Movable stand

Abstract

To provide a movable frame which eliminates physical work of pulling by hands of workers in moving, reduces the used amount of a crane for moving the frame, and facilitates a fine adjustment of a position in the frame for heavy articles such as columnar structures as an object for placement.SOLUTION: A movable frame 1 includes: a placement base part 2 where an object for placement is placed; a leg part 3 which supports the placement base part 2 on the side of an upper part 31, and whose lower end part 32 is grounded on a ground side; a plurality of wheels 4 arranged on a lower part side of the leg part 3; and a switching device 5 for switching between a state in which the wheels 4 are moved to protrude below the lower end part 32 of the leg part 3 to be movable and a state in which the wheels 4 are moved to store on an upper side with respect to the lower end part 32 of the leg part 3 not to be movable.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a stand on which a heavy object such as a columnar structure is placed. [Background technology]

[0002] Conventionally, when manufacturing a steel columnar structure or the like in a factory, the columnar structure is placed on a gate-shaped pedestal. Since the columnar structure is heavy, the pedestal that supports it is designed to be sturdy, and the pedestal itself is also heavy. Patent Document 1 discloses a movable work pedestal. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 61-117830 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the pedestal becomes heavy, it is necessary to move it using a crane in the factory. In this case, if the crane is unavailable due to being used for other work, several workers have to drag the pedestal by hand, which places a heavy physical burden on the workers. Dragging the pedestal may cause it to tip over, which may require repair work. Furthermore, fine adjustments to the position of the pedestal are required to avoid contact between the small members welded to the columnar structure and the pedestal, and to place the columnar structure on the pedestal while balancing its weight. However, such fine adjustments are not easy to make by dragging the pedestal.

[0005] In view of the above circumstances, an object of the present invention is to provide a movable stand that eliminates the need for manual dragging when moving, reduces the amount of crane required to move the stand, and also makes it easy to fine-tune its position. [Means for solving the problem]

[0006] The movable stand of this invention is characterized in that it comprises a mounting platform on which an object to be placed is placed, legs supporting the mounting platform at an upper side and having their lower ends contacting the ground, a plurality of wheels arranged on the lower side of the legs, and a switching device which switches between a state in which the wheels are moved downwardly beyond the lower ends of the legs to make them movable, and a state in which the wheels are moved retracted above the lower ends of the legs to make them non-movable.

[0007] With the above configuration, when the movable pedestal is moved, the wheels can be moved downward beyond the lower ends of the legs, eliminating the need for heavy muscle labor to drag the pedestal, reducing the amount of crane required to move the pedestal, and also facilitating fine adjustment of the position of the movable pedestal. On the other hand, when an object to be placed on the movable pedestal is placed on the movable pedestal, the wheels can be moved upward beyond the lower ends of the legs, allowing the movable pedestal to stably support the object to be placed.

[0008] Each leg may be provided with the above-mentioned switching device, and a plurality of wheels may be moved by each switching device. In this way, the wheels can be moved by a smaller number of switching devices than the number of wheels.

[0009] The switching device may include an operating lever that is tilted along the outer surface of the leg on the outer surface side of the leg, and the wheel may be moved by tilting the operating lever. In this way, the operating lever does not protrude significantly outside the leg when tilted, and it is possible to reduce a situation in which the tilting operation is hindered by equipment near the movable stand.

[0010] An assisting device may be provided to assist the operation of the operation lever to move the wheels forward. This facilitates tilting the operation lever when moving the wheels forward, i.e., lifting the portion above the wheels of the movable platform. The assisting device can also prevent the portion above the wheels of the movable platform from suddenly descending when tilting the operation lever when moving the wheels back into place.

[0011] An upper portion of the operating lever serving as a handle may be located higher than the upper portion of the leg, and a lever locking portion for holding the wheel in a protruding state by the operating lever may be provided on the upper portion of the leg. In this way, since the upper portion of the operating lever serving as a handle is located higher than the upper portion of the leg, the operating lever is easy to operate, and since the lever locking portion is provided on the upper portion of the leg, the operating lever can be easily held by the lever locking portion while checking the lever locking portion.

[0012] The mounting base and the leg may be connected in a detachable manner, so that the mounting base can be replaced with one of a different size in accordance with a change in the size of the object to be mounted. Effect of the Invention

[0013] With the present invention, there is no need for the heavy lifting required to drag the movable stand, the amount of crane needed to move the stand can be reduced, and the position of the movable stand can be easily fine-tuned. Furthermore, when placing a columnar structure or the like on the movable stand, the wheels can be stored above the lower ends of the legs, so the movable stand can stably support the object to be placed on it. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a perspective view showing a movable stand according to the embodiment. [Diagram 2] FIG. 2 is a front view of the movable pedestal shown in FIG. [Diagram 3] 2 is an explanatory diagram showing the general bottom view of the movable stand shown in FIG. 1. [Figure 4] FIG. 2 is a side view of the movable pedestal shown in FIG. 1 in a wheel-retracted state. [Diagram 5] FIG. 2 is a side view of the movable pedestal shown in FIG. 1 in a wheel-projected state. [Figure 6] FIG. 2 is a side view of the movable pedestal shown in FIG. 1 in a wheel-retracted state. [Figure 7] 2 is an explanatory diagram showing a mode in which an object is supported by the movable stand shown in FIG. 1. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. As shown in Figures 1, 2 and 3, a movable platform 1 of this embodiment includes one platform 2, two legs 3, four wheels 4, and two switching devices 5 provided on each leg 3.

[0016] The placement platform 2 is a portion on which an object to be placed (such as a steel column) is placed, and is provided with a load receiving portion 21 formed of, for example, an H-shaped steel horizontally arranged with its flanges facing up and down. At the center and both ends of the load receiving portion 21, reinforcing plates 21a are fixed to the flanges and webs by welding. Also, support columns 22 are fixed by welding or the like to the upper surface of both ends of the load receiving portion 21 to prevent the object to be placed from slipping off. On the upper surface of the load receiving portion 21 and between the support columns 22, contact members 23 made of H-shaped steel smaller than the H-shaped steel of the load receiving portion 21 are provided horizontally with their flanges facing up and down, and the object to be placed is placed on the contact members 23.

[0017] An inclined surface portion 22a is formed at the upper end of the receiving pillar 22, sloping downward toward the load receiving portion 21, so that when an object to be placed suspended by a crane is lowered from above and placed on the contact member 23, the object to be placed can be easily guided toward the contact member 23.

[0018] A handle 24 is fixed to the outer surface (the surface opposite to the contact member 23) of each support column 22. The handle 24 is a portion that an operator can hold when moving the movable stand 1.

[0019] The legs 3 support the mounting table 2 at their upper portions 31, and their lower ends 32 are members that come into contact with the ground. The legs 3 are, for example, made of H-shaped steel horizontally arranged with flanges facing up and down, and the web extension direction (longitudinal direction) of the legs 3 is perpendicular to the web extension direction (longitudinal direction) of the load receiving portion 21. The upper portions 31 of the legs 3 are made of an upper flange, and the lower ends 32 are made of a lower flange. Reinforcing plates 33 are welded to the flanges and webs at the center and both ends of each leg 3. The position of the reinforcing plate 33 at the center coincides with the web position of the load receiving portion 21.

[0020] The undersides 25 of both ends of the load receiving portion 21 are separably fixed to the upper portion 31 of the leg portion 3 by bolts and nuts 11. The wheels 4 are arranged in pairs at the lower side of each leg portion 3 in the inner region of the two regions separated by the web, spaced apart in the direction in which the web extends. The running direction of the wheels 4 coincides with the direction in which the web extends (longitudinal direction) of the leg portion 3.

[0021] Each switching device 5 switches between a state in which the two wheels 4 of each leg 3 are moved downwardly beyond the lower end 32 of the leg 3 to make the movable platform 1 movable, and a state in which the two wheels 4 are moved upwardly beyond the lower end 32 of the leg 3 to make the movable platform 1 immovable, and is equipped with a swinging member 51 that swingably supports each wheel 4, support shafts 52A, 52B that are supported rotatably perpendicular to the web of the leg 3 and have the swinging member 51 fixed to one end thereof, a link member 53 that connects the two swinging members 51, etc.

[0022] Each wheel 4 is rotatably attached to one end of the swaying member 51 arranged at an angle. The other end of the swaying member 51 is located higher than the one end. The swaying position of the swaying member 51 is closer to vertical when the wheels 4 are moved forward than when the wheels 4 are moved forward. In other words, by bringing the position of the swaying member 51 closer to vertical, the ground contact surface of each wheel 4 can be positioned lower than the lower end 32 of the leg 3. An opening 32a is formed in the lower end 32 to allow the moving wheel 4 to pass through.

[0023] Further, the two oscillating members 51 have protruding parts at their centers that protrude in the same direction as the support shafts 52A and 52B, and both protruding parts are connected to each other by the link member 53. By virtue of this link member 53, when one of the two oscillating members 51 oscillates, the other also oscillates at the same time.

[0024] The other end side of the support shaft 52A (the side opposite to the side to which the swinging member 51 is fixed) penetrates the web of the leg 3 and protrudes into the outer region of the two regions separated by this web. A lower end part of an operating lever 54 is fixed to the other end side of the support shaft 52A. A metal pipe can be passed through a through hole formed in the web of the leg 3 and welded to the web, so that the support shafts 52A and 52B can be rotatably supported by the pipe.

[0025] 4 and 5, when the operating lever 54 is tilted about the support shaft 52A, one of the rocking members 51 rocks, and this rocking is transmitted to the other rocking member 51 by the link member 53, causing the other rocking member 51 to also rock. The operating lever 54 is located on the outer surface side of the leg 3 and is tilted along the outer surface, causing the two wheels 4 to move.

[0026] An upper portion 54a including a portion to be handled by the operating lever 54 is located above the upper portion 31 of the leg 3. The upper portion 54a of the operating lever 54 is located near the mounting base 2 when the wheels 4 are moved to the stored position, and moves away from the mounting base 2 when the wheels 4 are moved to the protruding position. A lever locking portion 35 that holds the protruding state of the wheels 4 by the operating lever 54 is provided on the outer edge of the upper portion 31 (upper flange) of the leg 3. That is, when the operating lever 54 is tilted to move the wheels 4 to the protruding position, a part of the upper portion 54a is locked by the lever locking portion 35 as shown in FIG. 6. The lever locking portion 35 has a tapered portion that gradually increases the amount of protrusion outward from the leg 3 as it moves away from the mounting base 2, and has an engagement recess 35a at a position farthest from the mounting base 2.

[0027] In addition, a damper device (assisting device) 56, for example of a high-pressure gas type, which assists the operation of the protruding movement of the wheel 4 by the operating lever 54, is disposed in the outer region of the two regions separated by the web of the leg 3. The rear end of this damper device 56 is supported so as to be able to swing by a support member 56a fixed to the web. In addition, the damper device 56 is positioned approximately horizontally through an opening 33a formed in the reinforcing plate 33 located on the central side of the web. A connecting protrusion 521 is fixed to the support shaft 52A to one end of which the one swing member 51 is fixed, and the tip of the shaft of the damper device 56 is connected to the connecting protrusion 521.

[0028] With the above configuration, when moving the movable pedestal 1, the wheels 4 can be moved downward beyond the lower end 32 of the leg 3 (the part above the wheels of the movable pedestal 1 can be lifted) to make the movable pedestal 1 movable, which eliminates the need for heavy muscle labor to drag the movable pedestal 1, reduces the amount of crane used to move the pedestal, and also makes it easier to fine-tune the position of the movable pedestal 1. The movable pedestal 1 can also be moved by holding the upper part 54a of the operating lever 54 in addition to the handle 24. On the other hand, when placing an object on the movable pedestal 1, the wheels 4 can be moved upward beyond the lower end 32 of the leg 3 (the part above the wheels of the movable pedestal 1 can be lowered) to make the movable pedestal 1 immovable, so that the object (such as a steel column) can be stably placed on it. FIG. 7 shows an example of a state in which a steel column P is placed on two movable pedestals 1.

[0029] When the multiple wheels 4 are moved by the switching devices 5 provided on each leg 3, the wheels 4 can be moved by a smaller number of switching devices 5 than the number of wheels.

[0030] When the switching device 5 is provided with an operating lever 54 that tilts along the outer surface of the leg 3 on the outer side of the leg 3, the operating lever 54 does not protrude significantly outside the leg 3 when tilted, thereby reducing the situation in which the tilting operation is hindered by equipment near the movable stand 1.

[0031] If a damper device 56 that assists the operation of moving the wheels 4 protruding by the operating lever 54 is provided, the tilting operation of the operating lever 54 (the operation of moving the part above the wheels of the movable platform 1 protruding) becomes easier. In addition, when the operating lever 54 is tilted to move the wheels 4 to a retracted position, the damper device 56 can also suppress a sudden descent of the part above the wheels of the movable platform 1.

[0032] When the upper portion 54a serving as the handle of the operating lever 54 is located above the upper portion 31 of the leg 3, the operating lever 54 becomes easier to operate. Furthermore, when the lever locking portion 35 is provided on the upper portion 31 of the leg 3, the operating lever 54 can be easily held by the lever locking portion 35 while checking the lever locking portion 35. Furthermore, when the lever locking portion 35 has the tapered portion, as shown in Fig. 6, the operating lever 54 moves to the engagement recess 35a while following the tapered portion, so that the operation of locking the operating lever 54 to the lever locking portion 35 can be smoothly performed.

[0033] When the mounting base 2 and the legs 3 are separably connected by bolts and nuts 11 or the like, it becomes possible to replace the mounting base 2 with one of a different size in accordance with a change in the size of the object to be mounted.

[0034] In the above example, the wheel 4 is moved by the operating lever 54, but this is not limiting. The switching device 5 may be configured to move the wheel 4 by a cylinder or a jack that is operated by hydraulic pressure.

[0035] Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited to the illustrated embodiment. Various modifications and variations can be made to the illustrated embodiment within the same scope as the present invention or within an equivalent scope. [Explanation of symbols]

[0036] 1: Movable stand 2: Placement table 3: Legs 4: Wheels 5: Switching device 11: Bolts and nuts 21: Load receiving part 21a: Reinforcement plate 22: Support pillar 22a: Inclined surface part 23: Contact member 24: Handle 25: Bottom part 31: Top 32: Bottom end 32a: opening 33: Reinforcement plate 33a:Aperture 35: Lever locking part 35a: Engagement recess 51: Swinging member 52A: Support shaft 52B: Support shaft 53: Link member 54: Operating lever 54a: Upper part 56: Damper device 521: Connecting protrusion P: Steel column (object to be placed)

Claims

1. the platform on which an object is placed, legs supporting the platform at an upper side and having lower ends that contact the ground, a number of wheels arranged on the lower side of the legs, and a switching device that switches between a state in which the wheels are moved downwardly beyond the lower ends of the legs to make them movable, and a state in which the wheels are moved upwardly beyond the lower ends of the legs to make them immovable, The switching device includes an operating lever that is tilted to move the wheel, A movable stand characterized in that an upper portion of the operating lever, which serves as a handle, is located above the upper portion of the leg, and a lever locking portion is provided on the upper portion of the leg to maintain the wheel in a protruding state caused by the operating lever.

2. 2. The movable stand according to claim 1, wherein said operating lever is tilted along an outer surface of said leg on the outer surface side of said leg.

3. 3. The movable stand according to claim 1 or 2, wherein each leg is provided with the switching device, and a plurality of wheels are moved by each switching device.

4. A movable stand as described in any one of claims 1 to 3, characterized in that it is provided with an assisting device that assists in the operation of the protruding movement of the wheels by the operating lever.

5. A movable stand as described in any one of claims 1 to 4, characterized in that the mounting base portion and the leg portion are separably connected.

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