US1039234A - Pressure casting apparatus. - Google Patents

Description

5;. WETHERILL; Japan A. W. MORRIS.

PRESSURE CASTING APPARATUS.

APPLICATION FILED JULY 18,1911.

Patented ss m k 1912! 3 SHEBTS-8EBET 1.

INVENTDRSI was ATTURNEYS S. 3 WETHERILL, dm &'A. W. MQBLRIS.

v PRESSURE CASTING APIABATU? APPLICATION FILED Jun 18,1911.

- 1939,2341, I Rammed $9 3 24 2912;.

3 BHEETB-BHEBT 2;

J! g s I WSTNESSES: INVENTOR; 777. fl b ATTORNEYSi S. P. WETHERILL, J21. &' A. W; MORRIS. PRESSURE CASTING APPARATUS APPLICATION FILED JULY 18,1911.

Patented Seps. 2%, 2922.

3 SHEETS-SHEET 3.

mewmw WUEL'PEICE WETHEEKLEJ, 33., AND 2218s ii iimiss i- To all whom all may cmwem:

Be it known that We, SAMUEL PEI WETHERILL, J12, am ll. Messrs, citizens 0* the United States, both msiding at Philadelphia, county of Philfidlpl1i,.

Statc of Pennsylvania, have inventccl certain no. and useful improvements in sure Casting Apparatus; and we do cycle of operation the attainment of tacle containing the molten metal has a greater measure of uniformity in the recnrrencs of that cycle.

The apparatus herein described, angl illustratccl in the accompanying drawing 'isgnfitended for use in connection with sprsssnrc casting furnace of the type in which molten metal in :1 closed vessel is r' iscrl or otl1cr- Wise transferred into a mold through nozzle or uptake, by the srlmission of air under prcssureto the interior of the closed vessel. Hcretofore, the operation of mitting air unolcr pressure into the rec-cpbeen performed by thsdirect manipulation of valves. by the operator and has required considerable skill to effect the required cycle, for the molten metal must he quiot-ly misc-(l or transferred by low pressure into the mold until the mold is filled and must be held under compression tlisrcin'hy high pressure, until it sets. The admission of the air under pressure has been attended by serious di iculties, which occasioned many accidents and failures. Thus, when through thc lock of skill vor'the inadve rtcnce of the operator the air is brought abruptly in large quantity, into contact with the hot metal to raise it into the mold, the resulting expan sion occurs with a violence little short of an explosion, and When this occurs, the metal spurts into the mold in a divided stats and is chilled into an imperfect casting before any subsequent actionhv the operator can rectify the error. Furthermore, an iniitiaI disturbance of the metal by the resilient- LABELPTEMt, consuls,-

' i moltsr I is to draw out s While the a has been sure, and. by "valves flier-sf however, are isolr from one thev ssnssthat (ll-5;; mental l sings from his to the 0th nn'l, scoonclly, in mechanical fist-ice for opera which. is sclnpisols to any cyols of open lion {l or v i ssosratc co- In L which will 1 Apparatus snhorlyinc' the subject matter of the invention is illns rated in he par ing'tirswin s, in Which-- l guro l is a Iron't View, in elevation, a combined low pressure compressor. Volvo-operating clerics to lac use-cl in tion with csstingfn-rnscch 2 is a right-haul side View. insoi the apparatus shown in F .1. r a of? the actuating cam. s, 5 anal 6. are sectional views of the "val housing. form a part of the zippsrs illustrated in 1 anti and ow the threo'pii-incipal positions of the controlling:

I loosely mounted on this reduced the end of this concentric part air supplies. in elevation Fig. 1.

Similar letters of reference indicate simi-- lar parts thrcuighout the several views. Referring to the drawings, A ind a base casting upon which'thc machine assembled. A crank shaft. B journaled in bearings on the casting A and is provided with a worm gear I). A driving shaft 0 is journaled in hearings on the casting A and carries a worm c, which engages with the. worm gear b to drive,the crank shaft B. The extended end of the driving shaft C is reduced in diameter and is supported in a floor bearing 0, and a driving pulley D is ort'ion beie shaft C Fi 7 is a lefthand side view, o the apparatus shown n tween the shoulder formed on t and the inner face of bearing 0.

A cam shaft E is mounted in hearings in the base casting A parallel with thecranlt shaft B and is geared to run synchronously with the crank shaft Bthrough the medium of a spur gear 7), fast on crank shaft B, and a like spur gear 6, fast on the cam shaft E. p Y

A cam wheel F is mounted fast on one end. of the cam shaft E and has a cam groove f in its outer face, which is designed to direct the movement of a clutch actuator G by the engagement with said groove of a pin 9, mounted to reciprocate in the actuator G and normally spring-pressed into engagement with said groove. The clutch actuator G has the form of a yoke and engages an annular groove in a clutch member a, which is splined to the driving shaft C and which is designed to be moved into and out of engagement with a complementary clutch member of on theinner face of the driving pulley D, to respectivelyconnect and disconnect the continuouslyrunning driving pulley D and the driving shaft C. greater part of the groove f in cam Wheel F is concentric with the cam shaft E and when the pin 9 on the clutch actuator G is engaged in this part, the clutch members 0' and (Z are interlocked, the driving pulley D drives the driving shaft and the machine is in operation; but, when a deflection f at of-the groove f moves the pin g, the clutch members 0 and a are separated by the movement of the clutch actuator G and the machine stops automatically; It will be seen that this automatic stopping of the machine must occur at the end of each revolution of the crank and cum shafts B and E. The machine started 11 )on a subsequent revolution (after it has on stopped through the engagement of pin g with the deflection. ,f in groove ,1) by a hand lever g, pivoted on the clutch actuator G,end' connected with the draw the ping' enin 9, serving with p tire y from the f, (bile a movbnmnt The i being projected l icates peripheral arcs corre:

u. l in this poll t ion, until the udvance oi the the flotation j in groove f tulmits of the pin 5] 1y its spring into the concentric part of the groove f. A. cam-holding plate 11 is mounted :t'ast on the opposite end of cam-shaft E and is provided with a, cir cular series of equidistant pcrtor-itions. Two cams l1 and ll, of greater diameter than the cannholding plate H, are each recessed to fit; the periphery of and extend over the canrholding plate H to abut one another when placed upon opposite sides of said plate, and each of these cams is rovided with a circular series of perforations exactly registering with those in the camholding plate H, in such'manner thatthey may be, bolted to that plate in various positions relative to one another and to that plate. The cams h and it. have like low Q ending to the lowest position to be assumed hy the member to be actuated by them, and'the cam 11 has a high peripheral are corresponding to an intermediate position of that member, while the high peripheral are of. the cam it corresponds to the highest position to which the actuated member is to be moved.

An uprightcylinder I is mounted upon the base casting A, and a piston i is actuated in said cylinder by the crank shaftB through connecting rod 1 I B timed to be at its lowest position (and the piston 17, therefore, at the lower end of its stroke) when the machine is automatically stopped, and the piston 21 consequently makes one u and one down stroke during each cycle ofthe machine.

A valve chamber J mounted 11 top of the cylinder I and. contains eating valves whose nected to one arm of a bell crank K. The other arm of bell crank K is connected to a O pen the reciprocommonstem is conreciprocating rod is having, upon its lower end, a roller k which traverses the cams h and h on cam shaft E. Through this last described mechanism, the cams h and h effect the movement of the valve in valve chamber J. The only passage to or from cylinder I, is port L see F 1g. 4) leading into the valve chamber J. The valve stem j carries all of tho-valves, one of which, (namely, a valve M) inthe first position of the valves shown in F ig. 4, opens communication between the-port L and a relief port N to atmospherafland, in this osition of the valve stem theport L isle so in communication with a chamber 0 from which a pipe 0 leads to theclosed molten metal receptacle of the pressure. casting furnace. In t is first position of the valvos, a second valvecloses ctfinmunicatismliotwan the 0 and, pnular ,whiei is.

The crank of crank-shaft to effect successive similar cycles of movement of said valve; substantially as de scribed.

2. In pressure casting apparatus of the character described, the combination with the chamber containing the molten. metal, of a valve for admitting com rcssed air thereto and automatic power riven mechanism ogeratively connected with said valve to e ect a predetermined cycle -of operation of said valve, said mechanism being adapted to be manually started and automaticall stopped at the expiration of said cycle; substantially as described. T

3. In pressure casting apparatus of the character described, the combination with the chamber containing the molten,metal,' of separate sources "of'air under low pressure and high pressurerespectivel and means whereby communication ma established between said chamber and t esource of air under low pressure, and subsequently between said chamber and the source of air under high pressure; substantially as. described.

4. In pressure casting apparatus of the character described, the combination with the chamber containing the molten of separate sources ofair under low ressure and high pressure, res ectively, an 00- operating valves associate to first establish communication between said chamber and the source of air under low pressure, and to then out 01! said communication and simultaneously establish communication between said chamber and the source of air under high pressure; substantially as described.

5. n pressure casting apparatus of the character described, the combination with the chamber containin the molten metal, of a cylinder, a piston therein, means for reciproca'ting said piston, and a valve actuated by said means to effect communication between said chamber and ing a certain portion of the travel of said piston, and to effect communication between said cylinder and the atmosphere through out the remainder of the cycle of said piston; substantially as described.

In pressure casting furnace of the character described, the combination with the chamber containing the molten metal, of a cylinder, a piston therein, means for rec1 procating said piston, by said means and adjustably connected thereto to effect communication between said chamber and said cylinder during any detravel of said piston and to effect communication between said cylinder and the atmosphere throughout the remainder of the c stantially as descri ed.

In pressure casting apparatus of the character described, the combination with cle of said piston; subt-he chamber containing the molten metal, of

jdesired portion of the travel I to effect communication between said cylinder and the atmosphere throughout the metal, character described, the-combination with the chamber containing the molten metal, of a source of air under high pressure, a second source of air a valve adapted to effect as no munications between said 0 amber and each of said sources of air under pressure, said valve being designed to close the conduit from said source of air at two points and open a relief port to atmosphere to intercept leakage from said source ;of air at high her or into said source of sure; substantially as described.

said cylinder durand a "valve actuated .inder, a piston therein,

able and automatically stopping mechanism operatively connected to said piston to reciprocate the same, and a valve actuated by said mechanism and adjustably connected thereto to etfect communication between said chamber and said cylinder during any of said piston,

remainder of the cycle of said piston, and

y .to exhaust said chamber to the atmosphere .while said mechanism is at rest; substantially. as described.

8. In pressure casting apparatus of the character described, the combination with ;the chamber containing the molten metal, of a source of air under fa valve adapted to effect tween said chamber and .under high pressure, and communication be said source of air ressure when in one position, and

in anot er posit-ion to close said communication at two points and open a relief fport to' atmosphere to intercept leakage rom said source of air at high pressure into said chamber; substantially as described.

9. In pressure casting apparatus of the under low ressure, and

ronous comhigh. pressure at pressure into said chamair at low pre- 10. In pressure casting apparatus of the character described, the wmbination with the chamber containing the molten metal, 'of

,a conduit leading thereinto, a source of air under hgh pressure supplying said conduit, and a valve governing the passage of the stantially as described.

11. In pressure casting apparatus of the character desbribed, the combination with the chamber containing the molten metal, of a source of air under high pressure, a cylmeans forreciproeating said piston, and a valve operatively connected with said piston and arranged to afl'ord communication at different times between said chamber and said cylinder and between said chamber and said source of air under high pressure; substantially as described, 1

12. In pressure casting apparatus of the character described, the omnbhiation with a cylinder, a piston therein, manually starti high pressure air through the conduit at two points and likewise governing a leak:

relief port intermediate of said point-s; su

int

I ofQa source of air under high pressure, a

'c linder; a piston therein, manually starta 1e and automatically stopping mechanism operatively connected to said piston to reciprocate the same, a valve actt rted by said; mechanism and adjustably connected thereto, to ait'ord communication between said furnace and said cylinder during any desiredortion of the travel of said piston, to aflo'rd communication between said cylinder and the atmosphere throughout the remainder of the cycle of said piston, to afford communication between said furnace and said source of air'under during. an desired part of said remainder of the eye e of said piston, to close said last named communication at two points and open a leakage relief port therebetween, and

to exhaust said furnace to the atmosphere while said mechanism is at rest; substanv tially as described.

In testimony whereof we afiix our signatures, in'presence of two witnesses.

SAMUEL PRICE wnnmnnit, In. ALBERT W001) MORRIS.

Witnesses:

1 F. J. Kme, .'C. W. Fonamnenm.

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