US942900A - Centrifugal governor. - Google Patents

Description

G. P. HALL. GENTBIFUGAL GOVERNOR APPLIUATIOH TILED MAR. 23, 1908.

942,900. Patented 1m 14, 1909.

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CHESTER P. HALL, OF CHICAGO, ILLINOIS.

CENTRIFU'GAL GOVERNOR.

Specification of Letters Patent.

Patented Dec. 14, 1905.).

Application filed March 23, 1908. Serial No. 422,688.

T 0 all whom it may concern:

Be it known that I, Oirns'rnn P. i-Lrn i, a citizen of the United States, reslding at Ohicago, in the county of Cook and State of I lllinois, have invented certain new and use ful Improvements in Centrifugal Governors, of which the following is a specification.

My invention relates to improvements in centrifugal governors.

One of the objects of my invention is to provide an auxiliary regulating means for centrifugal governors, of the usual iiy ball type, whereby said governor is caused to act promptly and positively at any desired critical point within its scope at which there is a change of velocity or tendency to change velocity of the motor associated with said governor, and before said change of velocity shall effect a material difference of speed of said motor.

Other objects of my invention will become apparent to persons skilled in the art from a. consideration of the specification taken in conjunction with the drawing, in which;

Figure 1 is an elevation of an ordinary fly ball, centrifugal governor with my attachment applied; Fig. 2 is an enlarged fragmentary detail, part of which is shown in longitudinal section; Fig. 3 is a cross sectional view taken on line 33 of Fig. 2.

In all of the views the same reference characters indicate similar parts.

A hollow column, or pillar 5, affords support for the governor mechanism within which the driven spindle 6 is adapted to be rotated by the motor, the speed of which the governor is designed to control by varying the motive fluid supply thereto. A cross bar 7 is fixed to the upper end of the spindle 6, to the extremities of which are freely pivoted the centrifugally responsive weighted arms 8, 8 respectively. Said arms carry on their free extremities the weights 9 and 9 respectively. A cross-bar 7 surrounds the upper end of the sleeve 10, being loosely fitted in a groove therein to permit free ro tation of said cross bar thereon. The sleeve 10 has free vertical sliding movement on the spindle 6 and within the pillar 5. Connecting links 11 and 11 are freely pivoted to the ends of the cross bar 7 and to the respective arms 8 and 8. A pin 12 is attached to the sleeve 10 and projects through the slot 13 made in the upper end of the pillar 5. A lever 14: is secured to the shaft 15, which has oscillating movement within bearings upon the pillar 16. A link 17 is freely pivoted to the lever and to the pin 12, the other end of the lever 1 f being pivoted to the valve-actuating rod 18.

(then the governor, thus far described, and which by the way forms no part of my invention, is at rest the position of the parts is shown in dotted lines. it hen the motor with which this governor is associated. is running at the speed which it is desirable to maintain constant, the parts of the governor will occupy practically the positions shown in full lines. The control of speed of the motor is ultimately attained, through the illstrumentality of the governor, by the change of position of the fly ball weights 9 and 9.

After the balls have assumed a position, such as indicated in full lines, and the motor is operating at a speed which it is desirable to maintain constant, under all conditions of load, it is well known that, before the governor can overcome its own inertia or inc-- mentum and act to vary the supply of motive fluid, considerable variation of speed has been effected by the motor. It is to hasten the action or prevent delay in the operation the governor parts that my device is designed to accomplish. This is done by producing a positive action of the 1 ts that effect the regulating functions of the governor at a critical period, so that the governor is caused to act powerfully and ositivel T within small limits of its ran e before any material variation of the velocity, or of the speed of the controlled. motor has taken place.

The ordinary fly-ball governor is subject to variations of centrifugal effect due to change of velocity, the balls flying out, as shown in full lines in Fig. 1, upon the occa sion of an increase of velocity, and returning to normal positions u 3011 a decrease of velocity. If an additional weight could be applied temporarily, as required, to assist the balls through the effect of gravity to move them in either direction, only when they have been moved to abnormal positions, and to return them to normal position the governor would thus be caused to operate more positively and with greater celerity at the desired critical time. On the shaft I place, in the illustration shown, my device for accomplishing the results to which I have heretofore referred.

A tube 20, preferably composed .of iron or glass, closed at both ends, as by caps 21 and 21 is bracket 2:2. nect'ed and t'rictionally secured cated, triangular supporting pm 23. as by the bolt 2% and the thumb nut 25. The low r of the bracket is provided with a scale.

This bracket is pivotally conpart:

ad acent a nxed mark or pointer QT secured o the part provided with threaded ends which, with the nuts and 2% in angular-slmped bolt 28 and 38" t in conjui'iction with the angle pieces r info-ides a convenient means olt securing the U angle piece 22-) lirmly in *ontact with the may t The tube and bracket be "reely moved about the axis allorded by the boot 2t and securely fixed in any desired position by the clampii'ig thumb nut 25.

it series of continuous battles comprising in the specific illustration shown, spir; lly arranged walls 30, around an aiIial y arranged rod secured to the ends L1. 21 by nuts 32 is lo *ated within the tube 20. The battle plates are a trifle smaller in character than the interior of the tube. The tube 20 contains mercury 2:31, being prete ably about I i-illy the positions indicated in full lines at he time when the desired speed is reached, atwhich time it will be noted that the tube 20 occupies substantially a horizontal or baanced position. it slightvariation from this position will shift the weightof the tube 20 in a direction to assist the balls in whichever direction they have been moved as a result of changed velocity. i hcn the balls are about to change position,

secured at or near its center to a I t a bitfurt tionar v a change in. velocity of the engine move slowly, but a slight; moven'ient 'iereot will produce an inclination if the die sullicient to cause the mercury to How herein toward the end ot the tube which wih hasten the movement of the balls by the :dded. weight of tl e mercury. The series of continuous battles permits the mercury to slowly move through the obstacles and to attain a level top surface distributing tie weight. sub tantially in proportion to tie h e of inclination and to admit all oil. the

to to i i tl(1'(ll] to either end of the tube when the tube has been inclined to a greater or less degree. The scale and pointer 26 and. 27 provide means tor preserving the desired ptmltltjll. ot the tube when it has been removed and replaced, and the joint at this point the axis atl'ordcd by the screw and nut and provides a means for adjust ing the inclination of the tube to coincide with the adjustment of the governor. The attachment for securing the device to the shaft 15 at't'ords an adjustable means that may be varied to compensate for governor shuts of varying diameters.

rtaving thus described my inventiom what I claim and desire to secure by Letters latcut, is:

1. in attachment for centrifugal governors, comprising a tube closed at both ends, a spiral batlle-nuams, and a. mooilo mass within the tube.

in a device oil the character descril ed the tube 20, provided with interior battles and a mobile mass the bracket provided with a scale so, to which said tube is secured, at bifurcated angle-piece 23, adjustably secured to said bracket, and a bolt 28 for securing the device to a shaft.

In testimony whereof I hereunto setmy hand in the presence of two witnesses.

UtilQSillLli-t P. HALL.

In the presence of- Forum Brim, tlLtARY i ALLEN.

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