Closure fasteners – Bolts – Sliding
Patent
1997-05-05
1999-03-02
Meyers, Steven
Closure fasteners
Bolts
Sliding
2922515, E05G 106
Patent
active
058760733
ABSTRACT:
An electrically operable door lock apparatus is disclosed which may be installed on a door through which access is to be controlled by an electrically operable security system, whereby the door opening mechanism is selectively locked and unlocked by controlling the supply of electricity to the door locking mechanism to thereby control access or egress through the door. The electrically operable door lock apparatus uses an electromagnetic actuator to drive a locking member in reciprocating movement between a locked position in which it engages a latch actuating member to prevent it from being rotated to retract a latch bolt to open a door, and an unlocked position in which it is disengaged from the latch actuating member to allow it to be rotated to retract the latch bolt to open the door. By reversing the position of the electromagnetic actuator in the door lock apparatus, the system may operate in either a fail secure mode in which the electromagnetic actuator must be powered to unlock the door, or a fail safe mode in which the electromagnetic actuator must be powered to lock the door.
REFERENCES:
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patent: 5474348 (1995-12-01), Palmer
Geringer Arthur
Geringer David
Geringer Richard
Estremsky Gary
Meyers Steven
Posta Jr. John J.
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