US3902826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston pump
Assignee: Feluwa Schlesiger and Co KG
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Filing: 1974-01-28
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Granted: 1975-09-02
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Expires: 1994-01-28
Abstract
Abstract The disclosure relates to a piston pump which includes a housing having a hose therewithin with the hose having opposite flanged ends, each flange being sandwiched between a portion of the housing and a flange ring, a valve casing outboard of each flange ring, a valve in each casing, and tie rod means coupling each valve casing to the housing with the tie rod means including nuts for securement and release.
Inventors
- 👤 Heinz Nagel
- 👤 Klaus Schlesiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:53
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/0009; F04B43/0081; F04B43/009; F04B23/00; F04B23/04; F04B23/06; F04B43/02; F04B43/06; F04B43/067; F04B43/08; F04B43/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
182 words
A piston pump comprising a deformable passage through which a media is adapted to flow from an inlet thereof toward an outlet thereof, a housing defining a normally closed fluid chamber, a piston mounted for reciprocal motion at least partially within said fluid chamber, means for reciprocating said piston whereby fluid within said fluid chamber is pulsated, means for utilizing the pulsating fluid to drive the media through said passage, a reservoir for said fluid, conduit meaNs for placing said reservoir in fluid communication with said fluid chamber, valve means in said conduit means for selectively introducing fluid from said conduit means into said fluid chamber, said valve means include a pair of valve seats and a valve body associated with each valve seat, pressure responsive mechanically movable means in said fluid chamber responsive to pressure within said fluid chamber for opening said valve means to permit a predetermined volume of fluid to flow through said conduit means into said fluid chamber, and excessive pressure relief valve means for relieving pressure within said fluid chamber by bleeding fluid therefrom into said reservoir.
Claim 2
Dependent Claim
182 words
A piston pump comprising a deformable passage through which a media is adapted to flow from an inlet thereof toward an outlet thereof, a housing defining a normally closed fluid chamber, a piston mounted for reciprocal motion at least partially within said fluid chamber, means for reciprocating said piston whereby fluid within said fluid chamber is pulsated, means for utilizing the pulsating fluid to drive the media through said passage, a reservoir for said fluid, conduit meaNs for placing said reservoir in fluid communication with said fluid chamber, valve means in said conduit means for selectively introducing fluid from said conduit means into said fluid chamber, said valve means include a pair of valve seats and a valve body associated with each valve seat, pressure responsive mechanically movable means in said fluid chamber responsive to pressure within said fluid chamber for opening said valve means to permit a predetermined volume of fluid to flow through said conduit means into said fluid chamber, and excessive pressure relief valve means for relieving pressure within said fluid chamber by bleeding fluid therefrom into said reservoir.
Claim 3
Dependent Claim
78 words
The piston pump as defined in claim 1 wherein the fluid bleeding caused by the operation of said excessive pressure relief valve means creates a reduction in the volume and pressure of the fluid within said fluid chamber, only one of said valve bodies is opened by said valve opening means, and the other of said valve bodies is thereby automatically opened by reservoir pressure in excess of the reduced pressure of the fluid within said fluid chamber.
Claim 4
Dependent Claim
86 words
The piston pump as defined in claim 2 wherein said valve opening means includes a bell-crank having opposite arms, means mounting said bell-crank for pivotal movement in said fluid chamber, one of said arms being aligned for moving said one valve body upon pivotal movement of said bell-crank in a predetermined direction, and means movable in response to the reduced pressure of the fluid within said fluid chamber for pivoting said bell-crank in said predetermined direction through motion imparted thereto through the second of said arms.
Claim 5
Dependent Claim
28 words
The piston pump as defined in claim 3 wherein said movable means is a dish mounted for reciprocal motion generally parallel to the reciprocal motion of said piston.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |