Patent US2359243A successfully refreshed from Google Patents.
US3867751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered blanks
Assignee: Formflo Ltd
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Filing: 1972-10-05
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Granted: 1975-02-25
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Expires: 1992-10-05
Abstract
Abstract The formation of inner and outer bearing rings is described by roll forming to shape a sintered metal blank. The roll forming is found to densify the ring in the bearing areas where high strength is required and also it is surprisingly found that some flow of the metal to give the required final shape can be achieved without fracture of the blank.
Inventors
- 👤 Gordon Sidney Connell
- 👤 Paul Egan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:02
CPC Classifications
B; B21; B21H; B21H1/00; B21H1/06; B21H1/12; F; F16; F16C; F16C33/00; F16C33/30; F16C33/58; F16C33/64; F16C19/00; F16C19/02; F16C19/04; F16C19/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49636; Y10T29/49643; Y10T29/49679; Y10T29/49689
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
55 words
A method of preparing an inner or outer bearing ring comprising the steps of: a. forming a substantially cylindrical sintered powder metal blank having a density of at least 96 percent of the density of the solid metal, and b. roll forming said blank to the shape of said required inner or outer bearing ring.
Claim 2
Independent Claim
55 words
A method of preparing an inner or outer bearing ring comprising the steps of: a. forming a substantially cylindrical sintered powder metal blank having a density of at least 96 percent of the density of the solid metal, and b. roll forming said blank to the shape of said required inner or outer bearing ring.
Claim 3
Dependent Claim
20 words
A method according to claim 1 in which said metal has an elongation factor of not less than 9 percent.
Claim 4
Dependent Claim
19 words
A method according to claim 1 wherein said metal has an elongation factor in the region of 12 percent.
Claim 5
Dependent Claim
23 words
A method according to claim 1 wherein said blank has a density of about 98 percent of the density of the solid metal.
Claim 6
Dependent Claim
19 words
a method according to claim 4 wherein said metal has an elongation factor of not less than 9 percent.
Claim 7
Independent Claim
83 words
A method of preparing a bearing ring comprising: a. compressing and sintering a powdered metal in a mould to a substantially cylindrical blank to a density of at least 96 percent of the density of the solid metal, b. squeezing and rolling said cylindrical blank between profiled forming members so as to initially compact parts of said blank and then cause flow of said compacted metal parts to form one or more annular recesses in said blanks so giving said required bearing ring.
Claim 8
Independent Claim
83 words
A method of preparing a bearing ring comprising: a. compressing and sintering a powdered metal in a mould to a substantially cylindrical blank to a density of at least 96 percent of the density of the solid metal, b. squeezing and rolling said cylindrical blank between profiled forming members so as to initially compact parts of said blank and then cause flow of said compacted metal parts to form one or more annular recesses in said blanks so giving said required bearing ring.
Claim 9
Dependent Claim
24 words
A method according to claim 6 in which said blank has a density of about 98 percent of the density of the solid metal.
Claim 10
Dependent Claim
20 words
A method according to claim 6 in which said metal has an elongation factor of not less than 9 percent.
Claim 11
Dependent Claim
20 words
A method according to claim 8 in which said metal has an elongation factor in the region of 12 percent.
Claim 12
Dependent Claim
19 words
A method according to claim 7 wherein said metal has an elongation factor of not less than 9 percent.
Claim 13
Dependent Claim
86 words
an inner or outer bearing ring manufactured by roll forming a substantially cylindrical blank of sintered powder metal having a density of at least 96 percent of the density of the solid metal, comprising: a cylindrical ring having an annular load bearing recess located on an inner or outer surface thereof, the region of material around said load bearing recess being compressed and densified to a density approaching 100 percent of the density of the solid metal, thereby providing high strength in said load bearing recess.
Claim 14
Dependent Claim
86 words
an inner or outer bearing ring manufactured by roll forming a substantially cylindrical blank of sintered powder metal having a density of at least 96 percent of the density of the solid metal, comprising: a cylindrical ring having an annular load bearing recess located on an inner or outer surface thereof, the region of material around said load bearing recess being compressed and densified to a density approaching 100 percent of the density of the solid metal, thereby providing high strength in said load bearing 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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |