US5222847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tap
Assignee: IZUMO INDUSTRIAL Co Ltd
•
Filing: 1991-08-29
•
Granted: 1993-06-29
•
Expires: 2011-08-29
Abstract
Abstract A tap having a main body having a crest, a heel, and an outer circumference is disclosed. The tap main body has a male screw part at the crest side. At this male screw part, a plurality of grooves opening to the crest and the outer circumference of tap main body is formed. A tap main body has a cutting edge at each ridge part defined by a wall of said plurality of grooves and an outer circumference of a male screw part. These cutting edges each have a crest part and a heel part. The crest part of at least one cutting edge has an axial rake angle which differs from an axial rake angle of the crest part of another cutting edge.
Inventors
- 👤 Nobuo Hiyama
- 👤 Yoshiharu Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:37
CPC Classifications
B; B23; B23G; B23G5/00; B23G5/02; B23G5/06; B23G2200/00; B23G2200/48; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/904; Y10T408/9048
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
119 words
A tap comprising a tap main body; said tap main body having a male screw portion located on a distal end of said tap main body; said tap having a longitudinal axis extending through a center line of said tap; said male screw portion having a plurality of spiral grooves and spiral lands on an outer circumference of said male screw portion, each of said lands having a cutting face, a heel part, and a crest, each of said cutting faces being at an angle with respect to said longitudinal axis of said tap; wherein the angle of at least one of said cutting faces is different than the angle of at least one of said other cutting faces.
Claim 2
Dependent Claim
119 words
A tap comprising a tap main body; said tap main body having a male screw portion located on a distal end of said tap main body; said tap having a longitudinal axis extending through a center line of said tap; said male screw portion having a plurality of spiral grooves and spiral lands on an outer circumference of said male screw portion, each of said lands having a cutting face, a heel part, and a crest, each of said cutting faces being at an angle with respect to said longitudinal axis of said tap; wherein the angle of at least one of said cutting faces is different than the angle of at least one of said other cutting faces.
Claim 3
Dependent Claim
37 words
A tap according to claim 1 wherein the absolute difference between two said angles which a cutting face of a land makes with the longitudinal axis of the tap is in the range of 1° to 15°.
Claim 4
Dependent Claim
33 words
A tap according to claim 1 wherein all said cutting faces spiral from each of said crest parts to each of said heel parts following said outer circumference of said tap main body.
Claim 5
Dependent Claim
15 words
A tap according to claim 3 wherein each of said angles has a different value.
Claim 6
Dependent Claim
44 words
A tap according to claim 3 wherein said cutting faces are arranged such that said cutting edges are disposed at varying circumferential distances from one another along said tap main body in a plane orthogonal to the longitudinal axis of said tap main body.
Claim 7
Dependent Claim
17 words
A tap according to claim 5 wherein said plane is between either end of said cutting faces.
Claim 8
Dependent Claim
18 words
A tap according to claim 5 wherein said plane is at said crest part of said cutting faces.
Claim 9
Dependent Claim
18 words
A tap according to claim 5 wherein said plane is at said heel part of said cutting faces.
Claim 10
Dependent Claim
33 words
A tap according to claim 5 wherein said plane is at a position between 1/3 and 2/3 of the entire length of said cutting edge from the crest part of said cutting edge.
Claim 11
Dependent Claim
148 words
A tap comprising a tap main body; said tap main body having a male screw portion located on a distal end of tap main body; said tap having a longitudinal axis extending through a center line of said tap; said male screw portion having a plurality of grooves and lands on an outer circumference of said male screw portion, each of said lands having a cutting face, a heel part, and a crest, each said cutting faces being at an angle with respect to said longitudinal axis of said tap; said cutting faces being spiral cutting faces, said outer circumference of said tap at each of said crest part and said cutting edges being straight cutting edges at said heel part thereof; and wherein the angle of at least one of said cutting faces is different than the angle of at least one of said other cutting faces.
Claim 12
Dependent Claim
148 words
A tap comprising a tap main body; said tap main body having a male screw portion located on a distal end of tap main body; said tap having a longitudinal axis extending through a center line of said tap; said male screw portion having a plurality of grooves and lands on an outer circumference of said male screw portion, each of said lands having a cutting face, a heel part, and a crest, each said cutting faces being at an angle with respect to said longitudinal axis of said tap; said cutting faces being spiral cutting faces, said outer circumference of said tap at each of said crest part and said cutting edges being straight cutting edges at said heel part thereof; and wherein the angle of at least one of said cutting faces is different than the angle of at least one of said other cutting faces.
Claim 13
Dependent Claim
22 words
A tap according to claim 10 wherein at least one of said angles of said spiral cutting faces has a different value.
Claim 14
Dependent Claim
46 words
A tap according to claim 10 wherein said spiral cutting faces are arranged such that said spiral cutting faces are disposed at varying circumferential distances from one another along said tap main body in a plane orthogonal to the longitudinal axis of said tap main body.
Claim 15
Dependent Claim
18 words
A tap according to claim 12 wherein said plane is between the ends of said spiral cutting faces.
Claim 16
Dependent Claim
19 words
A tap according to claim 12 wherein said plane is at said crest part of the spiral cutting faces.
Claim 17
Dependent Claim
19 words
A tap according to claim 12 wherein said plane is in said heel part of the spiral cutting faces.
Claim 18
Dependent Claim
30 words
A tap according to claim 12 wherein said plane is positioned in one-half of the entire length of said spiral cutting faces from said crest part of said cutting face.
Claim 19
Dependent Claim
156 words
A tap comprising a tap main body; said tap main body having a male screw portion located on as distal end of tap main body; said tap having a longitudinal axis extending through a center line of said tap; said male screw portion having a plurality of grooves and lands positioned on an outer circumference of said male screw portion, each of said lands having a cutting face, a heel part, a crest part, each of said cutting faces being at an angle with respect to said longitudinal axis of said tap; wherein all cutting faces being slanted cutting edges slanted with respect to the longitudinal axis of said tap at each of said crest part and said cutting faces being straight cutting edges of said heel part thereof; and wherein the angle of at least one of said cutting faces is different than the remaining angle of at least one of said other cutting faces.
Claim 20
Dependent Claim
156 words
A tap comprising a tap main body; said tap main body having a male screw portion located on as distal end of tap main body; said tap having a longitudinal axis extending through a center line of said tap; said male screw portion having a plurality of grooves and lands positioned on an outer circumference of said male screw portion, each of said lands having a cutting face, a heel part, a crest part, each of said cutting faces being at an angle with respect to said longitudinal axis of said tap; wherein all cutting faces being slanted cutting edges slanted with respect to the longitudinal axis of said tap at each of said crest part and said cutting faces being straight cutting edges of said heel part thereof; and wherein the angle of at least one of said cutting faces is different than the remaining angle of at least one of said other cutting faces.
Claim 21
Dependent Claim
20 words
A tap according to claim 17 wherein each of said angles of said slanted cutting face has a different value.
Claim 22
Dependent Claim
61 words
The tap of claim 10 wherein said plurality of cutting faces includes a first cutting face, a second cutting face, and a third cutting face; and said angle of said first cutting face is less than said angle of said second cutting face; and said angle of said second cutting face is less than said angle of said third cutting face.
Claim 23
Dependent Claim
73 words
The tap of claim 1 wherein said plurality of cutting faces includes a first cutting face, a second cutting face and a third cutting face; and said angle of said land of said first cutting face is less than said angle of said land of said second cutting face; and said angle of said land of said second cutting face is less than said angle of said land of said third cutting face.
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) | 1996-06-28 | 1996-12-28 | 1997-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-28 | 2000-12-28 | 2001-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-28 | 2004-12-28 | 2005-06-29 | $7700.00 | Window Closed / Lapsed |