US5127776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tap with relief
Assignee: Emuge Werk Richard Glimpel GmbH and Co KG Fabrik fuer Praezisionswerkzeuge
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Filing: 1991-08-22
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Granted: 1992-07-07
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Expires: 2011-08-22
Abstract
Abstract There is a tap whose thread portion 2 forms a cutting section 5 and a guiding section 6 and is provided on a plurality of adjacent thread teeth of the cutting section 5 with a relief 8. It is desirable that a further machining measure be provided for the tap whereby favorable compromises can be obtained with respect to guidance and friction. This is achieved in that the relief 8 of the adjacent cutting-section 5 thread teeth--seen in a longitudinal direction--have a clearance angle which varies increasingly or decreasingly. Varying the relief enables the requirements with respect to avoiding incorrect tapping and avoiding friction-generated cold welding to be met and matched up in an improved manner.
Inventors
- 👤 Helmut Glimpel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:42
CPC Classifications
B; B23; B23G; B23G5/00; B23G5/02; B23G5/06; B23G2210/00; B23G2210/12; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/904; Y10T408/9046; Y10T408/90467; Y10T408/9048
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
93 words
A tap having a threaded portion including a toothed cutting portion and a guiding portion, and being essentially cylindrical, the threaded portion having reliefs at several adjacent thread teeth of the cutting portion, the reliefs having clearance angles based upon a cutting portion thread tooth with a maximum flank diameter, the reliefs of adjacent cutting portion thread teeth, viewed in a longitudinal direction, having clearance angles that increase from front to rear, the reliefs of adjacent guiding portion teeth, viewed in a longitudinal direction, having clearance angles that decrease from front to rear.
Claim 2
Dependent Claim
93 words
A tap having a threaded portion including a toothed cutting portion and a guiding portion, and being essentially cylindrical, the threaded portion having reliefs at several adjacent thread teeth of the cutting portion, the reliefs having clearance angles based upon a cutting portion thread tooth with a maximum flank diameter, the reliefs of adjacent cutting portion thread teeth, viewed in a longitudinal direction, having clearance angles that increase from front to rear, the reliefs of adjacent guiding portion teeth, viewed in a longitudinal direction, having clearance angles that decrease from front to rear.
Claim 3
Dependent Claim
20 words
A tap according to claim 1, wherein the relief clearance angles vary along the entire length of the cutting portion.
Claim 4
Dependent Claim
19 words
A tap according to claim 1 or 2, wherein the relief clearance angles vary from 5 minutes to 2°.
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) | 1995-07-07 | 1996-01-06 | 1996-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-07 | 2000-01-06 | 2000-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-07 | 2004-01-06 | 2004-07-07 | $7700.00 | Window Closed / Lapsed |