Hydraulically-actuated diaphragm pump with a leak...

Details Hydraulically-actuated diaphragm pump with a leak... Hydraulically-actuated diaphragm pump with a leak...

2006-12-11

2010-02-02

Kramer, Devon C (Department: 3746)

Pumps

Motor driven

Fluid motor

C417S388000, C417S395000, C092S086000

Reexamination Certificate

active

07654801

ABSTRACT:
A diaphragm pump including, in a pump body, a hydraulic control chamber disposed between a piston for executing reciprocating motion and the diaphragm, the pump including elements for compensating leaks from the hydraulic chamber, the elements including a refilling duct opening out into the hydraulic chamber via a normally-closed compensation shutter that is driven into the open position by the diaphragm, wherein the above-mentioned compensation shutter being driven by the diaphragm pressing against a free end of a rod for controlling the shutter, the diaphragm being subjected to the force of a suction-assistance spring which co-operates with the above-mentioned shutter to return it to its closed position by pushing the free end of the control rod back towards the diaphragm, the spring co-operating with the shutter to form a moving assembly that is moved without being deformed by the diaphragm during suction overtravel.

REFERENCES:
patent: 2919650 (1960-01-01), Wiggermann
patent: 3769879 (1973-11-01), Lofquist, Jr.
patent: 3884598 (1975-05-01), Wanner
patent: RE29055 (1976-11-01), Wagner
patent: 4416599 (1983-11-01), De Longchamp
patent: 4619589 (1986-10-01), Muller et al.
patent: 5246351 (1993-09-01), Horn et al.
patent: 5707219 (1998-01-01), Powers et al.
patent: 6481982 (2002-11-01), Yokomichi
patent: 7090474 (2006-08-01), Lehrke et al.
patent: 7425120 (2008-09-01), Hembree
patent: 2164025 (1973-07-01), None
patent: 2671139 (1992-07-01), None
patent: 59122788 (1984-07-01), None
patent: 59122789 (1984-07-01), None
patent: 59122790 (1984-07-01), None

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