US3724315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruding screw
Assignee: ILL WOOL WORKS Inc
•
Filing: 1971-09-07
•
Granted: 1973-04-03
•
Expires: 1991-09-07
Abstract
Abstract The present invention relates generally to threaded fasteners and more particularly to extruding and/or thread-forming screw fasteners for application to sheet metal. An embodiment of the invention disclosed herein includes a shank having a threaded section, a head at one extremity, a pilot section at the opposite extremity in coaxial alignment with the threaded section and a work swaging substantially conical section interposed between the pilot and threaded shank sections. The conical section is positioned out of axial alignment with the threaded and pilot sections.
Inventors
- 👤 H Sygnator
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:55
CPC Classifications
F; F16; F16B; F16B25/00; F16B25/10; F16B25/001; F16B25/0021; F16B25/0036; F16B25/0078; F16B25/106; Y; Y10; Y10S; Y10S411/00; Y10S411/03
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
233 words
An extruding and thread forming screw fastener including a cylindrical shank, a head at one extremity of said shank, and a cylindrical pilot section of smaller diameter than said shank at the opposite entering extremity of said shank in coaxial alignment with the shank section and a work swaging portion interposed between said pilot section and said shank section, the lowermost extremity of the work swaging portion in the vicinity of its juncture with said pilot portion defining a plane at an acute angle to a plane perpendicular to the axis of the shank and pilot of said screw, the work swaging surface diverging upwardly and outwardly in substantially a conical configuration and defining at the juncture with said shank a plane substantially angularly disposed to the axis of said shank in the same direction as the plane at the juncture of the pilot portion and the work swaging surface, said shank provided with threads a portion of which threads extends downwardly toward the entering end into a circumferential segment of said work swaging portion in the vicinity of the portion of said plane nearest the entering end of the screw, a portion of the surface of said work swaging portion opposite said threadeD segment being unthreaded and providing a swaging surface to extrude marginal portions of an aperture in a complementary workpiece into which said screw fastener is adapted to be rotated.
Claim 2
Dependent Claim
233 words
An extruding and thread forming screw fastener including a cylindrical shank, a head at one extremity of said shank, and a cylindrical pilot section of smaller diameter than said shank at the opposite entering extremity of said shank in coaxial alignment with the shank section and a work swaging portion interposed between said pilot section and said shank section, the lowermost extremity of the work swaging portion in the vicinity of its juncture with said pilot portion defining a plane at an acute angle to a plane perpendicular to the axis of the shank and pilot of said screw, the work swaging surface diverging upwardly and outwardly in substantially a conical configuration and defining at the juncture with said shank a plane substantially angularly disposed to the axis of said shank in the same direction as the plane at the juncture of the pilot portion and the work swaging surface, said shank provided with threads a portion of which threads extends downwardly toward the entering end into a circumferential segment of said work swaging portion in the vicinity of the portion of said plane nearest the entering end of the screw, a portion of the surface of said work swaging portion opposite said threadeD segment being unthreaded and providing a swaging surface to extrude marginal portions of an aperture in a complementary workpiece into which said screw fastener is adapted to be rotated.
Claim 3
Dependent Claim
23 words
An extruding and thread-forming screw fastener as set forth in claim 1, wherein the conical section in transverse section is non-circular in shape.
Claim 4
Dependent Claim
57 words
An extruding and thread-forming screw fastener as set forth in claim 1, wherein the conical section in transverse section is generally oval in shape and wherein a longitudinal plane determined by the maximum transverse dimension of the conical section is substantially coincident with the axis of the fastener shank common to the threaded and pilot sections thereof.
Claim 5
Dependent Claim
30 words
An extruding and thread-forming screw fastener as set forth in claim 1 wherein the pilot section comprises a drill point extending axially from the entering extremity of the conical section.
Claim 6
Dependent Claim
39 words
An extruding and thread forming screw fastener as set forth in claim 1, wherein the radial distance from the axis of the screw to circumferential segments located on a transverse plane of the work swaging portion is not constant.
Claim 7
Dependent Claim
45 words
An extruding and thread forming screw fastener in accordance with claim 5, wherein the portion of the cross section of the work swaging section having the least radius coincides with the segment which is of the greatest radial distance from the axis of the screw.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |