US461830A - Governor for steam-engines - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1. W. A. GRAHAM.

GOVBRNOR POR STEAM ENGINES.

No. 461,83o. Patented Oct. 27, 1891.

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GOVERNOR FOR STEAM ENGINES.

Patented Oct. 27, 1891.

UNITED STATES PATENT OFFICE.

WILLIAM A. GRAHAM, OF CRLISLE, PENNSYLVANIA.

GOVERNOR FOR STEAM-ENGINES.

N SPECIFICATION forming part of Letters'Patent No. 461,&30, dated October 27, 189 1. I Application filed April 4.1891. Serial No.387,647. (No model.)

To all whom, 't may concernr Be it known that I, WILLIAM A. GRAHAM, of Carlisle, in the County of'Cumberland and State of Pennsylvania, have invented certain new and useful Improvements in Governors for Steam-Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in speed-governors for steam-engines; and it consists in certain novel features of construction and combinations of parts, as will be hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure lis a side elevation of an engine, showing improved speed-governor. Fig. 2 is an end elevation taken at right angles to the view shown in Fig. 1, and Fig. 3 is a detail.

A represents a main shaft, to which a pulley 21 is keyed. Inside of this pulley two diametrical tracks 22 22 are Secured on opposite sides of the hub of the pulley, and centrifugal weights 23 23 are loosely mounted on these tracks, whereon they are adapted to slide freely as the pulley rotates. Screws 25 25 are set at the inner ends of these tracks after the weights have been placed on them to prevent their coming off, and the weights are drawn normally toward the center of the pulley or against these screws by the following means: A cone 26 is keyed on the outer end of the shaft 20, so as to slide freely thereon, but not rock, and this cone is preferably provided with -a fiange 27. Short cables. 28 28 extend from this fiange to the weights, their ends being Secured to these respective parts by small set-screws 29 29, as shown, and being passed over pulleys 30 30 about midway between their ends. These cables are held normally taut, the cone normally outward, and the centrifugal weights normally inward by the tension of a stiif spiral spring 31, interposed between the cone and the hub of the pulley. As it is important to provide means for regulating the tension of this spring, a

'plate 32 is interposed between the spring 31 and the hub. Screws 33 33 are setin thehub and provided with integral flanges 34 34,

cone is utilized to control the supply of steam by the following means: A plunger 35 is fitted to a small steam-chest 36 on the live-steam port' This chest may be packed, if desired, after the usual manner of stearn-cylinders to prevent the escape of steam. The plunger is provided with a hole 37 of precisely the same diameter as the diameter of the live-steam port, and which register-s with it when the engine is taking the full head of steam, and by means of a lateral opening 38 in the end of the plunger steam enters the end of the chest, and by its impact against the ends of the plunger tends to hold it in position to admit the full head of stean; but this position" is only maintained when this steam-pressure against the end of the plunger is greater than the pull exerted by the weights in their tendency to move outward, and this is comnunicated through the stem 40 of the plunger and the anti-friction roller 41 in its end, which runs in contact with the cone. To prevent any rocking of the plunger, a small screw 42 is set in it, and its end projects into an elongated slot in the side of the plunger, and to guide the plunger-stem a box 43 is provided and Secured to the longer arm 44 of the segment. So, to recapitulate, the steam tends to hold the plunger yieldingly in its normal position, and the weights force it in the opposite direction as they move outward, thus closing the live-steam port more or less, according to the speed of the engine. In this manner the slightest increase or decrease is quickly compensated for, and the resulting motion is uniform and steady.

It is evident that slight changes might be resorted to in the form and arrangement of the several parts described without departing IOO from the spirit and scope of my invention,

;and hence I do not Wish to limit myself to the exact Construction he'ein set fo'th; but,

Having fully described ny invention, What I claim as new, and desire to secure by Letters Patent, isi 1; The conbinttion, with a shaft having a pulley thereo and centrifug tl Weights, of a cone a''anged to slide on the shaft, fiexible connections attached to the cone and Weights, a reciprocating plunger, and a stern arranged to receive endwise motion from the cone, substantially as set fo'th.

2. The combination, With a shaft having EL pulley the'eon, dianetrical tracks formed on L. M. MYERS, C. E. DIEHL.

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