US1305966A - Rotary gas-engine - Google Patents

Description

J. W. GREEN.

ROTARY GAS ENGINE. APPLICATION Huso DEc. 22. 1916.

latenfed June 3, 1919.

3 SHEETS-SHR( I.

J. W. GREEN.

ROTARY GAS vENGINE. APPLICATION FILED DEC. 22. |916.

l ,$05,966. Patented June 3, 1919.

3 SHEETS-SHEET 2.

w n Q iIIIIIIIIIIIIIIII IIIIIIIIIIIIIINIIUNM 5% N 0 "z v v1. w. GREEN. ROTARY GAS E NmNE.

APPLICATION FILED DEOZZ. IQIG. l 1,305,96. .IRIRnfedJune 3, 1919.

3 SHEETS-SHEET 3.

a z 'gi 2l. Nukem y/CornfzLIr-nke '/Exp. Comp. Comf. Explo. EXP. Exh.

JAMES WILLIAM GREEN, OF PORTLAND, OREGON.

ROTARY GAS-ENGINE.

Specification of Letters Patent.

Patented J une 3, 1919.

Appiication ined December 22, 191e. serial No. 138,397.

To all whom t may concern Be it known that I, JAMES WILLIAM GREEN, a citizen ofethe United States, residing in the city of Portland, county of Multnomah, and State of Oregon, have invented certain new and useful Improvements in Rotary Gas-Engines, of which the following is a specific-ation.

My invention relates to rotary gas engines, and it has among its salient ,objects to provide an internal combustion engine in which are a plurality of revolving rotors, or vanos adapted to be intermittently and alternately driven forwardly, and' also to be intermittently and alternately locked against backward movement, whereby to form an abutment between which, and the rotor, or vane, next to be moved, the explosion takes place and drives the movable rotor. or vane, forwardly a. partial rotation. Said latter vane, or rotor, is then locked against backward movement and it becomes the abutment between which, and said first rotor, or vane, another explosion takesY place and drives said firstA rotor forwardly a partial turn. Another object of my invention is to provide in a. device of the character referred to a construction in which the intake of the explosion mixture, the compression, the ignition, or spark, and the exhaust are automatically controlled by the revolutions of the rotors, or vanes, and can take place at any point around the arc of a circle.

In order that others may understand my invention I have illustrated one practical form thereof in the accompanying sheet of drawings in which,-

' Fi 1re 1 is a longitudinal vertical sec- 'tiona 'viewthrough my invention;

Fig. 2 is aivertical cross sectional view taken on `line 2-'r2 of Fig. 1; Fig. y3 is a' vertical cross taken on line 3'-*3-.of Fig.v 1;

Fig. 4 is a veitical, crosssectional view taken on line 4-4 of Fig. 1; Fig. 5 is a vertical, cross taken on line 5--5 of Fig.: 1;

sectional View Fig. 6 is a top plan view of the emloodi-v ment of my invention, as here shown for purposes of illustration;

Fig. 7 is a vertical cross sectional view taken through the rotor casing, on line -7'-7 of Fig. 1;

Fig.` 8 is a side elevation of one ofthe rotors, or vanes, of my invention;

thereof sectional view Fig. 10 is a side elevation of an apertured bearing sleeve, which ts over the righthand end portion of the rotor shown in Fig. 8;

Fig. 11 is a vertical cross .sectional view taken on line 11-11 of Fig. 10;

Fig. 12 is a side elevation partly in section of the exhaust valve mechanism;

Fig. 13 is a fragmentary top plan view thereof;

Fig. 14 is a face View of the base thereof, with the mechanism removed therefrom;

Fig. 15 is a side elevation of another rotor,

or vane, with the upper portion shown in section; v

Fig. 16 i-s an end view of said rotor.

Fig. 17l is an end view taken on lines 17'- 17 of Fig. 1, showing two traveling contact members which control the sparks; and

Fig. 18 is a similar view taken on line 18-18 of Fig. 1, showing two coperating contact devices.

Figs. 19, 20, 21 and 22 are diagrammatic illustrations, showing in a general way, a cycle of operation; that is,-

Fig. 19 shows the relative positions in the` rotor cylinder of the intake, the compression, the explosion and the exhaust. while Figs. 20, 9.1 and 22 show the .same successively changed relative positions of these functions.

In my invention, as here illustrated, I have shown two rotors, or vanes, arranged crosswise of each other, X-fashion, and turning about a common axis, said rotors. or vanes, being notched at their central portions, however, so as to interit 'with each other, whereby their vane portions come together latwise at diametrically opposite sides of their centers. I have also made provision for automatically locking each of said rotors, or vanes,I against backward movement, and in the present embodiment of the invention this means for so locking said rotors, or vanes,'is accomplished through the hub, or sleeve, portions. I have also provided the intake and exhaust ports through the hub, or middle portion of one of said rotors, and to this end the hub, or bodyportion' thereof, is chambered, as hereinafter and exhaust ports, with proper connections for taking in the explosive mixture at any point of rotation of said rotors, through any one of said ports, and afterward exhausting the burnt gases therefrom through the same ico described, to provide the necessary intake il 'all operating the same. :v 'an-intake port, is closed Each port serves as during compress1on '4 '-and explosion and is then opened as-an eX- .their opposite ends,

' which projects over the hub, or body,

v'fhausl port,.a`nd then asan intake`port.

1 will -now describe in detail the embodiment of my invention. as here illustrated on the accompanying three. sheets of drawings.

Referring to Figs. l, 6 and 7, 1 designates a drum-like casing fhaving formed on one side an annular flange 2. Rotatably mounted within said casing 1, are two rotors, 3 and 4, Figs. 8 and 16, having, respectively, the vane portions 3a and 3b, and 4 and 4b. Referring more particularly 4to Figs. l, 7 8 and l), the rotor 3, is shown in side elevation in Fig. 8, and in end elevation in Fig. 9, and is provided with the hub-like extension 3", provided with five pairs of expansion rings, as 3d-3d. Said hub-like extension is chambered longitudinally at its four quarters, circumferentially, as at 5, A6, 7 and 8,

.which chambers open out at their right-hand ends, respectively, between the pairs of expansion rings, as at 5a, 6a, 7a and 8, and atsaid chambers open out adjacent the vane portions 3al and 3b, as at 7b and 8", as clearly shown inP Figs. 7 and 8, and also in Fig. 1.

Said rotor 3"also has a reduced, hub-like extension 3e, extending out to the left-side .of the vanes'3a and 3*', as clearly shown in Figs. l and 8. The rotor 4 is mounted upon this extension 3e of the rotor 3, and has an intel-fitting connection with the rotor 4, whereby the vanes 3a and' 3* of the rotor 3, and vanes 4 and 4b of the rotor 4 are ln'ought into overlapping relationship with each other, or so as to occupy the same path of rotation, that is, the vane portions 3 and 3* of the rotor 3, have an extended width porporof the rotor 4, r'have a breadth extension which projects over the body, or middle portion of the rotor 3, as will be understood by reference to Figs. 8 and 15. A shaft 10, is extended through the hub, or central portions olf the rotors 3 and 4, as `clearly shown in Figs. 1 and 7,

tion of the rotor 4, and the vane tions 4a and lb said shaft being provided at one end with driving device 15, is

,I end of the'sleeve, or l 'Gai-,of the i'otoi"'3,"1s an` irregular eccentrlc drivan arm 11,"keyed thereto, as at 12, and provided with forks v13--13, at its opposite ends adapted to. receive the screw bolts 14.--'l4, which are screwed into the body of an eccentric locking device 15, shown in longitudinal section in Fig. '1, and in cross section in Fig. 4, said driving device 15, turning on the'v extension 3", and being scoured by means of set screwslG-l, to the hub, or body portionof the rotor 4, whereby said eccentric secured to and, turns Mounted on the outer hub-like, extension 3,

with Isaid rotor 4;

ing device 17, shown in section in Fig. 1, and in end elevation in Fig. 3, said device 17 having neck-like portions 1717a, which support the eccentric cam devices 17h-p17, as clearly seen in Fig. 3, it being understood that the screw bolts 14E-14, extend along adjacent the neck portions 17a-17, of said driving device 17, whereby the latter can' only turn a partial revolution at a time in the direction of the dotted -linearrow, Fig. 3, after the arm 11, together with the screwbolts 111-14 and the member 15, have been turned a partial revolution.` ing or holding rollers 18418, is mounted between the eccentric cam faces 15a*15a, of the member 15, and the flange 2, on the side of the rotor casing l, as will be seen in Fig. 1. A main driving shaft 19, is provided with a drum, or bell, tially the same diameter as is the annular vflange 2, on the side of the rotor casing l, and is placed over close the end of the shaft l10, the arm 11, and t-hevdevices 15 and 1.7, and forms, as it were, an extension of. said annular flange 2, as will be clearly undcrstoodfrfom Figs. l and 6. Also vmounted between the eccentric cam faces 15- 15a ofthe member 15, is a pair of driving rollers-- 214-21, normally pressed outwardly by means of springpressed plungers 299-22, .as clearly shown in Fig. 4, whereby d l driven in one direction it. will be locked to and drive said bell or drum 20, but will be free to turn in the opposite direction without turning said drum or bell 2O on the shaft 19. Mounted between the eccentric cam faces 17"-17b, of the member 17. and the inside of said bell, or drum, 20, is a pair of driving rollers 23-23, also normally held in locking position by means of spring-pressed plungers 23-23, as will be clearly seen from Fig. 3. Thus by means of the rollers 23*Q3, the driving device 17, secured to the extension 3e, of the rotor 3, makes it possible to lock the bell or drum 20, of the main driving shaft 19 to said rotor 3 for inter- A pair of lock- I portion 20, of substan' and around, so as to inwhen said device 15,.is

mittently driving said bell 20 and its shaft 19 in one direction, while the rollers 21-21, between said bell or drum 20, and the driving member 15, secured to the hub of the .rotor Ll, makes it possible to lock said rotor n'iovemenr. or rotation by means of a pair of i rollers 24e-24, operating onl the opposite' end of its hub or extension 3., To this end lthere is keyed., asat 27, to tirer ani-eccentric locking' simi lar hold ing end' of said .extensioii device 25, similar to lthe device 15, shown in Fig. 4, and having similar eccentric cam faces between which and an annular ring, or collar 26, secured to the casing, hereinafter referred to, said rollers 24-24, operating to lock said rotor 3, against any backward movement.

Mounted at the side of the rotor casing 1, around the extension 30,' of the rotor 3, is a cylindrical casing 30, shown in section, Fig. 2, and adapted to be secured to the side ot the rotor casing l, as by means of bolts 31-31, said cylinder casing 30, having t'ornied therein a. series of annular spaced cha1nbers,ias 32, 33, 34 and 35. Mounted within said cylindrical chamber is a cylindrical skeleton, or apertured bearing sleeve 3G, shown in side and sectional views in Figs. l() and 11, the apertures in said bearing sleeve extending circumferentially therein and being spaced apart so as to register with the annular chambers 32, 33, 34 and in said cylindrical casing 30, as will be clear from Fig. 1. Said a'pertured sleeve, as will. be noticed, tits .closely around the extension 3c of the rotor 3, and the expansion rings 3d thereon, the apertures in said bearing sleeve registering with the spaces between the pairs of extension rings.

Thus it will be understood that the different chambers 5, (l,

*i vot' the -rotor 3, open at their ends 5% 6a, 7a

lindrical casing 30.

through the apertures and into the annular chambers 35.- 34, 33 and 32, in .the cy- In Fig. 2, the chamber in said extension 3c, is shown.- with its opening 5 opening through v.t he.apertured ring '3(3, into the annularchainbe `35.. cylindrical casing 30, is provided'atone and' Sa, respectively,

-side with a flat flange-like face 30a, to which is adapted to be attached the'v exhaust valve Figs. 12, 13 and 1 4,

mechanism, shown in and hereinafter again referred to.- The annular chambers 32, 33, 34 and 35, in said cylindrical casing, have outlet ports through said fla-nge or face 30a, Fig. 2, which-,outlet ports are' designated 3,2, 33t, 34a and 35,

the outlet port 35a, being shownin f ull lines injsaid- Fig. 2, lwhile the other outlet ports areindicated invdotted lines. Secured flativise to said aiige,'o`r face,-30. is the exf haust l.valve mechanism, shown in Figsf'12 1 .35?, through "Said lllange said base plat mnected.v

fore, designa v65,

and 13, .saidexhaust valve vmechanism being shown in place in 4top and'coniprisiug a base plate 40, having the bolt. holes 40E-40", screw bolts 40"-.-10 Fig. 1 2. plate also has four exhaustapeijtures' there? through, which correspond and register with' the exhaust apertures 322332145 nd tace 30", to.

the-v exhaust 'apertures through vsaid 7 and 8, in the extension 3"( plan view in Fig. 6,

therein, to receive the.

Said base `I have,"there A h'- Athe same reference' and 44 control, respectivelygjthe,exhaust out-V v l lets through the exhaust ` apertures 35a, 32a and 33a, intol a common exhaust chamber, 45,l from. which`i.;.is :an'joutlet opening formed by the'v extension; 46,. as shown in FigsrlQ and 13. Said valves'41, 42, 43 and V44, are 4 mountedon piston rods 41, 42a, 4.31

and 4'4a (not, shown) connected with pistons 41h, 42b (not shown), 43 and 44h, working in small cylinders 41', 42" (not shown), 433 and 44C. Said piston iods41a, 42a, 43a and 44a, extend in a reduced size through said valves 41, 42, 43 and 44, and Vout through packing nuts 47., 48, 49 and 50, and are normally pressed inwardly, whereby lto seat Said valves, by springs 51, 52, 53 `and 54, on thenuts 40".

Thus it will be understood, for example, that any explosion through one ofthe ex-f haust ports 32a, 33a, 34a or 35a, above the valve adjacent thereto, will-force the piston,` which is adjacent thereto,

and whose Cyp the next valve in o' der, against the tensioir ot its spring, `thus allowing the burnt gases from the .previous explosion to be exhausted throughsaid exhaust port into said genera-l chamber 45, landout through the outlet '46. Toshe morespeeifidany explosion through the exhaustV port 35a, above valve 41, Fig. 12, will force piston'43?, so as to open valve '43, against the tension ot its spring 53, and allow burnt gases tobe exhausted'through exhaust 'opening-j 32, and: intof-the'general chamber 45.] l A' Referring now to Figs. 2 and3 there is mounted upon the top of the fcylindricalv casing 30, by means ot the bolts 60-G'0, a box-like member `G1, forming an inlet chamber62, into which is provided a general inlet indicated'at G3. Spring-closed valve and valve stems, designated in a general way 64, 65, 66 and 67, control the communication trom the inlet chamber 62, to the respective annular chambers 35, 3 4, 33 Aand 32,v of the cylindrical casing 30. The general construction and arrangement of these respective valves64, 65, 66 and 67 is clearly shown in the sectional view, Fig. 1, and need not be described more in detail. It will thus vbe understood `hat Va supply of explosive mixture connected tothe general inletl 63,'. passes into the general chamber 62, inthe iiol ' casin box 61, and as suction is applied through any of the passage chambersv 5, 6, 7 and 8, extending through the rotor extension 3, respectively, to the annular 4chambers 35, 34, 33, and 32, that said valves 64, 65, 66 and 67 will yield.

Also mounted in the top of the cylindrical 30, and abovethe respective annular cham' ers 35, 3ft, 33 and 32, are spark plugs 70, 71, 72 and 73, shown in top plan View ir Fig. 6, in which-figure also it is shown that said' spark plugs 'are' electrically connected in pairs, spark plugs 70 vand 72 being conn eted Atogether to wire 74,v so as to spark at Sametime, and spark plugs 'l'v'andv 73 being electricallyconnected together by the wire 75, to spark at the same time, 'said WreS'7fta`I'1d`75 leading to andv connecting, respectively, with contact rings 76.and 77. The'contact rings 7.6 and 77 aresupported at a space'l apart upon sleeves 78 and 79, of in'.- sula-ting material upon bolts 80 and 81, which are secured to a ring 82, attached to the member 25, keyed to ,the end of the hub extension 3c', of the rotor 3, whereby said contact rings 76 and 77, revolve withy said rotor.- Two contact members, or prongs, 83 and 84, are carried by said contact rings 76 and 77 contact member 83 being connected to Contact ring 7 6, and being insulated "from ring 77 although passing .through the same," while contact member 84 is attached directly' tofcontact ring 77. Secured to the shaftflU, "posite the contact rings 76 and-77, isa klike member 85', tothe faeeoflwhichis. ted at a *spacev therefrom, fa ,contactring .tafct lmembers 8.8 and 89,

material holds said Contact ring'f 86,zin`su latedf'from the di'sk85. Secured to the face ofsaid contact ring 86, are two spring con shown also in'face view of'. Fig.v 18,- said` contact members 88 4 and, 89,'.being--adapted to intermittently 4con'- and*itliely 'contact ring l end, is'connectedthrough the parts 11,14,

' 1-5 and 16, t'o the hub of the vInen'lbersv 88 and 89 revolvev with l rotor .4,

rotor llarcontact l overliev the hub portions of 'gages from the d g l i cimuxnferentiallythereoh between which gear ring, or rim, 95, having formed on its inner face a series of eccentrically disposed runways, similar to the run-ways 93, shown' in Fig. 5. Between said gear ring 95, and the'mem'bers A'25 and 26, are two series of balls 96, and 96, as clearly shown in Fig. 1, the larger ones 96, being locking balls and operate in exactly the same manner as do. the llocking balls9-1, shown in Fig. 5. VThe series of balls 96l forma bearing between the vparts 26 and 95.

Mounted in a suitable bearing block 97, is a short shaft 98, to the outer end of which, as at 99, maybe attached any means for applyi'ng` power. Mounted on said shaft near its o posit'e ends are two gears 100 and 101, whic meshrespective1y, with the gears 91 and95. Said gears` 100 and 101 are formed with hollow inner adjacent faces, and are provided therein, .keyed to saidshaft 98, asv at 102f-102 with disk-like members '10S-:193.13m .with afplurality-`4 of s' pacing sleeveslOatlOa,` hichare', attached rings 4105+105. An E ed aroundA their outer edges 4 ed: tobe engaged by ta pawl, or dog, as 107, 'one of whichis'fypivotally the disks 103-L-f1'03', as .between the disk 103 1 and its ring 105. j 'Thefinner ends of'said ,107, ride uponthe vI'nojecting pawls, or dogs,

secured to each of opposite vend portions of the bearingblock'V 97, which opposite ends are formed ,into l,flang'elike extensions, as 97-'97, which the disks ID3- 103, as clearly' shown inFig. 1. Said flange-like extensions 975-97?, of said bear- 'ing block 97, are cut away,]asat 97h, for a portion of the circumference thereowhere- Aby when the inner yend off-thep'awh or disk, 107, reaches. this "cl'i't`-.av v{a-y portionl 97,.- i-t is free to swing and' automaticall jgdisenf riving; tooth, or ug, 106,

r-orr thevi'nner face. vof the gear 100. These 'cut-out' ljportions1197", at theopposite ends ofthebearing blocki97, are atidi'erentposil. tions .eiroumfe'rentiall gtaiting kshaft 98,1' iszturned, (n'e of the' gears,

so that when the shaft A through i Byfthe-t eine pa 60er-107, cutaway portion-97h,-

free the driving tooth, or lug, 106, on the gearv"100, and bythis time the correspond- In Fig. 21, it is Fig. 22, it is a still furtherstep back Insubstaningv pawl,"or dog,107, on thev diskV 103, in

. gear 101, engages a corresponding driving tooth, or lug', 106, in said gear 101, whereby the continual movement of shaft 98, in the same direction drives gear 101 a partial i rotation, vand through its connections with gear ring,- or rim, 95, and the part 25, drives the rotor 3 a partial rotation. tinual turning of the starting shaft 98, alternately drives` gear 91 and gear ring 95, eachl a -partial rotation, and through their connections alternately turns the rotors 3 and 4 partial rotations.

The operation of my invention may be briey described as follows:

Referringto Figs. 19, 20, 21 and 22, I have. illustrated in a' general diagrammatic manner one cycle of the operations; that is, in one quarter, or section, of the rotor casing, as the rotor vanes are alternately and intermittently moved, the explosive mixture is being taken in; in the first' preceding quarter, a charge of explosive mixture is being compressed; in the second preceding quarter the explosion of another charge is taking place, and in the last preceding quar noticedthat this order of functionsv steps backwardly substantially one quarter' each,

time; that is, the intake isone step back, in Fig.v20, of its position `as shown inF ig. 1 9.

a further step back, and inA the next action it would be again tially in the position of the intake, Fig, 19.

It will be understood, of course, that figures do not always represent the'exact.. o'-

sitions at which the Junctions'the inta e,

description of the compression, `the explosion and the exhaust take place each time, for the rotors are revolving and therecan be and is a general shifting, it being understood that' the intake may take place at any point aroundA the arc of the circle, as may alsor'the compression, the explosion and the exhaust@ Referring now t0 Fig. l' ,we-will- "assume that a charge of gasA has" just been compressed between rotor vanes''. and 4, and that an explosion isV taking place Rotor vane 3, is locked against` backward movement while rotor wardly, ahead of it through the chamber outlet v5. The rotor vane 4", will compress a vcharge of gas ahead of it as Yit approaches rotor vane 3?, and moves into the position shown in dotted lines, and atthe same time it will draw in a' charge throughl chamber-7, in its rear. As the rotor vanexf4". approaches the rotor vane 3'* above, ashown in dotted-lines, compressing the char therebetween, aniother explosion takes p ace ywhich:drives the rotor 3 forwardly, its vane, havingl re#l Thus condrawings, that van-e 4, will be driven forand `will exhaust the burnt gases ceived the impulse from the explosion, is driven forwardly. and forces out the burnt gases ahead of it, while its rotor va ne 3? is compressing a charge in front of it, and is drawing in a fresh charge in its rear. Thus the operation is repeated continuously, the position of the explosion being one step back each time, as is illustrated in the diagrammatic Figs. 19 to 22.

It will 'be understood, of course, from the detailed description, that the contact members of the'sparking mechanism travel with the rotors, and that they can be so adjusted that as the rotor vanes approach each other, the spark takes place therebetween, nomatter at what position in the rotor casing they may be, It will also be understood that the passageways from the general supply chamber 60, through the annular chambers 32, 33,' 34 and 35, and through the . dierent chambers 5, 6, 7 v and 8, inl the rotor extensionc, to the rotor casing, are automatically closed by the valves64, 65, 66 and 67, excepting when there is an intake `suction applied through any one of these passageways to the general supply chamber 62, sufficient to open its particular valve.v 'It will also be understood that these passageways are also automatically and successively opened through the exhaust valve mechanism, it having been shown how the force of an explosion in one of the chambers, as through 35a, Fig; 12, moves piston 43" and opens valve 43 for exliaustfthrough 32a into45, and out through 46,-'5thi'1seach explosion opens the exhaust valve to a preceding chamber in which an explosion has. taken place, whereby ,the burnt gasesffare forced out of the diierent chambersI in successive order.

-Thus'l-it will be seen from the foregoing one practical embodiment of taken in Aconnection with vthe I have produced an improved rotary internal'combustion engine, in which the power is applied direct to the driving shaft', without theuse of cranks. I have also roduced in such an engine a constructionin which the intake of the explosive mixture can take' place at any point around the are of .the circle, andI also a construction in which .the exhaust can be made at any point around the arc of the circle.l

Attention is also called to ;-the fact that in-v asmu'oh as spark4 plugs '7 Gand-,72 are, connected to operate together, asare also spark 1 plugs 71 and f? 3, two sparks take place at the same time between the opposite ends of the rotor vanes,so that ifthereis any explosive mixture left betweenany two of the vanes asA they approach eachother,y it willfbe yexploded at the-same time-the' main charge is-exploded between the twoopposite' rotorvanes.r For example, referring' to Fig. 7, assuming that a spark is yduefbetween rotor vanes which will drive v rotor vane 4 my invention,

las

3? and forwardlyfio the sides of said casing,

- shaft therethrough, pistons in crossed-rremiv ' pistons having longitudinali y' into the dotted line position, there will also lbe a spark for discharging any explosive mixture which mayhave remained between rotor vanes 3b and 4b, which explosion, 1f

any, would coperate with the main explosion taking place betweenl rotor vanes 3a and fla. The main explosion would drive the rotor vane 4a forwardly, while the'other'explosion, if any, would drive itsfopposite end,-

rotor vane 4th, forwardly..

Attention gis also calledto theflact that the the screws, or bolts, -60."

y I am aware that many changes. lcan he4 made in my invention as' hereshowinVv and described for purposes of illustration,"with out departing from the-spirit thereof, andv I,

do not, therefore, limitJ the invention to the embodiment here shown, fexceptasjfgmay be the hereto appendedclaims.

limited by I claim:

1. In a rotary engine, a-pistoi'i .easing,pis tons arranged in crossed relationship therein and adapted to move forwardlystep by step alternately', means for. vholding said pistons against backward movemenh pistons'having hub portions extending from onev of'said hub portions having combinationv inletl and exl .haust passageways extending longitudinally position outside of said casing, -andgcontrot- .ling mechanism outside of saidgjeasing forcontrolling the inlet and exhaust"actioii-pfportions formed to have therethrough from within the-.casing to a said engine, substantially as described.; v

I2. In aI rotary engine, a -pistoncasing, a

lationship in said axis of said shaft, portions in interitting'relationship' around said shaft, the hub portionl ofl casing vto vturn "about "the passageways therethrough 1 to; ltliespaces be'- tween said pistons, means .for automatically holding said pistons against v :backward movement, said means beingoutsideof said casing, valve mechanism controllingythe passageways through the hub portion referred to, and ignition mechanism including rotating Contact members, substantially as described. Y y

3. In a rotary gas enUine,-,in combination, a piston casing, a shaft therethrough,two pairs of pistons mounted thereonin'crossed relationship with each other, said pistons having hub portions in interiitting relationship around said shaft whereby said; pistons follow each other step by step, phehub portion of one pair of pistons proJectingrom one side of said casing and the hub portion of the other pair of pistons projecting from frias' is fuseau@ of .the

said

the opposite side of said casing, one of said hub portions having therethrough, longitudinally thereof, a plurality of passageways terminating at their inner-ends in said casing-between the pistons,and valve controlling'niechanism forthe outer ends of said passageways outside of said casing.

4. In arotary gas engine, 1n combination, a piston casing, a shaft therethrough, two

lpairs of pistons mounted thereon in crossed relationship with each other, one of said pistons havinga hub portion extending through-.the sideof said casingand having longitudinally extending ports therethrough terminating at their inner ends within the casing, 'between theA pistons, and at their outer ends outside of said casing, valve vmechanism around said hub portion outside of 'said casing for controlling inlet and exhaust action through said passageways, and

'ignition'.means therefor, substantially as described. y

5... 'In ajrotary internal combustion engine, a casing,t wo pairs of pistons therein in `crossed'relationship, said pistons having hub portions, oiiejof which extends through the side of the casing ,and is provided with `a plurality ofzseparate, longitudinally extending passageways terminating at their inner ends withinsaid casing, between the pistonsyand at their outer ends outside of said casing, and valve mechanism for controlling said passageways as inlet and exhaust passageways, as said pistons are revolved, substantially as described.

6. In a rotary internal combustion engine, a casing, two pairs of pistons in crossed relationship therein, sai pistons having hub overlapping interfitting. relationship with each other, whereby pistons follow each other, step by step,

e* trolling said passageways as inlet and exhaust passageways.

In a rotary internal combustion engine, a casing having a shaft therethrough, twopairs of pistons in crossed relationship within said casing said pistons having hub portions formed to have overlapping -and interfitting relationship with each other, whereby said pistons follow each other step by step, means for holding said pistons automatically against any backward movement, the hub portion of one pair of said pistons having a plurality of separate passageways longitudinally therethrough from outside of said casing to a point within said casingI between said pistons, valve mechanisms-around the extended hub portion for controlling'said passageways outside of said casing, for inlet and exhaust functions, and

oiieof'the hub portions having a plurality of separate passageways extending longitudi- -fnall'y therethrough from outside of said fsaidfuv ding means including revolving Contact ignition for said engine, substantially as members described.

8. A rotary gas engine of the character referred to comprising in lindrical casing, a pair of rotors mounted therein to turn about a common axis concentric with said casing, one of said rotors having al hub-like extension provided with a plurality of chambers therethrough and opening into said casing, and the other of said rotors being rotatably mounted in intei-fitting relationship at its hub-portion with said first rotor, whereby the rotor vanes are in crossed relationship within said casing, a driving member having operating connections with said rotors, means operating to prevent any backward rotative movement of said rotors, means for connecting a supply of explosive mixture through the chambers of said rotor hub extension, with valves for controlling the same, an exhaust valve mechanism connected with said chambers through said hub extension, whereby said chambers act both as exhaust passageways and intake p'assageways to said rotor casing, and a sparking mechanism controlled by said rotors for igniting the explosive mixture, substantially as described.

S). A rotary gas engine comprising in combination a cylindrical casing, a pair of crossed rotors rotatably mounted therein to turn about a common axis, means for locking said rotors against backward rotative Copies of combination a cythis patent may be obtained for iive cents each, by addressing the movement, means providingA inlet passageways into said casing through the hub portions of said rotors, means for connecting a supply of explosive mixture to said passageways, whereby the Same is drawn into said casing by the -rotative movement of said rotors, valve mechanism for controlling the supply of said explosive mixture to said passageways, means for igniting said explosive mixture, said means being controlled by said rotors, and an exhaust valve mechanism connected with said casing, substantially as described.

10. A rotary gas engine comprising in combination a. easing, a pair of rotors therein to turn about a common axis, one of said rotorsv having a hub portionextending through the side of said casing with a plurality of separate, longitudinally extending passageways therethrough from a point outside oi said casing to a point inside of said casing, the other of said rotors being rotatable in interfitted relationship at its hub portion With the first rotor, whereby said rotors are in crossed relationship in the casing, and means outside the casing for automatically locking said rotors against backward movement,

Signed at Portland, Multnomah county, Oregon, this 15th day of December, 1916.

JAMES WILLIAM GREEN.

In presence 0f- I. M.V GRIFFIN, J. C. STRENG.

Commissioner of Patents,

Washington, D. C.

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