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Oct 29, 1946‘
J. L. CREAGMILE
2,410,339
WHEEL ALIGNMENT GAUGE
' Filed Feb. 15, 1943
s Sheets-Sheet 1
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.WED-“HUME
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W2
INVENTOR
JOHN L. CREFIGMILE
ATTORNEY
Oct; 29, 1946,
2,410,339
.1. 1...‘ CREAGMILE
WHEEL ALIGNMENT GAUGE
.
Filed Feb.- 15, 1943
: Sheets-Sheet '2
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24
//
28
£413
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INVENTOR
BY
JOHN L. CRE?G/WLE
M71901”;
ATTORNEY
90t- 29, 1946I
J. L. CREAGMILE
2,41Q339
WHEEL ALIGNMENT GAUGE
‘Filed Feb. 15, 1943
3 Sheets-Sheet 5
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Patented Oct. 29, 71946
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1543, Serial Nil-Ifi75e9f15
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‘I {,4 ‘Gems
various aligmnent ‘relations of dirigible wheels of
my invention‘ includes _complementary}v screen
members vl0 ?xedly, positioned opposite and‘iout-l
vehicles.
WardIy ' of the" laterally Spaced ' dirijg'ible wheels ' H.
" The invention relates‘to a means for gauging
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"1 The'general object of the'invention' is to 'pro-_'
vide an improved and particularly‘simple device
and‘ I2 of avehicle‘having its said. wheels fsu'p-r
_ ported “for their fsteeringTswinging about i?xea.
for gauging such features 'asfthe camber, caster,
toe-in,’ and turning, radius of‘the dirigiblewheels'
light. beams horizontally toward the wheels in a
points," suitablellig'htc sources I3 “for directing
of vehicles while the wheels are mounted on the
common j line‘ which lies in a ‘vertical I plane
vehicles.‘
through ‘or immediately adjacent’ the support
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'
" 1A- morev speci?clobject is ,to ,provideia" par
ticularly’ simple and e?ectivedevice for utilizing
a‘beam of light in‘e?ecting the "aforesaid‘gaug
ing operations, the device comprising‘ an optical
10 points ‘of the wheels and complementary re?ector.
' sets remov'ably mounted upon" the different wheels
in de?nite relations thereto and havingre?e'c-l'
tors thereof arranged to be selectively interposed
in ‘the'be‘a'm lines in accordance 'with'the dis-Y
- A further object islto provide'a. simple and ‘eff 15 positions ‘of’ the wheels to re?ect the intercepted
beams upon scales provided on the opposed faces
fectivve 'means for'rnounting a reflectorof the
‘apparatus upon wheels beingj gauged for, their
alignmentrelations;
‘
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V
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I
of the‘ corresponding screen's l0;
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' 'Each'present'scr'een member. 10' mountsa light
“
source'l3, and has its graduated face perpendic‘u'é
"The invention possesses other objects andfeaé
tures'of‘advantage,‘ some of which, with'the fore 20 lar‘to the "light beam from. the light source and
going, will be set forth‘ or be apparent in the
. provided with scales I4 and I5 at di?erenticali-é
following description’ of "a typical ‘embodiment
'of the invention; and in the accompanying draw
brated zones 'ofjsaid face'., ,The scale‘ I4 is pro--'
ings;
t Figure
in ‘which,
1_is a fragmentaryihplaniview
' '7
I '
"
illustrat
c
ing .themethod ‘of using thepresent apparatus
forgauging' the toe-in and camber ofra'pair or
dirigible-wheels ‘of 'a motor- vehicle.
}
I
vided adjacent and. about‘ the unitary "beam
source I3 ‘for itsjusejini toe-in and c'ainber
25 measurements, and the scale, I5 is .positioned'for
wardlyrof the "scale‘jlA for its'husein'icastor'an'd
turningera'dius" determinations. V rI_'he scale [14
V
"Figure-2 is afragmentary plan view showing
the apparatus in use for ‘gauging the‘ caster’ and 30
turning
-"_ Figureradius
'3 is arelations
front elevation
of the Wheels."
of‘ the ;assembly
, p
‘ andljhavexja ‘COmmOnij horizontal zero line‘ I8
intersecting the 'be'amiline; 7, The ‘scales l4’ and
35
15 may bejcalibrated?for angle'degreesrwith ‘re
spect to‘ the various Yzerolines thereof, or the
lines of the calibrations may be arbitrarily ,nur'n
40
forna?vehicle having its wheel alignment under
investigation with the presentapparatus areic'om-i
pared-with the valuesvintendedfor the Wheels by
of the Figures land '2; the wheels being set, in
straight-ahead position“ with ‘respect to" ‘the
vehicle.
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' Figure 4 its-an enlargedplan sectionpfjt'he
left-side wheel and ‘associated gaugingfappa;
ratus shown-inFigure 1; the section‘being taken
generally art-the central diamvetrical‘ plane ofthe
. bered for1reference._ Inv ‘eithe'rl caserit‘ will be
understood that the actual determinations made
Figure "5 is a ‘front sectional elevation of the
the
~ 'The
vehicle'manufacturer;
beam r'sources'ls comprise
' " any
" suitable
I. uni;
I
combination of Figure‘! taken generally- vat?a
tary devices for providing the 'beamshand ‘may;
?xed beam line providedby the apparatus; _, _ v
Figure _6jis‘a full-face elevation‘ of'afga'uging
screen comprising-part of the apparatus.’ 7 .'
for _ instancej include electri'ci ‘lamps enclosed in
_ 45
51Figure 7 is an outsideelevtttion ‘of a bracket
for mounting re?ectors of-the'apparatus on a
has van;interrnfediate; vertical ‘zero line '16. inter-l
seoting the‘beam 1ine,'thef scale‘ l5has an inter
mediate'vertical?zero line IL, and the‘scalesllll
suitable housings from whichthe‘beamsiareipro
jected as: pencils or light?'of uniform ‘or slightly
contracting cross-section, as by‘) the i actioniof
lenses and/or'r¢,._e¢t<1i"s' intheihousings; the. use
‘ Figure 8 “is a sectional ‘viewtakenat;-the'line
8—8*in-Figure '7.
V,
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5
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Eel-Figure 9 is a 'fragmentary'plan' view atjthe
‘scale-‘of ‘Figure-4, and {shows theifunc'tioning of
the gauging apparatus for a predetermined right-e‘
turniwheel position‘.
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1. fEsséniial'lyéiihe wtipal gauging apparatus "0i
or an electric ‘lamp ‘as av sourcefof light "for a
50 present beam is assumed .in ‘the present. appay-?
ratus; " The‘ detailsj'of thej'bearnisourcesjl3 are.
not shown; as theyi'are' aside ‘from the scope of
the presentjfeaturesjof‘invention;
1
j If;
* Bracketassemblies" I_9_"a're provided for mount
ingrjthe‘ sets of re?ectors on theidi?erent wheels‘
2,410,339
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[I and I2 in predetermined relation thereto, each
left-turn setting for the left wheel l2, while Fig
re?ector set comprising a rear re?ector 2| and an
intermediate re?ector 2‘2 and a front re?ector 23.
wheel.
ure 9 shows an angle t right-turn setting for said
in mutually ?xed unitary relation to the sup
porting bracket. Each mounted re?ector 22 has
its re?ecting face ?xed in parallel relation to the
plane of the wheel which mounts it whereby,
when the wheel is in straight-ahead position,
For caster determinations with the present ap
paratus, one wheel is set in either a left-turn or
right-turn position with the light beam re?ected
from a re?ector 2| or 23 striking the opposed
screen ill to provide a reading at a point of the
the horizontally‘ projected light beam from the
vertical'zero-line I‘! of its scale 15,; The latter
opposed light source'l3 will be re?ected from the 10 scale reading provides a caster determination
re?ector upon the screen 18 at a point in the
vertical zero line I6 of the scale I4. It Will thllsj
when referred to the horizontal zero line l8 of
. the scale in comparison with the camber reading
be understood that a straight-ahead setting of
from the re?ector 22 with respect to the same
the wheel is readily and accurately‘ effected‘
zero" line, provided the line of intersection of the
re?ecting faces of the re?ectors used is in a. verti
merely by so disposing the wheel that the bean}
re?ected from the re?ector 22 strikes a'point of
cal plane including the point of support of the
wheel carrying the re?ectors. The two readings
thus obtained with respect to the zero line 18 are,
for instance, those obtained from the re?ectors 22
the
Because
verticalofzero
camber,
line N3
theofpoint
the scale
at which
[-4.7 " a light
'
beam re?ected from a re?ector 22 strikes the 6p;
poses; screen I‘! .shqlllcl be below the horizontal
Zeroj line’ I? f the ‘scales Hi and L5 by'an't amount
20
sad’ 2% when the left Wheel, '2, is respectivelr d38
pqsleq inv the diligent nesitiq'rié. Shown fqrilit in
Which‘ repre ts: the angle or. camber for. the
wheel-mounting the re?ector," said: angle being
the slope of the wheelnmounting Spindle when
wheel is in a 's'traightéahead position, as is
assumed ‘for the wheel lZin Figures 1 and 3. For
Figures 1 and 2, it being understood that ‘caster
determinations are made individually for ihedif
fe'r'ent wheels’.
25
measuring camber, it is merely‘inecessary'to so
s'étfa‘ Wheel‘ which is ti? be gauged for 'cameer
thatrthle beam re?ected ‘from the re?ector 22
merited Q?'it strikes a point inihe ‘Vertical
zero ‘line l?’of the scale 14, with the location of
said; point with ‘respect to the horizontal'z'ero
me 18 of ‘the scale I 4 comprising a direct camber
determination; a. nieaWRmeet 9f. the camber
angle for the‘wheel l2 is'indicated in Figure 3.
30
35
these circumstances’, the. left-turn angle "for the
Wheel ll 'slijould bé-le'ss than the angle ‘through
which the wheel 12 has been turned from straight;
ahead, it being recalled that the proper alignment
I relations of thedirigible wheels of a land‘vehicle
requirethat the axes" of rotation of both wheels
intersect the same vertical line in a vertical plane
through the axial line of the non-dirigible wheels
when the dirigible wheels are set for a ‘turning
(lithe. vehicle from a straight-ahead‘. line.
50
hub structure: 26. In the present wheel structure,
the rim 24 is ?xedly'moun'ted on a cylindrical pie?
235m provided both‘ for measuring simultaneous
differences in the angles of turning of the‘wlie‘els
from straight-ahead positions thereof “and ‘for
measuring changes in the angularity of the'turried
wheels with'respect to the verticallthe?neas'ureé
ripheral portion of a disc. 21 which is bolted to
the outer. endv of the hub structure. 'Ifh'e rim 24 is
provided‘ with usual‘ circumferential ,. right-angle
inside corners or‘gro‘oxjes' 28 at its opposite sides,
ments being respectively made withiererieme‘ to ‘ '
60
the vertical zero line H‘ of the scale asking to the
hprizontal‘zero line IQ of the scales l4 and 15.
associated re?ector.
in linesv which are mutu:
ally, parallel tandlare disposed a vertical plane
?icludins the bearing point of the Wheel during a.
reading ‘on a vscale [5i Figure 2 shows an angle i
said corners each being de?ned by ?at radial rim
portions 29 and cylindrical rim portions 3l> at
the outer. edges of the portions 249, and the means
for mounting the sets, of- re?ectors on the'wheels
utilizes said corners at‘the outer wheel faces.
65
for lthenwheels,’ said anglei t‘ being twentyl?ve
degrees in the present instance. “lj‘or reasons
which are‘hereinga'fter brought} out, the planes of
the re?ecting faces of ‘the"re?ectors_' ‘21 and 2‘?!
new iherlane of: the meeting he of. the
The support brackets l9’ are arranged for re
movable mounting directly onv a usual wheel rim
2‘; which mountsa pneumatic tire 25 on a wheel
to béj'tgken at the scale’ M opposite the wheer l l .__' '
' ‘It will now be, noted that ‘thej're?e'ctors‘ 21' and
represent a axes and predetermined turn angle t
and‘ I; are both disposed in left turn positions,
striking of the beam reflected from the. forward
re?ector 23 on ‘the opposed 'éCale. l5 at a point
in the vertical zero line I? of said scale; under
ally comprises the.‘ sum ‘of the. toeéi'n angles ‘for
the. wheelsiand'rnay‘be ‘considered as twice the
With particular reference~ to‘ the scales Hi, ‘the
vertical zieror'lines 11 thereof are arbitrarily'and
correspondingly. positioned on!’ the screen"!!! to
v ' 1'
and with the Wheel .12 assumed to. be set for the
tie; the ss?ettingfof one 'whée'l .in true straight
herilzontally’angular re?ection of'the beam from
the reflector 2;? Qt the other wheel to strike'the
to'eTin angle for either wheel for. gauging purposes;
A measurement of toe-in is indicated in Figured;
with'the
e112, in straight-ahead ‘position and
the total tQeZin reading for both wheels arranged
'
is ascertained as a turning-radius determination.
ahead ‘position should, because- of‘ toe-in, cause .a
scale’, ‘it being understood that'the’ turnan'gle of
the second wheel thus measured horizontally actul
‘
A15. Particularly shows in. Figure 2,, the wheels '1'
Recalling-that the'twfo. diri‘gible’ wheels of a
motor vehicle for hig. way travel are connected
forsiniult 'neeus' swinging in steering the‘ vehi
opposed screen Ill at a point of its scale 14 which
is: ‘forward of‘th'e vertical zero line [6 of the
'
Fer wrhinwadius determinations, one wheel. is,
Set in impression are a dastsr determination,
and thev point at which. the light beam reflected
from the'r'e?ector 2! or 23 ofthe second wheel
strikes the opposed scale I15 supplies a turning
radius determination‘ when referred to the vertical
zero, line H, of the scale.‘ lnthis manner, the dif:
ference in the angles of turning of the two wheels
Each present bracket lilbomprises a base plate
member ‘unwise with Suitable, arms arranged
to ‘have their extremitiescooperatively-engage the
rim corner 28 at the outer wheel side for mount-.
ing. the plate on the rim. ‘As shown, the plate 32
is ‘generally rectangular, and has‘ oneepiece arms
33; fixed at adjacent corners thereof and having
their- extremiiies arranged for ?llies- engagement
in the rim corner 28- at qneorsiie Sides of; the
plate '32‘ from the arms 33, the plate 32; slidably
- motels aims“ hence their: freewheeling also
is
arranged for engagement in a rim corner 28, said
fagerdss‘o
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ar'msbeing shown as mounted in guide sockets 35
,
of‘. the bubble, will position. the. re?ectors rasire
'quired for a proper‘ reading; a‘rotary resetting, of
:the re?ectors by. usegof :the levelling means will
ifriom‘whichtheiruextension is constantly u'rgedb'y
.the'a'ction of springs'36. engaged betweenithe op
»posed inner ends of the socketsv and of theslidable
usually be r'nec'es'sa'ry, rafter ' each :jchange, ‘in-tithe
turn‘ ‘angle’ of‘ the wheelbecause of‘, the ,actiongof
the 'camberand caster onthe'r'angularity Qf-the
arms; ‘_The innerends of set-screws?! mounted *
1115a side of each socket 35 engage slotsu38‘pro
lvidedfin the opposed sides ‘ofthe arms34, said
slots/terminating. short of therinnerarm ends
Iwhereby theinn'er ‘slot ends may‘coact witnthe
iwheel‘withirespect to the Vertical; :,
3 :j
‘ Noting that the effective axis oflswingingrofithe
Twheél" isl‘approxirnately'a vertical :axis through
the bearing-i pointof the tire v25; the. reflectors 12 l
'setéscrews 73?, tolimit the extension of the arms
‘and 22 and 23 are-preferablyrarrangedisatcequal
:from the socketsunder the in?uence of the springs
-36;" The arrangementis such that :a plate 32 may
The ?rmly ‘andaccurately mounted on a wheel rim
‘524m exact parallel relation tothe ‘plane of the rim
distances : from" said axis for. an; average-sized
wheelrime whereby their effective distances from
the‘ opposed screen 10. maybe substantially‘ the
iandl‘wheel by engagingwthe appropriately formed "15 vsame .as the wheel is turnedybecause' of the pit
(extremities of the arms 33 andiiili in‘the corner
center-{swinging ofithe "reflectors as the wheelr-ls
:28'in. simultaneous. engagement with the-‘corner
sides 29 and 31.‘. The arrangement alsovpriovides
~arci1ate 1ine._ _Also, when the disclosed "brackets
turned,“ the re?ectors ‘ are actually‘ spaced in Jan
for the mounting of'aplate 32’ on rims of‘di?erent
19 are mounted on "rimsof;di?eren-tisizepthey
sizesinvtheusual rangewofisize for, such rims, it
:bein'g'noted that the rim-engaging portions of
the various arms 33>and 84 are offset from the
thereby ‘dispose a re?ector assembly at different
heights from the plane ‘of support ‘of‘thegwh'eels.
Since'the beam line: is at'aa?xed level, :the' re
?ectors must be‘ of sufl‘icientiheight’when in po
~planebf the plate 325110 dispo'sethe mounted plate
v'c'lear of the wheel. portion atithe side of .a wheel
-whichis to
mountit.‘
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sition for'use to provide for theirdescribed strike
:25 ing' by and reflections .of. the beams for avusual
l lI‘he re?ectors 2! and 22 and 23 of a set are
range of rim'and tire ‘sizes as affecting the. heights
‘mounted on a block 38 which is ?xed by means of
of disposalof- the re?ector assemblies. ‘ "1'. 2; 1;?
; While av vehicle may have its wheel alignment
a bolt Illv against the outer side'of the plate 32
“to dispose the re?ector‘22 in parallel relation to
relations gauged with the present apparatus while
the wheel plane, the various present re?ectors be '30 supported independently of its‘ dirigible. wheels,
ing rectangular. -In~the present structure, the
more‘ dependable results are 'obtainabl'eiif the
re?ectors 2| and Y23 are in such angular relation
‘gauging operations are effected .while‘ the vehicle
is supported upon all of itslwheels'with theplane
tothe're?ector 22 that the forward screen scales
15 may be'used for gauging readings with either
of support horizontal.’ Accordingly, I prieferito
vleft-turn or right-turn wheel settings. While the 35 support the dirigiblewheels on individualeturn
screens 10 might extend rearwardly of the beam
table assemblies. ‘ ‘Because the bearing‘ point of
-a turning dirigible wheel shifts slightlywith re
sources I3 to provide the-scales i5,1or provide
scales l5 both forwardly and rearwardly for the
_spect to the ?xed vehicle body,_frictionale?e'cts
themirrors 2| and 23, the disclosed position of
the ‘scales’ I5 for use in measuring turn positions
and‘ caster e?ects is generallythe most practical
on-the'tire vat its‘b‘earing point areipreferably
eliminated by permitting'a lateral shifting of the
tire-engaging turntable member with the point.
As brought out inFlgure 5, eachlturntable, as
as best providing for the simultaneous visibility
‘of both scales of both screens to an operator po
sembly comprises a disc '44 having :a ‘ slightly
cupped upper face rotatably jmountedin a cir
iprojection thereupon'of beams're?ected from
> P ‘It will now be noted that the gauging use of the
icular depression 45 of ‘somewhat‘greaterdiame-ter
Q'than-the disc‘provided in the top 4670f a hollow
turn-measuring re?ectors 2| and 23 requires a
base member 41 set'into a'support'?oor F to dis
particular positioning ofthese re?ectors because
of the fact that straight-ahead andturn readings
obtained from different reflectors are to becom
.the'upper floor face,
vsitioned infront of the vehicle.
a
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45
pose the ‘upper disc face in flushfrelation with
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Thepre‘sent base top 46 isiprovided witha ‘cir
jpared as a gauging-‘means. If the-wheels H ‘and
il2~had neither camber'norl caster, the disposal
of re?ectors 2i and 23 to vertically position the
49 depending integrallyrfromthe disc, the vsize
‘of ‘the opening determininga permitted lateral
parallel intersectionlines of the planes of their
shiftingofthe disc from its centeredposition
re?ection faces with that of the re?ector face of ,
1'the associated re?ector 22 would provide’ readings ‘
solely along the scale zero line [8 of the opposed
cular central opening‘ £8 to freely receive a stem
in the ‘base're'c'ess. ' A ?at anti-friction. bearing
'ring 5| is operatively disposed between'the disc
‘44 and the‘ bottom of the depressionlt5 for sup’
porTting the disc upon‘ the‘base for. its lateral
"shifting, and tension springs- EZ-radiating. from
screen ‘as ‘true angularity measures, with respect
to straight-ahead wheel positions. Actually, be
:cause of camber and caster, said intersectionlines 60 the stem 49 to points of attachmentwi-th'lthe
rofithe. re?ection faces of there?ectors, while "
parallel to the wheel plane, ‘must be out of the
‘vertical in vertical planes including the bearing
-:point of the wheel, said bearing point lying sub
stantially in the axisof the king pin 42 about ..
which the. wheel is swung in turning. Accord-'
'ingly, means‘. are provided for setting there
x?ector's as described and required, said means in
ithenp'resent case comprising a level bubble .43 ’
side walls of the base cavity constantlyand-yiéld
ingly urge a rotative and lateral centeringlofthe
‘ disc in'the depression 45, it being understoodthat
the mutualspacing‘of the discs 44 designedto
simultaneously support the two 'dirigible wheels
of a motor vehicle'is the same 'asthesp'acin'g
of ‘the bearingr points ofv the wheels when the
‘"vehicle
' It willisnow
travelling
be ‘noted
straight?"ahead.~
that wheel rims - 24' of ‘dif
mountedion eachzblock 39 and havingits longi v70 _ferent diameters frequently have different widths
"at the rim grooves 28, such widths increasing gen
tudinal line perpendicular tothe aforesaid inter
erally withithe rim diameters, whereby the spac
:se'ctionslinesof the ?at re?ectorifaces of- the
threere?eotors ofrthe, set whereby'the rotation
ing or an operative reflector of ' a mounted", re
~01’, the carrying wheelptov level thetbubhlejabout
‘ ?eotor 'l'a'ssernbly from. .th‘effopposje'd ‘_Scrée'n'j l 0" will
vary and so " change "thesigi??c‘an ej'r,.yof, he
sthe‘lwheelzaxis, which;c.omprises;thelleveling line
2,410,339
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vnations ofthe‘scales. I 4' and» L5 unless’the; re
?ector» and screen are relatively- adjustable ‘for
providing the same spacing of the re?ectors and
8
2.‘ In apparatus for gauging an alignment rela
tion of a. dirigible vehicle wheel disposed for its
swingingin place about an upright axis and from
a straight-ahead position of the wheel with re
5 spect to. the vehicle, an optical indicating means
comprising a ?xed source of light emitting a light
just the screens [0 as required for maintaining
beam directed horizontally toward the wheel in
a line perpendicular to a horizontal line in the
the latter at the distance d. from the re?ectors
screens. for all rim widths. While means; might
be provided for axially adjusting the mirror-car
ry-ing block 39 on the bracket I9, I prefer to ad
for which the graduations of the scales IA and
wheel plane when the wheel is in straight-ahead
I5‘have been provided, it being recalled that the 1,0 position, a ?at re?ector mounted on the Wheel for
its disposal to intercept said light beam for the
three re?ectors of a set are used while arranged
in a common horizontal are such that correspond
re?ection of the beam when the wheel is in a sub
stantially straight-ahead position thereof and
ing horizontal lines of the re?ectors. are equally
having its. re?ecting face parallel to the plane of
spaced‘from the axis of turning of a. wheel hav
ing ' an average-sized rim. With reference to
the wheel, and a?xed scale disposed to intercept
the, re?ected beam at a point in a vertical line
present wheel rim sizes, it, is. noted that the vari
through the. beam line from the source when the
ation in widths is no more than four inches
whereby the required range. ofrelative adjust—
wheel is. in straight-ahead position, said scale
ment of a re?ector set with respect to the op
having. vertical and horizontal calibrations re,
posed screen for a ?xed spacing of-the re?ectors 20 ferred to said beam line from the source for the
and‘ a screen is no more than twoinches and may
gauging of turn and/0r. camber angles of the
be ignored in the ‘middle range of rim Widths.
wheel.
.
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For providing the aforesaid positioning adjust
3._In apparatus for gauging an alignment re
ment of the screens It, as may be needed or de
lation'of a dirigible Vehicle wheel disposed for its
sired, each of said screens is mounted on a pair 25 swinging in place about an upright axis and with
of blocks 54 which are in turn slidably mounted
respect to a straight-ahead position of the. Wheel
in guideways extending in lines parallel to the
with respect to the vehicle, an optical indicating
beams from the beam sources l3 and provided in
means comprising a ?xed source of light emitting
base members 55 ?xedly embedded in the floor F.
a light beam directed horizontally toward the
The tops of the blocks 54 and of the base members 30 wheel in a line perpendicular to a horizontal line
55 which receive them are ?ush, and registering
in the wheel plane when the wheel is. in straight
upper faces of the, blocks and members are con
ahead position, a ?at re?ector ?xedly mounted
veniently calibrated in terms of rim sizes for fa
on the wheel for its disposal to intercept said light
cilitating the setting of the screens at the desired
beam for the reflection of the beam when the
distance d. from the corresponding re?ectors.
35 wheel is in a substantially straight-ahead position
Understanding that welleknown and appro
thereof and having its reflecting face parallel: to
priate corrections are made withrespect towheels
the plane of the wheel, a- second ?at re?ector-?x.
which are found to be misaligned by the use of
edly; mounted on the wheel for its, disposal upon
the present gauging apparatus, it will be noted
an appreciable turning of the wheel from its
that the necessary correction adjustments or
straight-ahead position to intercept said. light
operations may be performed on the, vehicle
beam for the re?ection thereof and having the
structure without, dismounting; the re?ector as
plane of its re?ecting face angularly related! to
semblies or disturbing the remaining parts of the ' the planev of the re?ecting face of the’ ?rst re?ec
present gauging apparatus which are'free, of the
tor and intersecting the latter plane in a line par
allel to the plane of the wheel andarranged'for
wheels and vehicle. In this manner, the eifects
of correction adjustments or, operations may be
its disposal during the gauging; use of; the re?ec
observed as they are madewhereby. to save time
tors in a vertical plane including the bearing
and avoid over-corrections.
point, of the. Wheel, and a ?xed- scale; disposed to
From the foregoing description, talgenin con
intercept the re?ected beam fromthe different
nection withthe accompanying drawing?r?he, ad- r respective. re?ectors when the Wheel is in straight.
vantages of the construction and use-of thepres
ahead and turn positions thereof, said. scale hav
ent alignment-gauging device will be readily
understood by those skilled in the, art to, which
the-invention appertains. While I have described
ing vertical and horizontal calibrations referred
to said beam line from the lightv source for the
gauging of turn and camber-angles, of the wheel.
the features and use of; an arrangement, which I
4. In apparatus for gauging an alignment, re
lation of a dirigible vehicle Wheel; disposed for its
invention, I desire to have it understood that the
swinging in place about an, upright axis and for
showing is primarily illustrative, and, that such
its rotative turning in place, an optical indicat:
changes may be made, whendesired, as fall'with
ing means comprising a?xed source‘ of light, dir
in the scope of the following claims.
recting
a light beam horizontally toward the
60
now consider to be a preferred embodiment of my
,Iclaim:
1'. In apparatus for gauging an, alignment re
lation of a dirigible wheel disposed for its swing
ing in place about an upright axis, an optical in
dicating means comprising, a ?xed source or» light
wheel in a line perpendicular,‘ to a horizontal line
in the wheel plane when the wheelie in straight
ahead position, a support member removably
?xed on the wheel at, its side towardv the. light
source, a ?at re?ector ?xedly carried by thesup
emitting a light beam directed horizontally in a
port member in position thereon tointercept said
line toward said axis; of swinging for the wheel,_ a
light beam when the wheel is in asubstantially
re?ector mountedon thewheel for its disposal to
straighteahead‘ position thereof. and: having the
intercept said light‘beam for the re?ection there
plane of'its re?ecting facelparallel to the plane of
of and having its re?ecting, face parallel to, the
plane of the wheel, and. a ?xed. scale disposed, to 70 the wheel, a second ?at re?ector ?xedly-mount
ed on the support member in- position thereon; to
intercept the re?ected beam at, a point,v in a ver
intercept said light beam upon an: appreciable
tical zero line of the scale intersecting the beam
angular swinging of the-wheel from its- straighte
line when a horizontalline of said" re?ecting face
ahead position and having the plane of its re
intersected by the beam line is perpendicular to
75 ?ecting faceangularly related to the plane offthe
the beam line.
2,410,339
9
10
re?ecting face of the ?rst re?ector and intersect
ing the latter plane in a line parallel to the plane
vertical plane including the bearing point of the
wheel, and a ?xed scale disposed to intersect the
re?ected beam from the different respective ‘re
having its leveling line perpendicular to the plane
?ectors when the wheel is in ‘straight-ahead and
of the re?ecting face of the ?rst re?ector for use 5 turn positions thereof.
in rotatively adjusting the wheel to dispose said
line of intersection of the re?ector planes in a
JOHN L. CREAGMILE.
of the wheel, a leveling means on said support
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