Door security system

Details Door security system Door security system

1996-07-31

1998-02-10

Lindsey, Rodney M.

Closure fasteners

Extension link

Chain

292246, E05C 1736

Patent

active

057160848

ABSTRACT:
A multi-position door security system that provides a primary locked position keeping a closed door secure and also providing varying degrees of secure openings to allow a user to see outside or accept envelopes and packages through an opening. The invention is formed of a cable and a locking bracket which is attached to the frame of the house. The cable is looped and secured around a door knob and is then passed through one or two keyway openings in the locking bracket. One or more locking fitting are rigidly attached to the cable. The locking fittings are sized such that they do not fit through the openings of the locking bracket. This allows the user to choose how far the door will open by choosing which of the locking fittings engage the locking bracket. The invention also allows for easy disengagement by the user in case of fire or emergency. Because of the design and materials used in construction, the invention is secure, economical and easy to install. The present invention is used to secure swinging and sliding doors.

REFERENCES:
patent: 186319 (1877-01-01), Dietz
patent: 878607 (1908-02-01), Cairns
patent: 3798934 (1974-03-01), Wright et al.
patent: 3804454 (1974-04-01), Simmons
patent: 3809418 (1974-05-01), Canfield
patent: 3853343 (1974-12-01), Hunter
patent: 4155577 (1979-05-01), Raymond
patent: 4478442 (1984-10-01), Martin
patent: 4560191 (1985-12-01), Grassi
patent: 5181402 (1993-01-01), Faessler et al.
patent: 5465595 (1995-11-01), Sheppard
patent: 5466022 (1995-11-01), Derman

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