Lock and safety release for power operated doors

Details Lock and safety release for power operated doors Lock and safety release for power operated doors

1976-12-07

1978-07-04

Downey, Kenneth

Movable or removable closures

Optionally moved, manually, or by motor

E05F 1500

Patent

active

040980235

ABSTRACT:
A lock and safety release for power operated doors of the type in which the door is normally connected to a door operator for movement thereby, and in which the connection of the door to the door operator can be released to enable manual movement of the door. The lock and safety release includes inner and outer emergency release handles at opposite sides of the door which are selectively operable to disconnect the door from the door operator, and a lock mechanism for locking the outer emergency handle to prevent its operation to disconnect the door from the door operator and to also disable the door operator to prevent powered movement of the door by the door operator. The inner release handle remains operative to disconnect the door from the door operator to enable manual operation of the door when the outer handle is locked and the power operator is disabled.

REFERENCES:
patent: 2835487 (1958-05-01), Clark

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