Pumps – Expansible chamber type – Biasing means effects induction stroke of abutment driven,...
Patent
1996-04-22
1998-07-21
Izaguirre, Ismael
Pumps
Expansible chamber type
Biasing means effects induction stroke of abutment driven,...
417544, 417550, 600 38, F04B 3910
Patent
active
057826218
ABSTRACT:
A vacuum pump useful in penile erection systems is provided. The vacuum pump comprises a piston in a cylinder with intake and exhaust valves. The vacuum producing outstroke is powered by a spring having sufficient force to draw a vacuum no higher than the desired upper safety limit, and the reset stroke is powered manually. The pump is constructed to provide an inherent vacuum limit by selecting a spring which, when fully compressed during a reset stroke, exerts a force against the piston which is less than the force exerted against the piston head by the differential pressure between atmospheric pressure and a preselected maximum vacuum pressure inside the cylinder. Thus, when the maximum vacuum pressure is reached, the piston is not returned for successive pumping. An added safety measure is provided by a pump housing of sufficient length to enclose the pump actuator when the piston is in the reset position, thereby preventing the user from intentionally continuing to operate the pump after the preselected maximum vacuum pressure is reached.
REFERENCES:
patent: 1001175 (1911-08-01), Siebert, Jr.
patent: 2449805 (1948-09-01), Develay et al.
patent: 4718411 (1988-01-01), Stewart
patent: 4806084 (1989-02-01), Neward
patent: 5020522 (1991-06-01), Stewart
patent: 5421808 (1995-06-01), Osbon et al.
patent: 5462514 (1995-10-01), Harris
Hanor Charles W.
Izaguirre Ismael
Mission Pharmacal Company
O'Neill Kirt S.
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