Pumps – With signal – indicator – or inspection means
Patent
1975-04-24
1976-09-21
Freeh, William L.
Pumps
With signal, indicator, or inspection means
417524, 417526, 417527, 417566, 92 581, 731463, F04B 2100, F04B 2104, B60C 2302
Patent
active
039816257
ABSTRACT:
A pump having a hollow cylinder, and a piston slidably received in the cylinder, with the piston dividing the inside of the cylinder into two chambers. A hollow piston rod has one end connected to the piston and the other end extending out of the cylinder, and means is provided for attaching the other end of the piston rod to an inflatable member. The pump has one-way valve means adjacent each end of the cylinder to permit passage of air into each chamber, while preventing passage of air out of the chambers. Valve means is carried by the piston to establish communication between either of the chambers and the piston rod when the pressure in either chamber exceeds the pressure in the piston rod and inflatable member. The pump has opening means communicating between the piston rod and one of the chambers, in order that the pressure in the inflatable member is indicated by the location which the cylinder assumes relative the piston after movement of the piston to the end of the one chamber and release of the cylinder.
REFERENCES:
patent: 544998 (1895-08-01), Smith
patent: 1645788 (1927-10-01), Boies
patent: 1762625 (1930-06-01), Holt
patent: 2576687 (1951-11-01), Krehbiel
patent: 3056538 (1962-10-01), Owsen
patent: 3485180 (1969-12-01), Wickenberg et al.
Dahltron Corporation
Freeh William L.
Gilhooly Edward D.
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