Device for the unlocking and locking of doors

Details Device for the unlocking and locking of doors Device for the unlocking and locking of doors

1982-05-21

1984-08-21

Holko, Thomas J.

Locks

Systems

Operation and control

70275, 70277, E05B 5300

Patent

active

044662637

ABSTRACT:
A device for the unlocking and locking of doors having pneumatic setting members in the individual door-locking mechanisms is provided centrally with a pneumatic pump (19) having a motor (18) of controlled direction of rotation. This motor can be controlled by means of a DC door switch (2). Immediately after a pressure build-up or vacuum build-up a holding-circuit switch (23) closes a holding circuit so that the DC motor (18) which drives the pneumatic pump (19) continues to operate even if it is immediately switched back directly after the making of contact by the door switch (2).
Upon an increase in vacuum or pressure, a contact finger (26) of the holding-circuit switch (23) displaces a contact bridge in such a way that it actuates a bistable change-over switch (10) via mechanical transmission members. This change-over switch (10) disconnects the DC motor (18) from the source of voltage and makes it possible for the DC motor (18) to start up in the opposite direction of rotation upon the next following actuation of the door switch.

REFERENCES:
patent: 3096112 (1963-07-01), Johnstone
patent: 3593816 (1971-07-01), Kazaoka
patent: 4270371 (1981-06-01), Kalk
patent: 4322959 (1981-04-01), Mochida

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