Overhead door safety apparatus

Details Overhead door safety apparatus Overhead door safety apparatus

1992-12-07

1994-03-08

Cuomo, Peter M.

Movable or removable closures

With safety brake or catch

49 13, 49197, E05D 1300

Patent

active

052916863

ABSTRACT:
A new and improved overhead door safety apparatus is disclosed for a cable controlled door whose movement is guided by a stationary guide track. The new apparatus includes a brake assembly which is attached to the door and which is responsive to a decrease in a predetermined cable tension. When the decrease in the predetermined cable tension takes place, the overhead door safety apparatus is actuated causing the brake assembly to apply a braking action on movement of the overhead door. More specifically, in the brake assembly, a cable-tension-responsive track follower guides motion of the door by following the track. The cable-tension-responsive track follower has a first and a second operating state. The first operating state permits smooth movement of the cable-tension-responsive track follower along the track as the door moves when a control cable maintains a predetermined amount of cable tension. The second operating state of the cable-tension-responsive track follower is automatically actuated and automatically provides a braking action against the track to halt movement of the overhead door when a control cable has less than the predetermined amount of cable tension, such as when a counterbalance spring breaks or when the cable itself breaks.

REFERENCES:
patent: 2103324 (1937-12-01), Down
patent: 2137196 (1938-11-01), Sampson
patent: 2185828 (1940-01-01), Blodgett
patent: 2651817 (1953-09-01), Moler
patent: 3188698 (1965-06-01), Zoll et al.
patent: 3579910 (1971-05-01), Wetter
patent: 4385471 (1983-05-01), Gabry et al.
patent: 4520591 (1985-06-01), Calvagno
patent: 4725185 (1988-02-01), Neagu
patent: 4914862 (1990-04-01), Gregory
patent: 4956938 (1990-09-01), DeMent

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