Security device

Details Security device Security device

1990-06-22

1991-04-16

Smith, Gary L.

Locks

Operating mechanism

Key

70430, 292288, E05B 1304

Patent

active

050072633

ABSTRACT:
The present invention relates to an improved security device. The improved security device includes a U-shaped member which is designed to engage the shaft of a doorknob. Attached to the U-shaped member is a locking plate which has openings therein to receive either the latch of a deadbolt or the key head of a key inserted into a deadbolt. The improved security device, when in place, prevents entry into a dwelling by a person unlocking a deadbolt by preventing the rotation of a deadbolt latch or a key head inserted into the deadbolt.

REFERENCES:
patent: 674776 (1901-05-01), Kraemer
patent: 679758 (1901-08-01), Lang
patent: 850446 (1907-04-01), Robbins
patent: 2463195 (1949-03-01), Mungan
patent: 3585827 (1971-06-01), Dominguez
patent: 3933014 (1976-01-01), Moses
patent: 4827745 (1989-05-01), Baugh
patent: 4869086 (1989-09-01), Richards

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