Patent US4697969A successfully refreshed from Google Patents.
US4697969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wood screw
Assignee: Individual
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Filing: 1985-09-06
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Granted: 1987-10-06
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Expires: 2005-09-06
Abstract
Abstract An improved wood screw which is self drilling. The wood screw has a first spiral flute that extends essentially the full length of the screw. The screw also has a second spiral flute which begins at the point of the screw and which terminates a short distance from the point.
Inventors
- 👤 Wilford S. Sparkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:47
CPC Classifications
F; F16; F16B; F16B25/00; F16B25/10; F16B25/103; F16B25/001; F16B25/0015; F16B25/0036; F16B25/0042; F16B25/0057; F16B25/0063; F16B25/0078
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
137 words
An improved wood screw of the type having a head, a shank, a root, a point and threads spiralled about the root, said screw having exceptionally easy starting and insertion of the screw in wood wherein the improvement comprises: a first spiral flute beginning at the point of the screw and passing essentially the full length of the screw; and a second spiral flute beginning at the point of the screw and terminating a short distance from the tip and having about the same shape at the point as the first spiral flute so that the tip is symmetrical about a bisector whereby the tip of the flute acts as a drill point retaining partial threads, and the first spiral flute carries wood dust out of the hole which is drilled by the turning of the screw.
Claim 2
Dependent Claim
137 words
An improved wood screw of the type having a head, a shank, a root, a point and threads spiralled about the root, said screw having exceptionally easy starting and insertion of the screw in wood wherein the improvement comprises: a first spiral flute beginning at the point of the screw and passing essentially the full length of the screw; and a second spiral flute beginning at the point of the screw and terminating a short distance from the tip and having about the same shape at the point as the first spiral flute so that the tip is symmetrical about a bisector whereby the tip of the flute acts as a drill point retaining partial threads, and the first spiral flute carries wood dust out of the hole which is drilled by the turning of the screw.
Claim 3
Dependent Claim
27 words
The improved wood screw of claim 1 wherein said first spiral flute is generally semi-circular with respect to the root of said screw when viewed in cross-section.
Claim 4
Dependent Claim
24 words
The improved wood screw of claim 2 wherein the depth of said generally semi-circular flute is about one-third of the diameter of the root.
Claim 5
Dependent Claim
34 words
The improved wood screw of claim 1 wherein a tangent to the central axis of said first spiral forms an angle of about thirty degrees with respect to the central axis of the screw.
Claim 6
Dependent Claim
15 words
The improved wood screw of claim 1 wherein said screw is a flat head screw.
Claim 7
Dependent Claim
24 words
The improved wood screw of claim 5 further including a plurality of cutting surfaces formed by indentations formed on the base of the head.
Claim 8
Dependent Claim
13 words
The improved wood screw of claim 6 wherein there are three such indentations.
Claim 9
Dependent Claim
15 words
The improved wood screw of claim 1 wherein said screw is a hex head screw.
Claim 10
Dependent Claim
22 words
The improved wood screw of claim 1 wherein said second spiral flute extends toward the head a distance of about three threads.
Claim 11
Dependent Claim
15 words
The improved wood screw of claim 1 wherein said screw is a phillips head 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) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |