US288699A - John eeicsson - Google Patents

Description

(No Model.) A l J. ERIGSSGN.

SPEED REGULATOR. Y `1-I .2'a8,6-99. Patented Nov. 201883.

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JOIIN ERICSSON, OFNEW YORK, N. Y.

SPEED-REGULATOR.

SPECIFICATION forming part of Letters Patent No. 288,699, dated November 20, 1,883.

Appncann fned April 11, 1883. (No model.)

To @ZZ whom t may concern,.-

Be it known that I, JOHN ERICSSON, of th city and county of New York,and State of New York, have invented a new and Improved Speed-Regulator for Engines, of which the following is a speciiication, reference4 being had to the accompanying drawings. The object of my invention is ,to attain in steam-engines running at avery high velocity a degree of accuracy of regulation not attainable by the speed-regulators in common use. In order to obtain in the highest degree the sensitiveness requisite in a speed-regulator to accomplish theabove result, it is necessarythat the operation of the regulator be effected with the least possible movement in its bearings relatively to each other, and of its connections or means of communication with the regulating-valve, and .that the friction of all its parts and connections be reduced to a minimum.

My invention consists, essentially, in anovel combination and arrangement of a centrifugally-operating lever and a counterbalancingv spring, and anovel system of connections or means of communication between the said lever and the regulatingvalve, whereby the requisite reduction of the movement in the bearings and their friction and consequent sensitiveness are obtained.

Figure l in the drawings exhibits a view of my speed-regulator taken in a plane par allel with its axis, and showing its casing or i carrier in section, and represents also a section of the steam-pipe-and the regulatingvalveto which the speed-regulator is applied. Fig. 2` is a face view of a secondary lever through which the centrifugallyoperating lever acts upon the valve.

A is what may be termed the carrierH of the speed-regulator, to which all of its rotating parts are attached, and which I prefer to attach directly to the shaft B of the engine to be regulated, though it might be attached to another shaft deriving motion from the engine. The carrier A might consist of a frame of suitable form to carry the working parts of the regulator, but is represented inthe form which I prefer-viz., that of a cylindrical box,with in which all operating parts are inclosed and protected.

Y C D is the centrifugally-operating lever, at-

tached by its fulcrum-pin a to the carrier A tion of the regulator and projects across and beyond the axis of the regulator. The loaded arm C has provided for it a support, b, in an opening inthe back` of the carrier A, and

when the regulator is not in operation the said arm is held to this support by the eounterbalancing spring E, one end of which hooks onto a pin, c, on the said arm, and the other end of which is connected with a nut, d, which is fitted to slide without tarning in a guide, e, l on the carrier, and to which is tted an adjusting-screw, f, the head of which bears against the carrier. i

The spring E, represented of spiral form, is so adjusted by the screw f that when the engine is running exactly at the speed. desired its tension will so counterbalance the centrifugal force `developed in the lever C D that the latter will just touch, without pressing against, the support b.

F is the secondary lever, through which the oentrifugally-acting lever C D acts upon the regulating-valve. e This lever F is connected by its fulorum-pin gwith the carrier A on the opposite side of the axis to that on which the fulcrum a is situated. The shorter -arm of this lever F is in contact at hwith the hooked extremity of the arm D of the centrifugallyoperating lever, and the head t' of its longer arm is in contact with one end of the valveoperating rod G, which is situated inline and concentric with the shaft B. This rod G, in the example of my invention represented, is the stem of the regulating-valve H; but it is obvious that a rod occupying the same position might have the valve differently applied in relation with it to be operated upon by it. The said rod has applied to its other end a small hanging weight, I, which so presses IOO against it at j as to keep it always pressing against the head of the lever Fwith just sufficient force to keep the said lever in contact at h with the centrifugally-operating lever. This weight serves also to open the valve.

The regulating-valve H represented, and which I propose generally to employ on account of the very slight friction involved in its operation and the great variation of opening which it gives with a slight movement, consists of a hollow cylinder which slides in a casing, k, fitted to the steam-pipe J, and which controls the passage at Z Z.

W'hile the speed of the engine does not exeeed that desired, and for which the tension of the spring E is adjusted by the screw f, the eentrifugally-aeting lever remains just touching, but not pressing against, the support b, the centrifugal force developed in said lever being just counteracted by the spring 5 but when that speed is exceeded the consequentincrease of centrifugal force developed in the lever C D will tend to cause its arm C to assume a position farther from the axis of the regulator,

and so cause its hooked longer arm, D, to pull on the shorter arm of the lever F and canse the longer arm of the latter to so move the rod G as to contract the opening of the valve and reduce the supply of steam. As the arm G moves outward the tension of the springE is increased, so that it continues to counterbalance the centrifugal foreevery nearly. rlhe necessary action on the valve is effected by an extremely slight movement of the arm C, as this movement is multiplied in the arm D, and also by the lever F on the valve. The movements of the levers on the fulcra a g, which consist of very small pins, is exceedingly slight, and there is no perceptible rela'- tive movement of the centrifugally-acting and secondary levers at their point of contact h, the latter being always very nearly in a line passing through the centers of the fulerumpins a g, while the relative movement between the lever F and the rod G is simply that of a to secure by Letters Patent, is-

1. The combination, in a speed-regulator, of a rotary carrier, a centrifugally-operating lever attached to said carrier, and having one arm parallel, or nearly so, with the axis thereof, and another and longer arm extended across and beyond the said axis, an adjustable counterbalaneing-spring applied to the first-mentioned arm, and means of transmitting motion from. said longer arm to the legulatingvalve, substantially as herein described.

2. The combination, with a rotary carrier, of` a eentrifugally-operating lever, C D, ofthe bell-crank form, and asecondary lever, F, hav-v ing their fulcra in the said carrier on opposite sides of the axis thereof, a eounterbalancing-spring, E, applied to the bell-crank lever, and a screw, f, applied to said spring and carrier for adjusting the tension of said spring, all substantially as herein described.

3. The combination, with a rotary carrier, of the centrifugally-operating lever C D, the secondary lever D, and the valve-operating rod G, arranged in line and concentric with the axis of said carrier, substantially as herein described.

J. ERICSSON.

Vitn esses:

S. W. TAYLOR, ED. L. MonAN.

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