US2478657A - Die casting machine - Google Patents

Description

Aug. 9, 1949. E. A. GLYNN DIE CASTING MACHINE 3 Sheets-Sheet 1 Filed Nov. 6, 1946 WV. N MW 9v Q Q Q m w ow m m hwy mm mm mu mm mm m NN Qm NN mmm w mm INVENTOR EH. Glynn ATTORN EYS 9, 1949- E. A. GLYNN 2,478,657

DIE CASTING MACHINE Filed. Nov. 6, 1946 {Sheets-Sheet 2 m "a Q g t a h m y m a m t Q v N Q 1% I m 0 N m R N INVENTOR EA.GZynn Q M M T ATTORNEYS Patented Aug. 9,1949

' U NiTE B STAT-E55 PATENT GFF- l CPE um @AS'TING :Edwin a, hit-am, moat pant, assignor tt s er Mold floi'poration of California, Lodi, Calif. Amman-"November 6, 194B, seriai'No. 708;1 r1' 1 This invention is directed to -"a' rieeeeae meiSiiine Tor the tire tread design on matrix lt'laziks tar tire =retreeding or'reeapeine ap- 'pa-ra ttis the tresent iri e'ntlbfi rp'r e'sfitmg movements on the tie-eastmemaenme shown in United States *Patentwo. 13989338. V

--one object of "the invention is to prbvide a -clie casting maritime, er the type described, wherein the tire tread designz-is-zcastmnto the matrix blank sectionally as before, but here withgreater ease, raster, and With more safety to the operators.

Another object of "the present invention is to rovide a die *castingma'ehine, as ram-wherein the die block newer actuated to: the iputhose or quickly advancing ft thwart and away .Irbm the matrix, and itb maintain such the block .in inositive fcontact during the tr ating operation.

further object of the invention is th provide a novel mount for the matrix blank arranged ffor ease ti movement eff fs'a'id firan'k to and from the eastmg platform; fer bf the :matrix blank step by step the -se'eti'oital tasting eperations; "and for-tilting off the matrix iblar'ikupwardlyon the sideadjahent platform "to such blank away the "metal remaining in An additional "dbject *oir th'rsinventibn-iis to provide at-safety sy tem arranged ?'to minimize the possibility are, the tasting operation being"starteii, accidentally, before the die 15161251: is 1h ipiis'itfdn fol-use.

A further tweet thelinvfentionisite 'iarnduce a practical :iiie tasting mahinefwhidh will be highly efiective Ibr the jiurpoisefor "which it is d si' fi I r These obire'c'ts are aecnm iifshed by means bf "suc'h structure and relative 1 fhairts as will "fully *appe'arhy fa perusal tithe following specification and claims.

Inth'e drawings:

'1 a side lemtioh JOY *the iiiii'p'irbvcd Hie tasting machine. 7 I

Fig. 2 is a sectional "elevation itnereo'r.

.F'i'g. 3 its a fragmentary plan View of themower atituatedyoke assembly extracted to advance and retract "the cue block, and to 'inaih'tain said .die block, during a casting nperationin positive con- 'tact with fhematfixiblaiik; I

Fig. i4 is .a Ztraginentary rend elevation of the niount .for thelchuck which-supports :thezmatrix b 9.111;. 1

Fig. 5 is=ah1an view, detached, of the ichuck .for themat'riik-hlank. d

Referring now more artixiularhr to the characters of referencehn thedrawings, itheiimpreved die-casting machinecompnses a :base :I having an upstanding frame 22 thereon, such 2 sup- ;porting a verticalfirebox *3 having burners or flame jets l red i'a ituel time 5.

A melting not 6 depends amortized-matrix its upper end, and cat ith'e'tbp the imeltingt-pot -16 in'cmdes-a-removahIe ihut hormallyilbckedicover "I, by means of which die casting .rnetalmay hesintrtdueediintesaidnot.

4A vent foriflue 2'8 leadsffrom the firebo'xfi at the top thereof. The l-machine includes :a pyrometer *9 having a icontroi line JD f.1eading:.into the melti-ng' pot 6, whereby "the temperature within the "latter :is accurately :indicate'd exteriorl'y of the machine.

At the "top, land :at :one side thereof, the :firehox 2 supports a horizontal platform ll, having an foutwarlilyzfia'cmg concave back wall .12.

, the :meiting' 150 t 6 upwardly thrnu'gh the top thereof, and opensithroug hzthe backw'ail {2; the lporti on :of the time 13 radfjacent said back wall dieing iormed in adjacent :relation to :a heating nhaznb'er EM integral with :said sidewall, heated Ifrom ihe firebox- 3 Ari-zany suitable :manner, as by a passageway 5125. The heating :zihamider is as at 126.

:Fluid hie oastin metal, :from theimelting "not 6, can ibfe iiforcefully discharged throu'th the reed :13 by means-15f :air under pressureiintro'duced :into said melting put by a-conduit flr'l which textends from-ia source (not shown) iofair pressure. at valve 18 is interposed in the conduit IEI and inzilndesa control shaft 19 having 1a handle 20 on one end thereof. .Tn-oneiposition .o'f th'e ihanflle ill airiundenpressure delivered'tononduit :I (,uihile in another j-position the fair is vented -through an butletll.

The shaft l9 .andhandlefllareinormallymaintainedin position with the valve 1I-8 vented ithroug'h outlet 2-1., and this .is accomplished :hy means :of a solenoid 22, whose plunger 23 inormally :errga'ges in alockingseat :24 "in said shaft 48. The solenoid :22 is interposed in a n'ormall'y open control circuit :25 which includes a signal :light 26 adjacent the station for the operator of the :handle 20, While a normally open :switch 21 :is includedin said circuit at adjacent the station for the operator who attends to positioning of the die -b1ock,-as;Wi1l hereinafter appear.

outwardly of the horizontal platform Llythe machineinchides an adjustable spider chuck, in- \dicated generally at 28, for :an annular .matrix "such assembly being operated by an 'iipstanding she-ft carrying a hand wheel '36 on its upper end. When the die casting machine is lhusethe 3 annular matrix blank 29 is supported, in internally clamped relation, by the chuck heads 30 in the manner illustrated.

The above described adjustable spider chuck is turnably mounted on an upstanding boss 31 which projects into a matching bore in the hub 33, and said boss is fixed on a transverse rocker shaft 38. The rocker shaft 38 is mounted, at opposite ends, by means of goosenecks 39 to a cross beam 49 having depending end posts 4| threaded through hand wheels 42.

The depending end posts 4| extend downwardly into tubular legs 43 connected at the top by a cross beam 44, and the hand wheels 42 bear against said cross beam from above, whereby rotation of such hand wheels effects vertical adjustment of the posts 4| for the purpose of leveling the spider chuck 2B.

The legs 43 are connected adjacent the bottom by an axle 45 having wheels 46 which run on a pair of transversely spaced, horizontal tracks 41. The legs 43, connected together as described, thus provide an upstanding, horizontally movable frame, indicated generally at 48, which movement is in a direction lengthwise of the machine, i. e. in the direction that the concave back wall l2 faces.

Such movement of the frame 48 is guided y guide rods 49 which extend horizontally from the legs 43 through guide sleeves fixed on the upstanding frame 2, as clearly shown in Fig. 1.

A die block 5|, of limited segmental extent, is formed with an arcuate workin facehaving a tire tread design 52 cut therein; such die block being adapted to engage the matrix blank 29, in matching relation, on the inner face of the latter.

The annular matrix blank 29 is drilled about its entire circumference with a plurality of sets of ducts 53 adapted to establish communication between the upper end of the feed pipe l3 and the design 52 on the die block, when the adjacent portion of the matrix blank 29 is seated on the platform H and clampingly engaged between the matching concave back Wall |2, and die block 5 I, in the manner shown in Fig. 2.

The horizontal platform II, with the upstanding concave back wall l2, and the cooperating die block 5|, form what may be termed the Work supporting and casting assembly.

The matrix block 5| includes a guiding handle 54 by means of which an operator guides said block to proper position for engagement with the matrix blank, but movement of such block and its positive contact with said matrix blank is accomplished by power means as follows:

The die block 5| is fittted with a rigid shank 55 which extends at an upward and inward incline relative to the axis of the spider chuck 28, and a post 56 is fixed in connection with and depends through said chuck to a termination therebelow. The post 55 is included in a yoke assembly, indicated generally at 51, which straddles the firebox 3 and extends to a'termination on the opposite side of said firebox from the platform The yoke assembly 51 comprises, with said post 56, a pair of rearwardly diverging arms 58 which connect, at opposite ends, with downward extensions 59 on the upper ends of a pair of transversely spaced, inclined side rods 60, which side rods are connected, at their outer ends, by a cross head 6|.

Intermediate their ends the side rods 60 run through guide sleeves 62 fixed on opposite ends of a cross shaft 63 journaled in brackets 64 on the firebox3.

A fluid pressure actuated power cylinder 65 is fixed in connection with the cross shaft 63 and Projects toward the cross head 6|; said cylinder including a piston rod 63 connected to such cross head.

The angular position of the yoke assembly 51 is adjusted, in order to set the correct elevation of the die block 5|, by means of a segmental gear 61 on the cross shaft 63 in mesh with a worm pinion 68 on a shaft 69 turnably mounted in connection with the firebox; said shaft having a hand wheel 1|] on its upper end. By adjusting the hand wheel 10, the cross shaft 63 is rotated to change the angle of guide sleeves 62, and consequently the working or angular position of the yoke assembly 51. 7

Movement of the die block 5| toward or away from the annular matrix blank 29 is accomplished by operation of the power cylinder 65,which is of double acting type, as shown.

The cylinder is included in a fiuid pressure system (not shown), valve controlled by the operator who manually guides the die block.

Operation In operation of the above described die casting machine, an annular matrix blank 29 is first clamped in the spider chuck 28 and then the movable frame 48 is shifted in a direction to engage said annular matrix blank 29 against the concave back wall |2 in matching relation; said matrix blank then seating flush on the platform II by reason of proper adjustment of the depending end posts 4|.

The post 56 of the yoke assembly 51 projects upwardly through the matrix blank 29 and supports the die block 5| within said blank.

As guided by the handle 54, the die block 5| is brought into positive matching engagement with a segment of the matrix blank 29, with the design 52 in matching relationship to one set of the ducts 53 as formed in said blank in circumferential relation. This positive contacting of the die block 5| with the matrix block 29 is efiected by operation of the power cylinder 55 in a direction to advance the piston rod 65, which imparts a like motion to the yoke assembly 51.

With the die block so contacting the matrix blank the operator, who guides said block to position, then closes the switch 21 which is adjacent his station. When this occurs the signal light 26 is illuminated and the solenoid 22 energized, causing the plunger 23 to retract from the looking seat 24 in the shaft l9.

Thereafter the other operator who is adjacent the handle 20 turns the latter so that air under pressure delivers through the conduit |1 into the melting pot 6, creating a pressure in the latter. When this occurs molten or fiuid die casting metal is forced from the melting pot upwardly in the feed pipe I3, and into the ducts 53 and tread design 52. I

The above die casting operation is repeated, step by step, about the entire circumference of the matrix blank 29 until a continuous and unbroken tread design is formed on saidblank. Q

Between each of the segmental die casting operations the die block 5| is of course released from the matrix blank 29 by reverse operation of the cylinder 65, and with the die block 5| so released, the blank 29 is tilted upwardly from the platform so as to efiect a breaking away of any metal adherent between the ducts 53 and the feed pipe I3. This tilting or canting of the matrix blank 29 is accomplished by swinging the spider chuck 28 about rockershaft 38 as an axis. 1

The step-by-step turning of the matrix blank 29 may be accomplished either by rotating the chuck 28, or by loosening said chuck and rotating said blank thereon; it being obvious that the full extent of rotation cannot be obtained solely by turning the chuck, for the reason that the post 58 projects between the spider arrangement of the guide rods 32 of said chuck.

Breaking away of the matrix blank 29 from the platform II and back wall 12, after each segmental die casting operation, is facilitated by a pusher block 1| on the yoke assembly 51, which pusher block engages the matrix blank and urges the same upwardly when said yoke assembly is shifted by the power cylinder in a direction to retract the die block 51 from its working position.

From the foregoing it will be readily seen that there has been produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described the invention, the following is claimed as new and useful, and upon which Letters Patent are desired:

1. A machine for die casting tread designs on a preformed annular matrix blank, comprising a frame, a matrix blank support and tread design casting assembly mounted on the frame, said assembly including a segmental die block adapted to matchingly engage the matrix blank, means mounting the die block for movement between a position free of the matrix blank to a position in positive contact therewith, said means including a member adapted to extend into the matrix blank, the die block being fixed in connection with the member, a fluid pressure actuated power cylinder mounted in connectionwith the frame, and actuating means between the cylinder and member arranged to cause movement of the die block between a position free of the matrix blank to a position in positive contact therewith; said actuating means including a cross shaft, a sleeve radially mounted on the shaft, a rod slidable through the sleeve, the rod actuating said member, and means to adjust the relative position of the shaft and sleeve and correspondingly the working position of the die block, the power cylinder being attached between the shaft and the rod,

2. A machine for die casting tread designs on a preformed annular matrix blank comprising an upstanding frame, a matrix blank support and tread design casting assembly mounted on the frame, said assembly being adapted to support a circumferential portion of the matrix blank with the axis of the latter generally vertical, a die block included in said assembly, means mounting the die block for radial movement within the matrix blank between a retracted position free of said blank to an advanced position in positive contact therewith, and a fluid pressure actuated power cylinder operative to effect such movement; said mounting means including an actuating yoke extending radially away from the matrix blank below the same, said yoke having spaced, parallel side rods, a cross shaft supported from the frame, guide sleeves radially mounted on opposite ends of the shaft, the rods slidably projecting through the sleeves, a cross head between the rods in spaced relation to the shaft, the power cylinder being connected between the shaft and cross head, a post on the yoke extending into the matrix blank and supporting the die block, and means to adjust the rotative position of the shaft so as to correspondingly vertically adjust the die block.

3. A machine for die casting tread designs on a preformed annular matrix blank comprising an upstanding frame, a firebox mounted on the frame and enclosing a melting pot, a matrix blank support and tread design casting assembly mounted on top of the firebox, said assembly being adapted to support a circumferential portion of the matrix blank with the axis of the latter generally vertical, a die block included in said assembly, means mounting the die block for radial movement within the matrix blank between a retracted position free of said blank to an advanced position in positive contact therewith, and a fluid pressure actuated power cylinder operative to effect such movement of the die block; said mounting means including an actuating yoke extending radially away from the matrix blank below the same and straddling the firebox, the yoke having spaced, parallel side rods, a cross shaft supported from the firebox, guide sleeves radially mounted on opposite ends of the shaft, the rods slidably projecting through the sleeves, a cross head between the rods in spaced relation to the shaft, the power cylinder being connected between the shaft and cross head, a post on the yoke extending into the matrix blank and supporting the die block, and means to adjust the rotative position of the shaft so as to correspondingly vertically adjust the die block.

4. A power operated means for moving a die block into conformity with the inner face of an annular matrix blank, such means comprising in combination with the die block a substantially vertical post, a shank fixed on the upper end of the post, the block being engaged by the outer end of the shank, a pair of diverging arms rigidly attached to the lower end of the post, guide rods connected with the outer ends of the arms, a support, a pair of spaced sleeves secured on the support, the guide rods being slidably mounted through the sleeves, a cross head on the outer end of the guide rods, a power operated power jack connected to and extending between the support and cross head means mounting the support for rotation and means to controllably rotate the support.

5. A structure as in claim 4, in which said last named means comprises a worm gear fixed on the support concentric with the axis of rotation thereof, a worm engaging the gear and a shaft on which the worm is mounted journaled in a fixed position and having a hand wheel thereon.

EDWIN A. GLYNN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 231,499 Ried Aug. 24, 1880 421,247 Cook Feb. 11, 1890 1,662,750 Kaufmann Mar. 13,1928 1,989,438 Woock et al Jan. 29, 1935 2,173,377 Schultz et a1 Sept. 19, 1939 2,225,273 Jacobs Dec. 17, 1940 2,268,949 Lehmann Jan. 6, 1942

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