US991063A - Convertible two to four cycle gas-engine. - Google Patents

Description

0. P, HOPEWELL. CONVERTIBLE TWO TO FOUR CYCLE GAS ENGINE.

APPLIOATION I'ILED MAY 13, 1904.

991,03, Patented May 2, 1911.

4 SHEETS-SHEET 1.

WITHESSEE i I IvErJ'm I I E'I- lv B H15 RTTEIRNEY 49W 0. P. HOPEWELL. CONVERTIBLE TWO TO FOUR CYCLE GAS ENGINE.

APPLICATION FILED MAY 13, 1904.

Patented May 2,1911.

4 SHEETSSHEET 2.

Fla. 2

WITNEESES im mw C. F. HOPE-WELL. CONVERTIBLE TWO TO FOUR CYCLE GAS ENGINE.

APPLICATION EILEfi MAY 13, 1904.

991,063. Patented May 2; 1 911 SHEETSSHEET 3.

af w/m b -W I (9 g Wwflessrzs INVEHTDK By H' W N Y 0. F. HOPEWELL. CONVERTIBLE TWO T0 FOUR CYCLE GAS ENGIlUEL APPLICATION FILED MAY 13, 1904.

Patented May 231911.

4 SHEETS-SIIEET 4.

I !/lllllllllllfllll/ V W 7 Q'N N R' I T 4% j f W I ans? oonvnmrrstn TWO esLoca To all whom it may concern: 7 X

Be it known that I, CHARLES F. Horn- WELL, of Cambridge, in the county of Middlesexand State of Massachusetts, have invented certain new anduseful Improvements in Convertible Two .to Four Cycle Gas- Engines, of which the following is a specification. p

This invention seeks to combine in a single' hydrocarbon explosion engine the phases of both the two cycle and the four cycle types. It seeks further to make these two sets of phases interchangeable. The phases may be changed either by hand or by automatic means. It is generally understood that a four cycle engine is the more economical in the use of fuel than the two cycle engine, while the two cycle in turn is capable of developing greater power weight for weight than the four cycle type. Mymvention seeks ,to combine both these. advantages in one' engine. The alteration of the phases fromthe two cycle sequence to the four cycle sequence may be accomplished by manual means such as the throw of a lever by hand, or it may be accomplished automatically by a governor which" acts when the-engine slows down due to the imposition of a greater load uponit. In power station for illustration, when overloaded, the greater load imposed upon the engine causes it to slow down. vThis'automatically converts the four cycle enginejinto a twocycle engine. When running on the" usual load theengine speeds up again and this causes the engine to be automatically switched over 'to-thefour cycle type. Y In: the accompanying part of this specification, in which similar fthe diflierent figures: Figure" 1 is a front elevation with drawlngs forming a letters ofreference refer to similar parts in arts in section; Fig. 2 is a side elevation; ig. 3is a plan view of the governor with connecting" levers omitted; Fig. 4 is a part sectional viewof the; gove'rnor; Fig. 5 is a diagram ofjthe ga's passages and valves, the features of 'actualcon struction being omitted toflavoid confusion:

" The sua ype of four cycle engineis used for illustrating myninvention, there being. the usual puppet: valves, cam shaft, and '-gear.' drive between the main shaft and the cam. shaft. In order to conveniently change'the" speedofi the cam shaft a lanet-.

ary type of gear hasbeen found e ective.

Specification of Letters Patent.

TO FOUR CYCLE GAS-ENGINE.

Patented May 2,1911.

Application filed May 13, 1904. Serial No. 207,746...

By means of this gear the speed of the cam shaft may be altered from the four cycle speed which calls for one revolution of the cam shaft for every two revolutions of the main shaft; to the two cycle speed which calls for arevolution of the cam shaft for each .revolution of the main shaft. At the same time the valves must be switched to accommodate the explosion at every down stroke of the piston. In order to accomplish this. the puppet inlet valve has to be thrown out of action, the exhaust valve has to be closed at an earlier stage ofth'e up stroke of the piston, the sparking arrangements must be speeded for twicea's many ignitions, and separate inlet passages and valves have to'be.

' opened. These changes are secured by-sliding the camshaft, and by op'eningseparate inlet valves. All these functions .I accomplish by the throw of a single lever.

In Fig. 1 is shown thecylinder 1, the crank case2, theinlet pipe 3, the inlet pup pet valve 4, the spark plug 5, the exhaust valve 7 and the exhaust pipe 8. The inlet and exhaust valves; and 7 are both mechanically actuated by the cam shaft 9 having cams 10 and 11 which as they revolve lift the rollers 12 and 13 mounted upon the valve onceduring each revolution of the cam shaft. This commutator causes the spark plug to ignite the mixture at the proper moment.

Upon the cam shaft 9-is mounted the driving member of a water pump 19 which causes the water in the water jacket to circulate. This pump 19 always works at the speed of the cam shaft.

The cam shaft is driven by a gear wheel QO'fiXed to the shaft. This gear wheel 20 meshes with the gear wheel 21 which revolves at two "diiferenbspeedsas compared with the driving shaftof the engine. In the position of parts shown'in the drawings the wheel 21 revolves .once while the driving cur'es the four cycle sequence of phases. By

stems 14 and 15. The cam 16 liftsthe'. roller 17 and closes the pair of contacts. 18

'shaftrevo'lves twice. This rate of speed seshifting the main switching lever 22 the gear wheel 21 runs at the same speed as the driving shaft 23 of the engine.

The engine is adapted as described to be switched from'the twojcycle sequence of phas-esto the four cycle sequence of phases"v and vice versa. The-main switching lever 22 performs this fun'ction. Tins lever is closes the passage through the pipe 34 from the roller 12 and no longer lifts the valveis brought under theroller 13 of the exhaust the piston. This cam 41 opens the exhaustcycle sequence, the valve 26 closes the pasopened and the engine isin condition to employ its two cycle sequence of phases. In this and the crank case where it is compressed by .is double length so that it actuates the cirswitching lever is connected to the valves- 26 and 27 through the link 28 and the arm 29 secured to the stem 30. When" the lever is switched for the purpose of using the four sage from the inlet 3 to the crank case through the pipe 32; and opens a passage from the crank case through the same pipe 32 to the air inlet 35; and the valve 27 the-crank case to the cylinder.

When the switching lever is thrown to the opposite position the valves 26 and 27 are condition, the mixture enters through the inlet pipe 3, and passes through the open valve 26, through the pipe 32, the check valve 31 the piston; then it passes up through the pipe 34, and the' valve 27 into the cylinder. The main-switching lever 22 is also connected to the cam shaft 9 through the pins 36 fijxed to theffree ring 37 mounted in the groove 38 inthe spool 39 fixed to the camshaft. \Vh'en the lever 22 is switched to the right in Fig. 1 it pulls the camshaft to the right substituting a new set of cams under the valve stems. This shaft should be switched at the proper moment to get the best results, and the parts are shown in the switching position. The shoulder 40 on the cam 10 is cut away so that it may pass to the right under the roller 12. While working in the position shown the shoulder passes 'underthe reduced portion 41, of the. roller 12 and at any other position than the one shown the shoulder 40 would abut against the side of the roller 12 preventing the cam shaft from being switched. This shoulder acts as a locking device to prevent the arm 22 from being switched at any time except the particular moment selected. When the cam shaft does switch to the right the cam.10 passes out from beneath stem. The inlet valve is therefore keptclosed for it is useless when the engine is working as a two cycle engine. \Vhen the cam shaft slides to the right, a new cam 41 valve stem 15 which opens the exhaust valve during a portion only of the up stroke of valve while the piston uncovers the port from the'pipe 34 and valve 27. The cam 16 c'uit closer once during each revolution of thecamshaft as during four cycle operation. When the cam shaft slides to the right, the gear wheel 20 slides also on the gear wheel 21 and remains in mesh with it.

' 20 on the cam shaft.

A lever 42 may be used to switch the main lever 22.];This lever. or link 42 may be op V erated by handor by a governor as shown hereafter... The next connection of the main switching lever 22 is to the keys operating the speed changing gears. The formwhich seems particularly effective is the planetary gear shown in Figs. 1, 2 and ,The planetary gear has a driving member a pinion 43 shown in Fig. 4, which meshes with inions 44; shown in Figs. 2 and 4', which in turn mesh with the internal gear 45. When acting as a four cycle engineas shown, this internal gear 45 is held stationary by thekey' 46 in the slot 47. The key 46 is slidably' mounted in the hole 48 in the crank case-to assist in bracing the key to do its work. The driving pinion 43 then causes the pinions 44 to rotate and travel around the i'nside of the gear 45 and carry the sleeve 49. The pinions 44 are mounted on journals 5() which are fixed in the arms 51 of the sleeve 49.

"This sleeve freely rotates upon the shaft 23 in the position shown and has fixed to it" the external gear 2l which drives the gear When the main switching lever switches the engine to the two cycle sequence of phases the external gear 21 must rotate at the same speed of the engine shaft, and this result is secured by locking the sleeve 49 to the shaft 23 and releasing the internal gear 45 which now becomes an idler. The sleeve 49 is locked to the shaft by'the key 52 sliding, into the slot 53. In this position of parts the planetary gear revolves as a unit. with the shaft and the gear 21- drives the camshaft at twice the previous speed.

The key.52 is carried-in a slot 54 and is fixed to the spool 55. This spool has a groove 56, in which is a ring 57 freely mount-ed but carrying pins 58 pivoted in the main switching lever 22 which is thus connected to the key 52 to operateit to lock and unlock the sleeve'from the shaft 23.

In Figs53 and-4' are shown a governor adapted to perform the switching function when the engine changes its speed due to a variation of the 'load. In theoverloaded.

power station before cited, the engine slows I down allowing the spring 59 to pull the gov- .115

ern'or balls 60 in toward the shaft. 'As the balls move toward the shaftthe link 61 pulls the spool 62 in Figs. 3 and 4 to-the right. and the spool carries the ring 64 mounted in the groove 63 with it. This ring 64 has-piv ots 65 mounted in the link 42 and causes the link to throw the mainswitching lever 22 g to the right which switches the cams, valves andgears so tha tthe engine runs with-the two cycle sequence, of phases. "f 1 It is essential that. the switching arm :22 act-.quic-kly so that there will be no chance for keys or cams to get half way and bind. A spring66 is used preferable to cause the arm to switch instantly when the right confour cycle sequence.

canoes ditions exist. Themain lever 22 hasextended slots 67, 68 and 69 for the pivots 58, 36

and the link 28 to Work in thus allowing a considerable. movement of the switching lever without disturbing the valves, cams or gears. The switching arm is allowed topass over the center of the stationary pivot'7-0 before it act-uates the pivots 58, 36 or' the link 28. When once over the center of the.

pivot 70 these pivots and link are thrown so as to switch the gears, valves and cams from one sequence of phases to the other very quickly. This force is supplied by the compressed spring 66 which thus acts in both directions. I I

It I will be noticed that the circulating pump 19 drives water at double the speed whenthe engine works with the two cycle sequence as when the engine works with the This gives an additional cooling effect when the explosions are doubled in comparison to the speed of the engine shaft. Thev camshaft 9 is slidably mounted in the driving member of the circus lating pump by means of the keyway 71.

four cycle set comprises the valves 4 and '7. The two cycle set includes the puppet valve 7 with the cylinder valve 72, the inlet valves 31 and 26, and the transfer valve 27. These valves of course may be varied in construction and position so long as the two' cycle andQthe four cycle phases are pre served. It is of course possible to have en'- tirely different sets of valves for the two sequences, butsimplicity of parts induces me to make the exhaust valve 7 a member of both sets. 1 v

The compression space for the'two cycle sequence of phases, is in this case the crank case. It is cle'ar that the compressioncha-mber might be entirely separate, and the convertibility ofthe'engine secured. The plunger in the compression space in this engine is the piston. It might be entirely separate from the piston, but simplicity of construction demands the present form as prefer able. This convertible principle may be ap-' plied to a multiple cylinder engine, a rotary engine, a sin le or'compound engine, or,a single or douile actingcylinder engine, or any other type of'engine. v p

The lever that converts the engine may be of any type desired, or it may be any meing except when the notch permits the roller chanical equivalent, operated directly or indirectly.

Many changes may be made in the details of the engine and the application of the ideas without departing from my invention. If the rollers upon the valve stem should slide with relation to the cam shaft, such a movement would be equally effective in switchingthe cams. Many other mechanical movements may accomplish the same purpose.

What I claim is 1. In an explosion-engine, in combination, a piston, a cylinder, and puppet inlet and exhaust valves for the four cycle sequence, valves for the two cycle sequence, a

shaft, two sets of cams one for the two cycle sequence, one for the four cycle sequence, 'means to switch said sets of cams alternately lnto action consisting in a sliding cam shaft, and a variable gear adapted to alter the speed of said camshaft to suit the alternate cycles. 7 V

2. In an explosion engine, in combination, a piston, a cylinder, and pup-pet inlet and exhaust valves for the four cycle sequence,

valves for the two cycle sequence, a shaft,

two sets of cams, one for the two cycle sequence and one for the four cycle sequence, means to switch said sets of cams alternately into action consisting in a sliding cam shaft,

a variable gear adapted to alter the speed of said cam shaft to suit the alternate cycles,

and a lever adapted to switch said cam shaft and change the speed of said variable gear to. cooperate therewith;

3. In an explosion engine, in combination,

a shaft, piston, cylinder, valves. and elec tric ignition devices, two sets of cams, one for a two cycle sequence, and one' for a four cycle sequence, means for switching said sets into action alternately consisting in a sliding cam shaft, and a variable gear to vary the speed of said cam shaft alternately for said sequences.

4. In an explosion engine, in combination, a shaft, piston, cylinder, valves and electric ignition devices, two sets of cams, one for a two cycle sequence, one for a four cycle sequence, means for switching said sets into action alternately, consisting in a, SlldHlg cam shaft, a varlable gear to vary the speed of said cam shaft alternately for said sequences, and a lever to shift said cam shaft, andchange the variable gear for said alternate sequences. v I

5. In an explosion engine, in combination, a shaft, piston cylinder, valves, spark plug and ignition circuits, two sets of cams, one for a two cycle sequence, and one for a four cycle sequence, -means for switching said sets into action alternately consist'ngin a sliding cam shaft, and a variable gear to vary the speed of said cam shaft alternately for said sequence.

6. In an explosion engine, in combination, a shaft, piston, cylinder, valves, spark. plug, and. ignition circuits, two sets o'fc a-ms'cne fora two cycle sequence, one for a'four ,=cycle sequence, means for switching-said sets into actionalternately consistingin a sliding cam shaft, a variable gear to vary the speed ofsaid cam 'shaft alternately forsaid sequences, and-a lever to shift said cam shaft and change the variable, gear to said alternate sequences.

7. 'In an explosion.eng1ne,1in combination,

a' shaft, piston, cylinder, inlet and exhaust valves, a two cycle compression device, valves therefor, ignition circuits, two cycle and four cycle cams for said. circuits and valves, a variablespeed gear and a lever to shift said cams and gearto a two cycle sequence or to 'a fourcycle sequence.

8. In an explosion engine, in combination,

four cycle cylinderinlet and exhaust valves,-

an auxiliary two-cycle compression device, 'valves therefor, two cycle cylinder valves, means to switch said four cycle valves and said two cycle valves into action alternately consisting in two sets of cams, a sliding cam shaft, and a variable gear adapted to vary the speedof said cam shaft.

9. In an explosion engine, in combination,

four cycle cylinder inlet and exhaust valves, an auxiliary two cycle compression device, valves -therefor,- two cycle .cyl-inder valves, means to switchsaid'four cycle valves and .said two cycle valves into action alternately consisting in-two sets of cams, a sliding cam shaft; a variable gear adapted to' vary the speed of said cam shaft, and alever to shift said cams and variable gear.

' In an explosion engine, in combination,; shaft, four cycle cylinder valves, a twocycle auxiliary compression space a piston working in said compression space con- 'nected to said shaft, inlet and transfer connections for said compression'space and the explosion chamber of said engine, two cycle valves, and means to shift said four cycle valves .'or saidtwo' cycle valves alternately into action, consisting in a sliding cam shaft, and a variable gear to vary the speed of said cam shaft. 2

11'.-In-an explosion engine, in combination, a shaft, four cycle cylinder valves, a

'two cycle cylinder compression space, a piston working in said compression space con; nected'to' said shaft, inlet and transfer connectlonsfor said compression space, and for 'the explosion'chamber of. said'engine, two

' cyclevalves; means to shift said four cycle -valves'orsaid two cycle valves alternately into "action, consisting in a sliding camshaft, a variable: gear to vary the speed of said cam shaft, and a lever to operate the same.

12. In "an'explosion engine, in combination, a shaft, four cycle cylinder valves, a two cycle cylinder compressionspace within the-crank case, a piston working in said compression space conne'ctedto sald shaft, inlet and transfer connections for said 'compression space and the explosion chamber of said .engine,'two cycle valves, means to shift said four cycle valves or said two cycle valves alternately-into action consisting. in a slid- .ing cam shaft, a variable gear 'to vary the speed-of said cam" shaft, and a lever'to operate the same. l

13. In an explosion engine, in comb nation,;a. set of four cycle valves, a two cycle auxiliary compression device, a set oftwo' cycle valves, electric ignition circuits anddevices for each cycle, and means to switch said valves and circuits from one cycle to the other consisting in' two sets of cams, a

sliding cam shaft, a variable gear and a lever to operate said cams, shaft and gear.

14. an explosion engine, in combina-' tion, asetof four cycle valves, a set of two a cycle valves, a cam shaft operating saidsets alternately, a water pump for cooling said delivery of said water pump and its cooling effect.

16(In an explosionengine, in combination, a set of four cycle valves and parts, a setof two cycle Valves and parts, a variable speed gear therefor, a cooling device, means for varying the relative cooling effect of said cooling device in switching from four cycle (sequence to two cycle sequence.

17. In an explosion engine, in combination, a variable speed gear therefor, a set of four cycle valves and parts,a set of two cycle valves and parts, a coolin device, means for varying the relative cooling effect of said cooling device when switching from four cycle sequence to two cycle sequence.

18. In an explosion engine, in combination, a; set of four cycle valves and parts, a

set of two cycle valves and parts, a water cooling device, means for varying the relative cooling effect of said cooling device in switching from the four cycle sequence '-'to the two cycle sequence.

19. In an explosion engine, in combination, a set of four cycle valves and parts, a.

set of two cycle valves and parts, a Water cooling pump, means for varyingt-he relative cooling effect of said pump in switching from four cycle sequence to two cycle sequence.

20. In an explosion engine, in combination, a set of four cycle valves, a set of two cycle valves, 'a cam shaft Operating said setsalternately, ajwater pump for cooling said engine operated by said cam 'shaft,

means for shifting said 'cam gshaft'. from" one cycle to the other. thereby varying the delivery of-said water pump and its-cooling effect, and a variable speed gear adapted to vary the speed of' said cam shaft.

'21. In an explosion engine,'1n comblnation, a cam shaft, a water pump for cooling said engine operated by said cam shaft,

shaft.-

means for shifting said cam shaft from one cycle to the other-thereby varying the delivery of. said water pump and its cooling efi'ect,lsaid means consistingin a variable gear adapted to vary the speed of said cam 22. In an explosion engine in combination, two sets of valves, atwo cycle set and a four cycle set, electric ignition. circuits, means for operating said circuits and valves for the two or the four cycle sequence consisting in a cam shaft, water cooling devices operated by said cam shaft, and 'a varlable gear tovary the speed of said cam shaft and associated devices for the alternate sequences;

23. In an explosion engine, in comblnation, two sets of valves, a two cycle set and a four cycle set, electric ignition circuits,

means for operating said circuits and valves cam shaft carrying said cams provided with a variable gear adapted to vary the speed of said cam shaft, means to shift said cams and variable gear consisting in an automatic 'governora 25. In an explosionengine, in combination, a piston, a cylinder, puppet inlet and exhaust valves for the four cycle sequence valves for the two cycle sequence, a shaft, two sets of cams, one for the two cycle sequence, one for the four cycle sequence,

means to switch said sets of cams alternately into -action consisting in a sliding cam shaft,

and a variable gear adapted to alter the speed of said cam shaftto suit the alternate cycles both operated by .an automatic gov-.

ernor actuated by variations in speed.

26. In anexplosion engine, in combination, a piston, a cylinder, puppet inlet'and exhaust valves" for the' four cycle sequence valves for the two cycle sequence, ashaft,

' and'two sets of cams one for the .two cycle sequence and one for the four cycle sequence, means to swltch said sets of ca'ms'alternately intof' 'action consisting in a sliding cam shaft, 7 a variable gear adapted to alter the speed of V,

automatic governor said cam shaft to suit the alternate cycles, and a lever adapted to switch said cam shaft and change the speed of said variable gear to cooperate therewith both operated by an actuated by variations in speed. I v Y Y 27. In a-convertible two' to four cycle explosion engine, in combination, a variable speed shaft for the two sequences and a plan etary gear, means for switching it from a half speed to a full speed and back again.

28. In a convertible two to four cycle explosionJengine, in combination, a variable speed cam shaft, a planetary gear, and a sliding key for said planetary gear to change the speed ofs'aid cam shaf 29. In an' explosion engine, in-combinat ion,-a piston, cylinder, four cycle valves and parts, a two cycle auxiliary compression space, two cycle valves and.parts, electric lgnition devices and circuits for each cycle, a cooling device and means for varying its cooling effect-relative to each cycle, and

means for switching said apparatus from one cycle to the other.

I 30. In an internal combustion engine, having two cycle valves and other means for scavenging and compressing afresh combustible gas duringeach' instroke and ignit ing and expanding during each out stroke; and havmg four cycle valves and other means for compressinga combustible gas during every alternate 1nstroke,'igniting and expanding during the succeeding out strokes, exhausting and admitting fresh gas during the next in and out strokes respectively; means for operating said valves, means to and shift into operation said four cycle valves,'an d vice versa. 31. In an internal combustion engine, having two cycle valves and other means for scavenging and compressing afreshcombustible gas during each instroke and igniting and expanding during each out stroke; and having four cycle yalves and other means for compressing a combustible gas during every alternate instroke, igniting and expanding during the succeeding out strokes, exhausting and admitting-fresh gas shift out of operation said two cycle valves during the next in and out strokes respectively; means for operating said valves, a cam shaft, cams for said two cycle'valves,

cams for said four cycle 'valves, and means to shift sa1d cams alternately into action, consisting in a shding cam shaft.

32. In aninternal combustion engine, having two cycle valves and other means for scavenging and compressing a fresh combustible gas during each instroke and ignitingand expanding during each out stroke; and having four cycle valves and other .means for compressing a combustible gas duringevery alternate lnstroke, igniting and V expanding during the succeeding out st rokeslli-i exhausting and admitting fresh gas during the next iin and out strokes respectively; means for operating said valves, a cam shaft, cams for'said two cycle valves, cams for said four cycle valves. and means to shift said cams alternately'into action consisting in" a sliding'cam shaft.

38. In an internal'combustion engine, having two cycle valves and other means for and circuits from two cycle operation.

34. In an internal-coinlulstion engine. having'tivo cycle valves and other means for scavenging and compressing a fresh combustible gas during each instroke and igniting' and expandingduring each out stroke;

and having four cycle .valves and other means for compressing acombustible gas during .evcrvalternate instroke, igniting and eXpandin-gdurin-g the succeeding out strokes, exhausting and admitting'fresh gas during 'the next in and outstrokes respectively,

means'for operating said valves, igniting devlces and circuits cooperating wlth said 'two cycle means and. said four cycle means,

and 'means to switch said igniting devices and circuits from two cycle-operation to four cycle operation consisting in cams adapted to be alternately shifted int-o action. l

35. In an internal combustion engine, havingtwo cycle valves and other means for scavenging and compressing a fresh com- -bustible gas during each instroke and ignit- 'ing and expanding during each out stroke; and havmg four cycle valves and other means for compressing acombustible gas during every alternate instroke, igniting and expanding during the succeeding out strokes, exhausting and admitting fresh gas during the ncxt'iniand out strokes respectively, means for operating said valves, igniting devices and circuits cooperating with said I two cycle means and said fourcvcle means,

and means to switch said ignitingndevices "and circuits from two cycle operation to four cycle operation consisting in cams adapted to be. alternately shifted into action by a sliding cam shaft.

36. I11 an internal combustion engine, having two cycle valves and other means for scavenging and compressing a fresh combustible gas during each in'stroke and igniting and expanding during each out stroke; and having four cycle valves and" other means for compressinga combustible gas during every alternate instroke, igmting and expanding during thesucc'eeding out strokes, exhausting 'and admitting fresh gasduring the neXt in and out strokes respectively; meansfor operating said valves, means to shift out of operation said-two cycle valves and'shift into operation said four cycle ating with said-two cycle means and said igniting devices and circuits from two cycle operation to four cycle operat on.

scavenging and compressing a fresh combustible gas durmg each lnstroke and lgmtmg' for compressing a combustible gas during exhausting and admitting fresh gas during the next in and out strokes respectively; means for operating said valves, means to shift out of operation said two cycle valves and, shift into operation said four 'cycle operation to four cycle operation consisting in cams adapted to be alternately shifted into action.

scavenging and compressing. fresh combustible gas during each mstro and expanding during each cut stroke; and

during the succeeding out-strokes, exhaust in and .out strokes respectively; means for operating said valves, meaiasto shift out of operation said two cycle valves and shift into operationsaid-four cycle valves, igniting devices and'circuits cooperating with said two cycle means and said four cycle means, and

'- circuits from two cycle operation to four cycle operation consisting in cams adapted'to be alternately shifted into action by'a sliding cam shaft.

scavenging and compressing a fresh combuslandexpanding during each outstroke; and having four cycle valves and other means for four cycle means, and means to switch said 37. In an internal combustion engine, havmg two cycle valves and other means for valves, igniting devices and circuits coop-. crating with said two cycle means and said four cycle meanstand means to switch said. igniting devices and circuits from two cycle re and-igniting having-"four cycle valves and other means for compresslng a combustible gas during every alternate mstroke, igniting and expandlng-j ing and admitting fresh gas during the next.

39. In an internal combustion engine, havmg two cycle valves and other means forcompressing a combustible gas during every valves, igniting devices and circuits cotiperand expanding during each, out stroke; and i. 'hHNIDg four cycle valves and other means every alternate instroke, ignitingf and ex-. 4

panding during the succeeding out strokes, 9o.

38. In an internal combustion engine, havmg two cycle valves and other means formeans to switch said igniting devices and tible gas during" each instroke and igniting.

1 ing two cycle valvesa'ndother means for "scavenging and compressing a fresh combusalternate instroke, igniting and expanding during the succeeding out strokes, exhausting and admitti'ngfresh gas during the. next'- in and out strokes respectively; means for operating-said valves, means to shift-out of operation said two cycle valves-and shift into operation said four cycle valves, igniting devices and circuits cooperating with said two cycle means andsaidfour cycle means, and means to switch said igniting devices and circuits from two cycle operation to four cycle operation consisting in cams adapted 'to be alternately shifted into action by a sliding cam shaft and by a variable gear."

40. In an internal combustion engine, havtible gas during each instroke and igniting and expanding during each out stroke; and hav-- ing four cycle valves and other means for cornpressing a combustible gas during every alternate instroke, igniting and expanding during the succeeding out strokes, exhausting and ad- -mitting fresh gas during thenext'in and out strokes respectively; means for operating said valves, means to shift out of operation sa d two cycle valves and shift into opera.-'

- tion said four cycle valves, shifted by an automatic governor under variations of speed.

41. In an internal combustion engine, having two cycle valves and other means for scavenging and compressing a fresh combus tiblegas-during each instroke and igniting and expanding during each out stroke; and having four cycle valves and other means for v compressmg acombustiblejgas during every alternate instroke igniting and expanding.

during the succeeding out strokes, exhausting two cycle valves and other means for scavenging andcompressing a fresh combustible gas during each instroke and igniting and expanding during each out-stroke; and

having four cycle valves and other means for compressing a combustible gas duringevery alternate iustroke, igniting and ex-' panding during the succeeding out strokes, exhausting and admitting'fresh gas during" the next in ii-DdxOlli) strokes respectively; means for operatingsaidvalves, means" to shift out of operation said two cycle valves and shiftinto' operation said four cycle valves, consisting in cams adapted to be alternately shiftedintoactibnby a variable gear shifted by an automatic governor under} variations of speed.

expanding during the succeeding strokes, exhausting and admittlng fresh gas 43. ,In an internal combustion engine,hav-

ing two cycle valves and other means for scavenging and compressing a fresh combustible gas. during each instroke and igniting and expanding during each out stroke and having four. cycle valves and other means for compressing a combustible gas expanding" during" the succeeding duringthe next in andout strokes respectively; means for operating said valves,

.means to shift out of operation said two cycle valves and shift into operation said four cycle valves, a locking device to prevent shifting, and means to unlock said locking device at the proper moment for conversion. Y

44. In an internal combustion engine, having two cycle valves'an'd other means forscavenging and compressing afresh combustible gas during each instroke and-igniting andexpanding during each out stroke; and having four cycle; valves and other means for compressing a combustible gas during every alternate instroke, igniting and expanding during the succeeding out strokes, exhausting an admitting fresh gas during the next in and out strokes respecduring every alternate instroke, igniting and out strokes, exhausting andadmitting fresh gas tively, means for operating said valves,

means to shift 'out of operation said two a cycle. valves andshift into operation said 'fou'r cycle valves, a variablegear, acoo-ling device, and means coiiperating with said speed gear to operate said cooling; device at different-speeds for either cycle. I

- 45.. In an internal-combustion engine, having twocycle valves and other means, for scavenging and compressing a fresh combustible gas during each .instroke' and igniting 'and expanding during each out stroke;

and having four cycle valves and other means for' compressing a combustible gas during every alternate instroke, igniting and out duringthe next in and out strokes 'respec tively; means for operating said valves,

means to shift out of operation said'two cycle" valves and shift into operatlon said four cycle'valves, igniting devices and circuits cooperating with said two cycle means- -.,and said "four cycle means, and, means to switch said igniting devices and circuits from; twocycle operation to four cycle operation, a cooling device, and means'to operate said cooling device at d fferent speeds for either. cycle.

. 46. In an internal. combustion engine,hav-

soaven ing and compressing a fresh coi nb'ustib e gas during each instroke and ignitand having four cycle valves and other "means" foFcompressing a combustible gas during every alternate in'stroke, igniting ing two cycle valves and other means for i25 ing and expanding during each out stroke;

" and expanding during the. succeeding out strokes, exhausting and admitting fresh gas during the-next inand 'outi'strokes respec-'- tively; means 'foroperating sald valves,

means to shift out of operat on 5211C]. two

' cycle valves and shift into operation said four cycle valves, igniting devices and circuits cooperating with said two' cycle means and said four cycle means, and means to switch said -'igniting devices and '-c'ircuits from two cycle operation to fou'rcycle operation, a variable-gear, a cooling device,- and means cooperatingwith said speed gear to operate said cooling device at 'difierent speeds for either cycle.

4:7. In an internal combustlon'engine, 111

combination, a set of. four cycle; valves, a

two cycle auxiliary compresslon space, a set of two cycle valves, alternate ignition devices andcircuits-for the two cycles, a water cooling "device and combined means for changing its: cooling effect and, shifting said valves from the four cycle to the'two cycle method of operation. I

l8. In an internal combust on engine, 1n

' combination, a set of fourcyclevalves, a two cycle auxlliary compresslon space, a set of two cycle valves, electrlcign tlon devlces' two cycle auxiliary compression space, a set of two cycle valves, electric ignition devices and c1rcu1 ts for each-cycle, awater coollng device, combined means for changing its cooling effect and shifting said valves from the four cycle to the two cycle methodef operation, including a variable gear and a .lever to vary the speed of the cooling device throughs aidgear.

signaturein presence of two witnesses. Y CHARLES F. HOPEWVELL.

\Vitnesses:

M nion-FRANCIS HILL,. A. P. TEELE.

In testimony whereof I'have afiixed my'f45

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