Patent US373580A successfully refreshed from Google Patents.
Patent US3665801A successfully refreshed from Google Patents.
US3665801A
Expired / Lapsed
US
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Drill screw
Assignee: Textron Inc
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Filing: 1970-08-25
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Granted: 1972-05-30
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Expires: 1990-08-25
Abstract
Abstract The drill screw comprises a drill tip, a threaded shank and a head. The drill tip is in two sections, the first of which is a pyramidal shaped entry section, and the second of which is a trailing section having a diameter less than the major diameter of the first section. The major diameter of the entry section is generally larger than or equal to the pitch diameter of the threaded section or where the major diameter of the entry section is smaller than the pitch diameter of the threads, a convolutely fluted section having a major diameter greater than the major diameter of the entry section but less than the major diameter of the threads is positioned adjacent the trailing section of the drill tip and intermediate the drill tip and the threads.
Inventors
- 👤 Charles E Gutshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:24
CPC Classifications
F; F16; F16B; F16B25/00; F16B25/10; F16B25/103; F16B25/001; F16B25/0031; F16B25/0036; F16B25/0042; F16B25/0057; F16B25/0084; F16B25/0089; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/909; Y10T408/9095; Y10T408/9097
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
102 words
A drill screw comprising a drill tip, a shank with threads and a head, said drill tip having a substantially pyramidal entry section terminating in a generally cylindrical portion with a major diameter at least equal to the pitch diameter of the threads, and a trailing section adjacent the generally cylindrical portion of the entry section and having a diameter less than the major diameter of the entry section, said drill tip having a helical drilling means extending substantially throughout the axial extent of the entry and trailing sections, said threaded shank extending from the trailing section and terminating in the head.
Claim 2
Dependent Claim
102 words
A drill screw comprising a drill tip, a shank with threads and a head, said drill tip having a substantially pyramidal entry section terminating in a generally cylindrical portion with a major diameter at least equal to the pitch diameter of the threads, and a trailing section adjacent the generally cylindrical portion of the entry section and having a diameter less than the major diameter of the entry section, said drill tip having a helical drilling means extending substantially throughout the axial extent of the entry and trailing sections, said threaded shank extending from the trailing section and terminating in the head.
Claim 3
Dependent Claim
25 words
The drill screw of claim 1 wherein the major diameter of the pyramidal entry section is substantially equal to the major diameter of the threads.
Claim 4
Dependent Claim
32 words
The drill screw of claim 1 wherein the trailing section contains two mutually opposed and outwardly extending wing tips adaptable to have the end portions thereof break off from the remaining balance.
Claim 5
Dependent Claim
100 words
A drill screw comprising a drill tip, a shank with threads terminating in a head and a convolutely fluted section intermediate the shank and drill tip, said drill tip having a substantially pyramidal entry section with a major diameter less than the minor diameter of the threads, a trailing section having a diameter less than the major diameter of the entry section and a helical drilling means extending along the entry and trailing sections, said convolutely fluted section having a major diameter greater than the major diameter of the entry section but less than the major diameter of the threads.
Claim 6
Dependent Claim
100 words
A drill screw comprising a drill tip, a shank with threads terminating in a head and a convolutely fluted section intermediate the shank and drill tip, said drill tip having a substantially pyramidal entry section with a major diameter less than the minor diameter of the threads, a trailing section having a diameter less than the major diameter of the entry section and a helical drilling means extending along the entry and trailing sections, said convolutely fluted section having a major diameter greater than the major diameter of the entry section but less than the major diameter of the threads.
Claim 7
Dependent Claim
44 words
The drill screw of claim 4 wherein the convolutely fluted section terminates in a cylindrical shaft connecting to the threaded shaft and being of smaller diameter than the major diameter of the convolutely fluted section and less than the minor diameter of the threads.
References Cited (Backward Citations)
US470804A
Cited
CA696358A
Cited
US1342201A
Cited
US1698951A
Cited
US3094894A
Cited
US3358548A
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US3463045A
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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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |