Patent US3600045A successfully refreshed from Google Patents.
US3600045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston and rider ring combination for horizontal reciprocating compressors
Assignee: Nippon Piston Ring Co Ltd
•
Filing: 1968-08-19
•
Granted: 1971-08-17
•
Expires: 1988-08-19
Abstract
Abstract A piston having an annular groove with a radially extending projection. A rider ring carried in the groove and having an annular radially extending recess into which the projection fits. The clearance between either the rider ring and the groove or the projection and the recess is zero under normal temperatures to prevent hammering before the ring has expanded at operating temperatures.
Inventors
- 👤 Kazuo Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:58
CPC Classifications
F; F16; F16J; F16J9/00; F04; F04B; F04B39/00; F04B39/04; F04B39/041; F04B39/042; F16J9/12; F16J9/22; F16J9/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
178 words
In a device having a nonlubricated reciprocating piston with an annular groove carrying a rider ring made of a material having a large coefficient of expansion relative to the piston material, the improvement comprising: a. an annular radially extending projection in said groove; b. an annular, radially extending recess in said rider ring into which said Projection extends; c. a first set of clearances between the side surfaces of said rider ring and the side surfaces of said annular groove; d. a second set of clearances between the projection and the side surfaces of said recess; and e. one of said sets of clearances being set initially at substantially zero at ambient temperature and the other set of clearances being set to meet the amount of thermal expansion of said rider ring to an operating temperature substantially different from ambient to cause the other set of clearances to reach substantially zero at said operating temperature; whereby axial movement of the rider ring is prevented regardless of low or high temperature operation of said compressor relative to ambient temperature
Claim 2
Dependent Claim
178 words
In a device having a nonlubricated reciprocating piston with an annular groove carrying a rider ring made of a material having a large coefficient of expansion relative to the piston material, the improvement comprising: a. an annular radially extending projection in said groove; b. an annular, radially extending recess in said rider ring into which said Projection extends; c. a first set of clearances between the side surfaces of said rider ring and the side surfaces of said annular groove; d. a second set of clearances between the projection and the side surfaces of said recess; and e. one of said sets of clearances being set initially at substantially zero at ambient temperature and the other set of clearances being set to meet the amount of thermal expansion of said rider ring to an operating temperature substantially different from ambient to cause the other set of clearances to reach substantially zero at said operating temperature; whereby axial movement of the rider ring is prevented regardless of low or high temperature operation of said compressor relative to ambient temperature
Claim 3
Dependent Claim
33 words
The improvement as defined claim 1 wherein said first set of clearances is set at substantially zero at ambient temperature and said second set of clearances is set to meet the thermal expansion.
Claim 4
Dependent Claim
34 words
The improvement as defined in claim 1 wherein said second set of clearances is set at substantially zero at ambient temperature and said first set of clearances is set to meet the thermal expansion.
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |