Duplex door safety recycling system

Details Duplex door safety recycling system Duplex door safety recycling system

1978-12-22

1980-10-14

Spar, Robert J.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

49 27, 200 6143, B66B 1300

Patent

active

042275920

ABSTRACT:
A duplex door safety recycling system, primarily for elevator doors, that includes a clutch mounted safety switch for activating an electrical control circuit to recycle and open the duplex doors when an external force is applied to a clutch-driven door in opposition to the force moving the door in the direction of closing.

REFERENCES:
patent: 2235381 (1941-03-01), McCormick
patent: 3315766 (1967-04-01), Tucker, Jr.
patent: 3868000 (1975-02-01), Spear et al.
patent: 3903647 (1975-09-01), Hubbard et al.
patent: 4045650 (1977-08-01), Nestor

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