Communications: electrical – Selective – Having indication or alarm
Patent
1978-06-05
1980-02-19
Waring, Alvin H.
Communications: electrical
Selective
Having indication or alarm
340607, 340611, G08B 2100
Patent
active
041897072
ABSTRACT:
A system for warning an operator when the vacuum in a system, such as a diesel engine air intake system, exceeds a predetermined maximum because of clogging of the air cleaner or other reasons, and when the vacuum falls below a predetermined minimum value indicating loss of air cleaning action as, e.g., because of damage to the air cleaner or because of a hole or leak in the air intake system. The system includes a vacuum gauge having spaced, adjustable electrical contacts, an electrically conductive indicator movable between the contacts, and means responsive to the change in air intake system vacuum to move the indicator; and an electrical circuit having one or more visual or audible warning signal devices. The electrical contacts are connected to the circuit and the indicator is electrically grounded such that when the indicator engages one or the other of the electrical contacts on an unacceptable rise or loss of vacuum, respectively, it closes the circuit to actuate the warning signal device. The electrical circuit may include a pair of signal warning devices actuable independently to signal separately of an unacceptable rise in vacuum and an unacceptable loss in vacuum. The circuit may also include an electrically controlled valve for restricting fuel to the engine on loss of vacuum.
REFERENCES:
patent: 1853883 (1932-04-01), Roper
patent: 2834953 (1958-05-01), Bechberger et al.
patent: 3501959 (1970-03-01), Womack
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