Patent US5487626A successfully refreshed from Google Patents.
US5487626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Threading tap
Assignee: Sandvik Intellectual Property AB
•
Filing: 1994-09-07
•
Granted: 1996-01-30
•
Expires: 2014-09-07
Abstract
Abstract A threading tap comprises a cylindrical shaft and a threading portion. At least the threading portion comprises a compound material comprising a core of high speed steel or tool steel and a cover of "Coronite"®, i.e., a hard material with 30 to 70% by volume of submicronic hard materials in the form of carbides, nitrides and/or carbonitrides of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and/or W in a metallic matrix based on Fe, Co and/or Ni. The chip surfaces adjacent to the cutting edges of the cutting threads have a negative rake angle. The threading tap has proven to be excellent at the threading of titanium-based alloys.
Inventors
- 👤 Peder von Holst
- 👤 Josef Giessler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:16
CPC Classifications
B; B23; B23G; B23G5/00; B23G5/02; B23G5/06; B23G2225/00; B23G2225/32; B23G2225/44; B23G2225/52; B23G2225/56; B23G2225/60; Y; Y10; Y10T; Y10T408/00; Y10T408/78; Y10T408/89; Y10T408/904; Y10T408/9048
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
139 words
A threading tap comprising an elongate, substantially cylindrical shaft, which at one is provided with two or more lands which are straight or helically twisted around the central axis of the shaft, which lands are provided with cutting threads of substantially equal profiles and which are separated by straight or equally twisted chip-conveying flutes, at least the portion of the threading tap provided with lands comprising a core of high speed steel or tool steel and a cover of a hard material of 30 to 70% by volume of submicronic hard materials of carbides, nitrides and/or carbonitrides of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and/or W in a metallic matrix based on Fe, Co and/or Ni, the chip surfaces adjacent to the cutting edges of the cutting threads having a negative rake angle between -6° and -12°.
Claim 2
Dependent Claim
139 words
A threading tap comprising an elongate, substantially cylindrical shaft, which at one is provided with two or more lands which are straight or helically twisted around the central axis of the shaft, which lands are provided with cutting threads of substantially equal profiles and which are separated by straight or equally twisted chip-conveying flutes, at least the portion of the threading tap provided with lands comprising a core of high speed steel or tool steel and a cover of a hard material of 30 to 70% by volume of submicronic hard materials of carbides, nitrides and/or carbonitrides of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and/or W in a metallic matrix based on Fe, Co and/or Ni, the chip surfaces adjacent to the cutting edges of the cutting threads having a negative rake angle between -6° and -12°.
Claim 3
Dependent Claim
16 words
The threading tap of claim 1 wherein the shaft is provided with 2 to 5 lands.
Claim 4
Dependent Claim
14 words
The threading tap of claim 1 wherein the shaft is provided with 3 lands.
Claim 5
Dependent Claim
29 words
The threading tap of claim 1 wherein at least part of the outer surface of the threading tap is coated with a thin layer of TiN, Ti(C,N) and/or (Ti,Al)N.
Claim 6
Dependent Claim
17 words
Use of the threading tap of claim 1 for threading of holes in titanium and titanium-based alloys.
Claim 7
Dependent Claim
16 words
The threading tap of claim 1 wherein the negative rake angle is between -8° and -10°.
References Cited (Backward Citations)
US2240840A
Cited
US2351827A
Cited
US3328814A
Cited
US4145213A
Cited
EP0122176A2
Cited
US4618540A
Cited
US4708542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-01-29 | 1999-07-31 | 2000-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-29 | 2003-07-31 | 2004-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-29 | 2007-07-31 | 2008-01-30 | $7700.00 | Window Closed / Lapsed |