Patent US3838945A successfully refreshed from Google Patents.
US3838945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump
Assignee: Individual
•
Filing: 1973-08-15
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Granted: 1974-10-01
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Expires: 1993-08-15
Abstract
Abstract A rodless and tubeless pump, especially suited for deep-well pumping installations, has a lower pumping piston that is forced to move through its intake stroke in opposition to the direction of force in the fluid between the upper operating piston and the lower pumping piston during the compression stroke of the operating piston. The lower face of the pumping piston has a greater amount of surface area exposed to pressurized fluid from the operating piston than the upper face, thereby causing the pumping piston to rise during its intake stroke in opposition to fluid thereabove that is forced downwardly by the operating piston during its compression stroke. During the compressionrelease stroke of the operating piston, the pumping piston completes its exhaust stroke by gravity return.
Inventors
- 👤 L Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:07
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/12; E; E21; E21B; E21B43/00; E21B43/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
226 words
In a pump: tubular structure having a fluid outlet; an operating piston reciprocable within said structure through a compression stroke and a compression-release stroke; a barrel assembly spaced from said operating piston within said structure and defining a fluid chamber; a pumping piston reciprocable within said structure through an intake stroke and an exhaust stroke, said pumping piston having a first part reciprocable within said chamber and a second part reciprocable exteriorly of said chamber, said second part having a pair of opposed sides facing toward and away from said operating piston respectively, said barrel assembly having a valved inlet communicating said chamber with the exterior of said structure during the intake stroke of said pumping piston for filling the chamber, said pumping piston having a valved passage therethrough communicating said chamber with the outlet during the exhaust stroke of the pumping piston for emptying the chamber; and means for applying pressurized fluid from said operating piston against both sides of said second piston part simultaneously during the compression stroke of said operating piston, said side facing away from the operating piston having greater effective surface area exposed to the pressurized fluid than the opposite side whereby said pumping piston moves through its intake stroke in opposition to the direction of force in the fluid between the pistons during the compression stroke of the operating piston.
Claim 2
Dependent Claim
226 words
In a pump: tubular structure having a fluid outlet; an operating piston reciprocable within said structure through a compression stroke and a compression-release stroke; a barrel assembly spaced from said operating piston within said structure and defining a fluid chamber; a pumping piston reciprocable within said structure through an intake stroke and an exhaust stroke, said pumping piston having a first part reciprocable within said chamber and a second part reciprocable exteriorly of said chamber, said second part having a pair of opposed sides facing toward and away from said operating piston respectively, said barrel assembly having a valved inlet communicating said chamber with the exterior of said structure during the intake stroke of said pumping piston for filling the chamber, said pumping piston having a valved passage therethrough communicating said chamber with the outlet during the exhaust stroke of the pumping piston for emptying the chamber; and means for applying pressurized fluid from said operating piston against both sides of said second piston part simultaneously during the compression stroke of said operating piston, said side facing away from the operating piston having greater effective surface area exposed to the pressurized fluid than the opposite side whereby said pumping piston moves through its intake stroke in opposition to the direction of force in the fluid between the pistons during the compression stroke of the operating piston.
Claim 3
Dependent Claim
29 words
In a pump as claimed in claim 1, wherein said pumping piston is returned by gravity during said exhaust stroke thereof and the compression-release stroke of the operating piston.
Claim 4
Dependent Claim
31 words
In a pump as claimed in claim 1, wherein said means for applying pressurized fluid includes a cross channel in said pumping piston between said parts thereof and intersecting said passage.
Claim 5
Dependent Claim
54 words
In a pump as claimed in claim 3, wherein said first piston part is of reduced cross-sectional size relative to said second part, there being a fluid-receiving area exteriorly of said barrel assembly on said side of the piston part facing away from the operating piston for accepting pressurized fluid from said cross channel.
Claim 6
Dependent Claim
42 words
In a pump as claimed in claim 4, wherein said operating piston is disposed between said outlet and the inlet and is provided with a valved passageway therethrough for exhausting fluid to said outlet during the compression-release stroke of the operating piston.
Claim 7
Dependent Claim
32 words
In a pump as claimed in claim 5, wherein said structure is provided with means for mechanically holding the valve of said passageway open during the compression-release stroke of the operating piston.
Claim 8
Dependent Claim
42 words
In a pump as claimed in claim 1, wherein said operating piston is disposed between said outlet and the inlet and is provided with a valved passageway therethrough for exhausting fluid to said outlet during the compression-release stroke of the operating piston.
Claim 9
Dependent Claim
32 words
In a pump as claimed in claim 7, wherein said structure is provided with means for mechanically holding the valve of said passageway open during the compression-release stroke of the operating piston.
Claim 10
Dependent Claim
60 words
In a pump as claimed in claim 1, wherein said structure includes a pump casing containing said pumping piston and a pump head containing said operating piston, said casing having a cylinder supported axially therewithin in spaced relation thereto, said cylinder housing said barrel assembly and said pumping piston with said second part of the latter slidably engaging the cylinder.
Claim 11
Dependent Claim
91 words
In a pump as claimed in claim 9, wherein said assembly includes a plug portion engaging said cylinder and having said inlet, and a tube portion having said chamber and being of reduced size relative to said cylinder to define an area between the latter and said tube portion, said first piston part being of reduced cross-sectional size relative to said side facing away from said operating piston, and said pressurizeD fluid applying means including a cross channel in said pumping piston between said parts communicating said passage with said area.
Claim 12
Dependent Claim
67 words
In a pump as claimed in claim 10, wherein said plug portion is provided with a conduit therethrough bypassing said inlet and communicating said area with the opposite side of the plug portion, said cylinder having a removable stopper therein on the side of the plug portion opposite said area for opening said cylinder to additional fluid from other sources remote from the cylinder in the casing.
Claim 13
Dependent Claim
56 words
In a pump as claimed in claim 10, wherein said second piston part has a central stem of reduced cross-sectional size, said cylinder having a bushing slidably receiving said stem, said stem having an outer end defining the effective, pressurized fluid contacting surface area of said side of the second piston part facing said operating 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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |