Retrofit doorknob lock apparatus

Details Retrofit doorknob lock apparatus Retrofit doorknob lock apparatus

1979-06-18

1981-08-25

Wolfe, Robert L.

Locks

Operating mechanism

Key

70424, 70428, 70461, E05B 1714

Patent

active

042852218

ABSTRACT:
Apparatus for securing a doorknob against unauthorized entry. A shroud fits over the entire doorknob and its associated shaft, and extends to fit on or over the rose through which the shaft extends. A clevis fits through slots in the shroud to retain the shroud in place on the door knob and shaft. The present apparatus can be used to retrofit a lock onto an existing knob which has no locking structure, and also prevents tampering or unauthorized access to an existing built-in lock cylinder of a doorknob.

REFERENCES:
patent: 1439552 (1922-12-01), Johnson
patent: 3167945 (1965-02-01), Goodman
patent: 3340709 (1967-09-01), Callahan
patent: 3343387 (1967-09-01), Cochran
patent: 3457745 (1969-07-01), Barber
patent: 3623346 (1971-11-01), Curtin
patent: 3636742 (1972-01-01), Raney
patent: 3738137 (1973-06-01), Jones
patent: 3739608 (1973-06-01), Young
patent: 3913361 (1975-10-01), Fried
patent: 3952564 (1976-04-01), Maines

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