Патент USA US2406150код для вставки
Aug- 20, 1946. v. c. KENNEDY 2,406,150 POWER UNIT ‘Filed May 25, 1942 5 Sheets-Sheet 1 Aug-.20, 1946~ v. c. KENNEDY ' POWER UNIT 2,406,150 ’ ~ Filed May 25, 1942 v5 sheets-sheet. 2 " A52 [@241 /22 /6.5 I 3675 36 35 50 36 50 $302 37.4 316 25 5/ 57.6 42 A52 ‘ "3775 ‘ Aug. 20, 1946. v. c. KENNEDY 2,406,150 POWER UNIT Filved May 25, 1942 5 Sheets-Sheet 3 . hli -gm HIS ATTORNEY 7, I Aug.‘ 20, 1946. ' - V. C. KENNEDY' - ~ 2,406,150 POWER UNIT Filed May 25, 1942' 5 Sheets-Sheet 4 Aug; 20, 1946. v. c. KENNEDY 2,4069150 _ ‘POWER UNIT > ‘Filed May 25, 1942 5 Sheets-Sheet 5 /a/ 37A f9” 35 v3 /53 INVENTOR. / Patented Aug. 20, 1946 2,406,150 UNITED STATES PATENT OFFICE. 2,406,150 1 POWER UNIT Verne 0. Kennedy, Evanston, Ill., assignor to A. F. Dormeyer Mfg. Company, a corporation of Illinois Application May 25, 1942, Serial No. 444,314 10 Claims. (Cl. 172—36) 1 2 , The present invention relates to food mixers and has for one of its objects the provision of a power unit which can be used in a plurality of styles and designs of food mixers and which can be tested and inventoried without thought as to a construction wherein all the ‘parts are made preferably of die stampings to reduce the weight of the device and provide a construction which is much stronger for the volume of metal used. the food mixer design in which any particular motor is ultimately to be used. Another object of the invention is to provide a food mixer construction wherein all parts of Certain features of the invention are related to and constitute improvements over the con struction disclosed in the co-pending application, Serial No. 316,758 of Alfred Strauss and Lee S. Tucker, ?led February 4, 1940, for Food mixers, reference to which is hereby made. Certain other features of the invention relate the power unit are open directly to a bath of circulated air on all sides inside of an outer cas 111g. 10 Another object of the invention is to provide a food mixer wherein the cooling of the motor is had in a new and improved manner. more particularly to the manner in which a prime mover, such as a fractional horse power motor, for instance, is constructed in a new and novel Another object of the invention is to provide a new and improved construction and. arrange ment for mounting the power unit within a fin ishing shell of a food mixer. manner. One of the objects of the invention is to pro These being among the objects of the inven vide a ‘new and improved method of supporting tion, other and further objects will become ap the armature and stator cores of a prime mover, 20 parent from the drawings, the description relat and further, the provision in connection there ing thereto, and the appended claims. with of a new and improved power unit for food Referring now to the drawings, mixers, including preferably a speed reduction Fig. 1 is a side elevational view of a food mixer transmission formed preferably as a part of the embodying the present invention with the view prime mover although the preferred embodiment 25 partly 'cut away to show the manner in which of the invention illustrated may be used in any application employing an electric motor with or without the transmission shown. the power unit is mounted upon a support; Fig. 2 is an exploded view of the elements in volved in securing together the upper shell to the lower shell of the power unit housing shown in Another object of the invention is to provide an improved food mixer made up of main assem 30 Fig. 1; bly units such as a shell, transmission and motor, Fig. 3 is an assembled view of the parts shown which units in turn are made up of unitary sub in Fig. 2; assemblies capable of being tested and adjusted Fig. 4 is a section taken upon the line 4-4 of independently of one another prior to ?nal as Fig. 1; sembly. Fig. 5 is a vertical section taken longitudinally In the conventional construction of food mixers through the power unit in Fig, 1; aside from the application referred to, the motor cannot be tested until ?nal assembly of all the parts hasvbeen made. In the present construc tion the motor or the gearing can be test run ' Fig. 6 is a section taken upon the line 6-6 of Fig. 5; ‘ Fig. 7 is a section taken upon the line 1-1 of Fig. 6; separately with all parts exposed for adjustment to eliminate roughness of operation before the motor is placed in the assembled device. Fig. 5; - Another object of the invention is to provide Fig. 5; Fig. 8 is a section taken upon the line 8-8 of . Fig. 9 is a section taken upon the line 9--9 of an improved motor construction which includes Fig. 10 is an enlarged view of the brush holder an improved bearing and brush assemblies and illustrated in Fig. 8; an improved brush mounting. Fig. 11 is a section taken upon the line ll-ll A further object of the invention is to support of Fig. 10; _ the two magnetic moving ?ux generating ele Fig. 12 is a, perspective view of the unit support ments in non-rigid or ?oated suspension. 50 ing the rear end of the armature shaft; A further object of the invention is to dispose Fig. 13 is a perspective view of the ba?le asso all torque affected parts of an electric motor ciated with the construction shown in Fig. 12 by upon two rod members which yield transversely which the circulation of cooling air in the mixer of their length. is controlled; _ A further object of the invention is to provide 55 ‘ - Fig. 14-is a longitudinal enlarged section taken 2,406,150 3 4 of the construction shown in Fig.12 with the baffle shown in Fig. 13 associated therewith; spring ?ngers 52 has a detent 53 therein which Fig. 15 is a section taken on the line H's-l5 in Fig. 14; Fig. 16 is a view in part of a modi?cation of the bearing support unit shown in Fig. 8; Fig. 17 is a side view of the construction shown engages in a longitudinal slot 54 upon the bear ing 4| to prevent relative rotation between the bearing 4| and the end member 38. A U-shaped bracket 55 more particularly shown in Fig. 4 is preferably secured to the end mem ber 38 by the bolts 36 to encompass the rear end of the armature shaft 561to provide support for A , it against end thrust. The end thrust'is borne Fig. 18 is a view similar to Figs. '8 and 16 show. by means of a bearing relationship existing be ing a second modi?cation of the brush carrier; tween a steel ball 51 swaged in the end of the Fig. 19 is a side view of the construction shown shaft 56 and a thrust pin 58 press ?tted to the in Fig. 18, and bracket 55 in an opening 60. Fig. 20 is a vertical sectional view of the pre 'In addition'to the bearing retainer 48, rivets ferred embodiment by which the prime mover is 15 50 are .also employed to secure a bracket 6| to mounted with respect to the shell. the end member 938 to provide a support for the Referring now to the drawings in further detail, weight. of the motor at the rear end thereof, this the power unit 29 is shown disposed in its hori bracket being bent at its outer end as at 62 at zontal working position as mounted upon a sup a point and at an angle suitable to engage and port 2| to overhang a bowl 22 that rests in a turntable 22*. The turntable is pivotatlly mounted 20 follow the contour of a supporting element which in this particular case is ‘the - casing -3l.> The as at 24 and the lower end of-the support 2! is in Fig. 16; rig/idly‘secured to albase 25 in a~suitable man ner_. vWhen in its working position, the heaters 26, preferably interdigitating, are disposed in the casing and bracketmay be secured-together by dle 2'! is secured to the power unit as more par The rivets 5 also secure to the rear member 38 an air de?ector 89 upon the front face-of the a machine screw .BBithreaded into the'braeket as at 54 although the preferred .embodimentwa re bowl 22 to agitate the contents thereof. A han 25 silient one, is discussed in connectioniwith Fig. 20. ticularly described herein for purposes of ma nipulating the power unit onor off the support 2|. At its front end the handle ‘21 is shortened bracket 38. Air passagesBS areprovided through and so contoured as to provide clearance for a ~ the central portion to admit air from'therear‘iof the end member 38 to the blades‘of the‘fan-and juicer bowl shown in phantom 29 to be received an outwardly forwardly . flared bell-shaped por upon the power unit when it is desirable to use POWER UNIT tion 68 is provided as by a die‘ drawing operation to cooperate with the fan-B1 upon the armature shaft 56 to force the fan blast forwardly and around the motor parts. The power unit 20 comprises a prime mover 28, a ‘transmission 30 and a shell '3l shown in shown in Fig. 13, is provided with an opening ‘H1 therein to be received upon thebell-shaped por~ the power unit as a juicer for citrous fruits or the like. Fig. 4, the handle 21, a governor switch 32, the heaters '26 and preferably two‘ downwardly ex tending parallel flanges 33 spaced from each other to receive the top of the support r2! between them, it being appreciated that a single heavy flange received in a slot could serve also. Prime mover A cardboard member 68,-asmore particularly tion- 65, and the-marginal edges‘ of the cardboard 53.8 engage the inside of the outer shell to; provide a barrier preventing circulation of‘ air around the edge of thebell E16 and-back through the opening 65-to the fan ‘68. Preferably, the cardboard :68 is located in the housing where, mechanically 45 speakingif it'ten'ds to move in oneidirectiomit Briefly stated, the prime moverin turn com prises astator 34 and a rotor or armature 35 wedges itself against the bellportion 66,»while if it movesin the opposite direction. it wedges itself against the outer shell, therebybeing held-rigidly supported'with respect to each other'in opera in place with no further pressure upon. itithan tive position by bolts 36 and spacer sleeves 31 50 the’ air which'it controls and'its inherent adapta secured to spaced end members 38 and 40. ‘For bility. Thebarrier being cardboardpermits as purposes of convenience, end member 38 will'be sembly line tolerances-without rattles in the prod hereafter referred to as the rear member and the end member '40 referred to as the front mem ber. ‘ ' ' Self-aligning armature bearings are mounted in an improved way in the end members and'a uct. Around the pening ‘[0 of ‘the cardboard ‘68, ?ngers ‘H are provided by which initial assembly of the cardboardrcan ‘be had and=the Cardboard held in place upon the bell=~65until the shell i3l brush carrier 42 is also carried by the bolts and can be mounted in- place. ‘ spacers where the brushes 43 may cooperate in To the extent that the rear end‘memberhas the usual manner with the commutator 44. 60 been described herein, regarding the structural 7 As more particularly shown in Figs. 12 and 14, characteristics of the self-aligning ‘bearing :4! the end member 38 is a stamped plate which has and the‘ retaining spring ?ngers 5|, the SEIfrH-HQ'H a central opening 45, laterally spaced openings 1&6 to receive the ends of the bolts 36, and arcu ing bearing in the front end memberdll is identi cal, like parts being referred to-by the same nu ate perforations 4? which allow for the passage 65 merals. These bearings'are self —,1ubricating, being of air through the end member. made. of a porous metal, and a felt wick l2.~being The bearing 4| has a preferably spherical or provided as held in contact with‘thebearing by rounded contour over a portion of its outer sur the spring ?ngers 5|. Oncethe-wick is saturated face? which portion has a greater diameter than with oil the lubrication of the-‘bearing is'main the opening 45 SQ‘that the bearing can be dis 70 tained for-long-periods ofservice. posed to rest and be supported in the opening .Referring'further to the front end member,;,as 145 where it is held in place by (a stampedlre tainer 4B riveted to the end member 38 as .at 55. The retainer has spring ?ngers 5| which hold more particularly shown-in Fig_~7, .a support :13 is formed integrally therewith to serve in" the same capacity as the support 6| just described. The the bearing member 4! in place andlone of the 78 support ‘[3 likewise is bent at an angle at its lower 2,406,150 5 end and may engage and be secured to the ‘inner surface of the housing 3| by a screw 14, the pre ferred form for securement being, however, the resilient one described in connection with Fig. 20. The front end member 40 preferably carries the transmission 30 to which it is secured rigidly as by rivets 15. The front end of the armature shaft 56 is cut to'provide a worm gear '16 upon the end thereof with the diameter of the gear preferably no greater than thediameter of the shaft so that 10 the ‘end is disposedwithin the transmission hous. ing after insertion through the bearing, . It is preferred that the supports 13 and Silicon‘ 6 tive support bet-ween vthe stator. and armature is the rods:3B and end members, and these rods an'd'end members are preferably made of' steel capable ofjresilient yielding to a limited degree, in the present invention, permitting relative movement among the assembled members to any degree according to design. This latitude can be varied by varying the diameter of the sleeves, larger diameters stiffening the suspension and smaller diameters increasing'the relative ?exing. By way of a further understanding of the novel advantages and improved results provided by this construction», such ‘factors are involved as=£the axes of relative rotation, the dynamic center of 15 balance, viiexurd-high speeds and vibration; "At 13 at the front end as more particularlyshownv high speeds'; a rotating part, if preserved in oper in Fig. 6, andv one at the back to provide a three ating position, tends-to revolve around its center point suspension support for the prime mover and of mass or develop'a dynamic balance under speed stitute the sole support of the prime mover and transmission, there preferably being two supports transmission. ' . v 1 Referring to 'Fig. 20 in" this connection, the 20 preferred manner of securement is shown where in a rubber sleeve 59_is received over a bolt 630, which could be used in place of bolts 63 or 14,1 and three preferably identicalrubber washers 69 re ceivedthereon alternately with metal parts 6| and, 3| and metal washers 19, The metal washers 19 are preferably thin and made of a ductile metal such ,as aluminum to be deformed around the which might not otherwise exist statically. . y In the manufacture .of'motor armatures un balance is continually encountered from a manu facturing viewpoint. This unbalance, wherever it exists, creates a strain thatresults‘in'a stress upon the system. ' I . ‘~ Where rigidity is present, as in‘conventional motors, the stressis concentrated “and i. propor tionately high, the system sometimes being unable to withstand it, either from a vibration viewpoint head of the bolt and the nut 89 when-tightened as the a mechanical present invention failure item. ‘the stress ‘ is-at'a a ' I ' Ymini to prevent loosening. This provides a ?oating and 30 orIn resilient mounting for the motor ‘which allows mum for any given 'strains'since the whole-sys and accomplishes a working flexure in the motor tem distributes the stress Widely Withinthe tol construction and, betweenthe motor and shell erances permitted mechanically between relative as further describedlater. . . Referring again to Fig. 4, it will be seen that the front and rear end members are secured in spaced and supported relationship by rods 36 upon which the stator 34 and the brush holder 42 are mounted. . 1 , The rods 36 are threaded as at 16. to the front end member and project rearwardly, parallel with each other, preferably in a horizontal plane. Spacers 31a comprising short sleeves are then slipped on the rods 36 followed by the brush sup port 42,'then a second set of spacers 312), then the stator 34 of the usual design is slipped in place upon the rods 36 where the rods 36 extend through die punched coincident openings?" in the laminations making up the stator stack. Thereafter, sleeves 310 are slipped over the rods 36 and the rear end member along‘ with the U'-shaped bracket 55 are secured in place by nuts ‘[8. The bolts 36 are threaded as at 80 on their ends to a su?icient length to permit the nuts 18 to be tightened down to provide a ?rm clamping relationship between the sleeves 3'! and the end members. a 1 ' It will be appreciated that the length of the sleeves are so determined that the parts are dis rotating parts. The whole system best shapes it self to best resist the ‘stress placed upon it. i The armature seeks a dynamically centered working characteristic, influenced somewhat by the cen tering effect of the balanced magnetic ?ux,~and, through the resilient supports illustrated in Fig. 20, the ?exure provided by the rods 36 and end members 38 and 40 combine and the motor in op eration gyroscopically and otherwise seeks ‘its harmonic balance of operation. ' Thus, being freed of low frequency vibrations the system dev rives'a‘rising' speed characteristic resulting in _ higher speeds and higher torqueratings and fur thering these results the resilient mountingsypere mit freedom to the static mass to absorb cooper Y atively much secondary vibration. ’ ‘ As will‘ be seen, all-the parts are exposed and can be contacted directly with detectors while the motor is running to determine the balance ‘of the system and the relative degrees of balance con tributed or not contributed by the several parts.v In fact, the motor can be run exposed for test purposes as mounted in the shell ‘of the ‘mixer. Furthermore, this particular construction ex‘-v poses all working partsfor'adjustment while the is being test run, it being possible where posedv in proper Working position, namely, the 60 motor tolerances between the rods 36 and the openings stator 34, where it will cooperate properly with in the end ‘members are not too close, to loosen the armature and the brush holder 62 where the the nut 18 while the motor is running‘and shift brushes 43 cooperate properly with the commu the rods sufficiently one way'or another to estab tator 44, although, as shown in Figs, 16 to 19, the lish "perfect concentricity between the armature sleeves 37a and 31b may be one, and the brush and the ?eld core. Not only this, but the motor'is carrier slidable thereon for adjustment. I safe to handle, the bell-shaped portion 66 serving » It'has been customary heretofore to support the stator of electric motors rigidly in a shell en gaging the outer surface of the stator whether as a shield for the fan when one might be han-' dling the prime mover while it is running.‘ Brush carrier unit bolts were used to hold the stator against longi 70. tudinal displacement or not,.the,theory being 1 Referring to Fig.8, the brush carrier comprises quite prevalent in conventional constructions that‘ a sheet metal member 8| of suitable contour hav the 1‘elative position of the stator and armature ing insulating members .82 ‘secured thereto at should be rigid. - y- a . I - , , In the present invention, the sole ‘means-‘of rela spaced points by rivets 83 and by the rods 36 throughcoaxial-holes 84. The sheet member is 2,406,150 7 8 out out as at 85 to clear the commutator 4.4 and as at 86 to clear any contacts between the brush supporting elements 88 and the sheet member 81:. tiposition switch 32 comprising an arcuate con! tact I02 mounted upon an insulating member I03 upon one side of a shaft I04 secured thereto, and As more particularly shown in Fig. 11. the contact buttons I05 on the opposite side of the shaft bridged by a switch member that intercon nects the arcuate contact I02 and any one of the buttons I05 depending upon the relative roe .90 extending through perforations 8| in the in, tation of the shaft operating the bridge, which operation is accomplished by a handle I01. The sulating member 02 beyond which the ears 00 are bent over to secure the channel members 88 10 buttons I05 are connected with leads I08 which tap the ?eld windings of the stator 34 and whom rigidly- in place. ever the switch MI is located to the rear of the As indicated in Fig. 10, the sides of the channel brushes 8‘! are square and to mount them, the supports are made in the form of rectangular channel members 88 which have marginal ears members 88‘ are upset as at 82 to provide detcnts cardboard member 88, the cardboard member, and. a U-Shhpcd spring member 93 is slipped over as shown in Fig. 13, is cut away as at II 0 to per the outer end of the channel member to compress 15 mil: the leads I08 to pass therethrough (see Fig. 9) to the ?eld coll. and; hold the brush spring 941 in. position, open As shown in Fig. 5, the switch IN is secured lugs 85 being provided in the arms of the U by a bracket III to the shell. 3|. This particular shaped member 13 to interlock. with the detents 92 in spring pressed relationship to secure the arrangement is suitable for the mixer construc~ Ueshaped member 93 in place against longitudi 20 tion as shown, but where the prime mover 28 is to be used in other applications, it is preferred nal displacement. The base 91° the U-shaped that the switch be mounted upon a bracket such member is inwardly offset as at 98 to engage with as III which is secured to the rear end member in the opening of the U-shitDed channel member 88 to prevent relative lateral displacement. 38 in a manner similar to the bracket BI, which With this construction, the brush and spring 25 arrangement would facilitate test block running assembly can be readily slipped in position and of the prime mover before it is assembled into held in place by an inexpensive and simple de a device such as a food mixer. vice, the ends 91 of the U-shaped bracket 83 being In some instances it might be desirable to em ploy a. centrifugal speed governor, in which case bent outward slightly to receive a tool by which they can be sprung free of the detent 9.2 when, 30 the bracket 55 is preferably employed as a sup porting means for one of the contacts of the'gov upon occasion, it becomes necessary to remove ernor switch, there being sufficient length pro them. The channel members 88 are preferably made vided upon the end‘ of the shaft 55 to receive a out of copper or brass to provide good contact and centrifugal element and a collar (‘not shown) to also so that wire leads 98 may be soldered thereto 35 operate the switch contacts. rigidly and permanently as at I00 to place the brushes and commutator in circuit with the wind— 1318s. of the ?eld. Transmission Referring again to Figs. 6 and 7', the transmis Referring to Figs. 16 to 19 inclusive, two modi sion housing comprises a lower saucer shaped ?cations of the brush carrier 42, namely 42a and 40 member I20 made of a sheet metal drawn to the 42b are shown where is seen in Figs. 16. and 17 shape shown, and preferably round at both ends the carrier member 8Ia has bosses I80 apertured with outwardly turned lips. I22 (Fig. 5.) at the to slide snugly upon the sleeve 31d and carrying rear marginal edges threaded to receive screws a lock screw [ill to hold the brushes in adjusted I23. The upper face. of the member I20 is ground position longitudinally of the armature. In 45 smooth to receive a flat cover I24 thereon in Figs. 18 and 19 a similar carrier is shown except sealed relationship, a metal to metal seal having‘ that the member Blb is provided with a circular been found to be suf?cient heretofore, although track I82 receiving a brush holder I83 rotatably a gasket may be provided if desired. The cover therein to locate the brush at the best point of I24 and the bottom I25 of the member I20 are commutation for the load expected of a par 5.0 perforated to provide openings which are con ticular otherwise standard motor, it being re-. centric with each other. Two openings I20 in membered one of the objects is to inventory the the bottom receive bearing sleeves I21 therein power unit regardless of ultimate use and then which have a reduced portion I28 whose upper make'the ?nal, adjustment when the. motor is end is upset outwardly as at I30 to secure the bearing sleeve I21 rigidly in place in grease sealed installed. More particularly in Fig. 16, the brushes may be supported like they are in Fig. 8 by channel relationship. members. In Fig. 16, however, another type of bearing sleeves I 21‘ to journal shafts I32 that receive the upper ends of the beater shaft 20. in drive relationship, the upper end of‘ the beater shafts I32 being cross kerfed as at I34 to receive a radially extending spring key I35 on the beater brush holder is shown which employs a threaded brush cap I83 on a sleeve swaged or inserted in diametrically aligned openings I84 machined in bosses I85. - Sleeve bearings I3I are press ?tted into the itself. The spring’ key releasably supports the I82 is externally grooved to be held in place by shaft against falling out of the shaft as well as set screws I86 which, when tightened, further 65. providing a drive relationship between the beater and the beater shaft. A spring I36 is. dis locks the carrier I83 in adjusted position. In posed in a groove I31 upon the shaft to'pre Fig..16 the brushes can be adjusted longitudie vent the beater being- inserted into the beater nally of the armature, different, stacks being In Fig. 18 the ?ange I89 journalled in the track v shaft beyond a, predetermined limit. readily usable with the same brush carrier, and, in Fig. 18, not only is the carrier longitudinally 70 The openings I38 and I40 in the top I24 per adjustable but brushes are adjustable also for mit the beater shaft to extend above the trans mission housing to provide a long engagement the point of commutation. between the. beater shaft and‘ the beater» for sup Speed governor port against lateral strains. The speed of the motor is controlled by a mul The opening I40 is enlarged to receive a bitter 12,406,150 10 support I4I press ?tted into place above the beat I1] , which cooperates with the upper end of the er shaft I32 where the kerf I34 can receive in drive relationship the shaft (not shown) of the reamer carrying a combination drive and latch spring similar to spring I35 upon the beater. The support I3I to adjustably locate the power unit in any predetermined position to determine the in the working position of the power unit. manner in which the juicer bowl 28 is mounted in the sleeve MI is indicated in broken lines I 42, As mentioned heretofore, it is preferred to have ‘the motor unit mounted upon the lower shell por depth the heaters 26 are lowered into the bowl tion at three points. It will be noticed that the forward points, see bolts 14, are proximate the 10 openings through which the shafts pass through upper end I44 upon the supporting sleeve I4I. the shell.’ Where resilient mountings are used, Two interengaging gears I45 are mounted. upon such as shown in Fig. 20, the resilient movement the shafts I32 to drive them in opposite direc of the transmission and motor at the front is not tions with another gear I46 upon one of the in any way permitted to allow metal contact be shafts meshing with the worm 16 upon the arma ture shaft 56. The rear wall of the housing I26 is 15 tween the shell and the heaters in operative po sition. Thus, the motor and transmission are apertured as at I41 to receive the forward end virtually an isolated harmonic system disposed of the front self-aligning bearing therein as at in a shell without metal to metal contacts, the I48 where it is in contact with the grease within teaching of the resilient supports set forth in the the transmission housing by which the bearing is kept. lubricated, the bearing serving as a closure 20 patent to Alfred Strauss et a1. 2,278,186 thus be ing carried, forward for resiliency between the for the opening, this construction being a novel there being a downwardly facing shoulder upon the juicer bowl support I42 which engages the ' construction in the particular relationship shown, Shell The shell 3I is constructed of two die stamped members preferably substantially identical in contour to save die costs and are joined margin ally together as shown in Fig. 2 by U-shaped members I52 holding a decorative molding I53 in place over the line of juncture I54 between the shell members and within the legs I55 of the U shaped member I52 that extend through marginal T-shaped slots I56 stamped in the shell members. shell and power unit as well as resiliency among the heaters, the center of mass and the support points. . Two longitudinally spaced bosses I12 are pro vided upon each side of the support 2I at the'top to engage the inner faces of the downwardly pro jecting plates or ?anges I61 to prevent the plate from scuf?ng the support and to align the power unit longitudinally and support same against lat eral displacement, the plates I61 otherwise'being shaped to follow into the contour of the support I2I in a manner pleasing to the eye. A pin I13 The legs I55 are so formed that their resting po is disposed transversely through the support be sition is normally divergent with respect to each low the bosses I12 and the lower edge of the plates other, so that after the ends are pressed parallel I61 are so cut in the stamping operation as to to be inserted through the, slots I56 they will provide a hook arrangement I15- which engages thepin I13, the hook being an upwardly opening again expand inside the housing when the U one at the end of a horizontal slot through which shaped member I52 is pushed home. The upper shell member I49 is perforated as 40 thepin I13 is slid as the power unit is moved rearwardly after the sides I61 have been lowered at I51 to receive the upper end of the juicer sup port sleeve MI and, by engagement therewith with or without a resilient washer (not shown) and guided into place by the bosses I12, This particular arrangement permits the re the two are held in mutually supported relation. Further perforations are provided suitable for the securement of the handle 21. In the particular moval of the power unit from the support in all illustration, a perforation at I58 receives a screw its working position in being tilted rearwardly, I66 that is countersunk into the handle and fas tened in place before the upper shell is assembled that moment and from thereon until the power unit is fully tilted back beyond the center of its with the lower shell. _ ‘ Furthermore, in the particular embodiment il lustrated, the switch is accommodated within the con?nes of the handle where it is protected from abuse or inadvertent damage, same being readily available for operation by one of the ?ngers of the hand holding the power unit. The‘bracket III is secured to the inner face of the upper shell I49 by being threaded to re ceive the inner ends of a bolt I6I as is more par ticularly shown in Figs. 1 and 5. The lower end I62 of the bracket I II serves also as a means for securing the two shells together and in combina tion with the lower shell the die stamped sup port element 33 is secured to the shell by means of the screw I63. - The lower shell is perforated at the rear as at I64 for the admission of air in a concealed way to the space behind the de?ector 64. The lower shell is also provided with outlet openings I65 at the front end to permit escape of the air after it has passed over the motor to cool it. At the front end of the support member 33 a cross member I66 is provided which engages the two side mem bers I61 of the support member 33 and is thread ed as at I68 to receive a, bolt I10 and a lock nut positions except the working and fully tilted po sitions. The moment that the power unit leaves 50 weight, the power unit may be removed by an up ward or forward movement addressed to the handle, whichever is appropriate as will be ap parent from a study of the drawings. In this, way, a new and improved support arrangement is provided which is readily adjustable underas sembly conditions and can be easily manipulated by persons using the mixer who are unskilled me chanically. - , Although the description of the present inven tion has been lodged in terms speci?c in detail for a better understanding of the embodiment vil lustrated, it will be readily appreciated that suit able variations will be evident to those skilled in the art from the description made. Consequently, although a preferred embodi ment and several modi?cations of the invention have been suggested and described herein it will be apparent to those skilled in the art that vari ous and further uses, modi?cations and changes may be made without departingfrom the spirit and substance of the invention, the scope of which is commensurate with the appended claims. What I claim is: 1. In a food mixer a power unit comprising a, transmission housing, an armature journalled 2,406,150 11 at one end on the transmission housing, a mem ber spaced from said transmission for journalling the other end of the armature, elongated ele ments interconnecting said transmission and member in supported relation, a stator core car ried by the elongated elements, a brush holder carried by the elongated elements, a shell sup porting the transmission and the spaced mem her at spaced points, a de?ector carried by said spaced member, an air bailie in said shell clos ing the space between the de?ector and shell, and air circulating means driven by the armature and disposed within the de?ector. 2. In a food mixer a power unit comprising a transmission housing, an armature having one end extending into said housing and journalled in a bearing supported on the housing, a member spaced from said transmission housing and se cured thereto by interconnecting pins or the like, means for journalling the other end of the ar mature upon said member including a self-align 12 to the end members at substantially diametrically spaced points on each of the members and con stituting the sole support of the stator core on the end members in torque absorbing relationship 5 with respect to the armature, said rods being capable of ?exing appreciably under the relative torque developed between the armature and stator core. 7. A food mixer power unit comprising a trans mission housing, an armture journalled at one end with respect to the transmission housing, a member spaced from said transmission housing for journalling the other end of the armature, a stator core cooperating with the armature, a pair of resilient rods or the like interconnecting said transmission housing and member in supported relationship and carrying said stator core, said rods constituting the sole support of the stator core and being capable of ?exing appre ciably under the relative torque developed be tween the armature and the stator core, a cover ing bearing mounted upon said member, a stator enclosing the transmission housing, the arma core secured in place by said pins and supported ture and stator core including a shell, and means by the pins in operative position with respect to for supporting the transmission housing and said the armature, and a cover for said unit compris member at spaced points in said shell. ing a shell secured with respect to the housing 8. In a food mixer power unit the combina and said member, means for dividing the cover tion of a shell, an armature in the shell, a stator and the two compartments including a- deflector core in the shell, spaced members mounted in for directing air against a stator and armature, the shell each directly to the shell at spaced air circulating means for moving air from one 30 points, means for supporting the stator core upon compartment to the other under the control of the spaced members including resilient elements said de?ector, and said cover having openings in carried by the spaced members and constituting both compartments proximate the transmission the sole support for said stator core, a transmis in one compartment and beyond the said spaced sion comprising a housing secured to one of the member in the other compartment. members and driven from the armature, ver 3. In a food mixer a power unit comprising tically disposed bearings in said housing, power an armature, a stator core, die formed members delivering shafts journalled in the bearings and bearings carried by said members for journalling accessible through openings in the shell, gear said armature, shafts interconnecting said mem means for driving the shafts from the armature bers and supporting said stator, a transmission by which the torque of the armature is delivered mounted upon one of said members, brush hold to the power delivering shafts, said resilient ele er means mounted upon the shafts, and means ments being capable of ?exing appreciably under upon the other of said members for supporting the relative torque existing between the armature the armature against end thrust, and air cir and stator core. culating means carried by said armature. 9. A motor construction comprising supporting 4. In a device of the class described, a pair of means, two spaced members characterized by spaced members interconnected by supporting elements, an armature journalled in the spaced members, a stator supported on the supporting elements, said armature having a commutator disposed at one side of the stator, a third mem ber supported on said elements at a point spaced from the stator and proximate said commutator, diametrically arranged insulating elements on the third member, U-shaped channel elements being disposed substantially parallel with each other. and each held in supported relation upon the supporting means, an armature supported in journalled relationship between and upon the members, a stator core, and resilient means interconnecting said members and constituting the sole support for the stator core, said resilient means being capable of ?exing appreciably- under 55 the relative torque developed between the armahaving detents on their sides secured exclusively ture and the stator core. ' upon the elements to support brushes therein, 10. In a power unit comprising two spaced end and a U-shaped spring element received in sup mmbers, elongated resilient elements intercon ported relation on said channel elements in en gagement with said detents for closing the outer 60 necting the end members in supported relation ship, bearings carried by the end members, an end of said channel members. armature journalled in the bearings; a stator 5. In an electric motor having a rotor and a core carried solely by the elongated elements, said stator, two unitary assemblies journalling the elements being capable of ?exing appreciably rotor, rods or the like interconnecting the as under the relative torque developed between semblies in supported relation and supporting the the armature and the stator core, a covering for weight of the stator, a carrier slidable upon the said unit comprising a shell enclosing the stator rods including means for locking the carrier in core, the armature and said elements, means for place upon the rods, and a brush holder and mounting the covering on the unit with space means for rotating the brush holder with respect to the carrier to place the brushes at the best 70 between the shell and stator core, and air circu lating means driven by the armature including an point of commutation. element for directing cooling air over the stator 6. A motor construction including two end core between the core and the shell. members, self aligning bearings on the end mem bers journalling an armature, a stator core, a pair of resilient rods secured at opposite ends 75 VERNE C. KENNEDY. .