to the underside of the tabletop 110 and are rotatable relative to the tabletop 110. When the legs 130 rotate, the legs 130 are folded so as to overlap the tabletop 110. Specifically, the legs 130 have four leg members 131a to 131d. Note that in FIG. 4, the leg member 131b is not shown because it is hidden by the leg members 131a and 131d. The leg members 131a to 131d extend from positions close to the four corners of the tabletop 110 toward the floor surface.

[0019] In addition, a cross member 137 is horizontally disposed between leg members 131a and 131b and between leg members 131c and 131d. By disposing cross member 137 between leg members 131a and 131b and between leg members 131c and 131d, leg members 131a and 131b are configured as one unit, i.e., a first leg body, and leg members 131c and 131d are configured as one unit, i.e., a second leg body. Therefore, when leg portion 130 rotates relative to top plate portion 110, leg members 131a and 131b rotate together, and leg members 131c and 131d rotate together. The leg members 131a and 131b, and the leg members 131c and 131d can be extended and retracted stepwise in the height direction.

[0020] In addition, in the workbench 100 of this embodiment, the legs 130 do not extend completely vertically in the open-legged position, but are inclined relative to the vertical to improve stability. That is, when the workbench 100 is viewed in the left-right direction, the pair of legs are inclined away from each other as they move from the upper end to the lower end.

[0021] The rotating unit 150 plays a role in rotating the leg unit 130 with respect to the top plate 110. By rotating the leg unit 130 with respect to the top plate 110 via the rotating unit 150, the leg unit 130 changes between 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 plate 110 and is folded. Specifically, the rotating unit 150 has four rotating bodies 151a to 151d. Note that the rotating bodies 151b and 151d are not shown in FIG. 4 because they are hidden by the rotating bodies 151a and 151c, respectively. The rotating bodies 151a to 151d are disposed between the leg members 131a to 131d and the top plate 110, respectively. Here, the rotation fulcrum P1 of the rotating bodies 151a and 151b is positioned above the rotation fulcrum P2 of the rotating bodies 151c and 151d, that is, offset toward the top panel portion 110.

[0022] The running unit 180 plays a role of moving the workbench 100 to an arbitrary position while supporting the top plate unit 110 and the leg unit 130. The running unit 180 is connected to the underside of the leg unit 130. Specifically, the running unit 180 has four casters 181a to 181d. In FIG. 4, the caster 181b is not shown because it is hidden by the casters 181a and 181d. The casters 181a to 181d are rotatably connected to the lower ends of the leg members 131a to 131d, respectively. In addition, the casters 181a to 181d are each a caster with a stopper that can fix the rotation of the wheels according to the operation of the worker. When the worker works at a high place, the worker can safely work at a high place without moving the workbench 100 by operating the pedals of the casters 181a to 181d of the running unit 180 to fix the rotation of the wheels.

[0023] Next, the configuration of the bridge cart 200 will be described with reference to Fig. 5. Fig. 5 is a plan view, a front view, and a side view showing an example of the configuration of the bridge cart 200. The bridge cart 200 is bridged over the top plate portions 110 of the work platforms 100 that are arranged at a distance in the front-rear direction. The bridge cart 200 not only serves as a scaffold for performing high-altitude work, but also functions as a transport cart capable of carrying the components of the work platform system 10. The bridge cart 200 corresponds to an example of a first bridge.

[0024] The bridge cart 200 has a main body portion 210 and a running portion 230 . The main body 210 serves as a foothold for workers working at height. The main body 210 also serves as a loading section for loading the work platform 100 when the bridge cart 200 is made to function as a transport cart. The main body 210 is substantially rectangular in shape with a long front-rear direction in plan view. In this embodiment, the length of the main body 210 in the front-rear direction (longitudinal direction) is, for example, approximately 1550 mm, and the length in the left-right direction (shortitudinal direction) is, for example, approximately 1010 mm. The size of the main body 210 of the bridge cart 200 and the size of the top plate 110 of the work platform 100 are substantially the same. However, the size of the main body 210 and the size of the top plate 110 are not limited to being substantially the same. The length of the main body 210 in the front-rear direction and the left-right direction may be substantially the same.

[0025] The main body 210 has multiple anti-slip projections on the surface that serves as the work surface. The main body 210 also has multiple connection holes 218 at positions close to the outer periphery. For example, six connection holes 218 are formed at the end on the longitudinal side. The connection holes 218 are holes for connection to connection pins 321 of the bridge 300. The main body 210 also has a number of handrail holes 225 for attaching the handrail section 30 at a position close to the outer periphery and at the end on the longitudinal side. For example, six handrail holes 225 are formed at the end on the longitudinal side. Note that Fig. 5 only illustrates two handrail holes 225 for attaching the handrail 31 at the end on the longitudinal side of the main body 210. Here, the pitch of the two handrail holes 225 at the end on the longitudinal side shown in Fig. 5 is approximately the same as the pitch of the two handrail holes 125 at the end on the longitudinal side shown in Fig. 4. The main body 210 also has a connecting pin 221 at the short end which is the side connected to the workbench 100. Specifically, the connecting pin 221 is provided at each of the ends (front end and rear end) of the short side. The connecting pin 221 is attached to a plate-shaped bracket 222 which extends from the ends (front end and rear end) of the short side of the main body 210 toward the front and rear, respectively. The connecting pin 221 protrudes downward from the lower surface of the bracket 222. The bridge cart 200 and the workbench 100 are connected to each other by inserting the connecting pins 221 into the connecting holes 118 of the workbench 100 from above. Here, the connecting pin 221 and the bracket 222 correspond to an example of a connecting portion.

[0026] The running unit 230 plays a role of running on the floor surface while supporting the load of the main body 210 and the cargo when the bridge cart 200 functions as a transport cart. The running unit 230 is on the underside of the main body 210 and has a plurality of (four) casters 231a to 231d arranged at the four corners. Note that the caster 231b is not shown in FIG. 5 because it is hidden by the casters 231a and 231d. The casters 231a to 231d are attached to the underside of the main body 210. The casters 231a to 231d are rotatable around the axis of a rotation shaft O that is aligned in the vertical direction. In Fig. 5, the wheels 233 are oriented in the front-to-rear direction, but by rotating the wheels 233 around the axis of the rotation shaft O, the bridge cart 200 can travel in any direction including front-to-rear, left-to-right, and not limited to the front side.

[0027] The casters 231a to 231d are brake-equipped casters that can apply or release the brakes according to the operation of the worker. Specifically, the casters 231a to 231d have wheels 233, fork members 234 as support parts, and a brake pedal 235. The fork members 234 rotatably support the wheels 233. The brake pedal 235 can swing up and down relative to the fork members 234. The brake pedal 235 has an operating part 236 at its tip to be stepped on with the foot. When the worker operates the operating part 236 to step on the lower side during braking, the outer circumferential surface of the wheel 233 is pressed, and the wheel 233 is braked. When the worker further steps on the operating part 236, the wheel 233 is held in a braked state.

[0028] 5 shows a state where the brake is not applied (a state where the brake is released). As shown in FIG. 5, the casters 231a and 231b, which are on the rear side when the bridge cart 200 is traveling, have the operation part 236 of the brake pedal 235 located rearward of the rear end of the main body part 210 and exposed. Furthermore, when the brakes are released and the wheels 233 are facing forward and backward, the operating unit 236 is positioned so as not to overlap with the connecting pin 221 and the bracket 222 in a plan view. Therefore, when it is necessary to apply the brakes, the operator can easily depress the operating unit 236 without being interfered with by the connecting pin 221 and the bracket 222.

[0029] Next, the configuration of the bridge 300 will be described with reference to Fig. 6. Fig. 6 is a plan view, a front view, and a side view showing an example of the configuration of the bridge 300. The bridge 300 is spanned across the top plate portions 110 of the workbenches 100 that are spaced apart in the left-right direction. The bridge 300 is also spanned across the main body portions 210 of the bridge carts 200 that are spaced apart in the left-right direction. The bridge 300 corresponds to an example of a second bridge.

[0030] The bridge 300 has a body portion 310 . The main body 310 serves as a foothold for workers working at height. The main body 310 has a generally rectangular shape that is long in the left-right direction in a plan view. In this embodiment, the length of the main body 310 in the front-rear direction (short side direction) is, for example, about 500 mm, and the length in the left-right direction (short side direction) is, for example, about 1530 mm. Note that the length of the main body 310 in the front-rear direction and the left-right direction may be generally equal.

[0031] The main body 310 has a plurality of projections for preventing slipping on the surface that becomes the working surface. The main body 310 also has a plurality of handrail holes 325 for attaching the handrail part 30 at the end of the longitudinal side in a position close to the outer periphery. For example, six handrail holes 325 are formed at the end of the longitudinal side. Note that FIG. 6 illustrates only two handrail holes 325 for attaching the handrail 31 at the end of the longitudinal side of the main body 310. Here, the pitch of the two handrail holes 325 at the end of the longitudinal side shown in FIG. 6 is approximately the same as the pitch of the two handrail holes 225 at the end of the longitudinal side shown in FIG. 5 and the pitch of the two handrail holes 125 at the end of the longitudinal side shown in FIG. 4.

[0032] The main body 310 also has a connecting pin 321 at the short end, which is the side that is connected to the workbench 100 or the bridge cart 200. Specifically, the connecting pin 321 is provided at each of the short end portions (right end portion and left end portion). The connecting pin 321 is attached to a plate-shaped bracket 322 that extends from the short end portions (right end portion and left end portion) of the main body 310 toward the right side and left side, respectively. The connecting pin 321 protrudes downward from the lower surface of the bracket 322. The connecting pin 321 is connected to the workbench 100 or the bridge cart 200 by inserting it from above into the connecting hole 118 of the workbench 100 or the connecting hole 218 of the bridge cart 200, respectively. Here, the connecting pin 321 and the bracket 322 correspond to an example of a connecting portion.

[0033] Next, the configuration of the handrail section 30 will be described with reference to Figures 7 to 9. Note that since the handrails 31 and 32 are the same type with only the horizontal frame section 38 being extended or contracted, the handrails 31 and 32 will not be distinguished from each other and will be described as the handrail 31. In the following, the handrail 31 will be mainly described as being attached to the top plate section 110 of the work platform 100, but the same applies to the case where the handrail 31 is attached to the main body section 210 of the bridge dolly 200 or the main body section 310 of the bridge 300. Fig. 7(a) to (c) are a plan view, a front view, and a side view of the handrail 31. Fig. 7(b) is a view of the handrail 31 seen from the working area. The working area refers to the space above the working plane, which overlaps with the working plane in a plan view. Fig. 8 is a perspective view in which a part of the handrail 31 is exploded.

[0034] The handrail 31 has a vertical frame portion 34, a horizontal frame portion 38, a contact member 56, an insertion pin 70, etc. The vertical frame portion 34 supports the horizontal frame portion 38. The vertical frame portion 34 in this embodiment has a first vertical frame 35a and a second vertical frame 35b. The first vertical frame 35a and the second vertical frame 35b are generally rod-shaped and extend linearly in a generally vertical direction perpendicular to the horizontal direction. In this embodiment, the length of the first vertical frame 35a and the second vertical frame 35b is, for example, about 1000 mm. When the handrail 31 is attached to the tabletop portion 110, the height from the surface of the tabletop portion 110 to the upper ends of the first vertical frame 35a and the second vertical frame 35b is, for example, about 800 mm to about 1000 mm. The first vertical frame 35a and the second vertical frame 35b each have an upper support member 36 that supports the upper horizontal frame 39a and the central horizontal frame 39b, and a lower support member 37 that supports the lower horizontal frame 39c. The upper support member 36 and the lower support member 37 are fixed to each other so as to be aligned substantially in the vertical direction. In this embodiment, the length of the upper support member 36 is longer than the length of the lower support member 37.

[0035] The upper support member 36 and the lower support member 37 have, for example, a hollow, substantially rectangular cross section. Here, the upper support member 36 and the lower support member 37 are made of different materials, and the upper support member 36 is made of a material that is more flexible than the lower support member 37. The upper support member 36 has lower rigidity than the lower support member 37. Specifically, the upper support member 36 is made of, for example, a synthetic resin, and the lower support member 37 is made of, for example, an aluminum alloy. The lower support member 37 is fixed by screws, rivets (including blind rivets), etc., with its outer periphery fitted into the upper support member 36. At this time, the length Ov (see FIG. 7(c)) by which the upper support member 36 and the lower support member 37 overlap each other is shorter than half the length of the upper support member 36, and further shorter than ¼ the length of the upper support member. However, the first vertical frame 35a and the second vertical frame 35b may each be configured from a single member. In this case, the first vertical frame 35a and the second vertical frame 35b may be made of a material that is more flexible than the top plate portion 110, such as synthetic resin. The first vertical frame 35a and the second vertical frame 35b are disposed with a gap therebetween. Protective caps made of synthetic resin are attached to the upper ends of the first vertical frame 35a and the second vertical frame 35b. The vertical frame portion 34 is not limited to being composed of two components, the first vertical frame 35a and the second vertical frame 35b, but may be composed of one component, or three or more components.

[0036] The horizontal frame portion 38 is supported by the vertical frame portion 34 and surrounds a part of the working space from the side. The horizontal frame portion 38 of this embodiment is extendable in the horizontal direction (longitudinal direction). The horizontal frame portion 38 of this embodiment has an upper horizontal frame 39a, a central horizontal frame 39b, and a lower horizontal frame 39c. The upper horizontal frame 39a is supported by a first vertical frame 35a and a second vertical frame 35b that are spaced apart from each other. The upper horizontal frame 39a is generally rod-shaped and extends linearly in the horizontal direction. The upper horizontal frame 39a is fixed to the upper end of the vertical frame portion 34. In addition, protective caps made of synthetic resin are attached to both ends of the upper horizontal frame 39a.

[0037] The center horizontal frame 39b is supported by the first vertical frame 35a and the second vertical frame 35b, which are spaced apart from each other. The center horizontal frame 39b is generally rod-shaped and extends linearly in the horizontal direction. The center horizontal frame 39b is fixed at a position lower than the upper ends of the first vertical frame 35a and the second vertical frame 35b. The center horizontal frame 39b is located lower than the upper horizontal frame 39a and higher than the lower horizontal frame 39c. Protective caps made of synthetic resin are attached to both ends of the center horizontal frame 39b.

[0038] Here, the upper horizontal frame 39a and the central horizontal frame 39b are extendable in the horizontal direction. The upper horizontal frame 39a and the central horizontal frame 39b each have two end frame members 40a, 40b and an intermediate frame member 41. The two end frame members 40a, 40b are located on both sides in the horizontal direction, and the intermediate frame member 41 is located between the two end frame members 40a, 40b. The end frame members 40a, 40b and the intermediate frame member 41 each have, for example, a hollow, generally rectangular cross section. Here, the end frame members 40a, 40b and the intermediate frame member 41 are made of the same material, which is more flexible than the top plate portion 110. Specifically, the end frame members 40a, 40b and the intermediate frame member 41 are made of, for example, a synthetic resin. However, the end frame members 40a, 40b and the intermediate frame member 41 may be made of different materials, and the end frame members 40a, 40b may be made of a material that is more flexible than the intermediate frame member 41, or the intermediate frame member 41 may be made of a material that is more flexible than the end frame members 40a, 40b. Also, the end frame members 40a, 40b may have lower rigidity than the intermediate frame member 41, or the intermediate frame member 41 may have lower rigidity than the end frame members 40a, 40b. Specifically, the end frame members 40a, 40b may be made of, for example, synthetic resin or aluminum alloy, and the intermediate frame member 41 may be made of, for example, aluminum alloy or synthetic resin.

[0039] Both ends of the intermediate frame member 41 are fitted into the end frame members 40a and 40b, respectively. The intermediate frame member 41 can slide horizontally relative to the end frame members 40a and 40b while being fitted into the end frame members 40a and 40b. That is, the upper horizontal frame 39a and the center horizontal frame 39b can expand and contract horizontally by changing the overlapping length between the intermediate frame member 41 and the end frame members 40a and 40b. The horizontal lengths of the upper horizontal frame 39a and the center horizontal frame 39b can be expanded and contracted to any length from a first length (L1) to a second length (L2). The first length corresponds to the length of the top plate portion 110 in the longitudinal direction, and the second length corresponds to the length of the top plate portion 110 in the lateral direction. In this embodiment, the first length is approximately 1360 mm, and the second length is approximately 940 mm. When the horizontal length of the upper horizontal frame 39a and the central horizontal frame 39b is the first length, the overlapping length between the middle frame member 41 and the end frame members 40a, 40b is small, so that the middle frame member 41 is exposed to a large extent. On the other hand, when the horizontal length of the upper horizontal frame 39a and the central horizontal frame 39b is the second length, the overlapping length between the middle frame member 41 and the end frame members 40a, 40b is large, so that the middle frame member 41 is exposed to a small extent. In this embodiment, when the horizontal length of the upper horizontal frame 39a and the central horizontal frame 39b is the second length, the end frame members 40a, 40b abut against each other, so that the middle frame member 41 is hidden by the end frame members 40a, 40b.

[0040] The upper horizontal frame 39a and the center horizontal frame 39b are fixed to the first vertical frame 35a and the second vertical frame 35b in a state in which they cross the first vertical frame 35a and the second vertical frame 35b. As shown in FIG. 7(b), when viewed from a direction perpendicular to the vertical and horizontal directions, both ends of the upper horizontal frame 39a and the center horizontal frame 39b are located outside the first vertical frame 35a and the second vertical frame 35b. That is, the ends of the upper horizontal frame 39a and the center horizontal frame 39b are not located between the first vertical frame 35a and the second vertical frame 35b, but protrude beyond the first vertical frame 35a and the second vertical frame 35b in the horizontal direction. In this embodiment, the protrusion amounts S of the upper horizontal frame 39a and the center horizontal frame 39b from the first vertical frame 35a and the second vertical frame 35b are approximately the same, and are, for example, approximately 100 mm to approximately 300 mm.

[0041] Furthermore, as shown in FIG. 8, the end frame members 40a and 40b of the upper horizontal frame 39a and the central horizontal frame 39b, respectively, are fixed with mounting members 48 using screws, rivets, etc. while in contact with the side surfaces 36f of the upper support members 36 of the first vertical frame 35a and the second vertical frame 35b facing inwardly into the work area.

[0042] The lower horizontal frame 39c is generally rod-shaped and extends linearly in the horizontal direction. The lower horizontal frame 39c is fixed so as to span between the first vertical frame 35a and the second vertical frame 35b, which are spaced apart from each other. The lower horizontal frame 39c has two frame members 42a, 42b and a stopper portion 43. The lower horizontal frame 39c is extendable and contractable in the horizontal direction.

[0043] The frame members 42a and 42b have, for example, a hollow, generally rectangular cross section. Here, the frame members 42a and 42b are made of the same material, which is more flexible than the top plate portion 110. Specifically, the frame members 42a and 42b are made of, for example, a synthetic resin. However, the frame members 42a and 42b may be made of different materials, and the frame member 42a may be made of a material that is more flexible than the frame member 42b, or the frame member 42b may be made of a material that is more flexible than the frame member 42a. The frame member 42a may have lower rigidity than the frame member 42b, or the frame member 42b may have lower rigidity than the frame member 42a. Specifically, the frame member 42a may be made of, for example, a synthetic resin or an aluminum alloy, and the frame member 42b may be made of, for example, an aluminum alloy or a synthetic resin. At least one of the frame members 42a and 42b may be formed by joining members made of different materials or the same material.

[0044] One end of the frame member 42a is fitted into the frame member 42b. The frame member 42b can slide laterally relative to the frame member 42b while being fitted into the frame member 42b. That is, the lower horizontal frame 39c can expand and contract laterally by changing the overlapping length of the frame members 42a and 42b. The lower horizontal frame 39c can expand and contract by the same amount as the upper horizontal frame 39a and the central horizontal frame 39b expand and contract from the first length (L1) to the second length (L2). The lower horizontal frame 39c has a stopper portion 43 that gradually stops the expansion and contraction when expanding and contracting laterally.

[0045] As shown in the enlarged cross-sectional view of FIG. 8, the stopper portion 43 is provided in the frame member 42a at a position where the frame members 42a and 42b overlap each other. The stopper portion 43 has a protruding member 44 and a biasing member 45. The protruding member 44 has a tapered or hemispherical tip and is biased by the biasing member 45 in a direction in which it always protrudes from a hole formed in the upper wall of the frame member 42a. The biasing member 45 is, for example, a coil spring, one end of which contacts the lower wall and the other end of which contacts the protruding member 44. The upper wall of the frame member 42b is formed with three holes 46a to 46c spaced apart in the longitudinal direction. When the lower horizontal frame 39c is expanded or contracted, if a hole formed in the upper wall of the frame member 42a communicates with any one of the holes 46a to 46a in the upper wall of the frame member 42b, the tip of the protruding member 44 protrudes from the connected hole. In this manner, when the tip of the protruding member 44 protrudes from any one of the holes 46a-46a, even if an operator tries to extend or retract the lower horizontal frame 39c in the horizontal direction, the extension or retraction can be stopped by the protruding member 44 interfering with the frame member 42b. When the extension or retraction of the lower horizontal frame 39c stops, the upper horizontal frame 39a and the central horizontal frame 39b cannot be extended or retracted either, and the extension or retraction of the entire horizontal frame portion 38 can be stopped.

[0046] On the other hand, when it is desired to extend or retract the horizontal frame portion 38 from a state in which the extension and retraction of the entire horizontal frame portion 38 is stopped, the worker presses the tip of the protruding member 44 protruding from any one of the holes 46a to 46c against the biasing member 45. When the protruding member 44 is pressed, the protruding member 44 enters the frame member 42a, and the protruding member 44 no longer interferes with the frame member 42b, allowing the horizontal frame portion 38 to extend or retract. The protruding member 44 can function as a release portion that releases the stop of the extension and retraction of the horizontal frame portion 38. In this way, the stopper portion 43 stops the extension / contraction of the horizontal frame portion 38, allowing the horizontal frame portion 38 to extend and contract in stages.

[0047] Here, when the protruding member 44 protrudes from the hole 46a, the horizontal length of the upper horizontal frame 39a and the central horizontal frame 39b is set to be a first length (L1). When the protruding member 44 protrudes from the hole 46c, the horizontal length of the upper horizontal frame 39a and the central horizontal frame 39b is set to be a second length (L2). When the protruding member 44 protrudes from the hole 46b, the horizontal length of the upper horizontal frame 39a and the central horizontal frame 39b is set to be a third length (L3).

[0048] 9(a) to 9(c) are diagrams for explaining the horizontal lengths of the upper horizontal frame 39a and the central horizontal frame 39b (the horizontal length of the horizontal frame portion 38). Figure 9(a) is a diagram showing the state in which the horizontal length of the horizontal frame portion 38 is a first length (L1), Figure 9(b) is a diagram showing the state in which the horizontal length of the horizontal frame portion 38 is a third length (L3), and Figure 9(c) is a diagram showing the state in which the horizontal length of the horizontal frame portion 38 is a second length (L2). Here, the relationship between the lengths is first length (L1)>third length (L3)>second length (L2). The third length is, for example, shorter than the length in the longitudinal direction of the top panel portion 110 and longer than the length in the lateral direction. The third length corresponds to the length in the lateral direction of the top panel portion 510, which has a size to be described later and is different from the top panel portion 110 of the above-mentioned workbench 100.

[0049] As shown in FIG. 8, the lower horizontal frame 39c is the lower support member 37 of the first vertical frame 35a and the second vertical frame 35b, and is fixed in contact with the opposing side surface 37f using the support member 50 and the L-shaped member 54 with screws, rivets, or the like.

[0050] The support member 50 supports the load of the entire handrail 31 when the handrail 31 is attached to the top plate portion 110 of the workbench 100. The support member 50 corresponds to an example of a mounting portion. The support member 50 is located at the lower part of the first vertical frame 35a and the second vertical frame 35b. The support member 50 is a plate-like member bent at a substantially right angle, and has a support portion 51 extending in a substantially horizontal direction and a standing portion 52 extending in a substantially vertical direction and contacting the lower support member 37 and the lower horizontal frame 39c. The support member 50 is made of, for example, an aluminum alloy or iron. When the handrail 31 is attached to the top plate portion 110 of the workbench 100, the support portion 51 supports the load of the entire handrail 31 by placing it on the surface of the top plate portion 110, and transmits the load of the handrail 31 to the top plate portion 110. In addition, the support portion 51 has two insertion holes 53a, 53b formed at a distance from each other for inserting the insertion pin 70. Here, the insertion holes 53a and 53b are long holes extending in the horizontal direction. The standing portion 52 is formed with a plurality of holes through which screws, rivets, etc. for connecting the lower support member 37 and the lower horizontal frame 39c are inserted.

[0051] The insertion hole 53a is a hole that communicates with the handrail hole 125 formed at the long end of the tabletop 110 when the handrail 31 with the horizontal frame portion 38 set to the first length (L1) is attached to the long end of the tabletop 110. On the other hand, the insertion hole 53b is a hole that communicates with the handrail hole 125 formed at the short end of the tabletop 110 when the handrail 32 with the horizontal frame portion 38 set to the second length (L2) is attached to the short end of the tabletop 110. In this way, by forming the insertion holes 53a and 53b for attaching the handrails 31 and 32 in the support portion 51 of the support member 50, the support member 50 can be used for both the handrails 31 and 32, and parts can be standardized.

[0052] The L-shaped member 54 is a plate having a substantially L-shape and is made of, for example, an aluminum alloy or iron. The L-shaped member 54 has a plurality of holes formed therein through which screws, rivets, or the like for connecting the lower support member 37 and the lower horizontal frame 39c are inserted. The lower horizontal frame 39c is fixed to the first vertical frame 35a and the second vertical frame 35b by the support member 50 and the L-shaped member 54.

[0053] When the handrail 31 is attached to the top plate portion 110 of the workbench 100, the abutment member 56 abuts against the top plate portion 110 from below. The abutment member 56 corresponds to an example of an attachment portion. The abutment member 56 is located at the lower end of the first vertical frame 35a and the second vertical frame 35b. The abutment member 56 has two fixing portions 57 fixed to the side of the lower end of the lower support member 37, an extension portion 58 extending from the fixing portion 57 in a substantially horizontal direction, and an abutment portion 59 located at the tip of the extension portion 58. The abutment member 56 is made of, for example, an aluminum alloy or iron. The two fixing portions 57 are fixed to the lower end of the first vertical frame 35a and the second vertical frame 35b by screws, rivets, etc. in a manner that sandwiches the lower support member 37 of the first vertical frame 35a and the second vertical frame 35b from both sides. The extension portion 58 extends horizontally from the fixing portion 57 and then extends obliquely upward so as to reach the inside of the top plate portion 110 without interfering with the end of the top plate portion 110 when the handrail 31 is attached to the top plate portion 110 of the workbench 100. The abutment portion 59 is located at the tip of the extension portion 58, and abuts against the top plate portion 110 from below within the top plate portion 110 when the handrail 31 is attached to the top plate portion 110 of the workbench 100.

[0054] The insertion pin 70 is a pin that is inserted into the insertion holes 53a, 53b of the support portion 51 of the support member 50. The insertion pin 70 is connected to the first vertical frame 35a and the second vertical frame 35b by, for example, a string-like member so as not to come off.

[0055] Next, a method for assembling the above-described workbench system 10 will be described. First, a worker assembles three row units 20a to 20c aligned along the front-rear direction as a reference. Specifically, the work tables 100a to 100c, 100d to 100f, and 100g to 100i are arranged with their respective longitudinal directions aligned along the front-rear direction at regular intervals in the front-rear direction (one direction).

[0056] Next, the worker bridges the bridge cart 200 between the top plate portions 110 of the work tables 100 that are separated in the front and rear. That is, the bridge carts 200a, 200c, 200e are bridged between the work tables 100a, 100d, 100g and the work tables 100b, 100e, 100h, and the bridge carts 200b, 200d, 200f are bridged between the work tables 100b, 100e, 100h and the work tables 100c, 100f, 100i. Specifically, the connecting pins 221 of the main body 210 of the bridge cart 200 are inserted into the connecting holes 118 of the workbench 100. Thus, the bridge cart 200 is connected to the workbench 100. At this time, a space is formed between the running part 230 of the bridge cart 200, i.e., the casters 231a to 231d, and the floor surface.

[0057] Next, the worker bridges the bridges 300 between the three row units 20a to 20c arranged at regular intervals in the left-right direction (the other direction). That is, the bridges 300 are bridged between the work tables 100a, 100b, 100c and the work tables 100d, 100e, 100f, and between the work tables 100d, 100e, 100f and the work tables 100g, 100h, 100i. The bridges 300 are also bridged between the bridge carts 200a, 200b and the bridge carts 200c, 200d, and between the bridge carts 200c, 200d and the bridge carts 200e, 200f. Specifically, the connecting pins 321 of the main body 310 of the bridge 300 are inserted into the connecting holes 118 of the work table 100 and the connecting holes 218 of the bridge cart 200. Thus, the bridge 300 is connected to the adjacent work tables 100 and bridge cart 200. By connecting the work platform 100, the bridge cart 200, and the bridge 300 in this way, a work plane is formed where workers can work at height. At this time, a space is formed between the bridge 300 and the floor surface. Here, since 15 bridges 300 are arranged in the front-to-rear direction, a long space is formed between the 15 bridges 300 and the floor surface along the front-to-rear direction, and this long space can be used as a space for storing temporary equipment and materials.

[0058] Next, the worker attaches the handrail section 30 to the outer periphery of the work plane. At this time, the worker prepares in advance the handrail 31 with the horizontal frame section 38 set to the first length (L1) and the handrail 32 with the horizontal frame section 38 set to the second length (L2). First, the handrail 31 with the horizontal frame portion 38 set to the first length (L1) is attached to the left ends of the work platform 100a, the bridge cart 200a, the work platform 100b, and the bridge cart 200b, and to the right ends of the work platform 100g, the bridge cart 200e, the work platform 100h, the bridge cart 200f, and the work platform 100i. Also, the handrail 31 with the horizontal frame portion 38 set to the first length (L1) is attached to the front end of the bridge 300 located in front of the work plane, and to the rear end of the bridge 300 located in the rear of the work plane. Next, the handrail 32 with the horizontal frame portion 38 set to the second length (L2) is attached to the rear ends of the work platforms 100a, 100d, 100g, the front ends of the work platforms 100c, 100f, 100i, and the left end of the work platform 100c.

[0059] Here, the attachment of the handrail portion 30 to the top plate portion 110 of the workbench 100 will be described with reference to Figs. Figure 10 is an oblique view showing a case in which a handrail 31 with a horizontal frame portion 38 of a first length (L1) is attached to the left end, which is the end of the long side of the workbench 100a, and a handrail 32 with a horizontal frame portion 38 of a second length (L2) is attached to the rear end, which is the end of the short side of the workbench 100a. Figure 11 is a cross-sectional view taken along line II in a substantially vertical direction and viewed from the direction of the arrow in Figure 10, with a handrail 31 having a horizontal frame portion 38 of a first length (L1) attached to the left end, which is the long side end of the workbench 100a.

[0060] To attach the handrail 31 with the horizontal frame portion 38 set to the first length (L1) to the tabletop portion 110, the worker brings the handrail 31 closer to the tabletop portion 110 while tilting the lower side of the handrail 31 closer to the tabletop portion 110. Next, the worker inserts and hooks the tip of the abutment member 56 into the rib 126 (see FIG. 11) formed on the lower part of the tabletop portion 110, and then rotates the handrail 31 so as to raise it up around the tip of the abutment member 56. The vertical frame portion 34 of the handrail 31 is in a substantially vertical direction, so that the support portion 51 of the support member 50 is placed on the surface of the tabletop portion 110. At this time, the insertion hole 53a of the support portion 51 communicates with the handrail hole 125. After that, the worker can attach the handrail 31 to the tabletop portion 110 by inserting the insertion pin 70 into the insertion hole 53a and the handrail hole 125. Furthermore, since the insertion hole 53a of the support part 51 is a long hole, even if the handrail 31 is slightly misaligned along the outer peripheral edge of the tabletop part 110, the insertion hole 53a of the support part 51 and the handrail hole 125 can be connected. Here, we have described the case where the handrail 31 with the horizontal frame portion 38 having a first length (L1) is attached to the top plate portion 110 of the workbench 100, but the same applies when the handrail 31 or the handrail 32 with the horizontal frame portion 38 having a second length (L2) is attached to the top plate portion 110 of the workbench 100, the main body portion 210 of the bridge cart 200, or the main body portion 310 of the bridge 300.

[0061] Next, the worker attaches the ladder section 60 to the outer periphery of the work surface. Specifically, the ladder section 60 is attached to the left end of the work platform 100c. The position where the ladder section 60 is attached can be changed as appropriate, and the attachment position of the handrail 32 with the horizontal frame section 38 set to the second length (L2) can be changed according to the attachment position of the ladder section 60.

[0062] In the work platform system 10 assembled in this manner, the handrail section 30 can surround the work plane, allowing the worker to work at height safely. According to this embodiment, the horizontal frame parts 38 of the handrails 31 and 32 are extendable in the longitudinal direction. Therefore, by extending and contracting the horizontal frame parts 38 in the longitudinal direction, even if the end of the top plate to be attached has a different length, the handrails can be used with the same configuration, and the number of types of handrails can be reduced. In addition, the horizontal frame parts 38 of the handrails 31 and 32 are extendable and contractable in stages in the longitudinal direction. Therefore, by extending and contracting in stages according to the length of the end of the top plate to be attached, the work of the worker to adjust the longitudinal length of the horizontal frame parts 38 can be reduced.

[0063] In addition, in the handrails 31 and 32 of this embodiment, both ends of the upper horizontal frame 39a and the central horizontal frame 39b are located outside the two first vertical frames 35a and the second vertical frames 35b when viewed from the work area. In other words, both ends of the upper horizontal frame 39a and the central horizontal frame 39b are not located between the two first vertical frames 35a and the second vertical frames 35b, but protrude beyond the first vertical frame 35a and the second vertical frame 35b in the horizontal direction. Therefore, the ends of the upper horizontal frame 39a and the central horizontal frame 39b can be brought close to the ends of the adjacent handrails 31 and 32, so that the gap between the adjacent handrails can be reduced.

[0064] With the handrail section 30 attached, the ends of the upper horizontal frames 39a and central horizontal frames 39b of adjacent handrails 31, 32 face each other at approximately the same height, reducing the gap between the ends, as shown by the two-dot chain line in Fig. 8. By reducing the gap in this way, parts of the worker's body are more likely to come into contact with the upper horizontal frames 39a and central horizontal frames 39b when the worker is working on the work plane. Furthermore, it is preferable that the handrails 31 and 32 are further configured such that, when viewed from the work area, both ends of the upper horizontal frame 39a and the central horizontal frame 39b are positioned outside the two first vertical frames 35a and second vertical frames 35b.

[0065] 11, the handrail 31 of this embodiment has the upper horizontal frame 39a and the central horizontal frame 39b positioned closer to the inside of the work area of ​​the workbench 100 than the two first vertical frames 35a and the second vertical frames 35b. Specifically, the first vertical frames 35a and the second vertical frames 35b do not substantially overlap with the top plate 110 in the vertical direction, but the upper horizontal frame 39a and the central horizontal frame 39b substantially overlap with the top plate 110 in the vertical direction. This makes it easier for a part of the worker's body to come into contact with the upper horizontal frame 39a or the central horizontal frame 39b, so that the worker can recognize the end of the work plane at an early stage when working near the edge of the work plane. On the other hand, the lower horizontal frame 39c is located closer to the outside of the working area of ​​the workbench 100 than the upper horizontal frame 39a and the central horizontal frame 39b. Specifically, as shown in Fig. 8, the lower horizontal frame 39c is located between the two first vertical frames 35a and the second vertical frames 35b. This prevents the surface of the top panel 110 of the workbench 100 from being covered by the lower horizontal frame 39c, and ensures a wide working plane for the top panel 110.

[0066] In addition, at least a portion of the first vertical frame 35a and the second vertical frame 35b, for example, more than half of the length, is made of a material that is easily bent. Therefore, when a worker comes into contact with the handrail 31 by leaning against it from the inside to the outside of the work area, the first vertical frame 35a and the second vertical frame 35b bend, causing the handrail 31 to tilt toward the outside of the work area. In other words, the handrail 31 tilts so that it is located more outside the work area as it approaches the upper side. In this way, by bending the first vertical frame 35a and the second vertical frame 35b to tilt the handrail 31, the force generated when the worker leans against it is absorbed by the first vertical frame 35a and the second vertical frame 35b. Therefore, the force generated when leaning can be prevented from being transmitted from the first vertical frame 35a, the second vertical frame 35b to the top plate portion 110 of the workbench 100, the main body portion 210 of the bridge cart 200, or the main body portion 310 of the bridge 300, thereby preventing the workbench 100, etc. from tipping over. Furthermore, since at least a portion of the upper horizontal frame 39a and the central horizontal frame 39b is made of a flexible material, the upper horizontal frame 39a and the central horizontal frame 39b can also absorb the force when the worker leans against them.

[0067] In addition, the first vertical frame 35a and the second vertical frame 35b have a lower rigidity of the upper support member 36 located on the upper side than the lower support member 37 located on the lower side. In other words, the first vertical frame 35a and the second vertical frame 35b have a higher rigidity of the lower support member 37 located on the lower side than the upper support member 36 located on the upper side. By increasing the rigidity of the lower side in this manner, it is possible to prevent the first vertical frame 35a and the second vertical frame 35b themselves from breaking when the first vertical frame 35a and the second vertical frame 35b bend. The rigidity or flexibility of the first vertical frame 35a and the second vertical frame 35b is not limited to being changed by the material, but may be changed by the shape.

[0068] In this embodiment, before the workbench system 10 is assembled, when the components of the workbench system 10 are stored in a warehouse or the like, the components can be stored with the components loaded on the bridge cart 200. It is preferable to load different types of components on each of the bridge carts 200a to 200f so that the components can be easily handled by workers. By storing the components of the workbench system 10 loaded on the bridge cart 200 in this manner, the bridge cart 200 functions as a transport cart, so that the components can be easily removed from the warehouse. In addition, when the storage location of the workbench system 10 is changed within the warehouse, the storage location can be easily changed.

[0069] Second Embodiment Next, a case where the handrail portion 30 described above is attached to a tabletop portion 510 of a different size will be described with reference to Fig. 12. Here, the handrail has the same configuration as in the first embodiment. Note that the same components as in the first embodiment are given the same reference numerals and the description will be omitted as appropriate.

[0070] Here, the work tables 100a to 100i in the first embodiment are changed to work tables 500a to 500i. Each of the nine work tables 500a to 500i has the same configuration. The top plate portion 510 of the workbench 500a is substantially rectangular in shape elongated in the front-rear direction in plan view. In this embodiment, the length of the top plate portion 510 in the front-rear direction (longitudinal direction) is, for example, approximately 2000 mm, and the length of the top plate portion 510 in the left-right direction (short direction) is, for example, approximately 1250 mm. The top plate portion 510 has a height of, for example, approximately 1500 mm to approximately 20000 mm from the floor surface. The bridge carts 200a to 200f of the first embodiment are changed to bridge carts 600a to 600f having a main body portion 610 whose size is substantially the same as that of the top plate portion 510. In addition, the number of bridges 300 connected at one end in the longitudinal direction of the top plate portions 510 and the bridge carts 600a to 600f of the workbenches 500a to 500i is increased from three to four in accordance with the size of the top plate portion 510 and the main body portion 610.

[0071] When a worker attaches the handrail section 30 to the outer peripheral edge of a work plane, he or she prepares in advance a handrail 33 whose horizontal frame section 38 has a third length (L3), a handrail 32 whose horizontal frame section 38 has a second length (L2), and a handrail 32 whose horizontal frame section 38 has a first length (L1). 12, the worker linearly attaches two handrails 32 with the horizontal frame portion 38 set to the second length (L2) to the left end, which is the end on the longer side, of the work platform 500a. Similarly, two handrails 32 are linearly attached to the left ends of the bridge cart 600a, work platform 500b, and bridge cart 600b, and to the right ends of the work platforms 500g, bridge cart 600e, work platform 500h, bridge cart 600f, and work platform 500i. The worker attaches the handrail 31, with the horizontal frame portion 38 set to the first length (L1), to the front end of the bridge 300 located on the front side of the work plane, the rear end of the bridge 300 located on the rear side of the work plane, and the left end of the work platform 500c. Finally, as shown in Fig. 12, the worker attaches the handrail 33, whose horizontal frame portion 38 has the third length (L3), to the rear end portion, which is the short end portion, of the work platform 500a. Similarly, the handrail 33, whose horizontal frame portion 38 has the third length (L3), is attached to the rear ends of the work platforms 500d and 500g and the front ends of the work platforms 500c, 500f, and 500i.

[0072] In the work platform system assembled in this manner, the handrail section 30 can surround the work plane, allowing the worker to work at height safely. According to this embodiment, the horizontal frame portion 38 can be extended or contracted to a corresponding third length when attached to the end of the tabletop portion 510, specifically the short end of the tabletop portion 510, which is a different size from the tabletop portion 110 of the first embodiment, thereby reducing the number of types of handrails.

[0073] Although the present invention has been described above with reference to the above-mentioned embodiment, the present invention is not limited to the above-mentioned embodiment, and modifications and the like are possible within the scope of the present invention. In the above-described embodiment, a case has been described in which the horizontal frame portions 38 of the handrails 31, 32 are capable of extending and retracting in stages in the horizontal direction, but this is not limited to this case and the horizontal frame portions 38 may be capable of extending and retracting continuously to any length. In the above embodiment, the upper horizontal frame 39a and the central horizontal frame 39b are configured to be extendable and contractable in the horizontal direction using two end frame members 40a, 40b and an intermediate frame member 41, respectively, but this is not limited to the above. For example, the upper horizontal frame 39a and the central horizontal frame 39b may be configured to be extendable and contractable in the horizontal direction using two frame members like the lower horizontal frame 39c, or may be configured to be extendable and contractable in the horizontal direction using four or more frame members. In the above embodiment, the lower horizontal frame 39c is configured to be expandable and contractable in the horizontal direction using two frame members 42a, 42b, but this is not limited to the above. For example, the lower horizontal frame 39c may be configured to be expandable and contractable in the horizontal direction using three frame members such as the upper horizontal frame 39a and the central horizontal frame 39b, or may be configured to be expandable and contractable in the horizontal direction using four or more frame members.

[0074] In the above-described embodiment, the stopper portion 43 is provided on the lower horizontal frame 39c, which is located at the lowest position, but this is not limited to this case and the stopper portion 43 may be provided on the upper horizontal frame 39a or the central horizontal frame 39b. In the above-described embodiment, a case has been described in which the protruding member 44 of the stopper portion 43 protrudes from a hole formed in the upper wall of the lower horizontal frame 39c, but this is not limited to this case and the protruding member 44 may be configured to protrude from a hole formed in either the lower wall, the outer wall or the inner wall.

[0075] In the above-described embodiment, the handrail 33 having the horizontal frame portion 38 of the third length (L3) is attached to the short end of the tabletop portion 510, but this is not limited to this case and the handrail may be attached to the long end of a tabletop portion of a different size than the tabletop portion 510. In the above-described embodiment, two handrails 32 with horizontal frame portions 38 of a second length (L2) are attached to the long side ends of the tabletop portion 510, but this is not limited to the above case, and they may be attached to the short side ends of a tabletop portion of a different size than the tabletop portion 510. In the above-described embodiment, two handrails 32 with horizontal frame portions 38 of a second length (L2) are attached to the long side ends of the tabletop portion 510. However, this is not limited to the above case, and two handrails from the handrails 31 to 33 may be selected and attached to the ends of a tabletop portion of a different size than the tabletop portion 510.

[0076] In the above embodiment, the horizontal frame portion 38 is expandable in three steps in the horizontal direction to the first length (L1), the second length (L2), and the third length (L3). However, the present invention is not limited to this case, and the horizontal frame portion 38 may be expandable in three steps in the horizontal direction to the fourth length (L4). The relationship between the lengths may be the fourth length (L4)>the first length (L1), the second length (L2)>the fourth length (L4), the first length (L1)>the fourth length (L4)>the third length (L3), or the third length (L3)>the fourth length (L4)>the second length (L2). In addition, when the fourth length (L4)>the first length (L1), the fourth length (L4) may be approximately twice the length (L2×2) of the second length (L2). In addition, the horizontal frame portion 38 may be expandable in two steps, five steps, six steps, or more.

[0077] In the above embodiment, the handrail 31 has two first vertical frames 35a and two second vertical frames 35b, but the present invention is not limited to this and may have three or more vertical frames. In this case, the upper horizontal frame 39a and the center horizontal frame 39b can be configured so that both ends are located outside the two outermost vertical frames among the three or more vertical frames.

[0078] Further, in the above-described embodiment, the handrail 31 has been described as having one central side horizontal frame 39b, but is not limited to this case, and may have two or more central side horizontal frames 39b. In the above embodiment, three or four bridges 300 are connected to one of the longitudinal ends of the work tables 100, 500 or the bridge carts 200, 600, but the present invention is not limited to this. For example, instead of the bridge 300, one bridge made up of three or four bridges 300 arranged side by side may be used.

[0079] In addition, the above-mentioned workbench system 10 has been described as forming a substantially rectangular work plane, but for example, if there is a pillar at the work site, interference with the pillar can be prevented by removing a part of the bridge 300 and inserting the pillar into the removed position. In addition, the bridge carts 200 and 600 described above are described as having the running portion 230, but this is not limited to this case, and the bridge carts may be simple bridges that do not have the running portion 230, or may be the work platforms 100 and 500. When the bridge carts 200 and 600 are used as the work platforms 100 and 500, the work platforms 100 and 500 are adjacent to each other.

[0080] In this embodiment, the handrail has a horizontal frame portion that is extendable and contractable in the longitudinal direction. However, this is not limited to this case and can be modified as appropriate depending on the issues, etc. [Explanation of symbols]

[0081] 10: Workbench system 30: Handrail section 34: Vertical frame section 35a: First vertical frame 35b: Second vertical frame 38: Horizontal frame section 39a: Upper horizontal frame 39b: Central horizontal frame 39c: Lower horizontal frame 43: Stopper section 100 (100a to 100i), 500 (500a to 500i): Workbench 110, 510: Top plate section

Claims

1. A handrail attached to an end of a top plate of a workbench, It has a horizontal frame part that is expandable in the longitudinal direction, The horizontal frame portion is a first cross frame having two end frame members and a middle frame member; A handrail comprising: a second horizontal frame that is extendable and retractable in a stepwise manner in the longitudinal direction.

2. 2. The handrail according to claim 1, wherein both ends of the intermediate frame member are fitted into the end frame members.

3. 3. The handrail according to claim 1 or 2, wherein the end frame members are more flexible than the intermediate frame members.

4. 3. The handrail according to claim 1 or 2, wherein the intermediate frame members are more flexible than the end frame members.

5. The second horizontal frame includes:

5. The handrail according to claim 1, further comprising a stopper portion that stops the extension and contraction in stages when the handrail is extended and contracted in the longitudinal direction.

6. The handrail according to claim 5, wherein the second horizontal frame is located lower than the first horizontal frame.

7. The stopper portion is The handrail according to claim 6, further comprising a release portion that releases the stoppage of the extension and contraction of the second horizontal frame.

8. A handrail attached to an end of a top plate portion of a workbench, It has a horizontal frame part that is expandable in the longitudinal direction, The horizontal frame portion is a first cross frame having two end frame members and a middle frame member; A first length corresponding to when the handrail is attached to the end portion on the long side of the tabletop portion; A handrail characterized in that the handrail can be extended and contracted in stages in the longitudinal direction so as to have a corresponding second length when attached to the short end portion of the tabletop.

9. The horizontal frame portion is The handrail according to claim 8, further characterized in that it is extendable and retractable in a stepwise manner in the longitudinal direction to a third length different from both the first length and the second length.

10. 10. The handrail of claim 9, wherein the third length is shorter than the first length and longer than the second length.

11. A vertical frame portion extends along a direction perpendicular to the longitudinal direction and supports the horizontal frame portion, The handrail according to any one of claims 1 to 10, wherein the vertical frame portion is flexible.

12. If the top plate portion is a first top plate portion, 11. A workbench system comprising the handrail according to claim 9 or 10, the first tabletop portion, and a second tabletop portion having a size different from that of the first tabletop portion, A workbench system characterized in that the third length is a length that corresponds to when the handrail is attached to the end of the second tabletop portion.

13. The workbench system according to claim 12, characterized in that the third length is a length that corresponds to when the handrail is attached to the short side end or the long side end of the second tabletop portion.

14. If the top plate portion is a first top plate portion, A workbench system comprising the handrail according to any one of claims 8 to 10, the first tabletop portion, and a second tabletop portion having a size different from that of the first tabletop portion, A workbench system characterized in that the second length is a length that corresponds to when the two handrails are attached to the end of the second tabletop portion when they are straightened along the longitudinal direction.

15. A workbench having a top plate portion; A workbench system comprising: a handrail attached to an end of the top plate portion, The handrail is: a first length corresponding to the end of the top plate portion on the long side when the top plate portion is attached to the long side; a horizontal frame portion that is extendable and contractable in a stepwise manner in a longitudinal direction so as to have a corresponding second length when attached to the short-side end portion of the top plate portion; The horizontal frame portion is A workbench system comprising: a first lateral frame having two end frame members and an intermediate frame member.

Images