US1825343A - Method of extrusion and apparatus therefor - Google Patents

Description

c. o. EVANS Iii T1101) OF EXIRUSION AND APPARATUS THEREFOR Sept. 29, 1931;

' Filed March 5, 195::

'5 Sh qts-Sheet 1 -INVEN R KQ ATTORN EYS Z c. o. E-VANS .Sept. 29, 1931.

METHOD OF EXTRUSION AND APPARATUS THEREFOR Filed March 5. 1950 5 Sheets-Sheet. 2

5 Sheetsi-Sheet 3 C. O. EVANS METHOD or EXTRUSION- ANpAPPARATus mutton Filed March 5. 1930 F'I Gr. 6.

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w s m Sept. 29, 1931.

E ATTORiEYS Z Sept. 29, 1931.

c. o. EVANS 1,825,343 METHOD OF EXTRUSION AND APPARATUS THEREFOR Filed March 5. 93:: s Sheets-Sheet 4 Fl GL9. 2:

1/ l l'" l INVENT OR.

Sept. 29,1931. I c. o. EVANS- v 1,825,343

METHOD EXTRUSION AND APPARATUS THEREFOR Filed March 5. 1950 s Sheet s-Sheet 5 V 5 FIG. 10.

VENTZR BY Patented Se t. 29, 1931 UNITED STATES PATENT orrica Ipplication filed March 5, 1930. Serial No. 433,228.

This invention relates to the art of extrusion, and to the apparatus therefor, and has particular reference to the extrusion of metal tubing, with a view mainly to uniformity of thickness of the walls of the tube throughout its longitudinal and circumferential extent.-

The extrusion of tubing has under a certain practice been effected by forcing the metal, held in a container, through an extrusion die and around a mandrel extending within the container and into the die, and it has been attempted in this practice to center the mandrel in relation to the die by forming a central bore in the billet or metal charge before introducing the same into the container, and projecting the mandrel into said bore. This procedure has not proved entirely satisfactory, because in order to slide a hot billet into the cylindrical chamber of the container, a substantial clearance is demanded between the billet and chamber walls (in other words, the billet must be less in diameter than that of the chamber), and hence the center line of the containerand the center line of the billet will vary to an extent corresponding to the Since it is necessary to amount of clearance.

ush the mandrel through the bore in the illet before exerting the extrusion pressure, it follows that when this pressure is applied,

the billet (being shortened in taking up the clearance, and its diameter being increased) will be caused to completely fill the container, with the result that the center line of the billet, and consequently that of the mandrel will be displaced relative to the center of the die, and the mandrel will be forced out of the true line of extrusion. The extruding action under these conditions will result in the formation of a tube having an eccentric bore and with the walls consequently off gauge.

The present invention -overcomes these obj'ections by casting the billet directly into the container, while at the same time forming in the billet a mandrel centering bore. This operation is preferably effected by pouring the molten metal charge into the container while held in an upright position and around a removable bore formlng core therein, which core on being removed from the metal charge,

after the latter has more or less solidified in the form of a billet, bore therein.

Under this procedure, the metal charge will completely and solidly fill the container, andthe bore in said charge will be in the true line of the center of the container, so that when the mandrel is inserted in said bore, it will extend in the true extrusion line and will be will leave a. centering accurately centered in relation to the die.

Consequently, a uniform annular extrusion no space will exist between the exterior of the mandrel and the interior of the die, and the tubing extruded through said s ace will have a truly concentric bore and walls of uniform thickness throughout their longitudinal and 05 circumferential extent.

In carrying out this procedure, an apparatus is employed of novel form and construction, wherein two containers are adapted to be supported alternately in operative relation to the extrusion die, said containers being movable from their operative positions laterally to points free of'the die for the purpose of recharging, one of the containers be ing recharged while the metal is being extruded from the other container and vice versa, whereby the extruding operations will be carried on continuously and without waste of time.

As a further novel characteristic of the an apparatus, a cradle is'employed at the end of a guideway leading laterally from the point of operative support of a container, into which cradle the container is moved in a horizontal' position from the guideway, and by which it is adapted to be turned to an up right charge-receiving position; and for the formation of the mandrel centering bore in the charge or billet, as hereinbefore referred to, ajcore is mounted movably on the cradle, and by suitable means is thrust into the container, so that the billet may be cast therearound, and is then removed fromthe billet to leave a bore therein.

These and other features of operation and construction of the invention will be described in detail in the specification to follow, and the novel characteristics thereof will be pointed out in the appended claims.

In the accompanying drawings- Fig. 1 is a plan view, partly in section, of

the main portion of an extrusion press suitable for practicing the invention;

Fig. 2 is a sectional elevation of thesame;

Fig. 3 is a vertical sectional elevation on an enlarged scale through an operatively positioned container and the extrusion die, the section being taken on the line 3-3 of Figs. 1 and 2;

Fig. 4 is a transverse sectional elevation of the same on the line 44.- of Fi 3;

Fig. 5 is a rear elevation 0 one pf the cradles for turning the container to an upright position for recharging, the same being shown in a position to receive the empty container in horizontal position;

Fig. 6 is a side elevation of the same;

Fig. 7 is a sectional view of the cradle, with the container in the cradle, and the latter rocked from the positionshown in Fig. 6 through 90 to turn the container to an up right charge receiving position;

Fig. 8 1s a view similar to Fig. 7, showing the container filled with the metal charge or billet and with the core seated therein;

Fig. 9 is a view similar to Fig. 8, showing the cradle moved back to the position shown in Fig. 6 and with the core withdrawn from the billet, and the charged container ready to be moved from the cradle and returned to operative relation to the extrusion die;

Fig. 10 is a view showing in section the container with its cored billet and the extrusion die, and showing in elevation the mandrel and ram before the mandrel is entered in the die;

Fig. 11 is a similar view showing the mandrel seated in the bore in the billet and centered in the die;

Fig. 12 is a view similar to Fig. 11 and showing the ram acting at the rear end of the billet and extruding the metal through the die in the form of a tube.

Referring to the drawings- The extrusion press illustrated and to which the invention is applied, comprises as usual an extrusion die 1, a ram 2, an associated mandrel 3 movable relatively to the ram within a longitudinal guiding opening therein, and a container 4 for the metal to be extruded, which container inaccordance with the invention is adapted to be positioned in operative relation to the die, mandrel and ram, .and to be bodily removed therefrom for recharging, there being in the present form of the invention, two of these containers which are positioned and recharged alternatlely, as will be presently described in detai The die, ram and mandrel are mounted as usual in a massive framework, comprising a rear frame block 5, and a front frame block (not shown), which blocks are connected together and maintained in fixed spaced relations by fourheavy tie bars 5*.

Upper and lower guiding flanges 6 and 7 project forwardly from the front face of the rear frame block, and are formed in their inner sides with guiding grooves 6 and 7, which flanges are adapted to receive between them, and act as guides for,'the containers 4 in the positioning of the same alternately in horizontal operative relation to the die, mandrel and ram, the upper and lower sides of the containers being formed with flat faces to fit between the guiding flanges, and being further provided with ribs 8 to enter the guiding grooves 6 and 7 a in said flanges.

As best shown in Figs. 1 and 3, when the container is positioned between the flanges and in operative relation to the die, etc., the die projects a slight distance into the front end of the container, and in order to admit of the movement of the container into and out of operative position, the die is adapted to be moved forwardly to a limited extent axially of the container in order to clear the rear end of the latter; and in the operative position of the parts as shown in these figures, the central horizontal longitudinal axes of the die, the container, the ram and the mandrel, are coincident with each other and disposed in the true line of extrusion.

Horizontal guideways 9, 9, extend laterally in opposite directions from the respective ends of the lower guiding flanges 7, and form continuations of said flanges, and onto said guideways the containers-in horizontal position are adapted to be moved when positioning them into operative relation to the die for the extrusion operation, and in removing them from the die for recharging; and supporting devices, in the form of cradles 10, are arranged at the ends of said laterally extending guideways to receive the respective containers from said guideways, which cradles are adapted to be rocked to turn the containers supported therein to upright charge-receiving positions.

As the two cradles are identical in construction and operation, being duplicated on opposite sides of the .press to handle two con tainers alternately, a detailed description of one will suflice. As best shown in Fig. 6, the cradle consists of a frame provided with upper and lower guiding flanges 11 and 12 having grooves 11 and 12 therein, similar to the grooved flanges 6 and 7 of the rear frame block 5; and with the cradle in horizontal receiving position, the lower horizontal flange 12 thereon will be in register with and form a continuation of the laterall extending guideway 9, so that the contalner may be moved directly into the cradle from the guideway and will fit in between the flanges of the cradle, with the ribs of the container seated in the grooves in said flanges.

The flanged frame of the cradle is rotatably mounted on a suitable fixed bed frame 13 in such a manner that the cradle frame may be turned through 90 from its horizontal receiving position, to a vertical position as shown in Fi 7, thereby to turn the container to an u rig t position to receive its molten 5 metal c arge. This mounting of the cradle frame is efi'ected, in the present instance, by fixing to the said frame at its opposite sides, two segmental racks 14 which mesh with and are supported by two airs of vertical pinions 15 journalled in the ed frame 13, whereby the cradle is rotatably sustained by said pinions and may be rocked, either manually or by power, through 90 in turning the container to an upright position for recharging, and in returning the container to a horizontal position preparatoryto again moving the same along the horizontal guideway 9 in again positioning the container for the extrusion operation. The container may be moved along the guideway 9 and into the cradle in any suitable manner, but as a preferred means for this purpose, a power cylinder 16 is fixed on a suitable support at the outer side of the cradle and containsa piston 17 having connected .With it a piston rod 18 which extends between the flanges of the cradle frame and has its inner end pivotally connected with the side o f -the container as at 18 as best shown in Figs. 1 and 2. 'By the admission of fluid under pressure to the cylinder respectively on opposite sides of the piston (which may be accomplished by controlling valve mechanism well known in the arts and not necessary here to illustrate), the piston may be stroked outwardly and the empty container thereby moved from its operative position onto the cradle, or the piston may be stroked inwardly and the container, after l0 receiving its new charge, may be moved out of the cradle and back to operative position for the next extruding operation, the turning of the container to upright position within the cradle, notwithstanding the conl6 nection of the latter with the piston rod, be-

ing permitted bythe turning movement of the piston within its cylinder.

When the empty container held in the cradle is turned to upright position as shown 0 in Fig. 7 molten metal is poured into the same, for instance from a suitable ladle 19 to recharge the container; and in accordance with the present invention and as before explained, a mandrel centering bore A is formed 5 1n the charge or billet B, by inserting a bore forming core 20 into the empty container before the molten metal is introduced, and withdrawingsaid core after the charge has more or less solidified; This core as shown 0 in Figs. 6, 7 and 8 is of tapering form, so that it may be the more readily withdrawn from the cooling metal mass, and it is mounted to slide back and forth through a guiding hole 21 inthe side of the cradle frame, which 5 hole, when the container is positioned inthe cradle, will be in alinement with the longitudinal center of the container. At its outer end, the core is connected with a crosshead 22, which is connected with the forward ends of actuating piston rods 23 connected in turn with pistons 24 in tpower cylinders 25 fixed to the outer sides 0 the flanges 11 and 12 of the cradle frame. By the admissionof pressure fluid to the cylinders respectively on o posite sides of the pistons (which may be e ected by suitable valve mechanisms not necessary to here illustrate, since they are well known in the art), the pistons may be stroked inwardly to project the core into the container held in the cradle, or they may be stroked outwardl to withdraw the'core from the charge or bil et.

As shown in Fig. 8, the length of the core 20 is such that when fully seated in the container, its free end will project a short distance beyond the open end of the container, so as to insure that the metal charge will not cover the end of the core and thereby close the end of the bore therein.

As shown also in Fig. 8, a closely fitting follower block 26 is seated in the bottom of the container before the molten metal is poured in, and is rovided with a central hole through which t e core slides, the purpose of which is to afford an abutment surface for the ram in exerting its extrusion pressure on the billet, whereby the ram without a close fit in the container is enabled to exert its full pressure throughout the cross sectional area of the billet.

It will be understood from the foregoing description, that the two containers are'operated alternately in positioning the charged container for its extrusion operation, and in removing the empty container from the extrusion position to its cradle for recharging, the empty container being recharged while the billet is being extruded from the other container. This method of operation conserves much time, and increases the capacity of production, and is' therefore a feature of im ortance and advantage.

he operation of the mechanism in the practice of the invention is as follows: It is assumed that the billet has been extruded from the container shown in Fig. 1, thereby leaving the container empty, and that the ram and mandrel have been retracted for the next extruding operation. The extrusion die is first moved rearwardly to disengage the container, and the latter is shifted along its guideway 9 in horizontal position by the op eration of its piston 17, and entered in the cradle which was previously set in a receiving position with itsbore forming core retracte'd. The container being thus seated in horizontal position in the cradle, it-is fastened in place by suitable means 'to prevent its displacement, and the bore forming core is stroked inwardly by the operation of its pis' tons 24 and thus positioned in the center of the container, it bein understood that previous to the seating o the core, or before the metal change is introduced the follower block 26 is placed in the bottom of the container as hereinbefore described. The cradle is now rocked 90 from its horizontal receiving position, thereby turning the container to upri ht charge receiving position as shown in F ig? 7 Molten metal is now poured into the container so as to fill the same just short of the end of the core, as shown in Fig. 8, and when the charge has partially solidified into the billet B, the cradle is rocked back to its former horizontal position, and the core then stroked outwardly and withdrawn from the billet, as shown in Fig. 9, thereby leaving in the billet the mandrel centering bore A, before alluded to. The charged container is now moved in horizontal position out of the cradle and along the guideway 9 by the operation of its piston 17 and positioned in line with the die and mandrel, as shown in Fig. 10, ready for the extrusion operation, and the die is engaged in the forward end of the container and abutted against the end of the billet. The mandrel 3 is now advanced through the follower block 26 and the bore in the billet, and its end entered in the die as shown in Fig. 11, the engagement of the mandrel in the bore of the billet (which bore is accurately centered, due to the casting of the billet directly in the container and around the core), acting to center the mandrel with extreme accuracy within the opening in the die. In this way, there is formed between the exterior of the mandrel and interior of the die, an annular extrusion space C of equal and uniform width throughout its circumferential extent, as shown in Fig. 11. Finally the ram 2 is advanced, and engaging and pushing the follower block before. it, the billet is subjected to extrusion pressure and the metal is extruded throu h the extrusion space 0 in the form of tubingi), whose bore is truly concentric and whose walls are of uniform and equal thickness throughout its longitudinal and circumferential extent.

After all of the metal has thus been extruded, the ram and mandrel are retracted, and the die moved forwardly to disengage the container, and the latter is again moved along the guideway 9 and into the cradle and recharged, as above described, during which recharging operation the other container (which had been charged during the extrusion operation just described) is moved into operative relation to the die, etc., and the metal extruded therefrom as in the previous operation. 7

The container when in extrusion position is held by suitable means against accidental displacement, in the present instance by means of a vertically movable latch pin 27 mounted in a guideway inthe upper flange 6 of the frame block 5, the lower end of said pin being rounded to seat in a rounded cavity in the upper side of the container. The relation of the cavity to the central axis of the container and the true line of extrusion is such that when the pin is engaged in the cavity, the axis of the container will be in alinement with said line of extrusion, and consequently in line with the axes of the die, ram and mandrel. The latch pin is controlled by fluid pressure means by being connected with a piston 28 in a cylinder 29 supplied with fluid under pressure from a suitable source through pipes 30 and 31 entering said cylinder respectively on opposite sides of the piston. By means of suitable valve mechanism not necessary to illustrate or describe, the pressure on the latch pin may be so controlled as to hold the same firmly engaged with the container while the extrusion operation is in progress, and to permit the container to be automatically engaged with or disengaged from the latch pin in positioning the container for the extrusion operation and in removing the empty container therefrom, the rounded end of the pin admitting of such automatic action.

While in the foregoing description and accompanying drawings the invention has been set forth in the particular detailed form and method of procedure which have been found to answer to a satisfactory degree the ends to be attained, it will be manifest that these details may be variously changed and modified without departing from the spirit of the invention; and it will be understood that the invention is not limited to any particular form or construction of parts, or in respect .to the method of procedure, except in so far as such limitations are specified in the claims.

Having thus described my invention, what I claim is 1. The method of extruding tubing, which consists in casting in a container a heated billet with a mandrel centering bore, supporting the container in operative relation to an extrusion die, and a mandrel, inserting the mandrel in the bore of the billet and thereby centering the mandrel relative to the die, and acting on the billet to extrude the metal through the die and around the mandrel.

2. In the method of extruding tubing, introducing molten metal into a container around a bore forming core, permitting the metal to more or less solidify to form a billet, withdrawing the core from the billet to leave a mandrel centering bore therein, inserting a mandrel within the mandrel centering bore to permit extrusion of the tubing.

3. In the method of extruding metal tubing, turning the container to an upright position while removed from the extrusion die, inserting a bore forming core into the container, filling the container around said core with molten metal, permitting the molten the extrusion die, inserting a mandrel into Core metal to partially solidfy, withdrawing the leave a mandrel centering bore said charge, moving the container in operative relation to said bore in the metal charge, and subjecting the metal char .to pressure to extrude the same through t e die.

relation to the extrusion die,

-4. In the method of extrusion, turning the container to an upright position while removed from the extrusion die inserting a bore forming core in the upright contamer, char the container with molten metal to surroun the inserted core, dpermittin the molten metal to partially soli 'fy, with rawing the core from the partially solidified char to leave a mandrel centering bore, turning the charged container to a horizontal position, and moving the same to operative inserting a mandrel in the centering bore in the metal charge, and subjecting the charge to pressure to extrude the same through the die.

5. The method of extrusion, which consists in employin two containers for the material to be extruded, positioning. said containers alternately in operative relation to an extrusion die, removing the empty containers alternatel from the die to receive fresh charges 0 container while material is being extruded from an operatively positioned container.

6. The method of extrusion, which consists in employing two containers for the material to be extruded, positioning said containers alternately in operative relation .to an extrusion die, removing the empty containers alternately in opposite dlrectlons from the die to positions for recharging, and charging an empt ing the material rom an operatively POSI- tioned containen, y

7 The method of extrusion, which consists in employing two, containers for the ma terial to be extruded, positioning said containers alternately horlzontally in operative relation to an extrusion die, removing the empty container alternately from the die and turning them to an upright position to receive fresh charges of material, and pouring molten metal in an upright empty container while the other container is horizontally positioned in operative relation to the extrusion die. 7

8. In an extrusion'press, the combination of an extrusion die, a container adapted to be removably supported in horizontal position in operative relation to the die, a reciprocating ram, means for movin the empty contalner transversely of the irection of movement of the ram to a point removed from the die, and a supporting device in position to receive the container, said device being movable to turn the container to an upright position for from the partially solidified charge to material, and charging an emptycontainer while extrud- 9. In an extrusion press, the combination of an extrusion die, anextruding ram reciprocatable to and from the die, a container for the material to be extruded, a support for the container between the ram and dle, a guideway extending laterally from the container support for t e movement of the container free of the die and ram, and a device at the end of the guideway to receive the container, said device being movable relative to the guideway to turn the container to an upright position for charging.

10. In an extrusion press, the combination of an extrusion die, an extrusion ram reciprocatable to and from the die, a movable container for holding the material to be extruded, a support for the container between the ram and die, a guideway extending laterally from'the support, a cradle at the end of said giudeway and power means operative on the container to move it along said uideway and onto the cradle, said cradle eing movable to turn the container to an upright charge-receiving position.

11. In an extrusion press, the combination of an extrusion die, rocatable to and from the die, movable containers for the material to be extruded, a support for the containers to sustain them alternatelybetween the ram and die, guideways extending laterally in opposite directions from said support, means for moving the containers back and forth on said guideways to respectively position the charged containers in operative relation to the die and ram, and to remove the empty containers for recharging, and means whereby said containers can be turned to upright charge-receiving positions at the ends of their lateral movements.

12. In an extrusion press, the combination of an extrusion die, an extrusion ram reciprocatable to and from the die, movable containers for the material to be extruded, a support for the containers to sustain them in horizontal position alternately between the ram and die, guideways extending laterally in opposite directions from said support on which the containersare adapted to be moved, cradles at the ends of the guideways to receive the horizontal containers respectively therefrom, fluid pressure cylinders, and pistons therein connected with the respective containers to move them alternately .along their guideways and into said cradles in horizontal position, said cradles being rockable to turn the containers to vertical position for rechargin 13. In an extrusion press, the combination of an extrusion die, an extrusion ram reciprocatable to and from the die,movable contain ers for the material to be extruded, a support for said containers between the ram and die, guideways extending laterally from said support, on which the containers are adapted to be moved free of the ram and die, and

cradles at the ends of said guideways to receive the containers, said cradles being movable to turn the containers to upright chargereceiving positions.

14. In an extrusion press, the combination of an extrusion die, an extrusion ram reciprocatable to and from the die, a container for the material to be extruded, a support for the container between the ram and die, a guideway extending laterally from the container support for the movement of the container free of the die and ram, a cradle at the end of the guideway to receive the container and movable to turn the container to an upright charge-receiving position, and a core carried by the cradle and adapted to be inserted in the container to form a centering bore in the metal charge.

15. In an extrusion press. the combination of an extrusion die, an extrusion ram, a mandrel associated with said ram, a container for the material to be extruded, a support for the container between the ram and die, a guideway extending laterally from the container support for the movement of the container free of the ram and die, a cradle at the end of said guideway in position to receive the container, said cradle being rockable to turn the container to an upright charge-receiving position, means for moving the container along said guideway and onto the cradle, a core on the cradle adapted to be inserted in the container while in the cradle and to be removed from the metal charge therein to leave a mandrel centering bore, and means for operating said core.

16. In an extrusion press, the combination of an extrusion die, a container adapted to be supported in operative relation to the die and removable therefrom for recharging, a device in position to receive the removed container and movable to support the same in an upright position to receive the charge of molten metal, a core mounted on said device, and means for operating the core to respectively insert it in and remove it from the supported container, thereby to form a centering bore in the molten metal.

17. In an extrusion press, the combination of an extrusion die, a container adapted to be supported in operative relation to the die and removable therefrom for recharging, a device in position to receive the removed container and movable to support the same in an upright position to receive the molten metal, a core movably mounted on said device for insertion in and removal from the supported container, and fluid pressure operating means on said device for actuating the core.

18. In an extrusion press, the combination of an extrusion die, a container adapted to be supported in operative relation to the die and removable therefrom for recharging, a device in position to receive the removed container and movable to support the same in an upright position to receive the molten charge, a core movably mounted on said device, a fluid pressure cylinder and piston therein, and connections between the piston and corefor operating the latter.

- 19. In an extrusion press, the combination of an extrusion die, a container adapted to be supported in operative relation to the die and removable therefrom for recharging, a device in position to receive the removed container and movable to support the same in an upright position to receive the molten charge, a core movably mounted on said device for insertion in and removal from the supported container, fluid pressure cylinders fixed to said device, pistons sliding therein, and a crosshead carried by the core and connected to said pistons to be operated thereby.

20. In an extrusion press, the combination of an extrusion die, a container for the material to be extruded, a support by which the container is held removably in operative relation to the die, a guideway extending laterally from said support on which the container is adapted to be removed from the die, a pressure fluid cylinder, a piston therein connected with the container for moving it along the guideway, and a cradle formin a continuation of said guideway to recelve the container therefrom, and rockable to turn the container to an upright position for recharging.

21. In an extrusion press, the combination of an extrusion die, a container for the material to be extruded, a support by which the container is held removably in operative relation to the die, a guideway extending laterally from said support on which the cradle is adapted to be moved free of the die for recharging, a cradle at the end of said guideway formed with upper and lower guides to receive the container from the laterally extending uideway, and means for moving the container along the laterally extending guideway and into the ides of the cradle, said cradle being rockab e to turn the container to an upright position for recharging.

22. In an extrusion press, the combination of an extrusion die, a container for the material to be extruded, upper and lower guideways between which the container is adapted to be removably supported in operative relation to the die, a horizontal guideway extending laterally from said lower guideway on which the container is adapted to be moved free of said die, a cradle at the end of said lateral guideway provided with upper and lower guideways between which the container is received from the lateral guideway, said cradle being rockable to turn the container to an upright position for recharging, and means for moving the container along the lateral guideway and into the guideways' on the cradle. V 23. In an extrusion press, the combination of an extrusion die, a container tohold the material to be extruded, a uideway on which the container is adapte to be supported in operative relation to the die, and releasable means acting on the container to hold it removably in said operative relation. 24. In an extrusion press, the combination of an extrusion die, a containerfto hold the material to be extruded, a guideway on which the container is adapted to 'be suported in operative relation to the die, means or moving the container on said guideway into and out of operative relation to said die, and a latch pin adapted to be interlocked with the container to hold it in osition, and being yieldable to permit 0 its automatic engagement and disengagement by the movement of the container.

25. In an extrusion press, the combination of an extrusion die, a container to hold the material to be extruded and-provided with a cavity, means for supporting the container in operative relation to the ie, a latch pin adapted when the container is in said osition to engage in said cavity and hol the container removably in position, a fluid pressure cylinder, and a piston therein connected with said pin.

In testimony whereof, this specification has been duly signed by:

CLAIR O. EVANS.

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