Patent US3583837A successfully refreshed from Google Patents.
US3583837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double acting pump
Assignee: Individual
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Filing: 1969-12-18
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Granted: 1971-06-08
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Expires: 1989-12-18
Abstract
Abstract In a double-acting hand pump in which a hollow plunger reciprocates within a hollow barrel and defines with it an annular space between them, a series of valves and seals are provided which permit fluid to be drawn into the barrel and expressed from the annular space outwardly through the plunger upon extension of the plunger and drawn into the annular space and expressed out of the barrel through the plunger when the plunger is retracted. The valves and seals are designed such that, although the required fluidtight engagement of the various components is obtained, the frictional forces generated by this engagement are relatively low so that the pump may be manually operated without undue physical exertion.
Inventors
- 👤 Robert F Rolsten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:01
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/10; F04B53/12; F04B53/125; F04B53/126; B; B05; B05B; B05B9/00; B05B9/03; B05B9/04; B05B9/0403; B05B9/0426; F04B9/00; F04B9/14; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/791
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
173 words
In a double-acting pump including an elongated hollow barrel, an elongated hollow plunger slidably received in said barrel and defining with the inner surface thereof an annular space, a oneway check valve mounted at an inlet end of said barrel, and means forming a seal between an end of said barrel opposite said inlet end and the outer surface of said plunger, a combination valve assembly and seal mounted on an inlet end of said plunger comprising: a. a hollow valve housing receiving said plunger inlet end therein, b. means mounted on said housing in spaced relationship to said plunger inlet end providing sealing engagement with said inner surface of said barrel, c. a valve seat in said housing spaced from said plunger inner end, d. means providing fluid communication between the interior of said housing and said annular space, e. a valve member contained within said housing in opposition to and engageable with said seat, and f. means for limiting movement of said valve member in a direction away from said seat.
Claim 2
Dependent Claim
173 words
In a double-acting pump including an elongated hollow barrel, an elongated hollow plunger slidably received in said barrel and defining with the inner surface thereof an annular space, a oneway check valve mounted at an inlet end of said barrel, and means forming a seal between an end of said barrel opposite said inlet end and the outer surface of said plunger, a combination valve assembly and seal mounted on an inlet end of said plunger comprising: a. a hollow valve housing receiving said plunger inlet end therein, b. means mounted on said housing in spaced relationship to said plunger inlet end providing sealing engagement with said inner surface of said barrel, c. a valve seat in said housing spaced from said plunger inner end, d. means providing fluid communication between the interior of said housing and said annular space, e. a valve member contained within said housing in opposition to and engageable with said seat, and f. means for limiting movement of said valve member in a direction away from said seat.
Claim 3
Dependent Claim
33 words
The apparatus of claim 1 wherein said means providing sealing engagement with said inner surface of said barrel comprises: a. an annular flange formed integrally with said valve housing and extending outwardly thereof.
Claim 4
Dependent Claim
41 words
The apparatus of claim 2 wherein: a. said flange is defined by a pair of spaced annular grooves formed in said housing, b. one of said grooves extending inwardly of said housing at an acute angle to the longitudinal axis thereof.
Claim 5
Dependent Claim
51 words
The apparatus of claim 1 wherein said means providing sealing engagement with said inner surface of said barrel comprises: a. means defining an annular groove in said housing, and b. a resilient split ring received in said groove and extending outwardly thereof in engagement with said inner surface of said barrel.
Claim 6
Dependent Claim
28 words
The apparatus of claim 4 wherein: a. a plurality of grooves are provided in said housing, and b. a plurality of split rings are mounted in said grooves.
Claim 7
Dependent Claim
27 words
The apparatus of claim 1 wherein: a. said valve movement limiting means comprises a pin passing diametrically through said housing and said inlet end of said plunger.
Claim 8
Dependent Claim
91 words
The apparatus of claim 1 wherein said means forming a seal between said opposite end of said barrel and said outer surface of said plunger comprises: a. a collar mounted on said barrel opposite end in encircling relationship thereto, b. a portion of said collar extending outwardly of said barrel opposite end in overlying relationship to said plunger outer surface, c. means defining an annular groove in the interior surface of said portion of said collar, and d. a resilient ring received in said groove and engaging said plunger outer surface.
Claim 9
Dependent Claim
70 words
The apparatus of claim 1 wherein said one-way check valve comprises: a. a valve seat, b. a screen extending across said inlet end of said barrel in spaced relationship to said valve seat, c. a valve ball positioned intermediate said valve seat and said screen, and d. a plurality of rod members extending in spaCed parallel relationship from said valve seat to said screen to define a valve ball cage.
Claim 10
Dependent Claim
24 words
The apparatus of claim 1 further comprising: a. means for maintaining said valve member in spaced relationship to the interior wall of said housing.
Claim 11
Dependent Claim
33 words
The apparatus of claim 9 wherein: a. said valve member is a valve ball, and b. said spacing means includes a plurality of rod members positioned in said housing and extending longitudinally thereof.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |