Security door lock

Details Security door lock Security door lock

2005-03-08

2005-03-08

Sandy, Robert J. (Department: 3677)

Closure fasteners

Extension link

C292S253000, C292S288000, C292S289000

Reexamination Certificate

active

06863319

ABSTRACT:
A security door lock that is secured by two lag bolts to the vertical wall studs forming a doorway frame. The security door lock is installed directly opposite a doorknob on the door and it has a vertically oriented base plate having at least one vertically oriented groove. A pair of cable tensioning sliders are reciprocally mounted in the vertically oriented groove. A cable has its opposite ends secured to the base plate and the cable passes around the respective cable tensioning sliders. A spring connected between the respective cable tensioning sliders keep them biased away from each other when the cable has not been looped over the doorknob. A cover plate is detachably secured to the base plate and a chamber is formed therebetween into which the cable returns when it is not being used.

REFERENCES:
patent: 3313566 (1967-04-01), Sipes
patent: 3804454 (1974-04-01), Simmons
patent: 3809417 (1974-05-01), Craig
patent: 4155578 (1979-05-01), Rolland
patent: 4281865 (1981-08-01), Nicholson
patent: 4288119 (1981-09-01), Geiger
patent: 4478442 (1984-10-01), Martin
patent: 4629229 (1986-12-01), Correnti et al.
patent: 4790581 (1988-12-01), Boswell et al.
patent: 4917422 (1990-04-01), Rose
patent: 5465595 (1995-11-01), Sheppard
patent: 5716084 (1998-02-01), Sanford et al.
patent: 5908213 (1999-06-01), Tippetts et al.

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