Door lock attachment

Details Door lock attachment Door lock attachment

1975-10-14

1977-10-25

Frazier, Roy D.

Closure fasteners

Latch-spindle catches

70416, E05B 1300

Patent

active

040553612

ABSTRACT:
A thumb-knob assembly for preventing a mortise lock from being opened from the outside even by a proper key. My thumb-knob assembly may be the one shipped with the mortise lock or may be bought separately and substituted for the thumb-knob assembly that was originally installed. It affords better protection than an extra bolt or a night-latch without their installation cost, is superior in appearance, and its installed cost should be less.

REFERENCES:
patent: 179943 (1876-07-01), Neracher
patent: 956947 (1910-05-01), Curlett
patent: 991018 (1911-05-01), Powers
patent: 2125518 (1938-08-01), Oldham
patent: 2400403 (1946-05-01), Falk
patent: 3065624 (1962-11-01), Friedman

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