Patent US4316683A successfully refreshed from Google Patents.
US4316683A
Expired / Lapsed
US
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Semi-circular thread tap
Assignee: Individual
•
Filing: 1981-05-26
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Granted: 1982-02-23
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Expires: 2001-05-26
Abstract
Abstract A tap for cutting threads in a hole which comprises a semi-circular tap body with threads cut in the circular surface extending to a diametrical surface. Modified embodiments include a rake angle at the cutting ends of the tap threads and a drill point to allow the device to serve as a drill and tap.
Inventors
- 👤 Lawrence A. Schott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:33
CPC Classifications
B; B23; B23G; B23G5/00; B23G5/20; B23G2200/00; B23G2200/14; B23G2200/143; B23G2200/146; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/904; Y10T408/9046
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
98 words
In a tap for threading holes in metal: (a) a cylindrical drive section of steel having an ensmalled mount shank at a working end, the drive section and the mount shank having a radial shoulder therebetween, and (b) a half-circle tap segment having a half-circle recess on one side to fit the mount shank and a half-circle threaded surface on the other side to form a tap surface, said tap section having a length extending substantially the length of the ensmalled mount shank, said tap segment being brazed on said mount shank with one end against said shoulder.
Claim 2
Dependent Claim
98 words
In a tap for threading holes in metal: (a) a cylindrical drive section of steel having an ensmalled mount shank at a working end, the drive section and the mount shank having a radial shoulder therebetween, and (b) a half-circle tap segment having a half-circle recess on one side to fit the mount shank and a half-circle threaded surface on the other side to form a tap surface, said tap section having a length extending substantially the length of the ensmalled mount shank, said tap segment being brazed on said mount shank with one end against said shoulder.
Claim 3
Dependent Claim
25 words
A tap as defined in claim 1 in which said mount shank is chamfered at one end to provide chip space in a blind hole.
Claim 4
Dependent Claim
27 words
A tap as defined in claim 1 in which said mount shank is chamfered and recessed at one end to provide chip space in a blind hole.
References Cited (Backward Citations)
US117082A
Cited
US428490A
Cited
US1232099A
Cited
US1908575A
Cited
US2033557A
Cited
US2684492A
Cited
US3336614A
Cited
US4090808A
Cited
US4123194A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-22 | 1985-08-24 | 1986-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-22 | 1989-08-24 | 1990-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-22 | 1993-08-24 | 1994-02-23 | $7700.00 | Window Closed / Lapsed |