Locks – Special application – For control and machine elements
Patent
1987-12-14
1990-06-26
Gall, Lloyd A.
Locks
Special application
For control and machine elements
70279, 70283, E05B 1300
Patent
active
049361228
ABSTRACT:
A door lock assembly comprises an outside operating section, an inside operating section and a mechanical lock, detachably mounted on a door. The outside operating section includes a switch button array which operates an electromagnetic plunger into an unlocking mode when a preselected number is set into switch buttons of the array. Operation of the electromagnetic plunger moves a mechanical on-off assembly to an off-position so that a rotatable knob can be manually rotated to operate a slidable dead bolt of the mechanical lock. The on-off assembly includes a resiliently biased slidable stop member mounted in a rotatably mounted member and having a reduced shoulder portion engageable in an opening in a cylindrical portion of a stationary hollow member, with the stop member being movable to an off-position disengaged from the opening by actuation of the electromagnetic plunger. The door lock assembly also includes a rotatable key lock for camming the stop member into its off-position, a latch bolt operating lever, an inside switch for energizing the electromagnetic plunger, and an inside operating knob and handle.
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patent: 4274272 (1981-06-01), Wang et al.
patent: 4426864 (1984-01-01), Morikawa
patent: 4509347 (1985-04-01), Young
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