US3877349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual opposite motion extending and retracting ram fluid cylinders
Assignee: Singer Co
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Filing: 1974-05-15
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Granted: 1975-04-15
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Expires: 1994-05-15
Abstract
Abstract A dual ram fluid cylinder having one ram at each end of the fluid cylinder and wherein the rams substantially simultaneously extend or retract in the same line and in opposite directions in response to selectively directed fluid flow and wherein the extended length is large compared to the retracted length. The fluid cylinder includes an outer housing; an inner housing coaxially located within the outer housing; an outer ram slideably disposed between the outer housing and the inner housing extending exteriorly in a first direction; a fluid transmission tube coaxially located within the inner housing; and an inner ram slideably disposed between the inner housing and the fluid transmission tube extending exteriorly in a second direction.
Inventors
- 👤 Arnold Schindel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:48
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/16; F01; F01B; F01B7/00; F01B7/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
394 words
A fluid cylinder comprising: an outer housing including a tubular portion having an open first end and a radially inward extending flange defining a central opening at the second end thereof; an inner housing including a tubular portion having a flange at a first end thereof for engagement with the open first end of the tubular portion of the outer housing, the tubular portion of the inner housing extending from the flange into the interior of the outer housing, the flange on the inner housing maintaining the tubular portion of the inner housing and the tubular portion of the outer housing in a spaced relation, and a section extending radially inward at the second end of the tubular portion of the inner housing defining an orifice; a fluid transmission tube extending from the orifice toward the first end of the tubular portion of tHe inner housing with the radially inward extending section of the inner housing maintaining the fluid transmission tube and the tubular portion of the inner housing in a spaced relation; an outer ram having an annular piston portion slideably disposed between the outside diameter of the tubular portion of the inner housing and the inside diameter of the tubular portion of the outer housing, and a tubular portion extending from the piston exteriorly in a first direction through the central opening at said second end of the outer housing and terminating in a closed exterior end, the outer ram dividing the space between the inner housing and the outer housing into a first chamber, a second chamber, and a third chamber; an inner ram having an annular piston portion slideably disposed between the inside diameter of the tubular portion of the inner housing and the outside diameter of the fluid transmission tube, and a tubular portion extending from the piston of the inner ram exteriorly in a second direction and terminating in a closed exterior end, the inner ram dividing the space between the fluid transmission tube and the inner housing into a fourth chamber, a fifth chamber, and a sixth chamber; an extension fluid path means for fluidly coupling the second chamber and the fourth chamber with an external pressurized fluid flow; and a retraction fluid path means for fluidly coupling the first chamber, the third chamber, the fifth chamber, and the sixth chamber with the external pressurized fluid flow.
Claim 2
Dependent Claim
394 words
A fluid cylinder comprising: an outer housing including a tubular portion having an open first end and a radially inward extending flange defining a central opening at the second end thereof; an inner housing including a tubular portion having a flange at a first end thereof for engagement with the open first end of the tubular portion of the outer housing, the tubular portion of the inner housing extending from the flange into the interior of the outer housing, the flange on the inner housing maintaining the tubular portion of the inner housing and the tubular portion of the outer housing in a spaced relation, and a section extending radially inward at the second end of the tubular portion of the inner housing defining an orifice; a fluid transmission tube extending from the orifice toward the first end of the tubular portion of tHe inner housing with the radially inward extending section of the inner housing maintaining the fluid transmission tube and the tubular portion of the inner housing in a spaced relation; an outer ram having an annular piston portion slideably disposed between the outside diameter of the tubular portion of the inner housing and the inside diameter of the tubular portion of the outer housing, and a tubular portion extending from the piston exteriorly in a first direction through the central opening at said second end of the outer housing and terminating in a closed exterior end, the outer ram dividing the space between the inner housing and the outer housing into a first chamber, a second chamber, and a third chamber; an inner ram having an annular piston portion slideably disposed between the inside diameter of the tubular portion of the inner housing and the outside diameter of the fluid transmission tube, and a tubular portion extending from the piston of the inner ram exteriorly in a second direction and terminating in a closed exterior end, the inner ram dividing the space between the fluid transmission tube and the inner housing into a fourth chamber, a fifth chamber, and a sixth chamber; an extension fluid path means for fluidly coupling the second chamber and the fourth chamber with an external pressurized fluid flow; and a retraction fluid path means for fluidly coupling the first chamber, the third chamber, the fifth chamber, and the sixth chamber with the external pressurized fluid flow.
Claim 3
Dependent Claim
48 words
The fluid cylinder as claimed in claim 1, in which the extension fluid path means includes at least one fluid passage extending from near the first end of the inner housing to the second end of the inner housing to fluidly couple the second and the fourth chamber.
Claim 4
Dependent Claim
64 words
The fluid cylinder as claimed in claim 1, in which the retraction fluid path means includes at least one fluid passage in the outer ram to fluidly couple the first and the third chamber, the fluid transmission tube fluidly coupling the third and the fifth chamber, and at least one fluid passage in the inner ram fluidly coupling the fifth and the sixth chamber.
Claim 5
Dependent Claim
64 words
The fluid cylinder as claimed in claim 2, in which the retraction fluid path means includes at least one fluid passage in the outer ram to fluidly couple the first and the third chamber, the fluid transmission tube fluidly coupling the third and the fifth chamber, and at lease one fluid passage in the inner ram fluidly coupling the fifth and the sixth chamber.
Claim 6
Dependent Claim
44 words
The fluid cylinder as claimed in claim 1, in which the flange at the first end of the tubular portion of the inner housing includes a radially inward extending portion thereof which surrounds the outside diameter of the tubular portion of the inner ram.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |