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Publication numberUS3149524 A
Publication typeGrant
Publication dateSep 22, 1964
Filing dateApr 27, 1962
Priority dateApr 27, 1962
Publication numberUS 3149524 A, US 3149524A, US-A-3149524, US3149524 A, US3149524A
InventorsCalisto Vecchi John
Original AssigneeOberg Mfg Co Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Piercing punches
US 3149524 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

P 22, 1964 J. c. VECCHI 3,149,524

PIERCING PUNCHES Filed April 27, 1962 5 9 FIG-3 FIG-2 0M ZINE-YEN:

BY W147 United States Patent 3,14%,524 PiERClN-G FUN Tohn Calisto Veeehi, Natrona Heights, P2,, assignor to Oberg Manufacturing Co., End, Freeport, Pa, a earporation of Pennsylvania Filed Apr. 27, 1952, Ser. No. 196,572 3 tllaims. (Cl. 83-687) This invention relates to new and useful improvements in piercing punches for tools and dies, more particularly to means for mounting piercing punches on a punch block to make them adjustable relative to other punches mounted in said block so that the piercing punch may be individually replaced or repaired in the event of wear or damage to the working face or end of the punch.

The invention contemplates the use of a series of annular grooves in the portion of the piercing punch that extends above the punch block in which a spring wire retaining ring is disposed to prevent the piercing punch from being drawn out of the block when the piercing punch is stripped from the material that it has punched or acted upon.

It is among the objects of this invention to provide an adjustable piercing punch which firmly secures the punch against displacement from stripping and which allows for varying the working end or face of the punch in relation to other punches mounted on the same punch block.

The invention will become more apparent from a consideration of the accompanying drawing constituting a part hereof in which like reference characters designate like parts and in which:

FIGURE 1 is a cross-sectional view of a punch block with a piercing punch shown in elevation adjustably mounted in accordance with the present invention;

FIGURE 2 is an enlarged view diagrammatically illustrating the adjustable portion of the piercing punch and the manner of supporting the same in the piercing punch block; and,

FIGURE 3 is a cross section of a punch block and punch holder assembly with the piercing punch mounted therein.

With reference to the several figures of the drawing, the numeral 1 designates a piercing punch having a piercing end 2 with the cutting face 3 at the end thereof. The piercing punch 1 is provided with a cylindrical shank 4 that is disposed in the punch block 5 and the shank is provided with a series of grooves 6 at one end for receiving a spring wire retaining ring 7.

The grooves 6 and ring 7 are more clearly shown in the enlarged view of FIGURE 2 in which it will be noted that the punch block 5 has a chamfered face 8 around the bore 9 in which the piercing punch is disposed. It will be noted in FIGURE 2 that the groove 6 is of cylindrical shape conforming to the curvature of the spring wire retaining ring 7, the curvature terminating in a straight face 10 that is disposed 30 angle from the axis of the piercing punch, as shown in FIGURE 2.

It is characteristic of a piercing punch to be drawn downward in an axial direction as it is stripped or withdrawn from the punched material and the pulling or stripping force acts upon the retaining ring 7, which in turn rests against the chamfered face 8 of the punch block. By placing the retaining ring 7 in any of the grooves 6, the end face 3 of the punch is adjusted relative to the lower face of the punch block 5 so that a series of piercing punches carried by the same punch block are adjustable relative to each other.

If in use the end of a piercing punch is damaged, as shown by dotted line in tip of piercing punch 3 in FIG- UB5 3 and had to be reground (or sharpened), the punch is removed from the punch block in the usual manner. The retaining ring 7 is then removed by pressing it against the 36 angle 10 of the punch. This forces the retaining ring 7 to expand and slide over the punch (body) shank 4 for easy removal of retaining ring 7. If the punching end is ground to a distance corresponding to the spacing between the grooves 6, and the retaining ring 7 is placed in the next groove (back), the length from the retaining ring to the punch tip 3 is again the same as the original length. The punch can then be replaced in the punch block to be in exact alignment and to the same length as the tips of the other piercing punches mounted in the block.

In FIGURE 3, the piercing punch is shown mounted on the punch block 5 and in the punch holder 11 in which it is secured by a set screw 12 and spacing plug 13 or any other conventional die builder method, so that it cannot be displaced in a vertical direction, the retainer ring 7 holding it against displacement in a downward direction.

Although one embodiment of the invention has been herein illustrated and described, it will be evident to those skilled in the art that various modifications may be made in the details of construction without departing from the principles herein set forth.

I claim:

1. The combination with a punch block and punch holder having bores in alignment for receiving a plurality of piercing punches, piercing punches having a cutting face and cylindrical shanks mounted in said bores, means for adjusting the ends of said punches relative to each other and to said punch block a pre-determined distance, said means comprising grooves in the shank of said punches of pre-determined spacing corresponding to the distance it is desired to adjust the cutting faces of said punches, a spring wire retaining ring disposed in one of said grooves, a recess in said punch block constituting a seat for said ring to lock the piercing punch against movement toward the punch block and means for securing the shank of said piercing punch in said punch holder to lock the punch against movement away from said punch block.

2. The combination set forth in claim 1 in which the bore of the punch holder is of lesser diameter than the retaining ring when the latter is disposed in a groove of the piercing punch shank.

3. Adjustable piercing punches as set forth in claim 2 in which the piercing punch is backed by a spacing block and set screw provided in the bore of the punch holder.

References Cited in the file of this patent UNITED STATES PATENTS 1,179,060 Williamson Apr. 11, 1916 2,390,309 Keys Dec. 4, 1945 2,974,967 Flemet Mar. 14, 1961

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1179060 *Apr 9, 1912Apr 11, 1916Autopress CompanyFastening device.
US2390309 *Mar 13, 1944Dec 4, 1945Keys Theodore FPiercer
US2974967 *Jan 23, 1959Mar 14, 1961Robert H KingTool holding means
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3379083 *Nov 19, 1965Apr 23, 1968Oberg Mfg Co IncMachineable headed punch
US3641860 *Nov 14, 1969Feb 15, 1972Lawrence V Whistler JrPunch retainer assembly
US4522053 *Dec 6, 1982Jun 11, 1985Augat Inc.Electrical connector programming tool
US4527349 *Feb 9, 1983Jul 9, 1985Big Jon, Inc.Trolling bar assembly
US4659064 *Aug 1, 1986Apr 21, 1987Keystone International, Inc.Apparatus for fixing the position of a valve element shaft in a bore
US6161350 *Nov 4, 1997Dec 19, 2000Espinosa; Thomas M.Fastener assembly serving as a product, or combined with other components as a product allows automatic controlled movements in one direction and prevents movements in the opposite direction when forces are applied
US6494654Dec 18, 2000Dec 17, 2002Thomas M. EspinosaTie down building, system tie down, and method
US6688058 *Apr 19, 2002Feb 10, 2004Thomas M. EspinosaFastener assembly serving as a product, or combined with other components as a product, allows automatic controlled movements in one direction and prevents movements in the opposite direction when forces are applied
US6951078Jul 23, 2002Oct 4, 2005Espinosa Thomas MFastener assembly serving as a product, or combined with other components as a product, allows automatic controlled movements in one direction and prevents movements in the opposite direction when forces are applied
US7159366Mar 24, 2005Jan 9, 2007Espinosa Thomas MFastener assembly serving as a product, or combined with other components as a product, allows automatic controlled movements in one direction and prevents movements in the opposite direction when forces are applied
US7340867Nov 13, 2006Mar 11, 2008Espinosa Thomas MFastener assembly serving as a product, or combined with other components as a product, allows automatic controlled movements in one direction and prevents movements in the opposite direction when forces are applied
US7617642Nov 17, 2006Nov 17, 2009Espinosa Thomas MFastener assembly serving as a product, or combined with other components as a product, allows automatic controlled movements in one direction and prevents movements in the opposite direction when forces are applied
US7665258Nov 8, 2006Feb 23, 2010Espinosa Thomas MFastener assembly serving as a product, or combined with other components as a product, allows automatic controlled movements in one direction and prevents movements in the opposite direction when forces are applied
US7698979Sep 22, 2004Apr 20, 2010Amada Tool America, Inc.Biasing assembly for a punching device
US9469043Nov 5, 2009Oct 18, 2016Amada Tool America, Inc.Biasing assembly for a punching device
US20050160690 *Mar 24, 2005Jul 28, 2005Espinosa Thomas M.Fastener assembly serving as a product, or combined with other components as a product, allows automatic controlled movements in one direction and prevents movements in the opposite direction when forces are applied
US20060060046 *Sep 22, 2004Mar 23, 2006Fumitaka SugizakiBiasing assembly for a punching device
US20070130857 *Nov 17, 2006Jun 14, 2007Espinosa Thomas MFastener assembly serving as a product, or combined with other components as a product, allows automatic controlled movements in one direction and prevents movements in the opposite direction when forces are applied
US20070130870 *Nov 13, 2006Jun 14, 2007Espinosa Thomas MFastener assembly serving as a product, or combined with other components as a product, allows automatic controlled movements in one direction and prevents movements in the opposite direction when forces are applied
US20070175135 *Nov 8, 2006Aug 2, 2007Espinosa Thomas MFastener assembly serving as a product, or combined with other components as a product, allows automatic controlled movements in one direction and prevents movements in the opposite direction when forces are applied
US20100095825 *Nov 5, 2009Apr 22, 2010Amada Tool America, Inc.Biasing assembly for a punching device
EP0255196A2 *Mar 12, 1987Feb 3, 1988Keystone International Holdings Corp.Valve
EP0255196A3 *Mar 12, 1987Feb 8, 1989Keystone International Holdings Corp.Valve
EP2276956A1 *Apr 29, 2009Jan 26, 2011Aktiebolaget Somas VentilerSeal device
EP2276956A4 *Apr 29, 2009Sep 11, 2013Somas VentilerSeal device
Classifications
U.S. Classification83/687, 83/699.41, 279/89, 83/698.91, 403/240, 403/107, 403/326
International ClassificationB21D28/34
Cooperative ClassificationB21D28/34
European ClassificationB21D28/34