Patent US5797710A successfully refreshed from Google Patents.
US5797710A
Expired / Lapsed
US
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Thread forming tap
Assignee: Tanoi Manufacturing Co Ltd
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Filing: 1996-09-26
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Granted: 1998-08-25
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Expires: 2016-09-26
Abstract
Abstract A tap having a reamer edge which is provided at a chamfer part, so that when the thread forming tap is pulled out after the internal thread is formed, a seam portion present at the crest of the internal thread is cut off, whereby even in a blind hole, formation of internal thread and cutting of the seam portion are performed in a single process, and formation of an internal thread and processing of an inside diameter portion are achieved in a single process to obtain concentricity in line with each other. Further, even if there is a deviation in diameter of the hole before threading, the inside of the internal thread is processed to a constant value.
Inventors
- 👤 Teruo Sawabe
- 👤 Isao Yokoyama
- 👤 Kazutoshi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:58
CPC Classifications
B; B23; B23G; B23G7/00; B23G7/02; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/904; Y10T408/9046; Y10T408/9048
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
87 words
A thread forming tap comprising a plurality of radial portions disposed on an outer peripheral surface of a main body to form a thread part, said radial portions on said main body being configured to plastically deform an inner peripheral surface of a material to form an internal thread when said main body is turned in a first direction, wherein at least one cutting part configured for cutting the crest of the internal thread is formed between radial portions in the peripheral direction of the thread part.
Claim 2
Dependent Claim
87 words
A thread forming tap comprising a plurality of radial portions disposed on an outer peripheral surface of a main body to form a thread part, said radial portions on said main body being configured to plastically deform an inner peripheral surface of a material to form an internal thread when said main body is turned in a first direction, wherein at least one cutting part configured for cutting the crest of the internal thread is formed between radial portions in the peripheral direction of the thread part.
Claim 3
Dependent Claim
91 words
The thread forming tap as claimed in claim 1, wherein said thread part is provided at a tip portion with a chamfer part formed to gradually decrease in diameter as it extends away from the tip of said thread part, said cutting part has an outside diameter nearly equal to an inside diameter of the internal thread, and said cutting part is configured so that the crest of the internal thread is cut off when said main body is turned in a second direction which is opposite to said first direction.
Claim 4
Dependent Claim
54 words
The thread forming tap as claimed in claim 2, wherein a plurality of grooves extending in the axial direction of said main body are formed in the peripheral surface of said main body, and said cutting part is provided at a position of said radial portion between said grooves adjacent to said chamfer part.
Claim 5
Dependent Claim
38 words
The thread forming tap as claimed in claim 2, wherein a root of said chamfer part is formed smaller in depth than the root of said parallel thread portion, and said cutting part is formed at said root.
Claim 6
Dependent Claim
88 words
The thread forming tap as claimed in claim 1, wherein said thread part is provided at the rear end portion with a run off which gradually decreases in diameter towards the rear end, said cutting part has an outside diameter nearly equal to the inside diameter of the internal thread, said cutting part is adjacent said run off and is configured so that when said main body is turned in said first direction, the crest of the internal thread is cut off after the internal thread is formed.
Claim 7
Dependent Claim
38 words
The thread forming tap as claimed in claim 3, wherein a root of said chamfer part is formed smaller in depth than the root of said parallel thread portion, and said cutting part is formed at said root.
Claim 8
Dependent Claim
31 words
The thread forming tap as claimed in claim 1, further comprising a groove formed in said outer peripheral surface of said main body between each adjacent two of said radial portions.
Claim 9
Dependent Claim
25 words
The thread forming tap as claimed in claim 7, wherein said at least one cutting part is located between an adjacent two of said grooves.
Claim 10
Dependent Claim
35 words
The thread forming tap as claimed in claim 1, further comprising a run-off groove between two of said radial portions, wherein said run-off groove has a shallower depth than any one of said radial portions.
Claim 11
Dependent Claim
59 words
The thread forming tap as claimed in claim 9, further comprising a groove formed in said outer peripheral surface of said main body between each adjacent two of said radial portions and on each side of said run off groove, wherein said at least one cutting part is located between said two grooves which are adjacent said run-off groove.
Claim 12
Dependent Claim
23 words
The thread forming tap as claimed in claim 10, wherein said at least one cutting part is axially aligned with said run-off groove.
Claim 13
Dependent Claim
35 words
The thread forming tap as claimed in claim 1, further comprising a run off portion on one edge of said cutting part, wherein said run off portion has a smaller diameter than said cutting part.
Claim 14
Dependent Claim
28 words
The thread forming tap as claimed in claim 2, wherein said cutting part is located between the largest diameter portion of said chamfer part and said thread part.
Claim 15
Dependent Claim
116 words
A thread forming tap comprising: a main body having an outer peripheral surface and a longitudinal axis; a plurality of radial portions disposed on said outer peripheral surface of said main body, wherein each radial portion has a longitudinal axis that is substantially parallel to said longitudinal axis of said main body; a thread-forming section formed on each of said radial portions, said thread forming sections being configured to plastically deform an inner peripheral surface of a material to form an internal thread thereon when said main body is turned in a first direction; a cutting part, configured for cutting the crest of the internal thread, formed within at least one of said thread forming sections.
Claim 16
Dependent Claim
116 words
A thread forming tap comprising: a main body having an outer peripheral surface and a longitudinal axis; a plurality of radial portions disposed on said outer peripheral surface of said main body, wherein each radial portion has a longitudinal axis that is substantially parallel to said longitudinal axis of said main body; a thread-forming section formed on each of said radial portions, said thread forming sections being configured to plastically deform an inner peripheral surface of a material to form an internal thread thereon when said main body is turned in a first direction; a cutting part, configured for cutting the crest of the internal thread, formed within at least one of said thread forming sections.
Claim 17
Dependent Claim
38 words
The thread forming tap as claimed in claim 14, wherein said cutting part is configured to cut the crest of the internal thread when said main body is turned in a second direction opposite to said first direction.
Claim 18
Dependent Claim
40 words
The thread forming tap as claimed in claim 14, wherein said cutting part further comprises a cutting edge portion and a run off portion, wherein said run off portion has a diameter smaller than that of the cutting edge portion.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-08-24 | 2002-02-23 | 2002-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-24 | 2006-02-23 | 2006-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-24 | 2010-02-23 | 2010-08-25 | $7700.00 | Window Closed / Lapsed |