Accessory locking device for a doorknob having a keyhole therein

Locks – Special application – For control and machine elements

Patent

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Details

70158, 70163, 70427, E05B 1300

Patent

active

046319387

ABSTRACT:
The accessory locking device including hingedly connected shells having confrontable flanges that have convexly curved outer surface portions, each flange having a notch therein. A keeper tube has a slot so that the keeper tube is longitudinally slidable over the convexly curved portions of said flanges. Secured to the keeper tube is an auxiliary cylindrical lock having a projectable and retractable bolt, said bolt being projectable through a hole in the keeper tube so as to provide obstructive interference with the notches in said flanges. In this way, the keeper tube cannot be slidably withdrawn from the flanges until the bolt is fully retracted from the notches.

REFERENCES:
patent: 788435 (1905-04-01), Simpson
patent: 928820 (1909-07-01), Tabor
patent: 1814412 (1931-07-01), Rutten
patent: 1829444 (1931-10-01), Goebel et al.
patent: 2169438 (1939-08-01), Sherman
patent: 3245240 (1966-04-01), DeForrest
patent: 3636742 (1972-01-01), Raney
patent: 4296615 (1981-10-01), Zoor
patent: 4300373 (1981-11-01), Camos et al.
patent: 4561273 (1985-12-01), Robinson
patent: 4570470 (1986-02-01), Gray, Sr.

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