US3667339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction controlled torque fastening
Assignee: Individual
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Filing: 1971-03-30
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Granted: 1972-06-06
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Expires: 1991-03-30
Abstract
Abstract A friction controlled torque threaded fastening which depends upon the static coefficient of friction between contacting surfaces of two parts of the fastening and the normal forces which retain said surfaces in engagement with one another. The two parts comprise an inner section or core having a threaded portion and an outer section or shell. The shell has a cylindrical bore of a diameter less than the diameter of a peripheral surface of circular cross section of the core which is applied to the bore by a shrink fit connection. The shell and core are formed of the same material so that the connection can be accomplished by heating the shell and cooling the core.
Inventors
- 👤 Richard E Dame
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:24
CPC Classifications
F; F16; F16B; F16B31/00; F16B31/02; F16B31/021
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
155 words
A friction controlled torque fastening comprising an inner section or core and an outer section or shell, said core having a threaded part and being provided with a peripheral surface of circular cross section, said shell having a substantially cylindrical bore of a diameter less than the diameter of the peripheral surface and engaging around said peripheral surface to provide a static coefficient of friction between the bore and said surface for limiting the torque which can be applied to the core by the shell, said shell and core being formed of the same material whereby the shell may be thermally expanded and the core thermally contracted for assembling the shell on the core, said core having an enlargement disposed beyond one end of said peripheral surface forming a flange having an inner surface inclined to form an angle greater than 90* with said peripheral surface, spaced from and out of engagement with the shell.
Claim 2
Dependent Claim
155 words
A friction controlled torque fastening comprising an inner section or core and an outer section or shell, said core having a threaded part and being provided with a peripheral surface of circular cross section, said shell having a substantially cylindrical bore of a diameter less than the diameter of the peripheral surface and engaging around said peripheral surface to provide a static coefficient of friction between the bore and said surface for limiting the torque which can be applied to the core by the shell, said shell and core being formed of the same material whereby the shell may be thermally expanded and the core thermally contracted for assembling the shell on the core, said core having an enlargement disposed beyond one end of said peripheral surface forming a flange having an inner surface inclined to form an angle greater than 90* with said peripheral surface, spaced from and out of engagement with the shell.
Claim 3
Dependent Claim
47 words
A fastening as in claim 1, said flange having at least one socket opening through said inner surface, and said shell having a bore extending longitudinally therethrough and capable of being aligned with said socket for receiving a pin for securing the shell non-rotatively to the core.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |