Deadbolt safety latch

Details Deadbolt safety latch Deadbolt safety latch

2007-09-04

2007-09-04

Glessner, Brian (Department: 3676)

Closure fasteners

Portable

C292S348000, C024S067300, C024S067500, C070S416000, C070S447000

Reexamination Certificate

active

11641089

ABSTRACT:
A dead-bolt lock safety latch for preventing unauthorized unlocking of a dead-bolt lock with a key or lock picking tools provides a spring biased body having two legs, each leg having a leg extension, and carrying an elongate handle to provide mechanical leverage to temporarily overcome spring biasing of the body for moving the leg extensions away from one another for releasable engageable with a base portion of a dead bolt lock carried by a door. Protrusions on the leg extensions engage with diametrically opposed notches defined in a base portion of the deadbolt lock while deadbolt knob is positionally maintained in a medial space between the legs to prevent rotation thereof.

REFERENCES:
patent: 1004392 (1911-09-01), Ehrlich et al.
patent: 1761131 (1930-06-01), Kupfer
patent: 2942905 (1960-06-01), Wootton
patent: 3640519 (1972-02-01), Halstead
patent: 3862556 (1975-01-01), Moses
patent: 3933014 (1976-01-01), Moses
patent: 4902078 (1990-02-01), Judd
patent: 5000498 (1991-03-01), Upchurch
patent: 5369971 (1994-12-01), Sheppard
patent: 5950283 (1999-09-01), Sato

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