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US 4,736,970 AGranted
Electrically controlled door lock
OwnerThomas K. McGourty, Lawrence R. McGourtyinventors
Life of this patent
Estimating the term…
Abstract
A latch bar is connected to the plunger of a solenoid and is movable endwise to release an exterior knob spindle to enable the spindle to actuate a latch bolt retractor. A latch carried by the latch bar is held by the retractor to maintain the latch bar open until the retractor is later actuated by the spindle, thereby enabling a single electric pulse to effect release of the lock bar.
Claims5
An electrically controlled door lock comprising
- a lock frame for mounting in said door,
- a knob spindle rotatably supported by said frame,
- a lock bolt retractor supported by said frame,
- means on said spindle for actuating said retractor upon rotation of said spindle,
- means for preventing said spindle from rotating including a locking element movable between a spindle locking position and a spindle unlocking position;
- spring means urging said locking element into said locking position,
- electromagnetic means for moving said locking element into said unlocking position,
- a latch carried by said locking element, and
- said spring means urging said latch into engagement with said retractor whereby to latch said locking element in said unlocking position,
- said retractor being effective upon actuation by said spindle to release said latch whereby to enable said spring means to move said locking element to said locking position.
7 more elements
An electrically controlled door lock comprising
- a rotatable door knob spindle,
- means for preventing said spindle from rotating including a locking element movable lengthwise of said spindle from a spindle unlocking position to a spindle locking position,
- spring means urging said locking element into said locking position,
- electromagnetic means including a plunger movable lengthwise of said spindle;
- means pivotally connecting said plunger to said locking element whereby energization of said electromagnetic means causes said plunger to move said locking element to said unlocking position,
- a spring biased latch for latching said locking element in said unlocking position upon movement of said locking element into said unlocking position, and
- means operable by said spindle upon rotation thereof for releasing said latch whereby to enable said spring means to move said locking element to said locking position.
4 more elements
An electrically controlled door lock comprising
- a lock frame for mounting in said door,
- an exterior door knob spindle rotatably supported by said frame,
- an interior door knob spindle rotatably supported by said frame,
- a lock bolt retractor supported by said frame,
- means on said exterior spindle for actuating said retractor,
- means on said interior spindle for actuating said retractor independently of said exterior spindle,
- a locking element for preventing rotation of said exterior spindle,
- means supporting said locking element for movement lengthwise of said spindles between a spindle locking position and a spindle unlocking position,
- spring means urging said locking element into said locking position,
- solenoid means carried by said interior spindle for moving said locking element into said unlocking position, and
- a latch pivotally supported by said locking element,
- said spring means urging said latch into latching engagement with said retractor whereby to latch said locking element in said unlocking position,
- said retractor being effective upon actuation by said exterior spindle to release said latch.
10 more elements
Dependencies are inferred from the claim text.