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US3727254A
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US
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Method of forming an insert bush
Assignee: PSM International PLC
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Filing: 1971-05-05
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Granted: 1973-04-17
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Expires: 1991-05-05
Abstract
Abstract An insert for providing a screw-thread when pressed into soft material includes two rings connected together and having external inclined splines of opposite hand, so that in the pressing operation the two rings are contra-rotated, and can lock together. The insert is made as a one-piece construction, and is divided into two pieces which are fixed together, in a single press movement.
Inventors
- 👤 J Tildesley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:30
CPC Classifications
F; F16; F16B; F16B37/00; F16B37/12; F16B37/122; Y; Y10; Y10S; Y10S411/00; Y10S411/955; Y10S411/965; Y10S411/968
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
174 words
A method of fabricating an insert having a plurality of peripheral bands of teeth which are inclined to the axis of the insert, the teeth of a first band at one end of the insert being of hand opposite to the teeth of a second, adjacent band, wherein the improvement comprises the steps of (a) forming, between the first and second bands, a groove having a substantially frustoconical bottom, with its smallest diameter adjacent to the second band, while forming a shoulder extending from the bottom of the groove adjacent to the first band, and forming a bore extending axially through the first band which has a diameter substantially equal to the largest diameter of the frusto-conical bottom of the groove, and (b) axially compressing the insert and thereby shearing the first band free and compressing the shoulder against the second band to deform the material of the shoulder radially inward against the frusto-conical portion, thus anchoring the first band against axial movement while leaving it free to rotate relative to the second band.
Claim 2
Independent Claim
174 words
A method of fabricating an insert having a plurality of peripheral bands of teeth which are inclined to the axis of the insert, the teeth of a first band at one end of the insert being of hand opposite to the teeth of a second, adjacent band, wherein the improvement comprises the steps of (a) forming, between the first and second bands, a groove having a substantially frustoconical bottom, with its smallest diameter adjacent to the second band, while forming a shoulder extending from the bottom of the groove adjacent to the first band, and forming a bore extending axially through the first band which has a diameter substantially equal to the largest diameter of the frusto-conical bottom of the groove, and (b) axially compressing the insert and thereby shearing the first band free and compressing the shoulder against the second band to deform the material of the shoulder radially inward against the frusto-conical portion, thus anchoring the first band against axial movement while leaving it free to rotate relative to the second band.
Claim 3
Dependent Claim
26 words
A method according to claim 1 wherein the first band of teeth is formed with a diameter greater than that of the second band of teeth.
References Cited (Backward Citations)
US1868415A
Cited
US2520259A
Cited
US2858602A
Cited
US2813568A
Cited
US3037221A
Cited
US3198231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |