US4767123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual ring piston-ring system with spring ring bias means
Assignee: Balzers und Leybold Deutschland Holding AG
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Filing: 1986-08-28
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Granted: 1988-08-30
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Expires: 2006-08-28
Abstract
Abstract A piston-ring system has two, equal-radius, coaxial, axially-contiguous sealing rings, each ring having a split circumferential offset from the split in the other ring, each split being substantially Z-shaped in a plane normal to the axis of the rings to have a substantially-circumferential, overlappable middle portion. Each ring is urged, at least at the middle portion of its split, radially.
Inventors
- 👤 Gerhard Kiese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:51
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/06; F16J9/061; F16J9/062; F16J9/063; F16J9/12; F16J9/14; F16J9/16; F16J9/28
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
62 words
A piston-ring system, comprising: two, equal-radius, coaxial, axially-contiguous sealing rings, each ring having a split circumferentially offset from the split in the other ring, each split being substantially Z-shaped in a plane normal to the axis of the rings to have a substantially-circumferential, overlappable middle portion; and means for urging each ring at least at the middle portion of its split radially.
Claim 2
Dependent Claim
62 words
A piston-ring system, comprising: two, equal-radius, coaxial, axially-contiguous sealing rings, each ring having a split circumferentially offset from the split in the other ring, each split being substantially Z-shaped in a plane normal to the axis of the rings to have a substantially-circumferential, overlappable middle portion; and means for urging each ring at least at the middle portion of its split radially.
Claim 3
Dependent Claim
13 words
The piston-ring system of claim 1, wherein the means comprises a spring ring.
Claim 4
Dependent Claim
46 words
The piston-ring system of claim 2, in combination with a housing and a displacer of a refrigerator relatively reciprocable therein, wherein one of the housing and displacer has a radial groove for receiving the sealing and spring rings with the spring ring innermost of the groove.
Claim 5
Dependent Claim
25 words
The piston-ring system of claim 1, wherein the middle portion of each split is concentric and approximately midway of the radial width of its ring.
Claim 6
Dependent Claim
25 words
The piston-ring system of claim 2, wherein the middle portion of each split is concentric and approximately midway of the radial width of its ring.
Claim 7
Dependent Claim
25 words
The piston-ring system of claim 3, wherein the middle portion of each split is concentric and approximately midway of the radial width of its ring.
Claim 8
Dependent Claim
26 words
The piston-ring system of claim 1, wherein the middle portion of each split extends over a segment angle of from about 15 to about 45 degrees.
Claim 9
Dependent Claim
26 words
The piston-ring system of claim 2, wherein the middle portion of each split extends over a segment angle of from about 15 to about 45 degrees.
Claim 10
Dependent Claim
26 words
The piston-ring system of claim 3, wherein the middle portion of each split extends over a segment angle of from about 15 to about 45 degrees.
Claim 11
Dependent Claim
26 words
The piston-ring system of claim 4, wherein the middle portion of each split extends over a segment angle of from about 15 to about 45 degrees.
Claim 12
Dependent Claim
26 words
The piston-ring system of claim 5, wherein the middle portion of each split extends over a segment angle of from about 15 to about 45 degrees.
Claim 13
Dependent Claim
26 words
The piston-ring system of claim 6, wherein the middle portion of each split extends over a segment angle of from about 15 to about 45 degrees.
Claim 14
Dependent Claim
40 words
The piston-ring system of claim 2, wherein the sealing rings are axially contiguous in a plane and the spring ring comprises a wire coil, the axis of the wire coil being in the plane of axial contiguousness of the rings.
Claim 15
Dependent Claim
40 words
The piston-ring system of claim 3, wherein the sealing rings are axially contiguous in a plane and the spring ring comprises a wire coil, the axis of the wire coil being in the plane of axial contiguousness of the rings.
Claim 16
Dependent Claim
40 words
The piston-ring system of claim 5, wherein the sealing rings are axially contiguous in a plane and the spring ring comprises a wire coil, the axis of the wire coil being in the plane of axial contiguousness of the rings.
Claim 17
Dependent Claim
40 words
The piston-ring system of claim 6, wherein the sealing rings are axially contiguous in a plane and the spring ring comprises a wire coil, the axis of the wire coil being in the plane of axial contiguousness of the rings.
Claim 18
Dependent Claim
40 words
The piston-ring system of claim 8, wherein the sealing rings are axially contiguous in a plane and the spring ring comprises a wire coil, the axis of the wire coil being in the plane of axial contiguousness of the rings.
Claim 19
Dependent Claim
40 words
The piston-ring system of claim 9, wherein the sealing rings are axially contiguous in a plane and the spring ring comprises a wire coil, the axis of the wire coil being in the plane of axial contiguousness of the rings.
Claim 20
Dependent Claim
40 words
The piston-ring system of claim 11, wherein the sealing rings are axially contiguous in a plane and the spring ring comprises a wire coil, the axis of the wire coil being in the plane of axial contiguousness of the rings.
Claim 21
Dependent Claim
40 words
The piston-ring system of claim 12, wherein the sealing rings are axially contiguous in a plane and the spring ring comprises a wire coil, the axis of the wire coil being in the plane of axial contiguousness of the rings.
References Cited (Backward Citations)
US412227A
Cited
GB190010948A
Cited
US1391795A
Cited
US1473446A
Cited
US2877071A
Cited
US2906101A
Cited
US3455565A
Cited
US4355519A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |