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Publication numberUS2341187 A
Publication typeGrant
Publication dateFeb 8, 1944
Filing dateAug 3, 1940
Priority dateAug 3, 1940
Publication numberUS 2341187 A, US 2341187A, US-A-2341187, US2341187 A, US2341187A
InventorsFaber Elwood C, Menger Francis B
Original AssigneeArmstrong Cork Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Air ejector for dies
US 2341187 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

" Feb. 8, 1944.

AIR EJECTOR FOR DIES Filed Aug. 5, 1940 F. B. MEINGER ET AL 2,341,187

Patented Feb. 8, 1944 AIR EJECTOR FOR DIES Francis B. Menger, Lancaster Township, Lancaster County, and Elwood 0.

Lancaster County, Armstrong Cork Company,

Township,

Faber, Manheim Pa., assignors to Lancaster, Pa., a

corporation of Pennsylvania Application August 3, 1940, Serial No. 350,280

14 Claims.

This invention relates to an improved ejector for an air die.

The invention particularly is an improvement in the upper shoe or punch shoe for use in the combination disclosed in United States patent application of Elwood C. Faber, Serial No. 218,944, filed July 13, 1938, now Patent No. 2,250,450, issued July 29, 1941.

It is an object of the invention to provide an improved arrangement for removing the ejector or top center forming element of the punch.

A further object of the invention resides in providing an improved ejector or top center forming element.

A further object of the invention is to provide a novel means for ejecting any died articles which tend to stick to the ejector.

A further object of the invention is to provide an arrangement of parts such that wear of the parts of the die is minimized and uniformly distributed.

A further object of the invention is to provide an improved arrangement of air channels in the punch shoe and in the ejector or top center element to reduce the shock of usually concomitant in the operation of the device.

In the drawing, illustrative of the invention.

Figure 1 is an elevational view partially -in section through the punch shoe and one unit of themultiple die unit therein;

Figure 2 is an elevational view partially in section through the punchshoe and one unit therein at right angles to the view shown in Figure l; and

Figure 3 is a perspective view of the top con terelement partially in section.

Generally, the invention disclosed. in appli-. cation Serial No. 218,944 concerns dies for shaping metal sheets, and particularly such as are used to form ordinary metalv bottle caps. The. die disclosed therein comprises a lower shoe-containing die units each of which comprises a, central forming element with a draw; ring cushioned by fluid pressure, concentric with the central element, and an upper shoe. containing punch units each of which comprises a central forming element operated by fluid pressure surrounded by a cutting punch which cooperates. with the draw ring. In that embodiment, the upper cen.--

tral forming element has means. for electing the cap and both forming elements, are readily re.- movable for replacement within their respective surrounding elements, namely the draw, rin or;

the cutting punch. The present inventi n con;-

cerns an improved, form; of PU- whshoe which;

is adapted to cooperate with the die shoe of the prior application.

While the invention may be applied to air dies in general, it is hereinafter described with reference to a specific form of die which may be used in the formation of ordinary metal bottle caps, as in the prior application referred to above.

In the drawing, the body of the punch shoe is indicated generally by the numeral 2, and this body is backed by the hardened steel press plate 3. The body portion contains a central distributing chamber 4 connecting with ports 5 leading into the cavities containing the several punch units. Since the several units are all the same, only one will be herein described. The cavity or bore 6 in the body 2 has an enlarged portion 1- in which the thrust button 8 is held. The lower end of the bore or cavity 6 has an enlarged portion 9 within which the cutting punch l!) is fastened by means of machine screws ll. The ejector or top center element It operates within the bore 6. The top center element is maintained at any particular position by means of the friction between its surface and the spring urged ball [.3 which extends partly through an opening of smaller diameter than the ball in the side wall of the bore in the cutting punch H1. The upper limit of movement of the top center I2 is shown in Figure 1 where the top surface contacts the thrust button 8 while the lower limit of movement shown in Figure 2 is determined by the pin l4 extending through slot to in the top center element and being provided with groove [6 at one end adapted to cooperate with the spring urged ball ll. extending through an opening smaller in diameter than the ball in the cut-1 ting punch.

The arrangement of the pin l4 and the slot l5. enables replacement of' the top center element to. be readily made merely by poking the pin M out of the holes in the cutting punch. Replacement of top center element and bottom center element by; another cooperating pair of these elements enables the same die to be used in making caps having the same dimensions but different top. designs.

The top center element 12 has an annular groove 18 in alignment with the port 5 when t e element is at its upper position preliminary to the ejecting of the formed cap as shown in Fig ure 1. Suitable grooves I9 are spaced about the, head of the top center extending longitudinally thereoi to thegrooves 20,. forming a. network in the-head. The g fcmvesv l3 areso arranged a outv punch elements then moves upwardly away from the lower shoe, the 5 formed cap generally holding fast to the upper punch elements. At sure fluid, such as air, is introduced in accordance with the description in the prior applica tion into the chamber port 5 and grooves I8 and 4, flowing through the I9 to the space above this stage, a blast of a presthe top center element therebyforcing the top center down, and flowing through the hole 2 I, slot I5, and hole 22 to the face of the cap. As the top center moves downward, it quickly closes the port 5, after which the air expands into the space left above the head with a consequent decrease in pressure. This decrease in pressure together with the retardation resulting from the building up of pressure in slot I5 above pin I 4 because of the narrow passage for escape remaining around the pin results in a minimization of the shock that would otherwise occur when the top center strikes the pin I4. During the earlier part of this movement, the pressure in slot I5 below pin I4 and between the cap and the top center is less than atmospheric pressure and consequently the cap is held in place. However, pressure relatively gradually builds up in slot I5 below pin I4 to a pressure above atmospheric so that the air issues from hole 22 and th cap is blown off, whereupon the punch is ready for another punching cycle.

The arrangement of pin I4 so that it extends entirely through the top center to bearings at each end in the cutting punch III has the advantage of distributing the pressure uniformly across the die structure when the top center I2strikes the pin I 4 so that any wear of the bore and the parts operating within the bore is minimized and uniformly distributed.

While we have illustrated and described certain specific preferred embodiments of our inven tion, it will be understood that the invention is not limited to the form shown and described, but may be otherwise embodied and practiced within the scope of the following claims.

We claim:

In an apparatus of the character described, a shoe or a die, said shoe having a bore therein,

ially in said bore, and means on said member to close the first mentioned means upon movement of said member.

2. In an apparatus of the character described, a shoe of a die, said shoe having a bore therein, a central forming punch member slidable axiallyin said bore, means for admitting a pressure fluid into said bore to force said member to move axmeans on said member to close said first mentioned means upon movement of said member, and means for cushioning said cen-- tral member as it approaches the end of its movement.

3. In an apparatus of the character described, a shoe of a die, said shoe having a bore therein, a central forming punch member slidable in said I a shoe of a die, said shoe having a bore therein,

a central forming punch member slidable in said -'-'bore and having an annular groove separating said member into a head portion and a body portion, said head having axial grooves on its periphcry, a slot through the body portion, a longitudinal hole extending through said member from said slot to the top of said head, a second punch member concentric with said member, and a pin extending through said slot into the sides of said second punch member and means for supplying the first mentioned groove with a pressure fluid. 5. In an apparatus of the character described, a shoe of a die, said shoe having a bore therein, a central forming punch member slidable in said bore and having an annular groove separating said member into a head portion and a body pore tion, said head having axial grooves on its periphery, a slot through the body portion, a longitudinal hole extending through said member from said slot to the top of said head, a drawing punch member concentric with said member, and a pin extending through said slot into the sides of said drawing punch member and means for supplying the first mentioned groove, with a pressure fluid. 6. In an apparatus of the character described, a. shoe of a die, said shoe having a bore therein, a central forming punch member slidable in said bore and having an annular groove separating said member into a head portion and a body portion, said head having axial grooves on its periphery, a slot through the body portion, a longitudinal hole extending through said member from said slot to the top of said head, a cutting punch member concentric with said member, and a pin extending through said slot into the sides of said cutting punch member and means for supplying the first mentioned groove with a pressure fluid.

7. In an apparatus of the character described, a shoe of a die, said shoe having a bore therein, a central forming punch member slidable in said bore and having an tion, said head having axial riphery, a slot through the body portion, a longitudinal hole extending through said member from said slot to the-top of said head, a drawing and cutting punch member concentric with said member, and a pin extending through said slot into the sides of said drawing and cutting punch member and means for supplying the first mentioned groove with a pressure fluid.

8. In an apparatus of the character described,

punch member concentric with said central punch member, and a pin extending through said slot into the sides of said second punch member and means for supplying the first mentioned groove with a pressure fluid, and a second longitudinal hole extending from said slot to the forming punching face of said central punch member.

9. In an apparatus of the character described, a shoe of a die, said shoe having a bore therein, a central forming punch member slidable in said bore and having an annular groove separating said member into a head portion and a body portion, said head having axial grooves on its periphery, a chamber in said shoe, a channel from said chamber to said bore and having a port adjacent said annular groove and in alignment with the ungrooved portion of the periphery of the head, whereby movement of the punch member axially of the bore causes the closing of said port, a slot through the body portion, a longitudinal hole extending through said punch mem her from said slot to said head, a cutting punch member concentric with said central punch member, a pin extending through said slot into the sides of said central punch member, and means for supplying the first mentioned groove with a pressure fluid.

10. In an apparatus of the character described, a punching member having a bore extending along the direction of operation of said member and having two aligned holes extending into opposite portions of said member transversely of said bore, a forming punch member slidably disposed within said bore and having a longituinal slot extending transversely therethrough in alignment with said holes in said first-mentioned member, and a pin extending through the slot into said holes whereby the extent of sliding movement of said forming member with respect to said first-mentioned member is limited.

11. A die forming and ejector element adapted for axial movement in a bore of a die shoe having means for discharging fluid under pressure through a port into said bore and having a pin extending diametrically across said bore, said element having a peripheral groove adapted to communicate with said port and dividing said element into a head portion and a body portion; axial grooves spaced about said head portion and extending from said peripheral groove to the end face of said head portion whereby fluid under pressure from said port moves said element axially in said bore and moves said head portion into position to close said port; and a slot ex tending diametrically through said element and adapted to receive said pin.

12. A die forming and ejector element as claimed in claim 11 and having an axial channel extending through said element and intersecting with said slot whereby said pin restricts the rate of flow of fluid from said port through said element.

13. A die forming and ejector element adapted for axial movement in a bore of a die shoe having means for discharging fluid under pressure through a port into said bore, said element having an annular peripheral groove adapted normally to communicate with said port and dividing said element into a head portion and a body portion; axial grooves spaced about said head portion and extending from said peripheral groove to the end face of said head portion; and grooves extending across said end face of said head portion and communicating with said axial grooves for distributing fluid under pressure across said end face whereby fluid under pressure from said port moves said element axially in said bore and moves said head portion into position to close said port 14. A die forming and ejector element adapted for axial movement in a bore of a dieshoe having means for discharging fluid under pressure through a port into said bore, said element having an annular peripheral groove adapted normally to communicate with said port and dividing said element into a head portion and a body portion; axial grooves spaced about said head portion and extending from said peripheral groove to the end face of said head portion; grooves extending across said end face of said head portion and communicating with said axial grooves for distributing fluid under pressure across said end face whereby fluid under pressure from said port moves said element axially in said bore and moves said head portion into position to close said port; and an axial channel extending through said element and communicating with said end face grooves whereby fluid under pressure from said port flows from said head end face and through said element to the opposite, Work-engaging face of said element.

FRANCIS B. MENGER. ELWOOD C. FABER.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2541517 *Mar 9, 1945Feb 13, 1951Victor Metal Products CorpCan discharging and sorting mechanism
US2843070 *Mar 24, 1953Jul 15, 1958Williston Seamless Can CompanyMachines for shaping seamless metal cans and the like
US3002406 *Oct 1, 1959Oct 3, 1961Stevens & Bullivant LtdRotary swaging or forging machines
US3580120 *Nov 5, 1968May 25, 1971Schjeldahl Co G TMultipurpose punch
US4947716 *Apr 17, 1989Aug 14, 1990S. B. Whistler & Sons, Inc.Punch and die system
US5448933 *Mar 1, 1994Sep 12, 1995The Whitaker CorporationStamping machine stripper and die set
US6484551 *Nov 20, 1997Nov 26, 2002Daimlerchrysler AgProcess for manufacturing holes on the circumference of hollow sections
US6681611 *Jul 17, 2002Jan 27, 2004Daimlerchrysler AgProcess and device for manufacturing holes on the circumference of hollow sections
US7587830 *Apr 11, 2005Sep 15, 2009Textron Innovations Inc.Knockout punch with pilot hole locator
US20060016312 *Apr 11, 2005Jan 26, 2006Nordlin William FKnockout punch with pilot hole locator
US20100199819 *May 20, 2008Aug 12, 2010Amada Company, LimitedSlug float-up preventing method and punch tool
CN103350155A *Jul 19, 2013Oct 16, 2013铂翔超精密模具科技(昆山)有限公司Blanking flow channel
Classifications
U.S. Classification72/345, 83/98, 72/453.1
International ClassificationB21D45/00
Cooperative ClassificationB21D45/00
European ClassificationB21D45/00