Patent US3791750A successfully refreshed from Google Patents.
US3791750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dowel
Assignee: Individual
•
Filing: 1972-05-15
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Granted: 1974-02-12
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Expires: 1992-05-15
Abstract
Abstract A dowel pin is formed by extruding hot plastic through a cooled die plate to form a cylindrical structure having on its surface a multiplicity of thin resilient fins most of which are disposed transversely to the longitudinal axis of the cylinder. The fins not only provide a roughened surface for better adhesion when combined in a joint with a suitable glue, but also exhibit plastic memory causing them to thrust against the wall of the bore in which the dowel is inserted, in order to effect a permanent joint. In one form the dowel is shaped with an hourglass cross-section so that it may be inserted into a pair of overlapping bores and thereby provide greatly improved resistance to rotational forces.
Inventors
- 👤 H Cameron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:26
CPC Classifications
F; F16; F16B; F16B13/00; F16B13/14; F16B13/141; E; E04; E04B; E04B1/00; E04B1/38; E04B1/48; Y; Y10; Y10T; Y10T403/00; Y10T403/55; Y10T403/557
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A dowel comprising a cylindrical rod of constant diameter formed of firm resilient plastic material, said material comprising polyvinyl chloride, a plasticizer and a filler, and a multiplicity of thin, randomly disbursed, resilient upright fins extending radially outwardly from said rod at a uniform heighth, said rod and fins being formed from a single piece of said plastic material, said fins extending from and over the entire periphery and length of the rod and presenting a roughened surface over the entire peripheral surface of the rod, the majority of said fins being disposed transversely to the long axis of the rod, said resilient fins having plastic memory, so that when they are flattened when the rod is driven into a bore they tend to resume their normal upright position and exert thrust radially against the wall of the bore.
Claim 2
Dependent Claim
139 words
A dowel comprising a cylindrical rod of constant diameter formed of firm resilient plastic material, said material comprising polyvinyl chloride, a plasticizer and a filler, and a multiplicity of thin, randomly disbursed, resilient upright fins extending radially outwardly from said rod at a uniform heighth, said rod and fins being formed from a single piece of said plastic material, said fins extending from and over the entire periphery and length of the rod and presenting a roughened surface over the entire peripheral surface of the rod, the majority of said fins being disposed transversely to the long axis of the rod, said resilient fins having plastic memory, so that when they are flattened when the rod is driven into a bore they tend to resume their normal upright position and exert thrust radially against the wall of the bore.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |