Safety mechanism for preventing unintended motion in traction el

Details Safety mechanism for preventing unintended motion in traction el Safety mechanism for preventing unintended motion in traction el

1989-01-24

1990-05-08

Pellinen, A. D.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 89, 187105, 188171, B66B 502

Patent

active

049230557

ABSTRACT:
A traction elevator includes a safety mechanism for preventing unintended motion of the car. A trigger, when armed, is positioned in the path of bosses on the drive sheave or another sheave, such that any unintended rotation of the sheave causes actuation of the trigger and the consequent tripping of an emergency brake. Preferably, the trigger is armed whenever the car is stopped at a landing, and is also selectively armed responsive to elevator overspeed detection.

REFERENCES:
patent: 1114180 (1914-10-01), Pearson
patent: 1444614 (1923-02-01), Kimball
patent: 2238622 (1941-04-01), Borland
patent: 2914138 (1959-11-01), Borden
patent: 4257494 (1981-03-01), Frankel
patent: 4306637 (1981-12-01), Keiser et al.
patent: 4531617 (1985-07-01), Martin et al.

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