JPH0738578Y2 - Lifting device for loading platform - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device for a base, for example, a multi-level parking facility or the like, which transfers a load to the upper surface.

[0002]

2. Description of the Related Art Conventionally, it is well known that an X-shaped pantograph type expansion / contraction frame is used to move a load loading base up and down, but the expansion / contraction operation of the pantograph type expansion / contraction frame is performed exclusively by a hydraulic device. In many cases, the means for using the hydraulic means also uses a means for using an electric rotary screw rod for the hydraulic type because the facility equipment is heavy and the operation, handling, maintenance and management thereof are troublesome.

[0003]

However, although the above-mentioned rotary screw rod is used as a driving device, the facility is simple and the operation is easy. However, during a long period of use, due to a large load, the operating mechanism, especially the screw rod, is There is a problem in that the threaded portion is apt to be worn, which causes a hindrance.

[0004]

DISCLOSURE OF THE INVENTION The present invention eliminates the above-mentioned inconvenience, and aims at smoothing the raising and lowering operation by the screw rod in the screw rod type lifting device and eliminating the anxiety caused by the wear of the screwed portion. The movable end of one arm, which constitutes a pair of left and right X-shaped pantograph telescopic frames supporting the load carrying base, is screwed onto a movable screw rod that is screwed onto a rotating screw rod that interlocks with a reversible drive motor on a fixed base. A wheel that rotates in contact with the raceway surface on the base, and is brought close to the moving screw piece, and a safety control screw piece is provided on the retreating side thereof. Is characterized in that it is screwed into the rotary screw.

[0005]

When the drive motor 6 is rotated in the forward direction in the device of the present invention, the moving screw piece 4 screwed into the screw rods 3 on both sides interlocking with this is moved from the position shown by the solid line in FIG. Telescopic frame 2 that moves toward the bottom and connects the lower movable end 2c to this
One arm 2a stands up from the state shown by the solid line in FIG. 1 as shown by a phantom line. Therefore, the extension of the telescopic frame 2 causes the loading base 1 connected and supported at the upper end to move upward, and the screw rod 3 reverses. The base 1 is lowered from the upper moving position by retracting the moving screw piece 4 to the original position, and the moving screw piece 4 is rotated by the rotation of the screw rod 3 in the ascending / descending operation of the wheel 8 which is integrally supported by the wheel 8. The surface of the track 9 is moved by rotation, so that the movement is smooth, the expansion and contraction of the expansion and contraction frame 2 is performed easily, and the base 1 is easily moved up and down. Since the weight of “a” is applied as a large load, the threaded portion between the threaded rod 3 and the moving threaded piece 4 is worn, and the wear causes the adverse effect of loosening the threaded engagement. On the retracted side, insert the safety control screw piece 10 in the same direction as the screw piece 4. If the safety control screw 10 is moved, the load is not directly applied to the safety control screw 10, so that the screwing portion with the screw rod 3 is less worn, and the screwing portion of the moving screwing piece 4 is loosened due to wear and tear. When the screw piece 4 moves backward due to the transfer load, the safety control screw piece 10 prevents the backward movement of the screw piece 4 so that the base 1 can be prevented from falling.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the lifting device according to the present invention will be described with reference to FIGS. The illustrated example shows a case in which the vehicle a is mounted on the base 1 and is lifted up and down, and the vehicle 5 is also housed on the base 5 on the lower surface thereof.
It can also be used as a device for moving the lifting base 1 up and down.

Reference numeral 1 denotes a base which is supported on the X-shaped pantograph type expansion and contraction frames 2 and 2 on the left and right sides, and the expansion and contraction of the expansion and contraction frame 2 causes the base 1 to move up and down.

The telescopic frame 2 is constructed by intersecting two arms 2a and 2b in an X-shape and pivotally attached at the intersection, and the lower end 2c of one arm 2a is a moving screw screwed into a screw rod 3 described later. Piece 4
The lower end 2d of the other arm 2b is pivotally attached to a fixed position of the fixed base 5, the upper end 2e of one arm 2a is pivotally attached to the lower surface of the base 1, and the upper end 2f of the other arm 2b is The base 1 is connected so as to be movable in the front-rear direction along the lower surface thereof, and thus the movable end 2c of one arm 2a is horizontally moved back and forth to expand and contract the extendable frame 2 so that the base 1 is in a substantially horizontal state. Move up and down with.

A screw rod 3 having a predetermined length is horizontally installed on both sides of the upper surface of the base 5, and is interlocked with a drive motor 6 capable of switching between forward and reverse directions. The screw rods 3 on both sides are chained as shown in FIG. Rotate at the same speed at the same time through the mechanism 7, and the both side screw rods 3
As described above, the moving screw piece 4 was screwed into each of them, and the one arm 2a lower end 2c of the expandable frame 2 was connected thereto. Therefore, when the screw piece 4 is moved by the rotation of the screw rod 3, one arm 2a cooperates with the other arm 2b to tilt up and down together, and the expansion and contraction of the telescopic frame 2 due to the tilting. Raise and lower the base 1.

The weight of the load a on the base 1 is loaded on the screw piece 4, and a large load is applied to a member around the screwing portion between the screw rod 3 and the screw piece 4, but the screw piece 4 has a large load. Since the wheel 8 is attached and the wheel 8 is rotatably moved in contact with the track 9 on the upper surface of the base 5, the movement is smooth, so that the expansion and contraction operation of the expansion and contraction frame 2 by the screw rod 3 is smoothly performed.

Further, when the screwing portion between the screw rod 3 and the screw piece 4 is heavily loaded, the screwing portion is worn, and particularly when the spiral of the screw piece 4 is worn out and screwing becomes impossible, loading is carried out. A load acts to cause the screw piece 4 to freely move in the backward movement direction, but in order to prevent this obstacle, a safety control screw that does not receive the above-mentioned load close to the backward movement side of the screw piece 4 is provided. Since the piece 10 is screwed so as to be moved by the rotation of the screw rod 3 together with the moving screw piece 4, the retreat movement of the screw piece 4 on the retreat side of the screw piece 4 in the above-mentioned abrasion is performed by the safety control screw piece 10. The support system was stopped to prevent danger.

In the figure, reference numeral 11 denotes a receiving member that supports the lower surface of the tip of the base 1 when the base 1 is lowered, and S ₁ and S ₂ detect the forward and backward movement positions of the screw piece 4 due to the rotation of the screw rod 3. A limit switch for automatically stopping the driving of the motor 6 and limiting the ascending / descending position of the base 1 is shown.

[0013]

According to the present invention, since the X-shaped pantograph type telescopic frame supporting the loading base uses the rotation of the screw rod instead of the conventional hydraulic means, the equipment cost is low. In order to simplify the operation and handling, and to attach the wheel to the screw piece that moves by the rotation of the screw rod so as to rotate along the raceway surface, the movement of the screw piece that receives the load, and therefore the basic Since the lifting operation of the platform is made smooth and smooth, and the safety control screw that does not receive the loading load directly near the moving screw is inserted into the screw rod and moved together with the moving screw, the loading load is received. When the spiral of the moving screw piece is worn out, the dangerous backward movement of the screw piece is stopped by the safety control screw piece, and the base is prevented from falling.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a loading base lifting device according to the present invention.

FIG. 2 is a plan view with a part removed.

[Fig. 3] Partial enlarged side view

4 is a sectional view taken along line IV-IV of FIG.

5 is a sectional view taken along line VV of FIG.

[Explanation of symbols] 1 base 2 telescopic frames 2a, 2b arm 3 screw rod 4 moving screw piece 5 base 8 wheel 9 track 10 safety control screw piece

Claims (1)

[Scope of utility model registration request] 1. A rotary screw rod in which a movable end of one arm constituting a pair of left and right X-shaped pantograph type telescopic frames, which support a load loading base on an upper part thereof, is interlocked with a reversible drive motor on a fixed base. It is connected to a moving screw piece that is screwed into the shaft, and a wheel that rotates in contact with the raceway surface on the base is pivotally supported on the moving screw piece. A load transfer base elevating device that is formed by screwing a control screw piece into a rotating screw rod.