Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-05-23
1980-05-27
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
340541, 340545, 340546, 116 81, 116 86, 116 94, 200 6153, 200 6176, 200 6177, 200 6179, G08B 1308, G08B 1312
Patent
active
042053056
ABSTRACT:
A burglar alarm provided with a housing which contains a bell assembly and a battery compartment connected in series with a switch assembly having a linearly movable element which can be displaced a predetermined threshold distance by a chain extending to a magnet temporarily joined to a metal bracket attached to a movable surface. The switch assembly contains a pivoted contact which moves against a fixed contact when the linearly movable element is displaced a predetermined distance, and remains there regardless of the subsequent position of the linearly moveable element until a button operationally connected to the switch assembly is moved to the "off" position. The bell assembly includes a motor having a clanger support mounted on its shaft, the clangers being loosely mounted on the clanger support so that they can strike the bell without impeding the rotation of the motor.
REFERENCES:
patent: 1115738 (1914-11-01), Randenburg
patent: 2201972 (1940-05-01), Montray et al.
patent: 2274870 (1942-03-01), Richards
patent: 2391231 (1945-12-01), Edwards
patent: 3701140 (1972-10-01), Dixon
patent: 3768086 (1973-10-01), Powell et al.
patent: 4067289 (1978-01-01), Joyner
patent: 4124847 (1978-11-01), Cashman
Caldwell Sr. John W.
Crosland Donnie L.
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