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Патент USA US2406150

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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. .
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