US3713755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pumping device
Assignee: Harry Krueger GmbH
•
Filing: 1971-04-16
•
Granted: 1973-01-30
•
Expires: 1991-04-16
Abstract
Abstract A pumping device having a piston pump and a drive constituted by a thrust-piston motor means actuated by a fluid motive medium, wherein at least one pump is arranged within the motor means.
Inventors
- 👤 H Scheffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:21
CPC Classifications
F; F04; F04B; F04B11/00; F04B11/005; F04B11/0075; F04B11/0083; F04B1/00; F04B1/02; F04B19/00; F04B19/02; F04B19/022; F04B5/00; F04B53/00; F04B53/10; F04B53/12; F04B53/125; F04B53/126; F04B9/00; F04B9/08; F04B9/12; F04B9/123; F04B9/125
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
A pumping device comprising, in combination, a casing having first and second, spaced, opposed covers, an outer cylinder defined in said casing having an axis extending through said covers, a thrust piston movably mounted within said outer cylinder having an internal cylinder chamber defined therein, a fixed piston mounted upon said covers slidably received within said internal cylinder, said fixed piston including axially extending first and second portions of different diameter, a passage defined in said fixed piston extending through the associated covers, valve means defined on said piston communicating with said internal chamber and said passage whereby said piston and valve means function as a pump upon movement of said thrust piston relative to said fixed piston, supply passage means communicating with said chamber, and pressurized medium supply means communicating with said outer cylinder for reciprocating the thrust piston.
Claim 2
Dependent Claim
140 words
A pumping device comprising, in combination, a casing having first and second, spaced, opposed covers, an outer cylinder defined in said casing having an axis extending through said covers, a thrust piston movably mounted within said outer cylinder having an internal cylinder chamber defined therein, a fixed piston mounted upon said covers slidably received within said internal cylinder, said fixed piston including axially extending first and second portions of different diameter, a passage defined in said fixed piston extending through the associated covers, valve means defined on said piston communicating with said internal chamber and said passage whereby said piston and valve means function as a pump upon movement of said thrust piston relative to said fixed piston, supply passage means communicating with said chamber, and pressurized medium supply means communicating with said outer cylinder for reciprocating the thrust piston.
Claim 3
Dependent Claim
140 words
A pumping device comprising, in combination, a casing having first and second, spaced, opposed covers, an outer cylinder defined in said casing having an axis extending through said covers, a thrust piston movably mounted within said outer cylinder having an internal cylinder chamber defined therein, a fixed piston mounted upon said covers slidably received within said internal cylinder, said fixed piston including axially extending first and second portions of different diameter, a passage defined in said fixed piston extending through the associated covers, valve means defined on said piston communicating with said internal chamber and said passage whereby said piston and valve means function as a pump upon movement of said thrust piston relative to said fixed piston, supply passage means communicating with said chamber, and pressurized medium supply means communicating with said outer cylinder for reciprocating the thrust piston.
Claim 4
Dependent Claim
140 words
A pumping device comprising, in combination, a casing having first and second, spaced, opposed covers, an outer cylinder defined in said casing having an axis extending through said covers, a thrust piston movably mounted within said outer cylinder having an internal cylinder chamber defined therein, a fixed piston mounted upon said covers slidably received within said internal cylinder, said fixed piston including axially extending first and second portions of different diameter, a passage defined in said fixed piston extending through the associated covers, valve means defined on said piston communicating with said internal chamber and said passage whereby said piston and valve means function as a pump upon movement of said thrust piston relative to said fixed piston, supply passage means communicating with said chamber, and pressurized medium supply means communicating with said outer cylinder for reciprocating the thrust piston.
Claim 5
Dependent Claim
34 words
In a pumping device as in claim 1 wherein a pair of passages are defined in said fixed piston, and said valve means comprises first and second valves, each valve communicating with a passage.
Claim 6
Dependent Claim
32 words
In a pumping device as in claim 2 wherein said first valve communicates with said internal chamber adjacent said fixed pistons smallest diameter and said second valve communicates with said first valve.
Claim 7
Dependent Claim
25 words
In a pumping device as in claim 1 wherein the largest diameter of said fixed piston substantially corresponds to the diameter of said internal chamber.
Claim 8
Dependent Claim
85 words
In a pumping device as in claim 1 wherein said fixed piston includes a first portion of larger diametrical dimension than said second portion, a third portion defined on said fixed piston intermediate said first and second portions having a diameter greater than that of said first portion and sealingly engaging said inner chamber, said valve means including a first valve communicating with said chamber adjacent said first fixed piston portion and a second valve communicating with said chamber adjacent said second fixed piston portion.
Claim 9
Dependent Claim
21 words
In a pumping device as in claim 5 wherein said third fixed piston portion is homogeneously integral with said first portion.
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |