US400021A - venables - Google Patents

Description

{No.Model.) 2 Sheets-Sheet 1.v

J. H. VENABLES & J. HUGHES.

ROTARY ENGINE.

No. 400,021. I Patented Mar. 19, 1889..

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ROTARY ENGINE. No. 400,021. Patented Mar. 19, 1889.

UNITED STATES PATENT OFFICE.

JOHN HAMSON vENAnLEs AND JOSEPH HUGHES, OE TORONTO, ONTARIO, CANADA, ASSIGNORS or ONE-THIRD 'ro SAMUEL eoxoN, or SAME lliA CE.

ROTARY ENGINE.

SPECIFICATION forming part of Letters Patent No. 400,021, dated March 19, 1889.

Application filed May 3, 1888- $erial No. 272,669. (No model.)

To all whom it may concern:

Be it known that we, JOHN HAMsON VENA- BLES and JOSEPH HUGHES, both engineers, and both of the city of Toronto,in the county of York, in the Province of Ontario, Canada, have jointly invented a certain new and useful Improvement in Rotary Engines, of which the following is a specification.

The object of the invention is to design a reversible rotary engine in which the steam may be cut off at any desired point of the revolution and the expansive power of the steam utilized; and it consists in the peculiar combinations and the construction, arrangement, and adaptation of parts, all as more fully hereinafter described and claimed.

Figure 1 is a perspective Outside view of our improved rotary engine. Fig. 2 is a sectional side view showing the interior construction of the rotary-engine cylinder.

For the purpose of illustrating our invention we have chosen an ordinary link-motion valve-gear; but it will of course be understood that any class of valve or valves may be applied.

In the drawings, A represents the main steam-pipe leading from the boiler and connecting with the valve-chest B. G is a steamport leading from the valve-chest B to one side of the cylinder D, and E is a similar steam-port leading from the valve-chest B and entering the other side of the cylinder D immediately opposite to the point where the port 0 enters.

F is a link supported on the spindle of the valve and connected to the driving-shaft G .by the rods ll and eccentrics Las shown. \V e show two eccentrics and two rods, although our engine will operate with one eccentric and one rod, for the reason we will explain further on.

Each of the stean'i-ports O and E is provided with a cut-otf valve operated by the le vers J, which levers are connected to the link F, as indicated in Fig. 1.

It is of coursenot necessary to connect the levers which operate the cut-off valves with the link, as the link and the valves may each be operated by an independel'lt lever.

K is a cylinder connected to and forming part of the cylinder D, so that the circle of the inner circumference of one cylinder intersects and extends into the circle of the inner circumference of the other cylinder. Consequently the piston which follows the inner circurnference of one cylinder will extend into the other cylinder when passing the space connecting the two cylinders.

L is a piston, substantially egg-shaped and fixed to the driving-shaft G, and formed so that its greatest diameter extends to and is fitted against the inner circumference of the cylinder D.

M is a-two-winged cam fixed to a spindle, N, suitably journaled in the cylinder K, and having fixed to its outer end a handle, 0. The outer circumference of this two-winged cam M fits the inner circumference of the cylinder K, and the two wings are connected together by a curved bridge, l, which fits against the block Q, extending into and forming part ofthe cylinder K.

Adjustable plates operated by springs or steam may be placed at the points of contact between the piston L and the cylinder D and the two-winged cam M and its cylinder K, and between the bridge P and its block Q; but as there is no appreciable friction at these points the wear will be very slight. Each end of the cylinders D and K is closed by a cover, R,'Securely bolted to flanges formed on the said cylinders. Adjustable plates operated by springs or steam are placed on the inner surface of each cover R to press against and form steam-tight joints with the piston L, cam M, and curved bridge P.

As adjustable packing of the description we use is employed in other rotary engines, it is not necessary for us to illustrate its construction in this specification. There are two exhaust-ports, S, extending from the cylinder K, opposite to each other, as shown, and each exhaust-port S is provided with a cut-off valve operated by a handle, T. Two steam-pipes, U, extend into the cylinder K on either side of the block Q. These steam-pipes U are either provided with cut-off valves or are so connected to the Steam-ports C and E that steam will be only admitted through one of them at a time.

Having described the general construction ol. our improved rotary engine, we shall now explain briefly its operation.

it will be noticed on reference tol ig. 2 that the portion of illOpiSiIOlt L which fits against the cireumlereime of the cylinder K has just passed the steam-port C. The valve in this Sli()ldil[10i'ii is assumed to be open and the exhaustport on the same side is closed, while the steznn-port E is closed and the exhaustport on the same side open. The steam-pipe on the right-hand side of Fig. 2 is open, and the steam-pipe l' on the opposite side of the block Q closed. The pressure of the steam admitted through the open steampipe if, acting against the baelc of the wing of the cam M, which presses against the eantshaped piston 'L, holds the said wing against the said piston with suiileient force to form a steam-tight joint between the two, and the steam admitted through the open steam-port E forces the piston L to travel in the direction indicated by the arrow until it passes the point where the circles of the cylinders l) and K intersect each other, when the steam will escape through the open exhaustportb, and the piston L must then continue to travel by the force of its own momentum until it once more reaches the open steamport. lly adopting a cut-oil? valve operated by eccentrics, as described, the steam may be cut oit from the open steam-port at any doslred point, when, of course, the expansive force of the steam will be utilized for propeli ling the revolving piston L. Inorder to reverse the engine, it is merely neeessaryto shift the link ll, turn the two-winged c am M so as to bring the opposite cam into contact with the piston L, close the ports which were previously open, and open those which were previtnisly closed, when the piston l) will be caused to immediately revolve in the opposite direction. As the steanrports C and E enter the cylin' der K exactly opposite to each other, the rela tive position of the piston ii to each steamport will be the same. (,onsequently a single eccentric will be sufficient to operate the valve to propel the piston in either direction.

It will be understood that two cylinders may be coupled together and arranged so that the piston of one will be takin steam during the period that the piston of the other cylinder is passing over the dead-center.

\Vhat we claim as our invention isl. The cylinder D, provided with steamports, and the cylinder K, connected to and 'formin part of said cylinder I), substantially as described, and provided with exhaust-ports, and the block Q, combined with the piston L, the two-winged cam fitting the cylinder K, and having a curved connection between the wings fitting under the block Q, and a bandle to said cam connected with the valves to said exhaust-ports, substantially as described.

2. A piston, L, carried on the shaft G, within the cylinder 1), against the inner surface of which it fits, the steam-ports E, entering the cylinder D immediately opposite to each other, as shown, in combination with the two-winged cam M, fitting the cylinder K and carried on the spindle N, the exhaust-ports S, entering the cylinder K immediately opposite to each other, the curved bridge 1, connecting togetlier the two wings of the cam M and :litting against the block Q, and the steam-pipes l arranged substantially as and for the purpose specified.

Toronto, April 26, 188$.

JOHN IIAMSON VICNABLES. JOSEPH. l l'llGl IES.

in presence ol' (ti-marine; U. BALDWIN, l .13. Fn'rrmnsinmanual.

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