Leveraged security door lock

Details Leveraged security door lock Leveraged security door lock

1990-05-09

1991-04-16

Moore, Richard E.

Closure fasteners

Extension link

292244, 292263, 292207, E05C 1712

Patent

active

050076698

ABSTRACT:
A leveraged door lock combines the limiting function of a door chain with a leveraged bar so that the resident has a substantial mechanical advantage enabling him or her to force the door closed against one who attempts to gain forcible entry once the door is cracked open. The entire mechanism swings between a horizontally extended operative mode, down into a vertical depending mode alongside the door, which frees the door for normal use.

REFERENCES:
patent: 876831 (1908-01-01), Olson
patent: 941493 (1909-11-01), Butler
patent: 2091015 (1937-08-01), Sargent
patent: 3761135 (1973-09-01), Mundinger et al.
patent: 4067598 (1978-01-01), Monsour

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