US3782436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clinch stud
Assignee: Individual
•
Filing: 1972-07-21
•
Granted: 1974-01-01
•
Expires: 1992-07-21
Abstract
Abstract A self-clinching stud has a head and a threaded shank adapted to be secured in sheet material. In the locality integrally adjoining the head and shank, stepped concave lands alternate circumferentially with convex unstepped lands. This configuration produces a flow in sheet metal, when the stud is pressed into a hole having a diameter about equal to the shank diameter and less than that of the lands, that holds the stud against unscrewing as well as axial pull out.
Inventors
- 👤 J Steiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:18
CPC Classifications
F; F16; F16B; F16B37/00; F16B37/04; F16B37/06; F16B37/062; F16B37/068; F16B35/00; F16B35/04; F16B35/06; Y; Y10; Y10S; Y10S411/00; Y10S411/955; Y10S411/965; Y10S411/968
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
A self-clinching stud having a head, a threaded stem, and an integral collar portion coaxially adjoining the stem and an undersurface of the head, said collar portion comprising a plurality of cIrcumferential sectors respectively including an outer concave land adjacent to the head and stepped down to provide an inner concave land, extremities of said concave collar lands respectively extending to convex collar surfaces the diameter of which is less than that of said head and greater than that of the outisde diameter of the threaded stem.
Claim 2
Dependent Claim
87 words
A self-clinching stud having a head, a threaded stem, and an integral collar portion coaxially adjoining the stem and an undersurface of the head, said collar portion comprising a plurality of cIrcumferential sectors respectively including an outer concave land adjacent to the head and stepped down to provide an inner concave land, extremities of said concave collar lands respectively extending to convex collar surfaces the diameter of which is less than that of said head and greater than that of the outisde diameter of the threaded stem.
Claim 3
Dependent Claim
18 words
A stud as in claim 1 wherein the sectors between midpoints of the successive concave lands are quadrants.
Claim 4
Dependent Claim
33 words
A stud as in claim 1 wherein the axial thickness of the outer concave land sector plus that of the inner concave land sector substantially equals the axial thickness of said collar surfaces,
Claim 5
Dependent Claim
32 words
A stud as in claim 1 wherein said convex collar surfaces are cylindrical, and the underside of the concave lands intersects the adjacent inner concave lands at an angle of about 90*.
Claim 6
Dependent Claim
79 words
A stud as set forth in claim 3 further characterized in that the circumferential proportions of the four convex surface portions to the concave lands is such as to provide displaced material from the wall of a hole in which the stud stem is axially thrust, which material substantially corresponds in volume to that of the groove of an adjacent stem end threads plus the volume of the four cavities defined by said concave lands with said end threads.
References Cited (Backward Citations)
US3127919A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |