Chain break safety device

Details Chain break safety device Chain break safety device

1986-06-16

1987-09-29

Rolla, Joseph J.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 88, 188189, 49322, B66B 1300

Patent

active

046963758

ABSTRACT:
A chain break safety device for vertically moving, bi-parting, counter-balanced elevator doors which comprises a block having a vertical lead disposed tapered opening, said block having limited vertical moveability with respect to the door, a braking member positioned within the tapered opening, a cage for maintaining the braking member in the tapered opening, and a resilient member adapted to deflect under the tension of the counter-balance system and move said block into a non-braking position and to cause the block to move into a braking position upon failure of the counter-balance system, thus pinching the braking member between the tapered surface and a static vertical member of the elevator door system.

REFERENCES:
patent: 2300630 (1942-11-01), Norton et al.
patent: 2550839 (1951-05-01), Martin
patent: 4176826 (1979-12-01), Gray et al.

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