US2250368A

US2250368A - Tube cleaner motor

Info

Publication number: US2250368A
Application number: US224395A
Authority: US
Inventors: Paul E Good
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-08-11
Filing date: 1938-08-11
Publication date: 1941-07-22
Anticipated expiration: 1958-07-22

Description

P. GOOD TUBE CLEANER MQIOR Filed Aug. 1l. 1938 Jllly 22,1941.

8 sneetsneel l wwwww NHUIIIIIUII f My July 22, 1941. P, E GOOD 2,250,368

TUBE CLEANER MOTOR Filed Aug. l1, 1938 8 Sheets-Sheet 2 TEQ'. 2

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' July 22,1941. I P. E. GQQD 2,250,368

TUBE CLEANER Moron Filed Aug.- 11, V1938v July 22, 1941.

y P. E. GOOD TUBE CLEANER MOTOR Filed Aug. l1, 1938 8 Sheets-Sheet 4 July 22, 1941. P. GOOD 2,250,368

TUBE CLEANER MOTOR FiiedAug. 11, 1938,

8 Sheets-Sheet 5 I mm1 goood July 22, 1941,.

P. E. GOOD TUBE CLEANER MOTOR Filed Aug. 11. 193g'. s'sneets-snet ,Hanni i y@ l "F lulm r 11111 A11/WMM m\ /4 /A\\ w Vi- .N Wd 6.0m 0V SOM.

July l'22,1 1941.

f P. EficsocD Y TUBE CLEANER MC FOR Filed Aug. 11, '193s `8 Sleets-Sheet 8 Nbawwmf. Q0..

Patented July 22, 1941 UNITED STATES Varr-str1* oF-FICE,-

Paul E. Good, Riverton, N. I,

` Application August 11, 1938, Serial No. 224,395

27 Claims.

This invention relates to tube cleaner motors and the like, and is an improvement upon the construction shown in my copending applications Serial Nos. 16,719, filed April 16, 1935, for Rotary motor, and 155,809 filed July 26, 1937, for 'Ifube cleaner motor, now matured into Patents Numbers 2,141,982 and 2,154,328 respectively.

The motors of such prior applications comprise a spirally grooved cylinder and a shaft bearing rotatable pistons for coaction with the grooves of the cylinder.

Important objects of the present invention are the elimination of exhaust through the cylinder of the motor with an accompanying reduction in the machining operations necessary in the construction of the motor; the provision of a motor which may be readily converted from simple to compound by the mere substitution of one shaft for another therein; the elimination of end thrust on the cylinder from internal pressure therein; the production of a construction in which the capacity is readily increased; the provision of means for insuring proper positioning of the pistons during periods of disuse of the motor; the use of a construction in which a governor is readily incorporated, and an arrangement facilitating assembly and repair of the device.

These and other objects I attain through the construction shown in the accompanying ,drawings, wherein,

Fig. 1 is a longitudinal sectional view through one form of motor constructed in accordance with my invention;

Fig. 2 is a typical transverse sectional View Y through the cylinder of the motor;

Fig. 3 is an edge elevation of one of the rotatable pistons;

Fig, 4 is a front elevation thereof;

Fig. 5 is a View of the stator body used in a simple motor;

Fig. 6 is a plan of the shaft assembly;

Fig. 7 is a perspective View of the plug utilized for closing the rear end of the piston slot;

Fig. 8 is a view similar to that of Fig. 6, but taken at right angles thereto;

Fig. 9 is an end elevation of the shaft assembly;

Figs. 1U to 14 are sections taken on lines III-I0, II-I I, I2-I2, I3--I3, and Ill- I4 respectively, of Figure 8;

Fig. is an end elevation of the motor;

Fig. 16 is an elevation of a shaft body for use in a compound type motor;

Fig. 17 is a plan of the shaft assembly for:a a compound type motor;

Fig. 18 is a View -similar to that of Fig."l7 but taken at right angles thereto; 'f J I,

Figs. 19 to 25 are sections taken on Ylines I9-I9, 2li- '20, 2l-2l, 22-22, 23-'23`, 2li-142B, and 25-25 respectively of Fig. 16;

Fig. 26 is a typical longitudinal sectionlyiew through the cylinder of a motor constructedlin accordance with my invention; I Fig. 27 is a sectional view illustrating a modified form of motor;

Figs. 28 and 29fare elevations of shaftassemblies interchangeably useable in themot'onof Fig. 27. j Fig. 30 is a sectional view illustratingfagovernor-controlled motor constructed in'V accordance with my invention; f 'A y Figs. 31 and 32 illustrate shaft .assemblies which Yare interchangeably useablein the motor Fig.30; I Fig. 33 is a sectional view showing armoto'r including the features of the constructions illustrated in Figs. 27 and 30; y Y Figs. 34 and 35 are elevations of--shaft 'assemblies interchangeably useable in the motor'v of Fig.33; .l

Figs. 36 and 37 are typical sectionalviews on lines 36-36 and 31-31 respectively of either of p Figs. 30 or 33; n p

Fig. A38 is a diagrammatic view illustrating the effect of pressure upon the rotatable pistons; Fig. 39 illustrates the type of plug used when a governor construction is employed; v

Fig. 40 is a typical section on lineklIIl--d of either of Figures 27 or 33; t Y p.

Fig. 41 is a perspective View illustrating` a-second type kof means for holdingthe pistons` in extended position;

Fig. 42 is an end elevation in Fig. 41; and y t, Fig. 43 shows the strip installed. 't t Referring now to the drawings, and moreparticularly to Figures 1 to 26 thereof, the numeral I0 generallydesignates a'stationary shaft'having at one end a hose connection II, and I2 a cylinder surrounding the shaft andadapted to rotate thereabout. The shaft has a tubularrear end I3` and is provided forwardly of this tubular end with a diametral slot ldhousing the` rotatable pistons I5, the lobes I6 of which 'are adapted to coact with the spiralgrooveslI'I of thecylinder I2, characteristic sectional n viewsl of lwhich. are shown in Figs. 2 and26 ofthe drawings. .The forward end of slot I4 is closed as at I8,4 while the rear end thereof is segregated from the tubular rear end of the shaft bya removable plugl I9.

of the vstrip shown At opposite sides of the diametral slot the wall of the shaft body is longitudinally grooved. These grooves may comprise merely an intake groove 2B and an exhaust groove 2l at each side of the slot, as shown in Figures 5, 6, and 8 to l2, or may comprise an intake groove 23a, the exhaust groove 2 la and an intermediate transfer groove 22, as shown in Figures 16 to 25. In either type of body the closed end i8 affords a shoulder 23 against which is abutted one end of a sleeve 24 which sleeve iittingly surrounds the body and has sealing engagement with the ribs between the grooves and between the grooves and slot and at its rear end sealing engagement with the surface of the body about the tubular rear end thereof. At its rear end, the sleeve is abutted by the washer 25 which is clamped thereagainst through medium of a threaded collar 26 at present shown as forming a portion of the hose'connection Il. This collar, extending into a groove 21 formed between threadedly coupled sections 12a and 12b of the cylinder, holds the cylinder in proper position with relation to the shaft assembly. Y

Sleeve 2li in the simple type of motor, as illustrated in Figures 5, 6 and 8 to 12, has diametrically opposed slots 28 for the passage of the lobes of the rotor and at each side of these slots has a series of intake ports 23 adapted to communicate with the several groove series of the cylinder and with the intake grooves 20 of the shaft body. It likewise has a series of exhaust ports 33 adapted to communicate with several groove series and with the exhaust grooves 2| of the shaft body which exhaust grooves discharge through the end of sleeve 24, as more clearly shown in Figure 9. The cylinder is preferably so formed as to provide an annular chamber 3| into which the exhaust gases escape and is formed with ports 32 through which they may move to the atmosphere.

In the form shown in Figs. 16 to 25, that is to say, the compound form, the sleeve has an intake port 29a at each side of the piston slots communicating with the groove 20a of the rotor body and with the first groove series of the cylinder. Likewise communicating with this first groove series are exhaust ports 36a which communicate with the intermediate transfer grooves 22 of the rotor. Intake ports 29h are provided which cornmunicate with the intermediate transfer grooves 22 and with the remaining groove series of the cylinder and exhaust ports 33a which communicate with such remaining series and with the exhaust grooves ila of the shaft assembly.

It will be noted that in this latter form the groove 22 actually constitutes an exhaust groove for the first groove series of the cylinder and that, as a result of conducting this exhaust to the remaining groove series the action is compounded, a double expansion of the propelling fluid being obtained. In each case the propelling iiuid is admitted to the initial intake groove 2 or 26a through ports 33 communicating with the interior of the hollow inner end of shaft assembly lll in advance of the plug I3,

Since, during idle periods, it will obviously be possible for the pistons to move inwardly into the shaft body and thus disengage from the cylinder grooves permitting bypass of air, I preferably provide spring-pressed followers 34 which engage against the inner walls of the sleeves and against the adjacent or inner edges of the pistons, constantly urging them outwardly with a slight pressure. t will be noted that with removal of the plug i9 these followers may be removed through the open mouth I3 of the shaft body, thus permitting the pistons to be moved into the compass of the shaft assembly so that the entire shaft assembly may be removed through the forward end of the cylinder simply by removing the end section 12a of the cylinder. It will also be noted that the shaft assembly Ill may be readily removed and substituted for by its counterpart lila and a motor thus converted from the simple to the compound type.

Attention is directed to the fact that in opervation there is no tendency whatever for the pisu tons to move inwardly. The fluid pressure is,

obviously, greater at one and corresponding sides of the piston discs since the intake passages only traverse one end of the spiral grooves l1. Pressure'applied at points A on these discs is, therefore, Vless than the pressure at points B thereon (see Fig. 38) with the result that both discs tend to bind at a common point C. With the direction of rotation as indicated by the arrows of this figure, the discs will, therefore, tend to swing outwardly and maintain their engagement with the walls of the grooves.

In Figures 27 to 29 and 40 I have illustrated a method of increasing the capacity of the forms of the invention just described as respects the rotation of the tool-bearing element. In those figures the tool is carried by a shaft extension 35 of the cylinder proper. In the figures now under discussion a casing 36 is provided in which an abbreviated cylinder 31 is arranged between

thrust elements

38 and 39 carried by the casing. The thrust element 39 is in the form of a washer abutting a shoulder formed in the casing and the adjacent end of the cylinder. The thrust element 38 is in the form of a connecting annulus connecting sections 36a and 36h of the casing. This annulus supports a plurality of beveled pinions 40 which engage respectively an annular bevel gear 4I on the cylinder 31 and a similar bevel gear 42 fixed to an extended portion of the shaft body 43. Shaft body 43 is, with the exception'of its extended portion, identical with the shaft body I0 hereinbefore described and the bevel gear 42 performs the function of the washer 25. It will be obvious that upon rotation of cylinder 31 the pinions 40 will be caused to rotate and roll upon the stationary gear 42, with the result that the casing 36 will be caused to rotate at one-half the speed of the cylinder. Therefore, with grooves and rotatable pistons of the same size and type as those shown in the previously discussed form, the capacity of the motor will be exactly doubled. Even with a reduction in size such as is necessary to keep the over-all size of the casing to the same size as that of the cylinder in such preceding gures, the capacity may be materially increased. In this type of construction, the cutter D is driven by the slower moving elements; i. e., the casing, and the casing is provided with exhaust ports 32a through which the gases may escape to atmosphere from the annular chamber 31a provided between the end of the casing and the cylinder. The end of the shaft assembly is, preferably, provided with an axial bearing extension 44 engaging in a socket 45 formed in or carried by the end wall 46 of the casing.

Obviously, the shaft assembly of Figure 28 which is adapted to the construction shown in Figure 27 for use as a simple motor may be substituted for by the shaft assembly 43a of Figure 29, in which event the motor is converted to a vblocks -byY compressing vthe cable =within A grooves f66f-for1ned^in Vthe-blocks. -An end blockof-ithe Vseriesemployed-with -any of the previously de- 5 scribed types offmotors is vformedfwith a bayonet .withdraw the -train of blocks from Athe piston islot. v-Obviouslyfinfa structure of this type the pressureexertedbythe blocks will be butslight, fand-will in no Vvmanner interfere with operation I compound lmotor, 4as #in Athe' constructions -pre- .viously-described.-^ f

`In' -Figures' 30 4to 32, Ilhave illustrated the --mea-ns for applying -a-governor tofa 'construction -of fthiswcharacter; -In this 'form 4of-the invention the cylinder -4'1l is Vformedin -the two sections, as usual,v but-the inner section 41a Visfconsiderably elongated andlis provided with an annular'internal cavity48.- 4`Adjacent this cavity -a'plurality each receiving-'a governor element 50 of the, type shown in mycpri-or-appli'cationSerial "No,

Theplug l9a for the end Aof ing air by rway of-ports-55 in the thimbles and of the shaft and communicating-with the hollow interior thereof and with the intake ports of the shaft assembly. The valveproper, indicated at 51, is :constantly urged by -a spring'JB` to a.V position wherethe ports ofthe valvefand-thimbleUO align with one Aanother and it will ybeY obvious lthat upon apredetermined increase in the speed of cylinder 41-thesevalves will move outwardly cutting olf-or reducing the 'supply of air to the intake ports ofV theshaft assembly.

Thethimbles 5l may be llocked-in position by 4.set screwslilfandretaining elements Sil-"(-Fi-g. A36) are-preferably provided lto-prevent the nvalves from escaping --lwhen -the shaft assemblyE-Z'is `-of radial sockets 49 areformed, `these vsocketsfl() thecavity-48-to ports 56 -formeddnY the` extensior1=...5v

Withdrawn. These retaining elements may bein the for-m of angle-ended pins having a loose driv- `ing litl with-bores 6I formed in the body sol that `they may be-=rotated to permit-removal and replacement of lthe lvalves and springs.

It will-be obvious that 'the shaft Vassembly other than the variation in its "rear structure hereinbefore-described, may be Yeither 'that of :Figure 5.of the drawings, inlwhich event a simple` motor provided, or that of Figure 16, in l 'which event a `compound ymotor is provided,l these structuresbeing illust-rated vin A'Figures '31 and 32 of 'the drawings respectively.l

In Figures-33 to 35 I Vhaveillustrateda method of adapting the Agovernor construction Ato the construction-illustratedinFigs. 27 to 29. It will be obvious that the construction shown in these gures differentiates from the construction rshown in Figures 27 to 29 solely in the fact-that the inner section ofthe casingS-Z `insteadof 'corresponding to the section 3622 ofthe casing of i Figure 27 has a construction similar to that of the inner end 41a of the cylinder in Figure 30 supporting the governor elements 50. It is obviously, likewise, necessary `to further elongate n the extension of the shaft assembly 63. 'This shaft assembly vE53, other than in the extension construction, may be identical with either of the shaft 'constructions of 'Figures 5 and 16 hereinbefore described, as suggested in FiguresBl and,

Figures 4-l, 42 and 43 illustrate a modified form of means for maintaining Ithe rotary pistons l5 in their extended positions. In these figures I have `shown aseriesof blocks ,64.-con.

nected by a flexible cable secured to the slot-61lwithin which a hook maybe insertedV to -ofthepistons @Since the.constructions-hereinbefore described are,A obviously, capable of considerable modificationwithout in 4any manner departing from the spirit of mylinvention, I do-notwishto'be understood as limiting myself thereto except as-hereinafter-claimed. y I

r`I-claim -1.In arotary Vmotor or the like, relatively rotatable cylinder and shaft elements, 4said `cylinder having in its surface a plurality ofcircumferential series `of spiral grooves and said shaft-mounting rotatable pistons for each groove series having lobes blocking -said grooves from lend:to end as the `.elements arerelatively-rotated, said `shaft comprising a body por-tionhaving intermediateits-ends a series of grooves comprising `supply lgrooves-and `exhaust grooves and further having ra slotgmounting said pistons, and-sleeve means sealingly engaged with the ends of the bodylportionand-the surface ofthe body portion between said grooves and hbetween .said grooves and slots, said sleevefmeans having slotsforthe passage vof theilobes of said pistons and having 4ports .formed therein, said ,ports comprising sup- V ply .ports for the `delivery of .pressure to the .grooves of thecylinder from the supply grooves of the lshaft .andexhaust ports communicating with the grooves of the cylinder for the exhaust ,of ,pressure fluid from thegroovesof the cylinder .to .the exhaust `groovesof the shaft.

52. Ina rotary motor or the like, relatively yro- .tatablecylinder and shaft elements, said cylinkder having ,in its,surfaoe a plurality of 4longitu- .dinally spaced ,series of spiral 4grooves and said shaft mounting rotatable pistons having lobes kblockngsaid grooves of eachseries fromrend to -end .as ;the1e1 em ents are relatively rotated, said shaft comprising a lbody portion having intermediate itsends a plurality of grooves comprisingsupply vgrooves, exhaust ygrooves and intermediate grooves ,and further having a s lot mounting saidvpistons, sleeve means sealingnly .engaged .with the ends of the body portion lwith the surface of the ybody portion between said @grooves and between said grooves and slots, said sleevemeans vhaving slots'for the passageA of the `lobesof lsaid pistons and supply ports Vfor the delivery of pressure to the grooves of one of the groove series `of the cylinder communicating with said supply grooves, exhaust -ports communicating with the grooves of said seriesfor the Y,exhaust of pressure fluid from the grooves thereof -to said intermediate grooves, supply ports for -supplying fluid from the intermediate grooves rtothe remaining groove series of the cylinder and exhaust ports for conducting lluid from `the grooves of said remaining groove series of the cylinder Vto the exhaust grooves of the shaft.

.3. A motor as claimed in claim-2 wherein the shaft is stationary and the cylinder rotatable.

4. In a rotary motor or the like, relatively rotatable `cylinder land shaft elements, the outer `,element comprising the cylinder and being'provided on its inner surface with a circumferential series of spiral grooves, means to introduce and having lobes meshing with said grooves and blocking said grooves from end to end during their passage therethrough, the shaft having a slot in which the body portions of the pistons are disposed, the inner portions of the piston elements being in confronting overlapping relation, said piston elements rotating in opposite directions upon relative rotation of said inner and outer members, and spring-pressed followers engaging said pistons and urging them radially.

5. In a rotary motor or the like, relatively rotatable cylinder and shaft elements, the outer element comprising the cylinder and beingprovided on its inner surface with a circumferential series of spiral grooves, means to introduce fluid pressure to said grooves and exhaust fluid pressure therefrom, the shaft tting within the cylinder, rotatable pistons carried by said shaft and having lobes meshing with said grooves and blocking said grooves from end to end during their passage therethrough, the shaft having a slot in which the body portions of the pistons are disposed, and spring-pressed followers engaging said pistons and urging them radially.

having lobes meshing with said grooves and blocking said grooves from end to end during their passage therethrough, the shaft having a slot in which the body portions of the pistons are disposed, the inner portions of the piston elements being in confronting overlapping relation, said piston elements rotating in opposite `directions upon relative rotation of said inner 6. In a rotary motor or the like, relatively rotatable cylinder and shaft elements, said cylinder having in its surface a plurality of circumferential series of spiral grooves and said shaft mounting rotatable pistons for each groove series having lobes blocking said grooves from end to end as the elements are relatively rotated, said shaft having a series of passages comprising intake and exhaust passages and having ports formed therein, said ports comprising supply ports for delivery of pressure to the grooves of the cylinder from the supply passages of the shaft and exhaust ports communicating with the grooves of the cylinder for the exhaust of fluid pressure from the grooves of the cylinder to the exhaust passages of the shaft.

7. In a rotary motor, relatively rotatable cylinder and shaft elements, said cylinder having in its surface a plurality of circumferential series of spiral grooves and said shaft mounting rotatable pistons for each groove series having lobes blocking said grooves from end to end as the elements are relatively rotated, said shaft having a series of passages comprising intake passages, exhaust passages, and intermediate passages, and further having ports, said ports comprising supply ports for the delivery of pressure to the grooves of one of the groove series of the cylinder from the intake passages of the shaft, exhaust ports communicating with the grooves of said series for the exhaust of fluid pressure from the grooves thereof to said intermediate passages, supply ports for supplying fluid from the intermediate passages to the remaining groove series of the cylinder and exhaust ports for conducting fluid from the grooves of said remaining groove series of the cylinder to the exhaust passages of the shaft.

8. In a rotary motor or .the like, relatively rotatable cylinder and shaft elements, the outer element comprising the cylinder and being provided on its inner surface with a circumferential series of spiral grooves, means to introduce fluid pressure to said grooves and exhaust fluid pressure therefrom, the shaft fitting within the cylinder, rotatable pistons carried by said shaft and and outer members, and meansV within the slots limiting inward radial movement of said piston elements while permitting relative axial movement of the cylinder and shaft.

9. In a rotary motor or the like, relatively rotatable cylinder and shaft elements, the outer element comprising the cylinder and being provided on its inner surface with a circumferential series of spiral grooves, means to introduce fluid pressure to said grooves and exhaust uid pressure therefrom, the shaft fitting Within the cylinder, rotatable pistons carried by said shaft and having lobes meshing with said grooves and blocking said grooves from end to end during their passage therethrough, the shaft having a slot in which the body portions of the pistons are disposed, and means within the slots limiting inward radial movement of said piston elements while permitting relative axial movement of the cylinder and shaft.

10. In a rotary motor or the like, relatively rotatable cylinder and shaft elements, the outer element comprising the cylinder and being provided on its inner surface with a circumferential series of spiral grooves, means to introduce fluid pressure to said grooves and exhaust fluid pressure therefrom, the shaft tting within the cylinder, rotatable pistons carried by said shaft and having lobes meshing with said grooves and blocking said grooves from end to end during their passage therethrough, the shaft having a slot in which the body portions of the pistons are disposed, said pistons being of a size such that they may be completely withdrawn within the slot of the shaft, and means in said slot for holding the pistons in extended position.

11. In a rotary motor or the like, relatively rotatable cylinder and shaft elements, the outer element comprising the cylinder and being provided on its inner surface with a circumferential series of spiral grooves, means to introduce fluid pressure to said grooves and exhaust fluid pressure therefrom, the shaft fitting within the cylinder, rotatable pistons carried by said shaft and having lobes meshing with said grooves and blocking said grooves from end to end during their passage therethrough, the shaft having a slot in which the body portions of the pistons are disposed, said pistons being of a size such that they may be completely withdrawn within the slot of the shaft, and removable elements within said slot for holding the pistons in extended position.

l2. In a rotary motor or the like, relatively rotatable cylinder and shaft elements, the outer element comprising the cylinder and being provided on its inner surface With a circumferential series of spiral grooves, means to introduce fluid pressure to said grooves and exhaust fluid pressure therefrom, the shaft fitting within the cylinder, rotatable pistons carried by said shaft and having lobes meshing with said grooves and blocking said grooves from end to end during their passage therethrough, the shaft having a slot in which the body portions of the pistons arel disposed, said pistons being of a size such that they may be completely withdrawn within the slot` of.the shaft, and spring-pressed followers within said slot for urging the pistons radially, said shaft having a tubular end through which fluid pressure may be introduced to the motor, the end of said slot communicating with said tubular end, and a removable plug closing the rear end of the slot removal of which permits' withdrawal of said followers.

13. In a rotary motor or the like, relatively rotatable cylinder and shaft elements, the outer element comprising the cylinder and being provided on its inner surface with a circumferential series of spiral grooves, means to introduce uid pressure to said grooves and exhaust fluid pres- Sure therefrom, the shaft tting within the cylinder, rotatable pistons carried by said shaft and having lobes meshing with said grooves and blocking said grooves from end to end during their passage therethrough, the shaft having a slot in which the body portions of the pistons are disposed, said pistons being of a size such that they may be completely withdrawn within the slot of the shaft, and means in said slot for holding the pistons" in extended position, said shaft having a tubular end through which fluid pressure may be introduced to the motor, the end of said slot communicating with said tubular end, and a removable plug closing the rear end of the slot remo-val of which permits withdrawal of said means.

14. The device of claim 1 in which the shaft is stationary.

15. The device of claim 6 in which the shaft is stationary.

16. A motor as claimed in claim 7 wherein the shaft is stationary and the cylinder rotatable.

1'7. In a rotary motor or the like, relatively rotatable cylinder and shaft elements, the outer element comprising the cylinder and being provided on its inner surface with a circumferential series of spiral grooves, means to introduce iiuid pressure to said grooves and exhaust uid pressure therefrom, the shaft fitting within the cylinder, rotatable pistons carried by said shaft and having lobes meshing with said grooves and blocking said grooves from end to end during their passage therethrough, the shaft having a slot in which the body portions of the pistons are disposed, spring-pressed followers within said slot for urging the pistons radially, said shaft having a tubular end through which iiuid pressure may be introduced to the motor, the end of said slot communicating with said tubular end, and a removable plug closing the rear end of the slot removal of which permits withdrawal of said followers.

18. In a rotary motor or the like, relatively rotatable cylinder and shaft elements, the shaft elements being two in number, said cylinder having in its surface a plurality of circumferential series of spiral grooves and said shafts mounting rotatable pistons for each groove series having lobes blocking said grooves from end to end as the elements are relatively rotated, each of said shafts comprising a body portion having intermediate its ends a series of grooves comprising supply grooves and exhaust grooves and further having a slot mounting said pistons, and sleeve means sealingly engaged with the ends of the body portion and the surface of the body portion between said grooves and between said grooves and slots, said sleeve means having slots for the passage of the lobes of said pistons and having ports formed therein, the ports of the sleeve means of one shaft comprising supply ports for the delivery of pressure to the grooves of the cylinder from the supply grooves of the shaft and exhaust ports communicating withthe grooves of the cylinder for the exhaust of pressure fluid from the grooves of the cylinder to the exhaust grooves of the shaft, the sleeve means of the other shaft having slots for `the passage of the lobes of said pistons and supply ports for the delivery of pressure to the grooves of one of the groove series of the cylinder communicating with said supply grooves, ports communicating with the grooves of said series for the exhaust of pressure fluid from the grooves thereof to the remaining groove series of the cylinder and exhaust ports for conducting fluid from the grooves of said remaining groove series of the cylinder, said shafts being interchangeable and interchanging thereof converting the motor from simple to compound.

19. In a rotary motor or the like, relatively rotatable cylinder and shaft elements, said 'cylinder having in its surface a plurality of circumferential series of spiral grooves and said shaft elements mounting rotatable pistons for each groove series having lobes blocking said grooves from end to end as the elements are relatively rotated, said shaft elements being two in number, one of said shafts having ports for delivery of fluid pressure from a suitable source to each of the grove series of said cylinder and exhaust ports for the exhaust of iiuid pressure therefrom, the other of the shafts having intake ports for the delivery of fluid pressure from said source to the ports of the first of the groove series and transfer ports for transferring iiuid pressure from the preceding groove series to a succeeding groove series, the last of the groove series being in communication with exhaust ports for the exhaust vof fluid pressure therefrom, said shafts being interchangeable whereby to convert the motor from simple to compound.

20. A device as 'claimed in claim 18 wherein the employed shaft is stationary and the cylinder rotatable.

21. A device as claimed in claim 19 wherein the employed shaft is stationary and the cylinder rotatable.

22. In a rotary motor or the like, relatively rotatable cylinder and shaft elements, said cylinder having in its surface a plurality of circumferential series of spiral grooves and said shaft elements mounting rotatable pistons for each groove series having lobes blocking said grooves from end to end as the elements are relatively rotated, said shaft elements being two in number, one of said shafts having ports for y delivery of fluid pressure from a suitable source to each of the groove series of said cylinder and exhaust ports for the exhaust of iiuid pressure therefrom, the other of the shafts having intake ports for the delivery of fluid pressure from said source to the ports of the rst of the groove series and transfer ports for transferring fluid pressure from the preceding groove series to a succeeding groove series, the last of the groove series being in communication with exhaust ports for the exhaust of fluid pressure therefrom, said pistons being of a size such that they may be withdrawn within the shaft, and said shafts being interchangeable whereby to convert the motor from simple to compound.

23. A device as claimed in claim 22 wherein the employed shaft is stationary and the cylinder rotatable.

24. A device as claimed in claim 1 wherein the cylinder is rotatable and passages are provided in the wall thereof for the admission of` air to the interior of said sleeve, and centriiugally movable Valve elements carried by the cylinder for controlling the movement of air through said passages. l

25. A device as 'claimed in claim 2 wherein the cylinder is rotatable and passages are provided in the wall thereof for the admission of air to the interior of said sleeve,` and centrifugally movable valve elements carried by the cylinder for controlling the movement of air through said passages.

26. A structure as claimed in claim 4 wherein the cylinder is rotatable and includes passages for conducting fluid pressure to the grooves thereof, and centrifugal means carried by said cylinder for controlling the effective area of said passages.

27. A structure as claimed in claim 6 wherein the cylinder is rotatable and includes passages for conducting iluid pressure to the passages of the shaft, and centrifugal means carried by said cylinder for controlling the effective area of the cylinder passages.

PAUL E. GOOD.