Patent US3179877A successfully refreshed from Google Patents.
Patent US3659504A successfully refreshed from Google Patents.
US3659504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for spacing a piston from a cylinder during operation
Assignee: Sulzer AG
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Filing: 1970-04-21
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Granted: 1972-05-02
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Expires: 1990-04-21
Abstract
Abstract The piston is provided with helical grooves in a surface facing the cylinder wall so as to impart a swirl to the heated gas escaping between the piston and cylinder from the compression chamber. The grooves are formed near the piston rod so as to obtain a uniform heating of the piston rod rather than an unbalanced heating which could cause the piston to scrape against the cylinder wall during reciprocation.
Inventors
- 👤 Alfred Zurcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:18
CPC Classifications
F; F16; F16J; F16J1/00; F04; F04B; F04B39/00; F04B39/0005; F05; F05C; F05C2203/00; F05C2203/08; F05C2203/0865; F05C2203/0882
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
In a piston compressor having a cylinder, a reciprocally mounted piston disposed within said cylinder in spaced annular relation, and a piston rod secured to said piston for driving of said piston; a labyrinth sealing means circumferentially mounted on said piston in spaced concentric relation to said cylinder, and means for imparting a swirl to a flow of gas passing from between said piston and said cylinder, said means being disposed between said labyrinth sealing means and said piston rod.
Claim 2
Dependent Claim
80 words
In a piston compressor having a cylinder, a reciprocally mounted piston disposed within said cylinder in spaced annular relation, and a piston rod secured to said piston for driving of said piston; a labyrinth sealing means circumferentially mounted on said piston in spaced concentric relation to said cylinder, and means for imparting a swirl to a flow of gas passing from between said piston and said cylinder, said means being disposed between said labyrinth sealing means and said piston rod.
Claim 3
Dependent Claim
20 words
In a piston compressor as set forth in claim 1 wherein said swirl imparting means is mounted within a ring.
Claim 4
Dependent Claim
43 words
In a piston compressor as set forth in claim 1 in which said swirl imparting means comprises a ring between said labyrinth sealing means and said piston rod, and a plurality of helical grooves in said ring in facing relation to said cylinder.
Claim 5
Dependent Claim
39 words
In a piston compressor as set forth in claim 3 which further includes an annular duct in said ring upstream of said grooves relative to the flow of gas for distributing the gas flow substantially uniformly into said grooves.
Claim 6
Dependent Claim
30 words
In a piston compressor as set forth in claim 1 wherein said swirl imparting means includes a plurality of helical grooves in said piston in facing relation to said cylinder.
Claim 7
Dependent Claim
38 words
In a piston compressor as set forth in claim 1 which further includes an annular duct upstream of said means relative to the flow of gas for distributing the gas flow sub-stantially uniformly into said swirl imparting means.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |