US2737139A

US2737139A - Parts remover

Info

Publication number: US2737139A
Application number: US202360A
Authority: US
Inventors: Charles E Smith
Original assignee: Individual
Current assignee: Individual
Priority date: 1950-12-22
Filing date: 1950-12-22
Publication date: 1956-03-06
Anticipated expiration: 1973-03-06

Description

March 6, 1956 C, E, sMn-H 2,737,139

PARTS REMOVER Filed Dec. 22, 1950 FIG. 1

w las 40 38 32 o Xi .s 33 3i :Wxk x w 6 5 FIG. 6 H6637 FIG. 8

INVENTOR.

C. E.. SMITH ATTORNEY Unite i This, invention relates to a parts remover and more particularly to a device adapted to be used in conjunction with a male die block for engaging and stripping a part formed by the dies from the female die block.

At the present time there are two methods in com.- mon use for removing parts from the female die block. One of these is known as the Marquette pins method, and the other involves the use of sharp welded'v spots on the sides of the male die block.

In the Marquette pin method a oating ring with attached pins is utilized which is in turn attached toy an air cylinder, these parts are located in the female die block and on the down stroke the male die block forms the part and compressed air in the cylinder. The air compressed in the cylinder under the female die block expands and ejects the part during the upward movement of the male die block by means of the oating ring and the attached pins. This method does not function satisfactorily where the parts to be formed require coining, deep draws or the dies actually cause the metal to flow while being formed.

In, the. second method commonly utilized spots. are welded on the sides of the male die block and are then dressed, down so that the spot lug tapers toward the female die block but has a sharp edge on the upper side at right angles to the side of the male die block. These spot lugs are usually about one-half inch long and ex.- tend from the male die block about lifteen, ten-thousandths of an inch, which is sutlicient to cause a owof metal` on the down stroke, distorts the part being formed, and causes a ange along the top edge which hasto be removed later in a subsequent operation thus scarring the inside of the part being formed. When the male. die block makes the return stroke, these sharp edges pulll the part from the female portion of the die. The parts are then knocked off of the male part of the die.

ln, oneA preferred embodiment of the present invention a. parts remover is provided having a plug which may be inserted in a hole drilled at right angles into the. side of the male die block and a substantially cylindricalv guide whichv is threaded into the plug. The guide is provided with. a diametrical slot in which is mounted a sliding wedge or a pivoted element having serrated teeth on its outer edge which normally extend beyond the side of the male die block. The sliding wedge almost disappears into the male portion of the die during the down, stroke of the die press so that the serrated teeth only extend a very slight amount. The slight projection of the: teeth is. not snflicient to distort the part being formedY or to cause excessive ow of metal. However, on the upy stroke the serrated teeth grasp the formed part and readily re.- move it from the female die block. Subsequently the part may be readily knocked olf of the male die` block or stripped in a conventional manner.

One object of the present invention is to overcome the disadvantages enumerated above and to provide a sim.- ple, inexpensive parts remover which may be readily attached to and removed from the male die block.

States Patent v 2,737,139 Patented Mar.' 6- 1956v "ice Another object of the present invention is to provide a parts remover which may be readily inserted in a portion of the male die and may be conveniently replaced, whenever the operative portion thereof has become Worn.

Another object of the present invention isy to provide a parts remover which will effectively remove the formed part from the female die block without any substantial damage to the part being formed.

Further objects and advantages of the invention will be apparent from the following. description taken in con.- iunction with the drawings, wherein:

Fig. 1 is a sectional view of the male and female die block with a sheet oi metal therebetween in position to be formed and showing one preferred embodiment ofthe present invention recessedy in each of the opposite side walls of the male die block.;

Fig. 2. a similar sectional view illustrating' the parts shown in Fig. l in the second step of 4.the operation, where the.- sheet of metal has been formedinto a part;

Fig. 3 a similar sectional'fviewiwvithf-'a portion of the female die block broken away showing the part removed from the female die block and heldon the male die block by' the. serrated teeth on the parts: remover;

Fig.. 4 anl exploded view showing the separate elements of the: preferred embodiment of the present invention, as illustrated in, Figs. l through; 3;

Fig. V5 a sectional view of one modified form of parts remover; f

Fig. 6 a Viewy of the partsl remover shown in Fig. 5, with the gripping element inthe. upper position, engaging a part in. ar manner similar to that shown in Fig. 3;

Fig.. 7 a sectional view of a still further modified form of parts remover made in accordance with the present invention; and

Fig.. 8 a view similar` to'y Fig. 'Z with the gripping ele mentv in operative position for removing a part from the female die.

Referring now to the drawings in detail and more particularly to Fig.. 4, the separate elements of one preferred embodiment of thepresent invention are; `shown in anv ex.- ploded: view and` consist of a-cylindrical plug 10 which i-s provided with* a threaded opening 12 extending therethrough and a slide guide 14 which. is provided with a threaded projection 16 adapted to engage. the threaded opening. 12. The.v slide. guide, 14l is. substantially cylindrical in shape and is provided with a diametrical slot 18 which has an upwardly inclined end surface 20. An opening 22 extends diametrically through the slide guide 141 at right angles to the slot 1-8. Slide guide 14 is also provided with a pair ofv shallow recesses 2'4 and 26 at diametricallyopposed points on, the end surface. Recesses 2,4 and 26; are. provided, for engagementY by a span.u ner' wrench for insertion, and removal of the. slide guide 14e inthe plug 10A inV a manner to be described'. subsequently.

A sliding; wedge or. gripper 28 is provided with an inclinedV rear edge surface 30. at substantially the same angle, as; the inc1ined-surface20 and a forward. edge serrated: as: shown at 32 to provide aplurality of teeth and having af beveled upper corner 33. An elongated opening 34 isY adapted, to slidably receiver a pin 36 which may he inserted with. a. force t into the diametrically opposed openingsv 22 inthe slide guide 14.

The: elements shown in Fig. 4 areassembled in a mannerl which: is clearly apparent from; the; sectional views shown in; Figs. l through, 3. The plugs 10 may be shrunk or force fitted into the bottomY of one or more cylindrical recesses 38 formed'. preferably in the. diametrically opposedl sides ofthe male die block 4.0,y as shown in Figs.,1 through 3. The slide guide 15. has been previously assembled with the. sliding wedge 28 which is retained in an operative position by thel pin 36, and is screwed into the plug 10 by a spanner wrench engaging the

recesses

24 and 26.

It will be obvious that in the position as shown in Fig. 3 the sliding wedge 28 will move downwardly on the pin 36 so that the serrated edge 32 may extend out a sufficient predetermined distance beyond the surface of the male die block to remove the article. rI`he exact extent of the projection will vary in different usages depending largely on the size of the parts being formed and the metal of which the part is being made. In some common usages this may pretflerably be in the order of a few thousandths of an mc When the male die block 40 is pressed downwardly to form the sheet material 42 inthe female die block 44, as shown in Fig. 2, the slidingv wedge 28 is forced to an upper position on the pin 36 and the serrated teeth 32 will extend only a very slight distance. In some common usages this may preferably be in the order of only a few ten thousandths of an inch which is just sufficient to provide engagement with the part formed in the manner shown in Fig. 3 without distorting or scarring the interior surfaces.

It will be apparent that during the downward movement of the male die block 40 the sliding wedge or gripper 28 will be wedged upwardly and inwardly to its substantially flush position with the serrated edge 32 projecting a very slight amount, but on the upward stroke the engagement of the tips of the teeth on the serrated edge 32 against the surface of part formed will urge the gripper 28 downwardly and outwardly into rm engagement with the part being removed.

After the part has been removed from the female die block 4, it will be very simple to knock the part thus formed off of the male die block 40 with a suitable instrument, since the part formed will tend to spring slightly away from the male die block 4l). If desired, a suitable die stripper may be used for removing the parts from the male die block during the latter part of the upward stroke, and may have a thin element which will enter between the part and the male die block 40 and engage the upper beveled corner 33 of the gripper 28 to force it inwardly out of engagement with the part formed. When the teeth on the serrated edge 32 have worn sufficiently to become inoperative, the parts remover can be removed by a spanner

wrench engaging recesses

24 and 26 and a new remover inserted. If for some reason the new remover does not line up properly with the serrated edge substantially parallel to the side surface of the male die portion 40, the plug 10 may be readily drilled out and a complete new unit inserted.

The modied form of parts remover shown in Figs. and 6 is similar to the parts remover shown in Figs. 1 through 3 as far as its insertion and use in the male die block, and is likewise provided with a cylindrical plug having a threaded opening 12 adapted to receive the threaded projection 46 on a cylindrical guide element 48 which is provided with a transverse recess 50 in which a pivoted gripping element 52 is mounted on a pin 54. Gripping element 52 is provided with a serrated edge S6 which is disposed at a slight angle, so that in the upper position, as shown in Fig. 6, the tips of the serrated teeth will extend a very slight distance beyond the surface of the male die block to grip the sheet of material 42 as shown. The end of the pivoted gripping element extends slightly, as shown in Fig. 5, during the downward stroke of the male die block. While the part is being formed, it engages the end of the gripping element and moves it up into the position shown in Fig. 6, and on the upward stroke the serrated teeth engage the surface of the part 42 to remove it from the female die in a manner somewhat similar to that illustrated in Figs. l through 3.

In the modication shown in Figs. 7 and 8, the threaded opening 12 in the plug 10 receives the threaded projection 58 on the guide member 60 which is provided with a transverse or diametrical slot 62 in which a gripping element 63 is slidably mounted. The gripping element 63 has an elongated slot 64 through which extends the flat sided pin 66. The gripping element 63 is likewise provided with a serrated edge 68. A substantially J- shaped arm 70 is pivotally mounted on a pin 72 and has its outer end portion projecting slightly beyond the end of the guide member 60 in its normal position, as shown in Fig. 7. In this form of the invention the gripping element 63 is positively moved by the engagement of the projecting end portion of the lever arm 70 by the part 42 during the formation thereof from the position shown in Fig. 7, where the serrated edge 68 is substantially ush with the outer end of the guide member 60 and the surface of the male die block to the position shown in Fig. 8, where the outer end of the teeth project a very slight distance just suflcient to engage the part and remove it from the female die block.

It will be obvious that in the forms of the invention shown in Figs. l through 6 the tangential force exerted by the part being formed during the downward stroke of the male die block will tend to move the gripping element to its innermost position and during the upward stroke the part will exert a tangential force downwardly in the opposite direction which tends to press the gripping element into firmer engagement with the part.

In the form of the invention shown in Figs. 5 and 6, the serrated edge may be slightly curved, if desired, so that only a relatively small portion will be engaged by the part at any time, thus providing to a certain extent a rolling contact between the part and the serrated edge of the gripping element.

In the forms shown in Figs. 1-3 and Figs. 5 and 6 a slight clearance may be left between the upper surface of the gripping element and the surface of the male die block or the upper edge of the slot 50, so that the gripping element can move to a position where the teeth do not project at all. In this case engagement of the gripping element with the part 42 would be dependent on the weight of the gripping element maintaining it in engagement with the part, which would not provide positive engagement, but the serrated edge would be less liable to scar and damage the part during the downward stroke and would ordinarily provide suiicient engagement during the upward stroke to remove the part from the female die block. l

It will be obvious to those skilled in the art that various changes may be made in the invention without departing from. the spirit and scope thereof, and therefore the invention is not limited by that which is shown in the drawings or described in the specification, but only as indicated in the appended claims.

vWhat is claimed is:

l. A parts remover for a die press having male and female die blocks said parts remover comprising a cylindrical plug adapted to be inserted in a hole formed in the side of the male die block, a substantially cylindrical slide guide having a diametrical slot formed in one end thereof with an upwardly inclined inner end wall, a sliding wedge disposed in said slot and having an inclined edge slidably engaging said inclined wall, an elongated opening extending transversely through said wedge with its longitudinal axis parallel to said inclined edge, a pin extending through said elongated opening and secured to said slide guide, said sliding wedge having a serrated end surface forming teeth the tips of which extend slightly beyond the end of said slide guide when said wedge is in extended position, said wedge having a beveled corner at the upper end of said serrated end surface, threaded means connecting said plug and said slide guide, and vrecesses in the outer end surface of said slide guide for engagement by a Spanner wrench to engage or disengage said threaded means.

V2. A parts remover for a die press having male and female die blocks said parts remover comprising a cylindrical plug adapted to be inserted in a hole formed in the male die block, a substantially cylindrical slide guide having a diametrical slot formed in one end thereof with an upwardly inclined inner end wall, a sliding wedge disposed in said slot having an inclined edge slidably engaging said inclined wall, an elongated opening extending transversely through said wedge with its longitudinal axis parallel to said inclined edge, a pin extending through said elongated opening and secured to said slide guide, said sliding wedge having a serrated end surface forming teeth the tips of which extend slightly beyond the end of said slide guide when said wedge is in ex tended position, and threaded means connecting said plug and said slide guide.

3. A male die for cooperation with a female die for forming an article, said male die having a recess formed in a side thereof adjacent the upper operative portion, an inclined cam surface in said male die recess with the cam surface being spaced a greater distance from the surface thereof adjacent the upper portion than at the lower portion, an article remover in said recess mounted for movement in a direction generally parallel to and transversely of the movement of the die, said article remover having a cooperating cam surface for coaction with said first mentioned cam surface whereby upward movement on said male die causes relative downward vertical movement of the article remover relative to said male die producing a projecting transverse movement of said remover, and means for preventing accidental loss of said remover from said die and preventing excessive movement of said remover in its projecting direction.

4. A parts remover comprising a slide guide for application to a male die in a recess formed in such die, said slide guide being provided with a slot extending inwardly from the outer end thereof and having a cam surface converging with the outer surface of the die in the direction of operative movement of the die, a gripper slide mounted in said slot and having an inclined surface cooperating with the cam surface and movable relative to the slide and die in the direction of movement of said die whereby movement of said gripper in the direction of operative movement of said die causes said gripper to project outwardly of said die and movement of said gripper in the direction of withdrawal movement of said die relative to said die allows said gripper to move inwardly of said die, means for preventing accidental removal of said gripper from said slide guide, and stop means to prevent excessive projection of said gripper beyond the surface of the die.

5. A parts remover for a die comprising a cylindrical guide provided with a slot extending from one end toward the other end and terminating in an inclined cam surface at an acute transverse angle to the axis of the cylinder, a gripper slide mounted in said slot and having a serrated surface substantially normal to the axis of the cylinder and having a cam follower surface at an acute angle to said serrated surface for cooperation with said cam surface, said gripper slide being of less length than the diameter of said cylinder whereby said gripper slide may move transversely of said cylinder and the serrated surface thereof be projected beyond said cylindrical guide, and means between said guide and slide for maintaining said gripper slide in operative relation with said cylindrical guide and for preventing excessive projection of said serrated surface beyond the said one end thereof.

6. A parts remover comprising a plug for insertion into a recess in a die, said plug having a slot therein extending from one end thereof toward the other and terminating short of the other end with with a cam surface at an angle to the surface of the die in which it is to be inserted, a gripper slide mounted in said slot having a cam follower surface for engagement with said cam surface and a serrated article gripping surface opposite to the follower surface, means for maintaining said gripper slide in said plug and for limiting the projection of said serrated surface beyond the die whereby an article on the die is engaged while the article is in the cooperating dies and such article may be released upon separation of the dies.

7. Means for forming material comprising male and female dies, the male die being provided with an opening in one side thereof, an article engaging member, means for mounting said member in said opening to permit movement of said member in said opening in directions parallel to and transverse of the movement of said male die, said member being movable to a position in which the outer extremity extends outwardly an appreciably greater distance from the side surface of the male die, a stop to limit the extent of outward movement of the member, the outer extremity of said member being movable in the direction of movement of the male die in the forming operation, connections between said member and said male die to permit said member when moved relative to the male die in the direction of forming movement of the male die being projected outwardly, and said member when moved in the work extracting direction relative to the male die being withdrawn to its innermost position, the outer extremity of said member having means for positively engaging the work being formed to positively remove the work from the female die upon the withdrawal of the male die.

8. The invention according to claim 7 in which said mounting means comprises a plug, a slot 'm said plug and a pivot connecting said member and said plug.

9. The invention according to claim 7 in which said mounting means includes a plug for reception in the opening of the male die, means adjustably limiting the entry of said plug in said opening to control the amount of projection of the member from said die.

References Cited in the le of this patent UNITED STATES PATENTS 1,524,288 Burns Ian. 27, 1925 1,895,401 Simonsen et al Jan. 24, 1933 2,246,954 Schleinitz June 24, 1941 2,270,186 Dulmage Jan. 13, 1942 2,324,205 Gladfeller July 13, 1943 2,341,667 Stacy Feb. 15, 1944