US247685A - purdie - Google Patents

Description

(MedeL) a Sheets-Sheet 1.

I. PURDIE. COMBINE-D THROTTLE AND GOVERNOR. No. 247,685. Patented Sept. 27,1881.

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'Patented' sept. 27, 1881 Modem I. PURDIE.

COMBINED THROTTLE AND. GOVERNOR.

(Model) 3 Sheets-Sheet a. I. PURDIE.

. COMBINED THROTTLE AND GOVERNOR. No. 247,685. Patented Sept. 27.1881.

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i zw'izzil UNITED STATES PATENT OFFICE.

ISRAEL PURDIE, OF NEW YORK, N. Y.

COMBINED THROTTLE AND GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 247,685, dated September 27,1881,

Application filed July 20, 1881. (Model) To all whom it may concern Be it known that I, ISRAEL PURDIE, of the city, county, and State of New York, have invented certain new and useful Improvements in aCombined Throttle and Governor, ofwhich the following is a full, clear, and exact descrip tion, reference being had to the accompanying drawings and the letters marked thereon.

My invention relates especially to that class of steam-governors commonly known as centrifugal, and has for its object the production of a device which not only acts as a governor while the engine to which it is attached is in motion, but also embodies in one and the same mechanism a throttle and governor, together with an improved elastic valve, by which a substantially perfect automatic self-adjusting stop-motion is obtained; and my inventioninvolves certain novel and useful combinations or arrangements of parts and peculiarities of construction and operation, all of which will be hereinafter first fully described, and then pointed out in the claims.

In the drawings, Figure 1 is an elevation of my improved governor, and Fig. 2 is a vertical axial section of the same, showing the interately fit.

rior arrangement of all the parts. Fig. 4 is a plan of the throttle-wheel surmounting the device. Fig. 3 is an elevation of my improved elastic valve, and Fig. 5 is a horizontal central section of the valve-shell and valve-casing.

Fig. 6 is a plan view of the reversing mechan-.

' guide the valve into place and hold the same,

when raised from itsseat, in such manner as to allow free passage of the steam. A small stem, B projects from the top of the lower valve into the hollow stem-B attached to the under side of the upper valve, the two parts being adjustably held in place by means of the spur b, fixed in stem 13, and moving in a slightly-elongated slot, 12, in the hollow stem B Stern B does not extend the entire length of the hollow in B the remaining space therein being occupied by a suitable spiral spring, 0, formed of steel, brass, or any preferred material. The function performed by said spring is that of keepingthe two valves removed as far apart from each other as the pin and slot in their respective stems will permit, so that when the governor ceases to move by reason of the failure of the driving-belt to operate and the valve drops, sufficient space will still be left between valve B and its seat to permit the passage of the requisite amount'of steam to keep the engine moving; but when the steam is cut off by means of the throttle forming a part of my governor the spring is compressed and the valve forced into its seat. At a is a projection upon valve B screw-threaded upon its interior, for the reception of the thin section of spindle D, passing up from .the valve.

The direction taken by the steam through the' valve is indicated by the arrows shown in Fig. 5. It passes from the supply-pipe into the valve-shell at A, thence to the underside of valve B and the upper side of valve B, out

through the ports formed by the valve shell and easing, the parts being held in proper position by fitting steam-tight against the projections' A upon the valve-casing. As explained, when the lower valve is closed down upon its seat by the cessation of the motion of the governor the upper valve will still remain open or raised enough from its seat to admit the requisite quantity of steam to keep the engine in motion until the belt of the governor is again readjusted, or the upper valve closed down by means of the throttle.

E is a metal flange or plate forming the top of the valve-shell, to which it is attached by suitable bolts, O. Said plate is cast together with the column E, supporting the rotary portion of the governor. e is astuffing-box upon flange E, through which the section of spindle D passes. WE are arms cast together with the plate E and column E, forming the support for the latter. Said arms are provided with projections E perforated with a screwthreaded hole for engaging with'bolt g,'passin g through a corresponding projection, E upon jection, E upon each side thereof for eegagin g with arm E the object being to provide for driving the engine in either direction, one of said connections only being in use at a time, in order to permit the operation of the mechanism, as will be hereinafter described.

It is very often necessary to change thedir.

rection in which a governor runs and shift the driving-shaft from one side to the other. In all ordinary governors, as now constructed, this cannot be done, an entirely new governor being required; but by use of my improved mechanism it is only necessary to remove the bolt g, throw the bearing F around to the opposite side of the column E, and pass said bolt through E and E By this arrangement no change in the construction of the governor is necessary in order to render it reversible, as it may be instantly changed so as to swing in either direction, as occasion may require.

G is a toe cast upon the under side of hearing F, said toe projecting between the arms E and 11. when the governor is in motion, and engaging with a step, G, attached to the sleeve H, passing up through column E.

I is a suitable flat spring attached to the under side of bearing F, back of toe G, the free end thereof finding a seat against a suitable point upon base E when in place.

J is a beveled-gear wheel keyed upon shaft F, the same beingheld in place by means of the collar K upon said shaft. The short section of spindle D passes up into sleeve H, and is attached to an enlarged continuation formed by rod D, extending upward to the top of the governor. Rod D is grooved, as at h, said groove engaging with a pin upon the interior of sleeve H.

L is the revolving support for the rotary portions of the governor, composed of cast-iron, and hearing at bottom a beveled-gear wheel, J, for the purpose of engaging with the driving-wheel J. Said wheel J revolves upon shoulder h upon sleeve H.

M M are two balls, partially hollowed out upon their interior, held in place upon support L by means of the bolts 1 securely fixed in said support. Upon the interior of each ball is a flat spiral spring, M secured in place by means of nut m upon the end of bolt M. The ball is formed of two parts, the outer one engaging with screw-threads upon the other for the purpose of easy access to the interior thereof, the same forming a cap for the spring and adding to the symmetrical appearance of the device. A hole or slot, WV, is cut through the shell of each ball, into which projects arm or lever N, said arm being held in place by bolt n, the same being the fulcrum upon which the arm works.

P is a brass socket revolving around a hollow section of brass shaft D and finding a bearing against shoulder D thereon. Shaft D is screw-threaded upon its interior for the purpose of engaging with corresponding screwthreads upon the spindle-rod D. Socket P is provided with notches 12 upon each side, into which pass the ends of arms N.

h is a suitable nut, engaging with screwthreads upon the upper extremity of sleeve H for the purpose of holding the parts in place.

Fixed upon shaft D is a throttle-wheel, R.

.Said wheel is notched upon its upper surface,

the notches R representing various degrees of speed for the engine. Around the periphery of the wheel is located a groove, R,-for the pur pose of holding a suitable cord or round belt when it is desired to move the throttle from a distance.

Spindle-rod D bears a finger, T, held in place by means of the thumb-screw T, pressing against the key T Finger T fits into the notches upon throttle-wheel and serves to indicate the speed of the engine.

When the various parts of my im pro vedcombined throttle and governor are assembled and arranged in accordance with the foregoing description, the operation of the same is as follows: When the driving-belt is placed upon the pulley, toe G will be pressed against step G upon sleeve H, and the revolving portion of the device will be raised thereby and supported in such a position as to permit the pinions J J to engage properly with each other, spring I pressing against its bearing. If by any means the belt is thrown ofi", said spring forces the bearing F, carrying shaft F, to one side, thereby disengaging pinions J J, and the toe G being withdrawn from beneath the step by the same motion, the valve isclosed, with the exception of the slight opening therein before-mentioned,which only allows enough steam to pass to keep the engine in motion until the belt is readjusted. To do this no heavy lifting or waste of time is required, as by simply turning the bearing upon its hinge the governor is in readiness for use. It will thus be seen that my improved device admirably answers the various uses and purposes for which it is intended.

Having now fully described my invention, what I claim as new therein, and desire to secure by Letters Patent, is-- 1. In a combined throttle and governor, the combination, with the elastic valve, of the hearing for the driving-shaft, said bearing being so arranged as to be adjusted to permit the reversal of the motion of the governor, and having a projecting toe attached thereto, adapted and arranged to hold said valve open by pressing against and elevating a step supporting the revolving portion of the mechanism, and

by the withdrawal of which said valve will be 'as shown and described.

2. An elastic valve fitting into a shell her ing projections therein arranged in such manner as to form inlet and outlet ports, said valve consisting of a casing, two separate valves,

with corresponding seats, the valves being provided with radial arms to guide and retain them in proper position, the stem of one valve extending into the hollow stem of the other,

' upon its interior, said projections forming, with the shell and valve-casing, the inlet-ports, casing B, valves B and B stem B hollow stem B radial arms a, slot 12, spur b, and spring I, the whole combined and arranged to operate substantially as set forth.

4. In a steam-governor, a reversible bearing for the driving-gear, having projections upon each side adapted to engage with corresponding projections upon each side of the supporting-column, said bearing being so arranged as to be automatically thrown outof position in either direction, as required, when the pressure of the belt is removed therefrom, allowing the spindle to fall and partially close the elastic valve, substantially as shown and described.

5. In a steam governor, a throttle-wheel grooved upon its periphery, and having notches cut in its uppersurface designed to engage with a finger connected with the spindle, in combination with said spindle and an elastic valve, substantially as shown and described.

6. In a steam-governor, the balls composed of two parts united by means of screw-threads, the inner portion of said balls held in place by a bolt extending from a rotary support, said bolt bearing upon the interior of the ball, a flat conical spiral spring adapted and arranged to regulate the pressure exerted by the balls upon their levers or arms, substantially as shown and described.

7. In a steam-governor of the character herein specified, the rotary support L, balls M, composed of two parts secured together by screwthreads, as shown, bolts M, springs M slots W, and arms N, the whole combined and arranged to operate substantially as shown and described.

In testimony that I claim the foregoing I have hereunto set my hand in the presence of two witnesses.

ISRAEL PURDIE.

Witnesses:

EUGENE N. ELIOT, A. M. PIERCE.

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