US3728927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nibbling punch
Assignee: W A WHITNEY CORP US
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Filing: 1970-10-12
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Granted: 1973-04-24
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Expires: 1990-10-12
Abstract
Abstract A nibbling punch including a body with a downwardly projecting heel around its lower end to embed in the upper portion of a workpiece to prevent lateral sliding of the punch as the latter is driven through the workpiece. In operations where the workpiece is manually indexed relative to the punch, a pilot punch is connected to the nibbling punch to act as a locater and to determine the extent of the next bite made by the nibbling punch.
Inventors
- 👤 G Pfleiderer
- 👤 E Paquet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:32
CPC Classifications
B; B23; B23D; B23D27/00; B21; B21D; B21D28/00; B21D28/24; B21D28/34; Y; Y10; Y10S; Y10S83/00; Y10S83/916; Y10T; Y10T83/00; Y10T83/869; Y10T83/8821; Y10T83/8828; Y10T83/8831; Y10T83/8832; Y10T83/8834; Y10T83/929; Y10T83/9411; Y10T83/9423; Y10T83/9428; Y10T83/9432; Y10T83/9442; Y10T83/9444
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
349 words
A nibbling punch for use with an underlying die and operable on successive downward strokes to nibble out a large hole in an intervening workpiece adapted to be indexed laterally relative to the punch and die after each stroke, said punch comprising an upright body formed with a vertically extending outer wall, a sharp cutting edge formed on the extreme lower end of said wall around the entire outer periphery thereof, a downwardly opening and centrally located recess of inverted dish shape formed in the lower end of said body, said recess being defined by a top wall and by an upwardly extending side wall Having a sharp lower edge spaced inwardly of said cutting edge, a heel defined by the outer wall of said body, the side wall of said recess and a substantially horizontal bottom surface which intersects with said side wall to define said lower edge and with said outer wall to define said cutting edge, said heel projecting downwardly from the top wall of said recess and extending completely around said body and being operable during each downward stroke to bite into and embed in the workpiece to lock the punch against lateral sliding on the workpiece and to keep said cutting edge alined laterally with said die, a pilot punch carried by said body for punching an initial hole in said workpiece and thereafter for locating said workpiece relative to said cutting edge when the workpiece is indexed relative to the nibbling punch, said pilot punch including an upright member connected to and projecting downwardly from the lower end of said body and formed with an outer wall which is shaped similarly to the outer wall of said body and located inwardly of said heel, an upper surface on said member seated against the top wall of said recess to support said member against movement upwardly relative to said body, and a cutting edge formed on the extreme lower end of the outer wall of said member and extending around the entire outer periphery thereof for punching out the initial hole in said workpiece.
Claim 2
Dependent Claim
349 words
A nibbling punch for use with an underlying die and operable on successive downward strokes to nibble out a large hole in an intervening workpiece adapted to be indexed laterally relative to the punch and die after each stroke, said punch comprising an upright body formed with a vertically extending outer wall, a sharp cutting edge formed on the extreme lower end of said wall around the entire outer periphery thereof, a downwardly opening and centrally located recess of inverted dish shape formed in the lower end of said body, said recess being defined by a top wall and by an upwardly extending side wall Having a sharp lower edge spaced inwardly of said cutting edge, a heel defined by the outer wall of said body, the side wall of said recess and a substantially horizontal bottom surface which intersects with said side wall to define said lower edge and with said outer wall to define said cutting edge, said heel projecting downwardly from the top wall of said recess and extending completely around said body and being operable during each downward stroke to bite into and embed in the workpiece to lock the punch against lateral sliding on the workpiece and to keep said cutting edge alined laterally with said die, a pilot punch carried by said body for punching an initial hole in said workpiece and thereafter for locating said workpiece relative to said cutting edge when the workpiece is indexed relative to the nibbling punch, said pilot punch including an upright member connected to and projecting downwardly from the lower end of said body and formed with an outer wall which is shaped similarly to the outer wall of said body and located inwardly of said heel, an upper surface on said member seated against the top wall of said recess to support said member against movement upwardly relative to said body, and a cutting edge formed on the extreme lower end of the outer wall of said member and extending around the entire outer periphery thereof for punching out the initial hole in said workpiece.
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |