Movable or removable closures – Jail-type closure with remote control station – Motor operated control
Patent
1991-07-11
1993-05-25
Kannan, Philip C.
Movable or removable closures
Jail-type closure with remote control station
Motor operated control
49 28, 49 30, 49139, 49506, E05B 4706, E05F 1510
Patent
active
052129080
ABSTRACT:
A symmetrical cell door and operating system comprises a vertically shiftable locking bar mounted in a center column of a cell opening. A cell door is movable in either direction relative to the central column and has upwardly facing locking notches in a lower horizontal frame element to receive the lower end of the locking bar to lock the cell door when moved either to the extreme right or to the extreme left of the center column. An elongated rack is secured to the top of the cell door by a lost motion connection and defines a cam slot engagable with a horizontally projecting actuator on the locking rod to cam the locking bar into and out of the respective locking notch. The rack is reciprocated by a pinion driven by a DC motor. Two separate banks of batteries selectively supply power to the DC motor and one bank is always being charged, thus eliminating the need for a mechanical backup system for concurrently opening or closing all cell doors in the event of a failure of the AC power supply to the building.
REFERENCES:
patent: 2792917 (1957-05-01), Smith et al.
patent: 2837182 (1958-06-01), White
patent: 2841252 (1958-07-01), Adam
patent: 3866354 (1975-02-01), Butt
patent: 4621451 (1986-11-01), Bruehler
patent: 4686598 (1987-08-01), Herr
patent: 4897959 (1990-02-01), Worden
patent: 4912878 (1990-04-01), Bentley
patent: 5040331 (1991-08-01), Merendino et al.
Adtec Incorporated
Kannan Philip C.
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