Diaphragm pump with a transfer chamber vent with a...

Details Diaphragm pump with a transfer chamber vent with a... Diaphragm pump with a transfer chamber vent with a...

2005-05-31

2005-05-31

Tyler, Cheryl J. (Department: 3746)

Pumps

Motor driven

Fluid motor

C417S385000, C417S386000, C417S388000

Reexamination Certificate

active

06899530

ABSTRACT:
A diaphragm pump which overcomes the problem of diaphragm failure due to overfill of the oil transfer chamber and the inability to self-prime. A notch is provided in the upper portion of the surface of the cylinder so that air can be forced back to the reservoir. In addition, the bias spring connected to the diaphragm and supported by the piston is made stiff with a spring constant that produces a bias pressure that can overcome abnormal suction pressures.

REFERENCES:
patent: 3680981 (1972-08-01), Wagner
patent: 3769879 (1973-11-01), Lofquist, Jr.
patent: 3775030 (1973-11-01), Wanner
patent: 3884598 (1975-05-01), Wanner
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patent: 4116590 (1978-09-01), Prestwich
patent: 4749342 (1988-06-01), Fritsch
patent: 4778356 (1988-10-01), Hicks
patent: 5163820 (1992-11-01), Karliner
patent: 5649813 (1997-07-01), Able et al.
patent: 5667368 (1997-09-01), Augustyn et al.
patent: 5707219 (1998-01-01), Powers
patent: 5983777 (1999-11-01), Cassaday
patent: 6071089 (2000-06-01), Maier et al.
patent: 6468056 (2002-10-01), Murakoshi
patent: 6582206 (2003-06-01), Schluecker

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