JP3736890B2 - Floor lifting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a floor lifting device suitable for a floor lifting device that drives a lifting floor in a theater or the like, particularly for a short lifting stroke.
[0002]
[Prior art]
In a theater or the like, there is a case where a floor elevating device that can displace the elevating floor in the vertical direction is used.
[0003]
As such a floor lifting device, for example, a scissors type floor lifting device has been proposed in Japanese Patent Publication No. 2-24458 by the present applicant. And conventionally, such a scissors type floor raising / lowering apparatus is used also for the raising / lowering floor with a comparatively short raising / lowering stroke.
[0004]
[Problems to be solved by the invention]
By the way, such a scissor-type lifting floor device is relatively expensive because of its complicated structure, and it can be said that it is suitable for application to a relatively small floor lifting device having a short lifting stroke. Absent.
[0005]
On the other hand, if such a lifting floor with a short lifting stroke is moved up and down with a commercially available jack, shaking at the upper limit position of the lifting floor becomes a problem, and secondary parts such as a guide pipe are necessary. turn into.
[0006]
The present invention pays attention to such problems, and provides a floor lifting device that is particularly suitable for a lifting floor with a short lifting stroke, is simple in structure and can be manufactured at low cost, and can appropriately prevent shaking of the lifting floor. The purpose is to do.
[0007]
[Means for Solving the Problems]
A floor lifting device according to the present invention includes a floor frame, a plurality of large-diameter screw jacks having a short lifting stroke supporting the floor frame from below, a single motor for driving these screw jacks, Transmission means for synchronously transmitting the rotation of the single motor to each screw jack, and the screw jack is supported by the outer cylinder so that the inner cylinder can be rotated via a bearing, and the inner circumference of the inner cylinder A cylindrical nut formed with a thread groove on the side is fixed, a screw pipe with a screw formed on the outer periphery is screwed onto the nut, and the screw pipe expands and contracts vertically when the inner cylinder rotates. The transmission means is the same as the rotating shaft corresponding to the driven sprocket provided on the inner cylinder of each screw jack and the number of the screw jack corresponding to each driven sprocket on the motor side. A drive sprocket of the same shape provided in overlying, characterized in that it is composed of a chain that connects the drive sprocket and the driven sprocket.
[0009]
[Action]
In the present invention, the floor frame is supported by a plurality of screw jacks themselves and is driven by a single motor. Each screw jack has the same shape, and the rotation of the motor is transmitted to each screw jack by a transmission means. Because it is transmitted equally, the screw jacks expand and contract synchronously, and the height of each part of the floor frame supported by each screw jack is kept the same, so the floor frame does not tilt or shake, Ascend and descend stably while maintaining level. Further, the structure of the floor lifting device is simplified and parts for preventing shaking are not required, so that the lifting device can be manufactured at low cost. Furthermore, the rotation of each drive side sprocket on the motor side is transmitted to each driven side sprocket on each screw jack side via the chain, but this is transmitted because the rotation of each coaxial drive side sprocket is the same. Since the chain circulation is the same and each driven sprocket is the same, each screw jack rotates synchronously and the height of each part of the floor frame supported by each screw jack is the same Therefore, the floor frame can be moved up and down stably while maintaining the level without tilting or shaking.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0012]
As shown in FIG. 1, the floor lifting device of the present invention includes a plurality of (two in FIG. 1) thick screw jacks 2 each having a rectangular floor frame 1 that is a lifting floor fixed on a base 2. It is configured with horizontal support. Thus, in the present invention, the floor frame 1 is directly supported by the screw jack 2.
[0013]
Each screw jack 2 has the same configuration, and as shown in FIG. 2, a screw pipe 5 is slidably housed inside a cylindrical base frame 4. The lower end side of the base frame 4 is an annular flange portion 6, and the base frame 4 is fixed on the base 2 through the flange portion 6.
[0014]
On the other hand, an outer cylinder 7 having the same diameter as the base frame 4 is fixed to the upper end portion of the base frame 4, and an inner cylinder 8 is provided inside the outer cylinder 7. An outer rail (not shown) is provided on the inner peripheral side of the outer cylinder 7 and an inner rail (not shown) is provided on the outer periphery of the inner cylinder 8, and a plurality of balls 9 are interposed between the outer rail and the inner rail. By mounting, a bearing is formed. Thereby, the inner cylinder 8 is rotatable with respect to the outer cylinder 7 and the base frame 4.
[0015]
A cylindrical nut 11 having a spiral thread groove 12 formed on the inner periphery is fixed to the inner periphery of the inner tube 8. The nut 11 is screwed into a screw 13 formed on the outer periphery of the cylindrical screw pipe 5, and the nut 12 is interposed between the base frame 4 and the outer cylinder 7 that are stationary against rotation and the screw pipe 5. As the inner cylinder 8 rotates, the screw pipe 5 expands and contracts in the vertical direction according to the rotation direction of the nut 12.
[0016]
In order to drive the rotation of the nut 12 and the inner cylinder 8, the inner cylinder 8 is integrated with a driven sprocket 15, and the driven sprocket 15 is connected to the driving sprocket 17 via a chain 16. ing. Since the drive-side sprocket 17 is rotationally driven by the geared motor 18, the nut 12 rotates in both forward and reverse directions according to the rotation or reverse rotation of the geared motor 18, and the screw pipe 5 extends or contracts.
[0017]
At this time, a plurality of screw jacks 3 support the floor frame 1, but there is only one geared motor 14, and a chain 16 extending from each screw jack 3 is connected to a sprocket 17 of one geared motor 14. It is like that. For this reason, the screw pipe 5 of each screw jack 3 expands and contracts synchronously in the extending or contracting direction as one geared motor 14 rotates.
[0018]
The drive sprockets 17 on the geared motor 14 side are provided with the same diameter as the number of the screw jacks 3, and each of these drive side sprockets 17 coaxially overlapped with the rotating shaft of the geared motor 14 is provided. It is designed to rotate the same.
[0019]
At this time, each driven sprocket 15 on each screw jack 3 side is supported in the shape of the inner cylinder 8 so as to have the same height as the corresponding drive side sprocket 17.
[0020]
Next, the operation will be described.
[0021]
When the floor frame 1 is moved up and down, the geared motor 14 is rotated in the forward direction or the reverse direction according to the rising or lowering of the floor frame 1.
[0022]
The rotation of the geared motor 14 is transmitted to each screw jack 3 by the chain 16, but there is only one geared motor 14, and each screw jack 3 is the same, and the same floor frame 1 is different from each other. Since the screw pipes 5 of the screw jacks 3 are coupled to prevent rotation, the expansion and contraction of the screw pipes 5 of the screw jacks 3 is performed synchronously, and the height of each part of the floor frame 1 supported by the screw jacks 5 is Since they are kept the same, the floor frame 1 can be moved up and down stably while maintaining the level without tilting or shaking.
[0023]
Further, the floor frame 1 is supported by a plurality of large-diameter screw jacks 3 and these are expanded and contracted completely in synchronization, so that they do not sway, and secondary parts such as guide pipes are provided to prevent swaying. There is no need for a new structure, and the structure is simple. In particular, it is possible to manufacture a small-scale lifting floor device with a short lifting stroke at a low cost.
[0024]
【The invention's effect】
According to the present invention , the floor frame is supported by a plurality of screw jacks themselves and is driven by a single motor. Each screw jack has the same shape, and the rotation of the motor is transmitted to each screw by the transmission means. Because the screw jacks are transmitted equally to the jacks, the screw jacks will expand and contract synchronously, and the height of each part of the floor frame supported by each screw jack will remain the same, so the floor frame will tilt and swing Without going up and down, it moves up and down stably. In addition, the structure of the floor lifting device is simplified and parts for preventing shaking are not required, so that the floor lifting device can be manufactured at low cost. Furthermore, the rotation of each drive side sprocket on the motor side is transmitted to each driven side sprocket on each screw jack side via the chain, but this is transmitted because the rotation of each coaxial drive side sprocket is the same. Since the chain circulation is the same and each driven sprocket is the same, each screw jack rotates synchronously and the height of each part of the floor frame supported by each screw jack is the same Therefore, the floor frame can be moved up and down stably while maintaining the level without tilting or shaking.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
FIG. 2 is a perspective view of the same.
[Explanation of symbols]
1 Floor frame 3 Screw jack 14 Geared motor 15 Driven side sprocket 16 Chain 17 Drive side sprocket

Claims (1)

A floor frame, a plurality of large-diameter screw jacks with a short lifting stroke that support the floor frame from below, a single motor that drives these screw jacks, and the rotation of this single motor. A transmission means for synchronously transmitting to a screw jack, and the screw jack is a cylindrical shape in which an inner cylinder is rotatably supported by an outer cylinder via a bearing, and a screw groove is formed on an inner peripheral side of the inner cylinder The nut is fixed, screwed into the nut with a screw pipe formed on the outer periphery, and the inner pipe rotates, the screw pipe is configured to expand and contract in the vertical direction,
The transmission means is provided on a driven side sprocket provided in the inner cylinder of each screw jack, and on the motor side corresponding to each driven side sprocket, and is provided on the same axis as the number of the screw jacks. A floor elevating apparatus comprising a drive sprocket having the same shape and a chain connecting the driven sprocket and the drive sprocket.

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