US3914574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabricated piston with sprayed groove
Assignee: Wellworthy Ltd
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Filing: 1973-10-01
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Granted: 1975-10-21
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Expires: 1993-10-01
Abstract
Abstract This invention relates to a light-metal piston and a method of making the same. The piston having at least one circumferentially-extending ring groove, and is made of at least two parts fastened together, each part defining a part of the piston ring groove and at least one flank of the groove being provided with a wear-resistant coating.
Inventors
- 👤 Harold Taylor Hill
- 👤 Robert Munro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:59
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/22; B; B23; B23P; B23P15/00; B23P15/10; F02; F02F; F02F3/00; F02F3/0015; F02F3/003; F02F2003/0061; F02F2200/00; F02F2200/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49249; Y10T29/49256; Y10T29/49261; Y10T29/49826; Y10T29/49885
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
A method of manufacturing a light metal piston having a circumferentially extending piston ring groove, which method comprises the steps of producing a main cylindrical piston part having a reduced diameter portion at its head end, and an annular piston part adapted to fit over said reduced diameter portion, with each of said parts having a lateral surface defining substantially the whole of one side of said piston ring groove when said annular piston part is fitted onto said cylindrical piston part in a predetermined position relative thereto, spraying a wear-resistant coating material onto at least one of said lateral surfaces before said parts are fitted together, and subsequently fitting said parts together in said predetermined position, and electron beam welding them to each other.
Claim 2
Independent Claim
125 words
A method of manufacturing a light metal piston having a circumferentially extending piston ring groove, which method comprises the steps of producing a main cylindrical piston part having a reduced diameter portion at its head end, and an annular piston part adapted to fit over said reduced diameter portion, with each of said parts having a lateral surface defining substantially the whole of one side of said piston ring groove when said annular piston part is fitted onto said cylindrical piston part in a predetermined position relative thereto, spraying a wear-resistant coating material onto at least one of said lateral surfaces before said parts are fitted together, and subsequently fitting said parts together in said predetermined position, and electron beam welding them to each other.
Claim 3
Dependent Claim
24 words
A method as claimed in claim 1 in which said reduced diameter portion is frusto-conical and tapers inwardly toward the head of said piston.
Claim 4
Dependent Claim
45 words
A method as claimed in claim 1 in which said parts have surfaces which mate when said parts are brought into said predetermined position, said mating surfaces including portions which intersect the external surface of the piston but do not intersect the piston ring groove.
Claim 5
Dependent Claim
21 words
A method as claimed in claim 1, wherein the wear resistant coating is applied to both side faces of the groove.
Claim 6
Dependent Claim
28 words
A method as claimed in claim 1, wherein the annular piston part is of a material having a higher resistance to temperature than the remainder of the piston.
Claim 7
Independent Claim
153 words
A method of manufacturing a light metal piston having a plurality of circumferentially extending piston ring grooves therein, which method comprises the steps of producing a main cylindrical piston part having a reduced diameter portion at its head, and as many annular piston parts adapted to fit over said reduced diameter portion as there are piston ring grooves, with each of said parts having at least one lateral surface defining substantially the whole of one side of a piston groove and each piston groove being defined by surfaces on two different parts when said annular piston parts are fitted onto said cylindrical piston part in predetermined positions relative to the other parts, spraying a wear-resistant coating material onto at least one of the lateral surfaces defining each groove before said parts are fitted together, and subsequently fitting all of said parts together in said predetermined position, and electron-beam welding them to each other.
Claim 8
Independent Claim
153 words
A method of manufacturing a light metal piston having a plurality of circumferentially extending piston ring grooves therein, which method comprises the steps of producing a main cylindrical piston part having a reduced diameter portion at its head, and as many annular piston parts adapted to fit over said reduced diameter portion as there are piston ring grooves, with each of said parts having at least one lateral surface defining substantially the whole of one side of a piston groove and each piston groove being defined by surfaces on two different parts when said annular piston parts are fitted onto said cylindrical piston part in predetermined positions relative to the other parts, spraying a wear-resistant coating material onto at least one of the lateral surfaces defining each groove before said parts are fitted together, and subsequently fitting all of said parts together in said predetermined position, and electron-beam welding them to each other.
Claim 9
Dependent Claim
26 words
A method as claimeD in claim 6 in which the wear-resistant coating is applied to the side of each groove nearest the head of the piston.
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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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |