US4679323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary nibbler
Assignee: Individual
•
Filing: 1986-03-07
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Granted: 1987-07-14
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Expires: 2006-03-07
Abstract
Abstract A rotary type nibbler comprising a spindle having a helical groove, the spindle being rotatable in a body which terminates in a flat workpiece engagement face which is at an angle with respect to the axis of rotation approximating the helix angle of the groove so that the edge of a workpiece when urged into engagement with the root of the groove will have cut from it a crescent shaped slug.
Inventors
- 👤 Brian A. Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:33
CPC Classifications
B; B23; B23D; B23D27/00; B23D27/02; Y; Y10; Y10S; Y10S83/00; Y10S83/916; Y10T; Y10T83/00; Y10T83/485; Y10T83/869; Y10T83/8789; Y10T83/8796
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
162 words
A rotary nibbler comprising a body, said body having an interior bore defining a generally cylindrical bearing surface having a central axis, a spindle carried in said bore for rotation within said bearing surface of the body about said central axis, a first end of the spindle having a drive engagement surface adjacent one end of the body, a second end of the spindle projecting from the other end of the body and having surfaces defining a helical groove in the side wall of the spindle, one of said groove surfaces defining, with that side wall, a helical cutting edge, said body also having a flat workpiece engagement face which defines, with the axis of rotation, an angle which approximates the helix angle of the groove, said cylindrical bearing surface having an end portion opening to the workpiece engagement face and defining therewith a cutting edge unitary with said body and cooperable with said helical cutting edge upon rotation of the spindle.
Claim 2
Dependent Claim
162 words
A rotary nibbler comprising a body, said body having an interior bore defining a generally cylindrical bearing surface having a central axis, a spindle carried in said bore for rotation within said bearing surface of the body about said central axis, a first end of the spindle having a drive engagement surface adjacent one end of the body, a second end of the spindle projecting from the other end of the body and having surfaces defining a helical groove in the side wall of the spindle, one of said groove surfaces defining, with that side wall, a helical cutting edge, said body also having a flat workpiece engagement face which defines, with the axis of rotation, an angle which approximates the helix angle of the groove, said cylindrical bearing surface having an end portion opening to the workpiece engagement face and defining therewith a cutting edge unitary with said body and cooperable with said helical cutting edge upon rotation of the spindle.
Claim 3
Dependent Claim
22 words
A rotary nibbler according to claim 1 wherein said first end of the spindle projects from said one end of the body.
Claim 4
Dependent Claim
18 words
A rotary nibbler according to claim 1 wherein said helical groove extends around the spindle more than 360°.
Claim 5
Dependent Claim
30 words
A rotary nibbler according to claim 1, wherein said helical groove extends around the spindle between 370° and 425°, and defines a dividing web between overlapping portions of the groove.
Claim 6
Dependent Claim
48 words
A rotary nibbler according to claim 1 wherein said cutting edge on said body extends around the spindle for more than 180° but less than 360°, and terminates at its ends in rebate surfaces between which a slug ejection recess is defined in the side of the body.
Claim 7
Dependent Claim
27 words
A rotary nibbler according to claim 1 wherein said angle defined between the workpiece engagement face and the groove helix angle is less than said helix angle.
Claim 8
Dependent Claim
41 words
A rotary nibbler according to claim 1 wherein the difference between said helix angle, on the one hand, and said angle defined between the work piece engagement face and the groove helix angle, on the other hand, is less than 10°.
Claim 9
Dependent Claim
33 words
A rotary nibbler according to claim 1 wherein said spindle is provided with a shoulder surface within said body, and thrust bearing means between the shoulder surface and an end of said body.
Claim 10
Dependent Claim
56 words
A rotary nibbler according to claim 8 wherein said spindle comprises a radially outstanding annular flange intermediate its ends, said shoulder surface being a surface of said flange, said flange having a second shoulder surface, and said body having an annular radially inwardly directed retaining surface which constrains the spindle against displacement in an axial direction.
Claim 11
Dependent Claim
27 words
A rotary nibbler according to claim 8 wherein said means for fixedly supporting said body comprises, a handle, and pivot means joining said handle to said body.
Claim 12
Dependent Claim
29 words
A rotary nibbler according to claim 1 wherein said spindle second end terminates in converging drill cutting edges flanked by relief surfaces which extend part way along the spindle.
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) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |