JP2000103577A - Safety device for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an emergency stop device to operate even when a pull cable is damaged by usually applying tension to the pull cable, and operating the emergency stop device when the tension is lost or lowered. SOLUTION: The inner cable 10a of a pull cable is usually pulled with a spring 47 through a bracket 43. Hereat, when a main rope is cut off, the inner cable 10a is loosened, and the bracket 43 is rotated with the spring 47 in the anticlockwise direction. Hereby, the other piece of the bracket 43 pushes a lever 54, a shaft 44 is rotated in the anticlockwise direction, and a lift lever 50 is elevated. When the lift lever 50 is elevated, a wedge 52 is elevated through a shaft 51, and it is pinched between a guide rail 4 and an emergency stop block 53 to stop a car.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device which operates when a main rope suspending an elevator car is cut or loosened to stop the elevator car.

[0002]

2. Description of the Related Art An example of a conventional safety device of this type will be described with reference to FIGS. 6 is a schematic view of an elevator car, FIG. 7 is a front view of a main portion of a rope hitch portion of FIG. 6, and FIG. 8 is a front view of a main portion of an emergency stop device of FIG.

In the drawing, reference numeral 1 denotes an elevator car, 2 denotes a vertical frame of the car 1, 3 denotes a support beam of the car 1, and 4 denotes a guide rail for guiding the car 1 up and down. Reference numeral 5 denotes a main rope that suspends the car 1 and is fixed to a hitch plate 6, and a spring 8 is disposed between the hitch plate 6 and a receiving plate 7 fixed to the support beam 3. 9 is a stopper fixed to the receiving plate 7 and supports the hitch plate 6. A pull cable 10 includes an inner cable 10a and a tubular outer cable 10b surrounding the inner cable 10a. One end of the inner cable 10a is fixed to the hitch plate 6, and one end of the outer cable 10b is fixed to the receiving plate 7. Have been.

An emergency stop device 20 includes an emergency stop block 21 having an upper portion inclined in the direction of the guide rail 4, a roller 22, and a lift lever 23 for lifting the roller 22. The other end of the outer cable 10b is fixed to a support 24 fixed to the vertical frame 2, and the inner cable 10a
Is fixed to the upper end of the lift lever 23. A compression spring 25 is arranged between the outer cable 10b and the inner cable 10a.

Now, if the main rope 5 is cut, FIG.
As shown by a broken line, the hitch plate 6 is lowered by the extension force of the spring 8. As a result, the inner cable 10a is pulled to lift the lift lever 23, the roller 22 is sandwiched between the emergency stop block 21 and the guide rail 4, and the car 1 stops. When releasing the emergency stop, the roller 22 is removed by applying tension to the main rope 5 and raising the car 1.

[0006]

In the above-mentioned conventional safety device, since the safety device 20 is operated by pulling the inner cable 10a of the pull cable 10, the pull cable 10 is damaged and the tension is transmitted. If it disappears, there is a problem that the emergency stop device 20 cannot be operated.

[0007]

According to the present invention, tension is always applied to a pull cable, and when the tension is lost or reduced, an emergency stop device is operated. Further, according to the present invention, an excessive force is not applied to the pull cable when the emergency stop is released.

[0008]

1 to 5 show an embodiment of the present invention.
This will be described below. Figure 1 is a front view of the main part of the rope hitch,
2 is a side view of a main part showing the safety device, FIG. 3 is a right side view of FIG. 2, FIGS. 4 and 5 are explanatory diagrams of the safety device, and the same reference numerals as those in FIGS. Is shown.

As shown in FIG. 1, one end of the outer cable 10b of the pull cable 10 in the present embodiment is fixed to the support beam 3 via fixing brackets 30, 31. The main rope 5 includes a rope socket 32, a spring 33, and a hitch plate 3.
4, and is connected to the hitch lever 35. The hitch lever 35 is pivotally attached to the fixing bracket 30 by a shaft 36, and the inner cable 10a of the pull cable 10 is fixed to one end.

[0010] As shown in FIGS.
0 is the lower frame 40 of the car 1
The other end of the inner cable 10 a of the pull cable 10 is connected to one end 43 a of a bracket 43 having an L-shaped cross section via a connecting piece 42. The bracket 43 includes a shaft 44
, A connecting piece 45 and a rod 46 are connected to the other end, and a spring 47 is provided between the rod 46 and the rib 41. Therefore, the spring 47
Thus, the inner cable 10a of the pull cable 10 is constantly pulled through the bracket 43.

The shaft 44 passes through the lower frame 40,
A pair of lift levers 50 fixed to the shaft 44
A wedge 52 is connected via a shaft 51 to the tip of the. This wedge 52 has a triangular shape with a thin upper portion, and is disposed between the emergency stop block 53 and the guide rail 4 whose upper portion is inclined toward the guide rail 4, similarly to the conventional emergency stop device. When it rises, the car 1 is stopped by being sandwiched between the guide rail 4 and the emergency stop block 53.

Further, a lever 54 is fixed at a position in contact with the other piece 43b of the bracket 43 having an L-shaped cross section.
b. A connecting lever 55 is fixed to the end, and is connected to the emergency stop device 59 on the opposite side via a connecting piece 56, a connecting rod 57, a connecting piece 58, and the like.

In this embodiment having the above structure, when the main rope 5 is cut, the hitch lever 35 rotates clockwise about the shaft 36 by its own weight and the tension of the inner cable 10a. For this reason, the inner cable 10a
Is loosened, and the spring 47 rotates the bracket 43 counterclockwise in FIG. As a result, the other piece 43b of the bracket 43 pushes the lever 54 to rotate the shaft 44 counterclockwise, and the lift lever 50 is raised. When the lift lever 50 rises, the wedge 52 rises via the shaft 51 and is caught between the guide rail 4 and the safety block 53, and the car 1 stops. On the other hand, the rotation of the shaft 44 causes the connection piece 56, the connection rod 57, and the connection piece 58
The emergency stop device 59 on the opposite side is also operated simultaneously.

Next, when canceling the emergency stop, the car 1 is raised via the main rope 5 as in the prior art. First, tension is applied to the main rope 5, and the hitch lever 35 is rotated counterclockwise in FIG. 1 to pull the inner cable 10a. At this time, the wedge 52 remains sandwiched between the guide rail 4 and the safety block 53, and the shaft 4
Since the inner cable 4 cannot rotate, a large tension is applied to the inner cable 10a, and the inner cable 10a may be cut.

However, in this embodiment, since the bracket 44 and the lever 54 are separated, only the bracket 43 is rotated by the tension of the inner cable 10a, and the lever 54 and the bracket 43 are separated as shown in FIG. At this time, the spring 4 works on the inner cable 10a.
Since the tension is only 7, the inner cable 10a does not break.

As described above, according to the present embodiment, the inner cable 10a of the pull cable 10 is always under tension, and the emergency stop device is operated when the tension is lost or reduced. If the pull cable 10 is damaged and the tension is lost, the safety device is activated, so that there is an effect that the safety is higher than before.

Further, in the present embodiment, when the emergency stop is released, no excessive force is applied to the inner cable 10a of the pull cable 10, so that the pull cable 10 is not damaged.

In the above description, the emergency stop device is gradually used as an emergency stop device. However, an early stop device using rollers as described with reference to FIG. 8 can be similarly applied. . Further, the configuration of the hitch portion is not limited to that shown in FIG. 1 and may be any configuration as long as the tension of the inner cable is reduced when the main rope is cut or relaxed.

[0019]

As described above, according to the present invention,
When an abnormality occurs in the means for transmitting the cutting or loosening of the main rope to the safety device, the safety device is operated to provide an elevator safety device with higher safety than before.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of a rope hitch portion showing an embodiment of the present invention.

FIG. 2 is a main part side view showing the safety device according to the embodiment of the present invention.

FIG. 3 is a right side view of FIG. 2;

FIG. 4 is an explanatory diagram of an emergency stop device showing an embodiment of the present invention.

FIG. 5 is an explanatory diagram of an emergency stop device showing an embodiment of the present invention.

FIG. 6 is a schematic view of an elevator car provided with a conventional elevator safety device.

FIG. 7 is a front view of a main part of the rope hitch portion of FIG. 6;

FIG. 8 is a front view of a main part of the safety device of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Car 3 Car support beam 4 Guide rail 5 Main rope 10 Pull cable 10a Inner cable 10b Outer cable 20,59 Emergency stop device 40 Lower frame of car

Claims (2)

[Claims] 1. An elevator which stops an elevator car by operating an emergency stop device when a main rope of an elevator is cut or loosened, wherein tension is always applied, and cutting or loosening of the main rope causes loss of the tension. A safety device for an elevator, comprising a transmission means for transmitting the emergency stop device to the emergency stop device when the safety device is lowered. 2. The transmission means according to claim 1, further comprising means for not releasing the operation of the safety device even if the tension of the main rope increases during the operation of the safety device. 2. The elevator safety device according to claim 1.