Jan.~7, 1947. A, BQLDUC _ ` DIE REMOVING DEVICE FíledJuly l13, 1944 Í 2,413,943 Patented Jan. 7, 1947 42,413,943 UNITEDSTATES PATENT orlucr.N 2,413,943 DIE REMOVING DEVICE Albert Bolduc, Detroit, Mich. Application July 13, 1944, Serial No. `544,792 . 1 (ci. 164-418) 8 Claims. ` 2 . The invention relates generally to dies adapted to cooperate with punches for perforating sheet u tion, illustrating apparatus constructed accord ing to one form of the invention. Fig. 2 is a partial view of the apparatus shown by Fig. l, illustrating the parts at a different stage ñtted in place. Cl in the die-withdrawing operation. Fig. 3 is a cross-sectional View taken substan In connection with apparatus for perforating metal or the like, and it has particular relation to a device for removing dies that are press sheet metal or the like, it is conventional to use a female die element and a punch, and these are tially along the line 3-3 of Fig. l. ‘ Fig. 4 is a cross-sectional view taken substan tially along the line 4-4 of Fig. 1. respectively anchored on relatively movable parts Referring to Fig. 1, the mechanism illustrated of the machine or apparatus. With respect to 10 comprises an upper `platen l0 having a punch the punch in particular, it is usual to have the holder or block ll which is secured by machine punch releasably mounted so that one punch may be substituted for another, and one form of re leasable connecting means comprises a spring pressed ball which is adapted to seat in a groove or recess in the punch. When it is desired to re move the punch, it is only necessary to move the ball out of the recess and then the punch may be screws i2 to the platen. The block or holder H has an opening I4 which is adapted to receive'a punch, not shown, and for releasa‘cly holding the punch in position a spring-pressed ball device is employed, This device comprises a ball I5 mov able in an opening or bore IS in the block and which is normally urged towards the opening M The same type of releasable connection may be 20 by a spring Il. The ball engages a groove or re cess in the punch, and upon upward movement employed for holding the female die in place, but of the punch the ball through a wedging action in many instances such connections are Ilot used. withdrawn. Instead of using this type of connection, the prevents the punch from being pulled out. For female die is press-fitted in an opening in a die-holding element, and then when it becomes ._ the purpose of pushing the hall upwardly when the punch is to he removed, a pin may be moved upwardly through a small opening I8 in the bot tom of bore it. This type of punch holding de vice is disclosed in Richard Patent No. 1,621,811. necessary to remove the die, the holding element must be removed and then the die is pushed out of its opening by any kind of suitable pushing instrument powerful enough for this purpose. This necessarily requires `time and effort. One object of the present invention is to pro vide a device for removing the female die from its holding element without requiring removal of the latter, so as thereby to save considerable time and effort formerly required in removing the die. Another object of the invention is to provide an improved device for removing the female die which can be substituted for the punch element and then used as part of the machine for re moving the female die during the withdrawing movement of the punch support. ` f . And, in general, it is an object of the invention to provide a device which maybe quickly and easily used for removing the female die without requiring removal of the holding element there for. . The lower part of the mechanism comp-rises a base 26 having a ‘clock 2l releasably fastened by ' devices 22 and a die block 24 fastened by machine screws 25 to the block 2l. The female die is indi cated at .25, and is sumciently press-iitted in an opening 27 inthe block 25 that normally it will be removed by any forces occurring during withdrawal of the punch. It is to be noted that the die, as shown, has an opening lißthrough which the punch operates, and that below this opening a larger diameter 29 is provided and that at the junction of the` two diameters a slightly rounded annular shoulder 3G is present. The device constructed according to the present invention comprises a sleeve 35 having a recess 3S for engagement with the ball l5, so that the sleeve may be inserted in place of the punch. A _second part of the device comprises a pin ¿il which has an axial groove or slot 39 at its upper Vend and a circumferen-tially extending groove t!) Other objects oi‘ the invention will become ap intersecting the‘axial groove. The pin S8 is re« parent from the following specification, from the 50 leasably held in the sleeveläo by means of a pin drawing relating thereto, and from the claims 4i extending crosswise of the sleeve and engaging hereinafter set forth. the opening in the pin. The axial slot 39 has. a For a better understanding of the invention, flat bottom, as indicated atAZ of Fig. 3, and it reference may be had `to the drawing, wherein: should be evident thatV when the pin 33 is turned Figure l is a vertical view, partly in cross sec- ' to one position, it maybe either inserted or with 2,413,943 3 4 drawn past the pin 4I . However, when the pin 38 has been inserted, as seen in Fig, 2, and then is tainer and releasably locked thereto in place of the punch, whereby a withdrawing movement of fthe retainer through operation of the machine turned, the pin 4| becomes interlocked with the groove 40, as shown in Fig, 3, and then the pin may be used to remove the die. 38 is held in the sleeve. 2. In a machine having an apertured die held u 'I'he lower end of the -pin 38 has a frusto in the opening in a holder and a reciprocatory conical head 45 terminating in a cylindrical wall member adapted to carry a punch co-operable 46 which is slightly smaller than the opening 28 with the die, a device for removing the die from in the female die, so that it may readily be moved through it. Between the end of the sleeve 35 and the frusto-conical surface on head 45, a split ring 41 is provided, and this ring is so arranged and is of such resilient character that it normally is slightly larger in outer diameter than the die opening 28. Also, in its normal condition, its inner diameter is slightly smaller than the outer diameter of the sleeve 35 and smaller than the cylindrical surface 46, so that it cannot slide up~ the holder and comprising shank means adapted to be connected at one end to the member in place of the punch, and means on the other end of the shank means adapted to enter the die aperture and automatically to expand after insertion so as to engage the die and withdraw the latter when the member is moved away from the die holder. 3. In a machine having an apertured die held in the opening in a holder and a reciprocatory member adapted to carry a punch co-operable wardly over the sleeve or downwardly over the with the die, a device for removing the die from .head 45. the holder and comprising shank means adapted With the sleeve 35 and pin 38 attached to the to be connected at one end to the member in upper block Il, the upper platen l0 is allowed lto place of the punch, and means on the other end move downwardly, and during this operation the of the shank means adapted to ñrst radially con head 45 on pin 38 moves downwardly through tract and enter the die aperture as the member the opening 28 in the die 26, and the split ring 25 moves toward the holder and then to expand ra 41 contracts as it moves into the o-pening 28. As dìally to engage the die and Iinally to withdraw soon, however, as the ring passes completely the die from the holder upon a reverse movement through the opening 28, its inherent spring action of the member. causes it to expand again, and then it assumes a 4. In a machine having a die holder and an position in contact with the shoulder 38, as 30 apertured die held in an opening in the holder, seen in Fig. 1. Now as the platen I0 is moved upshank means insertable endwise into the die aper~ wardly, the split ring 41 becomes wedged between ture, means on the insertable end of the shank means adapted to enter the die aperture and the shoulder 30 and the frusto-conical surface of then automatically expand radially to engage the head 45, and as a result the female die 26 be comes positively vinterlocked with the pin 38. die, and a member connected to the other end of Further upward movement of the platen l0 now the shank means and which is reciprocatory to causes the pin 38 to pull the female die 26 out of wards and from the die in order ñrst to move its opening, and this will occur even though the the shank means into the die aperture and then die is strongly press-fitted in the opening. , upon reverse movement to withdraw the die from As soon as the die is withdrawn, the sleeve 35 40 the holder. 5. A device for pulling a die element out of a and pin 38 may be removed from the block I I and holder wherein the element has a die opening then the pin may be removed from the sleeve which terminates inwardly in a, surface of larger 35, and this allows the die 26 to be separated from diameter, which comprises a shank adapted to be the pin. It is evident that by turning the pin 38 relative tothe sleeve 35, the pin may be pulled tp. inserted into the opening, an enlarged head on the insertable end of the shank and which has a out of the sleeve and hence pulled out of the die conical surface merging into the shank body, a that has been removed, and then the split ring fixed collar on the shank adjacent the smaller will fall out of the die opening. end of the conical surface, and a resilient radially It might be noted that the ring 41, as well as other parts of the device, may be constructed of 50 expansible and contractible ring element slidable i metal suitable for the purpose, and that in par on the shank between the conical surface and the ticular the head 45 will be sufficiently hard alone` with the ring that the female die will be posi fixed collar and which is capable of sliding be tween such surface and collar when the shank is tively removed. Any suitable spring wire or ma inserted into the die opening so as to permit the element to be moved by the collar and to radially chined spring steel ring may be used, as will be contract about the shank as the element is moved evident to those skilled in the art. through the opening by the collar and to expand Although only one form of the invention has and be anchored against the conical surface when been illustrated and described in detail, it will be the shank is moved in the reverse direction. apparent to those skilled in the art that various 6. A device for pulling a die element out of a modifications may be made without departing 60 holder wherein the element has a die opening from the scope of the appended claims. which terminates inwardly in a surface of larger What is claimed is: diameter, which comprises a shank adapted to be 1. A device for use in removing a die element inserted into the opening, an enlarged head on having a die aperture from the opening in a holder in a metal punching machine having a 65 the insertable end of the shank and which has a surface of reduced diameter next to the shank reciprocable punch retainer, a punch, and re body, a fixed annular collar on the shank adja leasable means to lock the punch in the retainer, cent the surface of reduced diameter, and a re wherein the device comprises shank means silient radially expansible and contractible ring adapted to be inserted into the die aperture, means on the insertable end of the shank means element slidable on the shank between the collar and said surface of reduced diameter and which which is radially expansible to engage the die element in order to remove the latter from the holder when the shank means is withdrawn, and is capable of sliding between such surface and collar when the shank is inserted into the die means on the other end of the shank means opening so as to permit the element to move to 75 wards the collar and to radially contract about adapting the latter to be connected to the re 2,413,943 5 the shank as the element is moved through the 6 ` ~ opening by the collar and to be expanded and which terminates inwardly in a surface of larger diameter, which comprises a shank adapted to be anchored against the head when the shank is inserted into the opening, an enlarged head on moved in the reverse direction. 7. A device for pulling a die element out of a the insertable end of the shank, ñxed shoulder holder wherein the element has a die opening which terminates inwardy in a surface of larger diameter, which comprises a shank adapted to be inserted into the opening, an enlarged head on the insertable end of theV shank, ñxed shoulder abutment means on the shank adjacent the head but spaced therefrom, and a resilient radially ex pansible and contractible ring element on the shank between the head and abutment means and having an axial length substantially less than the distance between the head and abutment means so that the element can move along the shank, the abutment means being adapted to force and simultaneously cause contraction of the element through the die opening when the shank is in- „ serted into the opening and the head being adapted to anchor against the element when the shank is reversely moved and the element has eX abutment means on the shank adjacent the head but spaced therefrom, and a resilient radially ex pansible and contractible ring element on the shank between the head and abutment means and having an axial length substantially less than the distance between the head and abutment means so that the element can move along the shank, the abutment means being adapted to force and simultaneously cause contraction of the element through the die opening when the shank is inserted into the opening and the head being adapted to anchor against the element when the shank is reversely moved and the element has ex `banded against the die surface of larger diame ter, said ring element having its outer peripheral surface next to the head sloping to smaller di ametrical dimensions so as to cause the element to contract into the die opening when the sloping surface is pressed axially against the edge of the opening. panded against the die surface of larger diameter. 8. A device for pulling a die element out of a 25 holder wherein the element has a die opening ALBERT BOLDUC.