US69526A - John n - Google Patents

Description

@auch tatea gattnt @ffice JOHN N. WRIGLEY AND GEORGE SMITH, OF NEWARK, NEW JERSEY. ASSIGNORS TO JOHN N. WRIGLEY, OF THE SAME PLACE.

Letters Patent No. 69,526, dated October 1, 1867.

IMPROVEMENT IN CUT-OIT VALVE-GEAR.

TO ALL WI-IOM IT MAY CONOERN:

Be vit known that we, Jenn N. WRIGLEY and Gnonen SMITH, of Newark, in the county ot Essex, and State of New Jersey, have invented a new and improved Steam-Valve and Valve Movement; and we do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming'a part of this specification. I

This invention relates to a new and improved methodvof admitting steam to the cylinder of a steam engine, and it consists in vthe arrangement and operation of the cams on the wheel, the adjustable har, the bell-crank, and connecting-rod m, as will be hereinafter more particularly described.

Figui-, I' represents a side elevation of the valve-chest and the parts by which it is operated, with the governor in red lines.

Fig-ure 2 is a sectional detailedi view of the valve-chest, with the valve in place, showing the internal *chamber and the ingress and egress apertures. Y

Similar letters of reference indicate corresponding parts.`

Arepresents the valve-chest, B the valve. C is an internal chamber cast within the chest, within which the valve is operated. The valve is double, having two seats in the chamber C., as seen in the drawing. It.will be seen that the valve is balanced, or nearly so, when in its seat, as the steam presses upon both sides, `hilt the upper valve being greater in area than the lower one, the tendency of the steam pressure is to keep it closed, but this difference in area may be very slight, so that the valve may be operated with perfect ease. The steam enters the chamber of the chest at D, and is discharged therefrom through section of a pipe marked E. F represents the valve-rod or spindle. To this is attached a bent lever, G, which has its fulcrum on a stand, f, after the manner of an ordinary safety-valve, but instead of a weight, the lever has a spiral spring, a, attached to it and to the flange of the pipe as seen in the drawing. This is for the purpose of securing a. quick closing of the valve. The valve is operated by gear-wheels, which are driven by the engine. H is the one through which the vulve is raised, upon the outer surface of which there are two cams, d d, firmly attached to the wheel. The cogs on the opposite side of this wheel are seen in dotted lines. A portion of the driving pinion-wheel is also seen in red. J is a hell-crank which is attached to and turns with a stud, z', and K is an upright bar, which is attached to the outer end of the bell-crank J, and it is connected with bent lever G bythe rod L. The rod L passes through the bar K, and-is adjustable on it. The other end of the bell-crank J is connected with the same lever Gr by the rod m. The end of this rod m is slotted, so as to make it adjustablefend it is fastened and kept in place by a thumb-screw, n. By adjusting the rod m, by this slot, on the lever G, the valve may be made to open, more or less, as the position of the upright bar-K is governed in part thereby. The cams d d, on the wheel I-I, may be made adjustable, so as to give the bar more or less throw.

It will be seen that the upper endof this bar is inclined towards the cams, and that as lthe bar is raised the cams will move it outwardly less than they do when it is lowered. In this way the valve is made a variable cut-off valve, and may be thereby set so as to discharge more or less steam, as circumstances may require.

An arrangement (in red lines) is shown by which the governor of the engine is made to control the position of the bar K, thus making it self-adjusting. In this case the set-screwa is loosened, so that the rod may play freely on the wrist at o.

It will be seenthat by this general arrangement, and with the balanced valve operating as described, all extra cut-off plates or valves are rendered unnecessary, thus lcssening the expense and greatly improving the action of the steam engine, by rendering the motion steady and uniform under all circumstances.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-

The cams d d on the wheel H, the adjustable bar K, the bell-crank J, and the rod m, arranged and operating substantially as described for the purposes set forth.

JOHN N. WRIGLEY,

GEORGE SMITH.

Witnesses:

WM. F. McNAMAnA, ALEX. F. ROBERTS.

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