Doorknob security apparatus

Details Doorknob security apparatus Doorknob security apparatus

1984-05-21

1985-12-31

Wolfe, Robert L.

Locks

Operating mechanism

Key

70209, 70424, E05B 1714

Patent

active

045612730

ABSTRACT:
A doorknob security apparatus (10) includes an upper housing (14) and a lower housing (16) which cooperate to form a cylindrical member. Hinge parts (24) and (26) are disposed on one edge of the halves and a locking member (20) is disposed on the other side to secure the two halves together. A cover (18) is mounted in annular grooves (28) and (30) on the periphery of the two halves (14) and (16). Semi-annular rings (32) and (38) are disposed on the interior of the housings (14) and (16) to form spaces (34) and (40) while receiving the gripping portion of the doorknob. An orifice is formed with the semi-annular rings to fit about the stem of the doorknob with a diameter less than gripping portion of the doorknob to prevent removal of the apparatus (10) from the doorknob. Reinforcing portions (44) and (46) increase the structural integrity of the semi-annular members (32) and (38).

REFERENCES:
patent: 1439552 (1922-12-01), Johnson
patent: 3167945 (1965-02-01), Goodman
patent: 3245240 (1966-04-01), De Forrest
patent: 3340709 (1967-09-01), Callahan
patent: 3343387 (1967-09-01), Cochran
patent: 3623346 (1971-11-01), Curtin
patent: 3913361 (1975-10-01), Fried
patent: 3952564 (1976-04-01), Maines
patent: 4285221 (1981-08-01), Atchisson

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