US274476A - Territory - Google Patents

Description

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Patented Mar. 427', 1883.

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I. N. FORBES.

ROTARY ENGINE. No. 274,476.

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Patented Mar. 27, 1883.

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I. N. FORBES. ROTARY ENGINE.

Patented Ma.1.27,1883.

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UNITED STATES PATENT EEicE.

ISAAC NEWTON FORBES, OF LAWRENCE COUNTY, DAKOTA TERRITORY.'

ROTARY ENG lNE.

SPE(lIFICA'IITIC'NV forming part of Letters Patent No. 274,476, dated March 27, 1883.

Application filed July 26, 1882.

To all whom it may concern Be it known that I, ISAAC NEWTON FORBES, of Lawrence county, in the Territory of Da lieta, temporarily residing at Washington, in the District of Columbia,have invented a new and Improved Trochilic or Rotary Engine, of which the following is a specication.

The cylinder and casing of my engine are provided with ample induction and eductiou steainpassages through it without interruption, excepting when closed bythe teeth ofthe piston-wheel in their revolutions. It has one main cylinder for the pistou-wheel, two abutment-roller casings, and four valve seats or cylinders. rlhe piston-wheel has four or more piston-teeth upon its surface, standin g an equal distance apart, which revolve in the main cylinder in the track ofthesteam-passage through from the inlet to the exhaust-ports, respectively, and pass by the abutment-rollers in their recesses, which work in connection therewith, the abutment-rollers being geared at each end to the main shaft, and are driven by it so asv to rotate in unison therewith without slip between their peripheries and the periphery ot' They may he of the same diameter as the piston-wheel, it' preferred, or one-half oi that diameter, as shown. The valves are fourfold, and automatcorY self-adjusting in becoming steam-tight, and in allowing for contraction and expansion of the enginewithout binding or leaking, and they are reversible, being connected with the reversing-gear, which, when moved for the purpose, reverses the. valves and-the current ot' steam or other motor fluid tothe opposite pair of valves for the induction or eduction of steam, as the case may be, and so reversing the mo- The heads are cast hollow for the reception of oil or other luhricant,ai1d contain all the bearings for the engine proper. The outer covers are secured to the heads,

tormin g cnsings or housings for the main gear-- of connected waterpipes for the purpose ot' enabling the condensation ot' exhaust-steam, thus assisting the head-pressure to the extent ot' condensation. The heat from theexhaust` (No model.)

steam may be thus utilized, and the base, including the pipes, may become aheater, if required.

To enable a better understanding ot' this engine, I will proceed to describe it with reference to the accompanying d rawin gs, in which- Figure l.l is a vertical longitudinal central section of an engine complete, mounted upon its base, with governor attached. Fig. 2 is in part a central transverse view and in part a full view of the cylinder and casing, with pistonwheel, abutment-rollers, an d valves in position. Fig. 3 is a view ot' the end ot' the valve-stem broken,showing the method oi' securingit to the reversing-gear, and the gear included i n section. Fig. et is an end'view of Fig. 3 with the nut removed. Fig. 5 is a detached longitudinal viewot' the piston-wheel, abutment-rollers, and helical gear in their positions as when in their respective cylinders. Fig. 5 is a section of an abutment-roller through the recesses 9, showingeud plates, Qn, and their packing-rings 26a. Fig. Gis aface view oi the helical gear. Fig. 7 is a central longitudinal section ofthe main shaft, bearing in the end head, and a portion oi' the head with all appurtenances enlarged. Fig. 8 is a bot-toniview vot' a packing-ring, showing the springs in position and one ofthe stops. Fig. 9 is a broken sectional portion of the packing-ring, showing the spring in position.` Fig. 10 is a view. partly in section, of a piece ofthe ring, showing the stop for holding the ring from turning. Fig. 1l is a perspective view of part of the ring S, showing the packingcreases on the outer surface. Fig. 12 is au out-side view ot the adjusting screw-holt in a portion ot' the head. Fig. 13 is a toothed or ratchet ring, in which the toothed part ot' the adjusting screw-bolt 7 tits to prevent the latter from unscrewing. Fig. le is an outside view of the head ofthe cylinder with the reversing valve-gear attached. Fig. l5 is an outer View of the cover or casing for the cylinderhead or thevengine next to the pulley.

Keyed on a shaft., l, is a piston-wheel, 2, constructed with four teeth, 3, at dia-nietricallyopposite parts and at right angles to each other, and extending nearly the length of the cylinder, on the inner surface of which cylininder the said teeth are made to work steamtight by packing-strips 5, pressed outward by springs 5t.

Two abutment-rollers, 6, are arranged opposite each other and at opposite sides of the piston-wheel?, and connected by helical gearing 168 169, so as to rotate in unison therewith without any slip between theirperiphcries, forming steam-tight joints.' The abutment-rollers 6 are, as in the present illustration, of onehalfthe diameter rrof the pistonwheel, and are each provided with two recesses, 9, to permit the passage of the four teeth 3 of the piston -wheel 2. The peripheries of the abutment-rollers and of the piston-wheel are grooved with water-cuts upon their entire surfaces longitudinally, as shown in Figs. 2 and 5, assisting in preventing the passage of steam between theirjoints.

Four oscillating valves, 10 10 102L 10a, each of which is fourfold and similar in construction, are arranged in opposite pairs, one pair of valves, (10 10, for example,) which are opposite each other, being atone time steam-induction valves, while the other pair (10 10a, for example) are for exhaust, the `said valves being employed to place either pair of steamports (11,for example) in connection with the live-steam passages 12 and the other pair'of ports (11, for example) in connection with the exhaust-passages 20. The valves remain at rest during the continuous operation of the engine, being only used for stopping, starting, or reversing the motion. For this purpose a partial rotation is imparted to them all sim ultaneously by a reversing-lever, 19, through the medium of a rock-shaft, 18, carrying a' segment-pinion, 17, gearing with a cogged segnient, 16, on the ring l5, from which project toothed segment-gear, onefor each valve, gearing with pinions 13 on the stems of the valves 10 1U and 10ib 10, as more fully set forth in another application filed byme of even date herewith, designated Case C. The lever 19 differs from lthat in the application referred to in the construction of each end, which is coniposed of two main parts, that which is secured to the rock-shaft 18 and the movable handle in connection therewith, in the present case 19a,

being fixed to the rigid'portion of the rock- -shaft 18,aud bored out for the endof the lever 19 to play in. In the end of the bore, beneath the shank of thelever, is a coil-spring, which throws the catch -pin riveted to the shank of the handle 19 in and out of gear with notches in the rack or bail19b by the downward pressure ofthe hand on the end of the handle. rIhe outer end of the handle lis bored out for the of the handle a tapered hole is bored transversely through the handle, and the cord, passing therein, is, held by the recessedplug driven in alongside of it. v

Vpered stems of the valves 10 10 10a 10a by pins 301, Figs. 3 and 4, and a cap-nut, 302, locked by a flexible disk or washer, 303,. Before the nut is applied the washer 303 is punched down Ainto holes 301, formed in the hub of the pinion, and after the nut is screwedhome one or more portions of said washer are turned up against the recess in said nut, as shown in Fig. 3. i v Y rJlhe supply-pipe 12 and steam-passages 12a are preferably located, as shown, in the center of the cylinder-casing `at, between the heads thereof, and likewise the exhaust-passages 20 and outlet 20?; but the supply-pipe 12 may be nearer one end than the other, if desired. Recesses'llb extend to the rear of thesteam-ports 11 and 11a, wit-hin the cylinder, to permit the inlet-steam to pass the ends of the teeth 3, and so behind themas soon as they cover the inletports. The main shaft-bearings within the heads are formed in segments 48, with Babbitt metal on their faces; or they may be composed entirely of any'other suitable metal,which may be rebabbitted or replaced by new ones when desired. They have inclined projections on their backs extending through mortises in a case or bearing,.49,inw hich1the assembled bearing-segments are held in their positionsfor being set up to the shaft as they wear. The bearing-case or housing 49 is surrounded by a movable ring or cylinder, 50, having inclined surfaces corresponding with the inclined projections on the backs of the bearin g-segments. The ring or cylinder 50 is drawn endwise to force in the bearing-segments by screw-bolts 7 7, screwing into the ilangeS of the ring. The bolts are turned by means of a key or wrench inserted through the apertures 201 (shown in spending' apertures, 20c, being provided in the external cover of the cylinder-head. To hold lar flange, 21, toothed or serrated on its inner face, and a toothed or serrated disk,22, which is prevented froiniturning with the bolt 7 by f1 xed feathered keys or pins 32, passing th rough holes 31,(see Fig. 13,) and, permitting a longitudinal but not a rotary movement, is pressed outward by a spiral spring into engagement with the fixed disk or flange 21 on the screwbolt 7. Longitudinal pins 34 pass through which movein the annular recess 33 when the bolt is turned, which serve to press the disk ilange 21 when pressed inward by the key or wrench. The screw-bolts 7 7 are kept in place by rings 30,.fastened tothe outer surface of the bearing-case by screws or rivets. The main shell of .the head, in which the bearing-case or housing and the adjustable ring are fitted, has

an annular chamber,24f, extending completely around the bearing, which also communicates The segment-pinions 13 are fixed on the ta-` the bolt 7 againstunscrewing, it has an annu.

holes in the toothed flange 21, and have heads.

22 outof engagement with the teeth on thel IOS Figs. 1 and '6) in the gear-wheel 168, correi I IIS IVO

with the remaining chambers through cored channels, (described more fully in another application of even date herewith, designated Case D,) forming one main reservir. R- cesses for oil are also formed between the shell and the housing of the bearing-segments, as shown at 25 in Figs. land 7. For packing the joint between the cylinder-heads and the rims or ends ofthe piston-wheel 2, a ring, 26,l

is employed at each rim, as shown in section `at 26 in Fig. 7, and in under view in Fig. 8.,

and in detailed broken parts in Figs. 9,10, and' 11. The said ring is pressed out by semi-elliptical springs 27,.and is formed with a number of waterfliiacking creases, 28, on its face, as shown in Fig. 1l. To secure the said packingring against turning in the head, lugs 29 are employed, fitting in corresponding recesses,

'one ot' which is shown at 29"", Fig. 8, and fast-- eneil to the head by screws or rivets.

The recessed abutment'rollers are provided with end plates, 9, covering the ends of the abutment-roller recesses, for forming tight joints and preventing leakage of steam between the ends of the abutment-rollers and the plates and between the ends ot' the teeth and the plates, and in connection with packing-rings similar in construction to those hereinbei'ore described, andv shown in enlarged views 7 to 1l, inclusive, but made ot' a-breadth and size to tit the end plates, 9, of the abutment-rollers.

The hollow base upon which the engine stands, and to which it is bolted, contains a series ot' connected pipes, through which cold water is forced and around which the exhaast-steam ilows in its passage to the exhaust pipe 20d. l

The engine is provided with a governor of any approved construction, a com mou form of which is illustrated in Fig. 1. The outer bearing of this horizontaldriving-shaft 37is mount' ed in a novel mannerin a bracket or standard onthe end ot' the cylinder-head cover, snpported by a brace, 35, extending to the top ot the cylinder. The said standard and brace may be made in one or more pieces, as may be preferred. The shaft is driven by a pulley, 38, rotated by a belt from the main shaft 1. Cylinder-cocks l2" are inserted in the lower portion ot' the cylinder-heads, both connected with the annularchamber in which the pistonteeth revolve, for the purpose of carrying ott' the water ot condensation, all of which is more fully described in another application for patent tiled by me, of even date herewith, designated Gase A.)

Having thus described my invention, what I claim as new,` and desire to secure by Letters Patent, is

1. A single reversible trochilic or rotary engine having one main cylinder or engine-casing containing one piston-wheel cylinder, two abutment-roller casings, and four valve-seats, with suitable induction and @duction steam passages, ports, and channels, and a. pistonwheel, two abutment-rollers, and four valves, substantially as and for the purpose set forth.

2. In a rotary engine, the combination ot' cylinder-heads provided with packing-rings, and abutment-rollers provided with removable plate 9a on its ends, to form packing-joints between the said packing-rings and rollers and surface-bearings for the ends of the pistonteeth, substantially as set forth.

3. A trochilic or rotary engine consisting of a main engine casing, a piston wheel, two abutment-rollers, recessed as described, with four reversing-valves, and gear at one or both ends of the engine, two heads, two covers for the heads, and a main shaft, substantially as and for the purpose specified.

4. In a rotary engine, adiustable bolts, with serrated dan ge 21 and serrated ring 22, stops 32, ring 30 for holding the bolts in position, spring to hold the serrated ringin contact, and headed pins Bet, in combination with ring and hearing-pieces 48, as and for the purpose set forth.

cepton of springs 27, with stops 29, substanstealn-tigh t, as described.

7. Thecombiuation cfa tooth ed piston-w heel, two abutment-rollers on opposite sides of said wheel, recessed for the passage of the teeth thereof, and helical gears at each end, connect- IOO ing the shaft of the` piston-wheel and the abutn1entrollers, substantially as and for the purposes set forth.

I. N. FORBES. In presence of- ERNEST ABSHAGEN, FRED. L. FOSTER.

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