Electric drop bolt with slidable drive mechanism

Details Electric drop bolt with slidable drive mechanism Electric drop bolt with slidable drive mechanism

2006-05-30

2006-05-30

Estremsky, Gary (Department: 3676)

Closure fasteners

Bolts

Swinging

C292S199000

Reexamination Certificate

active

07052054

ABSTRACT:
There is an electric motor driven drop bolt having a housing which in use is mounted into a doorway frame and has the bolt pivotal therein by a mechanical drive set in a cage disposed at an operative position. The bolt is pivotal between a locking configuration where the bolt extends outward of the housing to engage in an aperture associated with a door within the frame and an unlocked configuration where the bolt is withdrawn to clear the aperture. The mechanical drive includes a screw shaft rotatable by the electric motor to move a roller nut along the length of the shaft whilst engaging a cam surface on the bolt. To obtain fail safe operation of the drop bolt the cage is slidable in the housing from the operative position to a disengaged position so that the bolt is movable from the locking configuration to the unlocked configuration without operation of the mechanical drive.

REFERENCES:
patent: 1247052 (1917-11-01), Wilson
patent: 5197771 (1993-03-01), Kaup et al.
patent: 5628216 (1997-05-01), Qureshi et al.
patent: 6386600 (2002-05-01), Kalsi
patent: 2004/0098915 (2004-05-01), Baldry

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