Patent US3933071A successfully refreshed from Google Patents.
US3933071A
Expired / Lapsed
US
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Shearproof punch
Assignee: ONONDAGA TOOL CORP
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Filing: 1975-03-27
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Granted: 1976-01-20
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Expires: 1995-03-27
Abstract
Abstract A shearproof or notching or nibbling punch has an upper retainer member adapted to be secured to a press and a punch body. The upper body portion is adapted to be secured to the retainer member by bolt means and the lower body portion is square in cross section and has a substantially semi-cylindrical groove extending vertically along the center of each vertical face of the lower body portion. A heel for each groove has its lower portion flatted along its outer side to conform to the lower body configuration, and each heel has a cylindrical portion extending through a conforming aperture in the upper body portion and terminating in a head. Each head lies in an elongated slot in the upper body top surface, the slot being deeper than the height of the head. Springs lying in holes in the retainer member and extending into each slot bias the heels downward to project beyond the flat bottom surface of the lower body. Each heel head is flatted on diametrically opposite sides to conform its width to that of the slots to keep the heel from turning in its groove.
Inventors
- 👤 Edward J. Doring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:20
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/24; B21D28/34; B23; B23D; B23D27/00; Y; Y10; Y10T; Y10T83/00; Y10T83/869; Y10T83/8821; Y10T83/8841; Y10T83/8853; Y10T83/8855; Y10T83/929; Y10T83/9411; Y10T83/9442; Y10T83/9444
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
230 words
A male shearproof punch having a retainer member adapted to be secured to a press, a unitary punch body having an upper portion removably secured to the retainer member and a lower portion having four vertically extending side surfaces, and four heels, each heel being slidably contained in a vertically extending groove in a lower body side surface and extending upward into the upper body portion, the lower body portion and the heels having flat bottom surfaces the edges therearound defining the punch cutting edge, each heel lower portion having a portion of its outer side surface cut away to conform to the configuration of the adjacent lower body side surface, wherein the improvement comprises a slot in the upper surface of the upper body portion for each heel, each heel having a head flatted on two diametrically opposite sides for sliding contact with the slot sides, each slot being of a greater depth than the heel head height, and each heel being spring-biased downward, whereby rotation of each heel is prevented and each heel is biased downward ahead of the punch body for entering a female die to cooperate with the punch body when not arrested by a workpiece in order to prevent deflection of the punch body and the heels are retractable to align their cutting edges with those of the punch body when arrested by a workpiece.
Claim 2
Dependent Claim
230 words
A male shearproof punch having a retainer member adapted to be secured to a press, a unitary punch body having an upper portion removably secured to the retainer member and a lower portion having four vertically extending side surfaces, and four heels, each heel being slidably contained in a vertically extending groove in a lower body side surface and extending upward into the upper body portion, the lower body portion and the heels having flat bottom surfaces the edges therearound defining the punch cutting edge, each heel lower portion having a portion of its outer side surface cut away to conform to the configuration of the adjacent lower body side surface, wherein the improvement comprises a slot in the upper surface of the upper body portion for each heel, each heel having a head flatted on two diametrically opposite sides for sliding contact with the slot sides, each slot being of a greater depth than the heel head height, and each heel being spring-biased downward, whereby rotation of each heel is prevented and each heel is biased downward ahead of the punch body for entering a female die to cooperate with the punch body when not arrested by a workpiece in order to prevent deflection of the punch body and the heels are retractable to align their cutting edges with those of the punch body when arrested by a workpiece.
Claim 3
Dependent Claim
30 words
The male shearproof punch defined in claim 1 wherein the cutting edge defined by the edges of the lower body portion and the lower portions of the heels is rectangular.
Claim 4
Dependent Claim
33 words
The male shearproof punch defined in claim 1 wherein the cutting edge defined by the edges of the lower body portion and the lower portions of the heels is foursided with arcuate sides.
Claim 5
Dependent Claim
236 words
A male shearproof punch having a retainer member adapted to be secured to a press, a punch body having an upper portion removably secured to the retainer member and a lower portion integral with the upper portion, the lower portion having four vertically extending side surfaces and a bottom surface having cutting edges, each side surface having a vertically extending groove therein substantially at its center, and a headed heel slidably contained in each groove, each heel being spring-biased downward, the upper body portion being wider than the lower body portion and each heel extending upward through a circular hole in the upper body portion, each heel having a flat bottom surface and having its outer side flattened to conform to the outward shape of the lower body portion adjacent side surface, wherein the improvement comprises a slot in the upper surface of the upper body portion for each heel head, the heel head being flatted on two diametrically opposite sides thereof for sliding contact with the sides of the slot, each slot being of greater depth than the heighth of the heel head whereby each heel lower end is normally biased downward in advance of the cutting surface of the lower body bottom surface and is movable upward guided by the slot sides to a position with its head engaged against the bottom surface of the retainer member when the heel engages a workpiece portion.
Claim 6
Dependent Claim
236 words
A male shearproof punch having a retainer member adapted to be secured to a press, a punch body having an upper portion removably secured to the retainer member and a lower portion integral with the upper portion, the lower portion having four vertically extending side surfaces and a bottom surface having cutting edges, each side surface having a vertically extending groove therein substantially at its center, and a headed heel slidably contained in each groove, each heel being spring-biased downward, the upper body portion being wider than the lower body portion and each heel extending upward through a circular hole in the upper body portion, each heel having a flat bottom surface and having its outer side flattened to conform to the outward shape of the lower body portion adjacent side surface, wherein the improvement comprises a slot in the upper surface of the upper body portion for each heel head, the heel head being flatted on two diametrically opposite sides thereof for sliding contact with the sides of the slot, each slot being of greater depth than the heighth of the heel head whereby each heel lower end is normally biased downward in advance of the cutting surface of the lower body bottom surface and is movable upward guided by the slot sides to a position with its head engaged against the bottom surface of the retainer member when the heel engages a workpiece portion.
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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |