Door lock attachment

Details Door lock attachment Door lock attachment

1975-02-18

1976-01-20

Wolfe, Robert L.

Locks

Operating mechanism

Key

70447, E05B 1300

Patent

active

039330141

ABSTRACT:
A cheap, one piece, pocketable, one hand operated, snap on or off clamping attachment for a lock bolt thumb knob for preventing the lock from being opened from the outside. One end of the attachment has connected elements that can embrace the thumb knob in either its vertical or horizontal position. The connected elements have two extended legs that spring grip the door knob hub and can bias the attachment to its operative position or hold it in its inoperative position. This cheap device takes the place of a more expensive bolt and its installation cost.

REFERENCES:
patent: 1705667 (1929-03-01), Heath
patent: 2463195 (1949-03-01), Mungan
patent: 3585827 (1971-06-01), Dominguez
patent: 3862556 (1975-01-01), Moses

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