Work footstool

Abstract

To provide a work footstool for high place work.SOLUTION: A work footstool is provided with four leg parts (2) arranged in an X direction and a Y direction apart from each other to support a top board (1), the X direction and the Y direction being orthogonal to each other on a flat surface of the top board. The leg part (2) is configured to be a telescopic leg by slidably inserting a lower leg (4) erected from a seat part placed on a floor surface relating to an upper leg (3) arranged downward rightly from the top board (1), and having a lock mechanism (6) securely locking both legs not to allow them to slide. For four lower legs, two lower legs (4, 4) adjacent to each other in the X direction are connected with a lower connection rod (8) as well as, for four upper legs, two upper legs (3, 3) adjacent to each other in the Y direction are connected with an upper rod (7). The lock mechanism (6) is provided on the upper connection rod (7) and is configured to release fixation lock by moving an operation body (15) provided at a specific position of the upper connection rod in a specific direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a work platform that enables a worker to work at height by standing on the top plate. [Background technology]

[0002] Conventionally, various types of work platforms have been provided, but in order to form the top plate flat with a comparatively large area and to enable a stable installation state, it is preferable to configure it generally in a box shape as a whole. Also, in order to enable work at different height positions, it is preferable to configure the top plate so that it can be held at different heights, high and low.

[0003] In this regard, a work platform made entirely of synthetic resin and shaped like a box is known (Patent Document 1). This work platform has side panels between a top panel and a bottom panel, which are rectangular and arranged vertically. A pair of opposing side panels form a folding side panel that can be folded in half vertically toward the inside, and another pair of opposing rigid side panels form a supporting side panel that can be rotated toward the internal space of the box. By extending the folding side panels and fitting the supporting side panels between the top panel and the bottom panel, a high platform is provided with the top panel held at a high position. Also, by releasing the fitting of the supporting side panels and storing them between the top panel and the bottom panel, and bending the folding side panels to join the top panel and the bottom panel, a low platform is provided with the top panel held at a low position.

[0004] However, in order to change the work platform of Patent Document 1 from a low platform to a high one, the top plate must be raised by extending the folding side plates, and then the supporting side plates must be fitted between the raised top plate and the bottom plate, which is a complicated and labor-intensive process. Furthermore, if the supporting side plates are not fitted completely, there is a risk that the supporting side plates will come off and the top plate will fall while a worker is standing on the top plate.

[0005] In addition, to change from a high platform to a low one, the supporting side panels must be removed and then the top and bottom panels must be brought together via the bent folding side panels. This not only makes the process complicated, but also poses the risk of injury to the worker's fingers if they become pinched between the bent folding side panels or the top and bottom panels.

[0006] The applicant has provided a step stool that is composed of an upper base having a top plate and a lower base disposed below the upper base, and that holds the top plate at different heights by moving the upper base relative to the lower base (Patent Document 2). According to this, a plurality of upper legs are provided at intervals on the upper base, and a plurality of lower legs are provided at intervals on the lower base, and the top plate can be held at a low position by storing the upper legs between adjacent lower legs and storing the lower legs between adjacent upper legs. Then, the top plate can be held at a high position by lifting the upper base and supporting the upper legs on the lower legs.

[0007] However, while the work platform in Patent Document 2 is highly functional, when the top plate is held at a high position, the upper legs stored between the lower legs are raised together with the upper platform, and the upper legs must be supported on the lower legs, requiring the upper platform to be rotated. Moreover, the platform has many components (components) and a complex structure, resulting in a relatively high cost. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 4469483 [Patent Document 2] Patent No. 5400752 Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention provides a work platform having a simple structure and low cost, in which the legs supporting the tabletop are made up of four telescopic legs, consisting of upper and lower legs that are inserted so as to slide freely, and the tabletop is held at a high position by raising the upper legs and extending the legs.By minimizing the number of connecting bars connecting adjacent legs, the present invention provides a work platform having a simple structure and low cost, and furthermore, a locking mechanism that locks the telescopic legs so that they cannot slide against each other when extended is easy to use and allows for safe locking. [Means for solving the problem]

[0010] Therefore, the present invention is configured as a means for solving the above-mentioned problems in that the tabletop is supported in a height-adjustable manner by four legs arranged at a distance from each other in the X and Y directions, which are orthogonal to each other on the plane of the tabletop, the legs include upper legs suspended from the tabletop and lower legs standing from a seat placed on the floor surface, and the lower legs are inserted slidably into the upper legs to form telescopic legs, and a locking mechanism is provided to fix and lock the legs so that they cannot slide relative to each other when both legs are extended, the four lower legs constituting the four legs are connected by a lower connecting bar to two lower legs adjacent in the X direction, and the four upper legs constituting the four legs are connected by an upper connecting bar to two upper legs adjacent in the Y direction, and the locking mechanism is configured to release the fixation lock by moving an operating body provided at a predetermined position of the upper connecting bar in a predetermined direction.

[0011] In a preferred embodiment of the present invention, the locking mechanism is composed of a rod that is freely movable back and forth in the Y direction and has a locking means at its tip that engages with the lower leg by moving forward and releases the lock by moving backward, a spring that resiliently urges the rod in the forward direction, the operating body, and an interlocking means that moves the rod backward against the spring when the operating body is moved in a predetermined direction.

[0012] In this case, it is preferable that the lower leg has a groove formed by recessing inward the wall portion facing the rod among the tubular wall inserted into the upper leg, and that a locking hole is provided at the bottom of the groove for inserting and locking the locking means of the rod so that it can be freely inserted and removed.

[0013] Furthermore, in a preferred embodiment of the step stool, a first lower unit and a second lower unit, each of which is composed of two lower legs and a lower connecting bar, are arranged at a distance in the Y direction, and the outer parts of the lower connecting bars of the first lower unit and the second lower unit are provided with an engaging portion and an engaged portion, which can be freely engaged with each other and disengaged. Effect of the Invention

[0014] According to the present invention, in a work platform where the height of the platform can be changed by arranging four legs 2 supporting the platform 1 at a distance in the X and Y directions and configuring each body 2 with an extendable upper leg 3 and a lower leg 4, two of the four lower legs 4 adjacent in the X direction are connected by a lower connecting bar 8, and two of the four upper legs 3 adjacent in the Y direction are connected by an upper connecting bar 7, and a locking mechanism 6 is provided on the upper connecting bar 7. This configuration minimizes the number of connecting bars for connecting adjacent legs, making it possible to provide a work platform with a simple structure and low cost. The locking mechanism 6, which locks the extendable legs so that they cannot slide against each other when extended, has the advantage of being easy to use and enabling a fixed lock state with high safety. [Brief description of the drawings]

[0015] [Figure 1] 1A and 1B show a work platform according to an embodiment of the present invention, in which FIG. 1A is a perspective view showing a state in which the top plate is held at a low position, and FIG. 1B is a perspective view showing a state in which the top plate is held at a high position. [Diagram 2] 1 is a perspective view showing an upper unit including a tabletop, upper legs, and upper connecting bars, and a lower unit including a lower leg and lower connecting bars, separated into upper and lower halves. FIG. [Diagram 3]Regarding the upper and lower legs that make up the leg portion, (A) is a cross-sectional view showing the upper and lower legs separated, and (B) is a cross-sectional view showing the lower leg inserted into the upper leg. [Figure 4] FIG. 13 is a perspective view of an embodiment of a locking mechanism with components of the locking mechanism disassembled relative to an upper structure. [Diagram 5] FIG. 4 is a perspective view showing the operation of components that configure the lock mechanism. [Figure 6] 13 is a perspective view showing a state in which a locking mechanism is attached to an upper connecting bar between adjacent legs of the footstool in the Y direction. FIG. [Figure 7] Regarding the function of the step stool, (A) is a cross-sectional view showing the state in which the top plate is held in a low position and the upper and lower legs are fixed and locked by the locking mechanism, and (B) is an enlarged cross-sectional view showing the relationship between the legs and the locking means. [Figure 8] Regarding the operation of the footstool, (A) is a cross-sectional view showing the state in which the locking mechanism is released and the upper legs are raised above the lower legs, and (B) is an enlarged cross-sectional view showing the relationship between the legs and the locking means. [Figure 9] Regarding the function of the step stool, (A) is a cross-sectional view showing the state in which the top plate is held in a high position and the upper and lower legs are fixed and locked by the locking mechanism, (B) is an oblique view showing the locking holes of the lower legs, and (C) is a cross-sectional view showing a preferred embodiment of the safety member. [Figure 10] 13 is a perspective view showing an engaging portion and an engaged portion provided on a lower connecting rail of two steps. FIG. [Figure 11] 13 is a cross-sectional view showing the state in which two step stools are integrally connected by engaging an engaging portion with an engaged portion. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0017] (Basic configuration) 1 and 2, the work platform is supported by four legs 2 spaced apart from each other in the X and Y directions, which are orthogonal to each other on the plane of the top plate 1, so that the height of the top plate 1 can be freely changed. Fig. 1(A) shows the state when the top plate 1 is supported at a low position L, and Fig. 1(B) shows the state when the top plate 1 is supported at a high position H.

[0018] In the illustrated embodiment, the tabletop 1 is formed of a thick, substantially rectangular plate having side edges parallel to the X and Y directions, and legs 2 are provided below the four corners of the tabletop 1.

[0019] Each of the four legs 2 has an upper leg 3 that hangs down from the tabletop 1 and a lower leg 4 that stands up from a seat 5 that is placed on the floor. The lower legs 4 are inserted into the upper legs 3 so that they can slide freely, forming telescopic legs. A locking mechanism 6 is provided to lock both legs 3, 4 in place so that they cannot slide.

[0020] The locking mechanism 6 is provided to fix and lock both legs when at least the upper leg 3 and the lower leg 4 are extended, that is, when the tabletop 1 is raised to the high position H. In the illustrated embodiment, as described below, the locking mechanism 6 is configured to fix and lock both legs even when the legs 3 and the lower leg 4 are retracted, that is, when the tabletop 1 is lowered to the low position L.

[0021] As shown in the figure, of the four upper legs 3 constituting the four leg portions 2, two adjacent upper legs 3, 3 in the Y direction are connected by an upper connecting bar 7. In other words, no connecting bar is provided in the X direction.

[0022] On the other hand, of the four lower legs 4 constituting the four leg portions 2, two lower legs 4, 4 adjacent to each other in the X direction are connected by a lower connecting bar 8. In other words, no connecting bar is provided in the Y direction.

[0023] In this case, the upper connecting bar 7 preferably connects the upper legs 3, 3 near their lower ends, and the lower connecting bar 8 preferably connects the lower legs 4, 4 near their lower ends.

[0024] 2 and 3, the upper leg 3 is formed from an extrusion of a metal such as aluminum, and includes a tubular portion 3a having a substantially rectangular cross section, and a bifurcated wall 3b protruding from the side surface of the tubular portion 3a. The upper legs 3, 3 adjacent to each other in the Y direction are arranged with the bifurcated walls 3b, 3b facing each other, and are connected by fitting both ends of the upper connecting bar 7 into the bifurcated walls 3b, 3b and fixing them with fastening means such as rivets.

[0025] In contrast, the lower leg 4 is formed from an extrusion molding material made of a metal such as aluminum, and forms a cylindrical body that is slidably fitted into the cylindrical portion 3a of the upper leg 3, and a groove portion 4a is formed by recessing the cylindrical wall of the cylindrical body facing in the Y direction inward.

[0026] The lower leg 4 has a flat seat 5 attached to its lower end, and a connecting metal fitting 9 is provided directly above the seat 5, through which the end of the lower connecting bar 8 is attached and fixed. The connecting metal fitting 9 can be formed by cutting the extrusion material constituting the upper leg 3 into a short length. That is, the connecting metal fitting 9 has a tubular portion 9a and a bifurcated wall 9b. The lower end vicinity of the lower leg 4 is inserted into the tubular portion 9a and fixed with a fastening means such as a rivet, and the bifurcated wall 9b faces in the X direction. As a result, the lower legs 4, 4 adjacent to each other in the X direction are arranged with the bifurcated walls 9b, 9b facing each other, and are connected by inserting both ends of the lower connecting bar 8 into the bifurcated walls 9b, 9b and fixing them with a fastening means such as a rivet.

[0027] As shown in Figure 2, which shows the upper legs 3 and lower legs 4 that make up the leg section 2 separated, the work platform is made up of an upper unit 10 having the top plate 1, four upper legs 3, and two upper connecting bars 7, and a lower unit 11 having the four lower legs 4 with the seat section 5, and two lower connecting bars 8.

[0028] Furthermore, the lower unit 11 is composed of a first lower unit 11A and a second lower unit 11B, each of which has two lower legs 4 and a lower connecting bar 8, and the first lower unit 11A and the second lower unit 11B are arranged at a distance from each other in the Y direction.

[0029] (locking mechanism) 4 to 6 show a preferred embodiment of the locking mechanism 6 provided on the upper connecting bar 7. FIG.

[0030] The locking mechanism 6 is composed of a pair of rods 12, 12 that are freely movable back and forth in the Y direction, locking the upper leg 3 and the lower leg 4 together by moving forward and releasing the lock by moving backward, a spring 13 that resiliently biases each rod in the forward direction, a support member 14 that supports each rod below the upper connecting bar 7 so that they can move forward and backward, an operating body 15 that is located below the upper connecting bar 7 and releases the lock by moving upward, and an interlocking means 16 that moves the rods 12, 12 backward against the spring 13 when the operating body 15 is moved upward.

[0031] In the illustrated embodiment, the operating body 15 is provided below the upper connecting bar 7 and configured to release the fixing lock by moving upward, which has the advantage that when raising the upper unit 10 as described below, the user can lift the upper connecting bar 7 while moving their fingers upward along the underside of the operating body 15. However, the present invention is not limited to this configuration, and the operating body 15 may be installed above or to the side of the upper connecting bar 7. The moving direction of the operating body 15 for releasing the fixing lock may be any direction as long as it moves in a predetermined direction, and is not limited to upward movement, and may be configured to move downward, sideways, or even in a rotational direction to retract the rod 12.

[0032] In the illustrated embodiment, a downward-facing mounting base 17 is fixedly provided in the longitudinal center of the upper connecting rail 7, and interlocking means 16, 16 are rotatably supported on both sides of the mounting base 17 via pivots 18. The interlocking means 16 is composed of a bell crank equipped with an operating arm 16a and a driven arm 16b, and the tail end of the rod 12 is loosely engaged with the driven arm 16b.

[0033] The rod 12 is inserted through the insertion passage of a support member 14 fixed to the underside of the upper connecting bar 7, and is urged in the forward direction toward the upper leg 3 by a spring 13 consisting of a coil spring provided at the insertion portion, and the locking means 12a provided at the tip is inserted into the insertion hole 3c of the upper leg 3 (see Figures 3 and 4).

[0034] The operating body 15 includes a drive unit 15a that pushes an operating arm 16a of the interlocking means 16 by moving upward, and a support unit 15b that includes a guide means 15c such as a slit that is supported on the mounting base 17 so as to be freely movable up and down.

[0035] In the illustrated embodiment, the operating body 15 is supported so as to be movable up and down by inserting a support pin 19 provided on the mounting base 17 and the upper connecting rail 7 into the guide means 15c.

[0036] Normally, the rod 12 is resiliently biased in the forward direction by the spring 13, and the driven arm 16b follows this to rotate the interlocking means 16, and the operating arm 16a presses down the operating body 15. At this time, as will be described later, the locking means 12a of the rod 12 is inserted and locked into the locking hole of the lower leg 4, and the upper leg 3 and the lower leg 4 are fixed and locked.

[0037] When the operating body 15 is pushed up from this state, the driving section 15a of the operating body 15 rotates the interlocking means 16, and the driven arm 16b pulls the rod 12 against the spring 13, causing the locking means 12a of the rod 12 to retreat and escape from the engagement hole of the lower leg 4, and releasing the fixed lock of the upper leg 3 and the lower leg 4. In other words, this allows the upper leg 3 and the lower leg 4 to slide freely and expandably.

[0038] (action) As described above, the work platform is configured so that the height of the top plate 1 can be freely changed by extending and retracting the upper leg 3 and lower leg 4 that constitute the extendable legs of the leg section 2. Therefore, the top plate 1 is configured so that it can be supported at a selected height, such as the low position L shown in Fig. 1(A) and the high position H shown in Fig. 1(B). At that time, the locking mechanism 6 fixes and locks the upper leg 3 and lower leg 4 so that they cannot be extended or retracted, allowing the worker to work safely on the top plate 1.

[0039] Fig. 7 shows the state in which the tabletop 1 is supported at the low position L, and the legs 2 are contracted with the upper leg 3 and the lower leg 4 constituting the telescopic legs. In this case, if the lower end 3e of the upper leg 3 is configured to be placed on the tubular portion 9a of the connecting fitting 9 as shown in Fig. 7(B), the load of the tabletop 1 can be favorably supported.

[0040] In this state, the rod 12 of the locking mechanism 6 is advanced toward the leg 2 by the spring 13, and the locking means 12a at the tip of the rod is inserted through the insertion hole 3c of the upper leg 3, and is inserted and locked into the low-position locking hole 20a formed in the bottom of the groove 4a of the lower leg 4. Therefore, when carrying the work platform with the top plate 1 supported in the low position L, for example, when a worker grasps a component of the upper unit 10 (the top plate 1 or the upper connecting rail 7) and lifts it, the lower unit 11 is also lifted integrally.

[0041] When the rod 12 is advanced to a predetermined position, the lock mechanism 6 moves the operating body 15 downward via the interlocking means 16, and causes the operating body 15 to wait at a predetermined waiting position P1.

[0042] Therefore, as shown in FIG. 8, when the operating body 15 is pushed upward, the rod 12 is moved backward against the spring 13 via the interlocking means 16, causing the locking means 12a to retreat and escape from the insertion hole 3c of the upper leg 3, thereby releasing the fixed lock.

[0043] Therefore, when an operator places both hands on the pair of upper connecting bars 7, 7 that constitute the upper unit 10 and pushes the operating bodies 15 of the respective locking mechanisms 6, 6 to move them up to the operating position P2 and lift the upper connecting bars 7, 7, the upper unit 10 can be raised toward the high position H, as shown in Fig. 8. At this time, the rod 12 is raised together with the upper connecting bar 7 and the upper leg 3 with the locking means 12a at its tip aligned with the inside of the groove 4a of the lower leg 4.

[0044] 8 and 9, when the tabletop 1 reaches the high position H, the bottom of the groove 4a of the lower leg 4 has a high-position locking hole 20b at a location facing the locking means 12a. Therefore, when the tabletop 1 is raised to the high position H and the pushing movement of the operating body 15 is released, the rod 12 moves forward by the spring 13, and the locking means 12a at the tip is inserted and locked into the high-position locking hole 20b, and the upper leg 3 and the lower leg 4 are fixed and locked so that they cannot be extended or retracted. This allows the worker to work safely on the tabletop 1.

[0045] As a result of the rod 12 moving forward as described above, the operating body 15 is moved downward via the interlocking means 16 and returns to the original standby position P1.

[0046] Therefore, when lowering the tabletop 1 from a state in which it is supported at the high position H (FIGS. 1(B), 9) to the low position L (FIGS. 1(A), 7), the worker places both hands on the upper connecting bars 7, 7, and in a state in which the fixed lock is released by pushing the operating body 15, as in the above-mentioned case, the upper unit 10 is lowered while contracting the upper leg 3 and the lower leg 4. When the tabletop 1 reaches the low position L, the lower end 3e of the upper leg 3 is placed on the tubular portion 9a of the connecting fitting 9, as described above. Furthermore, when the pushing of the operating body 15 is released, the rod 12 moves forward, thereby inserting and locking the locking means 12a into the locking hole 20a for the low position of the lower leg 4.

[0047] In this regard, in the illustrated embodiment, the locking mechanism 6 is configured to fix and lock the top plate 1 at two height positions, high position H and low position L, but it may also be configured to be able to fix and lock the top plate 1 at three or more height positions by providing additional locking holes in the lower legs 4 between the locking holes 20a for the low position and the locking holes 20b for the high position.

[0048] In a preferred embodiment, the high-position locking hole 20b is provided with a safety member 21 below the hole, as shown in Fig. 9(B). The safety member 21 is composed of a metal fitting fixed to the bottom of the groove 4a directly below the locking hole 20b, and has a visor-shaped support part 21a facing the lower surface of the locking means 12a of the rod 12.

[0049] Therefore, even if, with the tabletop 1 supported at the high position H, an unexpected external force is received and the operating body 15 moves upward, causing the tip of the locking means 12a to nearly escape from the high-position engagement hole 20b, the tip of the locking means 12a is prevented from moving downward by being placed on the support portion 21a of the safety member 21, so there is no danger of the upper unit 10 suddenly falling together with the tabletop 1.

[0050] In this case, the safety member 21 can be configured as in the embodiment shown in Figure 9 (C), in which case a guide portion 21b is formed that extends from the support portion 21a to the lower end and is made of a tapered surface that continues diagonally downward to the bottom of the groove portion 4a.

[0051] According to this embodiment, when the upper unit 10 is being raised, even if the pushing motion of the operating body 15 is released and the tip of the locking means 12a of the rod 12 moves while sliding against the bottom of the groove portion 4a in abutment therewith, as shown by the dotted line, the tip of the locking means 12a rides up onto the guide portion 21b, causing the rod 12 to move backward against the spring 13, and as soon as the locking means 12a faces the locking hole 20b, it can be inserted and locked into the locking hole 20b.

[0052] (Configuration for connecting multiple work platforms) As shown in Figures 10 and 11, the work platform is configured so that a plurality of platforms can be used in a linked state.

[0053] In the illustrated example, a step stool with the top plate 1 supported at high position H and a step stool with the top plate 1 supported at low position L are connected side by side, allowing a worker to get from the top plate 1 at low position L forming a staircase to the top plate 1 at high position H. However, multiple step stools connected side by side can also be arranged so that the top plates 1 are aligned at the same height (low position L or high position H), in which case the multiple top plates 1 can provide a wide floor surface for work.

[0054] To enable such connection, as shown in Fig. 2, an engaging portion 22A and an engaged portion 22B that can be engaged with and disengaged from each other are provided on the outer sides of the lower connecting bars 8, 8 of the first lower unit 11A and the second lower unit 11B. In the illustrated embodiment, the engaging portion 22A is formed by a dovetail-shaped recess, whereas the engaged portion 22B is formed by a protrusion that engages with the recess to prevent it from coming off.

[0055] Therefore, in the illustrated embodiment, the engaging portion 22A and the engaged portion 22B are engaged with each other by fitting them into each other from above and below. However, as long as they can be engaged with each other freely and detachably, they are not limited to a configuration of a recess and a protrusion.

[0056] 11, the engaging portion 22A and the engaged portion 22B for connecting work stools are provided on the lower connecting bars 8, 8 of the lower unit 11, so that multiple stools arranged side by side can always be easily connected to each other. In other words, the lower connecting bars 8, 8 between adjacent stools are always located at the same height, so that even if one stool supports the top plate 1 at high position H and the other stool supports the top plate 1 at low position L, as shown in the figure, the engaging portion 22A and the engaged portion 22B can be appropriately engaged with each other by simply lifting one stool slightly and then lowering it.

[0057] Moreover, when multiple steps are connected side by side, the upper connecting rail 7 equipped with the locking mechanism 6 of each step has an open outer space, so that the top plate 1 of any step can be raised or lowered between the high position H and the low position L by operating the operating body 15 while the steps are connected. [Explanation of symbols]

[0058] 1. Top plate 2 legs 3 upper leg 3a Cylindrical part 3b bifurcated wall 3c Insertion hole 3e bottom edge 4 lower legs 4a Groove 5 Seat 6 Locking mechanism 7 Upper connecting rail 8 Lower connecting rail 9 Connecting fittings 9a Cylindrical part 9b bifurcated wall 10 Upper unit 11 Lower unit 11A First Lower Unit 11B Second lower unit 12 Rod 12a Locking means 13. Spring 14 Support member 15 Control unit 15a Drive unit 15b Support part 15c Guide means 16 Linkage means 16a Actuating arm 16b Follower arm 17 Mounting base 18 Axis 19 Support pin 20a Locking hole for low position 20b High position locking hole 21 Safety components 21a Support part 21b Guide part 22A Engagement part Engaged portion 22B

Claims

1. In a configuration in which a tabletop (1) is supported by four legs (2) spaced apart from each other in the X and Y directions, the X and Y directions being mutually orthogonal to each other on the plane of the tabletop, such that the tabletop is adjustable in height, The legs (2) include upper legs (3) suspended from the tabletop (1) and lower legs (4) rising from the seat part placed on the floor surface, and the lower legs are slidably inserted into the upper legs to form telescopic legs. A locking mechanism (6) is provided to fix and lock both legs so that they cannot slide relative to each other when extended. The four lower legs constituting the four leg portions are connected by a lower connecting bar (8) between two lower legs (4, 4) adjacent to each other in the X direction. The four upper legs constituting the four leg portions are connected by an upper connecting bar (7) between two upper legs (3, 3) adjacent to each other in the Y direction. The locking mechanism (6) is configured to release the fixed lock by moving an operating body (15) provided at a predetermined position of the upper connecting bar (7) in a predetermined direction.

2. The work platform described in claim 1, characterized in that the locking mechanism (6) is composed of a rod (12) having a locking means (12a) at its tip that is freely movable back and forth in the Y direction, engages with the lower leg (4) by moving forward and releases the locking means by moving backward, a spring (13) that resiliently urges the rod in the forward direction, the operating body (15), and an interlocking means (16) that moves the rod (12) backward against the spring (13) when the operating body (15) is moved in a predetermined direction.

3. The work platform described in claim 2, characterized in that the lower leg (4) is formed by recessing inward the wall portion facing the rod (12) of the tubular wall inserted into the upper leg (3), forming a groove portion (4a), and providing a locking hole (20b) at the bottom of the groove portion (4a) into which the locking means (12a) of the rod (12) can be inserted and locked in a removable manner.

4. a first lower unit (11A) and a second lower unit (11B), each of which is constituted by two lower legs (4, 4) and a lower connecting bar (8), are disposed apart from each other in the Y direction; A work platform as described in claim 1, 2 or 3, characterized in that the outer parts of the lower connecting bars (8) of the first lower unit (11A) and the second lower unit (11B) are provided with an engaging part (22A) and an engaged part (22B) which can be freely engaged with each other and disengaged.

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