US2457192A - Governor with switch control - Google Patents

Description

Dec. 28,1948. l w.J.vw|LLiAMs 2,457,192

GOVERNOR WITH SWITCH CONTROL l Filed April fr, 1945 :s sheets-'sheet 1 m m A f fm 43 nn ,MI ,ma 40 '46 34 5. 'g2 35 56 25 L95 la U v /g 30 SAS 2/ 32 /5 20 /9 P 7 `49 36 .as 9 25 25W 2f ,5 2o Y 7 /5 a J p /9'\, ,/4 d3 45 53 .',A I. /2 l l ril . INVEN TOR.

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GOVERNOR WITH SWITCH CONTROL Filed April 7, 1945 3 Sheets-Sheet 2 'EZ/QQ l WJZZM" V Arme/vf? Dec. 28, 1948. 2,457,192

w. J. wlLplAMs GOVERNOR ,WITH SWITCH CONTROL Filed April 7. 1945 GOVEIZNOIZ. SHAFT EnP- M.

GUVEENOE SHAFT 2..P. M.

E: NUMBER 0f TURNS ON ADJUSTING UNG 7 Y 2 NUMBER OF TUIZNS 0N ADJUSTING RlNG 7 GOVBNO-R. SHAFT 2..P.M.

Arme/vw v 3 Sheets-Sheet 3 Patented Dec. 28, 1948 UNITED STATES PATENT OF .F l CE GOVERNOR WITH SWITCH CONTROL William J. Williams, Wilmette, Ill.

Application April A7, 1945, Serial No. 587,081

(Cl. 20o-80) 9 Claims. 1

This invention relates to ,governors with circuit controlling means adapted to open, close, or transfer circuits at predetermined speeds of rotation of an engine or rother rotary element. My invention is for use in operating transmissions, clutches, valves, `and the like and an object of the invention is to provide an eflicient improved type of governor mechanism producing a straight line curve of movement of the control member upon increasing and decreasing speeds of rotation in combination with the operation of -switch or circuit control means and .the ne adjustment of the action of the entire mechanism. .Moreover, my invention .provides a mechanism of the type indicated in which the driving shaft thereof continues operation after certain circuits have been actuated *fand I have provided ,means to take the increased .thrust developed after the operating point has been reached.

Another object of ,my invention is to provide an efficient governor and control mechanism .for two stage operations actuating a .plurality of switching means in seriatim to effectv various predetermined changes in mechanism both upon an increasing anda decreasing speed of rotation of the governor shaft or other driven member.

Further objects and advantages are within vthe scope of this invention such as relate to the arrangement, operation, -and function of the related elements of the structure, to various details of construction .and to combinations of parts, elements per se, and to economies of manufacture and numerous other features as will lbe apparent from a consideration of the specification and drawing of a form of `the invention, which may be preferred, in which:

Figure I is fa vertical elevation partly in section with the parts at rest of one embodiment of my invention;

Fig-ure II is a ver-tical sectional view with the parts shown in operation with the governor plunger tripping the switch;

Figure III is a similar view with the parts shown at still higher speeds of rotation;

Figure IV is a fragmentary top plan view of the governor mechanism showing means to prevent rotation of the bearing casing as seen from along the line IV-IV of Figure I;

Figure V is a sectional elevation of another embodiment of my invention with a two stage switch operating mechanism with the parts at` rest;

Figure VI is an enlarged sectional view of the embodiment of Figure V with the parts in Aposition to operate the rst of the two switches;

Figure VII is a similar 'sectional view of the Yparts in position to operate the second switch;

Figure VIII Ais a similar sectional view with the parts shown in position vat still hgher speeds -of revoluton of the governor shaft; while Figure IX is 4a 'cross sectional plan view on 'the line IX-IX -of Figure V;

Figure X is a sectional view of a modication `of -the `governor plunger top bearing usable with both embodiments;

Figures XI, XII, and XIII lare curves showing performance due to various adjustments of boththe adjusting ring andthe differential 1in Athe two stage switch action;

Figure XIV illustrates a sectional view of one type lof snap switch which I employ.

Referring to Figures I to IV, I have shown a governor 'and control mechanism housing '5 made in three parts as illustrated, 'having `an upper part which is Iadjustable with respect to the bottom part carrying the governor mechanism. By providing the three part housing 5, Iam enabled v.to permit the installation 4of the 'governor and vswitching arrangement to -be driven by `an engine or other source of power from which the parts are driven and the nal adjustment for the action of the switching means provided herein can be made while the eng-ine vor other driving source 'is running. To this end, the base 5 carries the '-knurled adjusting ring 1 which may be `secured in position by the hold down clip 8. The ring 1 is vscrew threaded as shown to receive the threaded top cap 9 to be locked in adiusted position by the locking screws 't0 as shown.

For example, in vinstallation the top part of kthe housing being vconnected with circuit control means has wiring connected thereto so that it is undesirable to adjust the top part of -the housing 5 while the engine is running. However, vby unloosi-ng the `clips 8, the knurled ring 1 may be turned after the set screws I'U have been un- -loosed and a satisfactory adjustment made `as this will move the upper part ofthe housing away 'from the ring and hence, away from the govern-or plunger so that the operation of the switches will occur Aat different times according to the adjustment. After the adjustment is made, the set screws i0 are located and the hold down clips are fixed in position yso that the mech- -anism will not thereafter get out of adjustment.

Within this housing 5 mounted in a suitable bearing I3 is the governor shaft I2, the revolutions -of lwhich may vary by being connected with some mechanism whose speed varies. The shaft i2 carries within the housing, the rotatable support I4 for the governor weights I5, the support I4 being pinned to the shaft I2 in the illustration. These governor weights I5 are pivoted as at point P to the support I4 so that under the centrifugal action of the revolving of shaft I2 these weights move outwardly and downwardly around the point P as a center.

A freely movable sliding plunger or controlling element I8 is provided with collars I9 and I9', while the weights I5 have a contact tongue or cam 20 fitting between collars IS and I 9 and adapted to move the plunger I8 longitudinally in line with the axis of the shaft I2 as cam 20 of the weights moves upwardly and downwardly as shown. It is to be noted that the weights I5 are recessed at 2| to receive the collar I9.

Each weight I5 is connected to the control plunger I8 by a pair of springs 25, one end of each spring 25 being connected at point S to the slide or control plunger I8 and the other end connected at the point W with the weight I5, the springs being normally under tension to retain the parts in the position illustrated in Figure I when the governor is at rest with springs 25 inclined upwardly as shown in this figure. The weights I5 move outwardly around the point P as a pivot as the speed of the shaft I2 increases with the result that the cam 20 moves the collar I9 and the control plunger IB tangentially in a vertical direction, assuming the governor to be located upright, as illustrated in Figure I. As pointed out in my copending application Serial Number 565,383, for Governor mechanism, filed November 27, 1944, I provide a governor having a straight line curve in operation. As stated in said application, the springs 25, which have a modifying influence on the action of the weights I5 being connected at one point S to the sliding control plunger I8, assumes various positions affecting the cycle of the movement of the weights I5, and hence the anchor of the controlling spring 25 is not xed in relation to the point W Where the other end of spring 25 is connected to the weight I5. It will be noted that the point W and point S may be so chosen that the springt 25 is inclined to the horizontal when the parts are at rest as shown in Figure I in the present case. As the speed of the shaft I2 is increased the fly Weights I5 move outwardly to various positions shown in Figure II and Figure III.

An important feature f the present invention is the use of the governor and combined switch* ing means designed to open, close, or transfer circuits at definite engine speeds. In the embodiment illustrated in Figures I through IV, the governor mechanism is associated with a single switch that transfers its Contact when reaching a predetermined speed and transfers back again when the speed drops approximately 25% below that point. If the governor continues to operate after the cut out, the weights I will fly out still further tending to greatly increase the pressure on the upwardly sliding plunger I8. A principal feature of the present invention is to provide eicient means for satisfactory operation in this type of mechanism. To this end, the plunger I8 is made in multiple parts with a loaded spring interposed therein so that until its switch operating action, the plunger parts operate in unison, but thereafter continued pressure due to increased centrifugal force of the outwardly moving weights, the loaded plunger spring is compressed and weights may come to their various natural positions up to the maximum speed to which the governor shaft may be subjected.

Referring to Figures II and III, it will be seen that the plunger I8 has a hollow open end 30 within which the coinpressible spring 32 is l0- cated, the spring tension of which should be suilicient f or the operation of the switch before compression. This loaded spring 32 is retained within the upper end of the plunger I8 hy the sliding stud shaft 34 bearing at its lower end against the spring 32, as shown, said stud shaft 34 having a shoulder 35 adapted to contact a flange 36 on the upper end of the hollow plunger I8 thus retaining the stud 34 in position.

At its upper end the stud 34 carries a thrust ball bearing Ill retained by having a press fit on the upper end of said stud 34. Surrounding the outer part of the ball bearing is the flange of the actual contact piece 42 adapted to operate the switch contact pin 43. Connected with the contact piece 42 is a spider 45 adapted to contact at its outer edges with stops 46 on the inner' case of the housing 5 to prevent spinning or rotating o! the upper portion of the ball hearing and contact piece 42. The member 45 or other type of suitable cage for the ball bearing is dished shaped as shown to form an oil well or reservoir 41 having an opening 48 communicating with the ball bearing il to lubricate the latter. Thus the contact 42 does not revolve with the governor parts.

In Figure XIV, I have illustrated partly diagrammatically a type of snap switch which I have used in my invention. The contact- s 65 and 66, to be opened or closed by the mechanism, are intended to control the circuit for operating the mechanism with which the governor control is to be used such as gear shifting, clutch and valve controlling and the like. One of these switch contacts 65 is stationary and located on an insulating block 6l. The movable contact 6B is mounted on a pivoted arm ISB, the switch mechanism having the center switch leaf I0 to be actuated hy the pin 43. A finger I I, is integral with the clamping plate and held in place by the screw 13, arranged to assert a constant pressure on the center switch leaf member' I0 yto open the contacts when the actuating pin 43 is released and also to return the pin 43 to its normal downwardly extending position. A snap spring connector I5 is interposed between leaf 'I0 and switch contact arm 68 near the contact 66 which facilitates throwing the contact 66 to either open position or to closed position depending on the position of the controlling pin 43 and is positive in its operation and action.

Of course, many other types of switches may be used with my invention.

From the foregoing it will be seen that as the speed increases. the parts move from the position shown in Figure I to that shown in Figure II to first operate the switch 44. The switch 44 may operate many types of mechanisms by electrically changing circuits to such mechanisms or to elec trical or pneumatic controlling arrangements for such mechanisms. The loaded spring 32 is at this time in its extended or non-compressed position as illustrated. Thereafter upon an increase in speed, the parts assume the position illustrated in Figure III in which the contact piece 42 is still in contact with pin 43, but the spring 32 is compressed (as shown) and upon such further increases in speeds occurring alter the top or contact piece 42 of the sliding multi part plunger has reached the maximum of its movement, the action of the fly weights l5 results in compressing the plunger spring, thus relieving the possibility of further or unduly increasing the pressure on the top of the plunger which would otherwise occur. The mechanism sacaste upon the switch mechanism 44 which is of vari- .ous types, one shown in Figure XIV such as those having spring means incorporated-therein lto `reset theswitch, is returned to 'normal position, or in the lowered position of Figure .I for -the:pin:43. Moreover, the pin43 may be the operating plunger -of asnap switch, this type being very sensitiveand accurate Ain operation. By lturning the knurled vring 'I `clockwise the switch means hereinafter set lforth 4will be moved farther away from the gover- -nor control element (plunger) and hence this adjustment will increase the speed at which the switches will be operated as will hereinafter appear. Turning the knurled ring I counterclockwise will have the lopposite effect.

My @invention also includes the -use of :a gover- `norsuch Aas the one yshown `in Figures -I to IV or a similar straight li-ne governor such as shown -in -my prior application `with or `without using the spring loaded governor plunger in combination with an automatically resettable switch mecha- `n-ism which operates to shut dow-n the entire mechanismincludingthe engine yor the other type of mechanical means which drive the governor sha-ft, `but which wi-ll automatically -reset itself as the speed decreases ready to repeat the action uponfutur-e operations of the entire mechanism. the switch 44 actuated by pin 43 `may `be of an instantaneous tripping type which operates `to cut off the engine at a predetermined speed and thus stop the governor shaft and which will automatically reset itself ready for the next operation. `lll/'ith Iself setting switches it may be necessary to have a self holding relay for satisfactory operation.

Under vcertain conditions, I may use a governor mechanism illustrated with a switch which is actuated in ,one direction by the pin 43 to cut ofi a .Circuit (and thus stop the engine for example) but which has to be manually reset.

In the embodiment illustrated in Figures V through IX, I have illustrated a two stage governor and switching mechanism containing two switches, each operating independently at different speeds. By means of external adjustments both'the operation of the switches in relation to the engine speed and the differential between the action of the two switches may be Varied. Incorporated in this embodiment is means whereby the first switch will transfer its circuit at a certain R. P. M. thereafter the second switch will be ,operated as the speed of the governor shaft further increases and reaches another higher pre-- determined speed. On reverse, as the speed is decreased the second switch will retransfer back to its initial position at a predetermined speed be- V,lw its initial operation.

As one efficient mechanism embodying these features, I have illustrated in Figures V to IX the three part governor housing 5, the shaft I2, fly Weights I5, and multiple part sliding plunger Ill, as in the embodiment of Figures I to IV. However, in the present instance the contact 42,

vinstead of directly operating the switch pin 43, acts upon a switch lever 5l), preferably of the construction illustrated in section in Figures VI and 1IVIFII. This lever 50 oats but is arranged to pivot first at one end and then at the other to properly l operate tthe two 'switch :pins 1143 :and 43' at ,different times. .'Io'thisiendthc lever .'50 4"has `on .one .endfa depression .or v'bearing r5.2 ltting lon a pivot 53 as shown. The.:lev,er,also hasia'bearing .ati54gfor `receivingtheicontact/42 and` two bearings K55 ,and *.56 adapted 'to `contact .the-"switch :pins 43 4and 24.3 respectively. .As the multiple plunger I8 moves :upwardly 'under :the influence of the fly weights d5, the :lever 50 :pivots at '53 so Athat pin A'x43' is 'first .operated. The other 'switch .pin is `subsequentlyoperated as the .speed of the ,govermor yshaft increases, .and tto 'this `.end I .have provided .1an adjustable loaded spring mechanism 'to :determinewhenthis will occur. Thus, as `.shown :in Figure VI,'thepivot '.53 :is supported Iin a, 'housing A60 which .contains a :compressible vspring 6 I 'the position of the upper end :of which `is adjustably determined by the adjusting screw 2 thread- .ed ,into `the end of the Ahousing 60.` When the pressure moving the plunger aI- 'upwardly -sufficientto overcomethe pressure of the spring 6I, ithe pivot 53, shown at the right hand fin Figure VI, gives away, whereupon the lever 50 becomes piv- .oted .at the other side ofthe housing. Upon fur- :ther movement, the second .switch pin '43 is operated. This action is illustrated in vFigure VII where it will befseen that spring EI has been cornpressed compared to the position of the parts in Figures V and VI, while the loaded plunger spring 32 remains in uncompressed positioh as illustrated during both switch operations in this embodiment.. As the speed of the governor increases `beyond the speed at which the second switch 4.3 is operated, it will be seen that the plunger :spring 32 will thereafter be compressed 'as illustratedy in Figure VIII and the fly weights may come to their natural mechanical rest without imposing too great a pressure on the contact 42, floating switch lever 50, pins 43 and 43 and all the associated parts since the loaded plunger spring 32 absorbs excess thrust.

One use of the embodiment of my governor and switch mechanism illustrated in Figures V through IX is for electrically controlling pneumatically operated gear shifting mechanisms, for example.

When at rest, the parts are as illustrated in Figure V and the switch pins 43 and 43 are in their lowered normal position. As the speed increases, the governor weights I5 fly outwardly and the telescopic multiple part plunger I8 operates through the contact 42, the floating lever 50 which pivots around the pivot 53 during this operation. Actuation of switch 43 is arranged to electrically control shifting, for example, from low gear into second gear. Upon further increase of speed the pressure overcomes the resistance of spring 6I whereupon the floating lever 50 moves upwardly and pivots at the left hand side of the housing top to throw the switch pin 43". This is connected electrically with a means for shifting the gears, for example, from second to high (on an automobile). By a proper adjustment of the adjusting screw 62, the differential between the action of the two switches may be varied as desired.

` ratus I have made, using various adjustments of the adjusting ring 'I and the differential screw 62. The adjustment of the screw 62 determines the spacing in speed of operation of the governor at which the second switch 43" operates as ccmpared with the yfirst switch 43'. On the other hand, the adjustment of the ring 'l determines the .speeds at which the whole mechanism operates under a given adjustment of the screw B2 for various speeds of governor shaft.

The curves illustrated in Figure XI were made with the differential screw 62 adjusted to a minimum and held constant at that point. Curve A :represents the speed at which the first switch 43 `operates while curve B illustrates the speed at which the second switch 43" operates. These occur in sequences upon acceleration of the governor shaft, these revolutions being illustrated in the vertical column in the left hand side of the chart while the number of turns of the adjusting ring 1 are illustrated in the horizontal line at the bottom beginning at the lower left hand corner. Upon deceleration, the curve C represents when the second switch 43 will be disconnected and the 4th curve D represents when the first switch 43 is cut off. For example, if the adjusting ring 1, according to the curves illustrated in Figure XI, is adjusted two turns clockwise, then the first switch 43 will operate about 1300 R. P. M. of the governor shaft. The second switch 43 will operate at about 1575 R. P. M. Upon deceleration the second switch 43 cuts out at about 1450 R. P. M. of the governor shaft, while the first switch 43 cuts out at about 1175 R.. P. M.

Referring to Figure XII, in this case the illus- 'trations are similar to that of Figure X1, except- "ing that now the adjusting screw G2 for the differential action between the two switches 43 and 43 is adjusted to its maximum position and held constant. It will now be seen that the operation of the second switch 43 shown by curve B',

Figure XII for two revolutions of the adjusting ring 1 does not Operate until the governor shaft has reached nearly 2000 R. l?. M. Upon deceleration, the switch 43". cuts out at about 1800 R. P. M. as shown by the curve C' in Figure XII. The first switch on deceleration, as shown by the line D cuts out at about 1175 as in the other example of Figure XI, the same having cut in on acceleration as shown by curvo A. at about 1300 R. P. M.

Figure XIII is limited to a consideration of the performance of the mechanism with a fixed position of the adjusting ring l' but by various positions of the adjusting screw 52 which changes the relative R. P. M. at which 'the second switch operates compared with the first. Here, the curve A" shows a fixed speed of 1000 PZ.. P. M. at which the first switch 43 is cut in. The curve B shows the R. P. M. of governor shaft at which the second switch 63" cuts in upon different turns of the screw 62 as indicated at the bottom horizontal line. For example, with five turns downwardly of the screw 62, the second switch 43" cuts in at about 1700 R. P. M. of the governor shaft as shown by the line B. The curve C shows when this second switch cuts out which is at about 1575 R. P. M. for five turns of the adjusting screw under the example. The line D of Figure XIII shows the speed at which the first switch 43 cuts out, which in the embodiment tested was about 890 R. P. M. of the governor shaft.

A consideration of these curves illustrated in Figures XI, XII, and XIII, shows what Various results may be produced if the two adjustments are made simultaneously, namely adjusting the ring 1 for a proposed range and thereafter adw justing the screw 62 for desired differential in the speed of operation between the switch 43 and l switch 43". This indicates that my invention has a very Wide range of adaptability for operating various circuits.

In Figure X I have illustrated in lieu of the ball bearing between the upper part of the telescoping plunger IB and the contact 42, a modification which may be used with either of the embodiments of Figures I to IV or Figures V to IX. In this case, the upper contact piece 42 is of hardened metal such as carboloid and is connected with the stud shaft 311 which in turn contacts with the loaded compressible spring 32 sliding within the upper open end 30 of the plunger I8 as in the other embodiments.

It is apparent that within the scope of the invention, modifications and different arrangements may be made other than is herein disclosed, and the present disclosure is illustrative merely, the invention comprchending all variations thereof.

What I claim is:

1. The combination of a governor housing; a driving shaft carried by said housing; centrifugally operated fly weights surrounding said shaft and rotated thereby; a sliding plunger operated by said weights; a switch operating lever; a plurality of switch actuating elements; means to move said switch lever from said plunger; arranged whereby said lever is first moved to operate one of said switch elements and upon continued pressure of said sliding plunger subsequently operates the other of said switch ele ments when the speed of the governor shaft increases.

2. The combination of a governor housing; a driving shaft carried by said housing; centrifugally operated fly weights surrounding said shaft and rotated thereby; an articulated spring loaded sliding plunger operated by said weights; a plurality of switch operating elements; a switch lever; means to move said lever from said plunger; the mechanism arranged whereby said lever is first moved to operate one of said switch clements and upon increased speed and continued pressure of said plunger to subsequently operate the other of said switch elements, the spring of said governor plunger adapted to yield upon still further increase in speed of said driving shaft.

3. The combination of a governor housing; a driving shaft carried by said housing; centrifugally operated fly weights surrounding said shaft and rotated thereby; a sliding plunger operated by said weights; a floating transverse switch operating lever; means to move said lever from said plunger; spaced movable switch pins carried by said governor housing; and means forming a plurality of pivots for said switch lever including a spring loaded movable pivot, said pivoting means carried by said governor housing and arranged whereby said lever is first pivoted from said movable pivot to operate one of said switch elements and upon continued pressure of said sliding plunger subsequently operates to actuate the other of said switch pins.

4. The combination of a governor housing; a driving shaft carried by said housing; centrifugally operated fiy weights surrounding said shaft and rotated thereby; an articulated spring loaded sliding plunger operated by said weights: a iioating transverse switch lever; means to move said lever from said plunger; spaced movable switch pins carried by said governor housing: and means forming a plurality of pivots for said switch lever including a spring loaded movable pivot, said pivoting means carried by said governor housing, the mechanism arranged whereby said lever is first pivoted to operate one of said switch pins and upon increased speed and continued pressure of said plunger subsequently operates to actuate the other of said switch elements. the spring of said governor plunger adapted to yield upon still further increase in speed of said driving shaft.

5. The combination of a governor housing; a driving shaft carried by said housing; centrifugally operated fly weights surrounding said shaft and rotated thereby; an articulate spring loaded sliding plunger operated by said weights; a floating transverse switch lever; means to move said lever from said plunger; spaced movable switch pins carried by said governor housing; and means forming a plurality of pivots for said switch lever including a spring loaded movable pivot, said pivoting means carried by said governor housing, the mechanism arranged whereby said lever is first pivoted to operate one of said switch pins and upon increased speed and continued pressure of said plunger subsequently opcrates to actuate the other of said switch elements, the spring of said governor plunger adapted to yield upon still further increase in speed of said driving shaft.

6. The combination of a governor housing; a driving shaft carried by said housing; centrifugally operated fly weights surrounding said shaft and rotated thereby; an articulated spring loaded sliding plunger operated by said weights; a floating transverse switch lever; means to move said lever from said plunger; a ball thrust bearing between said plunger and said lever; spaced movable switch pins carried by said governor housing; and means forming a plurality of pivots for said switch lever including a spring loaded movable pivot, said pivoting means carried by said governor housing, the mechanism arranged whereby said lever is first pivoted to operate one of said switch pins and upon increased speed and continued pressure of said plunger subsequently operates to actuate the other of said switch elements, the spring of said governor plunger adapted to yield upon still further increase in speed of said driving shaft and means to prevent rotation of said lever moving means.

'7. In combination, a governor housing; a driving shaft mounted therein, y weights surrounding said shaft and driven thereby; a sliding plunger operated by said fly weights, said plunger having a cylindrical open bore in its outer end; a loaded spring in said bore; a movable member in said bore above said spring; a contact operating element; a thrust ball bearing interposed between said member and said contact to take the thrust .when the pressure of the plunger is suilicient to overcome the resistance of said loaded spring; and means to prevent the outer cage of said ball bearing and said contact element from rotating, said means including a spider contacting the governor housing said spider having a dished shaped center forming an oil well for receiving lubricating oil and an opening therefor into the Vball bearing.

8. In combination of a governor having a driving shaft; centrifugally operated fly Weights surrounding said shaft and rotated thereby; a movable controlling member operated by said weights;` a plurality of switch actuating elements; a switch operating lever; means to move said switch lever from said controlling member whereby said lever is first moved to operate one of said switch actuating elements at one speed and when the speed of the governor shaft further increases to subsequently operate the other of saidswitch actuating elements; and means to varyfthe differential in the speeds at which said switch actuating elements are operated.

9. In combination, a governor housing; a driving shaft mounted therein, ny weights surrounding said shaft and driven thereby; a sliding plunger operated by said fly weights, said plunger having a cylindrical open bore in its outer end; a loaded spring in said bore; a movable member in said bore above said spring; a contact operating element; a thrust ball bearing interposed between said member and said contact to take the thrust when the pressure of the plunger is sufilcient to overcome the resistance of said loaded spring; and means to prevent the outer cage of said ball bearing and said contact element from rotating, said means including a member interposed between said outer cage of said ball bearing and the governor housing.

WILLIAM J. WILLIAMS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date '779,222 King Jan. 3, 1905 1,959,173 McNairy May 15, 1934

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