Protection system for automatically openable and closable door

Details Protection system for automatically openable and closable door Protection system for automatically openable and closable door

1976-10-08

1977-11-15

Blunk, Evon C.

Movable or removable closures

Safety means responsive to obstruction to closure

Closure drive stopping or reversal

49363, 187 52R, E05F 1520, B66B 1324

Patent

active

040579344

ABSTRACT:
A protection system for an automatically openable and closable door is provided in which an increase in the driving force produced when the door encounters with a blocking force in the opening operation as caused by some obstacles is detected to stop or reverse the door opening operation, thereby to suppress or reduce any possible accidents.

REFERENCES:
patent: 2151430 (1939-03-01), Lemon
patent: 2432293 (1947-12-01), Giovanni
patent: 2998245 (1961-08-01), Adams
patent: 3050155 (1962-08-01), Karmel et al.
patent: 3403474 (1968-10-01), Spasoff
patent: 3694664 (1972-09-01), Carli
patent: 3916567 (1975-11-01), Daugirdas
patent: 3922814 (1975-12-01), Runft

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