Patent US5337476A successfully refreshed from Google Patents.
US5337476A
Expired / Lapsed
US
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Method of making a camshaft
Assignee: Torrington Co Ltd
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Filing: 1994-01-12
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Granted: 1994-08-16
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Expires: 2014-01-12
Abstract
Abstract A method of forming a camshaft tube having a plurality of thinner wall sections adjacent to thicker wall sections. The diameter of a hollow tube is mechanically reduced with a retractable mandrel inserted in the hollow tube. The retractable mandrel has a first portion having a larger diameter than an adjacent second portion. To form a thinner wall section, the larger diameter first portion is positioned under a reducing tool. To form a thicker portion, the smaller diameter second portion is positioned under a reducing tool.
Inventors
- 👤 Louis V. Orsini, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:25
CPC Classifications
B; B21; B21D; B21D39/00; B21D39/06; B21C; B21C1/00; B21C1/16; B21C1/22; B21C1/24; B21C37/00; B21C37/06; B21C37/15; B21C37/16; B21D53/00; B21D53/84; B21D53/845; B21K; B21K1/00; B21K1/06; B21K1/063; B21K1/12; B23; B23P; B23P11/00; B23P11/005; F; F01; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; F16; F16H; F16H53/00; F16H53/02; F16H53/025; B23P2700/00; B23P2700/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49293; Y10T29/49826; Y10T29/49908; Y10T29/49938; Y10T29/4994; Y10T74/00; Y10T74/21; Y10T74/2101
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
128 words
A method of forming a camshaft tube comprising the steps of: providing a hollow tube; providing a retractable mandrel, the retractable mandrel having a first portion and a second portion adjacent the first portion, the diameter of the first portion being larger than the diameter of the second portion; inserting the retractable mandrel into the hollow tube; mechanically reducing a first section of the hollow tube, the first portion of the retractable mandrel being positioned under the section of the hollow tube being reduced; positioning the second portion of the retractable mandrel under a second section of the hollow tube; and mechanically reducing the second section of the hollow tube, the second portion of the retractable mandrel being positioned under the section of the hollow tube being reduced.
Claim 2
Independent Claim
128 words
A method of forming a camshaft tube comprising the steps of: providing a hollow tube; providing a retractable mandrel, the retractable mandrel having a first portion and a second portion adjacent the first portion, the diameter of the first portion being larger than the diameter of the second portion; inserting the retractable mandrel into the hollow tube; mechanically reducing a first section of the hollow tube, the first portion of the retractable mandrel being positioned under the section of the hollow tube being reduced; positioning the second portion of the retractable mandrel under a second section of the hollow tube; and mechanically reducing the second section of the hollow tube, the second portion of the retractable mandrel being positioned under the section of the hollow tube being reduced.
Claim 3
Dependent Claim
110 words
The method according to claim 1, further comprising: repeating the steps of mechanically reducing a first section of the hollow tube, the first portion of the retractable mandrel being positioned under the section of the hollow tube being reduced; positioning the second portion of the retractable mandrel under a second section of the hollow tube; and mechanically reducing the second section of the hollow tube, the second portion of the retractable mandrel being positioned under the section of the hollow tube being reduced, thereby forming a plurality of first sections and second sections, the inner diameter of a first section being larger than the inner diameter of a second section.
Claim 4
Dependent Claim
23 words
The method according to claim 1, further comprising: providing a swaging tool; and using the swaging tool to mechanically reduce the hollow tube.
Claim 5
Independent Claim
304 words
A method of forming a camshaft tube comprising the steps of: providing a hollow tube; providing an axially extending retractable mandrel, the retractable mandrel having a first portion and a second portion adjacent the first portion, the diameter of the first portion being larger than the diameter of the second portion, the second portion being an end of the retractable mandrel; inserting the retractable mandrel into the hollow tube; positioning the retractable mandrel whereby the first portion of the retractable mandrel is positioned under a first section of the hollow tube; providing a swaging tool; mechanically reducing the first section of the hollow tube by pushing the hollow tube through the swaging tool, the retractable mandrel also being moved to keep the first portion of the retractable mandrel positioned under the section of the hollow tube being reduced; retracting the retractable mandrel to position the second portion of the retractable mandrel under a second section of the hollow tube; mechanically reducing the second section of the hollow tube; repeating the steps of positioning the retractable mandrel whereby the first portion of the retractable mandrel is positioned under a first section of the hollow tube; mechanically reducing the first section of the hollow tube by pushing the hollow tube through the swaging tool, the retractable mandrel also being moved to keep the first portion of the retractable mandrel positioned under the section of the hollow tube being reduced; retracting the retractable mandrel to position the second portion of the retractable mandrel under a second section of the hollow tube; and mechanically reducing the second section of the hollow tube by pushing the hollow tube through the swaging tool, thereby forming a plurality of first sections and second sections, the inner diameter of a first section being larger than the inner diameter of a second section.
Claim 6
Independent Claim
304 words
A method of forming a camshaft tube comprising the steps of: providing a hollow tube; providing an axially extending retractable mandrel, the retractable mandrel having a first portion and a second portion adjacent the first portion, the diameter of the first portion being larger than the diameter of the second portion, the second portion being an end of the retractable mandrel; inserting the retractable mandrel into the hollow tube; positioning the retractable mandrel whereby the first portion of the retractable mandrel is positioned under a first section of the hollow tube; providing a swaging tool; mechanically reducing the first section of the hollow tube by pushing the hollow tube through the swaging tool, the retractable mandrel also being moved to keep the first portion of the retractable mandrel positioned under the section of the hollow tube being reduced; retracting the retractable mandrel to position the second portion of the retractable mandrel under a second section of the hollow tube; mechanically reducing the second section of the hollow tube; repeating the steps of positioning the retractable mandrel whereby the first portion of the retractable mandrel is positioned under a first section of the hollow tube; mechanically reducing the first section of the hollow tube by pushing the hollow tube through the swaging tool, the retractable mandrel also being moved to keep the first portion of the retractable mandrel positioned under the section of the hollow tube being reduced; retracting the retractable mandrel to position the second portion of the retractable mandrel under a second section of the hollow tube; and mechanically reducing the second section of the hollow tube by pushing the hollow tube through the swaging tool, thereby forming a plurality of first sections and second sections, the inner diameter of a first section being larger than the inner diameter of a second section.
Claim 7
Independent Claim
283 words
A method of making a camshaft comprising the steps of: providing a hollow tube; providing a retractable mandrel, the retractable mandrel having a first portion and a second portion adjacent the first portion, the diameter of the first portion being larger than the diameter of the second portion; inserting the retractable mandrel into the hollow tube; mechanically reducing a first section of the hollow tube, the first portion of the retractable mandrel being positioned under the section of the hollow tube being reduced; positioning the second portion of the retractable mandrel under a second section of the hollow tube; mechanically reducing the second section of the hollow tube, the second portion of the retractable mandrel being positioned under the section of the hollow tube being reduced; repeating the steps of mechanically reducing a first section of the hollow tube, the first portion of the retractable mandrel being positioned under the section of the hollow tube being reduced; positioning the second portion of the retractable mandrel under a second section of the hollow tube; and mechanically reducing the second section of the hollow tube, the second portion of the retractable mandrel being positioned under the section of the hollow tube being reduced, thereby forming a plurality of first sections and second sections, the inner diameter of a first section being larger than the inner diameter of a second section, the second sections forming reduced diameter zones; providing a plurality of cam elements, each cam element including an axial opening; inserting the hollow tube into the cam elements, each cam element being positioned about a reduced diameter zone; expanding the reduced diameter zones of the hollow tube into mechanical interference engagement with the cam elements.
Claim 8
Independent Claim
283 words
A method of making a camshaft comprising the steps of: providing a hollow tube; providing a retractable mandrel, the retractable mandrel having a first portion and a second portion adjacent the first portion, the diameter of the first portion being larger than the diameter of the second portion; inserting the retractable mandrel into the hollow tube; mechanically reducing a first section of the hollow tube, the first portion of the retractable mandrel being positioned under the section of the hollow tube being reduced; positioning the second portion of the retractable mandrel under a second section of the hollow tube; mechanically reducing the second section of the hollow tube, the second portion of the retractable mandrel being positioned under the section of the hollow tube being reduced; repeating the steps of mechanically reducing a first section of the hollow tube, the first portion of the retractable mandrel being positioned under the section of the hollow tube being reduced; positioning the second portion of the retractable mandrel under a second section of the hollow tube; and mechanically reducing the second section of the hollow tube, the second portion of the retractable mandrel being positioned under the section of the hollow tube being reduced, thereby forming a plurality of first sections and second sections, the inner diameter of a first section being larger than the inner diameter of a second section, the second sections forming reduced diameter zones; providing a plurality of cam elements, each cam element including an axial opening; inserting the hollow tube into the cam elements, each cam element being positioned about a reduced diameter zone; expanding the reduced diameter zones of the hollow tube into mechanical interference engagement with the cam elements.
Claim 9
Dependent Claim
38 words
The method of claim 5 wherein the areas of the hollow tube adjacent the reduced diameter zones define larger diameter zones and the larger diameter zones do not expand during the step of expanding the reduced diameter zones.
Claim 10
Dependent Claim
67 words
The method of claim 5, further comprising: providing an expander tool having a diameter larger than the inner diameter of the thicker wall zones and smaller than the inner diameter of the thinner wall zones; and using the expander tool to expanding the thicker wall zones of the hollow tube into mechanical interference engagement with the cam elements by inserting the expander tool into the hollow tube.
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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) | 1997-08-15 | 1998-02-14 | 1998-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-15 | 2002-02-14 | 2002-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-15 | 2006-02-14 | 2006-08-16 | $7700.00 | Window Closed / Lapsed |