Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1984-11-14
1986-05-27
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
73302, 73308, 340 60, 340624, G08B 2100
Patent
active
045918376
ABSTRACT:
Apparatus for warning of a leak in a hydraulic system. The warning apparatus includes a liquid level sensor, mounted above the hydraulic fluid reservoir, and a signal assembly. The sensor includes an expansion chamber with a float chamber pipe inside. The float chamber pipe opens into the expansion chamber a substantial distance above the expansion chamber bottom. Hydraulic fluid, which expands when the equipment is started, flows through the open pipe end and into the expansion chamber. If the liquid level in the float chamber pipe drops below a set level, a float in the pipe also drops to activate the signal assembly. If the hydraulic system springs a leak, the alarm activates to minimize damage. Before re-starting the equipment the excess fluid held in the expansion chamber is allowed to drain back into the reservoir. Drainback is done either passively, through a constricting passageway at the expansion chamber bottom, or actively, typically by the operator after use.
REFERENCES:
patent: 1768446 (1930-06-01), Gron
patent: 2253260 (1941-08-01), Alcorn
patent: 2825895 (1958-03-01), Malagarie
patent: 3576959 (1971-05-01), Bogosoff
patent: 3673587 (1972-06-01), Baruch
patent: 4020481 (1977-04-01), Nakagawa
patent: 4057700 (1977-11-01), Nakashima
Myer Daniel
Rowland James L.
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