Locks – Portable – Padlocks
Patent
1985-01-18
1989-03-14
Smith, Gary L.
Locks
Portable
Padlocks
70439, 70 53, 70 38A, 340542, E05B 6722, E05B 3900, E05B 4506
Patent
active
048115789
ABSTRACT:
A padlock comprises a battery-powered, built-in alarm which operates when the padlock's shackle is severed or forced open. The battery and alarm can be tested by opening the lock with a key, rotating the short leg of the shackle away from the lock body and then depressing the shackle, or optionally, by depressing the short leg. The alarm is turned on in response to the momentary closing of a switch when one shackle leg moves outwardly upon severance or forcible opening. The alarm may be an audible signal or an inaudible signal transmitted as a radio wave to a remote receiver at which an audible or visible signal is actuated. The audible signal generated at the lock escapes from the lock body through sound ports. Both audible and inaudible signals may be generated at the lock simultaneously.
REFERENCES:
patent: 2070012 (1937-02-01), Jacobi
patent: 3597944 (1971-08-01), Litvin
patent: 3772645 (1973-11-01), Odenz
patent: 3824540 (1974-07-01), Smith
patent: 3824541 (1974-07-01), Nolan
patent: 3828310 (1974-08-01), Miller
patent: 3879721 (1975-04-01), Yereance
patent: 3993987 (1976-11-01), Stevens
patent: 4057986 (1977-11-01), Zolke et al.
patent: 4546345 (1985-10-01), Naito
patent: 4556878 (1985-12-01), Masoncup et al.
Masoncup John F.
Mayer Thomas J.
John F. Masoncup
Luong Vinh
Smith Gary L.
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