US3721162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid-actuated cylinder assemblage
Assignee: Case LLC
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Filing: 1972-01-10
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Granted: 1973-03-20
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Expires: 1992-01-10
Abstract
Abstract A fluid-actuated cylinder assemblage of a type which can be readily serviced or repaired, even in the field. A cylinder has an end cap and a piston and rod are slidable within the cylinder. The piston and rod can be threaded into assembly, and the rod is hollow so that a work tool can extend into the rod and engage the piston for controlling the piston in the screwing action between the rod and the piston for assembly and disassembly thereof. A fluid seal and a rod wiper exist between the cylinder and the rod and the seal is spaced inwardly from the end of the cylinder but is accessible for replacement when the rod is unscrewed relative to the piston and is removed from the cylinder. Also, the end cap and a fluid port and the piston itself are all arranged so that fluid can enter the cylinder to provide a working force on the piston, even when the piston is in its end limit position abutting a wall or face presented on the end cap.
Inventors
- 👤 J Kulhavy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:11
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/1423; F15B15/1447; F01; F01B; F01B17/00; F01B17/02; F16; F16J; F16J10/00; F16J10/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
157 words
In a fluid-actuated cylinder assemblage a cylinder having a fluid port, a cap on one end of said cylinder, a piston slidably disposed in said cylinder, a piston rod threaded to said piston and being slidable in said cylinder for reciprocation of said piston and said rod in said cylinder, a fluid seal interposed between said cylinder and said rod, the improvement comprising said rod being cylindrical and having a hollow interior for the entire length of said rod and with said piston being threaded into one end of said hollow rod to fluid-tightly close said rod end, and said piston having a tool-engagable portion contiguous to said hollow interior of said rod and being disposed to be accessible to a tool through the other end of said rod for the control of said piston in the relative rotation of said piston and said rod in screwing the latter two in assembly and disassembly of the assemblage.
Claim 2
Dependent Claim
157 words
In a fluid-actuated cylinder assemblage a cylinder having a fluid port, a cap on one end of said cylinder, a piston slidably disposed in said cylinder, a piston rod threaded to said piston and being slidable in said cylinder for reciprocation of said piston and said rod in said cylinder, a fluid seal interposed between said cylinder and said rod, the improvement comprising said rod being cylindrical and having a hollow interior for the entire length of said rod and with said piston being threaded into one end of said hollow rod to fluid-tightly close said rod end, and said piston having a tool-engagable portion contiguous to said hollow interior of said rod and being disposed to be accessible to a tool through the other end of said rod for the control of said piston in the relative rotation of said piston and said rod in screwing the latter two in assembly and disassembly of the assemblage.
Claim 3
Dependent Claim
106 words
The assemblage as claimed in claim 1, wherein said cap has a wall faced toward said piston and abuttable with one face of said piston for limiting the axial movement of said piston toward said one end of said cylinder during said assembly and disassembly and during the operation of said assemblage, and said port being located and said cap and said piston, in the position of said limit of axial movement of said piston being disposed and shaped to define a space in said cylinder all for the entry of fluid into said cylinder through said port and against said one face of said piston.
Claim 4
Dependent Claim
58 words
The assemblage as claimed in claim 2, wherein one end of said cap includes a cylindrical portion telescopically extending into said cylinder and being fluid tight with said cylinder, said cap one end terminating in a reduced portion between said cylindrical portion and said wall to spaced from the interior wall of said cylinder for defining said space.
Claim 5
Dependent Claim
31 words
The assemblage as claimed in claim 1, wherein said tool-engagable portion is an opening in said piston and is faced toward said other end of said rod for receiving the tool.
Claim 6
Dependent Claim
76 words
The assemblage as claimed in claim 1, wherein said cylinder includes two pieces of different internal diameters, said piston being of a circular shape of the size of the larger of said cylinder diameters and being snugly slidably disposed in said larger diameter piece, said smaller diameter piece having an end extending into said larger diameter piece and presenting an abutment for limiting the movement of said piston in the axial direction away from said cap.
Claim 7
Dependent Claim
70 words
The assemblage as claimed in claim 5, wherein said rod is of an outer diameter of the size of said smaller diameter and is snugly slidably telescoped with said smaller diameter, and said seal is disposed spaced inwardly from the outer end limit of said smaller diameter piece and is accessible for replacement only when said piston and said rod are unscrewed and said rod is removed from said cylinder.
Claim 8
Dependent Claim
54 words
The assemblage as claimed in claim 1, wherein said seal is disposed adjacent thE end of said cylinder opposite the location of said cap and spaced from the latter said cylinder end and is accessible for replacement only when said piston and said rod are unscrewed and said rod is removed from said cylinder.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |