Elevator with means for controlling upward and downward movement

Details Elevator with means for controlling upward and downward movement Elevator with means for controlling upward and downward movement

1992-03-09

1993-11-30

Olszewski, Robert P.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 68, 187 73, 188170, B66B 124

Patent

active

052657019

ABSTRACT:
In an elevator, for controlling the upward and downward movement of a cage, a shoe is brought into and out of pressing contact with a drum or a disk of a brake by a combination of a spring and a hydraulic cylinder. The optimum braking force is determined in accordance with the inertial mass and the speed of the cage to be braked, and the fluid pressure is controlled to control the force of pressing of the shoe against the drum or the disk, so that the brake can always produce the optimum braking force. A controller for controlling the pressure of the hydraulic cylinder is operated by an emergency power source. The brake can be controlled with a high responsibility and its braking force can be controlled arbitrarily, and even in the event of a power failure, the brake can be operated by the emergency power source of a small-capacity. Therefore, in the normal condition, the cage can be held accurately in its stop position, and in the event of an emergency, the optimum braking force is produced in accordance with the load and the speed of the cage, and the shortest braking distance can be achieved with a small braking impact.

REFERENCES:
patent: 3276551 (1966-10-01), Buletti et al.
patent: 3842943 (1974-10-01), Nakamura et al.
patent: 4337926 (1982-07-01), Dehaan
Japanese Patent Unexamined Publication No. 60-148879.
International Publication No. WO 86/03184 (Japanese National Publication No. 62-500864).

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