US4023914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locking thread forming tap
Assignee: Individual
•
Filing: 1976-01-15
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Granted: 1977-05-17
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Expires: 1996-01-15
Abstract
Abstract A thread forming tap comprising a shank section, a body section extending longitudinally from the shank section, a helical thread formed on the body section and having radially converging flank portions which define an inclined ramp area arranged at a preselected angle to the axis of the tap and adapted to form a complementary inclined ramp at the root of the thread to be formed by the tap.
Inventors
- 👤 Horace D. Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:21
CPC Classifications
B; B23; B23G; B23G5/00; B23G5/02; B23G5/06; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/904; Y10T408/9046; Y10T408/90467
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
118 words
A thread forming tap comprising a shank section, a body section extending longitudinally from the shank section, a helical thread formed on the body section and having radially converging flank portions, an inclined ramp area formed at the end of said flank portions and arranged at a preselected angle to the axis of the tap and adapted to form a complementary inclined ramp at the root of the thread to be formed by the tap, said thread formed on said body section being of uniform cross-sectional shape for substantially the entire axial length of said body section, and each of said ramp areas being formed at approximately the same angle of inclination from the axis of said tap.
Claim 2
Dependent Claim
118 words
A thread forming tap comprising a shank section, a body section extending longitudinally from the shank section, a helical thread formed on the body section and having radially converging flank portions, an inclined ramp area formed at the end of said flank portions and arranged at a preselected angle to the axis of the tap and adapted to form a complementary inclined ramp at the root of the thread to be formed by the tap, said thread formed on said body section being of uniform cross-sectional shape for substantially the entire axial length of said body section, and each of said ramp areas being formed at approximately the same angle of inclination from the axis of said tap.
Claim 3
Dependent Claim
20 words
The tap as set forth in claim 1 wherein said body is formed with circumferentially spaced longitudinally extending relieved areas.
Claim 4
Dependent Claim
26 words
The tap as set forth in claim 1 wherein the end of said body opposite said shank section is formed with a reduced diameter pilot portion.
Claim 5
Dependent Claim
17 words
The tap as set forth in claim 1 wherein said preselected angle is between 15° and 35°.
Claim 6
Dependent Claim
60 words
The tap as set forth in claim 1 wherein said preselected angle is an angle whose tangent is equal to approximately one-half the maximum standard manufacturing tolerances between the inner periphery of the bore formed by said tap and the outer periphery of a threaded element to be received within said bore in an axial distance of approximately 0.020 inches.
Claim 7
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 3/8 inch in diameter, has 16 threads per inch of class 1 type, and wherein said preselected angle is 23.5 ± 0.5°.
Claim 8
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 3/8 inch in diameter, has 16 threads per inch of class 2 type, and wherein said preselected angle is 17.6 ± 0.5°.
Claim 9
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 3/8 inch in diameter, has 16 threads per inch of class 3 type, and wherein said preselected angle is 15.9 ± 0.5°.
Claim 10
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 7/16 inch in diameter, has 14 threads per inch of class 1 type, and wherein said preselected angle is 25.2 ± 0.5°.
Claim 11
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 7/16 inch in diameter, has 14 threads per inch of class 2 type, and wherein said preselected angle is 18.9 ± 0.5°.
Claim 12
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 7/16 inch in diameter, has 14 threads per inch of class 3 type, and wherein said preselected angle is 17.0 ± 0.5°.
Claim 13
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 1/2 inch in diameter, has 13 threads per inch of class 1 type, and wherein said preselected angle is 26.3 ± 0.5°.
Claim 14
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 1/2 inch in diameter, has 13 threads per inch of class 2 type, and wherein said preselected angle is 19.7 ± 0.5°.
Claim 15
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 1/2 inch in diameter, has 13 threads per inch of class 3 type, and wherein said preselected angle is 17.8 ± 0.5°.
Claim 16
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 9/16 inch in diameter, has 12 threads per inch of class 1 type, and wherein said preselected angle is 27.4 ± 0.5°.
Claim 17
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 9/16 inch in diameter, has 12 threads per inch of class 2 type, and wherein said preselected angle is 20.5 ± 0.5°.
Claim 18
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 9/16 inch in diameter, has 12 threads per inch of class 3 type, and wherein said preselected angle is 18.5 ± 0.5°.
Claim 19
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 5/8 inch in diameter, has 11 threads per inch of class 1 type, and wherein said preselected angle is 28.5 ± 0.5°.
Claim 20
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 5/8 inch in diameter, has 11 threads per inch of class 2 type, and wherein said preselected angle is 21.4 ± 0.5°.
Claim 21
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 5/8 inch in diameter, has 11 threads per inch of class 3 type, and wherein said preselected angle is 19.4 ± 0.5°.
Claim 22
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 11/16 inch in diameter, has 12 threads per inch of class 2 type, and wherein said preselected angle is 20.5 ± 0.5°.
Claim 23
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 11/16 inch in diameter, has 12 threads per inch of class 3 type, and wherein said preselected angle is 18.5 ± 0.5°.
Claim 24
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 3/4 inch in diameter, has 10 threads per inch of class 1 type, and wherein said preselected angle is 30.1 ± 0.5°.
Claim 25
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 3/4 inch in diameter, has 10 threads per inch of class 2 type, and wherein said preselected angle is 22.6 ± 0.5°.
Claim 26
Dependent Claim
39 words
The tap as set forth in claim 5 wherein said helical thread on said body section is 3/4 inch in diameter, has 10 threads per inch of class 3 type, and wherein said preselected angle is 20.4 ± 0.5°.
Claim 27
Dependent Claim
107 words
A thread forming tool, said tool including a body section having a helical thread formed thereon, said thread having radially converging flank portions, an inclined ramp area formed at the end of said flank portions and arranged at a preselected angle to the axis of the tool and adapted to form a complementary inclined ramp on the thread to be formed by the tool, said thread formed on said body section being of uniform cross-sectional shape for substantially the entire axial length of said body section, and each of said ramp areas being formed at approximately the same angle of inclination from the axis of said tool.
Claim 28
Dependent Claim
107 words
A thread forming tool, said tool including a body section having a helical thread formed thereon, said thread having radially converging flank portions, an inclined ramp area formed at the end of said flank portions and arranged at a preselected angle to the axis of the tool and adapted to form a complementary inclined ramp on the thread to be formed by the tool, said thread formed on said body section being of uniform cross-sectional shape for substantially the entire axial length of said body section, and each of said ramp areas being formed at approximately the same angle of inclination from the axis of said tool.
Claim 29
Dependent Claim
26 words
A thread forming tool as set forth in claim 26 wherein said body comprises an elongated member having said thread formed on the outer periphery thereof.
Claim 30
Dependent Claim
20 words
The tool as set forth in claim 27 wherein said body is formed with circumferentially spaced longitudinally extending relieved areas.
Claim 31
Dependent Claim
26 words
The tool as set forth in claim 27 wherein the end of said body opposite said shank section is formed with a reduced diameter pilot portion.
Claim 32
Dependent Claim
19 words
The tool as set forth in claim 27 wherein said ramp area is inclined at an angle between 15°-35°.
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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |