Workbench

Abstract

To provide a workbench which has lifting legs and non-lifting legs, and is designed to ensure that operators use the lifting legs and avoids using the non-lifting legs.SOLUTION: In a workbench, a first leg body supporting a first end edge portion of a top plate is designated as a lifting leg (2A), and a second leg body supporting a second end edge portion is designated as a non-lifting leg (3A). A pair of first handhold bars (6a, 6b) and a pair of second handhold bars (7a, 7b) are erected respectively from near both ends of the first end edge portion and the second end edge portion. A passage prohibition bar (11) is provided to prevent operators from passing through an opening (10) formed between the pair of second handhold bars (7a, 7b). The passage prohibition bar (11) is configured to freely change its posture between a usage posture (P3) where it crosses the opening (10) and a storage posture (P1) where it is aligned along the handhold bar.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] To provide a workbench provided with lifting legs and non-lifting legs for supporting a top plate, and particularly to a workbench that allows a worker to use the lifting legs but not the non-lifting legs when ascending or descending to the top plate. [Background technology]

[0002] BACKGROUND ART Conventionally, work platforms such as those shown in FIGS. 1 and 2 are well known and are used for performing work at height.

[0003] As shown in Figure 1, the work platform comprises a top plate 1, a first leg body 2, and a second leg body 3. The top plate 1 has a first girder edge 4a and a second girder edge 4b ​​in the longitudinal direction and a first end edge 5a and a second end edge 5b in the lateral direction, and is configured so that the first end edge 5a is supported by the first leg body 2, and the second leg body 3 supports the second end edge 5b. When working at height, the work platform is used with the legs 2, 3 in an extended position facing downward and in contact with the floor, and when not in use, the work platform is stored in a folded position under the top plate 1, making it easy to transport and store.

[0004] In the illustrated workbench, the first leg 2 has step bars 2a arranged in a vertical direction, which form lifting legs 2A for allowing the worker to climb up and down onto the top board 1.

[0005] In contrast, the second leg 3 constitutes a non-climbing leg 3A on which workers are prohibited from climbing up and down. For example, in the case of a workbench for wall-side work, which allows work by bringing the second end edge 5b of the top panel 1 close to the wall, the second leg 3 is configured to rise at an angle close to a right angle from the floor. Therefore, even when not performing wall-side work, it is dangerous to use the second leg 3 for climbing up and down, so it is preferable to make it a non-climbing leg 3A. For this reason, as shown in the figure, the second leg 3 is not provided with a tread, but rather is provided with a sign 3a bearing a warning that climbing up and down is prohibited.

[0006] Incidentally, in the work space above the tabletop 1, a pair of first handhold rods 6a, 6b are erected upward from near both ends of the first end edge 5a, and a pair of second handhold rods 7a, 7b are erected upward from near both ends of the second end edge 5b.

[0007] The first handhold rods 6a, 6b provide handholds that can be grasped with the fingers when a worker climbs up the lifting legs 2A (first leg body 2) to get on to the tabletop 1, and are pivotally attached to the upper ends of the pair of pedestals 2b, 2b of the first leg body 2. Therefore, a worker who has climbed up the lifting legs 2A gets on to the tabletop 1 through an opening formed between the first handhold rods 6a, 6b. The first handhold rods 6a, 6b can be flipped over from the upright position shown in the figure as indicated by the arrows to be placed on top of the pedestal 2b, and when the work platform is not in use, they are folded down under the tabletop 1 together with the first leg body 2.

[0008] In contrast, the second handhold rods 7a, 7b do not provide handholds for the worker to grasp with their fingers, but are provided for the safety of the worker working on the tabletop 1, and are pivotally attached to the upper ends of the pair of pedestals 3b, 3b of the second leg body 3. The second handhold rods 7a, 7b can be placed on top of the pedestal 3b by flipping them over as shown by the arrow from the upright position shown in the figure, and when the workbench is not in use, they are folded down under the tabletop 1 together with the second leg body 3.

[0009] Furthermore, a first girder side safety bar 8a and a second girder side safety bar 8b, and a first end side safety bar 9a and a second end side safety bar 9b are provided at the upper ends of the first handhold rods 6a, 6b and the second handhold rods 7a, 7b.

[0010] The first girder-side safety bar 8a connects the upper ends of the first handhold rod 6a and the second handhold rod 7a located at both ends of the first girder edge 4a. The second girder-side safety bar 8b connects the upper ends of the first handhold rod 6b and the second handhold rod 7b located at both ends of the second girder edge 4b. The first end-side safety bar 9a connects the upper ends of the pair of first handhold rods 6a, 6b located at both ends of the first end edge 5a, and the second end-side safety bar 9b connects the pair of second handhold rods 7a, 7b located at both ends of the second end edge 5b.

[0011] As a result, the work space above the tabletop 1 is surrounded by the first girder-side safety bar 8a, the second girder-side safety bar 8b, and the first gable-side safety bar 9a, and the second gable-side safety bar 9b. Therefore, if a worker comes into contact with any of the safety bars while working on the tabletop 1, the worker will sense that there is a risk of stepping off the tabletop 1, thereby ensuring safety. Note that these safety bars are foldable as described below, and when the worker begins work, they are unfolded from the folded state and installed between the respective handrail bars.

[0012] As shown in Figure 1, the first girder-side safety bar 8a and the second girder-side safety bar 8b are each formed from telescopic, nested pipe material. The base end of the first girder-side safety bar 8a is pivotally connected to the upper end of the first handhold 6a, and the tip of the extended pipe is releasably engaged and fixed to the second handhold rod 6b. The base end of the second girder-side safety bar 8b is pivotally connected to the upper end of the second handhold rod 7b, and the tip of the extended pipe is releasably engaged and fixed to the first handhold rod 6b.

[0013] Each handrail is formed from a pipe material with a rectangular cross section, and its peripheral surface forms an inner surface f1 where the first handrail 6a, 6b and the second handrail 7a, 7b face each other, and an outer surface f2 where the opposite surface faces each other.

[0014] When the work platform is not in use, the first girder side safety bar 8a is stored in a contracted and folded state along the inner surface f1 of the handrail 6a located at the first end edge 5a of the pair of handrails. Also, the second girder side safety bar 8b is stored in a contracted and folded state along the inner surface of the handrail 7b located at the second end edge 5b of the pair of handrails. The girder side safety bars 8a, 8b stored in this manner can be stored under the top plate 1 by flipping the handrails 6a, 7b over.

[0015] In contrast, the first end side safety bar 9a is pivotally connected to the upper end of one of the first handhold rods 6a, 6b located at the first end edge 5a (the handhold rod not pivotally connected to the first girder side safety bar 8a), 6b, and its tip is detachably engaged and fixed to the other handhold rod 6a. Also, the second end side safety bar 9b is pivotally connected to the upper end of one of the second handhold rods 7a, 7b located at the second end edge 5b (the handhold rod not pivotally connected to the second girder side safety bar 8b), 7b, 7a, and its tip is detachably engaged and fixed to the other handhold rod 6a.

[0016] When the workbench is not in use, the first end-side safety bar 9a is rotated downward and stored along the inner surface f1 of the pivotally connected first handrail rod 6b, as shown by the solid line in Figure 1. Similarly, the second end-side safety bar 9b is rotated downward and stored along the inner surface f1 of the pivotally connected second handrail rod 7a, as shown by the solid line in Figure 1. The end-side safety bars 9a, 9b stored in this manner can be stored under the top board 1 by inverting the handrail rods 6b, 6a. [Prior art documents] [Patent documents]

[0017] [Patent Document 1] Patent No. 5412456 [Patent Document 2] Patent No. 5443441 [Patent Document 2] Patent No. 7324105 Summary of the Invention [Problem to be solved by the invention]

[0018] As shown in Figure 2(A), with the work platform configured as described above, prior to working at height, the worker erects the first handhold rods 6a, 6b and the second handhold rods 7a, 7b at the four corners of the top plate 1, and then hangs the first girder side safety bar 8a and the second girder side safety bar 8b and the first gable side safety bar 9a and the second gable side safety bar 9b between these handhold rods on the top plate 1, thereby enclosing the work space and performing work.This allows the worker to sense the boundaries around the work space, thereby preventing falls during work and ensuring safety.

[0019] However, as shown in Figure 2(B), even on a work platform where the second leg 3 is a non-climbing leg 3A and workers are prohibited from ascending or descending, an opening 10 is formed above the second end edge 5b between the second handhold rods 7a, 7b. In this case, even when the second handhold rods 7a, 7b are connected by the second end side safety bar 9b, the opening 10 formed below the second end side safety bar 9b is made large enough that a worker can pass through by squeezing through it.

[0020] For this reason, according to information obtained by the inventor, even when a notice prohibiting climbing up and down is posted on the sign 3a, there have been reported cases in which, for various reasons, workers have passed through the opening 10 and placed their feet on the second leg 3 to climb up and down between the top plate 1 and the floor.

[0021] However, since the second leg 3 is designed as a non-lifting leg 3A, it is dangerous for a worker to use it for lifting and lowering, and there is also the possibility that it may be easily damaged if a worker steps on it, so there is a need to solve this problem.

[0022] The present invention provides a workbench that solves this problem. [Means for solving the problem]

[0023] Therefore, the present invention provides a work platform comprising a top plate having first and second girder edges in the longitudinal direction and first and second end edges in the lateral direction, first and second leg bodies supporting the first and second end edges, respectively, and a pair of first and second handrails erected upward from near both ends of the first and second end edges, the first leg bodies forming lifting legs for allowing a worker to climb up and down to the top plate, and the second leg bodies forming non-lifting legs that prohibit the worker from climbing up and down, and a no-pass bar provided in an opening formed above the second end edges and between the pair of second handrails to prevent the worker from passing through the opening, the no-pass bar being attached to one of the pair of second handrails and configured to be freely changeable between a usage position in which it crosses the opening and a storage position in which it is aligned along the handrail bar.

[0024] In a preferred embodiment, a first girder side safety bar is provided which connects the upper ends of a pair of handrails located near both ends of the first girder edge, and a second girder side safety bar which connects the upper ends of a pair of handrails located near both ends of the second girder edge, the peripheral surfaces of the first and second handrails being such that the opposing surfaces form the inner side and the opposite surfaces form the outer side, the first and second girder side safety bars are configured to be stored along the inner side of a specific handrail bar when folded, and the no-pass bar is configured to be stored along the outer side of one of the pair of second handrails when in the stored position.

[0025] According to the first embodiment of the present invention, one of the pair of second handhold rods is a support-side handhold rod and the other is a receiving-side handhold rod, and a pivot is protruding from the longitudinal midsection of the support-side handhold rod, and the no-pass bar is configured so that, when it is in the usage position, its tail end is located in the vertical midsection of the support-side handhold rod and its tip end overlaps the receiving-side handhold rod, and guide means is provided extending from the vicinity of the tail end toward the tip end, and the guide means is held by being rotatably and slidably supported on the pivot, so that by sliding via the guide means, the longitudinal midsection of the no-pass bar crosses the support-side handhold rod, which constitutes an intermediate position of the no-pass bar, and from this intermediate position, the guide means slides to move the tip end over the receiving-side handhold rod to attain the usage position, and from the intermediate position, the no-pass bar rotates around the pivot to overlap along the support-side handhold rod, thereby attaining the stored position.

[0026] According to a second embodiment of the present invention, one of the pair of second handhold rods is a support-side handhold rod and the other is a receiving-side handhold rod, and guide means extending longitudinally is provided on the support-side handhold rod, and the no-pass bar is configured so that, when it is in the use position, its tail end is located in the vertical middle of the support-side handhold rod and its tip end overlaps the receiving-side handhold rod, and a pivot is provided near the tail end and is held by being rotatably and slidably supported on the guide means, and the no-pass bar, which is in a position crossing the opening by sliding via the guide means, is moved in the vertical direction of the opening by the guide means to form an intermediate position of the no-pass bar, and the no-pass bar is moved from the intermediate position to the vertical center of the opening via the sliding of the guide means so that its tip end overlaps the receiving-side handhold rod to achieve the use position, and the no-pass bar is rotated from the intermediate position around the pivot to overlap along the support-side handhold rod to achieve the stored position.

[0027] In both the first and second embodiments, the tip of the no-pass bar is preferably provided with a locking device that has a locking piece biased in the locking direction by a spring and an operating piece that moves the locking piece in the unlocking direction, and the receiving handrail is provided with an in-use locking device that receives the tip of the no-pass bar in the in-use position and locks the locking piece of the locking device to secure the no-pass bar, and the supporting handrail is provided with a stored locking device that receives the tip of the no-pass bar in the stored position and locks the locking piece of the locking device to secure the no-pass bar. [Effects of the Invention]

[0028] The present invention relates to a workbench in which the second legs 3 are non-lifting legs 3A to prohibit workers from ascending or descending, and is provided with a pass-prohibition bar 11 that prevents workers from passing through an opening 10 formed between the second handhold bars 7a, 7b above the second end edge 5b. This prevents the worker from passing through the opening 10, and as a result, the worker cannot ascend or descend between the top board 1 and the floor via the non-lifting legs 3A, preventing bodily injury to the worker and preventing damage to the non-lifting legs 3A.

[0029] The no-pass bar 11 is provided on the support-side handrail 12, which is formed by one of the pair of second handrails 7a, 7b, and can be freely changed between a use position P3 in which it crosses the opening 10 and a storage position P1 in which it is aligned with the handrail 12. Therefore, when the workbench is not in use, it is integrated with the handrail 12 by being in the storage position P1, and can be folded up by following the inversion of the handrail 12. [Brief explanation of the drawings]

[0030] [Figure 1] FIG. 1 is a perspective view showing a workbench according to a conventional technique. [Figure 2]1A is a perspective view of a conventional workbench showing a worker working thereon, and FIG. 1B is a perspective view showing that the worker can pass through an opening. [Figure 3] 1A and 1B are perspective views of the workbench according to the first embodiment of the present invention, taken from the side of the lifting legs, with FIG. 1A being a perspective view of the no-pass bar in the use position, and FIG. 1B being a perspective view of the no-pass bar in the storage position. [Figure 4] 1A and 1B are perspective views of the workbench according to the first embodiment of the present invention, taken from the side of the non-lifting legs, with FIG. 1A being a perspective view of the no-pass bar in the use position, and FIG. 1B being a perspective view of the no-pass bar in the storage position. [Figure 5] 1A and 1B show a prohibition bar according to a first embodiment, in which FIG. 1A is a perspective view showing the outer surface, and FIG. 1B is a perspective view showing the inner surface. [Figure 6] FIG. 2 is a perspective view showing a stored position of the pass-prohibition bar in the first embodiment. [Figure 7] FIG. 10 is a perspective view showing the initial movement of the pass prohibition bar of the first embodiment when the bar is changed from the stored position to the use position. [Figure 8] FIG. 2 is a perspective view showing an intermediate position of the pass-prohibition bar of the first embodiment. [Figure 9] FIG. 2 is a perspective view showing a usage posture of the pass prohibition bar of the first embodiment. [Figure 10] FIG. 10 is a perspective view showing a retracted position of a pass-prohibition bar of a workbench according to a second embodiment of the present invention. [Figure 11] FIG. 10 is a perspective view showing an intermediate position of the pass-prohibition bar of the second embodiment. [Figure 12] FIG. 10 is a perspective view showing a usage posture of the pass prohibition bar of the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0031] A preferred embodiment of the present invention will be described in detail below with reference to Figures 3 to 12. The workbench of the embodiment of the present invention is a workbench that is common to the prior art shown in Figures 1 and 2, except for the configuration related to the no-pass bar, which will be described later. Therefore, the common components are denoted by the same reference numerals as those described above, and by referencing the above description, duplicated explanations will be omitted.

[0032] (First embodiment) Figures 3 to 9 show a first embodiment of the present invention, in which the workbench is provided with a no-pass bar 11 that prevents a worker from passing through an opening 10 formed between a pair of second handhold bars 7a, 7b above the second end edge 5b.

[0033] In this case, one of the pair of second clue rods 7a, 7b constitutes the support-side clue rod 12, and the other constitutes the receiving-side clue rod 13, and the no-pass bar 11 is attached to the support-side clue rod 12. The no-pass bar 11 is configured to be freely changeable between a stored position P1 in which it is stacked along the outer surface f2 of the support-side clue rod 12, an intermediate position P2 in which the longitudinal middle portion of the no-pass bar 11 crosses the support-side clue rod 12, and a use position P3 in which the tail end 11a is supported by the support-side clue rod 12 and crosses the opening 10, and the tip end 11b is stacked on the receiving-side clue rod 13.

[0034] In the illustrated example, the support side handrail 12 is formed by the handrail 7a (the handrail 7a that stores the second end side safety bar 9b on the inner surface f1) of the pair of second handrails 7a, 7b facing the first girder edge 4a, but the support side handrail 12 may also be formed by the opposite handrail 7b, and a no-pass bar 11 may be provided on this handrail 7b.

[0035] In the first embodiment, as shown in Figure 5(B), the support-side handhold bar 12 has a pivot 14 located in the middle of its length and protruding from the outer surface f2. In this case, it is preferable that the pivot 14 be located at a height that divides the height of the handhold bar 12 into approximately two halves.

[0036] In the illustrated example, the pivot 14 is formed by passing a bolt 15 through the handrail 12 from the outer surface f2 to the inner surface f1 and fixing it with a nut 16, but it is not limited to this and in short, it is sufficient if it constitutes an axis that supports the no-passage bar 11.

[0037] In contrast, the no-pass bar 11 is formed from a pipe material with a rectangular cross section, and the surface that overlaps the handrail 12 forms the inner surface F1, and the opposite surface forms the outer surface F2, and a guide means 17 is provided on the inner surface F1.

[0038] The guide means 17 extends from the vicinity of the tail end 11a of the no-passage bar 11 toward the tip end 11b, and is configured to be supported by the pivot 14 so as to be rotatable and slidable.

[0039] In the illustrated example, the guide means 17 is configured by a slot 18 formed in the inner surface F1 of the no-pass bar 11, through which the neck of the bolt 15 that constitutes the pivot 14 is slidably inserted and whose head is held inside the no-pass bar 11. However, the guide means 17 is not limited to the configuration shown in the figure, and may be formed by a rail with a bottomed groove or the like, or in short, anything that can be held so as to be rotatably and slidably supported on the pivot 14 and not to fall off.

[0040] 6 to 9, when the no-pass bar 11 is in a storage position P1 overlapping alongside the supporting handrail 12, the handrail 12 is provided with a storage locking device 19 that receives and locks the tip 11b of the no-pass bar 11. When the no-pass bar 11 is in a usage position P3 with the tail end 11a supported by the supporting handrail 12 and the tip 11b overlapping the receiving handrail 13, the receiving handrail 13 is provided with a usage locking device 20 that receives and locks the tip 11b of the no-pass bar 11.

[0041] In response to this, a locking device 21 as shown in Figure 5 is provided at the tip 11b of the no-pass bar 11, and the locking device 21 has a locking piece 23 biased in the locking direction by a spring 22, and an operating piece 24 that moves the locking piece 23 in the unlocking direction against the spring 22.

[0042] In the illustrated embodiment, the spring 22 is made up of a leaf spring having a pair of branches 22a, 22a bent in an approximately U-shape, a locking piece 23 is formed by a pin protruding outward from the tip of the branch 22a, and an operating piece 24 is formed by an outward pin arranged next to the locking piece 23, and the spring 22 is installed inside the tip 11b of the no-pass bar 11, and the locking piece 23 and operating piece 24 protrude from both side surfaces of the no-pass bar 11 through holes.

[0043] As a result, when the bar is set to the storage position P1, the tip of the no-pass bar 11 is received by the storage locking device 19 while the locking piece 23 is retracted into the hole against the force of the spring 22. After being received, the locking piece 23 is protruded by the spring 22, thereby being locked and fixed. At this time, the storage locking device 19 is provided with a locking hole 19a that locks the locking piece 23. From this state, if the operator presses the operating piece 24 against the force of the spring 22 with the operator's finger or the like, the locking piece 23 will disengage from the locking hole 19a, and the locking will be released.

[0044] Similarly, when in use position P3, the tip of prohibition bar 11 is received by in-use locking device 20 while locking piece 23 is retracted into the hole against the force of spring 22, and after being received, locking piece 23 is protruded by spring 22, thereby being locked and fixed. At this time, in-use locking device 20 is provided with locking hole 20a that locks said locking piece 23. As described above, when operating piece 24 is pushed in against spring 22, locking piece 23 is released from locking hole 19a, and the locking is released.

[0045] As shown in FIG. 5, the no-pass bar 11 is preferably provided with warning signs 25 to alert workers, and the warning signs 25 are preferably provided on the inner surface F1, outer surface F2 and both side surfaces of the no-pass bar 11.

[0046] (action) 6 shows the no-pass bar 11 in the storage position P1. The no-pass bar 11 is stacked along the support handrail 13, and the middle part in the longitudinal direction is supported and held by the pivot 14, with the tip 11b locked and fixed to the storage locking device 19 via the locking device 21.

[0047] From this state, when the locking device 21 is released, the guide means 17 slides relative to the pivot 14, allowing the no-pass bar 11 to move longitudinally, as shown in Figure 7, thereby allowing the tip 11b to be released from the storage locking device 19.

[0048] Therefore, as shown in Figure 8, by rotating the no-pass bar 11 around the pivot 14, it is placed in an intermediate position P2 in which the middle part of the longitudinal direction crosses the supporting handrail 12, and the tip 11b can be directed toward the locking device 20 when in use.

[0049] Therefore, when the no-pass bar 11 is moved from the intermediate position P2 toward the receiving handrail 13 by sliding the guide means 17 relative to the pivot 14, the tip end 11b is locked and fixed to the in-use locking device 20 via the locking device 21, as shown in Figure 9, and the bar is placed in the use position P3.

[0050] The no-pass bar 11 in use position P3 crosses the opening 10 and prevents the worker from passing through the opening 10. As described above, by providing the pivot 14 at a height position that divides the height of the handrail 12 in half, the no-pass bar 11 crosses almost the center of the opening 10 and divides the opening 10 into almost two equal parts, top and bottom, making it extremely difficult for the worker to pass through.

[0051] When returning the pass-prohibition bar 11 from the use position P3 to the storage position P1, the above-described steps can be performed in reverse.

[0052] As described above, the first embodiment is characterized in that the pivot 14 is provided on the support side handrail 12 and the guide means 17 is provided on the no-pass bar 11, thereby making it possible for the no-pass bar 11 to assume an intermediate position P2 in which the longitudinal middle portion thereof crosses the support side handrail 12.

[0053] Due to this feature, the no-pass bar 11 can be placed in the use position P3 from the intermediate position P2 by sliding the guide means 17 so that the tip end 11b of the no-pass bar 11 overlaps the receiving handrail 13. Conversely, the no-pass bar 11 can be placed in the storage position P1 from the intermediate position P2 by rotating the no-pass bar 11 around the pivot 14 so that it overlaps the supporting handrail 12.

[0054] (Second embodiment) Figures 10 to 12 show a second embodiment of the present invention, in which the workbench is provided with a no-pass bar 11 that prevents a worker from passing through an opening 10 formed between a pair of second handhold bars 7a, 7b above the second end edge 5b.

[0055] One of the pair of second clue rods 7a, 7b constitutes the supporting clue rod 12 and the other constitutes the receiving clue rod 13, and the no-passing bar 11 is provided on the supporting clue rod 12.

[0056] As in the first embodiment, the no-pass bar 11 is configured to be freely changeable between a storage position P1 in which it is stacked along the outer surface f2 of the support side handrail 12, and a usage position P3 in which it crosses the vertical center of the opening 10 with its tail end 11a supported by the support side handrail 12.

[0057] However, unlike the first embodiment, the no-pass bar 11 is configured so that its tail end 11a is supported by the support-side handrail 12 and its tip end 11b is placed over the receiving-side handrail 13, and is moved in the vertical direction of the opening 10, with the moved position being the intermediate position P2.

[0058] In the second embodiment, the pivot 14M is provided on the inner surface F1 of the tail end 11a of the no-passing bar 11. For example, the pivot 14M can be configured by providing a bolt or the like in a protruding manner.

[0059] In contrast, guide means 17M is located on the outer surface f2 of the support-side grab bar 12 and extends in the longitudinal direction. In this case, guide means 17M extends from near the upper or lower end of the support-side grab bar 12 to approximately the center in the longitudinal direction. As in the illustrated embodiment, it is preferable to extend guide means 17M downward from near the upper end of the grab bar 12 to approximately the center in the longitudinal direction, thereby forming support portion 17a at the lower end of guide means 17M.

[0060] The guide means 17M is composed of a slot 18 formed on the outer surface f2 of the support-side handrail 12, through which the pivot 14M is inserted so as to be rotatable and slidable, and which holds the pivot 14M so as not to fall out. Note that the guide means 17M may be formed by a rail or the like instead of a slot.

[0061] 10 to 12, when the no-pass bar 11 is in a storage position P1 overlapped along the supporting handrail 12, the handrail 12 is provided with a storage locking device 19M that receives and locks the tip 11b of the no-pass bar 11. When the no-pass bar 11 is in a usage position P3 with the tail end 11a supported by the supporting handrail 12 and the tip 11b overlapping the receiving handrail 13, the receiving handrail 13 is provided with a usage locking device 20M that receives and locks the tip 11b of the no-pass bar 11.

[0062] Although not shown, it is preferable to provide a locking device similar to the locking device 21 described in relation to the first embodiment at the tip 11b of the no-pass bar 11. When the tip 11b of the no-pass bar 11 and the storage locking device 19M and use locking device 20M that receive it are configured as shown, the locking pieces of the locking device can be configured to protrude from the outer surface F2 of the tip 11b, and locking holes that lock and fix the locking pieces can be provided in the storage locking device 19M and use locking device 20M.

[0063] (action) Figure 10 shows the no-pass bar 11 in the stored position P1. The no-pass bar 11 is slid along the pivot 14M to the vicinity of the upper end of the guide means 17M, so that the tail end 11a faces upward and is stacked along the support-side handrail 13. At this time, the tip end 11b is locked and fixed by the locking device 1M9 for storage.

[0064] From this state, when the locking device on the tip 11b is released, the no-pass bar 11 rotates around the pivot 14M as shown in Figure 11, and the tip 11b is placed over the receiving handrail 13, thereby taking the intermediate position P2.

[0065] Therefore, the no-pass bar 11 in the intermediate position P2 can be moved downward by sliding the pivot 14M along the guide means 17M, and can be moved to a position where it is in the use position P3, crossing the vertical center of the opening 10, as shown in Figure 12.

[0066] When the no-pass bar 11 is in the use position P3, its tail end 11a is supported by the support portion 17a of the guide means 17 via the pivot 14M, and its tip end 11b is received and locked by the use locking device 20M, so that it maintains a substantially horizontal position. Note that, as mentioned above, if a locking device is provided on the tip end 11b, it can be locked and fixed to the use locking device 20M.

[0067] In the use position P3, the no-pass bar 11 crosses the opening 10 and prevents the worker from passing through the opening 10. As shown in the figure, it is preferable that the no-pass bar 11 is configured to divide the opening 10 into approximately two equal parts, upper and lower, in the center, making it extremely difficult for the worker's body to pass through.

[0068] When returning the pass-prohibition bar 11 from the use position P3 to the storage position P1, the above-described steps can be performed in reverse.

[0069] As described above, the second embodiment is characterized in that the pivot 14 is provided at the tail end 11a of the no-pass bar 11 and the guide means 17M is provided at the support side handrail 12, thereby making it possible to move the no-pass bar 11, which is in a position crossing the opening 10, in the vertical direction of the opening 10 along the guide means 17M to an intermediate position P2.

[0070] Due to this feature, the use position P3 can be achieved by moving the no-pass bar from the intermediate position P2 to the vertical center of the opening 10 via the sliding of the guide means 17M and overlapping the tip 11a with the receiving handrail 13. Conversely, the storage position P1 can be achieved by rotating the no-pass bar 11 from the intermediate position P2 around the pivot 14M to overlap it along the supporting handrail 12. [Explanation of symbols]

[0071] 1 baking sheet 2 First leg 2A Lifting legs 2a stepping stone 2b Pillar base 3 Second leg body 3A Non-elevating legs 3a Display board 3b Pillar base 4a 1st girder edge 4b 2nd digit edge 5a 1st gable edge 5b 2nd gable edge 6a, 6b First clue stick 7a, 7b Second handhold f1 inner surface f2 outer surface 8a First girder side safety bar 8b Second girder side safety bar 9a First wife side safety bar 9b Second wife's safety bar 10 Opening 11 No Passing Bar 11a Tail end 11b Tip F1 inner surface F2 outer surface P1 Storage position P2 intermediate posture P3 Usage posture 12 Support side handrail 13 Receiving handhold 14, 14M Axis 15 volts 16 Nut 17, 17M Guide means 17a Support part 18 slots 19, 19M Storage locking device 19a Locking hole Locking device when using 20, 20M 20a Locking hole 21 Locking device 22 Spring 22a Branch 23 Locking piece 24 Operation piece 25 Warning display

Claims

1. The table comprises a top plate (1) having first and second girder edges in the longitudinal direction and first and second girder edges in the lateral direction, a first leg body (2) and a second leg body (3) supporting the first and second girder edges, respectively, and a pair of first handhold rods (6a, 6b) and a pair of second handhold rods (7a, 7b) standing upward from the vicinity of both ends of the first and second girder edges, In a workbench, the first legs (2) constitute lifting legs (2A) for an operator to ascend and descend to the top board (1), and the second legs (3) constitute non-lifting legs (3A) that prohibit the operator from ascending and descending, an opening (10) formed above the second end edge between the pair of second handhold bars (7a, 7b) is provided with a pass-prohibition bar (11) for preventing a worker from passing through the opening; The workbench is characterized in that the no-pass bar (11) is provided on one of the pair of second handrails (7a, 7b) and is configured so that its position can be freely changed between a usage position (P3) in which it crosses the opening (10) and a storage position (P1) in which it is aligned with the handrail.

2. A first girder side safety bar (8a) is provided to interconnect the upper ends of a pair of handrails (6a, 7a) located near both ends of the first girder edge, and a second girder side safety bar (8b) is provided to interconnect the upper ends of a pair of handrails (6b, 7b) located near both ends of the second girder edge, The peripheral surfaces of the first handhold rods (6a, 6b) and the second handhold rods (7a, 7b) form an inner surface (f1) with their opposing surfaces and an outer surface (f2) with their opposite surfaces; The first girder side safety bar (8a) and the second girder side safety bar (8b) are configured to be stored along the inner surface (f1) of a predetermined handrail by folding, 2. The workbench according to claim 1, wherein the no-pass bar (11) is configured to be stored along the outer surface (F2) of one of the pair of second handhold bars (7a, 7b) when in the stored position (P1).

3. One of the pair of second handhold rods (7a, 7b) is a support handhold rod (12) and the other is a receiving handhold rod (13), and a pivot (14) is protruding from the longitudinal middle of the support handhold rod (12), The no-passing bar (11) is configured such that, when in the use position (P3), its tail end (11a) is positioned in the vertical middle of the support-side handrail (12) and its tip end (11b) is overlapped with the receiving-side handrail (13), and is provided with guide means (17) extending from the vicinity of the tail end toward the tip end, and is held by supporting the guide means (17) rotatably and slidably on the pivot (14). By sliding through the guide means (17), the state in which the intermediate portion of the longitudinal direction of the no-passing bar (11) crosses the handrail (12) on the support side is set as the intermediate position (P2) of the no-passing bar (11), The intermediate position (P2) is changed to the use position (P3) by sliding the guide means (17) so that the tip end (11b) overlaps the receiving handhold bar (13), 3. A workbench as claimed in claim 1 or 2, characterized in that it is configured to be set to the storage position (P1) by rotating the no-passing bar (11) around the pivot (14) from the intermediate position (P2) and stacking it along the support side handrail (12).

4. A locking device (21) is provided at the tip (11b) of the pass-prohibiting bar (11), the locking device (21) including a locking piece (23) biased in a locking direction by a spring (22) and an operating piece (24) for moving the locking piece (23) in a locking release direction, The receiving handrail (13) is provided with an in-use locking device (20) that receives the tip (11b) of the no-pass bar (11) in the use position (P3) and fixes it by locking the locking piece (23) of the locking device (21), The workbench described in claim 3, characterized in that the support side handrail (12) is provided with a storage locking device (19) that receives the tip (11b) of the no-pass bar (11) in the storage position (P1) and secures it by locking the locking piece (23) of the locking device (21).

5. One of the pair of second handhold rods (7a, 7b) is a support handhold rod (12) and the other is a receiving handhold rod (13), and the support handhold rod (12) is provided with a guide means (17M) extending in the longitudinal direction, The no-passing bar (11) is configured such that, when in the use position (P3), its tail end (11a) is positioned in the vertical middle of the support-side handrail (12) and its tip end (11b) is overlapped with the receiving-side handrail (13), and a pivot (14M) is provided near the tail end (11a) and is supported by the guide means (17M) so as to be rotatable and slidable. The state in which the no-passing bar (11) is moved in the vertical direction of the opening (10) by sliding via the guide means (17M) and is set to a position crossing the opening (10) is defined as an intermediate position (P2) of the no-passing bar (11), The guide means (17M) slides from the intermediate position (P2) to move the no-passing bar (11) to the vertical center of the opening (10) so that the tip (11b) overlaps the receiving handhold rod (13), thereby assuming the use position (P3).

3. The workbench according to claim 1, wherein the workbench is configured to be set in the storage position (P1) by rotating the no-passing bar (11) around the pivot (14M) from the intermediate position (P2) to overlap the support-side handrail (12).

Images