US434252A - ceeelman - Google Patents

Description

(No Model.) Y 2 sheets- Sheen "1 W. J. CRBELMN. Y

A STEAMBNGINE GOVERNOR; No. 434,252. Patented Aug. 12, 1890.

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)VILLIAM J. OREELMAN, OF ROCHESTER, NEW YORK, ASSIGN OR TO 'THE WOODBURY ENGINE COMPANY, OF SAME PLACE.

STEAM-ENGINE GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 434,252, dated August 12, 1890.

Application filed February 7, 1890. Serial No. 339,518. (No model.)

To @ZZ whom it may concern.-

Be it known that I, WILLIAM J. CREELMAN, of Rochester, in the county of Monroe and State of New York, have invented a new and useful Improvement in Steam-Engine Governors,which improvement is fully set forth in the following specification, and shown in the accompanying drawings.

My invention relates to wheel-governors for steam-engines or that class of centrifugal governors in which a vibratory or swinging eccentric is secured to a wheel of the engine, the eccentric being controlled by weights and springs.

The invention consists in providing certain improved parts and devices for the purpose of overcoming various difficulties heretofore encountered in engine-governors and to otherwise improve the construction of the governor, the features of novelty being heref inafter fully described, and more particularly pointed out in the claims.

Referring to the drawings, Figure 1 is a side elevation of my improved governor attached to the iiy-wheel of an engine, parts being sectioned on planes parallel with the plane of the wheel, parts being broken away; Fig. 2, a view of the same, (seen as indicated by arrow w in Fig. 1,) the wheel'with some other parts being sectioned as on the dotted line y y in Fig. 1. Fig. 3 (sectioned on the dotted line .e in Fig. 1) shows the knife-edge bearing of the spring; Fig. 4, a view of the part-s shown in Fig. 3, parts being sectioned on the dotted line rr fr; Fig. 5, a view of the parts, (seen as indicated by arrow in Fig. 4.,) the section being on the dotted line y y', Fig. 6, a plan of the adjustable holder for the spring; Fig. 7, a transverse section taken on the dotted line in Fig. 6; Fig. 8, an edge View of the auxiliary weight, (seen as indicated by arrow z in Fig. 1;) and Fig-9, a plan of the outer louer for thepauxiliary weight, the arm of the wheel being sectioned, as on the dotted line a2 in Fig. 1. The gures on Sheet 2 are all drawn to larger scales than the scale of the figures of Sheet 1.

Referring to the parts, A, Figs. 1 and 2, is the inertia-wheel or other wheel of a steam- 5oengine, to which my improved governor is attached, and B the crank-shaft. The eccentric-hub or eccentric O is held to turn upon a pin D, rigid in an arm of the wheel, the plane of the eccentric proper being parallel with the plane of the wheel, and all movements of the eccentric being parallel with said plane of the wheel. Y

E is a main centrifugal weight secured rigidly to the eccentric by a bolt a.

F is an auxiliary centrifugal weight con- 6o nected with the eccentric on the other side by means of a lever b and link c, the lever being pivoted upon a stud d, rigid in a projection e from an arm of the wheel.

G is a tension-spring connected at H with 6 the eccentric in a manner to act upon the latter contrary to that of the action of the weights, the axis of the spring being in the plane of the wheel. The outer end of the spring is connected with the wheel'by means 7oV of an adjustable rest or holder g, secured to the rim by screws f f. These screws pass through longitudinal slots h h in the holder g and enter the wheel, by means of which slots said holder is rendered longitudinally adjustable along the rim of the wheel. A curved projecting seat c' for the holder g is formed on the rim of the wheel, it being eccentric with said wheel and preferably about concentric with the bearing at H. This form 8o is given `the seat mainly foi1 the purpose of avoiding any material change in the spring as to tension when the adjustments of the holder are made. The adjustments of the holder are in the plane of the wheel and cause 8 5 the spring to move sidewise in said plane. These adjustments of the spring cause the angle formed by the axis of the spring extended and a line drawn through the axis of the pin D and the axis of the joint l-I to be 9o more or less acute, according to the direction of the adjustment in any given case'. For instance, should the adjustment be in an upward direction, (referring to Fig. 1,) this angle would become more acute, giving to the weights an advantage over the spring in their action upon the eccentric; or, should the adjustment be in the other direction, the angle would approach a right angle, giving the spring an advantage over the weights.

As the weights move outward at any time on account of an 4increase in the speed of the IOO engine, their centrifugal force and intensity of action upon the eccentric increase, and as the spring is drawn out from the action of the weights it likewise acts more powerfully upon the eccentric against the weights. New the aim in constructing governors of this class is to have the increase of the force of the spring keep pace as nearly as possible with the increase of the force of the weights, to the end that the variations of the speed of the engine running under varying loads or varying steam-pressure shall be as little as possible on the one hand and that the engine shall not pulsate or race on the other. This constant balance between the force of the spring and the force of the weights, I iind can be much more satisfactorilyeffeeted by directly connecting the eccentric with the wheel by means of aspring, and provide an adjustment for the latter to change its direction of pull upon the eccentric.

Owing to a lack of uniformity of elastic force in springs of the same size no one position for a spring relative with the eccentric with equal tension is correct for all. I design to give the spring in each case sufficient tension for the requirements of the governor and to secure the required degree of sensitiveness for the governor by the sidewise adjustment of the spring above described'. The spring is connected at one end with the eccentric and at the other with the rim of the wheel by mea-ns of head pieces or heads k l, respectively, the former being shown in detail in Figs. 8, 4, and 5. These heads are each formed with spiral grooves n, in which the turns of the spring at its respective ends rest. A threaded stem o, entering the head l, connects the spring with the holder g by passing through an opening p in a raised part of the helder, Figs. 6 and 7. By means of this threaded stem the spring is rendered adjustable as to its tension or the intensity of its pull upon the eccentric. The opening p is circular at the bottom, but made Haring or elongated in two opposite directions at the top, the elongation being in the direction of the plane of the wheel, as shown. This tiaring form of the opening allows the spring to swing freely in the direction of the plane of the wheel, while the parallel or straight sides u u of the opening prevent the spring from swinging in a direction transverse to said plane. This restricted motion of the spring is mainlyfor the purpose of guarding against accident. Should the spring break or become detached from the eccentric at any time while the wheel is in motion, it can only sway backward and forward in the plane of the wheel, which motions would be harmless. If the spring were permitted to swing outward at either side of the wheel serious damage might be done.v The stem is formed with a rocking head r under the holder to keep it in place. The surface of this head in contact with the holder is eonvexed or ridged, as shown in Figs. l and 7, so as to rock as the spring moves one way orthe other on account of the motions of the eccentric or the adjustments of the holder g. The inner head 7c of the spring is formed substantially eylindrical at its upper end and hollow, as shown in Figs. 3, 4, and 5, the axis of the opening being at rightangles to the axis of the spring. This open head surrounds the stud H, which is rigid with the eccentric. The stud is provided with a knife-edge piece s,seated longitudinally therein, preferably made of hardened steel, and the. opposing surface of the head is provided with a hardened-steel bart to meet or bear upon the knife-edge. This construction renders the friction between the two parts of this important joint substantially nominal and adds much to the sensitiveness of the eccentric acting under the control of the centrifugal weights. The stress upon the spring is constant and always in the same direction,which causes the knife-edge to always bear against its companion piece t.

The lever I?, Figs. l and 2, is formed with a projecting part 'u at its outer end to prevent the weight F from slipping off should said weight at any time become loosened. The weight is made with a diametrical opening w through it suflieiently large to be passed over the projection o, the weight being adj ustable upon the lever and secured to the latter by a detent-screw a. b is a cushioned stop or buffer for the weight when in its extreme outer position. This stop is made rigid with an arm of the wwheel by means of a bolt c and is faced with a rubber cushion cl to receive the weight. e is a cushioned stop for the weight when at itsinnermost position. This stop, which may he solid or tubular, is preferably threaded into the hub f of the wheel and provided with a set-nut g', by means of which it may be longitudinally or endwisc adjusted. The rubber cushion h to receive the weight is inserted in a cavity in the outer end of the stop, as shown.

The auxiliary weight F is formed with straight tangential parts t' t', parallel with a central longitudinal line of the lever, so as to fairly meet the stops b and c in any position to which the weight may be adjusted upon said lever. These straight parts or sides of the weight, acting conjointly with the respective stops, are important and constitute a inaterial part of my invention.

The hub f of the wheel is formed with a tongue 7s', projecting radially outward parallel with the arm of the wheel, to aid in firmly supporting the pin D for the eccentric. The latter is divided, as shown in Fig. 2, to slip over the end of the tongue, which prevents any longitudinal motion of the eccentric upon said pin during the operation of the governor.

The part Z of the eccentric is depressed, so that the studs H n shall clear the eccentricstrap I, Fig. 2. A similar and corresponding depressed part r is formed at the other side of the eccentric at which the spring and thc IOO IIO

lever b are connected when the engine is intended to`be run in the other direction, and the eccentric-hub is also formed with an opposing seat o for the main Weight E. A stud p is inserted in one of the holes in the part fr and provided withy an india-rubber ring s',

`Fig. 2, which constitutes a stop or buer for the eccentric when swung to its position of greatest eccentricity. This stop encounters the hub of the Wheel, a concaved recess t being formed therein to give the rubber ring a greater breadth of bearing. This stop for the eccentric acts conjointly with the stop e', above described, to arrest the outward motion of the eccentric. The stop e being adjustable, it may be set to act simultaneously with the stop p.

What I claim as my inventionisl. Amovable eccentric on arevolving wheel, in combination with an operating centrifugal weight rigid With said. eccentric, an adjustable auxiliary centrifugal Weight to move the eccentric, a lever to hold the auxiliary Weight, a link connecting said lever and the eccentric, and a spring to connect the eccentric with the wheel, substantially as shown.

2. An eccentric secured movably to a Wheel, in combination with centrifugal Weights to operate the eccentric, one rigid with the eccentric and the other connected therewith by a movable link, and a spring to control the eccentric having a bearing at its inner end upon a part rigid with the eccentric and at its outer end secured to the Wheel and adjustable along a continuous concave seat eccentric With the Wheel, substantially as shown.

3. A movable eccentric mounted upon a revolving Wheel, in combination with centrifugal Weights to move the eccentric, a spring to move the eccentric, a stud rigid with the eccentric, an open circular head for the spring to encircle the stud, the latter being provided with a hardened knife-edge piece separate from the stud and embedded in its convex surface and projecting therefrom, and the open head provided With a separate hardened piece embedded in its concave surface, said hardened pieces being in contact, substantially as shown, and for the purpose set forth.

4. An eccentric secured movably to a revolving Wheel, in combination with centrifugal weights to move the eccentric, a spring to act upon said eccentric against the Weights, an adjustable holder for the spring secured to the Wheel, and a curved seat on the Wheel for the holder.

5. An eccentric secured movably to a revolving Wheel, in combination With centrifugal Weights to move said eccentric, a spring to act upon the eccentric contrary to the Weights, and a detachable holder for the spring p secured to the wheel.

6. A pivotal eccentric on arevolving Wheel,

and adjustable with reference to the angle formed by said axis and a line drawn through the center of motion of the eccentric and the joint between the eccentric and spring.

7. An eccentric secured movably to a rel volving Wheel, in combination with centrifugal Weights to operate said eccentric, a spring to act upon the eccentric contrary to the Weights, a holder for the spring secured to the wheel, and a stem connecting the spring and holder occupying an oblong opening in the holder having its longest dimensionv in the plane of the Wheel, and a rocking head for the stem to bear against said holder.

In witness whereof I have hereunto set my hand, this 1st day of February, 1890, in the presence of two subscribing Witnesses.

WILLIAM J OREELMAN. Witnesses:

E. B. WHITMORE, M. L. McDERMo'rr.

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