JP2736632B2 - Stage lifting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stage elevating device installed in a theater or a hall.

[0002]

2. Description of the Related Art In a theater or a hall, a stage used as a stage of a show such as an entertainment show or a fashion show can be moved up and down for show-up. Conventionally, as a lifting device of this type of stage, X
A pantograph system having legs is often used (for example, Japanese Utility Model Laid-Open No. 3-5855).

[0003]

However, the conventional pantograph system has a mechanism for raising the stage by opening the X-leg, so that the height of the stage is particularly limited due to the limit of the length of the X-leg. It was not possible to make the height too high, and generally the height limit was about 2 to 3 m.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a stage elevating device which can raise a stage high and has a simple structure.

[0005]

To this end, the present invention provides a pair of left and right sprockets 3A,
3B, a drive unit 13 for rotating the sprockets 3A, 3B, a pair of left and right chains 4A, 4B running vertically along the sprockets 3A, 3B,
When a plurality of chains 4A and 4B are mounted in a row in contact with the opposing surfaces of the chains 4A and 4B and run in the vertical direction, blocks 8A and 8B whose outer surfaces are in contact with each other, and vertical running portions of the chains 4A and 4B A stage elevating device was constituted by the stage 1 coupled to the upper end of the stage.

[0006]

In the above construction, the load of the stage 1 is supported by the vertically arranged blocks 8A and 8B. When the driving unit 13 is driven to rotate the sprockets 3A and 3B, the chains 4A and 4B are moved vertically. It can travel and raise and lower the stage 1 coupled to its upper end.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a stage elevating device, FIG. 2 is a partially enlarged front view of the same, FIG. 3 is a plan view of the same, FIG. It is a perspective view.

In FIGS. 1 and 2, reference numeral 1 denotes a stage, and the stage 1 is moved up and down by a lifting mechanism described below. T is the floor of the stage. Reference numeral 2 denotes a lower frame, and a pair of left and right sprockets 3A and 3B are rotatably supported in the center of the lower frame so as to be close to each other. As shown in FIG. 3, two sets of sprockets 3A and 3B are provided on both sides of the center of the lower frame 2. Chains 4A and 4B are tuned to the sprockets 3A and 3B. As shown in FIG. 1, sprockets 5A, 5B
Are supported, and rollers 6A and 6B are arranged above the sprockets 5A and 5B. Chain 4A,
4B is a sprocket 3A, 3B, 5A, 5B, a roller 6
A, 6B around the chain, at the tip of the chain 4A,
Tension weights 7A and 7B for applying tension to 4B are attached. FIG. 3 is a simplified illustration.

A plurality of dice-shaped blocks 8A are attached to one chain 4A in a row in contact with each other. Similarly, a large number of blocks 8B are attached to the other chain 4B. The blocks 8A and 8B are made of steel, and each side has a length of about 4 cm, for example. The chains 4A and 4B run vertically around the sprockets 3A and 3B. As shown in FIG. 2, in the vertical running section, the vertical chains attached to the opposing surfaces of one chain 4A and the other chain 4B. The outer surfaces of the rows of blocks 8A and 8B abut each other. Block 8A and Block 8
B is shifted by a quarter pitch P (see FIG. 6), and the reason will be described later with reference to FIGS.

As shown in FIG. 4, one block 8A has a projection 9A and the other block 8B has a groove 9B. As shown in FIG. 2, when traveling in the vertical direction, the projection 9A fits into the groove 9B, which causes the blocks 8A and 8B to be displaced from each other in the lateral direction (the direction of arrow N in FIG. 4). To prevent

In FIG. 2, a plurality of support members 11 are provided below the sprockets 3A and 3B in the circumferential direction. These support members 11 support the sprockets 3A, 3A.
Blocks 8A and 8B that rotate along B are supported from below. In FIG. 5, the support member 11 is configured by fitting a large number of balls 11b on the peripheral surface of a roller 11a, and the blocks 8A and 8B slide on the ball 11b. According to the support member 11 having such a structure, the blocks 8A and 8B that contact the support member 11 located at the apex in FIG. 3 can freely rotate counterclockwise and clockwise, respectively. A plurality of receiving rollers 12 are disposed on the lower frame 2. The receiving roller 12 supports the blocks 8A and 8B running on the lower frame 2 in the horizontal direction from below.

In FIG. 3, a motor 13 is provided at the center of the lower frame 2. The rotation of the motor 13 is transmitted to the sprockets 3A and 3B via a transmission system such as gears 14, 15 and a shaft 16. That is, the motor 13,
The gears 14, 15 and the like serve as driving units for the sprockets 3A, 3B.

In FIG. 2, a base plate 16 is connected to chains 4A and 4B by bolts and nuts 17. A top 18 is arranged on the uppermost blocks 8A and 8B, and the top 18 and the base plate 16 are connected by bolts and nuts 19. The stage 1 is mounted on the base plate 16 via a frame 20. In FIGS. 1 and 3, pinions 21 are provided at four corners of the stage 1. At four corners of the lower frame 2, racks 22 with which pinions 21 are engaged are vertically provided. Pinion 21 is rack 2
Rolls up and down along 2 to guide the stage 1 up and down.

The lifting device of this stage has the above-mentioned structure, and drives the motor 13 to drive the sprockets 3A,
3B, the chain 4 in FIGS.
A and 4B run vertically between the sprocket 3A and the sprocket 3B to move the stage 1 up and down. The load of the stage 1 is transmitted to the blocks 8A and 8B arranged in a line in the vertical direction in FIG. 2, and is supported by the sprockets 3A and 3B and the support member 11 with which the chains 4A and 4B engage.

According to this lifting mechanism, the chains 4A, 4B
The height of the stage 1 can be set large (for example, 5 m or more) by increasing the height of the stage 1 in the vertical direction. The racks 22 erected at the four corners of the lower frame 2 are hidden under the stage so that the audience cannot see them. In this embodiment, the sprocket 3
A, 3B and chains 4A, 4B are installed in two sets as shown in FIG. 3, but four sets may be provided to support the four corners of the stage 1, and depending on the size of the stage, They may be provided in pairs.

Next, the reason why the left and right blocks 8A and 8B are shifted by a quarter pitch P will be described with reference to FIGS. As shown in FIG. 6, chains 4A and 4B
, One block 8A, 8B is attached to one element. Also, as shown in FIG.
A and 3B have a blade portion 3 ', while sprockets 3A and 3B
When B rotates by an angle θ of two blades, the chains 4A and 4B run by one pitch (that is, the length of the blocks 8A and 8B) P.

Chains 4A and 4B are sprockets 3A and 3
When engaging with the blade portion 3 'of B, the outer side (A
Direction), and when it is located in the valley between the blade portion 3 ′ and the blade portion 3 ′, a force acts to return in the opposite direction B. Here, if the above-mentioned quarter pitch P is not shifted, the left block 8A and the right block 8B
Means that the forces in the directions of arrows A and B act simultaneously. When the force in the direction of arrow A acts, the blocks 8A and 8B collide with each other, and when the force in the direction of arrow B acts, they move away from each other. I do. When the block 8A and the block 8B repeatedly collide with and separate from each other, a collision sound may be generated.

Therefore, the sprocket 3A and the sprocket 3
By shifting the rotation angle of B and shifting the left block 8A and the right block 8B by a quarter pitch P as shown in FIG. 6, when a force in the direction A acts on the left block 8A, When a force in the B direction acts on the right block 8B and a force in the B direction acts on the left block 8A, a force in the A direction acts on the right block 8B. That is, the left block 8A and the right block 8B run in the vertical direction while receiving forces in the same direction, thereby escaping the forces received from each other and repeating the collision / separation as if by the arrow M. It can run in the vertical direction smoothly, meandering in the direction.

[0019]

According to the present invention, the elevation height of the stage 1 can be set large. In addition, the structure is simple and its own weight is small, so there are few restrictions on places and it can be easily installed in various theaters and halls. In addition, the above-mentioned existing pantograph-type facility can be additionally installed as a reinforcement elevating device. That is, in recent years, performers and spectators have tended to perform intense activities on the stage for the show-up, and thus the existing stage has become insufficient in strength and collapse accidents have occurred. Therefore, the existing facility can be reinforced by additionally configuring the elevating device of the present invention in the existing facility. In this case, the lifting device according to the present invention is configured to vertically move the chains 4A, 4B to which the blocks 8A, 8B are attached, so that the stage 1 is moved up and down. Therefore, the design layout is relatively free.
Therefore, it can be easily added to existing facilities.

[Brief description of the drawings]

FIG. 1 is a front view of a stage elevating device.

FIG. 2 is a partially enlarged front view of a stage elevating device.

FIG. 3 is a plan view of a stage elevating device.

FIG. 4 is a sectional view of a block of a stage elevating device.

FIG. 5 is a perspective view of a support member of the stage elevating device.

FIG. 6 is a front view of a chain and a block of a stage elevating device.

FIG. 7 is a partial front view of a sprocket of the stage elevating device.

[Explanation of symbols]

 Reference Signs List 1 Stage 3A, 3B Sprocket 4A, 4B Chain 7A, 7B Balance weight 9A Projection 9B Groove 11 Support member 12 Receiving roller 13 Motor (drive unit)

Claims (1)

(57) [Claims] 1. A pair of left and right sprockets 3A and 3B which are opposed to each other and are adjacent to each other.
A drive unit 13 for rotating the sprocket 3B, a pair of left and right chains 4A and 4B running vertically along the sprockets 3A and 3B, and a large number of the chains 4A and 4B mounted in a row in contact with the opposing surfaces of the chains 4A and 4B. Blocks 8A, whose outer surfaces abut each other when running in the vertical direction
8B and a stage 1 coupled to the upper end of the vertical running portion of the chains 4A, 4B.