Movable or removable closures – Jail-type closure with remote control station – Additional key or combination control of individual closure
Patent
1988-11-29
1991-01-08
Gall, Lloyd A.
Movable or removable closures
Jail-type closure with remote control station
Additional key or combination control of individual closure
49 18, 49 20, E05B 4700
Patent
active
049825283
ABSTRACT:
A prison cell door locking device which responds to four locking modes of a prison cell locking system which uses a master bar assembly controllable from a central location to (1) release the locks of all cells, (2) lock all of the cells, (3) allow key operation of the locks at each individual cell, or (4) allow electric operation of the cell locks from the central location is provided. The device is fully assembled on a mounting plate which is provided with means for alignment with and securing onto the frame of a prison cell, and for connection to the cell door locking member. The assembled device contains mechanical and electrical components to operate the cell locks in all four modes. The device includes a master bar section which is permanently connectable into the master bar assembly, without further alignment, by long hollow channels of light weight metal. The device includes a drop bar head which carries a roller which locks the cell door by engaging a stepped notch in a roller bar by which the cell door is hung, the roller bar holding the drop bar head out of its locking position unless the door is either fully opened or closed.
REFERENCES:
patent: 1030699 (1912-06-01), Youngblood
patent: 2792917 (1957-05-01), Smith et al.
patent: 3837117 (1974-09-01), Butt
patent: 3866354 (1975-02-01), Butt
patent: 3913263 (1975-10-01), Butt
patent: 4641458 (1987-02-01), Pilcher et al.
patent: 4723373 (1988-02-01), Jump
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