US3742819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telescopic piston-cylinder assembly for hydraulic machines and machine components
Assignee: New-Inuent SA
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Filing: 1971-02-12
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Granted: 1973-07-03
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Expires: 1991-02-12
Abstract
Abstract A piston-cylinder assembly is provided, comprising two interengaging sleeve members telescopically extendable and contractable. The assembly has at either end an internal frustoconical sealing surface for pivotally engaging a seat having a convex spherical surface, the contact line between the conical sleeve end and the spherical seat thus being a circle. The assembly is intended to be operated by a pressure fluid, primarily hydraulic and of a pressure of 5,000-6,000 psig. The tremendous operative force developed is automatically exactly centered between the two spherical seats, in any relative position thereof, without subjecting the sleeve members to tilting moments. By keeping the contact line diameter very close to the diameter of the effective pressure area of the assembly the seating forces are low, and therefore the friction developed during the relative pivot movements between the sleeve members and the seats is low, and yet the sealing is perfect.
Inventors
- 👤 L Freese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:52
CPC Classifications
F; F01; F01B; F01B3/00; F01B3/0032; F01B3/0044; F01B3/0052; F01B1/00; F01B1/06; F01B1/0641; F01B1/0644; F01B15/00; F01B15/002; F01B3/0082; F01B3/0085
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
244 words
A telescopic piston-cylinder assembly for use with a pressure fluid, comprising: a telescopic unit having first and second bearing surfaces formed on the opposite ends thereof; first and second reaction-force absorbing seat means respectively engaging said first and second bearing surfaces for supporting said unit; said first and second seat means having first and second seating surfaces, respectively, disposed in slidable bearing engagement with said first and second bearing surfaces, respectively, for permitting angular movement of said unit relative to at least one of said seating surfaces; said telescopic unit having a maximum cross-sectional pressure area defined by a predetermined diameter, and including a sleeve-like cylinder and a sleeve-like piston slidably received in said cylinder, the opposed ends of said cylinder and sleeve being axially overlapped, the other end of said cylinder and sleeve respectively having said first and second bearing surfaces thereon; passage means communicating with the interior of said unit for permitting pressure fluid to be supplied to the interior of said cylinder; and said one seating surface being provided with a convex spherical slide surface, and the corresponding one of said first and second bearing surfaces as disposed in engagement with said one seating surface having an internal conical configuration whereby it engages said slide surface substantially along a circular line of contact, said circular line of contact between said slide surface and the corresponding bearing surface having a diameter substantially equal to or only slightly smaller than said predetermined diameter.
Claim 2
Dependent Claim
244 words
A telescopic piston-cylinder assembly for use with a pressure fluid, comprising: a telescopic unit having first and second bearing surfaces formed on the opposite ends thereof; first and second reaction-force absorbing seat means respectively engaging said first and second bearing surfaces for supporting said unit; said first and second seat means having first and second seating surfaces, respectively, disposed in slidable bearing engagement with said first and second bearing surfaces, respectively, for permitting angular movement of said unit relative to at least one of said seating surfaces; said telescopic unit having a maximum cross-sectional pressure area defined by a predetermined diameter, and including a sleeve-like cylinder and a sleeve-like piston slidably received in said cylinder, the opposed ends of said cylinder and sleeve being axially overlapped, the other end of said cylinder and sleeve respectively having said first and second bearing surfaces thereon; passage means communicating with the interior of said unit for permitting pressure fluid to be supplied to the interior of said cylinder; and said one seating surface being provided with a convex spherical slide surface, and the corresponding one of said first and second bearing surfaces as disposed in engagement with said one seating surface having an internal conical configuration whereby it engages said slide surface substantially along a circular line of contact, said circular line of contact between said slide surface and the corresponding bearing surface having a diameter substantially equal to or only slightly smaller than said predetermined diameter.
Claim 3
Dependent Claim
30 words
An assembly according to claim 1, wherein at least one of said seat means is substantially solid and forms a reaction surface for the pressure fluid contained within said cylinder.
Claim 4
Dependent Claim
24 words
An assembly according to claim 2, wherein said passage means extends through said other seat means and communicates with the interior of said cylinder.
Claim 5
Dependent Claim
43 words
An assembly according to claim 1, wherein the annular surface between the periphery of the maximum cross-sectional pressure area of the unit and the said circular line of contact is approximately between 0.5 and 2 percent of the total maximum cross-sectional pressure area.
Claim 6
Dependent Claim
52 words
An assembly according to claim 1, further including spring means positioned externally of said unit in surrounding relationship to said piston and cylinder for resiliently urging said piston and cylinder in opposite axial direction for maintaining the opposite ends of said unit in secure engagement with said first and second seat means.
Claim 7
Dependent Claim
152 words
In a telescopic piston-cylinder assembly for a hydraulic machine including a telescopic unit having a sleeve-shaped piston slidably received in a sleeve-shaped cylinder to which a pressure medium is introduced, the unit being movably disposed between and supported on a pair of spaced reaction-force absorbing seating surfaces each engaging a respective end of the unit, comprising the improvement wherein at least one of the seating surfaces is provided with a convex spherical slide surface disposed in engagement with the adjacent end of the piston-cylinder unit, said adjacent end of said unit having an internal bearing surface of conical configuration whereby said bearing surface engages said slide surface substantially along a circular line of contact whose diameter is only slightly smaller than the maximum diameter of the active pressure area of the piston-cylinder unit, said pressure area being the interior cross-sectional area of said unit perpendicular to the longitudinal axis of said unit.
Claim 8
Dependent Claim
152 words
In a telescopic piston-cylinder assembly for a hydraulic machine including a telescopic unit having a sleeve-shaped piston slidably received in a sleeve-shaped cylinder to which a pressure medium is introduced, the unit being movably disposed between and supported on a pair of spaced reaction-force absorbing seating surfaces each engaging a respective end of the unit, comprising the improvement wherein at least one of the seating surfaces is provided with a convex spherical slide surface disposed in engagement with the adjacent end of the piston-cylinder unit, said adjacent end of said unit having an internal bearing surface of conical configuration whereby said bearing surface engages said slide surface substantially along a circular line of contact whose diameter is only slightly smaller than the maximum diameter of the active pressure area of the piston-cylinder unit, said pressure area being the interior cross-sectional area of said unit perpendicular to the longitudinal axis of said unit.
Claim 9
Dependent Claim
65 words
In an assembly according to claim 6, wherein the circle of contact has a diameter smaller than the diameter of that active pressure area so as to define a narrow annular region therebetween, said narrow angular region having an area perpendicular to the longitudinal axis of said unit of approximately between 0.5 and 2 percent of the maximum active pressure area of the piston-cylinder unit.
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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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |