JP2588947Y2 - 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, is configured such that a loading platform can be moved up and down along guide rails, a lift chain that is wound and fed by a winch or the like is connected to the loading platform, and the lift chain is wound and fed. To lift the loading platform along the guide rail.
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 rail, 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]

With such a fall prevention device, a rigid and heavy fall prevention rail is attached to the guide rail, so that the entire elevator becomes heavy and the number of parts increases. Not only will it be large,
The cost is high.

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

[0006]

In the elevator in which the carrier 2 is vertically movable along the guide rail 1 and a lift chain 3 is connected to the carrier 2, a pair of support pieces 14 are attached to the carrier 2 by the guide rail 1. A pair of wedge-shaped spaces 19 which are mounted opposite to both end surfaces to form a pair of wedge-shaped spaces A therebetween, and are supported on the carrier 2 so as to be vertically swingable.
The first and second levers 16 and 17 are connected to one end of the first and second levers 16 and 17, respectively. Rollers 18 provided on the first and second levers 16 and 17 face the pair of spaces A, respectively, and the link 19 is moved in one direction. The pair of rollers 18 move to the lower part where the space between the space parts A is large when swinging, and the pair of rollers 18 move to the upper part where the space between the space parts A is small when the link 19 swings in the other direction. When the shaft 7 moves upward, the link 19 swings in one direction, so that the link 19 swings in one direction.
Is moved downward to link the link 19 so as to swing in the other direction, the shaft 7 is moved downward by a spring, and the shaft 7 is linked to the lift chain 3 to move the shaft 7 against the spring. A fall prevention device for an elevator, comprising a switch for detecting the disconnection of the lift chain 3 which is moved upward and is turned on when the shaft 7 moves downward.

[0007]

[Operation] At normal times, when the lift chain 3 is not cut, the shaft 7 moves upward, the link 19 swings in one direction, the pair of rollers 18 move to the lower part where the space A is large, and the loading platform 2 It can move up and down along the guide rail 1. When the lift chain 3 is cut, the shaft 7 moves downward by the spring, the link 19 swings in the other direction, and the pair of rollers 18 moves to the upper portion where the space A is small, and the support piece 14 and the guide rail 1 to prevent the carrier 2 from dropping. Because of this, the fall of the carrier 2 can be prevented by using the guide rail 1 that guides the carrier 2 up and down, so that the number of parts is small, the cost is low, and the compact and lightweight can be achieved. Further, the cutting of the lift chain 3 causes the shaft 7 to move downward, whereby the link 19 swings in the other direction and the roller 18 moves above the space A to prevent the loading platform 2 from dropping. When the chain 3 is cut, the roller 1
Since the 8 moves upward, the fall of the carrier 2 can be reliably prevented when the lift chain 3 is cut without malfunction. When the lift chain 3 is cut, the switch is turned on.
N: When the switch is turned on, the disconnection of the lift chain 3 can be sensed, and when the switch is turned on, the power source of the stacker crane can be stopped to prevent a secondary disaster.

[0008]

[Embodiment] As shown in FIG. 1, a loading platform 2 can be moved up and down along a pair of guide rails 1 and 1.
The lift chain 3 is connected to the
Is wound up by a not-shown winch or the like, is fed out, and raises and lowers the loading platform 2 to constitute an elevator, for example, a stacker crane.

As shown in FIGS. 2 and 3, a pair of main rollers 4, 4 in contact with the guide rail 1 are provided at both ends of the carrier 2.
Are respectively provided, and the loading platform 2 includes a pair of main rollers 4 and 4
And moves up and down along the guide rail 1 via. Attachment horizontal plates 5 are fixed to both sides of the loading platform 2, respectively. A shaft 7 is supported by holes 6 of the attachment horizontal plate 5 so as to be movable vertically and not to rotate, and a housing 8 is provided at an upper end of the shaft 7. A sprocket 9 is rotatably supported on a housing 8 of the housing. The lift chain 3 is wound around the sprocket 9. A receiving plate 10 is attached to a lower end of the shaft 7 with a nut 11, and the receiving plate 10 A compression spring 12 is provided between the lower surface 10 and the lower surface of the mounting horizontal plate 5 to urge the shaft 7 downward. The plate 10 is in contact with the lower surface of the mounting horizontal plate 5 via the spacer 13.

A bracket 15 having a pair of support pieces 14, 14 is attached to the carrier 2 so that the pair of support pieces 14, 14 are located on both sides of the guide rail 1, and the pair of support pieces 14, 14 is provided. Are inclined in the left-right direction with respect to the vertical to form a U-shape, and form wedge-shaped spaces A with both side surfaces of the guide rail 1 respectively. Second levers 16 and 17 are provided, and rollers 18 provided at lower end portions of the first and second levers 16 and 17 via spacers 16a and 17a are located in the pair of space portions A, respectively. First and second lever 1
The upper end of each of the links 6 and 17 is connected to one end of a link 19 by a pin 20, the middle of the link 19 is supported on the carrier 2 by a pin 21 so as to be vertically swingable, and the other end is bifurcated. The shaft 7 is connected to the lower end of the shaft 7 by a pin 22.

Next, the operation will be described. Normally, the shaft 7 is in the upper position, the link 19 swings to the lower right as shown by the solid line in FIG. 2, and the roller 18 is located at the lower part where the interval in the space A is large and does not contact the guide rail 1. Therefore, the bed 2 moves up and down smoothly.

When the lift chain 3 is cut, the shaft 7
Is moved downward by the compression spring 12 and swings the link 19 to the upper right as shown by the imaginary line in FIG. 2, so that the roller 18 moves to the upper part where the space A is small and the support piece 14 and the guide rail 1 are moved. To prevent the carrier 2 from falling,
In this state, if the bed 2 slightly falls due to its own weight, the roller 18 bites between the support piece 14 and the guide rail 1 to prevent the bed 2 from dropping. At this time, one end of the link 19 turns on the limit switch 23, thereby detecting the disconnection of the lift chain 3 and stopping the power source of the stacker crane to prevent a secondary disaster.

[0013]

Normally, when the lift chain 3 is not cut, the shaft 7 moves upward, the link 19 swings in one direction, and the pair of rollers 18 moves to the lower part where the space A is larger. Can move up and down along the guide rail 1. When the lift chain 3 is cut, the shaft 7 moves downward by the spring, the link 19 swings in the other direction, and the pair of rollers 18 moves to the upper portion where the space A is small. Bite between 1 and
Prevents the bed 2 from falling. Because it looks like this,
The fall of the carrier 2 can be prevented by using the guide rail 1 that guides the ascending and descending, so that the number of parts is small, the cost is reduced, and the compact and lightweight can be achieved. Further, the cutting of the lift chain 3 causes the shaft 7 to move downward, whereby the link 19 swings in the other direction and the roller 18 moves above the space A to prevent the loading platform 2 from dropping. When the chain 3 is cut, the roller 1
Since the 8 moves upward, the fall of the carrier 2 can be reliably prevented when the lift chain 3 is cut without malfunction. When the lift chain 3 is cut, the switch is turned on.
N: When the switch is turned on, the disconnection of the lift chain 3 can be sensed, and when the switch is turned on, the power source of the stacker crane can be stopped to prevent a secondary disaster.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of an elevator.

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

FIG. 3 is a plan view of the fall prevention device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Guide rail, 2 ... Carrier, 3 ... Lift chain, 7
... shaft, 12 compression spring, 14 support piece, 1
6 first lever, 17 second lever, 18 roller, 1
9 ... Link.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B65G 1/04 539 B65G 1/00 511 B66F 9/07 B66F 17/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A carrier 2 is moved up and down along a guide rail 1.
The lifting platform 3 is connected to a lifting chain 3
In the unloading operation, a pair of support pieces 14 are attached to the loading platform 2 at both ends of the guide rail 1.
A pair of wedges are mounted between the two, facing each other
The space portion A of each
The first and second levers 1 are attached to one end of the link 19
6 and 17 are connected to the first and second levers 16 and 17.
The provided rollers 18 face the pair of spaces A, respectively.
When the link 19 swings in one direction, the pair of rollers 18
Moves to the lower part of the space A with a large space, and the link 19
Swings in the other direction, the pair of rollers 18 is positioned between the space portions A.
The link 19 is formed so as to move to a small upper portion, and the other end of the link 19 is provided on the carrier 2 so as to be vertically movable.
When the shaft 7 moves upward, the lower part of the shaft 7
The link 19 swings in one direction, and the shaft 7 moves downward.
Then, the link 19 is connected so as to swing in the other direction, and the shaft 7 is moved downward by a spring,
This shaft 7 is linked to the lift chain 3 to
The lift chain is turned on when the shaft 7 is moved downward.
A switch for detecting disconnection of the shaft 3 is provided.
Fall prevention device of the elevator.