Lock-out trolley for garage door opener

Details Lock-out trolley for garage door opener Lock-out trolley for garage door opener

1989-04-20

1990-03-06

Herrmann, Allan D.

Machine element or mechanism

Alternate manual or power operators

49139, 49360, 104120, 160188, 403109, E05F 1516, E05F 1154, G05G 1700

Patent

active

049055429

ABSTRACT:
A lock-out trolley for a garage door has a first trolley member having body and a pair of pivot pins connected thereto. A latch arm, pivotally mounted on the pivot pins, has a trolley engaging member for selectively engaging a second trolley member. A cardioid shaped aperture in the latch arm engages one of the pivot pins and may lock the latch arm out of engagement with the second trolley member. A spring biases the latch toward its engaged position.

REFERENCES:
patent: 3051014 (1962-08-01), Houk
patent: 3066729 (1962-12-01), Gessell
patent: 3235246 (1966-02-01), Cowan
patent: 3443339 (1969-05-01), Goldstein
patent: 3591981 (1971-07-01), Law
patent: 3630094 (1971-12-01), Carli
patent: 3722141 (1973-03-01), Miller
patent: 4274227 (1981-06-01), Toenjes
patent: 4597428 (1986-07-01), Iha

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