Elevated work platform, method of using the same and fall prevention structure

Abstract

To provide an elevated work platform that reduces burden of preparatory work before use, and a method for using an elevated work platform.SOLUTION: An elevated work platform 10 comprises: a base 20 having wheels 202; a support 30 with its lower end fixed to the base 20 and manually extendable in a vertical direction; a foldable work floor 70 which is supported by the support 30 and on which an operator can ride; and a reinforcement member 80 with its upper end attached to the work floor 70 and its lower end attached to the support 30, the reinforcement member being bendable.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an elevated work platform, a method for using an elevated work platform, and a fall prevention mechanism. [Background technology]

[0002] Patent Document 1 describes a mobile elevated work platform that can ensure good workability regardless of the presence of obstacles on the floor surface. This mobile elevated work platform includes a first telescopic column fixed upright on a first traveling base, a second telescopic column fixed upright on a second traveling base, and a lifting floor that connects the first telescopic column and the second telescopic column in a bridge-like manner, and the lifting floor includes a first folding floor connected to the first telescopic column so as to be freely raised and lowered, a second folding floor connected to the second telescopic column so as to be freely raised and lowered, and a first folding floor and a second folding floor that are connected to the second telescopic column so as to be freely raised and lowered, and a first folding floor and a second folding floor that are connected to the first telescopic column so as to be freely raised and lowered, and a first folding floor and a second folding floor that are connected to the second telescopic column so as to be freely raised and lowered. a first link member that maintains the posture of the intermediate member when the first folding bed is raised or lowered; a second link member that maintains the posture of the intermediate member when the second folding bed is raised or lowered; a first hoisting drive means that drives the first folding bed to raise or lower; a second hoisting drive means that drives the second folding bed to raise or lower; and a hoisting drive control means that enables the first hoisting drive means and the second hoisting drive means to be driven in conjunction with each other.

[0003] Patent Document 2 describes a folding aerial work platform that provides robust support for the work platform during high-altitude work, allows smooth, easy, and safe operation when unfolding and folding the work platform, and can be folded compactly. This folding aerial work platform includes a fixed top plate supported by main legs, a rotating top plate pivotally connected to at least one side of the fixed top plate so as to be rotatable between a horizontal position and a hanging position, and support legs that support the rotating top plate in the horizontal position, the support legs are equipped with runnable casters and are connected to the main legs via a diagonal brace-type connecting mechanism, and are connected to the main legs so as to be movable in the near and far directions by expanding and contracting the connecting mechanism, and the rotating top plate is provided with guide means for guiding the upper end of the support legs in the near and far directions, and is configured to prevent the upper end of the support legs from swinging left and right. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 8-296324 [Patent Document 2] JP 2015-105544 A Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide an aerial work platform and a method of using an aerial work platform that reduce the burden of preparation work required before use. Another object of the present invention is to provide a fall prevention mechanism that prevents a lifting member that is manually raised and lowered from falling. [Means for solving the problem]

[0006] The invention described in claim 1 is an aerial work platform comprising a base having wheels, a support part whose lower end is fixed to the base and which can be manually extended and retracted in the vertical direction, and a foldable work floor part supported by the support part and on which a worker stands.

[0007] The invention described in claim 2 is the aerial work platform described in claim 1, further comprising a bendable reinforcing member whose upper end is attached to the work floor portion and whose lower end is attached to the support portion.

[0008] The invention described in claim 3 is the aerial work platform described in claim 2, wherein the support parts each have a fixed side member fixed to the base and an extendable side member that moves in an upward and downward direction relative to the fixed side member and supports the work floor part, and has a pair of support members arranged at intervals in a first direction, an auxiliary part that applies force in a direction to move the extendable side member upward, and handles provided on each of the extendable side members for a worker to place his or her hand on to apply force in the upward and downward directions.

[0009] The invention described in claim 4 is the aerial work platform described in claim 3, wherein the support portion further comprises a fall prevention mechanism that limits the downward movement of the extendable side member.

[0010] The invention described in claim 5 is the aerial work platform described in claim 4, wherein the fall prevention mechanism comprises a protrusion forming member provided on the fixed side member and having multiple protrusions formed at intervals in the vertical direction, a claw member provided on the extendable side member and capable of resting on the protrusion, a first spring that applies force in a direction to bring the claw member into contact with the protrusion forming member, a stopper that can move in the vertical direction and hold the claw member resting on the protrusion in a lowered position, a second spring that applies force in the direction in which the stopper descends, and a lock release lever that can raise the stopper.

[0011] The invention described in claim 6 is the aerial work platform described in claim 5, wherein the lock release lever is disposed in a position where it can be operated by a worker with his / her hand on the handle.

[0012] The invention described in claim 7 is the aerial work platform described in claim 6, wherein the support part further has a stabilization mechanism that reduces shaking caused by a gap between the extendable side member and the fixed side member.

[0013] The invention described in claim 8 is the aerial work platform described in claim 7, wherein the stabilization mechanism has an eccentric member that can rotate eccentrically around a rotation axis provided on the telescopic side member, and an operating member that rotates the eccentric member, and depending on the rotational position of the eccentric member, the outer circumferential surface of the eccentric member can come into contact with the fixed side member.

[0014] The invention described in claim 9 is the aerial work platform described in claim 8, wherein the work floor section has a first divided work floor and a second divided work floor arranged side by side in a second direction intersecting the first direction, The first and second divided work floors each rotate around a rotation axis that is provided at the upper end of the support portion and extends at a distance in the second direction, and the reinforcing member bends, thereby folding the work floor portions.

[0015] The invention described in claim 10 is a high-altitude work platform described in claim 9, further comprising a ladder section for a worker to climb up to the work floor section, the ladder section being provided on the work floor section and having an upper rung that functions as at least the topmost rung, and a detachable ladder that is detachably connected to the rung.

[0016] In the aerial work platform according to claim 11, the width of the upper rung is wider than the width of the rung of the detachable ladder.

[0017] The invention described in claim 12 is a method of using the aerial work platform described in claim 6, including the steps of hooking a finger on the lock release lever while placing a palm of the hand on the underside of the handle, gripping the lock release lever to lower the lock release lever, and applying an upward force to the handle while the lock release lever is lowered.

[0018] The invention described in claim 13 is a fall prevention mechanism comprising a protrusion-forming member having a plurality of protrusions formed at intervals in the vertical direction, and a descent limiting portion provided on a lifting member that rises and falls relative to the protrusion-forming member and that can limit the descent of the lifting member by engaging with the protrusions, wherein the descent limiting portion has a claw member that can rest on the protrusions, a first spring that applies a force in a direction that brings the claw member into contact with the protrusion-forming portion, a stopper that can move in the vertical direction and keep the claw member resting on the protrusions in a lowered position, a second spring that applies a force in the direction that the stopper descends, and a lock release lever that can raise the stopper. Effect of the Invention

[0019] According to the present invention, it is possible to provide an aerial work platform and a method of using an aerial work platform that reduce the burden of preparation work before use. Furthermore, according to the present invention, it is possible to provide a fall prevention mechanism that prevents a lifting member that is manually raised and lowered from falling. [Brief description of the drawings]

[0020] [Figure 1] 1 is an explanatory diagram showing a state in which an elevated work platform according to an embodiment of the present invention is used; [Diagram 2] 10 is an explanatory diagram of a fall prevention mechanism and a stabilization mechanism when using the aerial work platform. FIG. [Diagram 3] 13 is an explanatory diagram showing the operation of the fall prevention mechanism and stabilization mechanism when raising the work floor portion of the aerial work platform. FIG. [Figure 4] This is an explanatory diagram (part 1) showing how to use the aerial work platform. [Diagram 5] This is an explanatory diagram (part 2) showing how to use the same aerial work platform. [Figure 6] This is an explanatory diagram (part 3) showing how to use the same aerial work platform. [Figure 7] This is an explanatory diagram (part 4) showing how to use the same aerial work platform. [Figure 8] This is an explanatory diagram (part 5) showing how to use the same aerial work platform. [Figure 9] This is an explanatory diagram (part 6) showing how to use the same aerial work platform. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Next, embodiments of the present invention will be described with reference to the attached drawings to facilitate understanding of the present invention. Note that parts not relevant to the description may be omitted from the drawings.

[0022] The elevated work platform 10 according to one embodiment of the present invention is used for performing a predetermined work at an elevation of, for example, 2 m or more above the ground. The predetermined work is, for example, ceiling finishing work, interior wall surface work, piping work, etc. in construction work, etc.

[0023] For convenience of explanation, an orthogonal coordinate system consisting of mutually intersecting X-axis, Y-axis, and Z-axis is introduced as shown in Fig. 1, and directions may be explained based on this orthogonal coordinate system. However, the "orthogonal" in the orthogonal coordinate system does not have a strict meaning, but rather means "substantially orthogonal." The direction in which the X-axis extends is the direction in which a worker ascends and descends to the aerial work platform 10 in a plan view, and the direction in which the Z-axis extends is the up-down direction.

[0024] The aerial work platform 10 comprises a base portion 20, a support portion 30, a work floor portion 70, a plurality of reinforcing members 80 and a ladder portion 90. The base 20 has wheels 202 and can move on a floor or the ground. The base 20 is provided with outriggers 204 that can be folded by rotating around a rotation axis that extends in the vertical direction. The distance between the ground contact points (four points in total) of each outrigger 204 when deployed from the folded state is longer in the Y-axis direction than in the X-axis direction.

[0025] The support part 30 has a lower end fixed to the base part 20 and can be lifted by hand to extend and retract in the vertical direction. The support part 30 can be extended and retracted only by human power without using any mechanical equipment such as a winch. The support section 30 includes a pair of support members 302a, 302b, an auxiliary section 304, handles 306a, 306b, drop prevention mechanisms 40a, 40b, and stabilization mechanisms 50a, 50b.

[0026] A pair of support members 302a, 302b each extend vertically at a distance from one another in the X-axis direction (an example of a first direction), and support member 302a is composed of a fixed member 308a and an extendable side member 310a, while support member 302b is composed of a fixed member 308b and an extendable side member 310b.

[0027] The fixed members 308a, 308b are each fixed to the base 20. A plurality of holes H1 are formed in the side surfaces of the fixed members 308a, 308b at preset intervals in the vertical direction. Drop prevention pins (not shown) are inserted into the holes H1, and through holes H2 through which the drop prevention pins pass are formed in the side surfaces of the telescopic members 310a, 310b.

[0028] The telescopic side members (an example of a lifting member) 310a, 310b can move up and down relative to the fixed side members 308a, 308b, respectively, and support the working platform section 70.

[0029] The auxiliary portion 304 has a lower end provided on the base portion 20 and an upper end provided on a connecting member 312 that connects the telescopic side members 310a, 310b to each other, and can apply a force in a direction that moves the telescopic side members 310a, 310b upward. The auxiliary portion 304 has a pantograph mechanism constituted by a plurality of links 314a to 314f, and a pair of gas springs 316a, 316b.

[0030] Of the links 314a to 314f, the link 314a has one end provided on the base 20, and the link 314c has a lower end connected to the upper end of the link 314a.

[0031] The lower ends of gas springs 316a, 316b are each attached to the lower end of link 314a, and the upper ends of gas springs 316a, 316b are each attached to link 314c.

[0032] The handles 306a, 306b are a pair of rod-shaped members provided on the telescopic side members 310a, 310b, respectively. Two workers can place their hands on the handles 306a, 306b to apply force in the vertical direction. The handles 306a, 306b extend laterally (in the Y-axis direction) from the telescopic members 310a, 310b, and are bent from the center to the tip side so that they face diagonally upward.

[0033] The fall prevention mechanisms 40a, 40b are provided on the support members 302a, 302b, respectively, and can restrict the downward movement of the telescopic side members 310a, 310b. The drop prevention mechanisms 40 a and 40 b each include a protrusion forming member 402 , a claw member 404 , a first spring 406 , a stopper 408 , a second spring 410 , and a lock release lever 412 .

[0034] The fall prevention mechanisms 40a and 40b are substantially identical in configuration. Since each of the fall prevention mechanisms 40a and 40b is composed of a pair of substantially identical mechanisms arranged symmetrically about the fixed members 308a and 308b, as shown in FIG. 2, only one side of the fall prevention mechanism 40b will be described below.

[0035] The protrusion-forming member 402 is provided on the fixed-side member 308b, and is a member on which a plurality of protrusions 403 are formed at intervals in the vertical direction. 2 and 3, only a part of the protrusion forming portion 402 is shown.

[0036] The claw member 404 is provided on the extendable side member 310b which rises and falls relative to the projection forming member 402. The claw member 404 can rotate around a rotation axis AX404 extending in the X-axis direction provided at the bottom, and can rest on the projection 403.

[0037] The first spring 406 is, for example, a torsion spring, and is provided on the extension-side member 310b. The first spring 406 acts to apply a force in a direction in which the claw member 404 contacts the projection forming member 402.

[0038] The stopper 408 is a plate-like or block-like member that is provided on the telescopic member 310b and can move in the vertical direction. When the stopper 408 is in the lowered position, the claw member 404 can be held in a state in which it is placed on the protrusion 403. A contact surface S with which the claw member 404 can come into contact is formed on the end face of the stopper 408. The contact surface S is a flat surface that comes into contact with the claw member 404 when the claw member 404 is in contact with the protrusion-forming member 402. The contact surface S is formed so that the surface thereof moves away from the fixed-side member 308b as it extends downward. In other words, the horizontal distance from the side surface of the fixed-side member 308b to the lower end of the contact surface S is set to be greater than the horizontal distance to the upper end of the contact surface S.

[0039] The second spring 410 is, for example, a coil spring, and is provided on the telescopic side member 310b. The second spring 410 acts to apply a force in a direction in which the stopper 408 descends.

[0040] The unlock lever 412 is a rod-shaped member provided on the telescopic side member 310b, and is located at a position where an operator can operate it with his or her hand on the handle 306b, for example, at a position higher than the handle 306b. The unlocking lever 412 can rotate around a rotation axis AX412 that is provided at the base and extends in the X-axis direction, and the part of the unlocking lever 412 that is closer to the base end than the rotation axis 412 comes into contact with the underside of the stopper 408, thereby pushing up and raising the stopper 408.

[0041] The claw member 404, the first spring 406, the stopper 408, the second spring 410 and the lock release lever 412 constitute an example of a downward movement limiting portion that can limit the downward movement of the telescopic side member 310b. The operation of the drop prevention mechanism 40b will be described later.

[0042] The stabilizing mechanisms 50a and 50b are provided on the support members 302a and 302b, respectively. Because there are gaps between the telescopic side member 310a and the fixed side member 308a, and between the telescopic side member 310b and the fixed side member 308b, which are necessary for the telescopic side members 310a and 310b to ascend and descend, respectively, the working platform 70 shakes due to these gaps. The stabilizing mechanisms 50a and 50b can reduce this shaking.

[0043] Each of the stabilizing mechanisms 50 a and 50 b includes an eccentric member 502 and an operating lever 504 . The stabilization mechanisms 50a, 50b have substantially the same configuration, so only the stabilization mechanism 50b will be described below.

[0044] The eccentric member 502 is a cylindrical or disk-shaped member that can rotate eccentrically around a rotation axis AX502 provided on the telescopic side member 310b. The eccentric member 502 is arranged so that the outer circumferential surface of the eccentric member 502 can contact the fixed side member 308b or be separated from the fixed side member 308b depending on the rotation position.

[0045] The operating lever (an example of an operating member) 504 is a rod-shaped member that rotates the eccentric member 502, and is disposed in the vicinity of the handle 306b at a lower position than the handle 306b. As shown in FIG. 3, when the operating lever 504 is pulled up, the eccentric member 502 rotates and moves away from the fixed member 308b.

[0046] 1, the work floor section 70 is supported by telescopic side members 310a, 310b of the support section 30, and forms a work surface on which a worker stands. The work surface is rectangular with the Y-axis direction as its elongated direction, and is surrounded by a removable fence 701. The work floor section 70 can be raised to a height of, for example, 2 m or more above the ground by extending the support section 30.

[0047] The work floor section 70 has a first divided work floor 702a and a second divided work floor 702b arranged side by side in the Y-axis direction (an example of the second direction), and is foldable by being divided into the first divided work floor 702a and the second divided work floor 702b, as shown in Figure 6. In detail, as shown in FIG. 4, the first divided work floor 702a and the second divided work floor 702b rotate around rotation axes AX702a and AX702b, which are provided at the upper ends of the telescopic side members 310a and 310b and extend at a distance in the Y-axis direction, respectively, and each reinforcing member 80 bends, thereby folding the work floor section 70.

[0048] Each reinforcing member 80 is a rod-shaped member having an upper end attached to the working floor portion 70 and a lower end attached to the support portion 30. Two reinforcing members 80 are provided for each of the telescopic side members 310a, 310b. Each reinforcing member 80 is bendable so that the upper side becomes convex at the middle portion in the longitudinal direction when the working platform section 70 is folded.

[0049] The ladder section 90 is for a worker to climb onto the working platform section 70, and has an upper rung 902, a detachable ladder 904, and a ladder holding member 906. The upper step 902 is provided on the work floor section 70 and functions as at least the top step. The upper step 902 can rotate about a rotation axis extending in the longitudinal direction, and is stored by rotating and moving to the back surface of the first divided work floor 702a, as shown in FIG.

[0050] The detachable ladder 904 is a ladder that can be extended and retracted in the longitudinal direction, and is detachably connected to the upper rung 902. The rungs of the detachable ladder 904 are provided at a lower position than the upper rung 902. The inclination angle of the detachable ladder 904 is also adjustable.

[0051] The ladder holding member 906 is a member that is extendable and contractable in the longitudinal direction, and as shown in Fig. 8, one end is rotatably attached to the detachable ladder 904. The other end of the ladder holding member 906 is connected to the connecting member 312 as shown in Fig. 1, thereby enabling the inclination angle of the detachable ladder 904 to be maintained.

[0052] The width of the upper step 902 is wider than the width of the step of the removable ladder 904. When a worker descends from the work platform 70, there is a high possibility that the worker will lose balance when he or she places his or her foot on the first step, so by providing the wider upper step 902, the worker can descend in a more stable position.

[0053] The ladder section 90 may also be provided on the opposite side of the support section 30. When the ladder sections 90 are provided on one side and the other side of the working floor section 70 in a plan view, each ladder section 90 functions as a member supporting the working floor section 70, and the working floor section 70 is supported more stably.

[0054] Next, the operation of the drop prevention mechanism 40b will be described with reference to FIG. The operation of the fall prevention mechanism 40b is substantially the same when the telescopic member 310b ascends and descends, so only the operation when ascending will be described. The drop prevention mechanism 40b operates in accordance with the following steps SA1 to SA4.

[0055] (Step SA1) After the operating lever 504 of the stabilizing mechanism 50b has been pulled up, the operator places his / her fingers on the lock release lever 412 while placing the palm of his / her hand on the lower side of the handle 306b. (Step SA2) When the operator grips the lock release lever 412 and lowers it, the lock release lever 412 pushes up the stopper 408 against the action of the second spring 410 . As a result, the claw member 404, whose movement has been restricted by the contact surface S of the stopper 408, becomes free. However, due to the action of the first spring 406, the claw member 404 is maintained in contact with the projection forming member 402.

[0056] (Step SA3) When the worker applies an upward force to the handle 306b while keeping the unlocking lever 412 lowered, the claw member 404 repeatedly rotates to the right and left in accordance with the shape of the protrusion 403 of the protrusion forming member 402, and the telescopic side member 310b (work floor section 70) rises.

[0057] (Step SA4) When the operator releases the lock release lever 412 at the desired height, the rotation of the claw member 404 is restricted by the contact surface S of the stopper 408. As a result, the state in which the claw member 404 is bitten into the protrusion forming member 402 is maintained, and the downward movement of the telescopic side member 310b is restricted.

[0058] Next, a method of preparing (using) the aerial work platform 10 will be described with reference to Figs. The aerial work platform 10 is prepared according to the following steps SB1 to SB8, although some steps may be performed in parallel if possible.

[0059] (Step SB1) A worker carries the aerial work platform 10 (see FIG. 4) from which the fence 701 and the detachable ladder 904 have been separated, to a predetermined position.

[0060] (Step SB2) After transportation, as shown in FIG. 5, the outriggers 204 provided on the base 20 are deployed. It should be noted that the operating levers 504 of the stabilizing mechanisms 50a and 50b are pulled up, and the eccentric members 502 are separated from the fixed members 308a and 308b (see FIG. 1).

[0061] (Step SB3)

[0062] As shown in FIG. 6, a fence 701 is attached to each of a first divided work floor 702a and a second divided work floor 702b.

[0063] (Step SB4) As shown in FIG. 7, each reinforcing member 80 is extended and the working floor section 70 is unfolded.

[0064] (Step SB5) As shown in FIG. 8, the upper step 902 is deployed and the detachable ladder 904 is connected to the upper step 902.

[0065] (Step SB6) Two workers each hold a pair of handles 306a and a pair of handles 306b, and push down the lock release lever 412 as shown in Fig. 3. When an upward force is applied to the handles 306a and 306b in this state, the operation of the auxiliary part 304 works together to raise the working platform 70 as shown in Fig. 9. When the lock release lever 412 is released at the desired height, the claw member 404 engages with the projection forming member 402, and the height of the work platform portion 70 is maintained.

[0066] (Step SB7) Drop prevention pins (not shown) are inserted into the through holes H2 (see FIG. 1) of the telescopic side members 310a, 310b and the holes H1 of the fixed side members 308a, 308b at corresponding positions. After the fall prevention device is inserted, the operating levers 504 of the stabilization mechanisms 50a, 50b are pushed down, and the eccentric members 502 come into contact with the fixed side members 308a, 308b, thereby reducing the shaking of the work platform section 70.

[0067] (Step SB8) The other end of the ladder retaining member 906 (see FIG. 1) is attached to the connecting member 312 . Thereafter, the length of the ladder holding member 906 is adjusted to adjust the inclination angle of the detachable ladder 904 and the length of the detachable ladder 904, completing preparation of the aerial work platform 10.

[0068] As described above, according to the aerial work platform 10 of this embodiment, the burden of preparation work before use is reduced, compared to an aerial work platform not configured in this manner.

[0069] Although the embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment, and all changes in conditions that do not depart from the gist of the present invention are within the scope of application of the present invention. [Explanation of symbols]

[0070] 10. Aerial work platform 20 base 30 Support part 40a, 40b Fall prevention mechanism 50a, 50b stabilization mechanism 70 Working Floor 80 Reinforcement member 90 Ladder Section 202 Wheels 204 Outrigger 302a, 302b Support members 304 Auxiliary section 306a, 306b Handle 308a, 308b Fixed side member 310a, 310b Telescopic side members 312 Connecting members 314a~314f Link 316a, 316b gas spring 402 Protrusion forming member 403 Protrusion 404 Claw member 406 First Spring 408 Stopper 410 Second Spring 412 Unlock lever 502 Eccentric member 504 Operating lever 701 Fence 702a First separate work platform 702b Second separate work platform 902 Upper tread 904 Detachable ladder 906 Ladder holding member AX404, AX412, AX502 Rotating shaft AX702a, AX702b Rotating shaft H1 hole H2 through hole S contact surface

Claims

1. a base having wheels; A support part whose lower end is fixed to the base and which can be manually extended and contracted in the vertical direction; The elevated work platform comprises a foldable work floor section supported by the support section and on which a worker sits.

2. 2. The elevated work platform according to claim 1, An elevated work platform having an upper end attached to the work floor portion and a lower end attached to the support portion, and further comprising a bendable reinforcing member.

3. 3. The elevated work platform according to claim 2, The support portion includes a pair of support members arranged at an interval in a first direction, the pair of support members each having a fixed side member fixed to the base and an extendable side member that moves in a vertical direction relative to the fixed side member and supports the work floor portion; An auxiliary part that applies a force in a direction to move the telescopic side member upward; and a handle provided on each of the extendable side members for a worker to place his or her hand on to apply force in the upward or downward direction.

4. 4. The elevated work platform according to claim 3, The support portion of the high-altitude work platform further includes a fall prevention mechanism that limits downward movement of the telescopic side member.

5. 5. The elevated work platform according to claim 4, the fall prevention mechanism is provided on the fixed member, and a protrusion forming member on which a plurality of protrusions are formed at intervals in the up-down direction; a claw member provided on the telescopic side member and capable of being placed on the protrusion; a first spring that applies a force in a direction that brings the claw member into contact with the projection-forming member; a stopper that is movable in the vertical direction and that holds the claw member on the protrusion when in a lowered position; A second spring that applies a force in a direction in which the stopper moves downward; and a lock release lever capable of raising the stopper.

6. 6. The elevated work platform according to claim 5, The lock release lever is disposed in a position where it can be operated by a worker with his / her hand on the handle.

7. 7. The elevated work platform according to claim 6, The support portion of the high-altitude work platform further includes a stabilization mechanism that reduces shaking caused by a gap between the extendable side member and the fixed side member.

8. The elevated work platform according to claim 7, The stabilizing mechanism includes an eccentric member that can rotate eccentrically around a rotation axis provided on the telescopic member; an operating member for rotating the eccentric member, An elevated work platform in which the outer circumferential surface of the eccentric member can come into contact with the fixed member depending on the rotational position of the eccentric member.

9. 9. The elevated work platform according to claim 8, The work floor section has a first divided work floor and a second divided work floor arranged side by side in a second direction intersecting the first direction, An elevated work platform in which the first and second divided work platforms each rotate around a rotation axis that is provided at the upper end of the support portion and extends at a distance in the second direction, and the reinforcing member bends, thereby folding the work platform portion.

10. 10. The elevated work platform according to claim 9, Further provided is a ladder section for a worker to climb onto the work floor section, The ladder section is provided on the work floor section, and an upper step functions as at least the uppermost step; The elevated work platform has a detachable ladder that is detachably connected to the step.

11. The elevated work platform according to claim 10, The width of the upper rung is wider than the width of the rung of the detachable ladder.

12. A method of using the elevated work platform according to claim 6, comprising the steps of: A step of placing a palm on the handle from below and hooking a finger on the lock release lever; Squeezing the lock release lever to lower the lock release lever; and applying an upward force to the handle with the lock release lever lowered.

13. a protrusion-forming member on which a plurality of protrusions are formed at intervals in the vertical direction; a lowering limiting portion that is provided on a lifting member that moves up and down relative to the protrusion forming member and that can limit the lowering of the lifting member by engaging with the protrusion, the lowering limiting portion being a claw member capable of resting on the protrusion; a first spring that applies a force in a direction that brings the claw member into contact with the protrusion forming portion; a stopper that is movable in the vertical direction and that holds the claw member on the protrusion when in a lowered position; A second spring that applies a force in a direction in which the stopper moves downward; and a lock release lever capable of lifting the stopper.

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