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Патент USA US2412473

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Dec. 10, 1946.~
2,412,473
E. |_. SCHNOEBELEN
DYNAMIC AND STATIC BALANCING MACHINE
\ Filed May 14, 1940
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Dec. 10, 1946.
E_ |_, SCHNOEBELEN
2,412,473 2
DYNAMIC AND STATIC BALANCING MACHINE
Filed May 14, 1940
2 Sheets-Sheet 2
EARL L. SC'HNOEBELEN
3mm
Patented Dec. 10, 11946
2,412,473
UNETED STATES PATENT OFFICE
2,412,473
DYNAMIC AND STATIC BALANCING
MACHINE
Earl L. Schnoebelen, Rock Island, Ill.
Application May 14, 1940, Serial No. 335,167
1 Claim.
1
This invention relates to static and dynamic
balance machines,
The primary object of this invention is to pro
vide a machine for accurately determining the
(CI. 73-66)
2
.
of the arrows, showing the indicating means for
determining the location of unbalance in a piece
of work being tested;
Figure 5 is an enlarged fragmentary view of
the micrometer adjustment for the visible signal
static and dynamic balance of rotating bodies
such as crankshafts, armature shafts, drive
indicating device contacts;
,
shafts and any rotating member where static
Figure 6 is a fragmentary view, partly in sec
and dynamic balance is a determining factor of
tion, illustrating an adjustable contact for one
the smoothness of operation in the machine in
of the rotating body supports;
' , '
which the rotating body is used.
10
Figure 7 is a diagrammatic View of the circuit
A further object of this invention is to provide
wiring for the balance machine, showing the
a machine of the above mentioned character in
manner in which the unbalance position deter
which the supports for the rotating body are sus
mining indicator is connected with the contact
pended and are capable of an oscillatory move
devices;
'
ment which movement when caused by an un 15
Figure 8 is a side elevational view of one of the
balanced rotating body, may be determined and
rotating body supports, illustrating the bearing
the exact location of the unbalanced portion of
member therefor;
'
the rotating body is easily indicated upon a syn
Figure 9 is a vertical cross sectional view taken
chronous indicator.
on lines 9—-9 of Figure 8 looking in the direction
A still further object of this invention is to 20 of the arrows, illustrating the structural details
provide a machine for determining the location
of the bearing member for supporting the work
of off center of a rotating body and simulta
being tested, and
'
neously indicate in fractions of an inch the
Figure 10 is an end elevational view of a modi
amount of off center or dynamic unbalance so
?ed work support which may be used in lieu of
that the rotating body can be corrected to com 25 the work support in Figures 1 to 9 inclusive.
pensate for the amount of off balance.
In'the drawings, wherein for the purpose of
A still further object of this invention is to
provide a machine of the above mentioned char
acter in which an electric indicating means is
illustrating the invention and wherein like refer
ence characters will be employed tov designate
like parts throughout the same, the reference
character I0 will be employed to generally desig
employed for determining the location of the
dynamic unbalance in a rotating body by caus
nate a machine base, formed from a pair of
ing a visible spark indication to occur on a posi
parallel U-shaped angle irons I2 extending the’
tion meter corresponding to the position of the
rotating body supports as a result of unbalance
in the rotating body.
A still further object of this invention is to pro
vide a combined dynamic and static balance ma
chine in which the supporting members for the
work to be tested are capable of adjustment to
the testing of rotating bodies of various dimen
entire length of the machine.‘
sions.
Other objects and advantages of the invention
will become apparent during the course of the
following description taken with the accompany
ing drawings, wherein:
Figure 1 is a longitudinal side elevational view
of the dynamic-static balance machine;
Figure 2 is an end elevational view illustrating
the drive means for causing rotation of the work
being tested at predetermined speeds;
The side parallel frame bars I2‘ are connected
; at one end by means of a vertical shaft support
l4, having an outwardly flared base portion l6
adapted to rest on the upper edges of the angle
bars [2. Secured to the underside of the verti
cal shaft support is a plate I8, having the edges
chambered as at 28 for receiving the inturned
edges of the angle bars [2. Bolts 22 extend
through the plate l8 and have their threaded
ends anchored in the base of the vertical shaft
support I4.
Rotatably mounted in the upper portion of the
vertical shaft support M is a rotary shaft 24, on
one end of which is provided a pulley collar 26
having a series of V-shaped grooves 28 for re
ceiving a drive belt 30, trained over a pulley 32
50 mounted on the armature shaft of an electric
Figure 3 is an end elevational view of the op
posite end of the machine illustrating one of the
motor 34, the base of which as at 36, is Secured
to a table 38, having a boss 40 pivotally attached
rotating body supports;
to a bracket arm 42 as at 44 anchored to one
of the parallel side frame members 12 by means
Figure 4 is a vertical cross sectional view taken
'
on lines 4--4 of Figure 1 looking in the direction 55 of bolts 46.
2,412,473
Extending from the end wall of the vertical
shaft support I4 are a pair of ears 48 between
which is pivoted a lever 50 as at 52‘ and mounted
on one end of the lever 50 is a brake shoe 54
adapted to engage the pulley collar 26 and retard
the rotation of the shaft 24. The opposite end
of the lever 50 is connected to a link 55 by means
of a pin 58 and said link 56 is connected to
an arm 60 located on a stub shaft 62 journaled in
one of the parallel side frame bars I2. A hand 10
lever 64 is also attached to the stub shaft 02 and
is locked thereon by a set screw 66.
.4
close proximity to the vertical bracket arm I26
as at I40 and is held in a horizontal position by
means of a coil spring I42 attached as at I44,
while the opposite end is connected to an ad
justable screw I46 threaded in a projection I49
of the frame base IIO. A knurled thumb piece
I50 is formed on the adjustable screw to facili
tate the placing of proper tension on the coil
spring I42.
Formed on the opposite end of the pivoted
beam I 38 is a rotating body support I52 havingr
a- bearing I54 held in place and adapted to form
ab'earing for the work being tested. As shown
The opposite end of the shaft‘ 24 extendsibe
inqli‘igure 8, the pivoted beam is provided on its
yond the other face of the shaft support I4, as.‘
at 58, and is provided with an enlarged collar. 15 outer end with a split bearing member including
semi-circular sections I56 and I58 and the sec
‘I0 to which is fastened a disk ‘I2 having‘a pointer
tion I55 is formed as an integral part of the piv~
‘I4 forming one electrode of a spark gap‘ which‘
oted beam I38 while the semi-circular section I58
will be hereinafter more fully described. Co
is~ hinged thereto as at I50 and the free swinging
operating with the electrode pointer ‘I4 is- a
graduated disk ‘I5 fastened to the vertical shaft 20 end is clamped by means of a fastening screw
I62‘, extending through ears‘ I64 and‘ I65; carried
support? by means ofscrews ‘I8. The disk ‘I5 is
by the semi-circular members. I56; and‘ I58, re
providedf'with an annular ?ange 80, undercut at
spectivelyi
82 and graduated on its radial; face: with scale
markings 84: and 80; dividing the graduations
intotwosets' on theright and'left of: a vertical
diametrical center.
Asocket? coupling extension. 88 is provided on
th'eishaftYeXtension98;andisslotted as at 90 for
receiving one end of? coupling rod‘ 92 having a
spherical.v end: 94' provided“ with a transverse\ pin
Universallyv mounted. bearing. inserts I68 andv
I210’: are; mounted in the semi-circular bearing
members;l56' and I158, respectively. and each hear.
ing: insert is? provided: with a, centering’ pin I;'I2:'
andll'hl; extendingiintoslots I16 and I13: therein;
The; centering pin. I114. is provided with a‘ ?ange
I80 to prevent the’ insert‘ I101‘ from.‘ being dis
96. operating in. thecoupling. socket slots 00;
The: opposite-end ofthe coupling red 9213 also
spherically formed,.as"at 98, and is received in a
coupling socket I00, also slotted for receiving, the
pin“: I02rcarried by the'spherical'end member 93.
The: work to bertested‘is. received in a socket I04
placed.v
formed on the end of the socket coupling mem
beIT I00;
As shown: in Figure 6,- the movable‘ contact I02
is'slidably'mounted: in aplate; we. and is set in‘
an adjusted position by means: ofiadjusting'nuts
'
A: mpyable contact: I22‘ is.‘ adjustably‘ carried:
by'ea'ch pivoted beam suspension arm: I32 and‘
saidm'ovable :contact is threaded inthe lower end‘
of.‘ an. extension. I04 thereof, fastened in place
by‘the pivot bolt I35 and an: anchoring pin‘ I85.
The rotating body to be tested isrotatably
supported in' suspended bearings I06 and IE8 40 I90, threaded thereon;
Adjacent to the: movable: contact I82 is one
which are adjustably-movable longitudinallywith
end of: a hollow‘ screw'threadedirod' I94; which
respect to the side frame angle bars I21- and since‘
the suspended bearings are identical‘ inf con
structiom. only one will be: described in detail.
Each‘ of the bearing supports includes a frame
base portion I I0 adapted-to have its ends- rest on
the upper‘ flanges of the parallel frame bars I2‘
and‘ said base-is adjustably held in position by
means: of: a‘ clamping plate II2, the free". ends of
which: are; adapted to‘ engage under the upper
?anges’ of the: side frame bars I2; A clamping
bolt “4 is'carriedby the base I‘I0'and' extends
downwardly through the- clamping‘ plate I12 and
isprovided. on its threaded end, with a retain
ing nut: I I6. The opposite end: of the. clamping .>
bolt extends into. a. housing" H0’ formed: in the
frame base. H0; and‘ is provided with an eye' for
receiving‘ an eccentricsh'aft I20 journaled in the
housing‘ H8 and provided with a handle I22‘ for
is; threaded. in. a lug’ I95’ of’ an. extension I90
formed: integral‘ with' the; brace web I28; The
adjustable contact I92‘: is reciprocably mounted
in the hollow screw; threaded shaft. I94 and is
provided- with. a. slot 200- in one end thereof,
through-1 which. passes'an anchoring- pin 202, the
ends“ of. which. extend; into:- openings formed‘ in;
they hollow- rod;
A. coil‘ spring: 204: has: one! endv abutting the
adjustable contact member I02v while the op.
posit'e: end‘. abuts: against. a. plug: 205 mounted in
the-hollow rod; Located in the? adjustable con
tact member I92 is a plug 208 ad'aptedto contact’
with; they movable: contact, I82‘: when. the; bearing
support: I52; is. vibrated;
The‘ degree‘ of adjustment" applied to the hol-v
low‘ screw‘ theradedf rod: may be determined by:
rotating‘ the‘ shaft and causing the clamping. 60 means of a'. graduated sleeve 2'I0 clamped on the
plate‘ I'I2'to be drawn‘ upwardly so that the ends
will, clamp'the upper inturned ?anges of the side
frame members I2.‘ Guide pins I24 are‘ carried
by the frame base I I0 and extend through suit
able openings inthe clamping plate H2’.
Extending upwardly from. the frame base plate
II 0 is_ a bracket arm. I26 braced, byvv means of a
tapered web‘ I28‘; connecting the frame base and
bracket arm and formed on the extreme upper
end of. the bracket. arm. I25 is" a lateral extension.
I30.- Freely suspended from the lateral exten
sion, I30; to swing transversely of the balanced
machinejis a link I32, pivoted as at I34, and
having pivoted to its lower end: as at I30, a hori
zontal beam I38, one end of which projects in
upper end of the vertical bar 2I2 which is' at
tached‘tdthe.adjustableibase III) by any suitable
means;
Graduations 2:I'4 are marked on the
sleeve 2I0 which, align. witha series of gradua
tions 2I6 marked on a movable. sleeve 218 car
riedion' thev free end of the: hollow screw threaded
rod I94. Aknurled thumb piece 220'is attached
to: the reduced screw threaded portion 222' of
the hollow rod‘ I94. and an. annular bossv 224' is
formed thereon for limiting the threaded. move
ment of the. knurled: thumb piece.
Each of. the movable contacts I02‘; are grounded
electrically as shown in Figure; 7; while the,» ad~
justable contacts. I92 are; connected’ by lead-.wires
22B with.a:live:wire' 2282120 one side of'a high volt
2,412,473
5
age transformer 230. The opposite terminal of
vibration,‘the less the sleeve is turned ‘so the
the transformer is connected to a source of cur
rent such as a battery 232 having one pole
grounded as at 243. A contact switch 236 is in
points meet, therefore the sleeve reading will be
terposed in the lead line 238 between the source
of current and the transformer 230 and a lead
wire 242 connects the secondary winding of the
' transformer to the rotating pointer ‘I4.
greater.
.
Usually two corrective planes are .selected to
remove or add weight to bring the body in bal
ance. The amount is represented by each sleeve
on each end or side of the body. However, when
a body is out of balance excessively on one end,
a small amountof vibration will vary through to
A circuit is completed through the gap formed
by the rotating pointer ‘I4, and the disk ‘I6 by a 10 the other end. In actual practice, when this oc
curs, the end which shows the excessive amount
ground connection 244.
is corrected for balance, otherwise the amount
For a consideration of the operation of the
shown on each end is corrected according to the
balancing machine, it will be supposed that a
sleeve reading.
piece of work to be tested is placed in the bear
If the location of unbalance were in the center
ing supports I52 and is connected to the cou 15
of the body, .both ends would vibrate the same
pling socket’ I04. The motor 34 is then started
amount and show the same angular position of
simultaneously with the closing of the switch
unbalance. Corrections would be made on each
236. The starting of the motor will cause the
end, if there were no provisions for making cor
shaft or rod being tested to be rotated at the
desired rate of speed and should said rotating 20 rections in the center, provided the body was
structurally strong enough to withstand any dis
body be unbalanced, the movable contact mem
tortions. Otherwise corrections would be made
bers I82 will be vibrated, causing the same to
in the‘ center of the body.
>
move into engagement with the adjustable con~
In regard to sparks showing the amount of un
tact members I92, whereupon alcircuit will be
balance, in actual practice it has always been
completed through the ignition or transformer
found that minute amounts of vibration present
coil 230, producing in turn a spark between the
in the foundation or in the base of the balance
rotating pointer 14 and the undercut edge of the
machine, as small as .0001, would vibrate the
?ange 80. The vibration of the rotating body
will cause a spark to occur on the graduated
portion of the disk ‘IS in the same diametrical
points when brought together, provided the body
The amount of unbalance is shown on the grad
the arms and provide a rigid construction.
uated sleeve, Figure 5, which is connected to the
Extending between the lower ends of the sus
pended links 262 and 264 is a work supporting
cradle 268 having a ball bearing mounting 210
and being provided at its ends with wing exten
sions 212 for pivotal connection with the sus
is in perfect balance (otherwise the balance
would separate these points), and that these
location as the occurring vibration.
vibrations are so rapid, due to the high frequency
If the rotating body is dynamically unbal
of the base that almost a pattern of sparks is
anced, sparks will jump from the pointer ‘I4 to
given oil‘ the rotor pointer ‘I4, when the body
diametrically opposite points on the disk ‘I6 and
the occurrence of said sparks may be indicated 35 is in perfect balance. This feature is accepted
and desired by many users of this balance ma
by movable pointers 246 and 248, movable over
chine, who require a very accurate balance on
the opposite graduated portions of the disk as
small high speed bodies. If the sparking charac
at 86 and 84, respectively.
ter covered half the ground ring 80, this would
If the spark from the closing of both sets of
indicate a certain degree of unbalance. The an
contacts I82 and I92 occur in the same location
gular portion of unbalance would be in the center
on the disk ‘I6, the rotating body is statically un
of this spark character.
balanced and correction can be made in accord
In the modi?ed form of the invention shown
ance with the respective location on the dial 84
in Figure 10, there is provided a rotating body
or 86.
In the event that the rotating body being tested A support, one of which will be provided for each
end of the work, there being one shown for the
is both dynamically and statically unbalanced,
purpose of illustration. A base portion 250 which
correction can be made by noting the occurrence
corresponds to the base H0 in Figures 1 to 9 in
of the sparks on the dials 84 and 86 and when
clusive may be secured to the table by means of
crankshafts are tested, any number of suspended
a bolt 250 pivoted to the base in an opening there
supports I06 and I08 may be used.
of as at 254. Openings 256 are provided in the
Restated, it may be said that the body being
underface of the base 250 for receiving guide pins
balanced is driven through the ?exible drive shaft
similar to the ones shown in the preferred form
92, which is connected to the insulated motor
of the invention as at I24.
I4. When vibration occurs in the body (due to
Extending upwardly from the base 250 in par
unbalance) the contacts I82, I92 make and break 5
allel relation are supporting arms 258 having in
contact in synchronization with these vibrations,
wardly turned end portions 260 from which are
causing a spark to jump off the rotor pointer ‘I4
suspended pivot arms 262 and 264. Reinforcing
to the numbered ground ring 80, thereby show
web plates 266 extend between the base and the
ing the angular portion of unbalance on each
end of the body, each end being tested separately. (II) upright arms 258 to prevent lateral movement of
breaker point-s I82, 208 (see Figure 6) . The hol
low rod I94 is unscrewed or backed off at the start
of the balancing operation. From this outward
position, it is screwed in until the points just
contact. When the contacts are thus positioned
the spark will jump from the rotor pointer 14,
then the amplitude of unbalance is shown on
the sleeve, Figure 5, for this end of the body.
Then this sleeve is backed off and the same pro
cedure is followed on the other side or end of
the body. Thus the angular position of unbal
ance and the amount of unbalance for each end
of the body can be ascertained. The greater the
pending links 262 and 264.
Adjustably secured to the lower end of the sus
pended link 262 is a contact arm 214 held in place
by the nut and bolt connection 216 and an ad
ditional machine screw 218. The lower end of
the contact arm 214 is provided with a contact
280 which is adapted to be moved toward and
away from the adjustable contact 282. Formed
on the reinforcing web 266 is a threaded exten
2,412,573;
7
8
sion 284" which receives the adjustable; contact
shaft 282‘ which is provided with a micrometer
adjustment 285 similar to the adjustment‘ 220
shown in, Figure 3-.
The work may be positioned within the inner
nected to each cradle, said links being pivotaily
race member of. the bearing: member 210 and, ro
tated‘ by a chuck similar to- the chuck structure
M‘ or I04 shown in Figure‘ 1. The operation of
the modi?ed construction is! identical to that. as
connected to said supports to form a swingable
carriage for said body, means for rotating said
body,‘ a pair of electrical contacts, one mounted
upon each of said swingable carriages, a pair of
stationary cooperating electrical contacts re
spectively, juxtaposed with respect to said‘, ?rst
mentioned contacts, a low tension electrical. cir
cuit connected to said contacts whereby vibra
shown in the form of the invention described in 10 tory movement of said carriage makes and breaks
said low tension circuit, a high tension electrical
Figures]; to 9 inclusive.
circuit controlled by the rate of change of cur
It. is to be understood that the form. of the
rent in said low tension circuit, a synchronous
invention herewith, shown and described is, to be
indicating means rotatable substantially coaxiv
taken as a preferred embodiment of the same
ally with said body, said high tension circuit be.
and that various changes in the shape,.size and
ing connected through said indicating means
arrangement of parts. may be resorted to with
whereby breaking of the low tension circuit, pro.
outdeparting from the spiritvof the invention or
duces a visual indication on said indicating
the. scope of the subjoined claim.
means, and means for adjusting said stationary
I claim as. my invention:
contacts to cause a. pair of said contacts to com
A machine for determining the dynamic bal
plete the primary circuit only when said cradles
ance of a body in rotation which comprises a
vibrate at their maximum amplitude.
base, supports carried by said base, means for ro
tatably supporting a body which comprises a
EARL L. SCHNOEBELEN.
pair of cradles, a pair of rigid links pivotally con
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