Patent US4244627A successfully refreshed from Google Patents.
US4244627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lift cylinder assembly
Assignee: United States Trust Company of New York
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Filing: 1979-06-08
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Granted: 1981-01-13
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Expires: 1999-06-08
Abstract
Abstract A lift cylinder including a tubular outer cylinder having an inner cylindrical surface cooperable with an extendible piston and piston rod assembly to define an annular space therebetween, and an annular guide bushing supported within the annular space in a manner to eliminate eccentricity stack-up. "Tolerance stack-up" is defined as the compounding of eccentricity by mounting one eccentric part upon another.
Inventors
- 👤 Russell Hastings, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:36
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/1423; F15B15/1433
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
178 words
In a lift cylinder assembly, the combination comprising, a tubular elongated cylinder having an open end and first and second generally concentric inner cylindrical surfaces, said first cylindrical surface being disposed adjacent said open end and of a diameter greater than the diameter of said second cylindrical surface so as to define an annular shoulder therebetween, a piston rod supported within said cylinder for longitudinal extension outwardly from said open end, said piston rod having a cylindrical peripheral surface of a diameter less than the diameter of said second inner cylinder surface and defining an annular space therebetween, sole guide bushing means supported within said cylinder adjacent said annular shoulder, said guide bushing means having an annular portion extending within said annular space between said piston rod and said second inner surface of said cylinder and adapted to receive said piston rod therethrough in sliding relation and firmly engage said adjacent second inner surface, and means associated with said cylinder and said guide bushing means to maintain said guide bushing means in fixed longitudinal position within said cylinder.
Claim 2
Dependent Claim
178 words
In a lift cylinder assembly, the combination comprising, a tubular elongated cylinder having an open end and first and second generally concentric inner cylindrical surfaces, said first cylindrical surface being disposed adjacent said open end and of a diameter greater than the diameter of said second cylindrical surface so as to define an annular shoulder therebetween, a piston rod supported within said cylinder for longitudinal extension outwardly from said open end, said piston rod having a cylindrical peripheral surface of a diameter less than the diameter of said second inner cylinder surface and defining an annular space therebetween, sole guide bushing means supported within said cylinder adjacent said annular shoulder, said guide bushing means having an annular portion extending within said annular space between said piston rod and said second inner surface of said cylinder and adapted to receive said piston rod therethrough in sliding relation and firmly engage said adjacent second inner surface, and means associated with said cylinder and said guide bushing means to maintain said guide bushing means in fixed longitudinal position within said cylinder.
Claim 3
Dependent Claim
110 words
The combination as defined in claim 1 including guide means supported on said piston rod opposite from the outer end of the piston rod which is extendible outwardly from said open end of the cylinder, said last mentioned guide means extending within said annular space between the piston rod and said second inner surface and engaging said second inner cylindrical surface in sliding relation therewith during extension and retraction of said piston rod and also engaging directly the outer peripheral surface of said piston rod, and stop means on said piston rod adapted to engage said guide bushing means and limit outward extension of said piston rod from said cylinder.
Claim 4
Dependent Claim
41 words
The combination of claim 1 wherein said means associated with said cylinder to maintain said guide bushing means in fixed longitudinal position within said cylinder includes impact ring means adapted to abut said guide bushing means and prevent longitudinal movement thereof.
Claim 5
Dependent Claim
91 words
The combination as defined in claim 3 wherein said guide bushing means includes a second annular portion having a diameter greater than the diameter of said first mentioned annular portion and of said second cylindrical surface of said cylinder, said annular portion of said guide bushing means engaging the annular shoulder between said first and second inner cylindrical surfaces of said cylinder, and wherein said impact ring means abuts said annular portion of said guide bushing to fixedly secure said annular portion between said annular shoulder and said impact ring means.
Claim 6
Dependent Claim
32 words
The combination of claim 4 including retainer ring means supported within said first inner cylindrical surface thereof, said retainer ring means being adapted to retain said impact ring means in fixed position.
Claim 7
Dependent Claim
74 words
The combination defined in claim 1 wherein said cylinder includes first and second tubular portions, said first tubular portion being secured to said second tubular portion in generally concentric relation therewith and having an inner cylindrical surface defining said first inner cylindrical surface of said cylinder, said second tubular portion of said cylinder defining said second inner cylindrical surface therein, and said annular shoulder portion comprising the outermost end of said second tubular 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) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |