Movable or removable closures – Jail-type closure with remote control station – Additional key or combination control of individual closure
Patent
1988-11-17
1989-10-10
Kannan, Philip C.
Movable or removable closures
Jail-type closure with remote control station
Additional key or combination control of individual closure
49 13, 49 20, E05B 4700
Patent
active
048722847
ABSTRACT:
A security system for detention cells is described. Known means are provided or lock to unlock the doors of all cells in a cell block. In combination with these means the present invention provides improved means for selectively unlocking the doors for individual cells in the cell block by either an electrical or a manual, "key" mode of operation. In all modes of operation the cell doors are locked when drop bars are in their lower positions and unlocked when the drop bars are raised to an elevated position. The selective unlocking means are characterized by latching means which prevent the drop bars from being raised. In the electrical mode, a motor driven cam disables the lever and raises the latching means and raises a given drop bar. In the "key" mode manually actuated means disable the latch means and raise the drop bar of a selected cell. The selective unlocking means are disclosed in combination with both sliding and pivotally mounted cell doors. Also the selective unlocking means is capable of installation where the cells in a cell block extend to either the right or left of a main control point.
REFERENCES:
patent: 2837182 (1958-06-01), White
patent: 3343302 (1967-09-01), Browning et al.
patent: 3913263 (1975-10-01), Butt
patent: 4190985 (1980-03-01), Richards et al.
patent: 4621451 (1986-11-01), Bruehler
patent: 4723373 (1988-02-01), Jump
Kannan Philip C.
Stewart Decatur Security Systems, Inc.
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