Patent US3573874A successfully refreshed from Google Patents.
US3573874A
Expired / Lapsed
US
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Sealing rings
Assignee: Wellworthy Ltd
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Filing: 1968-04-08
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Granted: 1971-04-06
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Expires: 1988-04-08
Abstract
Abstract This specification discloses a sealing ring particularly a piston ring for an internal combustion engine, comprising a base ring, the outer periphery of which includes a generally plane cylindrical zone, and a coating of a wear resistant material provided on said zone. In the ring disclosed, the outer peripheral surface of the coating is provided with a plurality of axially spaced circumferentially extending lands.
Inventors
- 👤 Harold T Hill
- 👤 Ronald Morris Caton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:10
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/26; F02; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/939
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
146 words
A piston ring for a high speed internal combustion engine, comprising a base ring, the radially outer periphery of which includes a generally cylindrical zone defined by the locus of a straight line extending substantially parallel to the ring axis and moved around a generally circular path, the center of which is coincident with the ring axis, and a thin deposit of a wear resistant material possessing a hardness greater than that of the material of the base ring built up in situ on said zone to an overall radial thickness between 0.002 and 0.006 inch, the outer peripheral surface of which deposit constitutes the running surface of the sealing ring, and is provided with a plurality of axially closely spaced circumferentially extEnding lands which define therebetween a plurality of grooves, the radial depth of which is substantially less than said radial thickness of the deposit.
Claim 2
Dependent Claim
146 words
A piston ring for a high speed internal combustion engine, comprising a base ring, the radially outer periphery of which includes a generally cylindrical zone defined by the locus of a straight line extending substantially parallel to the ring axis and moved around a generally circular path, the center of which is coincident with the ring axis, and a thin deposit of a wear resistant material possessing a hardness greater than that of the material of the base ring built up in situ on said zone to an overall radial thickness between 0.002 and 0.006 inch, the outer peripheral surface of which deposit constitutes the running surface of the sealing ring, and is provided with a plurality of axially closely spaced circumferentially extEnding lands which define therebetween a plurality of grooves, the radial depth of which is substantially less than said radial thickness of the deposit.
Claim 3
Dependent Claim
29 words
A sealing ring as claimed in claim 1, wherein the wear resistant deposit is provided in a circumferentially extending channel in the outer peripheral surface of the base ring.
Claim 4
Dependent Claim
71 words
A sealing ring as claimed in claim 1, wherein an overlay of a soft bearing material lies between adjacent lands of said deposit. 4. A sealing ring as claimed in claim 2, wherein the base ring is formed from one of the following materials, namely: cast iron and steel, and wherein said wear resistant material is selected from one of the following materials, namely: chromium, molybdenum, aluminum oxide and tungsten carbide.
Claim 5
Dependent Claim
14 words
A sealing ring as claimed in claim 1 in which said deposit is chromium.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |