US817384A - Pneumatic motor. - Google Patents

Description

No. 817,384. PATENTED APR. 10, 1906.

R. A. NORLING.

PNEUMATIC MOTOR.

,. APPLIUATION FILED JULY 20. 1904.

` 4 SHEETS-SHEET 1.

lilly uNo. 817,384. PATENTED APR. l0, 1906.

PNEUMATIC MOTOR. PPLIGATION r1LBn-JULY2o.19o4.

4 SHEETS-SHBET 2.

, PATENTBD APR. l0, 1906.

R. A. NORLING. PNBUMATIC MOTOR. APPLIOATION FILED JULY2o.19o4,

l WWW w 1F L1 .N Q, QN NNN Q @Prion REINHOLD A, NCRLlNCr, CF AURORA, lLLlNCl ASSIGNOR TC AURORA` AUTCh/IA'MC MACHINERY CCMPANTI, CF AURORA, lLLlNOIS, A CCR- PCRA'HCN OF ILLINOXS. i

pancarte No. erases.

Specication of lllietters` Patent'.

Patented April 10, 1906.

Application tiled July 20., 1904.. Serial No. 217.3724

To all whomV it may concern: p

Beit known that l, REINHOLD. A. Nonitnve, a citizen of the United States, residing at Aurora, in the county `oi Kane `and State of illinois, have invented certain new and' useful Improvements `in Pneumatic Motors;

`and Ido hereby declare that the following is a full, clear', and exact description thereof,

reference-being had to the accompanying drawings, and to the letters of reference fmarked thereon, which form a part of this specification.

.This invention relates to improvements in Vportable pneumatic drills or mechanisms oi vthat kind 'embracing a Huid-pressure engine of portable form applied to operate a drill'or i like toch-such, for instance, as is illustrated and described in United States Letters Patent No. 762,932, granted to me on the 21st day of June, 1904.

yThe invention relates to improvementsin .machines of the kind above described designed to makethe same reversible or capa- `ble ofv giving-to the tocl driven thereby rotary. motion in either direction at the will of theI operator.

The i .vention consists in the matters hereinafter set iorth,l and pointed out in the ap- I pended claims.

. In 'the' accompanying drawings, illustrat- `ing my invention, Figure 1 is a sectional view 'of a machine embodymg my invention, taken on a plane passing through the central axis .of the tool-actuating spindle and the crank- Fig. 8 is a detail section taken 'shaft thereof. Fig. 2 is a plan view oi the f-engine.. Fig. 3 is a sectional view thereof, 1 taken upon line 3 3 of Fig. 1.

tial sectiontaken on the line 4 4 of Fig. 1. Fig. 5` is a sectional view through the casing of the machine, taken on the plane indicated bythe indirect line 5 5 of Fig. 2. Fig. 6 is an .enlarged detail sectional'view of the reversing sleeve and air-tube shown in Fig. 6.

the inner end oi the said spindle.

Fig. 4 is a par- As shown in said drawings, A indicates the mam casing oi the machine, which contains four powercylinders B B C C-, a crankchamber D, and air-chambers E and F. To

the bottom of the main casing A is attached a cap or auxiliary casing A. The cylinders B B C C are arranged in pairs, with the two cylinders B C and B C constituting each pair parallel with each other, the air-chambers E and F being located in the sectorsha ed space between the pairs oi cylindersa Wit 'n the crank-chamber D is a crank-Sbatti- Cf, which engages at its upper enda bearing H. in the top wall of the main casing andfat its lower enda crank-bearing I in the auxiliary casing or cap A. The .pistons b b c c within said cylinders are connected by connecting-rods b2 b3 c2 c3 with the cranks of the crank-shaft Cr.A

J indicates the main driving-spindle of the machine, through which motion is transmit-i ted ,to the rotative tool or other part to be driven. J indicates the shank of a drill insertedin a socket in said. spindle J.-`Said spindle J passes through the cap A', having a-bearing K therein, and into the main casing, which is provided with a bearing L for The driving spindle J is actuated from the crankshaft G by means oi a pinion G on the crankshaft, which intermeshes with a gear-wheel J on the spindle.'

M M indicate oscillating cylindric valveplugs which are arranged with their central axes or axes of rotation transverse to the cylvinders B Band C C and which turn. in cylindric seats or chambers formed`thereforin the "main casing A. Each of the oscillating valveplugs is-.arranged to operate in connection with one pan` oi the cyllnders, the valve M lbeing arranged to operatein connection with tli'e cylinders B C, while the valve M" operates in connection with the cylinders B C. The said valve-chambers' are formed in the casing4 A between the pairs of cylinders B CK and B C and extend across the outerends of said cylinders, the valves being interposed between the outer ends of said cylinders and the chambers E and F, which latter occupy lthe central space in the casing between the outer ends of said cylinders and extend between the top wall A2 of the casing 'anda wall or diaphragm A3, which forms the bottom of the air-chamber E. The inner wall of the said air-chamber E is formed by a partition A4, which extends from the diaphragm A3 upwardly to the top wall A2 and separates the air-chamber E from a central space or chamber A5, located adjacent to the crankchamber between the inner ends of the cylinders and separated from the said crankchamber by a partition AG. A feed-screw N is arranged in alinement with the drivingspindle J and is mounted in a sleeve N', which is attached to the top wall A2 of the casing and extends.y in to said chamber A5, said feedscrew N havingradial handles n, by which it may be operated. The air-chamber F is located adjacent to the top wall A2 of the casing, and the chamber E is located adjacent to the bottom wall A3 thereof. `YSaid chambers E and F are separated fronigeach other by a horizontal diaphragm or partition A7,

arranged about midway between the top' wall A2 and the bottom wall A3 and by a vertical partition A8, which joins the rear edge of the partition A7 and rises to the top wall A2, said wall A8 being located between the partition A4 and the front wall of the casing and extending between the upper parts of the valve-chambers, as clearlyv seen in Fig. 3. The air-Chambers E and Fvconstitute either air supply or exhaust chambers, according to the direction in which the motor is running.

The vvalve seats or chambers are shown as provided with bushings or cylindric tubular linings M2 M3, which form the bearing-surfaces for the valve-plugs and which are provided with slots or openings which constitute inlet and outlet ports and cooperate with the ports or passages in the valve-plugs, the said bushings and the valve-plugs having each twosets of ports and passages, one for each, of the two cylinders with which the .valve is associated. The ports in said. valvecasings M2 M3 are lettered alike in the drawings for all four cylinders, those aifording comn'iunication between 'the interior of the valve-seats and the cylinders beingmarked m, while those which communicate with the air-chamber E are marked m. A

The valve-plugs M M are like those illustrated and described in United States Letters Patent No. 762,934, granted to me June 21, 1904. The several sets ofports and passages of said valve-plugs are lettered alike in the drawings. Each plug is provided with a longitudinally centrally arranged passage 'm2, with two external recesses m3 m2, one for each cylinder, which extend partially around the plug and form passages adapted to conneet the-outer ends of the cylinders with the air chamber E, and with two transverse ports or passages m4 m4, which extend from the central passage m2 to the side face of the plug at points between the ends of theexter- 'nal recesses 4m3 m3. When the plug is turned zin the position to bring one end of one of said passages m opposite one oi the cylinder= ports m, communication will be establishedr between the cylinder and the air-chamber E, the said recess m3 being always in communication with the supply port m. The lsaid ports m4 m4 are adapted to bring the central passage m2'into communication with the cylpassage m2 into communication with'the outer gend of one of the cylinder-ports, the other (port m4 in the plu; ill be out of register with its associate cyider-port, and the latter will be in communication with the recess ms.

The valve seats or chambers for the valveplugs M M open at their upper endsinto spaces or chambers F2F3, formed by means of upward extensions of the top wall A2 and preferably closed by means of removable caps A". Said chambers F2 F3 communicate with the exhaust-chamber F by means of lafterally and downwardly directed passages F* F5, leading from the upper ends of the'valve-chambers into the top of the said chaniber F, clearly seen in'Figs. 2 and 5. Said lchamber F, being separated from the chamber F by thehorizontaldiaphragm-or partition A2, lextends downwardly from4 the top wail A2 only about one-half the length of the valve-chambers; but the rear or inner part ci the chamber E extends practically the full length of said valve-chambers, the space between the partitions A -and A7 constituliii'ig a part or upward extension of the chamber E, so that both the ports m ml of both the valve-chambers are in communication with said chamber E, as clearly seen in Figs. 3 and A.

From the above it will be understood that if air be supplied under pressure to the chamber E it will pass from saidchamber to either one of the cylinders, when-the valve-plug is turned to the required position, through one oi the 'ports m', the external assage m3, and the cylinder-port m to the cy inder, while exhaust-air from the said cylinder will passoutward'ly from said cylindertport m through the port m4 td' the central exhaustassage m2 and from the upper end of' said ex aust-passage through the chamber F2 and passage F4 to the chamber F, which is in this case the exballet-chamber.

The above describes tlie passage of the air when the engine is runninor inits normal or usual direction ybut when he direction of rotation `oiE the driving-spindle yis reversed through the reversing-valve hereinafter described ,the air will enter the chamber F, will loo' los

IIO

pass from said chamber through the'passages FF, then through the central passage m2 oit' y the valve-plug', and thence through the port m4 to the cylindereport m., while the exhaust 5 airv from saidcylinder will pass through said cylinder-port m, the external passage m3, and the port m", from which it will enter the chamber E, which in this case .becomes thev` and close the lower ends of the valve-cham-l bers, said 4rock-shafts being connected with o the lower ends of said valve-plugs, so as to turn the saine.` These parts are like the corresponding features of the engine shown in my prior patent, No. 762,934, hereinbefore referred to.V x

-5 Now referring to the reversin valve which forms part of the invention, indicates a tube which is rigidly attached to the casing A and forms one of the handles of the tool and threugh which compressed air is suple `plied to drive the motor. Another handle Q is shown as attached tothe casing A at the side thereof opposite said tube'Q. The tube Q is provided at its outer end with .a nipple Q2, by which a iiexible air-supply 5 pipe or hose may be connected therewith. R indicates a valve-casing which rojectsfrom the side Wall of the casin A and) is located on the "said casing Ain suc manner as to eX- .tend above and below the partition A7, which io separates the air-chambers E and F from each other.- Said valve-casing R is shown as having the form of an outwardly-extending cylindric lange'on the wall of the casing and as provided with a capR, which forms a i5 removable head or closure for the` valvecasing R and is shown as entering the outer end of and having screw-threaded engagement with the said valve-casing. lThe tube Q vis attached at itsinner end to the cap R and is 5o shown as secured or attached to the saine by means of a screw-collar R2, having scre'wv threaded engagement with the outer end oi the cap, and; envia-ging an annular harige on the inner end ot said tube Q, the said tube 5 5. being heldirom turningrelativel)T to the cap by meansjof said arts a, `heir meeting edges. i,

Within alve-casing R is located a cir cular fixed crwonTrotative disk S, the outer face oiwhichiorm's a valve-seat and which is 'held orclamped 'irplace' within the casing jby` means of aniinwardlvextending annular ligldge L1;

disk Uis an actuating rod or stem V, which a-,ping which engages both of lspace,surrounding the stein "if".

on the capMR:f r'lheloufter'face oi" leef estewiihiwhexelr p a heariiigsur-k faceagaiust which rests the seatfdiskSvhile i lthe end of the cylindric Hanfe r bears against the outer margin of said dis v4and acts to hold 'or clamp the saine against the said wall of the e Y" y' casing, The said seat-disk S is provided with diainetrically opposite valve-ports ssl', I while the wall of the casin is provided with two ports openinw'several y into the chain l .l

bers E and F an `arranged in re ister with] or to forni continuationsof the sai por-,ts s Theports or openings E ands constitut a e passageleading from the interior of the val @1 -i1 l casing to the air-chamber E, and ,the port" it and s form a passage leading from the. interior of said valve-chamber to the chamberF.

W'ithin the valve-casing R `and surround# in the stationary seat-disk Sis termed an ,if u "ex must-passage T, which .communicates with the outer air through outlet-openings t .wim

' BgfA l t, and the said valve-plate S is provided in its outer or bearing face with a central recess or de ression S', which communicates withsaid` eX aust-passage T by means of radialpas'f` 'ndicates a rotative valve-disk which is" 9 f` located within'the valve-casing and bears at its inner face a ainst the stationaryT seat-disk. y

Said valve-dis U is provided on its inner or' `bearing surface with a central recess U', 'which corresponds in position with and is in 95x communication with the central recess S of the stationary lseat-disk S 'and with two radial rooves or assagcs u u; which extend radily outward in the inner-face oi said valve-disk at an angle of ninety degreesfrom each other and are adapted for co1nmunication at their outer ends with either one of the ports s s of the valvehdisk S.- Said valvep disk U is also provided with two orts or 'p p holes u2 ua, which'extend through t e same fc5' and are located at an angular distance -from. each other of ninety degrees and alsoat an angular distance of niifsty degrees ironi the 1 passages a 'a'. Connected with said valveextends outwardlvthrough the tube Qand i 'has bearing at. its outer end in a sleeve 4V',

which fits withinsaid tube Q. 4Said stem V yis made sufficiently smaller than the tube Q to permit the free passage of air around the r15` same to ythe space within the cap R',v andaf` longitudinal lgroove t* is formed in thepart ofthe said stem which enters thesleeveVQlfso that air 'may'pass freely from the outer''end of the tube Q through said groove 'v tothe For actuating the valve-disk U or'giving rotative motion to the same devices are *prvided as follows: W indicates an external sleeve, constituting a hand-grip, which sur-` rounds the outer part of the tube Q andfis adapted "to turn or rotate thereon; Said sleeve "N is connected with the stern V-by j means. of a stud W', which passes through a transverse slotg inthetube Q anda'lileslot x 3c p roo"i iro" e in the sleeve V. Said stud W is shown as having screw` threaded engagement at inner end 'with the stein Y. valve-disk U is loosely connected with the stem' V in such manner that the said valvedisk may be held by the air-pressure against vthe seat-disk S, the connecting devices illustrated consisting of a {lat-sided central lug U2 on the said disk U, which enters al correspondingly-shaped socket in the end of said valve-stein, and a stud n4, which is iiXed in the said valve-disk and engages a notch in the outer faceof said stem, as clearly seen in Fig. 6.

Fig. 5 shows the position of the parts de- 'scribed when the valve-disk U is turned in position for the passage of air from the sup ply-pipe to the air-chamber F and the eX- haust'of the air from the air-chamber E. In this position of the parts the port us of the rotative valve-disk registers with the port s of the stationary disk, and air from the interior of the tube Q passes through said ports ui* and s to the interior of the chamber' F. Exhaustair from the chamber E passes, in this instance, outwardly through the port s in the stationary seat-disk and then through one of the radial passages u in the plate U to the central recess S of thestationary seat-disk, from which it passes outwardly through the passages s2 tojthe eXhanst-passage T, from which it is exhausted through the holes t t to the outer air. By turning the valve-disk one,- fourth of a revolution from the position shown in Fig. 5 the end of the passage uY will coincide with the port s', while the port u2 will coincide with the passage s, andhen the movement of the air will be reversed and the air-supply will enter the said ports u2 and s, while the exhaust will take place through the porte--aii't l;the centraltrecess S of the plate S. i`The`vii5lve-disk s shown as provided with two ports u2 ua a d two passages a u, arranged at an angle ot, ninety degrees (903) to eachother in the manner shown in order that the reversal of the .engine 'may be e i'ected by a`quarterturn-only of the rotative -sleeve or grip WT, it being of course understood that in case' said disk should be made with only one port and ene recess they would be arranged diametrieally opposite to each other and then a half-rotation of the vaivedisk would be required for reversing the enm gine. The valve arranged as described operates both as a reversing-valve and as a cut- 'oft or throttle valve, it being manifest that when one of the ports cru3 opposite one of the ports s or s if the valve-disk U be turned about an eighth of a turn the imp/er forate (part of the disk U between the said ports u2 u will be brought over the port e or s, and the air-supply will then be entirely cut off.

In connection with the valve'. arranged both as a cut-oh" or throttle valve and a re- The rotative versingyalve, as above described, I have provided. means for limiting the rotative movement of the grip IV, so that when the operator desires to run the mot-or in one di rection only he may not inadvertently reverse its direction of motion by turning the grip too far for admitting and cutting off the air-supply. the tube Q adjacent to the inner end ofthe rotative sleeve or grip W a sliding ring W', having attached to it a longitudinal stopbar w, which engages and slides endwise in a recess or groove q in the tube Q and projects beyond the edge of said ring W in position to engage a notch w in the said sleeve l/V, Fig. 10, when the ring is thrust toward the sleeve. Saidy notch w is made of sufficient width or length circumferentially of the sleeve to permit rotative movement of the sleeve during a distance oi" about one-eighth of a turn, this being sufficient to cut oif and admit air to the motor, but preventing suiiicient rotative movement of the valve-disk to effect reversal of the motor. Vhen, however, it is desired to reverse the motor, then the ring W is slid away from the sleeve W far enough to disengage the stop-bar Iw from said sleeve, when the latter will be left free to turn. For limit'- ing the movement of the sliding ring V on the tube Q a stop-pin q2 is inserted in the tube Q and projects outwardly into a slot wz, formed in the said ring W.

I claim as my invention- L A pneumaticinotor coin rising a powercylinder, -a `valve for contro ling the admission of pressure fluid to and its exit from said cylinder, a supply-pipe, and areversingvalve embracing a valve-casing with which said supply-pipe is connected, said valve-casing being provided with an outwardly-facing valve-seat having two ports, both of which are in communication with said cylinder by supply and exhaust passages controlled by said eylinder1valve, 'a rotativeV valve disk bearing on said seat and adapted for bringing either of said ports in communication either with the air-supply pipe or with the outer air, a. valve-operating stein connected with the and a sleeve mounted to turn on saidpipe and forming a hand-grip, said sleevebeing connected with said valve-stem by operating means extending through a slot in said pipe.

2. A pneuina tic motor comprising a powersion ot' pressure lluid to and its exit from said cylinder, a supply-pipe, and a reversing-valve embracing a valve-casing with which said supply-pipe is connected andwhich is provided with an outwardly-facing 'valve-seat having two ports, both ot' which are incominunication with the cylinder bysupply and exhaust passages controlled by said cylindervalve,` a rotative valve-disk bearing on said For this purpose I provide upon.

valve and extending into said supply-pipe,

cylinder, a valve for controlling the admis seat and adapted for bringing'either of said IIO \ massa ports into communication either with the airsupply pipe or with the outer'air, and means -for loperating said valve-disk from the exterior of'said pipe, said valve-operating means being loosely connected'with said valve-disk so that the pressure inthe supply-pipe tends to hold the valve-disk against the seat.

3. Apneumatic motor comprisinga power'- cylinder, a valve for controlling the admissioni of pressure fluidk to and its exit from said cylmder, an air-supply pipe and a reversingvalve embracing a valve-casing .with which the sup ly-pipe is connected and which is provide `with an outwardly-facing valveseat, and a rotative valve-disk bearing on said seat, said valve-seat being provided with two eccentrically-arranged ports which are yinl communication with the cylindersupply` l 'and exhaust passages controlled by said cylii idervalve,-`With a central recess and .with

passagesvleading from said'central recess and communicating with the outer air, and the ysaid `valve-disk being provided with an eccentrically-arranged port extendin therethrou 1li and ada ted toregister wit either oiisai ports in t 1e seat by turn-ing the disk, and lsaid disky being provided in its bearingface with a radial groove or recess adapted to connect the said central recess ot the valveseat with either of said ports the valveseat.

4. 'A portable pneumatic motor comprisinU'an-exterior casing provided with a powercylinder, a valve for controlling .the admission of pressure fluid to and its exit from said cylinder, a supply-pipe and a reversing-valve comprising a valve-casing attached tothe said motor-'casing and with which said supply-pipe is connected, a stationary valveseat disk located within the casing and pro- 7 vided with two eccentrically-arranged ports jwhi'ch ,communicate with cylinder supply and lexhaust passages in the motor-casing thatare controlled by 'the cylinder-valve,

said valve-seat disk being also provided in its bearing-face with a central recess and with y Aradial assages leading outwardly from said .fcentra recess and opening to the outer air,

and a rotative .valve-disk bearing against said seat-disk and provided with an eccentric port ada tedV to register with either of said ports in t e said seat-disk and having in its inner face a radial groove or ,passage adapted to bring said centralrecess of the seat-disk into communication with either of said ports in said seat-disk.

'5. A pneumatic motor comprisinga powercylinder, a valve for controlling the admission of pressure iluid to and its exit from said cylinder, an air-supply pipe, and a reversingvalve embracing a valve-casing with which the supply-pipe is connected. and which is provid with a stationary valve-seat disk and a rotative valve-disk bearing on said ys'eat, said valve-seat disk being provided with two eccentrically-arranged ports which' are in communication with the cylinders, supply-passages controlled by said cylindervalve, with a central recess and with sages leading outwardly Jfrom 'said centra recess, and said valve-casing being provided outside ot' said yalve-seat disk with an annucentral recess of the valve-seatwitli either of.

said ports in the seat-disk.

6. portable pneumatic motor comprisan exterior casing provided with a powercy inder, a valve for controlling the admission of pressure fluid to and its exit from said cylinder, an air-supply pipe and a reversingvalve embracing a valve-casing with which the sup ly-pi e is connected and which is provided) wit an outwardl 7-facing valveseat, and arotative valve-disk bearing on said seat, said valve-seat being provided with two eccentrically-arranged ports which are in communication with the cylinder and supply -lpassages controlled by said cylindervalve, with a central recess and with passages leading trom said central recess 'and communicatingwith the outer air, and the said valve-disk being provided with two eccentrically-arranged ports extending therethrough and in its bearing-face with two radial grooves or recesses joined at the center of the disk and adapted to connect said cen- -tral recess of the valve-seat with either of said ports therein.

7. ,A portable pneumatic motor compris- IOO ing an exterior casing provided with a powercylinder, a valve for controlling the admission oi pressure fluid to and its exit Jfrom said cylinder, a supply pipe, and a -reversingvalve comprising a valve-casing attached to said motor-casing and with which said sup-` plyipe is connected, a stationary valve-` seatl islr located within the valve-casing and provided with two eccentricallyarranged ports which communicate with cylindersupply and exhaust passages in the motor-casing that are controlled by the cylinder-valve, said valve-casing being provided with a ca having an inwardly-extending Harige whic bears against the marginal part of said valveseat disk and holds the same against theinner wall of the casing, said valve-disk bein provided in its bearing-face with a centra recess and with radial passages leading outwardly from said central recess and openin to the outer air, and a rotative valve-dis; bearing against said seat-disk and provided IIO With an eccentric port adapted to register with either of said ports in the seat-disk and Y having in its inner face a radial groove or paswith the cylinder supply and exhaust pas-- sages controlled by said cylinder-valve, a rotative valve-disk bearing on said seat and adapted for bringing either of said ports into communication either with the air-supply pipe or with the outer air, a valve-'operating stem connected with the valve and extending into said su ply-pipe, a sleeve mounted to turn on salu pipe and forming ahand-grip,

said sleeve being connected with said valve-v stem, and a shift-able stop mounted on said` supply-pipe and adapted to engage said sleeve to limit the turning movement thereof.

9. A pneumatic motor comprising apowercylinder, a valve for controlling the admis sion of pressure fluid to and its exit from said cylinder, a supply-pipe, and a reversing-valve embracing a valve-casing with which said supply-pipe is connected, said valve-casing being provided with a valve-seat having two ports both of which are in communication with the cylinder supply and exhaust passages controlled by said cylindenvalve, a rotative valve-disk` bearing on said seat and adapted for bringing either or said portsinto communication either with the air supply pipe or with the outer air, a valfvaoperating stem connected With the valve and extending into said supply-pipe, a sleeve mounted to turn on said pipe and forming ahand-grip,

said sleeve beingconnected with said valve.

stem, and a sliding ring mounted on said airpipe adjacent to one end of the sleeve and provided with a non-rotative stop proj ectlon adapted to engage stop surfaces on said sleeve to limit the turning movement of the latter.

10. A neumatic motor comprising a power cy inder, a v a-lve for controlling the admission of pressure iiuid to and' its exit y arnese ating stein connected with said valve-disk and extending into said air-supplypipe and a rotative hand-grip mounted on the air-supply pipe and connected by means extending through a slotv in the said pipe with said .valve-disk for turning the latter.

11. A pneumatic motor comprisingI a poWercylinder, a valve for controlling the admission of pressure fluid to and its exit from said cylinder, an air-supply pipe and a combined reversing and throttle valve embracing a valve-casing with Which the supply-pipe is connected, and Which.y is provided with an outwardly-facing valve-seat,.and a rotative valve-disk-bearing on said seat, said valve-seat beingr provided with two eccen-4 trically-arranged ports, which are in communication with the cylindersupply passages controlled by said cylinder-valves7 with a central recess and with passages leadingfrom said central recess to the outer air, andthe said valve-disk being provided with an eccentrically-arranged port extending; therethrough and adapted to register with either of said ports in the seat by turning the disk,

and said. disk being provided in its bearing-v iaee with aradial groove or recess adapted to connect said central recess of the valve-seat with either 0i said ports in the valve-seat,

saidv dislcbeing adapted to close both of said ports il; the falveeseat when turned'to an=lintermedi osition. y l I In testimony that I claim'the'foregoing my ,invention I aiirr my signature, in presei of twowitnesses, this 14th day of July, A; E.

' RENHGLD A. NRNG.

, Viitnesses:

H. EA-sm CARRIE MusonLEn/l,

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