Patent US3885291A successfully refreshed from Google Patents.
US3885291A
Expired / Lapsed
US
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Method of rebuilding a worn cam surface
Assignee: Individual
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Filing: 1973-12-07
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Granted: 1975-05-27
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Expires: 1993-12-07
Abstract
Abstract A method and apparatus for rebuilding a cam is accomplished by forming a recess at the worn cam areas. The recess has a depth and length of cut so as to encompass and denude the worn areas from the cam. Wear-strip insert means are provided with one face thereof preformed to have a contour matching the original contour of the cam area before it became worn. Preferably, the wearstrips will comprise a brittle metallic material and have a hardness greater than the cam. The wear-strip insert has a thickness and length equal to the respective depth of cut and length of the recess. The wear-strip is positioned in the recess. Means are provided for securing the wear-strip within the recess so that its preformed face meets the adjacent unworn cam areas without presenting elevational discontinuities therewith.
Inventors
- 👤 Anthony J Dichiara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:46
CPC Classifications
B; B23; B23P; B23P6/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49718; Y10T29/49732; Y10T29/49734; Y10T29/49826; Y10T29/49945
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
213 words
A method of rebuilding a worn section of a cam surface, wherein the worn section comprises less than the entire length of the cam surface, comprising the steps of: removing the worn section of the cam surface and forming a recess in the cam surface at the location of the worn section, the recess having a predetermined length along the cam surface encompassing the portion of that surface which had been worn and the recess having a predetermined depth into the cam surface that is beneath the depth of the worn cam surface Along that worn portion; forming a replacement wear strip having a length approximately equal to the predetermined length and having a depth approximately equal to the predetermined depth and having an outward surface that is shaped to the shape of the worn section of the cam surface that section of the cam surface had been worn; said wear strip being dimensioned such that when it is emplaced in the recess, the outward surface of the wear strip forms an integral continuation of the adjacent cam surface without presenting elevational discontinuities; securing the replacement wear strip in the recess such that its outward surface is flush with and forms an integral continuation of the adjacent cam surface without presenting elevational discontinuities.
Claim 2
Independent Claim
213 words
A method of rebuilding a worn section of a cam surface, wherein the worn section comprises less than the entire length of the cam surface, comprising the steps of: removing the worn section of the cam surface and forming a recess in the cam surface at the location of the worn section, the recess having a predetermined length along the cam surface encompassing the portion of that surface which had been worn and the recess having a predetermined depth into the cam surface that is beneath the depth of the worn cam surface Along that worn portion; forming a replacement wear strip having a length approximately equal to the predetermined length and having a depth approximately equal to the predetermined depth and having an outward surface that is shaped to the shape of the worn section of the cam surface that section of the cam surface had been worn; said wear strip being dimensioned such that when it is emplaced in the recess, the outward surface of the wear strip forms an integral continuation of the adjacent cam surface without presenting elevational discontinuities; securing the replacement wear strip in the recess such that its outward surface is flush with and forms an integral continuation of the adjacent cam surface without presenting elevational discontinuities.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein the replacement wear-strip is comprised of a brittle material and wherein the cam surface consists of a ductile material.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein said recess forming step is performed by milling the recess at the worn areas.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein said recess forming step is performed by abrasively cutting the recess at the worn areas.
Claim 6
Dependent Claim
28 words
The method of claim 1 wherein said step of securing is accomplished by interposing an epoxy cement layer at the interface between the replacement wear-strip and the recess.
Claim 7
Dependent Claim
24 words
The method of claim 5, wherein the predetermined length and depth of the recess are increased by the thickness of the epoxy cement layer.
Claim 8
Dependent Claim
32 words
The method of claim 1, wherein the replacement wear strip has said predetermined length of the recess such that the replacement wear strip is frictionally restrained and press fit in the recess.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |