Method and apparatus for making self-locking internally threaded fasteners
Abstract
Abstract Method and apparatus for making self-locking internally threaded fasteners in which the self-locking characteristic is derived from a free-form plastic patch of limited axial and circumferential extent adhered to the thread-defining surface of each such fastener by establishing a deposit of plastic powder upon the thread-defining surface of the fastener with the longitudinal boundaries of the deposit space axially from both ends of the surface and heating the fastener to fuse the powder deposit and establish a patch adhered to the thread-defining surface. The fasteners are each seated upon a pin having a cavity-forming portion such that a cavity is established between the pin and the fastener thereon and the deposit of plastic powder is placed within the cavity. An excess amount of plastic powder is deposited within the cavity and unwanted powder is subsequently removed from at least one end of the deposit to establish a longitudinal boundary spaced from the corresponding end of the thread-defining surface.
Inventors
- 👤 G Barnes
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |