Locks – Systems – Operation and control
Patent
1988-04-25
1989-02-07
Wolfe, Robert L.
Locks
Systems
Operation and control
292201, 292216, E05B 5300
Patent
active
048023507
ABSTRACT:
The latch comprises a keeper (2), a fork member (3) provided with two branches (7, 8) for retaining the keeper (2), a catch (9) movable to a position for locking the fork member (3) on the keeper (2), and a control lever (12) for the catch (9) for unlocking the fork member (3). The lever (12) is connected to an outer or inner opening control (13, 14) and is associated with an electric deactivating circuit comprising switches (25, 26) and an electromechanism so arranged that an attempt to open in an unauthorized manner after the deactivation of the door causes the closure of one of the switches (25, 26) and the supply of current to the electromechanism which automatically releases the lever (12) from the catch (9) and prevents the unlocking of the latch by the catch. In the event of a breakdown of the supply battery, the lever (12) remains coupled to the catch (9) and permits the opening of the door. FIG. 1.
REFERENCES:
patent: 3620560 (1971-11-01), Peters
patent: 3624298 (1972-05-01), Strophay
patent: 3917330 (1975-11-01), Quantz
patent: 4268076 (1981-05-01), Itoi
patent: 4342209 (1982-08-01), Kleefeldt
patent: 4624491 (1986-11-01), Vincent
patent: 4667990 (1987-05-01), Quentz
patent: 4669283 (1987-06-01), Ingenhoven
Rockwell-CIM
Wolfe Robert L.
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