Патент USA US2406226код для вставки
Aug., 20, 1946. __ A, l.. mMBALL WASHING MACHINE Filed July s, 1942 Figz. _‘ 2,406,226 3 SheAets-Sheet‘l Argh@ 1.-. Kimball; His Attorney. Aug. 20, 1946. ' Ü ` » ' A. L. KIMBALL ' ` 'WASHING MACHINE ,2,406,226 _ AFilad July s, 1942 " ` ì _' zangers-sheet *.2 Arthur* L. Kimball ,. v by .Mwyc‘f ' ' [His- Attorneg. Auïg'. 2_0, 1946. ~ „ l A. l..v KIMBÁLL WASHING MACHINE Filed July 8, «1942 2,406,226 - Patented Aug. 20, 1946 2,406,226 " .UNITED ?STATES PATENT OFFICE 2,406,226 WASHING MACHINE Arthur L. Kimball, Schenectady, N. Y., assignor to General Electric Company, a corporation of ` New York Application July 8, 1942, Serial No.' 450,131 6 Claims. l (Cl. 210-71) vThe present invention relates to washing ma chines of the type having a spinner basket in which the clothes are centrifugally dried. a circumferentialgroove I1 receiving a snap ring I 8 for engaging a shoulder I 9 on the tubular shaft l6»so as to support the sleeve I3. The projec »During centrifugal drying there-are unbalanced tions I 4 are spaced ‘apart so as to provide drain forces resulting from non-uniform distribution of clothes in the spinner basket, from gyration of the driving mechanism and from precession of the spinner basket. Y (Il > passages 20. At the lower end the sleeve I3 has ' a projecting ñangeZI and a nut 22 both of great er diameter than the clearance opening 23 in the carriery hub ï1.‘ The flange and nut which are spaced on opposite sides of the carrier hub ac cordingly confine the carrier hub >on the sleeve I3 and at the same time permit relative move ` The object of my invention is to provide an improved construction andv arrangement in which objectionable vibration resulting from these un balanced forces is kept at a minimum, and, for mente» a consideration of what I believe novel and my » ` Y . Y . . - Y The -driving connection between the shaft I6 invention, attention is directed to the following description and the claims appended thereto. and the spinner basket comprises a spider 24 15 fixed to the lower end of the sleeve I3 and having A In. the drawings, Fig. 1 is a sectional elevation radial arms 25 intermediate the carrier» arms 6. of a washing machine embodying my invention; Fig.` 2 iszan enlarged sectional elevation of the support for thespinner'basket; Fig. 3 is a sec The arms 25 are connected to a flexible steel ring , 26 which atintermediate points is connected tov the carrier arms 6. The connections to the arms tional view on line 3-3 of Fig. rl; Fig. 4 is a sec tional view on line 4-4 of Fig. 2;V Fig. 5~is a sec tional view taken on line 5-5 of Fig. 2; Fig. 6 is 6 and 25 `are made through bolts 21 having bush ings 28' which clamp the ring against the heads ofthe bolts. The clamping surfaces are cham asectional elevation of the driving mechanism; fered, as shown at 29, so as to prevent localized Fig. 7 is >a sectional View on line 1-1 of Fig. 6; and Fig. :Sis a sectional View taken on line 8-8 25 stresses in the ring. The connection between the bolts 21 andthe carrier arms 6 is complicated of Fig. 6. by the fact that the carrier arms have a stiffen Referring to the drawings, there is shown a ing rib 30 directly .above the desirable vposition washing ‘machine having an outer casing I in the for the bolts. The connectionis accordingly upper part of which is a spinner basket or clothes receptacle 2 having outwardly flaring fluted >side walls 3 provided with centrifugal discharge’open 30 ings 4 at the region of maximum diameter. The ‘ spinner basket is made of .relatively thin‘sheet metal, which may be porcelain» enameled> steel, and is'removably supported in a combined car rier and balance ring having relatively heavy side made through projections 3| on bushings 28 (Fig. 4) which are riveted at 32 to the under side of thecarrier arms, and the carrier arms are- provided with. holes 33 through which a wrench may be inserted'totighten the bolts. The above described construction >provides a support .for the spinner basket which permits' a universal tilting of' the spinner basket relative walls 5 surrounding the spinner basket and spaced to the driving shaft I 6. This tilting tends> to radialtarms 6 extending `beneath the bottom of neutralize’any .unbalanecd couple or dynamic the spinner basket and connecting the side walls unbalance which would otherwise transmit ob _5 with a hub .1.v The carrier sidewalls 5, as 40 jectionable vibration to. the driving shaft. 'I'he shown more clearly in Fig. 3, loosely surround spinner basket is also resiliently supported for the side walls. of the spinner basket. Possible rat axialmovement with respect to the shaft to tling due to this looseness is prevented by rubber cushion axialv forces which, as hereinafter ex bushings *.8 bolted tothe carrier side walls -and plained, while thespinner basket is rotat having flexible projections 9 which fit in the` - ing with arise precession and unbalanced distribution flutes in the side Wallsof the spinner basket. of the clothes. ` The spinner basket is secured to the rcarrierfby Animportant feature of this universal con means of a nut I0 threaded on a sleeve I I fixed nection is its relatively low friction which re tween the nut I0 and a shoulder I2 on the sleeve 50 sults from the use of a material of low internal friction'forthe .ring 26 and from >the design of II.y The carrier hub 1 loosely surrounds a sleeve the connections to the ring so as to minimize I3 which at its upper end,as shown` in Fig. '5, to the carrier hub, the basketbeing clamped be has inwardly extending projections .1I-4 provided with axial grooves I5 by means of which the sleeve issplined on a tubular Ashaft I _6 and _with the friction.. The lowfriction is important in preventing forward precession. or shaft whip which is 4excitedby friction in the rotating parts. . Low friction `means low exciting force. «5 2,406,226 between anoutwardly extending Ilan-ge, |08 ,at the lower end ofthe supportingfmember~v|03 and a; ring |09 clamped betweenA a flange >IIIJ at ~theyupper edge ofthesupporting ring> 13 anda ,flange III at the lower end. of a supporting ring H2. The,rub.ber vring |01 isrconñned -between lthe supporting ring 13, the'supporting member I04,.and a ñange H3 at the inner end of the .ing `also rotate on and gyrate. about, these axes). . ; lDynamic, unbalance is neutralized.` by ¿the` tilt able support, of the spinnerbasket provided :by \ the; rinfë,r 26,. , The basket tilts ¿relative to the shaft I‘Bto _a position in which there. isnounba-lr , ancedcouple. , \ > Of Ycourse ,thejstatic and -dynamic unbalances are not perfectly neutralized bythe tiltable sup-> ports. provided by the rings |01 and 2‘6. Thefsti?f- , ness of ,the rings limits the degree of. neutraliza ring; |09. Rotation of the rubber ring |01 rela tiveto the support |04 and the ring |019 is pre, Il) vented by tabsA ||4 struckout- of parts I 09and |08 and fitting in notchesA in the rubber ring. . Dynamic and static unbalance, cause vibrations The rubber ring |01 is rinitially compressed to a of shaft frequency which are iof greatest magni-V point `at which its modulus. ofelasticityincreases. tude at the critical speeds, thepspeeds at which This means that upon tilting of the- spinner bas, the shaft speed is resonant with one ofthe nat’ ket- from a ,central position the restoring force due ural frequencies of. vibration of _thefrotating _sys to the rubber ring increases at a continually in tem (the basket, shaft, gear- c'asing,-„etc.). In creasing rate. Also, since, _the pressure onthe the present machine there are two critical speeds brake shoes |05 is dueto the weight of the spin to be considered, the ñrst critical `speed infwhich ner vbasket and gear ca_sing. and the compressive the basket and other parts supported. by the íru-b forces in the `rubber ring, the `pressure on the tion. brake shoes increases as the spinner basket tilts away; fom its central position. y This means >that theI friction damping eiîect of . the brake shoes |05 increases as the spinner basket moves from its central position. , - ' .ber ring |01 vibrate as a unit, on the >ring and the second critical speed in which the basket would tendv to tilt or vibrate v`relative to thefup per end of the shaft I6. vThe first critical _speed is dueV to the rubber ring |01_and Vcan »be called a “mounting" critical speed. The second critical The spinner basket and its driving mechanism speed, in which thereis ilexure between the shaft are all supported from the bottom wall of the and the basket, can bev called a “shaft’f critical outer „casing by -a flange II5 on the ring ||2 which is clamped between a ring ||3a and the 30 `It has been observed, and these observations bottom wall of the outer casing. The upper end have been checked --by theoretical computations, of »the driving mechanism_ projects through a ' that the second critical speed vexistsonly _when clearance opening IIS in the bottom wall of the the moment of inertia of the basket aboutthe outer` casing which is sealed by a rubber sleeve axis of'rotation is less thanr the moment _ofy iner .|I1 having its upper end ñxed tothe tubeV 93 tiaof the basket aboutuan axis at right angles by a clamp ||8 and having its lower end clamped tothe axisof rotation and through >its center of between a ring IIS and the upper side of the gravity. The second critical speed, beinghigher bottom wall of the outer casing. Y than the ñrst critical speed, is objectionabledue __ Duringwashing, the brake shoe 69 is applied, holding the gear housing 41 vstationaryand caus 40 to the» higher centrifugal forces which make’it more diilicult _to bring the spinner basket.;> up ing oscillation of the agitator 34. During cen through the second critical speed. . This second trifugal extracting, the brake shoe 60 is released criticalspeed has beeneliminated in the present and-the motor 5| is reversed to couple the hous construction by making the moment of ,inertia ing to -the pulley 54 through the overrunning o_f the basket about its axis of rotationgreater clutch Blf-9 I. " than the moment of inertia> of the basket about j During centrifugal extracting, the clothes will an axis at right angles to its axis of rotation :be non-uniformly.- distributed causing an unbal and through its 4center of gravity. ' ' ance which can be divided into a static unbal The rubber ring |01 is preferably proportionl ,d ance (equivalent to a weight shifting the center of gravityof the lbasket transverse to its axis of 50 sov that the first critical speedv is substantially speed. Y ' , ' , _ >belowthe normal extractingspeed.V In the-pres; rotation) and a dynamic unbalance (equivalent ent machine the critical speed due to~ the ,rubber to `a couple tending to tilt the basket about an ring |01 (the natural frequency of vibration of the basket, shafts, gear casing,_etc., on the rubber »_axis perpendicular to the axis of rotation). Static unbalance during spinning is neutralized bythe gyratory support provided by the rubber ring) is of the order of, 100 R. P. M., >whilegthe v extracting speed is 1200 R. P. M. Itis of ccn ring I 01 which permits tilting of the spinner shaft IB about the center of the gear casing to bring the center of gravity of the spinner basket siderable advantage to have the natural frequency due to the rubber ring ¿|01 `(the firstV critical speed) low so that the centrifugal forces due to the unbalance, which vary` as the square ofthe speed, will be small. If the critical speedishigh directly above the center of the gear casing. , In this position„the spinner basket rotates about its center of gravity.'v From one aspect, the rubber they centrifugal forces which vary as the square of the speed will be correspondingly higher and the ring |01 can be considered as resiliently sup portingA the shaft, gear casing and basket for gy friction forces on the’ bearings may be sufficient to keep the basket from coming up to speed.- \ ratory movement. While the spinner basket is rotating about its center of gravity.. the upper VVAnother feature in the present construction which assists in bringing the basket up vthroughV end of the agitator hub, which` is at the geometric center _of the basket, describes a circle about the center of gravity having a radius equal to the l displacement of the center of gravity due to static unbalance. The motion of the spinner basket can be divided into two components, rotation on> its -geometric axis andfgyration about an axis passing through the center of gravity of the spin- - the critical speed is the friction damping vpro vided by the brake` shoes |05which frictionally resist tilting of the axis of rotation and accord ingly limit the> amplitude of the >vibration at- the critical speed. This'limitation on the amplitude at the critical speed keeps thenspinner basket in ner, _basket and through the center of the gear a more` nearly centralposition in which. it,> can casing. (the spinnershaft I 6 and the gear cas-> » At more speeds easily abovev accelerated.. thjeilr'st critical‘fs'pe'e f ` ,. ' ).f @there ' 75 be encens@ y ¿areägyrcfscopic svibrati'ons Ißlmonmjrascpreeession. v ïto "eirectively' cushion `this,` axial -‘Kforce -and upre Iventîtrìinsmissiontothe door. ívibrationsconsistfor:eitnerëaiorvvardror a ~ _ 1 'i l ‘ ‘ The ¿above :described construction producesi-a fcórnpact arrangement Vofìith'e _ Y Thacilsiíva‘rdar‘otationíoi-îthe basket aboutfitsëlaxisiof «andßbackwardrprecession. f'Du'riîng 11a-recession lthe ' ïthe resilientT -`support, " and ‘ 'the `îfrict‘ion damper. 'contained "Witl?n a Y The ' 'ïdrîiving :mechanism ’is basket gyrates around the positionfof perfectibal» f ‘spherical'îhousing -concentric vwith the :friction fïaìnceïwith the -resultant vVibration. "Precession, fdamper and lwith the brake for controlling Vthe lwhich »is` ¿usually " important v'iat ‘speeds near the «drïivingf‘mechanism.f ISince the driving >'finecha «centrifugal vextractingi peedg'lis decreased-'or' pre-v 10 -nismbccupiesáa 'minimum of,> space, it. canß'be yvented" by the friction damping-effect of the‘brake made :relatively ISlight and. accordingly- will h shoes |05 which act through the sleeve 93-'ïi‘n «ti'onalilyf ¿resist “tilting L»of .the '1 axis` fof ' rotation of tth'feàbas‘ket. Forwardfprece'ssion, which is ¿due `to Viî’ric'ti: inthe ‘rotating system, isi 'kept to «a Ln‘lïin 4»imum'iby:makin'g 'the ring `îZ-G'Iof'a .'rnaterial having ilòw ínternal’fri‘ctiomsuchas spring steel, andlby ».desi'gningkthe »connectionsfto the ring Iso ‘to niininmmy of inertia reaction on the' bearingsfsivli .and 95 ‘during theextracting operation lwheniit is .forcedîtofgyratewith'the basket. The reaction -due' to ‘the iforiced :gyr’ation ofthe gear .casing lis -further‘- decreased by 'the »fact that the casing 4.is Vspherical#and rotates :atfthe same `speed` as ¿the basket. .In 'perfect -'sphere `4while rotating can :be tilted about l"any axis >without producing VIan'ylre iminimiz'eìfriction.. has ¿been Ademonstrated by ' faction. ¿In the present lgear »'casin‘gfthe ïin’ertia «adding'ifriction'intthe supporting ring"126'that for-` 20 reactionfdue :toiits `forcedgyration `is .due to ilthe fward-preces'sion may be ‘excited `to a value diiiie f deviation - of '.th'e gear i» casing ffro'm fa. theoretically `fcuf'ltiit’o control by the brake shoes P05. ’The ìresilient" support for ¿tilting >'of the basket u‘e'latiiìe î=to 4thevs'ha’ft is designed for-a minimum «of ïfriction while ithe'resili'ent support for «g'yfraf perfectly'balanced sphere. L 'Ifhisëdeviation can ‘be ikept toria minimum by counterweights lsuch as the >Jo'ossîßi) .and .the "counterwei‘ght Y88. What I claim as new and desire âto `'secure-»by itibnzof 'the shaft is Adesigned V‘to have friction Letters'î-Patentof Ythe UnitedStates is: f damping providedlin the present construction by r¿thebrakeis'hoe's i105. The friction in the resilient' support for the basket is low compared tothe ' ¿friction lthe resilient support for the shaft. i; « tion ihaving spaced ‘points alternatelycbnneeted relationbetween the -`friction 'in the respec to the `shaft and Vbasket for Y resiliently‘supporting vftivefsupports is ßan‘impor-tant ‘factor in the de isign'.' » '1. îIn Aa laundry machine, a 'spiïner'lbasketg fa vertical drive shaft forV the basket, »a Aiieiri'ble member of a material ïha‘vingïallow‘internalfric-~ the vbasket for tilting and »axial moveméntfwith respect tothe shaft, means resil-i'ëntlylsupporting Y »- ¿Forward îprec‘ession 4is also decreased by de thes'ha-ft for gyratory movement, saidïshaft-sup @signing fthe friction damper so 'that its lTfr-10131011 porting means bei-ng 4proportioned so that ythe critical lspeed :due to suchl means ‘is 4below the normal speed of the-basketr during y-cer'itfrifugal v>:dampr~ifn'g increases asr the basket tilts 'from the vertical; 'In Ythe >present construction thi-sffric ‘tiónnampingcharacteristic Íis obtainedby initially drying, a part »in which the shaft is journaled, :compressing 'the «rubber íring -`-|01 ‘to a point 'at and ¿friction Idarn-ping means_acti-ng throught-'said ‘part Y¿forv ïfrictionally vresisting -gyration _lofA the which'l its modulus of »elasticity increases. This means that the pressure <on ‘ itandfçaccordingly the f-fr'i'ctional resistance Lor shaft, - Y Y 1 „ =2. YIn a laundry machine, a spinner basket, fa " Y camping) is a -minimum when the masker is in 'vertical v'dr'iïve Ishaft for `the basket; means‘resili- ` 1 'the vertical position. By 'ltests VÍin which the «fric ently supporting the basketfor tilting “and axial tion ydamper was replaced ïby a >damper in which 45 movement relative to the shaft, means resiliently> fthe ìfriction damping ‘was a `minimum when the supportingjthe shaft for «gyratory >movement,¿sa'ïiìi shaft supporting’means -'being proportioned ¿so axis' of rotation» of the lbasket «was-tilted «from thewefrïtical, it ïhasfbeen found íthat »the basket ‘tended to assume vthe îpos'itionof‘ minimum -da-mp'f ingïand' that «objectionablewf'orward pre'cessi'on built- up. For a minimum of `'forward precession it isf-important that fthe friction damping vdoes not, increase toward the :cer-rter. l f' vÄìlïllfien fthereis beth preces'sion and unbalance, 'thereeis anaXía-l «force off haft ‘frequency- ‘tending 'tel-»move the basket up and I'downalongthe axis 50 that the critical speed vdu'e to such means ‘isbe -l'ówçthe ¿normal speed’of the Vbasket `during en@ v`trifugaldrying,a part in whichthe vshaf‘tis’jour naled, and ‘friction 'damping' `-means ` ‘acting through said part for >frictionally resisting'gyra tion of the sha-ft. y 3'. vfin a ‘washing “machin-e, ldriving lrnecl'raríisn‘i ` comprising Ya rotatable frame, a driving shaft ‘shaft frequency gyration »of the spinner basket about itsfaxïis of rotation is »superimposed »ilporî ljourna'led in ysaid framejmeans jfor Vselectively holding 'the frame "stationaryv or vcouplingr vthe 'driving‘s'haftto 'the‘frarna aspinn'er basket, 'shaft aixis'fo‘f' rotation. ThisY results Iin _af-variable dis» plac‘ement sha-ift frequencyof 4»the spinner 1basket ’Ír'o'm'fth'e Vpos'tion ~of perfect balance. having 'a minimum of internal friction'connected to the basket ‘and tthe -shaft means supporting fof rotation. F11-'his axial iorcelarise's when 'the theëlovv 'frequency >rotation or prec'essfion ofthe 60 means for connecting the frame vto `the spinner basket, Ameans comprising, ‘a flexible '-m'etalri'n'g From- another aspect-fthe angulariïty 4of the rlshaft the basket for tilting relative to-said shaft means', ` varies fat ‘shaiît freque'ríicy.` f lSincel either `the ary' member.; ‘means ‘connected lto -said `mernb'ejr‘in- nfi'us't‘ï‘V-aryr feach angular 'position-#of *the sha-ft, there is a resulta-nt up :and «down or axial force which",y unles‘s‘ycus'hioned; wouldresn‘lt in »ob-Y jectionable »vibration.` lforce `lis' 'partial-ly cushioned bythe agaisenniay Offrire ring' »261. in the `present machine the natural 'frequency ‘of the' basket Von the ring‘zsiisióf thecrcer (5f-20o Iovif ’the normal ext?actinglspeed 'of’120'0 R; P." M. a. tub> surrounding the spinner basket, la station cluding> a sleeve `in which 'the shaftv means> >is ‘journaled for supporting ‘the 'shaft means, spin-V ner 'basket and ‘frame'on said stationary ‘member to permit >'gyratory movement relative >to ‘the tub; and friction daml'ïîng ,meansI between lsai'd„_1as't means .and the stationary member for friction; ally resistingfthfegyratory movement; j, .A _ " 1n 'a Washing machine, a spinner1ba'skîeät;Á „a support 'having an upwardly presented spherical 2,406,226 friction surface, a vertical sleeve having its lower ' end depending around and seated on said surface whereby tilting of the sleeve is frictionally re sisted, spring means holding the lower end of said sleeve against said spherical surface, said spring means having a modulus increasing with the deflection of the sleeve from the central po sition, and a shaft journaled in said sleeve rotat 10 tionary member for frictionally resisting the gy ratory movement. » 6.`In a Washing machine, driving mechanism comprising a rotatable frame, a driving shaft journaled in said frame, means for selectively holding the frame stationary or allowing it to be coupled to the driving shaft, a spinner basket, shaft means for connecting the frame to `the spinner basket, flexible metal spring means hav 5. In a Washing machine, a driving mechanism ing lovv internal friction connected at spaced > comprising a rotatable frame, a driving shaft points to said basket and said shaft means and journaled in said frame, means for selectively extending radially from said shaft means, Where holding the frame stationary or coupling the by the basket is supported for tilting and axial driving shaft to the frame, a spinner basket, shaft means for connecting the frame to the spinner 15 movement relative to said shaft means, a tub surrounding the spinner basket, a stationary basket, a joint connecting the basket to the shaft ably supporting the spinner basket. means comprising flexible arms of a material hav member, means connected to said member in- ’ cluding a sleeve in which the shaft means is ing a low internal friction, a tubsurrounding journaled for supporting the shaft means, spin the spinner basket, a stationary member, means connected to said member including a sleeve in 20 ner basket and frame on said stationary member to permit gyratory movement relative to the tub, which the shaft means is journaled for support and friction damping means between said last ing the shaft means, spinner basket and frame means and the stationary member for friction on said stationary member to permit gyratory ally resisting the gyratorymovement. movement relative to the tub, and friction damp ing means between said last means and the sta ARTHUR L. KIMBALL.