US907023A

US907023A - Rotary engine.

Info

Publication number: US907023A
Application number: US36298007A
Authority: US
Inventors: John H Fitch
Original assignee: Individual
Current assignee: Individual
Priority date: 1907-03-18
Filing date: 1907-03-18
Publication date: 1908-12-15
Anticipated expiration: 1925-12-15

Description

J. H. FITCH.

ROTARY ENGINE. A

Arrmoulox rILnn un. 1e, 1907.

907,023. Patented Dec. 15,1908

3 SHEETS--SHEET l,

J. H. FITCH.

ROTARY ENGINE.

Patented Dec. 15, 1908 APPLICATION FILEDV'MAR. 1B, 1907. 907,023. y

s SHBBTS-SHEBT 2,

m N o ,f o f/ o l- N l o o o W o I o N t 1 ,n o "Y Q x o o 4N N i l N Witnesses J. H. FITCH.

ROTARY ENGINE.

APPLICATION FILED un. 1s, 1907.

907,023. Patented Dee. 15, 1908.

3 SHEETS-SHEET 3.

Wimesses JOH H. FITCH, F LUDINGTON, MICHIGAN.

ROTARY ENG-INE.

Specification of Letters Patent.

Patented D ec. 15, 1908.

Application tiled March 18, 1907. Serial No. 362,980.

To all whom it may concern:

Beit known that I, JOHN H. FITCH, a citizen oi the United States, residing at the city of Ludington, county of Mason, `State of Michigan, have invented certain new and useful Improvements in Rotary Engines, of

` which the following is a specification.

This invention relates to improvements in rotary engines.

My improved rotary engine is particularly designed by me as an explosionengine, but certain features thereof may be embodied in steam engines.

The main objects of this invention are, f

iirst, to provide an improved rotary engine which 1s very effective in the utilization of the power units. Second, to provide in a rotary engine of the explosion type an 1mproved chfrging' and valve-operating lmechanism. T i ird, to provide in a rotary engine of the explosion type ali improved sparking mechanism.

Further objects, and objects relating to details ofconstruction, 'will deiinitel appear from the detailed description to fol ow.

I accomplish the `objectsoi my invention by the devices and means'described in the Vfollowing specification.

Theinvention is clearly deiined and pointed out in the claims.

' A structure embed ing the features of my invention is clearly iliustrated in the accomplanying drawingk, forming a part of this specication, in Whic Figure 1 is a' side elevation-of a structure embodying the features of my. invention.

Fig. 2 is a central vertical section taken on a line corresponding -to line 2--2 of Fig. 3, certain parts being shown in full lines. Fig. Sis a vertical transverse section taken on a line corresponding to line 3-3 of Fig. 1. Fig. 4 is an enlargedvertical section taken on a .line corresponding to line 4- 4 of Fig. 3,

showing ydetails of thesparking mechanism. In the drawing, the sectional views are taken looking in 4the direction of the little arrows at the ends of the section lines, and similar numerals of reference refe'r to similar i i he'ad at the same, ir-substantially the same,

lrate of movement, the-crank pin 17 being at' this time at the inner end of the slot of one,

parts throughout the several views.

Referringto the drawing, I provide a suitable base as 1 on which the cylinder is mounted, the cylinder being made up of sections 2 and 3, divided on a central line, the section 2 vbeing preferably formed integral 'with the vbase and the section 3 being sultably secured thereto; The main cylinder is adapted to ref.

ceive the disklike(piston 5, which is provided with a piston khea =6. The outer portion of the cylinder chamber is preferably cylindrical in cross section; see Fig. 3. The cylinder is preferably provided with suitable water chambers. The piston 5 is mounted upon a shaft 4 which is arranged in suitable bearings arranged centrally ofthe main cylinder.

At each side of the Amain cylinder I arrange a compression-chamber 7. The plun-V ger cylinders open at one end into these vcompression chambers and at the other into the'main cylinder, the plunger cylinders ybeing of the same diameter as the outer portion ofthe main cylinder and bein arranged tangentially thereto, so that the p ungers 11 may pass into the main cylinder, and, when in their inner position, close thel same or form a partition across the same, as clearly appears in the drawing. The lungers 11 areocperated through the cranks afts 8. ro-

vide with arms 9 which are connecte to the plungers 11 by suitablepitmen, as 10. The crank shafts 8 are-provided with suitable arms 13 .on their outer ends, which arms are connected by the. itmen 14 to a pair of ivoted levers 15. 'liixese leversare pivote on the main cylinder at 18', and are rovided with longitudinal cam slots throug which the crank pin 17, carried by the crank disk 16, is. arranged. This crank disk is mounted on the shaft 4.v of the engine. It is obvious vthat as theshaft 4 revolves, the crank pin 17 .actuates the levers 15, moving from end to end of the slots therein. These levers are oppositely-arranged, so that the movement o the -two plungersrisproperly timed. On account of the cam slots in :the levers,-the central portion of eachslot being preferably curved, Ithe curvature of the slots :correspondin to that of an arc of the circle described y the crank pin 17,-the plungers.

of the levers 'and at the outer end of the slot of lthe other. This same fmovement provides for the quickretraction of theplungers .inyadvance of-the'piston head.

They explosive :mixture .is ,delivered ,te the.

compression chambers 7 from suitable source, as through the pipes 22, the check valves 23 being provided forthese pipes. On the return stroke of the plunger, the explosive mixture is compressed and forced into the charge or delivery chambers 19, which are mounted upon the cylinder and connected thereto by suitable passages as 19. The delivery chambers are connected to the compression chambers by suitable pipes as 20, the pipes 20 being provided with check valves as 21. The c onnections and valves are 'indicated in conventional form. The assages 19 are controlled by the valves 24.

n the stems ofthe valves are segments with which the segments 26 on the valveactuating levers 28 are arranged to mesh. These levers 28 are ivotally mounted on the pivots 27. On t e crank disk 16 are trips 31, adapted to engage the levers28as the piston revolves, thereby opening the valves to admit the charge. These parts are so arranged that the valves are opened immediately after the piston head 6 passes the inlet passa es 19. The plungers 11, passing intothe cy inder behind the piston, properly conine the charge. The valve-actuating levers are also adapted to serve as part of the igniter mechanism, the same being arranged to engage the contact members 35, and thus complete' the circuit, the crank disks being provided with a suitable contact member 34 adapted to engage the fixed contact members 33 mounted lon the engine casing. this invention, they are not hereillustrated. The valve-actuating levers 28 are returned to their initial position, which also closes the valves, 'by means of the springs 30. Suitable stops, as 29, are provided therefor.`

A'pair of exhausty ports 25 is provided.-

These exhaust ports are located midway between the inlet ports 19' and are preferably of relatively lar e diameter, so that the engine exhausts always open, there are noy -compressions to retard the piston.

By my improved rotary engine, I am enabled t0 attain both' speed and power with an economical use of fuel.' The chargingand valve-operating mechanism is very effective and also by this arrangement, I secure the proper timing of the sparking.

I have illustrated the Vmechanism for obtaining the movement of the plungers 11, which I find simple and effective, but I am aware that it may be very greatly varied or other movements substituted Without "departing from my invention.

I have illustrated and described my improyed rotary engine in detail in the form preferred by me on account 'of its structural simplicity and economy; I am' aware, however, that it is capable of considerable variation in structural details withoutde- As the electrodes form no part of reely.- As both ports arel ally as illustrated as well as broadly.

Having thus described my invention, what I claim as new and desire to s'cure'by LettersPatent is: .Q Y

1. The combination with a main cylinder, the outer portion of which is cylindrical in cross section, of a shaft; a disk-like piston mounted thereon; a cylindrical head 'for said piston; a air of delivery chambers; a pair of oppositelyyarrangedl delivery passages therefor; a pair of compression cham' bers; connecting pipes for saidv compression chambers to said delivery chambers; checkl valves therefor; supply pipes for said compression chambers; check valves for said supply pipes; a (pair of 4plunger cylinders opening into 'sai main cylinder and compression chambers, said plunger cylinders 'eing of the same diameters as the said cylindrical portion of the main cylinder and arranged tangentially thereto; a pair of .plungers ada ted to pass intosaid main cylinder to c ose the same when in their inner osition; a pair ofcrank shafts arrangedp in saidcompression',chambers; crank arms. thereon; itmen connecting said crank arms to said p ungers; a .pair of crank arms on the outer ends of said crank shaft; a crank disk on said piston shaft; a air of oppositely-arranged pivoted` levers aving cam slots therein; a crank pin on said crank disk arranged in said slots i'n said levers; pitmen connecting said levers to said arms for said delivery passages; segments on the stems of said valves; a pair of pivoted valveactuating levers having segments arran ed to mesh with said segments on said va ve stems; springs for returning said levers to .their initial position, whereby said valves are held normally closed;'tri s on said crank disk adapted tox actuate sai valve levers; a

contact member carried by said crank disk;"110 'a fixed contact member adapted to coact therewith; and contact members arranged to be engaged by said actuating-levers when in their actuated position, coacting for the purpose specific 2. The combination with a main cylinder, the outer portion of which is cylindrical ir cross section, of a shaft; a disk-like piston mounted thereon; a cylindrical head for said pistons; a pair of delivery chambers; 120 `a pair of oppositely-arranged delivery passages therefor; a pair of compression chambers; connecting pipes for said compression vchambers to said delivery chambers; check valves therefor; supply pipes for said com- 125 pression chambers; checkv valves for said supply pipes; a pair of plunger cylinders opening into said main cylinder and com-` ression chambers, said plunger cylinder be'-` ing of thesame diameters as the said cy- 13o on the outer ends of. said crank shafts; valves lindrical-portion of the main cylinder and arranged tangentially thereto; a pair of plungers adapted to pass into said main cylinder to close the same When in their inner. position; a pair of .crank shafts arranged in`said compression chambers; crank' lto mesh with said segments on said valve stems; springs Jfor returning said levers to 'their initial position; whereby said'valves are held normally closed; and trips on'said crank disk adapted to actuate said valve levers, coacting for the purpose specified.

3. The combination With a main cylinder;

the outer portion of Which is cylindrical in.

cross section, of a shaft a disk-like piston initia mounted thereon; a cylindrical head for said pistona pair of delivery chambers; a pair of oppositely-arranged delivery passages therefor; a pair of com ression chambers; connecting pipes for sai compression chambersI to said delivery chambers; check valves therefor; supply pipes for said compression chambers; check valves for said supply pipes; a pair of plunger cylinders opening into said main cylinder and compression chambers, said -plunger cylinders being oi'. the vsame diameters as the said cylindrical portion of the main cylinder and arranged tangentially thereto;'a pair lof plungers adapted to pass into said main cylinder. to close the same when in their inner position; a pair of crank shafts arranged in said compression chambers.; crank arms thereon; itmen connecting said crank arms to said p ungers; a air of crank'arms on the outer ends of sai crank shaft; a crank disk on said piston shaft; a pair oi oppositely-a'rranged pivoted levers aving cam slots therein; a crank pin n said 'crank disk arranged in said slots in said levers; pitmen connecting said levers to said arms on the o'uter ends 'of said crank shafts;

valves for said delivery passages; a pair of pivoted valve actuating levers therefor; sprin s for returnin said levers to their 1position, Where y said valves are held norma y closed; .trips on said crank disk adapted to actuate said valve levers; a contact member carried by said crank disk; a iiXed contact member adapted' to coac-t there- With; and contact members arranged to be engaged by said actuating levers when in. theiriactuated position coacting for the purpose specified.-

4. The combination with a main cylinder; the outer portion of, which is cylindrical in cross section, of a shaft; a disk-like piston mounted thereon; a cylindrical headfor said piston; a` pair of delivery chambers; a pair of oppositely-arranged delivery passages therefor; a pair of compression chambers; connect- .ing pipes for said compression chambersto said delivery chambers; check lvalves therefor; supply pipes for said compression chambers; check valves for said supply pipes; a

pair of plunger cylinders opening into said ma'in cylinder and compression chambers, said plunger cylinders being ofthe same diameters as the said cylindrical portion of` the main cylinder and arranged tangentially thereto; a pair of plungers adapted to pass into said main cylinder to close the same When in their inner position; a pair of crank shafts arranged in said compression chambers crank arms thereon; itmen connecting said crank arms to said p ungers; a pair of crank arms on the outer ends of said crank shaft; a crank disk on said piston shaft; a pair of oppositely-arrange'd pivoted levers having cam. slots therein; a crank pin on said crank disk arranged in said slotsin said levers; pitmen connecting said levers to said arms on the outer ends of said crank shafts; valves for said delivery passages; a pair of pivoted valve actuating levers therefor; sprin s for returning said levers to their initia osition; whereby said valves are held norma y closed; and trips on said crank disk adapted to actuate said valve levers, coacting for thepurpose speciiied.

5. The combination With a main cylinder, the outer portion of which is cylindrical in cross section, of a shaft; a disk-like piston mounted thereon; a cylindrical head for said piston; a pair of delivery chambers; a pair of oppositely-arranged delivery passages therefor; a pair of compression chambers; connecting pipes for said compression chambers to said delivery chambers; check valves therefor;'supply pipes 4for said compression chambers; check valves for said supply pipes;'a` i pair'of plunger cylin'dersopening into said main -cylinder and compression chambers,

Vsaid plunger cylinders being -of the same Y diameters as the saidl cylindrical portion -of the main cylinder and arranged tangentially" crank arms on the outer ends of sai crank vshaft;,a crank disk on said'piston shaft; a pair of oppositely-arranged pivoted levers air of4 aving cam slots therein; a crank pin 'on'saidcrank disk arranged inl'said slots inf said levers; pitmen connecting said levers. to` said: armson the outerends of said .crank-shatts;

les?

ports; a pair of compression chambers connected to said delivery chambers; a pair of plunger cylinders opening into said main cylinder and compression chambers, said plunger cylinders being of the same diameters as lthe said outer annular portion of the main cylinder and arranged tangentially thereto; a pair of plungers adapted to pass into said main cylinder to close the same when in their inner position; a pair of crank shafts arrange'd in said compression chambers; pitmen connecting said crank shafts to said plungers a crank disk on said piston shaft; a pair of oppositely-arranged pivoted levers aving cam slots therein; a crank pin on said crank disk arranged in said slots i'n said levers; pitmen connecting said -levers to said crank shafts valves for said inlet port; segments on the stems of said valves; a pair of pivoted valve-actuating levers having segments thereon arranged to mesh With said segments on said valve stems springs for returning said levers to their initial position, whereby said valves are held normally closed;

trips on said crank disk adaptedto actuate.

said valve levers; a contact member carriedl by said'crank disk; a iXed contact member adapted to coact therewith; and contact members arranged to be engaged by said valve-actuating levers when in their actuated position, coacting for the purpose specifie 7. The combination with a main cylinder, having an outer annular portion, of a shaft; a disk-like piston having a head, mounted on said shaft; a pair of delivery chambers connected to said cylinder by suitable inlet ports ;,a pair of compression chambers connected to said delivery chambers; a pair of plunger cylindersopening into said main cylinder and compression chambers, said plunger cylinders being of the same diameters as the said outer annular. portion of the main cylinder and arranged tangentially thereto; a pair of plungers adapted to pass into said main cylinder to close the same when in their inner position; a pair' of crank shafts arranged in said compression chambers; pitmen connecting said crank shafts to said plungei's a crank disk on said piston shaft; a pair of oppositely-arranged pivoted levers having cam slots therein; a crank pin on said crank kdisk arranged in said slots in said levers; pitmen connecting said levers to said vcrank shafts; valves for said inlet port; segmentsl on the ste'ms of said valves; a pair of pivoted valve-actuating levers having segments thereon arranged to mesh with said having an outer annular portion, of a shaft a v disk-like piston having a head, mounted on vsaid shaft; a air of deliverychambers connected to said cylinder by suitable inlet ports; a pair of compression chambers connected to said delivery chambers; a pair of plunger cylinders opening into said cylinder and compression chambers, said plunger cylinders being of the same diameters as the said outer annular ortion of the main cylinder and arrangedp tangentially thereto; a pair of lungers ,adapted to pass into said main cy inder to close the same when in their inner position; a pair of crank shafts arranged invsaid compression chambers; pitmen connecting said crank shafts to said plungers a crank disk on said piston shaft; a pair of oppositely-arlanged pivoted levers having cam slots therein; a crank pin on said crank disk arranged in said slots in said levers; pitmen connecting said levers to said crank shafts; valves for said inlet port; a pair of pivoted valve-actuating levers therefor s rings for returning said levers to their initia lposition whereby said valves are held norma yl closed; trips on saidcrank disk adapted to actuate said valve levers; a contact member carried by said crank disk; a iixed contact Vmember adapted to coact therewith; 'and contact members arran ed to be' engaged by-said valve-actuating evers when in their 'actuated position, coacting-for the purpose specified.

9. The combination with a main cylinder, havin an annular outer portion, of a shaft;a disk-li re piston having a head, mounted on said shaft; a air of delivery chambers connected to said. cylinder by suitable inlet ports; a pair of compression chambers connected to said delivery chambers; a pair of. plunger cylinders opening intoA said main cylmder and compression chambers, said plunger cylinders being of the same diameters as the said outer annular portion of themain cylinder and arranged tangentially thereto; a pair ofi lungers adapted to pass into said main cy 'nder to close the same When in their inner' position; a pair of crank shafts arranged in said compression chambers; pitmen connecting said crank shafts to said plungers; a crank disk on said piston shaft; a pair-of` oppositely-arranged pivoted levers having cam slots therein; a crank pin on said crank disk arranged in said slots in said levers; pitmen connecting said levers to said of pivoted valve ractuatin levers therefor;

sprmgs for returning.; vsai levers to their.

. adapted to initial osition, whereby said valves are held norma ly closed; and trips on said crank disk actuate said valve levers, coacting for the purpose specified.

4 10. The combination with a main cylinder7 having ari-outer annular portion, of a shaft; a' disk-like piston having a head, mounted on said shaft; a pair of delivery chambers connected to said cylinder by suitable inlet ports; a pair of`compressionchambers connected to said delivery chambers;

`a pair of plunger cylinders opening into said main cylinder and` compression'chambers, said plunger cylinders being of the same diameters as'the said outer annular portion of the main cylinder 'and' arranged tangentially llevers having cam slots theretowz-a pair of into said main cy When in their inner position; a pair of crank shafts arranged "in said compression chainbers; pitmen connecting'said `crank shafts to said plungers'; a crank disk on said piston shaft; a pair of oppositely-arranged pivoted therein; a crank pin on. said crank disk arranged in said slots in said levers; pitmen connecting said levers to said crank shafts; and valves for said. inlet port7 coacting for the purpose specified.

1 1. The combination with a main cylinder, having an outer annular portion adapted to receive the piston head,- of a shaft; a disklike piston mountedtliereon; a head for said plungers adapted to pass i piston; a pair of delivery chambers; a pair of oppositely-arranged delivery passages therefor; a pair of compression chambers; connecting pipes for said compression chambers to said delivery chambers; check valves therefor; supply pipes for said compression chamers; check valves for said supply pipes a pair of plunger cylinders opening into said main cylinder and lcompression chambers, said plunger cylinders being of the same diameters as the said outer annular portion of the main cylinder and arranged tangentially thereto; a pair of plungers adapted to pass intosaid main cylinder to close thesauie when in their inner position; driving connections for said shaft to said plungers; valves for said delivery passages; a pair of actuating levers for said valves; and trips carried by *said shaft adapted to actuate said valve levers, coasting for the purpose specified.

12. The combination with a main cylinder, having an outer annuiar portion adapted to receive the piston head, cf a shaft; a disklike piston mounted thereon; a head for said piston; a pairof delivery chambers; a pair ofA oppositely-arranged delivery passages Athere-v -for a pair of compression chambers; connect- 111g pipes for said compression chambers Ato said delivery chambers; check valves therefor; supply pipes for said compression chambers; check valves for said supply pipes; a pair of plunger cylinders opening into said main' cylinder and `@engagingsion chambers,

nder to close the saine I I said plunger cylinders being of the same diameters as the said outer annular portion of l tne main cylinder and arrapged tangentially 5 thereto; a pair of lungers adapted to pass ,i into said main c; linder. to close the same l, when in their inner position; and driving con- ,l nections for said shaft to said plungers, coacting for t-he purpose specified.

13. The conibination'witli a main cylinder having an outer annular portion adapted to receive the piston head, of a shaft; a disklike piston mounted thereon; a head for said piston; a delivery chamber connected to said i cylinder by a suitable port or delivery pasi sage; a compression chamber; a connecting I pipe for said compression chamber to said i delivery chamber; a check valve'therefor; a supply pipe for said compression chamber; a check valve for said supply pipe; a plunger cylinder opening into said main cylinder and .compression chamber, said plunger cylinder being of the said diameterv as the said outer portion of the main cylinder and arranged g tangentially thereto; a plunger adapted to pass into said main cy inder to close the same When in its inner position; driving connections `for said shaft to said plunger; a l valve for said delivery passage; an actuatin l lever for said valve; and a trip carried by sai shaft adapted to actuate said valve lever.

14. The combination with a main cylinder; having an outer annular portion adaptedito I receive the piston head, ofa shaft; a diskl like piston mounted thereon; a head for said piston; a delivery chamber connected to said cylinder by a suitable port or delivery passage; a compression chamber; a connectin 1r pipe for said compression chamber to said delivery chamber; a check valve therefor; a supply pipe for said compression chamber; a check valve for said supply pipe; a plunger cylinder opening into said main cylinder and compression chamber, said plunger cylinder being of the same diameter as the said outer portion of the main cylinder and arranged tangentially thereto; a plunger adapted to pass into said cylinder to close the saine Vwhen in its inner position; and driving connections for said shaft to said plunger.

15. The combination With a main cylinder7 having an outer annular portion adapted to receive the piston head; of a shaft; a disklike piston having a head; mounted on said shaft; a delivery chamber connected to said cylinder by a suitable inlet port; a compression chamber connected to said delivery chamber; a plunger cylinder opening into said main cylinder and compression chamber; said plunger cylinder being of the same diameter as the said cylindrical portion of the main cylinder and arranged tangentially thereto; a plunger adapted to pass into said main cylinder to close the same when iii its 'inner position; a crank shaft arranged in said compression chamber; a pit'man connecting crank disk; a fixed contact member adapted to coact therewith; and a contact member arranged to be engaged by said valve actuating lever when in its actuated position.

16. The combination with a main cylinder, having an outer annular portion adapted to receive the piston head, of a shaft; a disklike piston having a head, mounted on said shaft; a delivery'chamber connected to said cylinder by a suitable inletport a compression chamber connected to said delivery chamber; a plljilmger cylinder opening into said main cy der and compression chamber, said plun er cylinder being of the same diameter as t e cylindrical ortion of the main cylinder and arrange tangentially thereto; a plunger adapted to pass into said main cylinder to close the same when in its inner position; a crank shaft arranged in said compression chamber; a pitman connectin said crank shaft to said plunger; a crank dis on said piston' shaft; a pivoted lever havin a cam slot therein; a crank pin on said cran disk arranged in said slot in said lever; a pit- 4 man connecting said levers to said crank shaft; a valve for said inlet port; an actuatin lever therefor; a spring for returning sai lever to its initial osition, whereby said valve is held normally closed; and a trip on said disk adapted to actuate said valve lever.

17. The combination with a main cylinder, having an outer annular ortion ada te'd to receive the piston head, o avshaft; a sklike piston having a head, mounted on said shaft; a delivery chamber connected to said cylinder by a suitablek inlet` port; a compression chamber connected to said delivery chamber; a lunger cylinderzopening into said main cy inder and compression chamber, sai'dplun er cylinder being of the same diameter as te said cylindrical' portion `oflthe main cylinder and arranged tangentially thereto; a plunger adapted to pass into said main cylinder to closethe same when `in its vinner position; a crank shaft *arranged in said compression chamber; a pitman connecting said crank shaft to said plunger; a crank disk on said iston shaft; a pivoted lever'having a cam s ot therein; a crank pin on said crank disk arranged in said slot in said lever; and al pitman connecting said levers to said crank shaft.

18. The combination with a main cylinder, having an outer annular portion adapted to receive the piston head, of a shaft; a disklike piston having a head, mounted on said shaft; a plunger cylinder opening into said main cyhnder, saidplunger cylinder being of the same diameter as the said cylindrical therein; a crank pin on said crank disk arranged in said slot in said levers; a itman connecting said levers to said crank s raft; a valve for said inlet port; an actuating lever therefor; a spring for returning said lever to vits initial'position, whereby said valve is held normally closed; a trip on said crank disk adapted to actuate sa1d valve lever; a conltact member carried by said crank disk; a

fixed .contact member adapted to coact therewith; and'a contact member arranged to be engaged by said valve-actuating lever when in its actuated position.

19. The combination with a main cylinder, having an outer annular ortion adapted to receive the piston h'ead, o a shaft; a disklike piston having a head; mounted on said shaft;^a plunger c linder opening into said main cylinder, sai plunger cylinder being of the same diameter as the said cylindr1cal portion of the main cylinder and arranged tangentially thereto; a'plunger adapted to pass into said main cy inder' to close the .same when in its inner position; a crank shaft; a itman connecting said crank shaft to said p unger; a crank disk onv said piston shaft; a pivoted `lever having a cam slot therein; a crank pin onsaid crank disk arranged in said slot in said lever; a itman connecting said levers to said crank s aft; a valve for said inlet port; an actuating lever therefor; a spring for returning said lever to its initial position, whereby said valve is held normally closed; and. a trip onl said crank disladapted to actuate said valve lever.

20. The combination with a main cylinder, having. an outer annular portion adapted to `receive the piston head, of a shaft; a disklike piston having a head, mounted on said shaft; a plunger 'cylinder opening into said main. cyhnder, said plunger cylinder being of the same diameter as the said cylindrical vportion of thev main cylinder and arranged tangentially thereto; a lunger ada ted to pass into said main cylin erto close t e same when in its inner position; a crank shaft; a pitman connectin said crank shaft to said plunger; a crank isk on said piston shaft; a pivoted lever having acam slot therein; a crank pin-on said crank disk arranged in said slot in said lever; and a pitman connecting said levers to said crank shaft.

v 21. The'combination with a main cylinder,

of a shaft; a piston mounted on said shaft; a

`pair of delivery chambers connected to said cylinder by suitable oppositely-arranged inlet ports; a pair of compression chambers connected to said delivery chambers; a pair of plunger cylinders opening into said main slots in said levers; pitmen connecting said vlevers to said crank shafts; valves for said delivery ports; a pair of valve-actuating levers therefor; springs for returning said levers to their initial position, `whereby said valves are held normally closed; trips on said 'crank disk'adapted to actuate said valve levers; a'contact member carried by said crank disk; a fixed contact member adapted to coact therewith; and contact members arranged to be engaged by said ac- Atuating levers when in their actuated posi tion, coacting for the purpose specified.

22. The combination with'a main cylinder, of a shaft; a piston mounted on said shaft; a pair of ldelivery 4chambers connected to said lcylinder by suitable oppositely-arranged inlet ports; a pair of compression chambers connected to said delivery chambers; a pair of plunger cylinders opening into said main cylinder and compression chambers; a pair of plungers adapted to pass into said main cylinder to close or form partitions across the same when-in their inner position; a pair of crank shafts arranged in said com ression chambers; pitmen connecting sai crank shafts to said plungers; a crank disk on said piston shaft; a pairvof oppositely-arranged pivoted levers lhaving cam slots therein; a crank pin on said crank disk arranged in said slots in said levers; pitmen connecting said levers to said crank shafts; valves for said delivery ports; a pair of valve-actuating` levers therefor; springs for returning said lcvers to. their initial position, whereby said valves are held normally closed; and trips on said crank disk adapted to actuate said valve levers, coacting for the purpose specified.

23. The combination with a main cylinder, of a shaft; apiston mounted on said shaft; a'pair of delivery chambers connected to said cylinder by suitable oppositelyarranged inlet ports; a pair of compression chambers'connected to said delivery chainbers a pair of plunger cylinders opening into said main cylinder and compression cham bers; a pair of plungers adapted to pass into said main cylinder to close or form partitions across the same when in their inner position;

a pair of crank shafts arranged in said compression chambers; pitmen connecting said crank shafts to said plungers; a crank disk on said piston shaft; a pair of oppositely-arranged pivoted levers having cam slots there-V in ;-a crank disk on said piston shaft; a pair of oppositely-arranged pivoted levers having cam s'lots therein; a crank pin on said crank disk arranged in said 'slots in. said levers; pitmen connecting said levers to said crank shafts; coacting for the purpose specified.4

24. The combination with a main cylinder, of a shaft; a piston mounted on said shaft; a pair of plunger cylinders opening into said main cylinder; a pair of plungers adapted to pass into said main cylinder to close or form partitions across the saine when in their inner position; a pair of crank shafts;

' pitmen connecting said crank shafts to said plungers a crank disk on said piston shaft; a pair of oppositely-arranged pivoted levers aving cam slots therein; a crank pin on said crank disk arranged in said slots in said levers; pitnien connecting said levers to said crank shafts; valves for said delivery ports; a pair of valve-actuatin levers therefor; springs for returning said evers to their initial position, Whereby said valves. are held normally closed; trips on said crank disk adapted to actuate said valve levers; a contact member carried by said crank disk; a fixed contact member adapted to coact therewith; and contact members arranged tov be engaged by said actuating levers when in their actuated position, coacting for the purpose specified.

25. The combination with a inain cylinder, of a shaft; a piston mounted onv said shaft; apair of plunger cylinders opening into said main cylinder ;`a pair of plungers adapted to pass into said main cylinder to close or form partitions across the same when in their inner position; a pair of crank shafts; pitmen connecting said crank shafts to said plungers; a crank disk on said piston shaft; a pair of oppositely-arranged pivoted levers having cam slots therein; a crank pin on said crank disk arranged in said slots in said levers pitmen connecting said levers to said crank shafts; valves for said delivery-ports; a pair of valve-actuatin levers therefor; springs 'for returning saidevers to their initial position, whereby said valves are held normally closed; and trips on said crank disk adapted to actuate said valve levers, coacting for the purpose specified.

26. The combination with a main cylinder, of a shaft; a piston mounted on said shaft; a pair of plunger cylinders opening into saidmain cylinder; a pair of plungers adapted to pass'into said main cylinder to close or form partitions across the same when in their inner position; a pairof crank shafts; pitmen connecting said crank shafts to said plungers a crank disk on, said piston "shaft, a pair of oppositely-arranged plvoted 'levers havin cam slots therein;` a crank pin yon said cran disk arranged 1n said'sl'ots 1nv said levers; and pitmen connecting said le` vers to said crank shafts, coacting for the purpose speciiied.

27. The combination with a main cylinder, the outer portion -of Which is cylindrical in cross section, of a shaft; a disk-like piston mifnnted thereon; a cylindrical head for said piston; a plunger cylinder opening into-said maincylinder, said plungercylinder being of tangentially to said main cylinder; a plunger adapted to pass into said main cylinderv to close or form a partition across the same when in its inner osition; and driving connections for said s iaft to said plunger.

. 29. The-combination with a main cylinder, the outer portion of which is cylindrical in cross section;l a plunger cylinder opening into said main cylinder, said plunger cylinder 'being arranged tangentially to said main cylinder; and a cylindrical dplunger adapted to pass into said main cylin er to close the same vor form a partition across the same When in its inner position. l 30. The combination with a main cylinder, of a plunger cylinder opening into said main cylinder; a compression chamber connected to saidy main cylinder and to the outer end of said plunger cylinder; and a plunger adapted to 'pass into said main cylinder to close or vforni partitions across` the 'saine lWhen in its innerosition and to act on said compression cham er on its out-stroke.

In witness whereof, I have hereunto set my hand and seal in the presence of two Witnesses.-

JOHN H. FITCH. [1.; 5.]

Witnesses: l v

W. L. HAMMOND, B. M. Ronrrare.