Doorknob guard

Details Doorknob guard Doorknob guard

1975-05-23

1977-02-15

Moore, Richard E.

Closure fasteners

Knobs

292DIG2, 292357, E05C 1918

Patent

active

040079562

ABSTRACT:
A device which protects the knob of a door lock to prevent the breaking thereof and entry includes an outer cylindrical member rotatably secured about the knob assembly by the rose of the knob assembly. An inner cylindrical member is secured about the knob assembly, and includes a plurality of axially extending grooves which engage cooperating ribs extending inwardly from the outer member. The inner member includes a hole in one end thereof to permit key access to the knob, and at least one annular friction ring disposed within the inner member for transmitting a limited magnitude of torque to the knob. The device protects the knob assembly by preventing tampering therewith and also preventing breaking the lock by applying high torque to the knob.

REFERENCES:
patent: 3306643 (1967-02-01), Reed
patent: 3428351 (1969-02-01), Volk

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