US2383349A - Glassware working apparatus - Google Patents

Description

Aug; 21, 1945. E. E. SLICK GLASSWARE WORKING APPARATUS 5 Sheets-Sheet 1 Original Filed Feb. 17 1936 INVENTOR Aug. 1945 E. E. SLICK GLASSWARE WORKING APPARATUS 5 Sheets-Sheet 2 7 Original Filed Feb. 17, 1935 INVENTOR Aug. 21, 1945. E. E. SLICK 4 I GLASSWARE WORKING APPARATUS ori inal" Filed Feb; 17, 1956 V 5 Sheets-Sheet s a I: l

MUM v L Aug. 21, 1945. E. E. SLICK GLASSWARE WORKING APPARATUS Original Eiled Feb. 17; 1956 5 Sheets-Sheet 4 2% MJW Aug. 21, 1945. E, E. SLICK- GLASSWAREWORKING APPARATUS Original Filed Feb. 17, 1936 I s'she ts-sneet 5 MAM simplifies EQliltIGLy I I .1.A, stilliurther object otmy invention has been .to provide an article forming machinewhich is Patented Aug. 21, 1945 2,383,349 I I GLASSWARE WORKING APPAR TUS" Edwin E. slick Pittsburgh, Pa. Continuation of application Serial No. 64,227,

February 17, 1936. This 1940,, Serial No. 337,545 (CL 49-5) 9 Claims.

This invention pertains to improvedfprocedure fo (ia ry ng out glassware makingpperationsand t apparatus employed in connection therewith, and more particularly, to improved procedure for shaping articles while in motion. Thoseskilled n this particular art know v that the. sic-called improvements in. glassware making or shaping apparatus have inno sensebrought about a simplification. ofthe procedure and of the mechanisms employed. On theother hand, the mecha- -I nisms have increased in complexity of designand intri a votoperaticn. a. I

. ,In view; of the above considerations, it has been an object of my invention to providea new and m e simn ware. H

II have foundthat the new development in the art. of forming glassware hav notv only added to the complexity of; the. apparatus and the intricacy of... the operations, but havealso made the in:-

I ed procedure for forming glassstallation and maintenance costs. of layout almostprohibitive from the standpoint-of the small I operator. I

,Ithasflbeen. anotherfiolojectsof my invention to utilize an entirely new principle. in a glassware making proceduresuchthatthe efliciency of oneration will be increasedand th-at many intricate features may be eliminated, and that a; more eiieotive control I of the forming operations may behad. I

. Another object, or myinvention has been to obtain thewdesirable teatures oi a mechan-ically- I operated forming apparatus without. incorporatingtheundesirable features. j i

.Atwrther object. has been to provide a me- I chaniealbtcompact. glassware making unit which oapableoi effectively handling a continuous fluid stream-flower molten materialand which will. handlesueh material ma. smooth, positive, and

efiectivemanner. I

,These and many other 1Figure l is; a topplamj v-iew oi an apparatus embodying the I features of my invention;

Figure 2.- is a. sidexclevatiorr partially in section and taken along the linelII -ll of Figure 1;

Figure 3 is an enlarged. sectional elevation- .taken along the line; KE-J11 or Figure 1.;

Figure tiisla horizontal section taken alon thejline IVE-5W or 71 3:; N I I .yFigiureg 5.; is1 a vertical elevation of an or core mticmo I sertmninr i urahr.

a distributor valve shown in j .6wisa fragmentalsection takenenthe lineyv'h vlof Figures; I I H I I I I I I objects of my invention will appear to] thoseiskilledinthe art from the following description taken in; view of the claims another appendeddrawings of which e application May 27,

Figure '7 is a top plan View of the lower portion of apparatus illustrated in Figures. 1 and 12 and showing a fiu-id reservoir;

Figures .8. and9. are. fragmental sections taken along the. lines VIIIVIII and. IXIX, respectively, of Figure 7;

Figure 10: is an enlarged top. plan detail of a shear mechanism shown in Figures 1 and 2;

j Figure 11 is a sectional elevation. taken along the line XIXI of Figure 10,;

Figure. 12 is a sectional detail of linkage for operating shears of Figures, 10 and 11; and

Figure 13 is a pressure-time curve showingthe economy of hydraulically, forming articles in accordanoe withiny invention.

I have found that I can effectively handle molten glass having a high fluidity and which is fed as a continuous stream fromthe fore-.

hearth or orifice of a furnace and can do this without controlling or interrupting the flow of the stream in the manner heretofore thought to be necessary. I I have also, been able to carry out the temperature, the. head of glass, and the vol- I the actual shaping operations with a smooth efficiency and with a more complete control of the steps, involved. H

In accordance with the principles of my invention, I have provided a. glass forehearth having a suitable feed orifice and a stationary but adjustable flow control needle or other suitable means. That is, I provide a needle which may be set at a certain position in accordance with ume of it. which is to be fed ,throughthe orifice. During the actual operation of the machine, however, this needle remains stationary after its 1 position has been set for conditions such as outlined above. I

I have also provided a suitable driving mechanism forcontinuously turninga rotatable table which carries a plurality of radially-positioned I I mold. cups.

The mechanism drives a stationmounted pair of shears which are alined with I the orifice to quickly cut or separate the correct I amount of glass for each mold cup as. the glass .flows out of such orifice.

The number of cups, their paths of movement, as well as their speed of movement, are controlled so that as a portion of the glass is separatedor cutoff with a lighthing-like action, it immediately drops into and is.- received by a moving mold which at that instant is in the path of the drop. Of course,v

the proportioning willv besuch that there is always a mold in position for receiving a glass portion when out or separated, although the stream itself is continuous, has a high heat, and thus, is fluid rather than viscous. The speed of the cup movement. and of the, glass flow are adjusted to give the desired shape and size of the separatedglass portion, I i I I-believe that I have been the first to effecthat immediately after cutting, the separated portions are reheated and shear marks eliminated;

this feature being of very great importance. An- I other advantage is that the forming operations are accomplished with greatly increased economy.

The problem involved in successfully employing a continuous fluid stream of glass is not limited to the provision of a suitable number of cups which are progressively moved to receive each separated portion of the stream, but also involves the provision of forming mechanism which progressively, quickly, and surely forms a good quality article, and does it in such a manner as to leave time enough for the article or blank to be discharged from its mold cup, for the mold cup to cool, and then to move to a position to receive a new charge. By solving these problems, I have not only been'ab-le to utilize a new method of glass feed, but have also been able to form quality ware at a new high rate of production.

In order to carry out the forming operations while the mold cups continuously rotate, I provide each cup with an individual pressing mechanism whose operation is timed in such a manner that sureness, quickness, and smoothness of forming action has been attained, and the power required for the forming operations has been cut down to an extent heretofore thought to be impossible while still properly controlling the steps of the forming operations. I

The mold cups are adapted by cam track or other suitable means to move in and out with respect to their rotative axis in order that each cup will receive a glass portion or gather at its out position, and will receive a pressing plunger at its "in position to form an article or blank.

In connection with the forming operations, I have embodied an entirely new principle which results in amarked increase in efliciency, particularly from the standpoint of smoothness of operation and of economy of power. This principle comprises the employment of a liquid or some other relatively non-compressible fluid, such as Water or oil as a direct acting actuating hydraulic medium for each of the individual pressing mechanisms. 'When I speak of a hydraulic medium or a hydraulic fluid, I have particular reference to an incompressible material of liquid form such as water, oil, etc. I have found that the lag which normally'accompanies the pneumatic or air type of plunger action is entirely eliminated, and this is very important in view of the necessity for an extremely speedy forming operation as required by the continuous stream feed of the molten glass. The positiveness, sensitiveness, and effectiveness of a mechanical camrning action are obtained Without the consequent loss in control. The postiveness and smoothness of the action as controlled by asuitable valve system is indeed remarkable.

Further, in accordance with the principles of my invention, I have provided a piston to which a former or a blank presser is attached. The piston is hydraulically actuated in its forming stroke and is pneumatically actuated on its return stroke by the counter pressure of a compressible fluid. This compressible fluid is forced out of one end of the piston chamber into a closed extension chamber or accumulator by the piston during its forming stroke. Thus, energy of the forming stroke'is stored and later utilized to return the piston and the attached blank former to its tributes to the power lost.

original position. The flow of hydraulic fluid to and from the piston chamber is automatically controlled by a distributor valve which is, in turn, controlled by the rotation of the carrier and its associated mold cups. The hydraulic fluid is supplied to the valve, and thus, to the various forming mechanisms in such a manner that the pressure is automatically and practically instantaneously adjusted to the power requirements of each step of the operation of a given forming mechanism. As a result, the saving in energy and power is enormous, see the curve of Figure 13.

It is also true that a better control is had of the steps involved in forming a given blank or article; for example, the pressure used to move the former to a cooperating position with a mold cup is approximately that required to'overcome friction, see a of Figure 13. The pressure used to actually form or press out a blank in the mold cup is of a much higher value, see b. Such pressure is later backed off by the valve to finish the operation. The build up of pressure is automatic; it builds up as the need arises in a manner similar to the action of an electric motor when a load is applied. A relief valve prevents a build up of pressure beyond desired limits, and thus, prevents damage if, for example, foreign matter was accidentally introduced into a mold cup.

A pin valve mechanism controls the release or exhaust of the hydraulic fluid from the piston chamber to cause the-counter-pressure to at first slowly move the former ofi the blank, and then,-

out the forming operations of my invention isrelatively small since it is only utilized as required. As distinguished from this, a pneumatic system utilizes substantially the same amount of energy during preliminary and return movements of the piston as when the associated plunger is actually forming an article in a mold cup. The lag which accompanies the use of a compressible fluid in the forming stroke of a piston also con- I obtain the power economy and quick-action of a mechanical system, but on the other hand, obtain a simplicity and an effectiveness of control of the steps of formingan article which are impossible with a mechanical system.

In the curve of Figure 13, time has been plotted as an abscissa, since power is a function of it, and pressure has been plotted as an ordinate. Unlike the pneumatic system which isconnected to a large tank located at a distant point and in which compressed air is maintained at its highest work value for moving a presser during both its forming and return strokes, it shows that pressure is applied and proportioned in my system only in accordance with the actual requirements of the system. The period of time represented by 0 pact unit which may be moved from place to place or from forehearth to forehearth as needed.

vDuring the starting up operation,' I can continuously rotate the machine to pick up and dis- .sles n tiehs until the sues ree h t eeateh is. an pwa d y e tendin se t lumh 1 .5 fii hhut w ich ar 11 r time .i amiss arteries terl tete- 1A sui hle d ea or able I nt e s s the .e shl ur lup r exe l s r h me Per-hen H. eh is te tithe ryi ei time; sat-sierm mber Q.- een the e he 1 l? i Jewel d hen a. light l e he solemn. 5; by been 1 1 Whieh are. ure? t th ew s z hsnttiesrreh s igrqrnovab e flame l. w t Figure. l sweets hens it have a in t s mo abl a ut eutivardl he. .nstthe times re s ehshis with the ii hh a sati h sh is me ted W W heme 11:1 thi m hhe each 5; mo e o a dly ere ive to th righ t F ur 2 t F u e 1 ehcll h n ma a-stst 1 Gerri 1m he qeerstie th h QQQQIILPHSQM- Each rreisr hlr pr vided, w th a abl t ehi h l9: he a 'e eh ihe ada ted he r de n Mam. ash ex en ar re h h Ihe 1 w l b weeh daisq and: c ar n a eh he t it eat track there itiqhet sta qn A, m erdert eha t pe .QWf Qi; w ieh t rm d art cl l st sr 6s mol emi sq le i- T'fhe up r ear-he mem e 130 is meuhteel t removably secured "to and which supports anesr member 6. that the 1 s o ti theme er ie hih m e s ismlis mo nted di e ly in alinement with an associated cup l5 when that cup has been moved to its inner position onits carrier in; and, since both the upper and lower carriers 30 and. H) are. connected together, it will appfiar that. they rotate in synchronism and that the pressing mechanism is always ready for operating upon a gob in the mold cup. i In order to strengthen the upper carrier 31] an to hold it in the proper spaced relationship with respect to the lower carrier I0, I have provided a plurality of vertically extending positioning rods .42 which are screwed into the lower carrier and are bolted to the upper carrier. A drip pan 43 is removably mounted to extend between t e chamberedvalve housing 33 and the upper ends of the piston chambers 4 I.

. Referring particularly to Figure 3, it is seen that I plunger 5.8 has an upper flange or annulus 44 that abuts a slide head; 45, both of which are removably mounted. on a threaded extension portion of the connecting rod 40. The slide head 45 moves witht in a housing cap 46, and an article edging annulus s l jehs fiklla b ad ust d to v ert hs. w lr sn g u re t s lura st .ei nhi b shh t tm he. m eh sm 31...in th s de e me hani i r vid dst eel. the w tha su able e ess ri Pressure connected to" a valve-housing chambers m h 3. ti hhis retsts l J'ehrneled by he r 1 ishesh rmme me ha m at e er ses 2 esuit es, s

ts. velume hd-h e h. hy e s see she; ceiving the next successive charge,

41 is bolted to a lower flan e of the hou p 6 to limit the maximum downward movement of plunger 01'- former 3.8.. A pair of disc-like plates 48 areadjustably mounted on rod to control the compression of a spiral positioningspring 49. This. spring 49 rmally maintains the pp r nd ofthe slide head in abutment With thei-nner top wall of the housing can 46. Figure 3 shows that slide head 451s. a its lo e position wh he or er 3B i pressin o t. b ank; att e ei th arrangement prevents injur to the appa atus. t pr mer mav me t. or th Pr se or i he 3 isobstructed.

The len th of-s re e o the ass. as is s i ab y adiust d by ue s es t wh h are rea ed enroeszfi that zst nelt i m t e a er 301w. e operate with plates. 4%. Th sun It eem r s at h r t on h hireh st red Z0. which. e -she th thre -h. a. menthe s ee e 2- memorably mount ssm h- 1 e s s eshle for i p s n The operating mechanjsn torrotating the carriers tit and sh-may be of ui ab e e m su mete .1 nre j eti with t ble Qlutch s1, 5mm dr e g a ,3; As ee 2- .theh h heannu1us, 1-2. or H is qtided; with an out r ear o l hsh s a d s.. -ri n. b t es .iee e me heh sm own nc udes. a o

hearth 5A hay ng a refractory orifice 55, positionhev s s 1. 2 and he ih t hl e ht e needle Sinc ear -rin c m h ti nl u z a continuous stream ofa hot liquidslik glass 58 as distinguished from an interrupted stream of set flow st t he slej 5- s pre i 't d es f i he ed 1pm. th temperat re i the glass;

tzlwi l; e ap a e t tha upp y a co u us srhvi y fiow sf: fluit 'er m lte ele swh s ate i the ha e central ethod of: fe d n r it low f: e molten class is not pe i d a l huem ted or retard d bra. re ip roe l-u ger or rotating bell tofi lim shapeder W r in my inv n io h ars y n eptw th ut ubs n a ly b sh. the up ersr The time s i te ruptieh s slifii e Pe mit s ares to. e; r c i d new we teh p esented tar ieass, i s on necessar p m er y My ad ust d: y the t p r or need e Figures 2 and'll.

For separating the stream into charges, I pros vide a suitable shear mechanism WhlCh has a vertically extending column 59 mounted upon the. stationary frame I. Adjacent'the top of the column 59,I have mounted a removable cap 59a upon which is supported the operating mechanism of the shears. The shear operating mechanism includes a pair of shear blades 60 and 60a pivotally mounted on a shank 60' by suitable bolt means BI which, at its lower end, is bolted to an extension of the cap member 5911. Each sheer blade at its rear end is provided with two oppositely-positioned outwardly-projecting tabs 62 and 63; and actuating links 64 and 65 are pivotally connected to the tabs by studs 66 and 6'! for moving the blades to open and closed positions. The links 64 and 65 are pivotally connected together at a common point by a cam-roller support-stud 68 upon which is alsomounted cam roller '69, as well as a positioning arm E0. The positioning arm I is pivot-- ally mounted on the stationary cap member 59a at its other end by a stud II. A spiral spring I2 is connected between the arm I0 and the cap 59a for normally holding the arm cam roller 69 tightly against a rotating cam disc I3. A spiral spring I6 resiliently holds the blades 60 and 60!: on shaft 60.

I have also provided a trip cam for holding the shear or scissor blades in their closed position, independently of the operation of the cam 13; this trip cam comprises a finger lever I4 pivotally mounted on the stationary cap portion 59a and having a cam'face I adapted to abut the arm and press it outwardly away from the op:- erating' cam I3. As shown, the actuating cam disc I3 is centrally axled to a vertical operating shaft II which is journaled by suitable bearings I8 within the cap 59a and the column 59. A lubricating cup BI is shown in Figure 11. Beneath the cam disc I3 is a rotatable plate I9 keyed to shaft 11 and having bolts 80 extending upwardly therefrom} The cam I3 may be moved to the extent of the slots shown in Figure 10, for adjusting the cutting operation of the shears to the proper timed relationship with respect to the rotation of the drive shaft 11.

The shear mechanism is driven in a timed relationship with respect to the rotation of the carrier members I0 and 30, since it is driven by the ring-gear annulus-membe I2, see particularly In this connection, I have provided a suitable gear 82 meshing with the ring gear I2 and keyed to a rotating shaft 83, upon one end of which is keyed a suitable gear 84 which meshes with a chain of pinions 85 and 86. The chain of pinions in turn meshes with a small gear 81 keyed to the drive shaft 11.

For carrying out the forming or pressing operations, I have provided, as shown particularly in Figures 1, 2, '7, 8, and 9, a suitable reservoir I for hydraulic fluid, such as water or oil, a pair of rotary pumps 90 and 9| connected in parallel and driven by motors 92 and 93. The pumps 90 and 9| have a suction line 94, a valve 95 for controlling the flow therethrough, a relief line 96 and an'automatic relief valve 91. A pressure line 98 is connected to a vertical pipe 98' which extends upwardly through the central column 5 of the machine. The numeral 99 represents a suitable pressure gauge. Of course, both the relief line 96 and the suction line 94 enter the reservoi I. The inside of the column 5 acts as an exhaust line for forming mechanisms 3|, since it is connected at its lower end by a pipe 8 to a reservoir I, see Figure 2. i a

The control mechanism includes a'distributin valve I00 mounted at the top of the central column 5, see particularly Figures 2, 3 to 6, inclusive. This valve comprises a base portion IOI removably secured to the column 5 by suitable bolt means I02. The base IOI has an annulus portion I02 adjacent its upper face for supporting the lower bearing 34. A central core portion I04 rests upon, is keyed to and extends above the base portion IOI. It has a cap member I05 secured thereto by bolt means I 06 and locked with respect thereto by extensions I01 and pinsIIl8. The cap portion I05 is grooved to receive the upper bearings 34 and the rotary outer chamber housing portion 33. As seen, the chamber housing 33 extends between the upper and lower bearings 34 and rotates about the central core portion I04. i T

In Figures 3, 4, 5, and 6, I have shown the operation of the valve. The chamber housing member 33 is provided with the same number of chambers I09 as there are pressure cylinders II, and each of these chambers is connected'by a telescopic pipe I I0'to itsrespective piston cham-* ber. In Figure 3, the pressure line is shown connected directly to the cylinder 4| and the plunger 38 is forming an article A in the mold the valve, while the chambers immediately adjacent the chamber I09a which is receiving the hydraulic fluid are completely shut on from any flow, except that the chamber I091) is connected by suitable passageway H2 and II3'to the exhaust II I the flow through these passageways is controlled by an adjustable needle valve II4, see particularly Figure 6. That is, when the chamber I09a is receiving pressing fluid, the chamber I091) has been cut off from any pres si ing fluid and has been slightly opened to the exhaust, in order that an accumulator'mechanism which will be hereinafter described, can slowly initiate a return mo'vementof the plunger 38. However, after this short period of slow movement, the rotation of the carriers brings the chamber I09b directly in line with the exhaust A passageway III and permits the accumulator t0 immediately snap back the piston 39 and its associated plunger 38 to their original positions. Viewed from Figure 4, the chamber I090 is closed off to the exhaust III immediately before it is opened to the pressure chamber 99a.

As shown, the lower end of, each piston chamber 4I is connected through the pipe 511 to an annular accumulator header II5'which, in turn, is connected through suitable piping us to an accumulator chamber I II which extends in} wardly and vertically along the rotary frame I3.

A suitable gauge I I8 has been provided. In order I to have a smoothly acting rotary distributor core I04 which will not lock during certain periods of its movement, I have provided suitable balancing dead-end slots I20, I2I, connected by passageways I22 and I23 to the pressure chain: ber 99a, see Figure 5. Drain passages I24, I25, I26 and I2'I are connected to the exhaust chamber I I la. I have also provided an annularly extending drip trough I 28 connected by a drain pipe I29to a liquid return passage III in the valve base I09. i

operative position after a shape has been provided.

3. In a machine for making shaped articles, a support, carrier means rotatably mounted on said support, mold cups on said carrier, a pressure means for each mold cup on said carrierfor shaping material therein, means on said carrier intermittently actuating each presser to shape material in each of said mold cups, valvular means on said support and having a portion rotatable with said carrier means, means providing hydraulic pressure for actuating each of said pressers, an operable connection between said hydraulic pressure means and each of said pressers, said valve being operably-positioned in such connection between said hydraulic pressure means and each of said pressers, said valve being constructed and arranged and having another portion operably mounted with respect to said rotatable portion to intermittently supply actuating pressure fluid to each presser during the rotative movement of said rotatable portion with said carrier means.

l. In a machinefor making shaped articles, a support, carrier means operably mounted on said support, mold cups on said carrier means, pressers onsaid carrier, each of said pressers being constructed and arranged to shape material in one of said mold cups, presser cylinders on said carrier means, a piston mounted in each of said presser cylinders and connected to one of said pressers, means providing hydraulic pressure and being operably connected to said piston cylinders for moving said pistons therein, valvular means for periodically cutting off flow of hydraulic fluid pressure from said hydraulic piston therein, means for continuously rotatingthe carrier, a pressure line opening into one end pressure means to each of said piston chambers after a shape has been formed in a mold cup by one of said pressers, said pistons being constructed and arranged to move said pressers to a shaping position and to thereafter shapematerial in said cups, and means energized by said hydraulic pressure means for returning said pressers to original inoperative positions after material has been shaped in said cups, and means for controlling the efiective counter action of said fluid for returning said pressers and their associated pistons in a desired manner.

5. In a continuously moving machine for making shapes, a support frame, a carrier movably mounted on said support frame, means continuously moving said carrier on said support frame, mold cups on said carrier, blank-forming plungers for said mold cups, piston means operably associatedwith said plungers for actuating them, a primary means providing fluid pressure and being operably connected with respect to said pistons to move them in one direction, a secondary means providing fluid independently of said primary'means and being operably connected with respect to said pistons ,fp move them in an opposite direction, said secondary means also being constructed and arranged and operably connected with respect to said pistons in such a manner that it will be energized by the movement of said pistons produced by said primary means, a distributor valve operably timed to the movement of said mold cups and having means controlling actuation of said pistons in succession by said primary and secondary means.

6. Apparatus of the class described comprising a succession of hydraulic press units mounted on a carrier, each unit including a cylinder with a of each cylinder, a counterpressure line openinginto the Other end of each cylinder, a distributing valve movable with the carrier for. successively connecting each of said pressure lineswith a source of fluid pressure. and subsequently to anexhaust passage to first apply pressure to. the piston and then relieve pressure in each cylinder in turn, and a common closed reservoir with which all said counterpressure lines communicate, said common reservoir being closed to re-' tain a compressible fluid under pressure whereby said reservoir serves as an accumulator to effect the return stroke of the pistons as their pressure lines are successively opened to the exhaust passage.

,port and a turntable on the support, a, plurality of molds thereon spaced from one another at equal angles, means for continuously rotating the turntable, a plurality of individual press units on the turntable, each having a fluid pressure cylinder with a pressure pipe at one end, a counterpressure pipe at the other end of each cylinder, 2. pressure distributing valve to which all the inlet pipes connect comprising an annulus that rotates with the turntable having a port for each inlet pipe, and a fixed valve. member in the annulus having a pressure port and'an exhaust channel whereby the ports in the annulus suc-, cessively move past the pressure port and then the exhaust port, and a third port in said valve having a restricted passageway leading into said exhaust port whereby to break the. pressure in the cylinders before fully opening them to exhaust, and a closed reservoir to which the counterpressure pipes lead.

8. Glass molding apparatus comprising a support, a turntable on the support having a plurality of molds thereon spaced from one another at equal angles, a succession of press units on the turntable, there being one press unit for each mold, means adjacent one portion of the periphcry of the turntable for .feeding a charge of glass into each. mold in succession, said molds being radially movable on the table toward and away angles, a, press unit on the turntable for each mold, each press unit including a cylinder with. a piston therein, means for rotating the turntable,

a stationary valve member at the top of said column having pressure inlet and exhaust ports.

thereon, a rotary valve member on the turntable cooperating with the stationary one and having,

a port therein for each cylinder, each port being connected with its respective cylinder, a counterpressure passage leading from theopposite end of each cylinder, and a closed reservoir having,

compressible fluid trapped therein mountedon the turntable with which all of said pressure passages communicate.

EDWINE. SLICK.

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