US3570361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Groove cutting fastener
Assignee: Individual
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Filing: 1969-04-17
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Granted: 1971-03-16
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Expires: 1989-04-17
Abstract
Abstract A sheet metal nut element for cutting a groove or thread channel on a smooth shank is formed with a plurality of teeth on the peripheral edge of an aperture which receives a shank. The periphery of the aperture is interrupted by breaks or discontinuities and each tooth is formed by an angle at the intersection of the peripheral edge and the edge of a discontinuity. The edge between the discontinuities is deflected axially to lie in a spiral curve and extend radially inwardly of the spiral curve and form teeth that cut a groove in the shank.
Inventors
- 👤 George A Tinnerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:41
CPC Classifications
F; F16; F16B; F16B39/00; F16B39/22; F16B39/28; F16B39/36; F16B37/00; F16B37/002; F16B39/02; F16B39/04; F16B39/06; Y; Y10; Y10S; Y10S411/00; Y10S411/03
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
169 words
A sheet metal, apertured, groove-cutting fastener element having groove-cutting teeth in the aperture which cut a spiral groove formation in a shank upon relative rotation on a shank in said aperture, the periphery of said aperture comprising at least three segments between discontinuities in said periphery, each discontinuity having a side edge extending outwardly from the periphery, each segment having an edge laying in a spiral curve extending from one discontinuity to a tooth at the side edge of the following discontinuity, each said tooth being formed by the intersection at an acute angle of an edge extending inwardly of a continuation of the spiral curve of a spiral edge of a segment with said side edge of a discontinuity to form a sharply pointed tooth directed inwardly of said periphery, said spiral edges being axially deflected out of the plane of the body of said fastener element, So that the fastener element will thread upon a shank as each tooth cuts a spiral groove formation in said shank.
Claim 2
Dependent Claim
169 words
A sheet metal, apertured, groove-cutting fastener element having groove-cutting teeth in the aperture which cut a spiral groove formation in a shank upon relative rotation on a shank in said aperture, the periphery of said aperture comprising at least three segments between discontinuities in said periphery, each discontinuity having a side edge extending outwardly from the periphery, each segment having an edge laying in a spiral curve extending from one discontinuity to a tooth at the side edge of the following discontinuity, each said tooth being formed by the intersection at an acute angle of an edge extending inwardly of a continuation of the spiral curve of a spiral edge of a segment with said side edge of a discontinuity to form a sharply pointed tooth directed inwardly of said periphery, said spiral edges being axially deflected out of the plane of the body of said fastener element, So that the fastener element will thread upon a shank as each tooth cuts a spiral groove formation in said shank.
Claim 3
Dependent Claim
209 words
A sheet metal, apertured, groove-cutting fastener element for threading on to a smooth surface shank by cutting a spiral groove formation in said shank upon relative rotation, comprising a sheet metal fastener element having an aperture therethrough, the periphery of said aperture being interrupted by at least three discontinuities, each discontinuity being formed with an edge extending outwardly from said periphery, said periphery being axially deflected out of the plane of said sheet metal between each two discontinuities to form a spiral edge extending from one discontinuity to a tooth at the outwardly extending edge of the following discontinuity, each said tooth being formed by the intersection at an acute angle of an edge extending inwardly of a continuation of the spiral curve of said spiral edge with said outwardly extending edge of said discontinuity to form a sharp groove-cutting tooth extending inwardly of said periphery with its leading edge engaging the surface of said shank at an acute angle at the point of contact when rotated on said stud and its trailing edge the outwardly directed edge of said discontinuity, successive cutting teeth being spaced axially on a spiral curve an axial distance of one-third of the pitch distance of a single spiral groove cut in said shank.
Claim 4
Dependent Claim
209 words
A sheet metal, apertured, groove-cutting fastener element for threading on to a smooth surface shank by cutting a spiral groove formation in said shank upon relative rotation, comprising a sheet metal fastener element having an aperture therethrough, the periphery of said aperture being interrupted by at least three discontinuities, each discontinuity being formed with an edge extending outwardly from said periphery, said periphery being axially deflected out of the plane of said sheet metal between each two discontinuities to form a spiral edge extending from one discontinuity to a tooth at the outwardly extending edge of the following discontinuity, each said tooth being formed by the intersection at an acute angle of an edge extending inwardly of a continuation of the spiral curve of said spiral edge with said outwardly extending edge of said discontinuity to form a sharp groove-cutting tooth extending inwardly of said periphery with its leading edge engaging the surface of said shank at an acute angle at the point of contact when rotated on said stud and its trailing edge the outwardly directed edge of said discontinuity, successive cutting teeth being spaced axially on a spiral curve an axial distance of one-third of the pitch distance of a single spiral groove cut in said shank.
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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |