Communications: electrical – Selective – Having indication or alarm
Patent
1979-08-09
1981-06-02
Caldwell, Sr, John W.
Communications: electrical
Selective
Having indication or alarm
200 511, 200 6169, 280432, 340687, B60D 112, G08B 1900
Patent
active
042714010
ABSTRACT:
A safety trailer hitch including a mechanical connection to connect a trailer to a tow vehicle with the mechanical connection secured by a latch, a backup connection between the trailer and the tow vehicle that is releasably secured to the tow vehicle, a first, normally open switch that is positioned to be closed when the mechanical connection is made, a second, normally closed switch that is positioned to be opened when the latch is closed, and a third, normally closed switch that is positioned to be opened when the backup connection is secured to the tow vehicle, with the second and third switches in parallel and in series with the first switch, an alarm and a source of electric energy in an electric circuit with the switches such that when the first switch and either of the second or third switches are closed, the alarm will be actuated.
REFERENCES:
patent: 3535679 (1970-10-01), Connors
patent: 3689717 (1972-09-01), Westenhaver
patent: 3697974 (1972-10-01), Harris, et al.
patent: 3710370 (1973-01-01), Quilici, et al.
patent: 3734539 (1973-05-01), Salmi
patent: 3792432 (1974-02-01), Ellis, et al.
patent: 3815937 (1974-06-01), Hodgson
patent: 4030775 (1977-06-01), Hill
patent: 4173353 (1979-11-01), Steele
Caldwell, Sr John W.
Chickering Robert B.
Grunewald Glen R.
Nowicki Joseph E.
Tri Delta Industries, Inc.
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