Safety device for a knob controlled door lock

Details Safety device for a knob controlled door lock Safety device for a knob controlled door lock

1977-11-04

1979-05-08

Wolfe, Robert L.

Locks

Operating mechanism

Key

70431, E05B 1500, E05B 1700

Patent

active

041529111

ABSTRACT:
A door handle lock assembly is provided for a door having opposite sides, the door being pivotally mounted in a frame and adapted to close the opening in the frame. A safety device is mounted on the door on the same side thereof as is a knob which controls a lock bolt which is adapted to be inserted into the frame to lock the door thereto. The safety device includes an elongated member which is pivotal on the door into positions of interference and non-interference with movement of the knob. The safety device is provided with two perpendicularly related flanges with a further flange which is adapted to abut against the knob when the knob is in a position of rest with the locking bolt extending outwardly into the door frame.

REFERENCES:
patent: 979331 (1910-12-01), Odenz
patent: 1055510 (1913-03-01), Birkle
patent: 1270718 (1918-06-01), Ford
patent: 1317307 (1919-09-01), Mittleburg
patent: 1700135 (1929-01-01), Lanes
patent: 3423974 (1969-01-01), Bernslex
patent: 3669480 (1972-06-01), Fugate
patent: 3921423 (1975-11-01), Hollins

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