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US5035019A
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US
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Cold-forming tap
Assignee: North Attleboro Taps Inc
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Filing: 1990-06-11
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Granted: 1991-07-30
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Expires: 2010-06-11
Abstract
Abstract A cold-forming tap is disclosed with a triangular-shaped body when viewed on end with concentric threads cut into the corners of the triangular-shaped body.
Inventors
- 👤 Maureen E. Dias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 00:33
CPC Classifications
B; B23; B23G; B23G7/00; B23G7/02; B23G5/00; B23G5/02; B23G5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
An improved cold-forming tap for forming threads in a workpiece, comprising: a triangular-shaped tap body having a forward end with tapered threads, said tap body having three flat sides and three adjoining corners, each of said corners having an outer edge, said body having a central axis; and a plurality of concentric threads formed in each of said outer edges of said corners of said triangular-shaped tap body, each of said threads being concentric to the central axis of said tap body and being formed on a radius from said tap's central axis, such threads defining a plurality of lobes at each of said corners of said triangular-shaped tap body, said lobes being configured without any radial relief and having a smaller area of surface engagement than tap lobes embodying radial relief, each of said lobes further defining a plurality of longitudinally-extending narrow lands, each land having a lobe arc width of approximately 9 degrees for contacting and cold forming said threads in said workpiece.
Claim 2
Dependent Claim
165 words
An improved cold-forming tap for forming threads in a workpiece, comprising: a triangular-shaped tap body having a forward end with tapered threads, said tap body having three flat sides and three adjoining corners, each of said corners having an outer edge, said body having a central axis; and a plurality of concentric threads formed in each of said outer edges of said corners of said triangular-shaped tap body, each of said threads being concentric to the central axis of said tap body and being formed on a radius from said tap's central axis, such threads defining a plurality of lobes at each of said corners of said triangular-shaped tap body, said lobes being configured without any radial relief and having a smaller area of surface engagement than tap lobes embodying radial relief, each of said lobes further defining a plurality of longitudinally-extending narrow lands, each land having a lobe arc width of approximately 9 degrees for contacting and cold forming said threads in said workpiece.
References Cited (Backward Citations)
US1912517A
Cited
US3775792A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-29 | 1995-01-28 | 1995-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-29 | 1999-01-28 | 1999-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-29 | 2003-01-28 | 2003-07-30 | $7700.00 | Window Closed / Lapsed |