Claims
- 1. 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.
- 2. A tap according to claim 1, wherein the relief clearance angles vary along the entire length of the cutting portion.
- 3. A tap according to claim 1 or 2, wherein the relief clearance angles vary from 5 minutes to 2.degree..
Priority Claims (1)
Number |
Date |
Country |
Kind |
4001481 |
Jan 1990 |
DEX |
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Parent Case Info
This is a continuation of application Ser. No. 07/638,625, filed Jan. 8, 1991, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
1845063 |
Trbojevich |
Feb 1932 |
|
Foreign Referenced Citations (3)
Number |
Date |
Country |
589096 |
Jan 1978 |
SUX |
1060365 |
Dec 1983 |
SUX |
1328094 |
Aug 1987 |
SUX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
638625 |
Jan 1991 |
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