Signals and indicators – Alarms – Burglar
Patent
1976-08-18
1978-01-10
Yasich, Daniel M.
Signals and indicators
Alarms
Burglar
116 86, G08B 1308
Patent
active
040672891
ABSTRACT:
A portable alarm useful for indicating unauthorized entry at doors and windows includes a housing and a bell casing mounted in the housing with a clacker arm rotatably mounted within the casing and adapted to create an audible signal. A trigger arm is mounted within the housing, extending into to the bell casing and is biased against the clacker arm in a first direction. An actuator including an L-shaped arm and a pressure plate is pivotably mounted along an edge of the housing such that the lever arm extends outside the housing and with the pressure plate dimensioned so as to exert a pressure against the trigger arm in a second direction opposing the first direction responsive to a movement of the lever arm. The pressure plate is biased away from the trigger arm, until such time as a substantial force against the pressure plate overcomes the bias and forces the other end of the trigger arm out of engagement with the clacker arm, thereby effecting the audible signal.
REFERENCES:
patent: 732727 (1903-07-01), Fletcher
patent: 1633374 (1927-06-01), Denser
patent: 1859345 (1932-05-01), Schantz
patent: 2084841 (1937-06-01), Fleischmann
patent: 2447527 (1948-08-01), Olvis
patent: 3131668 (1964-05-01), Stebbins
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