Patent US4042124A successfully refreshed from Google Patents.
Patent US4490082A successfully refreshed from Google Patents.
US4490082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fastener having an axially and radially undulating flange
Assignee: Illinois Tool Works Inc
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Filing: 1983-06-08
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Granted: 1984-12-25
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Expires: 2003-06-08
Abstract
Abstract A screw adapted for use with thin sheet metal. The screw has a threaded shank and a head with an integral flange. The flange has both radial and axial undulations which increase the amount of torque required to strip the screw. The undulations are formed at the outer edge of the flange and on the under surface of the flange and are adapted to engage a workpiece upon threaded advancement of the screw.
Inventors
- 👤 Gerald D. Barth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:31
CPC Classifications
F; F16; F16B; F16B39/00; F16B39/22; F16B39/28; F16B39/282
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
108 words
A screw comprising: a threaded shank, a head at one end of said shank adapted to accommodate a driving tool, said head including an integral flange, radial and axial undulations on said flange, said undulations creating non-abrupt variations in radial and axial profiles of said flange, said variations in axial profiles of said flange defining a recess in said head, said radial and axial undulations occurring with the radial outward peaks and the axial downward peaks at coincident locations on said flange, said undulations adapted to interfere with a workpiece upon threaded advancement of said screw into said workpiece, whereby torque required to strip said screw is increased.
Claim 2
Dependent Claim
108 words
A screw comprising: a threaded shank, a head at one end of said shank adapted to accommodate a driving tool, said head including an integral flange, radial and axial undulations on said flange, said undulations creating non-abrupt variations in radial and axial profiles of said flange, said variations in axial profiles of said flange defining a recess in said head, said radial and axial undulations occurring with the radial outward peaks and the axial downward peaks at coincident locations on said flange, said undulations adapted to interfere with a workpiece upon threaded advancement of said screw into said workpiece, whereby torque required to strip said screw is increased.
Claim 3
Dependent Claim
34 words
A screw in accordance with claim 1 wherein said shank includes a helical ramp adjacent said head, said ramp having generally axially oriented teeth adapted to engage walls of an aperture in said workpiece.
Claim 4
Dependent Claim
13 words
A screw in accordance with claim 1 wherein said flange is generally beveled.
Claim 5
Dependent Claim
19 words
A screw in accordance with claim 1 wherein said head includes six wrenching flats which form a hexagonal configuration.
Claim 6
Dependent Claim
19 words
A screw in accordance with claim 1 wherein said undulations are evenly spaced about the perimeter of said flange.
Claim 7
Dependent Claim
31 words
A screw in accordance with claim 2 wherein said head includes a second recess smaller in diameter than said recess formed by said variations, said ramp extending into said second recess.
Claim 8
Dependent Claim
24 words
A screw in accordance with claim 1 wherein said head includes a second recess smaller in diameter than said recess formed by said variations.
Claim 9
Dependent Claim
40 words
A screw in accordance with claim 1 wherein said flange has an undersurface, said undersurface having an outer portion which lies at an angle of about 10 degrees with respect to a plane perpendicular to the axis of the screw.
Claim 10
Dependent Claim
89 words
A screw in accordance with claim 2 wherein said screw includes a helical thread disposed on said shank, said thread being adapted to engage said workpiece and advance said screw into said workpiece upon rotation of said screw in a first circumferential direction, said teeth being adapted to increase torque required to strip said screw, said teeth each being comprised of a generally radially oriented surface and a generally circumferentially oriented surface, said surfaces converging at a tooth edge, said radially oriented surfaces generally facing said first circumferential direction.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |