JPH11209022A - Elevator with emergency stop device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent malfunction of an elevator emergency stop device which operates upon detecting a loosening in a rope tension. SOLUTION: An emergency stop device 8 comprises a car 5 which is suspended by a rope 4 and runs along a guide rail 6, a tension detector 7 arranged in the car 5 for detecting the tension of the rope 4, a lever 7a which is displaced by amplifying the displacement of the tension detector 7, and a braking member 8c which holds the guide rail 6 by the operation of the lever 7a. The device 8 further comprises a playably engaged part 10 arranged between the lever 7a of the tension detector 7 and the breaking member 8c which operates by the lever 7a, so that the playably engaged part 10 can play only within a certain section. This has an effect such that when the rope tension fluctuates due to shaking by the passengers or the like, malfunction of the emergency stop device is reduced, for preventing trapping passengers, unnecessary stopping of the elevator, and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator having an emergency stop device which operates by detecting a loosened rope tension.

[0002]

2. Description of the Related Art As described in JP-A-56-78783, a conventional elevator having an emergency stop device is provided with a governor and an emergency stop device caused by shaking of a passenger in a car due to mischief. In order to prevent malfunction of the car, the traveling car, the governor rope driven by the traveling of the car in the traveling direction of the car, and the emergency stop device is activated by detecting the abnormal speed of the car attached to this car An operating lever is provided to connect the car and the governor rope via a buffer, and both of the operating lever and the governor rope are allowed to float together in a predetermined section along the traveling direction of the car. Had engaged. This prevents the emergency stop device from being operated unnecessarily.

[0003]

The above prior art presupposes an elevator in which an emergency stop device is operated by a governor, and a governor such as an indirect hydraulic elevator represented by a hydraulic elevator is used. There has been a problem that no consideration has been given to an elevator for detecting a loosening of the tension of a rope that suspends a car without using the elevator, and the method cannot be applied.

[0004] It is an object of the present invention to reduce malfunction of an emergency stop device that operates due to a decrease in tension of a rope that suspends a car in an elevator without a governor.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a car which is suspended along a rope and travels along a guide rail, and a tension detector which is provided in the car and detects the tension of the rope. In an elevator equipped with an emergency stop device having a lever interlocking with a tension detector and amplifying and displacing the displacement of the tension detector and a brake element gripping a guide rail by the operation of the lever, the tension detector A floating engagement portion is provided between a lever that amplifies the displacement to be displaced and a brake element that is operated by the lever and that can move freely for a predetermined section.

[0006] With this configuration, even if the lever for detecting the rope tension is displaced due to the shaking of the passenger, the play provided on the floating engagement portion can suppress the braking operation of the brake element.

[0007]

Embodiments of the present invention will be described below. FIG. 2 is a schematic diagram illustrating a configuration of a hydraulic elevator according to one embodiment of the present invention. The fluid pressure unit 1 expands and contracts the cylinder 2 by supplying or discharging a working fluid to or from the fluid pressure cylinder 2.

A cylinder pulley 3 is rotatably mounted on the upper part of the fluid pressure cylinder 2 and a rope 4 is wound around the same. A car 5 is provided with two cage lower pulleys 5a mounted on the lower part of the car 5 and a rope 4 is provided. , And moves up and down along the guide rail 6 via the rope 4 by the expansion and contraction of the fluid pressure cylinder 2.

A counterweight 45 suspended from a rope 44 is provided to compensate for the car weight. The rope 44 includes a pulley 46 fixed to the building, a balance weight 45
Is wound around a pulley 47 attached to the pulley 47.

As shown in detail in FIG. 1, the tension detector 7 is rotatably supported by a lever 7a, and is attached to the lever 7a. The tension detection roller 7b around which the rope 4 is wound, and the displacement of the lever 7a And a spring 7d for applying a downward force to the lever 7a.

The displacement of the tension detecting roller 7b is determined by the lever 7a.
The distance a from the fulcrum 7e that rotatably supports one end of the lever 7a to the tension detecting roller 7b and the distance b from the other end (free end) of the lever 7a to the displacement b amplified by b / a times via the rod 7f. It is transmitted to the lifting lever 8a of the emergency stop device.

The free end of the lever 7a is engaged with one end of a rod 7f by a pivot, and is normally pressed toward the rope by a spring 7d. The floating engagement portion 10 is provided so that the rod 7f and the lifting lever 8a of the safety gear can freely move only in a certain section from each other.

That is, a hole extending in the longitudinal direction is provided at the end of the rod 7f, and the pin 10c provided at the end of the lifting lever 8a of the safety device is moved along the hole. Engaged. The lifting lever 8a of the emergency stop device is connected to the holding portion 8d of the brake 8c that holds the guide rail 6.

In the event of an emergency when the rope 4 is cut and the car 5 falls, the tension of the rope 4 is lost and the spring 7
The lever 7a is lowered by the force of d, and the lever 7a is rotationally displaced downward about the fulcrum 7e. When the lever 7a is displaced in the downward direction, the switch 7c operates to transmit a detection signal of a decrease in the tension of the rope 4, that is, a disconnection of the rope to the control device.

Further, the rod 7f is moved by the operation of the lever 7a.
Is lowered, but when the displacement is small, the lever 8
The end of “a” only moves relatively in the hole provided at the end of the rod 7f, and the lever 8a does not operate. When the displacement increases and the displacement of the floating engagement portion 10 becomes equal to or greater than the gap distance 10a, the emergency stop lifting lever 8a is rotationally displaced about the fulcrum 8b, and lifts the brake element holding portion 8d and the brake element 8c. When the brake element 8c is pulled up, it moves along the slope 8e provided on the brake element holding section 8d.

The lifted brake element 8c is sandwiched between the safety device 8 and the guide rail 6 and has a wedge 5 by a wedge effect.
Stop falling. Here, the emergency stop device 8 should operate assuming that the rope 4 is cut as described above. However, in the conventional device, the tension of the rope 4 fluctuates even when the elevator passenger swings in the car 5. Therefore, in the worst case, the safety device 8 operates even if the rope 4 is not cut, and there is a risk that passengers may be trapped.

In the present invention, the fluctuation of the rod 7f is interrupted by the floating engagement portion 10 provided at the connecting portion between the rod 7f and the lifting lever 8a of the safety device 8 against a slight fluctuation due to the shaking of the passenger. The emergency stop device 8 does not operate regardless of the operation lever 8a of the safety device 8. When the safety device 8 is to be operated when the rope 4 is cut, since the rotational displacement of the lever 7a is large and exceeds the gap distance 10a of the floating engagement portion 10, the safety device 8 operates.

FIG. 3 is a block diagram of a hydraulic elevator according to another embodiment of the present invention.

The hydraulic unit 1 expands and contracts the cylinder 2 by supplying or discharging a working fluid to or from the hydraulic cylinder 2. A rope 4 having one end fixed to the fluid pressure cylinder 2 is wound around a cylinder pulley 3 provided on the upper portion of the fluid pressure cylinder 2. One end of a rope 4 is connected to the car 5 and the rope 4
And moves up and down along the guide rail 6.

A balancing weight 45 suspended from a rope 44 is provided to compensate for the car weight. The rope 44 is wound around a pulley 46 fixed to the building.

As shown in FIG. 4, a tension detector 7 provided below the car 5 has a lever 7a rotatably supported by a fulcrum 7e, a switch 7c for detecting displacement of the lever 7a, and a downward force applied to the lever 7a. From the spring 7d. The displacement of the switch 7c is determined by the distances a and b from the fulcrum 7e.
As a result, the displacement amplified by b / a times is transmitted to the lifting lever 8a of the safety device 8 via the rod 7f.

At this time, the rod 7f and the lifting lever 8a of the emergency stop device 8 are provided with a floating engaging portion 10 which can move only in a certain section from each other. The lifting lever 8a of the emergency stop device 8 is connected to a holding portion 8d of a brake 8c that grips the guide rail 6.

In the event of an emergency when the rope 4 is cut and the car 5 falls, the tension of the rope 4 is lost and the spring 7
The lever 7a is rotationally displaced downward about the fulcrum 7e by the force d. When the lever 7a is displaced downward, the switch 7c operates to transmit a command to lower the tension of the rope 4, that is, to cut the rope, to the controller.

Further, the rod 7f is moved by the operation of the lever 7a.
Is lowered and the displacement of the floating engagement portion 10 becomes greater than the gap distance 10a, the emergency stop lifting lever 8a is rotationally displaced about the fulcrum 8b, and the brake retainer 8d and the brake 8c are displaced.
Pull up. The raised brake element 8c is sandwiched between the emergency stop device 8 and the guide rail 6, and stops the fall of the jaw 5 by a wedge effect.

Here, the safety device 8 is connected to the rope 4 described above.
However, in the case of the conventional apparatus, the tension of the rope 4 fluctuates even when the elevator swings in the car 5 in the conventional apparatus. In the worst case, the rope 4 is not cut. However, there is a possibility that the safety device 8 may operate and confine passengers.

On the other hand, according to the present invention, the fluctuation of the rod 7f is controlled by the floating engagement portion 10 provided at the connecting portion between the rod 7f and the safety gear lifting lever 8a for the slight fluctuation due to the shaking of the passenger and the like. Is shut off, and the safety device does not operate without being transmitted to the safety device operating lever 8a.

When the safety device is to be operated when the rope 4 is cut, the rotational displacement of the lever 7a is large,
Since the clearance distance 10a exceeds zero, the emergency stop device 8 operates. As a result, according to the present embodiment, it is possible to reduce the malfunction of the safety device, which is caused by the fluctuation of the rope tension due to the shaking of the passenger, etc., and to prevent the passenger from being confined or the unnecessary stop of the elevator. is there.

In the above-described embodiment, the floating engagement portion is provided at the connection portion between the rod 7f and the safety gear lifting lever 8a, but the guide rail 6 is gripped as in the embodiment shown in FIG. It may be provided at a connection portion between the holding portion 8d of the brake element 8c to be engaged and the lever 8a for lifting the holding element 8d of the brake element.

Further, as in the embodiment shown in FIG. 6, a brake 8c for holding the guide rail 6 is supported and the brake holder 8 is held.
The same effect can be obtained by providing a support portion 8e that does not hinder the movement of d and between the braker 8c and the brake holder holding portion 8d.
Further, in the embodiment, when the car 5 is provided with the emergency stop device 8 that operates by detecting the tension of the rope 4, the same effect is not limited to the fluid pressure elevator. There is.

[0030]

According to the present invention, it is possible to reduce the malfunction of the emergency stop device, which is caused by the fluctuation of the rope tension due to the shaking of the passenger, etc., and to prevent the passenger from being trapped or the unnecessary stop of the elevator. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an emergency stop device showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a working hydraulic elevator according to one embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a working fluid pressure elevator according to one embodiment of the present invention.

FIG. 4 is a detailed view of the safety device of FIG. 3;

FIG. 5 is a longitudinal sectional view of an emergency stop device according to another embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of an emergency stop device according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Working fluid pressure unit, 2 ... Fluid pressure cylinder, 3 ... Fluid pressure cylinder pulley, 4 ... Rope, 5 ... Basket, 6 ... Guide rail, 7 ... Tension detector, 7a ... Lever, 7b ... Tension detection roller, 7c ... Displacement detection switch, 7d ... Spring, 7
e ... fulcrum, 7f ... rod, 8 ... emergency stop device, 8a ... emergency stop device pull-up lever, 8b ... fulcrum, 8c ... braker, 8d ... braker holding part, 10 ... floating engagement part, 10a ...
Gap distance.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Haruo Watanabe 1070 Ma, Hitachinaka City, Ibaraki Prefecture Inside Mito Plant of Hitachi, Ltd. Inside Mito Factory

Claims (5)

[Claims] A cage suspended on a rope and capable of moving up and down, a guide rail for guiding the car along a moving direction, a tension detector provided on the cage for detecting a tension of the rope, In an elevator having an emergency stop device including a lever that interlocks with a tension detector and amplifies and displaces the displacement of the tension detector and a brake that grips the guide rail in accordance with the operation of the lever, A floating engagement portion is provided between the lever, which amplifies the displacement of the tension detector and displaces, and the brake element operated by the lever, so as to be able to float only in a predetermined displacement section. An elevator having an emergency stop device, wherein an operation of the brake element in response to a displacement of a lever is suppressed. 2. A car suspended by a rope and capable of moving up and down, a guide rail for guiding the car along a moving direction, and a fluid pressure for raising and lowering the car through the rope by supplying or discharging a working fluid. A cylinder, a tension detector provided in the car for detecting the tension of the rope, a lever interlocking with the tension detector, amplifying and displacing the displacement of the tension detector, and a movement of the lever. In an elevator having an emergency stop device equipped with a brake element that grips the guide rail in response, the lever that amplifies and displaces the displacement of the tension detector and the brake element that is operated by the lever A floating engagement portion is provided that can move only in a predetermined displacement section, and in this predetermined displacement section, it is possible to suppress the operation of the brake element according to the displacement of the lever. Elevator with emergency stop feature. 3. A car capable of ascending and descending, being wound around a guide rail for guiding the car along the moving direction, a pulley provided at a top and a lower part of a hydraulic cylinder, and a pulley provided at a lower part of the car. A rope fixed at both ends, a tension detector provided in the car for detecting the tension of the rope, a lever interlocking with the tension detector, amplifying and displacing the displacement of the tension detector, A brake that grips the guide rail in response to the operation of a lever, and an elevator having an emergency stop device that moves the car along the guide rail by raising and lowering the hydraulic cylinder; A floating engagement portion is provided between the lever, which amplifies the displacement to be displaced, and a brake element operated by the lever, the floating engagement portion being configured to be able to move only in a predetermined section. An elevator having an emergency stop device, characterized in that the brake element is prevented from being displaced in accordance with the displacement of the lever in a position section. 4. A rope wrapped around a pulley provided on the top of a hydraulic cylinder, one end of which is fixed to the hydraulic cylinder side, and the other end of which is fixed to a car, and the hydraulic cylinder suspended by the rope As the car travels along the guide rails, a tension detector provided in the car for detecting the tension of the rope, and a displacement interlocked with the tension detector, amplifying the displacement of the tension detector. In an elevator having an emergency stop device provided with a lever that moves and a brake that grips the guide rail by the operation of the lever, the lever that amplifies and displaces the displacement of the tension detector and that is operated by the lever A floating engagement portion is provided between the brake element and the brake element so as to allow the lever and the brake element to move relative to each other only in a predetermined section. An elevator having an emergency stop device, wherein the brake element is displaced. 5. An elevator having an emergency stop device according to claim 1, further comprising an equilibrium weight for compensating for the weight of the car.