Patent US4767123A successfully refreshed from Google Patents.
US4767123A
Expired / Lapsed
US
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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 06:30
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.
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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) | 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 |