Movable or removable closures – Jail-type closure with remote control station – Motor operated control
Patent
1989-03-15
1990-02-06
Kannan, Philip C.
Movable or removable closures
Jail-type closure with remote control station
Motor operated control
49280, 49358, E05B 4706, E05F 1500
Patent
active
048979597
ABSTRACT:
A jail-cell door is suspended from an overhead carriage, for horizontal displacement between closed and open positions, and an elongate slide bar has a horizontal lost-motion connection to the carriage. The slide bar mounts a reversible electric motor and is continuously engaged to the driven one of two rollers from which the carriage and its cell door are suspended; the shaft for the other suspension roller is journaled in the carriage. For driving the cell door in the door-opening direction, the outer lost-motion limit determines an expanded wheelbase of door suspension, and for driving the cell door in the door-closing direction, the inner lost-motion limit determines a slightly reduced wheelbase of door suspension. The slide bar carries cam formations at or near its respective ends for determining locking-bolt action only at the fully closed and fully open positions of the door, and a deadlock device is pivotally carried at one end of the slide bar, serving the door-closed condition. Assurance against bodily harm upon door closing is inherent in the design of drive-roller engagement to the rail on which both rollers travel, the engagement being to provide drive-roller slip at a predetermined threshold of tractive force.
REFERENCES:
patent: 3426478 (1969-02-01), Sturges et al.
patent: 3830017 (1974-08-01), Markham
patent: 4190985 (1980-03-01), Richards et al.
patent: 4625456 (1986-12-01), La Fontaine
patent: 4641458 (1987-02-01), Pilcher et al.
Kannan Philip C.
Marotta Scientific Controls, Inc.
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