W. DORVAL. ROTARY STEAM ENGINE. APPLICATION FILED JAN.16. I919. 1 $322,882., Patented Nov. 25, 1919. 2 SHEETS—SH€ET I.

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INVENTOR WDorya/ , WILBEOD DORVAL, OF VERDUN, QUEBEC, CANADA. ROTARY STEAM-ENGINE. 1,322,882. Speci?cation of Letters Patent. Patented Nev,‘ 25‘, 1919; Application ?led January 16, 1919. Serial No. 271,444.

‘T0 all whom it may concern: pin 01" stud rigidly secured inv said cover Be it known that I, WILBROD DORVAL, a ’ and projecting inside said drum l2 and pref British subject, residing at 64: Church ave erably eccentric in relation to the center of nue, Verdun, in the Province of Quebec, in said drum 22 indicates a plurality of pad 60 the Dominion of Canada, have invented cer dles or blades loosely mounted on said pin tain new and useful Improvements in R0 21 by means of circular collars 23, said pad tary Steam-Engines; and I do hereby de dles or blades projecting through the slots in the bearings 19. The outer ends of said clare that the following is a full, clear, and 65 eXact description of the same. - paddles are preferably provided with soft 10 The present invention relates to rotary brass guards 24 which are adapted to steam engines, and it comprises certain im provide a steam tight friction joint be provements in engines of the character speci tween said paddles and the inner side of ?ed, as set forth in the following descrip the drum l2. tion, an embodiment of the invention being ’ In the inner face of the wall of the cas 15 illustrated in which: mg 2, at the top thereof, there is fitted a Figure 1 is a longitudinal section View of ?ber friction plate 25 in order to provide a the improved engine. steam tight joint. The operation of the‘invention will be Fig. 2 vis a cross section the cover plate 75 having been removed. . readily understood when it will be said that 20 Fig. 3 is a top view of the paddle at the steam as it enters the steam chest passes through one of the channels 9 and 10 ac tachment. ' Like numerals of reference'indicate cor cording to the position of the slide valve responding parts in each figure. and enters the steam chamber formed in In the drawings 1 is a supporting frame the casing when it will strike the blades or 80 25 which is constructed to form the circular paddles 22. The steam is discharged casing 2, and 3 is a central outwardly pro through the other channel and into the eX jecting sleeve provided on‘ its inner face haust pipe 11. with preferably a cross bushing 4. 5 is a An important feature of the invention is steam chest provided at the uppermost end the vanishing blades 22. Another impor 80 of said frame 1, and 6 is the steam inlet. tant feature is that very little steam will 7 is a slide valve here illustrated as on be used owing to the rather restricted steam erated bv the lever 8. and 9 and 10 are the chamber. inlet and outlet steam channels which lead ‘Vhat I claim as my invention is: from said chest into said casing 2 and are In a rotary steam engine, the combination 90 35 formed within the wall of said casing. 11 of a cylindrical casing having an inlet chan is a steameXhaust preferably disposed in nel for the steam formed in its circumfer termediate of said steam channels 9 and ential wall and provided at one side with 10 and adapted to communicate with said an outwardly-projecting axial sleeve; a ro either one by means of the sliding valve ,7. tating cylindrical drum within said casing 95 40 12 is a cup-shaped member or drum pro having an axial sleeve which ?ts within the vided centrally thereof with a sleeve 13 ?rst-named sleeve, the circumferential wall which is adapted to turn loosely in said of the drum being eccentric with relation sleeve 3, and 14% is the main shaft of the en to that of the casing and being formed with gine, which is fixed rigidly to said sleeve 18, a plurality of transverse, cylindrical aper 100 tures which open through the inner and 45 projecting outwardly therefrom and is pref erably journaled at its outer end in the bear outer faces of said drum wall; a horizon ing 15 which is supported by the bracket tal drive shaft having one end fastened in 16. 17 is a pulley mounted on said shaft. the second-named sleeve‘; a cover secured to The wall of the said drum 12 is also pro said casing; a pin fixed to said cover and 105 projecting laterally inward into said drum 50' vided with a plurality (three being illus trated in the drawings) of transverse, cy in eccentric relation thereto; a slotted cy ‘ lindrical apertures 18 which are adapted to lindrical bearing rotatably ?tted in each of said apertures; a plurality of blades, one receive the rotatable, slotted cylindrical 110 bearings 19., for each bearing, slidably engaged in the 20 is a cover adapted to be secured over slots in said bearings, each blade being pro the openend of said casing 2, and 21 is a vided at its inner end with a collar which 1,322,882

33 7 is loosely mounted on said pin; a‘ ‘steam opens through the adjacent Wall of the 10

chest mounted. upon the top of the casing chest; . V _ r , and into Which both channels directly open, Signed, at Montreal, Quebec, Canada, this said chest having an inlet for the live steam; 15th day of April, 1918. UK and, a slide valve in said chest for control . ling the passage of the steam through said ‘ WILBROD DoRvAL. channels having a steamv outlet Which is Witnesses: ‘ " ' adapted to be brought into communication HERVE DoRvAL, with either channel alternatively and which ' ' W. D. CONRoY.