US4477217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill and thread forming screw
Assignee: ROCKFORD PRODUCTS ACQUISITION Corp A CORP OF ILLINOIS
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Filing: 1981-06-01
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Granted: 1984-10-16
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Expires: 2001-06-01
Abstract
Abstract A drilling and thread forming screw including a shank portion with a head at one end and a drill point at the other end. The shank includes a threaded portion having a minor diameter and a major diameter. The drill point defines a segment of a cone having a base and a point. The base intersects the shank at the minor diameter of the shank. This screw is adapted to drill into a substrate up to the minor diameter of the shank and then to form female threads in the substrate.
Inventors
- 👤 Jerry Bonacorsi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:14
CPC Classifications
F; F16; F16B; F16B25/00; F16B25/001; F16B25/0031; F16B25/0036; F16B25/0042; F16B25/0047; F16B25/10; F16B25/103
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
145 words
A drill and thread forming screw comprising: an elongated shank terminating at one end in a head and at the other end in a drill point; said shank including a threaded portion having a minor diameter and a major diameter; said drill point defining a segment of a cone having a base and a point wherein said conical segment is slightly less than one-half of the original cone and is defined by a plane parallel to and slightly beyond the longitudinal axis of the screw and also having a cutting edge and spaced therefrom an extruding edge, said cutting edge extending from said other end and terminating at said base; said base intersecting said shank at said minor diameter, wherein said screw is adapted to drill and extrude into a substrate up to said minor diameter and then to form female threads in the substrate.
Claim 2
Dependent Claim
145 words
A drill and thread forming screw comprising: an elongated shank terminating at one end in a head and at the other end in a drill point; said shank including a threaded portion having a minor diameter and a major diameter; said drill point defining a segment of a cone having a base and a point wherein said conical segment is slightly less than one-half of the original cone and is defined by a plane parallel to and slightly beyond the longitudinal axis of the screw and also having a cutting edge and spaced therefrom an extruding edge, said cutting edge extending from said other end and terminating at said base; said base intersecting said shank at said minor diameter, wherein said screw is adapted to drill and extrude into a substrate up to said minor diameter and then to form female threads in the substrate.
Claim 3
Dependent Claim
21 words
A drill and thread forming screw as defined in claim 1, wherein said conical segment has a smooth, unthreaded outer surface.
Claim 4
Dependent Claim
29 words
A drill and thread forming screw as defined in claims 1 or 2 wherein said drill point has a base angle of between about zero degrees and fifteen degrees.
Claim 5
Dependent Claim
43 words
A drill and thread forming screw as defined in claim 1, wherein said extruding edge of said conical segment extrudes substrate material during the drilling of a hole in said substrate, and wherein said screw forms female threads in said extruded substrate material.
References Cited (Backward Citations)
CA696358A
Cited
US2015159A
Cited
US3093028A
Cited
US3221588A
Cited
US3682038A
Cited
US3882756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |