US3945069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Threading taps
Assignee: CECIL ROBERT J
•
Filing: 1974-06-21
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Granted: 1976-03-23
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Expires: 1994-06-21
Abstract
Abstract A threading tap, having the usual longitudinally extending flutes to provide lands therebetween. Each land is provided with screw-cutting teeth, and each land has at least one cross-groove formed therein of a length equal to at least two teeth and of a depth greater than the root depth of adjoining teeth. A cross-groove in one land is longitudinally off-set from a cross-groove in an adjoining land to provide for chip clearance and yet not materially weaken the structure of the tap.
Inventors
- 👤 Robert J. Cecil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:28
CPC Classifications
B; B23; B23G; B23G5/00; B23G5/02; B23G5/06; B23G2200/00; B23G2200/34; Y; Y10; Y10T; Y10T408/00; Y10T408/21; Y10T408/89; Y10T408/904; Y10T408/9046; Y10T408/9048; Y10T408/909; Y10T408/9095
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
119 words
A threading tap capable of continuous forward threading movement without intermediate backing-off, said tap having a plurality of longitudinally extending flutes forming a plurality of longitudinally extending lands therebetween, each of said lands having similar full-shaped thread-cutting teeth formed thereon, and each land having at least one cross-groove formed therein of arcuate shape in a direction longitudinally of the land and of a length equal to at least two teeth and of a depth greater than the root depth of adjoining teeth to thereby establish communication between adjoining flutes, each cross-groove in each land being longitudinally off-set from each cross-grove in an adjoining land to provide for chip clearance and yet not materially weaken the structure of said tap.
Claim 2
Dependent Claim
119 words
A threading tap capable of continuous forward threading movement without intermediate backing-off, said tap having a plurality of longitudinally extending flutes forming a plurality of longitudinally extending lands therebetween, each of said lands having similar full-shaped thread-cutting teeth formed thereon, and each land having at least one cross-groove formed therein of arcuate shape in a direction longitudinally of the land and of a length equal to at least two teeth and of a depth greater than the root depth of adjoining teeth to thereby establish communication between adjoining flutes, each cross-groove in each land being longitudinally off-set from each cross-grove in an adjoining land to provide for chip clearance and yet not materially weaken the structure of said tap.
Claim 3
Dependent Claim
33 words
The construction according to claim 1 wherein a said cross-groove is spaced a predetermined distance from the entering end of said tap to indicate the limit of tap threading for a selected use.
Claim 4
Dependent Claim
29 words
The construction according to claim 2 wherein said cross-groove is of a predetermined length with the longitudinally opposite ends thereof indicating minimum and maximum limits for said tap threading.
Claim 5
Dependent Claim
20 words
The construction according to claim 3 wherein the tap is provided with alphameric indicia at the minimum and maximum limits.
Claim 6
Dependent Claim
23 words
The construction according to claim 1 wherein said tap is a tapered tap with its effective diameter increasing throughout the active length thereof.
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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) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |