Communications: electrical – Selective – Having indication or alarm
Patent
1985-11-18
1987-07-07
Rowland, James L.
Communications: electrical
Selective
Having indication or alarm
340568, 200 6158R, 455346, G08G 1314
Patent
active
046790268
ABSTRACT:
To actuate an alarm in an automotive vehicle, already present therein, upon theft of a car radio or the like, an electrical switch is formed by a leaf spring (27) secured to a reception frame (11) installed in the vehicle, and insulated therefrom. The leaf spring (24, 24') has a free contact terminal end (27, 27') which, in one embodiment (FIGS. 2, 3), is insulated from contacting the metallic frame when the radio housing (10, 15) is properly secured in the frame by engagement of springy interlock abutments (18) in reception windows (21) in the frame. When properly secured, the free ends (27) of the springs engage a contacting metallic surface (28) on the housing (15) of the radio; upon removal of the housing, the end (27) of the leaf spring (24) rides on an insulated strip and, upon total removal, remains free, so that the switch changes state, thus actuating the alarm; in accordance with another embodiment (FIGS. 4, 5), the leaf spring (27) is lifted off from engagement with the frame by the deflectable holding springs (18) on the radio when the radio is properly installed and, upon removal, makes contact with the frame. Preferably, the contact terminals are coated with a non-corroding contact material to insure reliable operation.
REFERENCES:
patent: 408992 (1889-08-01), Schmidt
patent: 2955282 (1960-10-01), Boyle et al.
patent: 3917372 (1975-11-01), Selinko
patent: 4035765 (1977-07-01), Wenner et al.
patent: 4211995 (1980-07-01), Smith
patent: 4232288 (1980-11-01), Masterman
Fahlbusch Dieter
Knakowski Rolf
Blaupunkt-Werke GmbH
Rowland James L.
Tumm Brian R.
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