US833676A - Rotary engine. - Google Patents

Description

. PATE-MED 00:17.16, 1906.

J. F. Go0LBY. ROTARY ENGINE. APPLICATION FILED MAB.. 5, 1906.

2 SHEETSSHBET 1.

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J. P. cooLEY.

ROTARY ENGINE.

APPLIoATIoN FILED 1mm, 190s.l

2 SHEETS-SHEET 2.

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UNITED STATES i PATENT OFFICE.

JOHN F. COOLEY, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO CHARLES F. VVEED, RECEIVER, OF BROOKLINE, MASSACHUSETTS.

ROTARY` ENGINE.

v No. 833,676.

Specification of Letters Patent.

Patented Oct. 16, 1906.

- and it consists in certain structural improvee effort of admitted steam.

ments by which the engine is rendered economical of power, highly effective in contrast to the size and weight of the parts employed, wear-resisting, durable, and simple.

l In the drawings hereto annexed,. which illustrate an embodiment of my invention,

Figure l is a side elevation of an engine with one of the heads and a cheek-plate removed. Fig. 2 is a vertical longitudinal section of the engine cylinder and heads, showing the rotative parts in elevation. Fig. 3 is a side elevation of one of the cheek-plates, and Fig. 4 is a side elevation 1showing the interior of one of the heads with the engine-shaft in cross-section.

The type of engine to which my improvements are applied, as illustrated in the drawings, is that characterized by a radially-slotted disk or spidersecured to the engine-shaft, which is mounted eccentrically to rotate within a cylinder and carrying in the radial slots the radially-moving pistons, which by contact with the interior surface of the cylinder serve as pistons to receive the expansive Moreover, for the ysake of simplicity and strength I have adopted the cylindrical roller form of pistons, which by reason of their rolling friction upon the cylinder as distinguished from the scraping vor rotating friction of wings or vanes of other .sorts iniiict but little abrasion and wear upon the cylinder, which reciprocally wears the rollers but little.

The cylinder A is provided with a steamport (L2 and an exhaust-port (L3 and is peripherally chambered at (L 0L', the chamber LL communicating with the steam-inlet port a2 and the chamber a with the exhaust-port CL3.

v The internal webs (L4 divide these peripheral steam-chambers from one another. The two ends of the cylinderA are bored outat a, so as to provide seats for the cheek-plates a5, and steam-inlet passages 0L11 and exhaustpassages L13 are formed by drilling longitudii nally through the material of the cylinder into the peripheral chambers a and cL, respectively. The cylinder-heads (L6 are preferably made duplicates of each other and are counterbored at 0L 8 to correspond with the counterbore a of the cylinder-head A and are still further counterbored at (L14 to provide cylindrical chambers for the accommodation of the roller-bearings @15, presently to be described. Bolts (L7 pass through the cylinderheads and suitable lugs formed upon the cylinder, and when the cheek-plates are set in the cavities formed by the opposite counterbores L9 and as and the plates (L7 are `set up the cheek-plates are then and by this means clamped securely to the cylinder.y The shaft c passes through the cylinder-heads and cylinder, with its axis eccentric to the cylinderbore. The spider B is secured by any desired mode to the shaft c, and roller-pistons C are placed in the slots c of the spider-ring B. The bosses al? of the cylinder-heads (L6 are threaded, so as to receive the adjustable hollow cap or stuffing-box in the usual manner.

One of the cheek-plates L5 (or, ifv desired,

both of these) is formed with depressions ory holes L10 (112, which register with the' steamopening L11 and the exhaust-openings (L13, respectively. The cavity al has formed in communication with it the lead-port am and the follower-port e101, which perform an office presently to be described.

As the rotative speed of a rotary engine is very much higher than that of a reciprocating engine of approximately thesame power, the centrifugal throw of the roller-pistons C is a considerable factor, and while with very small engines it may be admissible practice to make these roller-pistons soli d it is preferable in all cases and almost essential in larger engines to reduce theweight of the pistonrollers C as much as possible, and for this reason I employ for thesey rollers hollow cylinders securely headed at their ends, and thus reduce even that rolling friction which is practically the only source of wear to which the cylinder is subjected.

The shaft c is mounted and rotates upon the roller-bearings (L15, which are arranged in the cylindrical chamber CL14 in the cylinder-heads. These roller-bearings consist of steel rings, and in orderto dispense with the expense and complicationl of special ball or roo roller races I employ rollers 0,15, which bear directly upon the shaft c at one side and u on the interior of the chamber a at the ot er. For this purpose if the rollers (L15 are made of the same diameter as the shaft c six of these rollers can be conveniently arranged in the roller-chambers L14 and serve admirably to reduce the friction due to the rotation of the parts. The employment of rings instead of balls or solid rollers affords a slight degree of play, due to the greater elasticity of these rings, than could be obtained from balls or solid rollers, so that in addition to the antifriction-bearing I secure also the benefit of what is in substance a spring suspension, though of course the possible scope of actual movement of such springs is very slight.

The cylindrical recesses 0,14 are relatively quite large, having a diameter substantially equal to that of the spider B, so that in addition to serving as an annular ra'ceway for the roller-bearings 1,15 this chamber assists in equalizing the expansions of the cylinderheads and cheek-plates by affording an external chamber into which steam may penetrate and jacket the ends of the engine.

In the operation of the engine each two consecutive roller-pistons C constitute the front and rear abutments against which the expansive effort of the steam reacts, and as the space included between two consecutive roller-pistons, the outer cylinder-wall, and the surface of the spider B can only enlarge by rotation of the spider D and its attached shaft c steam admitted to this space causes the spider and shaft to rotate. In order to insure effective contact between the rolleri piston C and the internal wall of the cylinder A, the hollow steam-port cavity am, formed in the cheek-plate a5, is made to extend toward the shaft c a sufficient distance to admit steam into 'the spider-slots c inside the roller-piston C. Ordinarily when the engine is in full operation the centrifugal throw of the roller-piston vC will be sufficient to hold them in contact with the wall of the cylinder A; but should the rate of rotation be slow or the engine be standing still the admission of steam behind the piston will be effectual to insure this necessary\ contact. For this purpose also the lead and follower extensionp'orts am and al are provided, the angular distance between the extreme ends of these two supplemental ports being sufficient to span the space between two consecutive piston-slots c. Thus if the engine be standing still steam on being admitted will pass through the lead-port or follower-port, or both, and throw the two piston-cylinders C, which are for the time being the effective pair, into contact with the cylinder-wall and incidentally place the engine in economical operative condition. The cylinder A, spider B, and roller-piston C are so proportioned that the lateral surfaces of the spider and roller-pistons shall nearly, but not quite, fill the space longitudinally between the cheekplates a5, the clearance being so slight that the plane surfaces of the spider B and the ends of the roller-pistons shall be steampacked in relation to the cheek-plates a5. This clearance, however, is sufficient to permit the gradual penetration of steam of the several cavities in the engine-casing and engine-head, so that not only shall the cheekplates a5 be steam-jacketed by the cylindrical cavities a, but also the spider B and piston-rollers C shall be held balanced in the cylinder. rIhe suspension of the engineshaft upon the rollers a,15 relieves the shaft of all bearing friction, except such as may be incident to the necessary packing of the two ends of the shaft. By attaching a lubricator to the steam-supply pipe enough oil is carried into the en ine to lubricate the rollerpiston C and ro ler-bearings a sufficiently for all working urposes.

The effect of t e roller-pistons C traveling in rolling contact upon the inner lcylinderwall is merely to polish the cylindrical surface until they acquire a mirror finish. Examination of engines of this character which have been in use for several months 'shows that only these cylindrical surfaces and also the cylindrical surfaces of the cavities at14 and roller-bearings 'w15 show the effect of wear; but the cheek-plates a5 are not worn, showing that the effect of balanced steam-pressure within the cylinder is fully obtained. Moreover, the rolling friction of the piston C upon the cylinder A does not develop any perceptible wear other than that evidenced by the polished surfaces after several months continuous use.

The exhaust -cavity a12 occupies about twice as much angular distance as the steamadmission cavity all and operates to open the exhaust cumulatively as each piston C passes from one end to the other of the exhaust-cavity, so that as the space between the spider B, cylinder A, and two consecutive pistons C is'contracting the exhaust-relief proportionately increases its capacity. Leading from the exhaust depression (L12 is a duct e103, passing through the cheek-plate a5 and communicating with the roller-bearing chamber to admit "steam into said Ychamber for the purpose of steam-jacketing the ends of the engine and also assisting to lubricate the roller-bearings.

It will be observed by referring to Fig. 3 that as the steam-admission `cavity alo extends inward radially to a point inside the piston-roller C a spot al is provided whose surface is flush with the surface of the cheekplate a5, so that at no time can roller C lose its proper bearing or position and collide with the edges of the cavity alo. The exhaustcavity cl2 has its inner edge located farther from the center than the innermost ports of IOC IIO

the roller-pistons, so that here again there is no opportunity for these pistons to become dislodged from their proper positions -with reference to the cylinder and cheek-plates a5.

I claim as my invention- 1. In a rotary engine, the combination of an annular cylinder provided with a steaminlet, a steam-outlet and longitudinal perforations communicating respectively with the said inlet and outlet, cheek-plates bored to admit the rotor-shaft and provided with hollows registering respectively with the steam and exhaust perforations of the cylinder, a rotor consisting of 'a radially-slotted disk mounted on a shaft, the said shaft eccentrically mounted in the cylinder, roller-pistons in the radial slots o f the disk, cylinder-heads, and means to clamp the same against the cheekplates to bind said cheekplates against the cylinder, said heads being longitudinally bored to admit the rotor-shaft.

2. In a rotary engine, the combination of -an annular cylinder provided with a steaminlet, a steam-outlet and longitudinal perforations communicating respectively with the said inlet and outlet, cheek-plates bored to admit the rotor-shaft and provided with hollows registering respectively with the steam and exhaust perforations of the cylinder, the` steam-admission hollow provided with lead and the follower extension-ports, a rotor consistin of a radially-slotted disk mounted on a sha t, the saidshaft eccentrically mounted in the cylinder, roller-pistons in the radial slots of the disk, cylinder-heads, and means to clamp Vthe same against the cheek-plates to bind said cheek-plates against the cylinder, said heads being longitudinally bored to admit the rotor-shaft.

3. In a rotary engine, the combination of an annular cylinder provided with a steaminlet, a steam-outlet and longitudinal perforations communicating respectively with the said inlet and outlet, cheek-plates bored to admit the rotor-shaft and provided with hollows registering respectively with the steam and exhaust perforations of the cylinder, the steam-admission hollow provided with lead and the follower extension-ports, said steamadmission hollow extending radially to a point inside the path of the roller-pistons, a rotor consisting of a radially-slotted disk mounted on a shaft, the said shaft eccentrically mounted in the cylinder, roller-pistons in the radial slots of the disk, cylinder-heads, and means to clamp the same against the cheekplates to bind said cheek-plates against the cylinder, said heads being longitudinally bored to admit the rotor-shaft.

4. In a rotary engine the combination of an annular cylinder provided with a steaminlet, a steam-outlet and longitudinal perforations communicating respectively with the said inlet and outlet, cheek-plates bored to admit the rotor-shaft and provided with hollows registering respectively with the steam and exhaust perforations of the cylinder, the steam-admission hollow provided with lead and the follower extension-ports, said steam-` admission hollows extending radially to a point inside the path of the roller-pistons, a spot in said steam-hollow flush with the surface of the cheek-plate and lying in the path of the roller-pistons, the exhaust-hollow having its inner boundary outside of the inner edge of the path of the roller-pistons, a rotor consisting of a radially-slotted disk mounted on a shaft, the said shaft eccentricallv mounted in the cylinder, roller-pistons in the radial slots of the disk, cylinder-heads, and means to clamp the same against the cheek-plates to bind said cheek-plates against the cylinder said heads being longitudinally bored to admit the rotor-shaft.

5. In a rotary engine the combination of an annular cylinder provided with a steaminlet, a steam-outlet and separated peripheral jacket-cavities, one communicating with the steam-inlet and the other with the steamoutlet and with longitudinal perforations from the said jacket-cavities, cheek-plates eccentrically bored to admit the rotor-shaft and provided with hollows registering with the steam and exhaust perforationsrespectively, a rotor consisting of a radially-slotted disk secured to a shaft eccentrically mounted with respect to the cylinder, roller-pistons in the disk-slots, cylinder-heads, and means to clamp the same against the cheek-plates to bind the latter to the cylinder, said heads being longitudinally bored to admit the rotorshaft.

, 6. In a rotary engine the combination of an annular cylinder provided with a steaminlet, a steam-outlet and separated peripheral ljacket-cavities, one communicating with the steam-inlet and the other with the steamoutlet and with longitudinal perforations from the said j acket-cavities, cheek-plates bored to admit the rotor-shaft and provided with hollows registering respectively with the steam and exhaust perforations of the cylinder, the steam-admission hollow provided with lead and the follower extensionports, a rotor consisting of a radially-slotted disk secured to a shaft eccentrically mounted with respect to the cylinder, roller-pistons in the disk-slots, cylinder-heads, and means to clamp the same against the cheek-plates to bind the latter to the cylinder, said heads beingflongitudinally bored to admit the rotorsha t.

IOO

7. In a rotary engine the combination of with hollows registering respectively with thesteam and exhaust perforations of the cylinden the steam-admission hollow provided with lead and follower extension-ports, said steam-admission hollow extending radially to a point inside the path of the rollerpistons, a rotor consisting of a radially-slotted disk secured to a shaft eccentrically mounted with respect to the cylinder, rollerpistons in the disk-slots, cylinder-heads, and means to clamp the same against the cheekplates to bind the latter to the cylinder, said heads being longitudinally bored to admit the rotor-shaft. f

8'. In a rotary engine the. combination of an annular cylinder provided with a steaminlet, a steam-outlet and separated peripheral jacket-cavities, one communicating with the steam-inlet and the other with the steamoutlet and with longitudinal perforations from the said acket-cavities, cheek-plates bored to admit the rotor-shaft and provided with hollows registering respectively with the steam and exhaust perforations of the cylinder, the steam-admission hollow provided with lead and follower extension-ports, said steam-admission hollow extending radially to a point inside the path of the rollerpistons, a spot in said steam-hollow flush with the surface of the cheek-plate and lying in the path of the roller-pistons, the exhausthollow having its inner boundary outside of the inner edge of the path of the rollerpistons, a rotor consisting of a radially-slotted disk secured to a shaft eccentrically mounted with respect to the cylinder, rollerpistons in the disk-slots, cylinder-heads, and means to clamp the same against the cheekplates to bind the latter to the cylinder, said heads being longitudinally bored to admit the rotor-shaft.

9. In a rotary engine the combination of an annular cylinder provided with a steaminlet, a steam-outlet and peripheral separated jacket-cavities communicating with the steam-inlet and steam-outlet respectively, the ends of the cylinder counterbored to admit cheek-plates and the cylinder provided with perforations extending from the jacketcavities to the counterbored portions, cheekplates fitted to and seated in the cylindercounterbores and eccentrically bored to admit the rotor-shaft, said cheek-plates provided also with hollows registering with the steam and exhaust perforations of the cylinder respectively, a rotor consisting of a radially-slotted disk secured t0 a shaft eccentrically mounted in the cylinder, roller-pistons working in the di sk-slots, cylinder-heads, and means to clamp the same against the cheekplates to secure the latter to the cylinder and bored to admit the rotor-shaft.

1'0. In a rotary engine the combination of an annular cylinder provided with a steaminlet, a steam-outlet and peripheral separated jacket-cavities communicatingwith the steam-inlet and steam-outlet respectively, the ends of the cylinder counterbored to admit cheek-plates and the cylinder provided with perforations extending from the jacketcavities to the counterbored portions, cheekplates fitted to and seated in the cylindercounterbores and eccentrically bored to admit the rotor-shaft, said cheek-plates provided also with hollows registering with the steam and exhaust perforations of the cylinder respectively, the steam-admission hollow provided with lead and follower extensionports, a rotor consisting of a radially-slotted disk secured to a shaft eccentrically mounted in the cylinder and roller-pistons working in the disk-slots, cylinder-heads, means to clamp the same against the cheek-plates to secure the latter to the cylinder and bored to admit the rotor-shaft.

l1. .In a rotary engine the combination of an annular cylinder provided with a steaminlet and a steam-outlet and peripheral separated jacket-cavities communicating with the steaminlet and steamoutlet respectively, the ends of the cylinder counterbored to admit cheek-plates and-the cylinder provided with perforations extending from the jacket-cavities to the counterbored portions, cheek-plates fitted to and seated inthe cylinder-counterbores and eccentrically bored to admit the rotor-shaft, said cheek-plates provided also with hollows registering with the steam and exhaust perforations of the cylinder respectively, the steam-admission hollow provided with lead and follower extensionports and a spot in the steam-admission hollow flush with the surface of the cheek-plate and lying in the path of rotation of the piston-rollers, a rotor consisting of a radiallyslotted disk secured to a shaft eccentrically mounted in the cylinder, roller-pistons working in the disk-slots, cylinder-heads, and means to clamp the same against the cheeklates to secure the latter to the cylinder and ored to admit the rotor-shaft.

12. In a rotary engine the combination of an annular cylinder provided with a steaminlet and a steam-outlet and peripheral separated jacket-cavities communicating with the steaminlet and steam outlet respectively, the ends of the cylinder counterbored to admit cheek-plates, and the cylinder provided with perforations extending from the jacket-cavities to the counterbored portions, cheek-plates fitted to and seated in the cylinder-counterbores and eccentrically bored to admit the rotor-shaft, said cheek-plates provided also with hollows registering with the steam and exhaust perforations of the cylinder respectively, the steam-admission hollow provided with lead and follower extensionports and a spot in the steam-admission hollow flush with the surface of the cheek-plate and lying in the path of rotation of the pis- IOC ton-rollers, the exhaust-hollow having its inner margin outside of the inner edge of the path of the roller-pistons, a rotor consisting of a radially-slotted disk secured to a shaft eccentrically mounted in the cylinder, rollerpistons working in the disk-slots, cylinderheads, means to clamp the same against the cheek-plates to secure the latter to the cylinder and bored to admit the rotor-shaft.

13. In a rotary engine the combination of an -annular cylinder provided with a steaminlet and a steam-outlet and longitudinal perforations communicating respectively with the said inlet and outlet, cheek-plates bored to admit the rotor-shaft and provided with hollows registering respectively with the steam and exhaust perforations of the cylinder, a rotor consisting of a radially-slotted disk mounted on a shaft, the said shaft ecc entrically mounted in the cylinder, roller-pistons in the radial slots of the disk, said rollerpistons being hollow and headed at the ends, cylinder-heads, and means to clamp the same against the cheek-plates to bind said cheekplates against the cylinder, said heads being longitudinally bored to admit the rotorshaft.

14. In a rotary engine, the combination of an annular cylinder provided with a steaminlet and a steam-outlet and longitudinal perforations communicating respectively with the said inlet and outlet, cheek-plates bored to admit the rotor-shaft and provided with hollows registering respectively with the steam and exhaust perforations of the cylinder,` a rotor consisting of a radiallyslotted disk mounted on a shaft, the said shaft eccentrically mounted in the cylinder, roller-pistons in the radial slots of the disk, said roller-pistons being hollow and headed at the ends, cylinder-heads, and means to clamp the same against the cheek-plates to bind said cheek-plates against the cylinder, said heads being longitudinally bored to admit the rotor-shaft, and said heads being counterbored around the shaft-bearing.

15. In a rotary engine the combination of an annular cylinder provided with a steaminlet and a steam-outlet and longitudinal perforations communicating respectively with the said inlet and outlet, cheek-plates bored to admit the rotor-shaft and provided with hollows registering respectively with the steam and exhaust perforations of the cylinder, a rotor consisting of a radially-slotted disk mounted on a shaft, the said shaft eccentrically mounted in the cylinder, roller-pis-` -tons in the radial slots of the disk, said roller-pistons being hollow and headed at the ends, cylinder-heads, and means to clamp the same against the cheek-plates to bind said cheek-plates against the cylinder, said heads being longitudinally bored to admit the rotor-shaft, and said heads being counterbored around the shaft-bearing, said counterbores being substantially of the same diameter as the radially-slotted disk of the rotor.

16. In a rotary engine the combination of an annular cylinder provided with a steaminlet and a steam-outlet and longitudinal perforations communicating respectively with the said inlet and outlet, cheek-plates bored to admit the rotor-shaft and provided with hollows registering respectively with the steam and exhaust perforations of the cylinder, a i rotor consisting of a radiallyslotted disk mounted on a shaft, the said shaft eccentrically mounted in the cylinder, roller-pistons in the radial slots of the disk, said roller-pistons being hollow and headed at the ends, cylinder-heads, means to clamp the same against the cheek-plates to bind said cheek-plates against the cylinder, said heads longitudinally bored to admit the rotor-shaft, said heads counterbored around the shaft-bearing, said counterbores being substantially of the same diameter as the radially-slotted disk of the rotor, and rollerbearings between the shaft and the cylindrical eriphery of the counterbores in said heads earing directly upon the shaft and the counterbored peripherles.

17. In a rotary engine the combination of an annular cylinder provided with a steaminlet and a steam-outlet and peripheral separated jacket-cavities communicating with the steam-inlet and steam-outlet respectively, the ends of the cylinder counterbored to admit cheek-plates, and the cylinder provided with perforations extending from the jacket-cavities to the counterbored portions, cheek-plates fitted to and seated in the cylinder-counterbores and eccentrically bored to admit the rotor-shaft, said cheek-plates provided also with hollows registering with the steam and exhaust perforations of the cylinder respectively, the steam-admission hollow provided with lead and follower extension-ports, and a spot in the steam-admission hollow flush with the surface of the cheek-plate and lying in the pathof rotation of the piston-rollers, the exhaust-hollow having its inner margin outside of the inner edge of the path of the roller-pistons, a rotor consisting of a radially-slotted disk mounted on a shaft, the said shaft eccentrically mounted in the cylinder, roller-pistons in the radial slots of the disk, said roller-pistons being hollow and headed at the ends, cylinder-heads, means to clamp the same against the cheekplates to bind said cheek-plates against the cylinder, said heads longitudinally bored to admit the rotor-shaft, said heads counterbored around the shaft-bearing, said counterbores being substantially of the same diameter as the radially-slotted disk of the rotor, and roller-bearings between the shaft IOO IIO

and the Cylindrical periphery of the counterbores in said heads bearing directly upon the shaft and the oounterbored peripheries.

18. In a rotary engine the Combination of an annular cylinder provided with a steaminletv and a steam-Outlet and peripheral separated jacket-cavities communicating with the steam-inlet and steam-Outlet respectively, the ends Oi the cylinder counterbored to admitV cheek-plates and the cylinder provided with perforations extending Jfrom the jaoket-cavities to the eounterbored portions, cheek-plates fitted to and seated in the Cylinder-oounterbores and eoeentrioally bored to admitA the rotor-shaft, said Cheekeplates provided also with hollows registering with the steam and exhaust perforations of the Cylinder respectively, the steameadmission hollow provided with lead and follower extensionports, and a spot in the steam-admission hollow hush-With the surface of the eheel -plate and lying in the path of rotation of the pistonrollers, the exhaust-hollow having its inner margin outside of the inner edge of the path of the roller-pistons, a rotor consisting of a radially-slotted disk mounted on the shaft, the said shaft eoeentrieally mounted in the cylinder, roller-pistons in the radial slots of the disk, said roller-pistons being hollow and headed at the ends, cylinder-heads, means to clamp the same against the cheek-plates to bind said cheek-plates against the cylinder, said'he'ads longitudinally bored to admit the rotor-shaft, said heads eounterbored around the shaft-bearing, said eounterbores being substantially of the same diameter as the radially-slott'ed disk of the rotor, and rollerbearings between the shaft and the cylindrieal periphery of the eounterbores in said heads bearing directly upon the Shaaaadftae 4o eounterbored peripheries, the said rollerlearings Consisting of annular resilient Cyliners.

19. In a rotary engine the combination of an annular Cylinder provided with a steaminlet and a steam-outlet and longitudinal perforations Communicating respectively with the said inlet and outlet, cheek-plates bored to admit the rotor-shaft and provided with hollows registering respectively with the steam and exhaust perforation's of the cylinder, a rotor oonsistinfT Of a radially-slotted disk mounted on a sha t, the said shaft eccentrieally mounted in the cylinder, roller-pistons in the radial slots ofthe disk, said rollerpistons being hollow and headed at the ends, cylinder-heads, means to ela'mp the same against the Cheek-plates to bind said cheekplates against the cylinder, said heads longitudinally bored to admit the rotor-shaft, said heads counterb Ored around the shaftbearing, said Oounterbores being substantially of the same diameter as the radially-slotted disk of the rotor, and roller-bearings between the shaft and the cylindrical periphery of the oounterbores in said heads bearing directly upon the shaft and the eounterbored peripheries, and a steam-inlet port leading from the exhaust-hollow of the cheek-plate to the roller-bearing chamber within the counterbore ofthe cylinder-head.

Signed by me at Boston, Massachusetts, this 21st' day of February', 1906.

JOHN F. OOOLEY.

Witnessesi' JOSEPH T. BRENNAN, ROBERT CUsHMAN.

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