Illuminated doorknob lock

Details Illuminated doorknob lock Illuminated doorknob lock

1987-02-05

1988-10-11

Lazarus, Ira S.

Illumination

Door knob or keyhole illuminator

70431, E05B 1710

Patent

active

047775700

ABSTRACT:
For an entry door, a doorknob lock set includes an elongated stem which extends through a transverse opening in the door and is rotatable about its longitudinal axis to actuate the door latch. Doorknobs are provided at both ends of the stem to rotate the stem; and the stem includes a key lock mechanism including a key slot at the outer end of the stem. To illuminate the key lock slot, the outer doorknob is replaced by a knob fabricated from a translucent material. The translucent knob is provided with a central bore to receive the outer end of the stem; and the knob is mounted on the stem to frame the key slot. The knob is provided with at least one cavity opening from the inner face of the knob and extending toward the outer face. An illuminating device such as an incandescent bulb is placed in that cavity. Electric conductors connected to the illuminating device extend out of the cavity for connection to a source of electric energy. The source of electric energy may be a battery pack, with or without switch, mounted on the door adjacent to the exterior doorknob, or may be connected to wiring of the building structure such as the doorbell circuit.

REFERENCES:
patent: 893214 (1908-07-01), Williams et al.
patent: 941576 (1909-11-01), Hardin et al.
patent: 2676244 (1954-04-01), Dittman
patent: 2709745 (1955-05-01), Sundt
patent: 3719821 (1973-03-01), Foreman
patent: 3955075 (1976-05-01), Susedik
patent: 4310873 (1982-11-01), Bean

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