JP3163429B2 - Elevator fall prevention 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 fall prevention device for an elevator such as a stacker crane used in an automatic warehouse.

[0002]

2. Description of the Related Art An elevator, for example, a stacker crane, allows a carrier to move up and down along a guide column, connects a lift chain that is wound and fed by a winch or the like to the carrier, and winds and unwinds the lift chain. The platform is moved up and down along the guide columns. Such a lift is provided with a fall prevention device because the carrier is dropped by its own weight when the lift chain is cut, which is dangerous.

In this fall prevention device, a fall prevention rail is provided along a guide column, and a stopper for holding the fall prevention rail is attached to the carrier. In normal times, the stopper is separated from the fall prevention rail and the carrier is moved. It is known that the lifting platform can be moved up and down, and when a lift chain is cut, a stopper sandwiches a rail for exclusive use of a fall prevention to prevent the loading platform from falling.

[0004]

In such a fall prevention device, a rigid and heavy heavy fall prevention rail is attached to the guide post, so that the weight of the entire elevator becomes heavy and the lift chain is cut off. The stopper prevents the fall of the carrier by holding the rigid rigid fall prevention rail after the carrier slightly falls, so that the carrier that started dropping is suddenly stopped and a large shock occurs.

Accordingly, an object of the present invention is to provide a fall prevention device for an elevator which can solve the above-mentioned problems.

[0006]

A lift chain 3 is connected to a carrier 2 which can move up and down along a guide column 1, and the lift chain 3 is wound up and fed out.
In the device for preventing the loading platform 2 from falling in an elevator, a flexible wire rope 4 is disposed along the guide column 1, and the loading platform 2 is provided with a cam 24 and a support piece 31 on both sides of the wire rope 4. And the cam 24 is rotatably attached to a first position in which the cam 24 is separated from the wire rope 4 and a second position in which the wire rope 4 is pressed against the support piece 31.
The cam 24 is rotationally biased and held in a second position by a spring 29, and the shaft 15 is supported on the carrier 2 so as to be vertically movable. The upper end of the shaft 15 is connected to the lift chain 3, and the lower end is connected to the lower end. Normally, the shaft 15 is in the upper position, and the cam 24 is moved by the lever 16.
Is held in the first position separated from the wire rope 4 against the spring 29, and when the lift chain 3 is cut, the shaft 15 is moved downward by the compression spring 19 and the lever 1 is moved.
6 is a fall prevention device for an elevator in which the cam 6 is separated from the cam 24 and the cam 24 rotates to the second posture.

[0007]

[Operation] Since the wire rope 4 is sandwiched between the cam 24 and the support piece 31 to prevent the carrier 2 from dropping, it is sufficient to provide a lightweight wire rope 4 to reduce the weight of the entire elevator. Loading bed 2 by elongation of rope 4
The shock when stopping can be reduced.

[0008]

[Embodiment] As shown in FIG.
The lift chain 3 is supported so that the loading platform 2 can move up and down along the axis, and is wound and fed by a winch or the like (not shown).
Is connected to a carrier 2 to constitute an elevator, for example, a stacker crane. A flexible wire rope 4 is continuously arranged on a guide column 1 in the vertical direction.

The loading platform 2 has vertical members 6 and 6 attached to both sides of a horizontal member 5 on which a load is to be placed, and a guide roller 7 in contact with the guide column 1 is attached to the vertical member 6 so that the loading platform 2 is mounted on the guide column. 1, the wire rope 4 is inserted through the vertical member 6.

As shown in FIG. 2, the vertical member 6 has a vertical plate 9 attached to a lower horizontal frame 8, an upper horizontal plate 10 attached to the upper end of the vertical plate 9, and a vertical plate 11 attached to a vertical edge. The wire rope 4 is inserted through the hole 12 of the upper horizontal plate 10 and the hole 13 of the lower horizontal frame 8.

A shaft 15 is provided in the hole 14 of the upper horizontal plate 10.
The lift chain 3 is connected to an upper end of the shaft 15, and a longitudinally intermediate portion of a lever 16 is connected to a lower end of the shaft 15 by a pin 17.
Of the upper horizontal plate 10 is in contact with the lower surface 10a of the upper horizontal plate 10, and a compression spring 19 is provided between the intermediate flange 15a and the plate 18. The plate 18 is connected to a nut 20 screwed near the lower end of the shaft 15. A spacer 21 is provided between the plate 18 and the lower surface 10 a of the upper horizontal plate 10 to support the lifting force of the lift chain 3.

One end of the lever 16 in the longitudinal direction is the vertical plate 1
The lower end of the stopper piece 22 attached to 1 is in contact with the lower end of the stopper piece 22, and the other end is provided with a projecting piece 23, which is in contact with the cam 24. The cam 24 is rotatably supported on the vertical plate 9 by a pin 25, and an arm 26,
A contact portion 27 and a wire rope pressing portion 28 are sequentially formed in the rotation direction, a spring 29 is provided over the arm portion 26 and the vertical plate 9, and the cam 24 is in the first position shown by a solid line in FIG. Abutment portion 27 and projection 2 of lever 16
3, the wire rope pressing portion 26 is separated from the wire rope 4, and the first posture is detected by the sensor 30. A support piece 31 is attached to the vertical plate 9, and the support piece 31 has an arc-shaped support recess 32.
Are formed facing the wire rope 4.

Next, the operation will be described. Normally lever 1
6 is in a substantially horizontal position shown by the solid line in FIG.
Can lift and lower the loading platform 2 smoothly. When the lift chain 3 is cut, the shaft 15 is
To move the lever 16 downward with the stopper 22 as a fulcrum in a downward position shown by a two-dot chain line in FIG. As a result, the protruding piece 23 is separated from the contact portion 27 of the cam 24, and the cam 24 rotates counterclockwise by the tension of the spring 29 to be in the second posture shown by the one-dot chain line in FIG. The wire rope 4 is pressed against the wire rope 4 and the wire rope pressing portion 28 of the cam 24 and the support piece 31 are pressed.
To prevent the carrier 2 from dropping. After this, the cam 24 further rotates counterclockwise due to a slight drop due to the weight of the loading platform 2, and assumes a third position shown by a two-dot chain line in FIG. The load 2 is reliably prevented from falling by biting. As described above, when the cam 24 rotates to the second position, the sensor 30 is turned off to sense that the fall prevention device has been operated, and the power source of the elevator is stopped to prevent a secondary disaster.

[0014]

The wire rope 4 is connected to the cam 24 and the support piece 31.
To prevent the carrier 2 from dropping, it is sufficient to provide a lightweight wire rope 4 so that the weight of the entire elevator can be reduced.
The shock when stopping can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a stacker crane.

FIG. 2 is a partially cutaway front view of the fall prevention device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Guide pillar, 2 ... Carrier, 3 ... Lift chain, 4 ... Wire rope, 15 ... Shaft, 16 ... Lever, 19 ... Compression spring, 24 ... Cam, 29 ... Spring, 31 ...
Supporting piece.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-50-21441 (JP, A) JP-A-63-160911 (JP, A) JP-A 1-137905 (JP, U) JP-A 57- 141985 (JP, U) Shokai Sho 51-47146 (JP, U) Japanese Patent Publication No. 55-306 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65G 1/00-1 / 20 B66B 5/24 B66F 9/07 B66F 17/00

Claims (1)

(57) [Claims] A lift chain (3) is connected to a carrier (2) that can move up and down along a guide post (1).
A device for preventing the carrier 2 from dropping in an elevator that raises and lowers the carrier 2 by winding and unwinding the wire rod 4. A wire rope 4 having flexibility along the guide column 1.
A cam 24 and a support piece 31 are located on both sides of the wire rope 4 on the carrier 2 and the cam 24 is
A first position separated from the wire rope 4 and the wire rope 4 as a support piece.
31 is rotatably mounted in a second position for pressing against the cam 31, and the cam 24 is rotationally biased to a second position by a spring 29.
The shaft 15 is supported on the carrier 2 so as to be vertically movable.
Connect the upper end of the shaft 15 to the lift chain 3
The lever 16 is connected to the end, and the shaft 15 is normally
The cam 24 is split by the lever 16 in the upper position.
1st posture separated from wire rope 4 against ring 29
And when the lift chain 3 is cut, the shaft 15
The lever 16 is moved downward by the compression spring 19 and
24 so that the cam 24 rotates to the second position.
Elevator fall prevention device.