US6386954B2
Expired / Lapsed
US
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Thread forming tap and threading method
Assignee: Tanoi Manufacturing Co Ltd
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Filing: 2001-03-09
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Granted: 2002-05-14
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Expires: 2021-03-09
Abstract
Abstract It is an object of the invention to provide a thread-forming tap to which a chamfer can easily be mounted, and a general threading method. The thread forming tap of the invention has a threaded portion comprising a tapered chamfer and a parallel threaded portion which is formed continuously with the chamfer. A depth of root of the chamfer is set equal to that of a root of the parallel threaded portion constantly.
Inventors
- 👤 Teruo Sawabe
- 👤 Isao Yokoyama
- 👤 Kazutoshi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:56
CPC Classifications
B; B23; B23G; B23G5/00; B23G5/02; B23G5/06; B24; B24B; B24B19/00; B24B19/009; B24B19/02; B24B19/022; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/904; Y10T408/9046; Y10T408/9048
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
54 words
A threading method wherein a front flank and a rear flank of a thread are formed while alternately and gradually changing a feeding ratio between a tip end and a rear end of threaded portion and then, a parallel threaded portion is formed and thereafter, an outer diameter portion of the thread is ground.
Claim 2
Dependent Claim
54 words
A threading method wherein a front flank and a rear flank of a thread are formed while alternately and gradually changing a feeding ratio between a tip end and a rear end of threaded portion and then, a parallel threaded portion is formed and thereafter, an outer diameter portion of the thread is ground.
Claim 3
Dependent Claim
86 words
A threading method of a thread forming tap having a threaded portion comprising a tapered chamfer and a parallel threaded portion which is formed continuously with the chamfer, wherein after a parallel portion from the chamfer to the parallel threaded portion is continuously ground, a front flank to a rear flank of the chamfer are ground while alternately and gradually changing a feeding ratio between a tip end and a rear end of the chamfer and then, an outer diameter portion of the chamfer is ground.
Claim 4
Dependent Claim
86 words
A threading method of a thread forming tap having a threaded portion comprising a tapered chamfer and a parallel threaded portion which is formed continuously with the chamfer, wherein after a parallel portion from the chamfer to the parallel threaded portion is continuously ground, a front flank to a rear flank of the chamfer are ground while alternately and gradually changing a feeding ratio between a tip end and a rear end of the chamfer and then, an outer diameter portion of the chamfer is ground.
Claim 5
Dependent Claim
47 words
A thread forming tap having a threaded portion comprising a tapered chamfer and a parallel threaded portion which is formed continuously with the chamfer, wherein a depth of a root of the chamfer is set equal to that of a root of the parallel threaded portion constantly.
Claim 6
Dependent Claim
47 words
A thread forming tap having a threaded portion comprising a tapered chamfer and a parallel threaded portion which is formed continuously with the chamfer, wherein a depth of a root of the chamfer is set equal to that of a root of the parallel threaded portion constantly.
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) | 2005-05-13 | 2005-11-12 | 2006-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-05-13 | 2009-11-12 | 2010-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-05-13 | 2013-11-12 | 2014-05-14 | $7700.00 | Window Closed / Lapsed |