Security device for dead bolt door lock

Details Security device for dead bolt door lock Security device for dead bolt door lock

1990-03-08

1990-08-14

Wolfe, Robert L.

Locks

Operating mechanism

Key

70419, E05B 6300

Patent

active

049476637

ABSTRACT:
The lock security device described herein is designed to prevent the turning of the lock from the opposite side of the lock, for example, by the turning of a key from the outside or opposite side of the lock. With most dead bolt door locks there is a knob on the inner side of the door by which the bolt of the lock may be moved forward into a locking position or retracted into an unlocking position. These same actions may be performed by a key inserted into the lock from the outside of the door. The security device is a simple knob on the inner side of the door with a flap which may be turned to press against the inside knob which controls the position of the bolt of the lock. When the bolt is in locked position, this flap is turned toward the bolt controlling knob and engages it to prevent turning of the same into an unlocking position. This flap is prevented from slipping to or from this engaging position by a spring on the inside of the flap knob which exerts pressure against the turning of this flap.

REFERENCES:
patent: 3423974 (1969-01-01), Bernsler
patent: 3748882 (1973-07-01), DuSault
patent: 3921423 (1975-11-01), Hollins

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