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Dec. 3,‘ 1946. _
g, GHQLMES
’ 2,'411;s79
HEADLIGHT TESTER
Filed June 18, 1940-
‘ 9~ Sheets-Sheet 1 ..
INVINTOR
HERBERT G. HOLMES
ATTORNEY
D8" 3, ‘1946..
0H. G. HOLMES
2,411,879
‘ HEADLIGHT TESTER
Filed June 18,’ 1940
9 Sheets-Sheet 2
/80
Q"
» 178
‘Q
~
24/
INVENTOR
HERAER TGHOLMES
‘as
'
B
ATTORNEY
‘ '
Dec. 3;=_._,1946.'
’
I
H. s. HOLMES
HEADLIGHT TESTER
2,41 1 ,879
v
‘Filed-'June 18. i940v
9 Shuts-Sheet 3v
MN
V
mvzm'oa
HERBERT 6. HOLMES
"ilk. "69%- QKW'
‘
ATT-ORNY
'
Dec. 3, ‘1946.
H, G, HOLMES
2,411,879
HEADLIGHT TESTER
Filed Jun-e 18441940
9 Sheets-Sheet 7
HERBERfGHaLm
av
'
'
ATTORNEY
Dec. 3, 1946.
H. G. HOLMES
2,411,879
vI-IEIADLICYIZIT TESTER
Filed June 18, ‘1940
9 Sheets-Sheet 8
4/
~\'" {
INVENTOR
HERBERT aha/.45.:
ATTORNE
'Dec. 3,1946.‘ '
'
H. e. HOLMES
2,411,879
‘HEADLIGHT TESTER
Filed‘June 18; 1940
9 sheets-sheet 9
Patented Dec. 3, 1946
> 2,411,879
~ UNITED STATES ‘PATIENT * OFFICE
HEADLIGHT "rns'rn‘n
Herbert Glenn Holmes, Lansing, Mich., assignor
to Food Machinery Corporation, San Jose,_
Calif., a corporation of Delaware
' \
Application June 18, 1940, Serial No. 341.178
31 Claims.v (CI. 88-14)
1
.
2
This invention relates to apparatus for test
ing the headlights of automobiles and particularly
to the type of apparatus employing a light-sensi
tive cell in the testing instrument.
.
Fig. '10 is a fragmentary elevationtaken as in
dicated by the arrows Iii-l0 in Fig. 5.
Fig. 11 is a vertical longitudinal section taken '
as indicated by thev arrows I l-i I in Fig. l._
One of the objects of the invention is to pro
vide a headlight testing instrument adapted to be
placed in the beam of a headlight to determine
the angular direction of the beam with respect
Fig. 12 is a fragmentary section taken as indi
cated by the arrows l2-l2 in Fig. 8.
>
.
Fig. 13 is a fragmentary section'taken as in
dicated by the arrows l3-I3 in Fig. 8.
,
to the line of travel of the vehicle. '
Fig. 14 is a. fragmentary section taken as indi
Another object of the invention is to provide a 10 cated by the arrows ill-44 in Fig. 11.
headlight testing instrument adapted to be placed
Fig. 15 is a perspective view of the pendulum
in the beam of the headlight to measure the in
rod which is used as a marker.
.
tensity of the beam and to employ the measure
Fig. 16 illustrates‘ the manner in which the
ment of intensity obtained for determining the‘
marker is positioned in front of the headlight. .
angular direction of the beam with respect to the 15
Fig. 1'7 illustrates the method of measuring
line of'travel of the vehicle.
'
the horizontal inclination by-means of the in-'
Another object of the invention is ,to provide a
strument positioned in front of one headlight
and the marker in front of the other.
Fig. 18 is a vertical section through the optical
headlight testing instrument adapted to be placed
in the beam of the headlight to determine the di
rection of the beam by measuring thevertical 20 ?nder employed to determine the horizontal in
and horizontal inclinations of the beam to the line _ clination of the beam.
of travel of the vehicle.
?
Fig. 19 is a_ horizontal section therethrough
Anotherobject of the invention is to provide
taken as indicated by the arrows i9-l9 in_ Fig.
an improved means for measuring the vertical
18.
-,
inclination of the beam to the line of travel.
Fig. 20 is a plan view with parts broken away
.25
Another object of the invention is to .provide
an apparatus for determining the horizontal in
ciination of the beam.
.
5
~
- of the ?nder in a different position.
Fig. 21 is ahorizontal section through the in
strument, showingthe means for adjusting the
‘
Another object of the‘ invention is_ to provide
finder.‘
'
‘
a means 'for'contacting the lens of the headlight 30 . Fig. 22 is awiring diagram.
which will serve as a universal pivotvon which to
Fig. 23 illustrates the manner of using the head
adjust the instrument axis in a preliminary step
light testing apparatus when the instrument is
of the testing operation.
_
'
mounted .on a mobile stand.
- -
Another object of the invention is to provide a
Fig. 24 is a right side elevation of the instru
headlight testing instrument which can be em 35 ment mounted on the stand. '
.
ployed either as aportable hand instrument or in
Fig. 25 is a plan view thereof.
connection with a mobile stand;
Fig. 26 is a fragmentary plan view of the in
Other objects of the invention will appear after
strument support provided in the stand.
a disclosure of'an apparatus in which the inven-~
In order to facilitate an understanding of the
> tion has been embodied.
invention, a preliminary explanation will be given
’ In the drawings:
'
in which the general arrangement and use of .the
Fig. 1 is a plan view of the testing instrument.
instrument will be brie?y set forth.
Fig. 2 is a right side elevation. The headlight testing instrument comprises
Fig. 3 is a left side elevation.
.
certain. mechanism presently to be described in
Fig. 4 is an elevation of the front end of .the 45 detail, which is contained in a case Ill (Fig. 1).
instrument.
'
The case is provided with a handle ll mounted on
Fig. 5 is a vertical longitudinal section taken
the left side 45 and a handle 42 mounted on the
right side 46 thereof. When used as a portable
as indicated by the arrows 5-5 in Fig; 1.
Fig. 615 a fragmentary sectional view taken as
instrument the operator holds the instrument in
indicated by the arrows [-0 in vFig. 5.
50 his handsby'means of the handles‘ ll, 42. The
instrument is placed in the beam of the headlight
Fig. '7 is a fragmentary sectional view taken as
to be tested by pressing the contact 43. which is
indicated by thearrows ‘|_—'1 in Fig. 5.
v
preferably made of rubber. against the lens of the ‘ '
Fig. 8 is a vertical transverse section taken as
indicatedby the arrows 8-8 in Fig. 1..
_
Fig. 9 is a fragmentary elevation taken as in
dicated by the arrows 9-9 in Fig. 5.
'
headlight.
55
'
-
Rays from the beam of the headlight are ad
mitted to the interior of- the‘ instrument through
2,41 1,879
3
, 4
a plurality of ori?ces numbered 5| to 58 (Fig. 4)
located about the contact 43 in the front wall 44
stantially coincident'with the axis of the beam
and parallel to the rays thereof, parallel rays such
as 99 and I00 (Fig. 5) will enter the apertures 5|,
55 in the front wall 44 of the case, pass through
the apertures 8I and 85 in the front diaphragm ‘I8
.and then pass through the apertures 9I, 95 in
the rear diaphragm 90. It will be apparent that
.this only occurs when the instrument is posi
of the case 40.
-
The intensity of the light admitted to the in
strument from the beam is registered on the me
ter 59 (Fig. 1) which is provided with a pointer
60 that moves over a scale 6I calibrated in candlev
power. A switch 62 mounted on the right side
tioned so that its axis 11 is parallel to the rays 99,
46 of the case 40 governs the range of the meter
l0 100, because if the instrument axis 11 is out of
59, as will presently be described,
parallelism with the rays of the beam, rays such
‘as 99, I00, although they might enter the aper
tures BI, 55, would not pass through the aper
Holding the contact 43 against the lens of the
headlight the operator manipulates the instru
ment with a universal movement, that is, left and
tures 9| and 95. v
‘
right, and up and down, until he ?nds the posi
A series of planar mirrors IM to I08 (Figs. 5,
tion of the instrument at which tehe maximum 15
9, and 10) is mounted on the rear side of the rear
reading is obtained on the intensity meter 59.
diaphragm 90 with the mirror IOI behind aper
The longitudinal axis of the instrument which
ture 9|, mirror I02 behind aperture 92, mirror I03
passes through the center of the contact 43 is
behind aperture 93, and so on. Bowed spring
then substantially in coincidence with the axis
of the beam and in parallelism with the rays 20 clamps I09 are fastened to the diaphragm 90 by
means of screws H0. The ends of each clamp
thereof. In order to determine the direction of
bear against the backs of 'two adjacent mirrors.
the beam, he turns the knob 93 with his left.
In this manner the mirrors are clamped against
thumb to measure the vertical inclination, and
adjusting screws I I2 which are threaded into the
he turns the knob 64 with his right thumb to
measure the horizontal inclination. When the 25 diaphragm 90, there being three adjusting screws
II2 for each mirror.
knob 63 has been properly adjusted, as will pres
The screws H2 are adjusted to position the
ently be described, the operator reads the vertical
mirrors so that they will re?ect the rays into a
inclination by means of the pointer 85 on the
light-sensitive cell I20._ For example, in Fig. 5
scale 58, and when the knob 94 has been properly
adjusted, he reads the horizontal inclination by 30 the mirrors IOI, I05 are adjusted so that they re
flect the rays 99 and I00 in the directions indi
means of the pointer 61, which has two cross
cated by the lines I I3, I I4 which converge at I I5.
hairs 68 that cooperate with two sets of scales,
Av shield I2I having an aperture I22 is placed
one for the right hand lamp, the other for the
over the window of the light-sensitive cell I20,
left hand lamp. These scales are marked on an
arcuate strip 69-which is attached by means of 35 The shield I2I serves to exclude from the light
sensitive cell all rays re?ected thereon except
screws ‘I0 to the top of the case 40. The upper
scales ‘II are calibrated in degrees, and the lower
scales ‘I2 are calibrated in inches at twenty-?ve
feet distance, so that the horizontal inclination
may be measured either in angular degrees or in 40
distance.
,
rays such as 99 and I00 which enter the instru
ment parallel to its axis 11. It will be noted that
the focal point II5 of the re?ected rays lies on
the instrument axis 11, so that rays from the
beam,_such as 99 and I00, are not reflected onto
the light-sensitive cell I20 until the instrument
axis 11 is brought into parallelism with the rays
of the beam.
(Fig. 5) has a press fit in a metal‘cup ‘I3 which
is mounted on the front wall 44 of the case 40 45 The light-sensitive cell I20 is rigidly mounted
Proceeding now with a detailed description of
the instrument mechanism, the rubber contact 43
by means of a spacer bracket ‘II and a screw ‘I5
on the front diaphragm ‘I8 by means of two bosses
which passes through the cup ‘I3 and the bracket
‘I4 and is threaded into the front wall 44 at 15.
I23, I24 (Fig. 21) into which screws I25, I26 are
threaded. The light-sensitive sell I20 (Fig. 5) is
of the blocking-layer type, the metallic elements
It will be recalled that there are a series of aper
tures 5I to 58 (Fig. 4) in the front wall 44. The 50 of which create an electromotive force when ex
posed to light. The electrical response of the cell
top and bottom apertures 5| and 55 appear in Fig.
5. The longitudinal or reference axis of the in
is measured by a sensitive meter 59. Wires I21,
I28 (Figs. 5 and 8) are connected to the terminals
strument or tester is indicated by the center
line 11.
1'?
I29, I30 of the cell I20. The wire I21 leads to
Rigidly mounted within the case 40 and accu 55 the terminal I3I of the meter 59, ‘while the wire
I28 is connected at I32 to a fixed resistance I33.
rately positioned normal to the reference axis 11
A short wire I34 connects the end I32 of the re
is the diaphragm ‘I8. The diaphragm ‘I8 (Fig. 8)
sistance to the terminal I35 of the switch 62.
has a series of apertures 8I to 98 which are lo-‘
cated in longitudinal alignment with the aper
Terminal I31 of the switch is connected by a wire
I38 to the end I39 of the resistance I33. The
tures ii to 58 (Fig. 4), and are‘ smaller than the
terminal I40 of the switch is connected by a wire
apertures 5| to 58. The top and bottom dia
phragm apertures BL. 85 appear in Fig. 5. A
Ill t0 the terminal I42 of the meter 59. As
shown by the wiring diagram in Fig. 22, the
transparent glass plate 99 is mounted on the front
switch 62 serves to ‘connect the resistance I33 in
of the diaphragm ‘I8 and covers the apertures
therein. A second diaphragm 90 is rigidly 65 series with the meter 59 and the cell I20, or to cut
the resistance I33 out of the circuit. The purpose
mounted in the rear end of the case 40 so as to
of this arrangement is to give the meter 59 a high
be accurately positioned normal to the longitudi
and low range depending on whether the resist
nal axis 11. The diaphragm 90 (Fig. 9) has a
ance I33 is cut in or out of the circuit by the
series of apertures [9| to 98 which are the same
size as the apertures inthe front diaphragm ‘l8 0 switch 62.
Thus, when the instrument axis 11 (Fig. 5) is
and are located in longitudinal alignment there
brought into line with the beam, parallel rays
with. The purpose of the aligned apertures in
pass through the apertures in- the two dia
the two diaphragms ‘I8 vand 90 is to select parallel
phragms ‘I8, 90‘ and are re?ected by the mirrors
rays from the beam of the headlight.‘
When the instrument axis TI is posltlolwtl sub
75 through the aperture I22 into the light-sensitive
2,411,879
' 6
cell I25, and the meter 59 (Fig. 1)’ registers the
intensity ofthe light. Conversely, when a maxi
outside the side wall 45. Ascrew I 18 which is
slidable in a slot I85 (Figs. 3 and 12) formed in
the wall 45 is threaded into the knob I15. The
mum reading is obtained on the meter 58, it is
an indication that the instrument axis has been
positioned in line with the beam and the direction
' screw I19 passes through a member I8I which
has pins I82,»I85 engaging in apertures I54, I85
’ of the beam is, in this way, determined.
in the scale plate "I. In order to adjust the
‘scale 55 the operator unscrews the knob I18
from the screw I19 a suiilcient amount to permit
him to move the knob .back and forth, thus caus
ing the scale plate Hi to slide on the sleeves I55, .
I51. When the scale 55 has been positioned as
The mechanism by which the vertical and hor
izontal angles of inclination of the beam to the
line of travel of the vehicle are measured will now '
be described.
v
‘- The vertical inclination is determined by means
ofa’gravity-responsive leveling device which is
adjusted by means of the knob 53 (Fig. 1) dis
. desired, the knob I18 ‘is tightened to hold the ad
justment. ' This scale adjustment is employed by
posed within the handle 4I. The knob 53 is se
the operator to correct the zero position when the
cured by means of a set screw I43 to the outer end 15 automobile is not standing on a true horizontal
of a shaft I44 ,(Fig. 21) which is mounted for ro
.surface at the time the headlights are being
tation in a boss I45 formed on the side wall 45
tested.
of the case. A pinion‘ I45 is secured on the shaft ~'
The operator makes the corrective adjustment
I44 for rotation by the knob 58. .A rack I41 (Fig.
by placing the instrument on a part ‘of the car
11) meshes with the pinion I45, Guide plate I45 ~20 which is known to be level, such as the running
is rigidly attached to the rack I41 and has a slot
board or the floor of the trunk compartment,
I49 therein' through which the shaft I 44 passes
- and levelling the spirit level I55 (Fig. 1) by turn
so that the rack‘ I41 is guided for sliding move
ing the knob 53. When the-bubble I59 is be
ment with respect to the shaft I44 and is main
tween the centering lines I85, I81; which are
tained in mesh with the pinion 145. The forward 25 marked on the glass tube of the level, the pointer
end of the rack I41 is pivotally connected at I55
55 is opposite the mark 55' at the center of the
to the pointer 55. The foot of the pointer 55 is
bubble if the surface on which the automobile is
pivotally supported at I5I on the bar I52 which
standing is horizontal. However, if the surface
is provided with two slots I 58, I54 to receive
is inclined to the horizontal, thepointer 55 will
screws I55, I55 which are threaded into bosses 30 not be opposite the mark 55' at the center of the
I51, I58 (Fig. 21) formed on the side wall 45 of
bubble when the bubble is centered between the
the case. ,By loosening the screws I55, I55 the
lines I85, I81. The operator is able to correct for
bar I52 may be moved forwardly or rearwardly ,
this condition by loosening the knob I18 and
to position the-pivotal center I5I of the pointer
shifting the scale 55 until the zero point is oppo
55. This adjustment is usually made at the fac 35 site the pointer 55. He then locks the scale in
tory for a purpose presently to be described. A
this corrected position by screwing in the knob
lever I59 (Figs. 8 and '11) is connected at I55 to
I 18. '
the pointer 55. The ‘ lever I59 is rotatably
mounted by means of a pin I5I,,(Figs. 1i and 13)
> After this preliminary adjustment the operator
places the instrument in front of one of .the head
= secured thereto and having bearing in an aper
40
ture I52 in a member I53 which is rigidly mount
ed on the side wall 45 by means of screws I 54, I55
lens: Maintaining sufficient pressure on the rub
her contact 43 to prevent the contact from slip
ping on the lens, he manipulates the instrument,
“employing the ?exible contact 49 as a universal
which extend through spacing sleeves I55, I51.
It will be‘understood that the member I53 is ?xed
but the pin 'I5I is free to rotate in the aperture
' I52, thus providing a fulcrum for the lever I59.
- pivot, until he finds the position Of the instru
ment at which a maximum reading is obtained
on the meter scale 6|. When the meter indicates
The upper end of the lever I59 (Figs. 11 and 14)
has a spirit level ‘I58 rigidly secured thereto.
By means of the linkage construction Just de
scribed, the rack I41 (Fig. 11) oscillates the
pointer 55 and rocks the spirit level I55 on ‘its
that the instrument'axis has thus been brought
into line with the beam, the operator holds the
instrument stationary and turns the knob 55' with
fulcrum I5I. The'construction of the linkage is
such that while the movement of the pointer is
proportional to the movement of the spirit level,
the movement of the pointer is greatly multiplied
his thumb, .so as to return the bubble I59 to its
’- central position between the centering lines ‘I85,
I81. After this has been done the position of
the pointer 55 on the scale 55 is read, and this
to facilitate obtaining a reading on the scale 55.
Also, the movements are in opposite directions;
that is, whenthe rack I41 moves the pointer 55‘
reading‘is an indication of the vertical inclina
tion of the beam to the line of travel of the
automobile.
to the left in Fig. 11, the level I55 is rocked to ‘
the right. This further ‘facilitates making the
adiustment in that ‘the pointer moves in the same
direction as the bubble I59 of the level I58,
The scale 55 (Fig. 11) is arcuate in shape and is
secured at its outer edge‘ I18 (Fig. 14) to a verti
cal plate "I having slots I12, I18 (Fig. 13)
through which the spacing sleeves I55, I51 ex
tend. Springs I14,‘ I15 coiled about the sleeves ‘
lights, holding it by the handles 4|, 42,- and
presses the contact 49 against the center of the.
'
As previously mentioned, the adjustment of
the pointer 55 (Fig. 1) is facilitated by the fact
that the pointer moves in the same direction as
the bubble I59 so that, for example, when the
instrument has been positioned to obtain the
maximum reading on themeter 59, if the bubble
(55 I 58 is rearward .of the centering line . I81, the
operator turns the knob 53 to move the pointer
55 forwardly, and in so doing moves the bubble
forwardly. As can be seen in Fig. 11, when the
pointer; 55 is rocked forwardly, that is, to‘the
right in this view, the lever I58 is turned counter
clockwise on its pivot I5 I, thus causing the bubble
I58 to move tov the right or forwardly in the
same direction as the pointer 55. Due to this link
I55, I51 bear against washers I 15, I11 to apply
friction to the plate "I to hold the plate "I
in its adjusted position on- the sleeves I55, I51.
It will be, understood that the plate I" is sup-'
ported by means of these sleeves but is slidably
adjustable thereon by reason of the slots I 12, I18.
In order to impart this sliding adjustment to the ' ageconstruction, there is only one position of the
scale plate "I (Fig. 12) a knob I 15 is provided
levers 55 and I59 in which the pointer is opposite
2,411,879
.
.
7
- the bubble I88. This is the true horizontal posi
tion, that is, when the axis of the instrument is
horizontal. The pointer is adjusted to this posi
tion at the factory by loosening the screws I55, I58
and sliding the bar I52 forwardly or rearwardly
when the instrument is placed on a surface which
is known to 'be horizontal.
now be described. The method consists in estab
.
along the rod 200 to bring the contact 208
against the lens I85. The member 201 is verti
cally adjusted on its supporting bar 205 to- bring
the contact 208 to the center of the lens. The
tube 202 is then adjusted on the rod 200 until
the pendulum I85 is at a vertical position, as
_
The method and apparatus for measuring the
horizontal inclination of the headlight beam will
8
the headlight is mounted. The tube 202 (Fig.
16), together with the bearings I88, 204,'is slid
indicated by the top end 221 of the rod being
10 opposite the pointer 222. By this means the
lishing a plane represented by the dot-dash line
rod I85 is positioned vertically in front of the
opposite headlight and at a predetermined ?xed
I88 (Fig. 17 ) normal to the lines of travel of the
distance in front of the lens thereof. It will
vehicle, such as the lines represented at I88 and
be
noted that the horizontal distance K from
I82, and then measuring the angle I80 which the
contact 208 (Fig. 16) to the rod I85 re
beam direction I8I makes with the established 15 the
mains constant on account of the fact that
transverse plane I88. The line of travel I82 nor
the members I88 and 205 are rigidly joined to
mal to the plane I88 and passing through the
gether by means. of the tube 202, which is
contact 43 forms with the instrument axis 11,
welded to the bearings I88 and 204, so, that the
which coincides with the beam direction I8I, an
I88 to 205‘is a unit. The vertical axis
angle I83 which is the complement of the angle 20 assembly
223 (Fig. 5) of an optical finder 224 in the in
I80. The angle I83 is the horizontal inclination
strument is located this same distance K from
of thebeam to the line of travel of the vehicle.
the contact 43, so that" the imaginary reference
In other words, to determine the horizontal in
plane is established by sighting the marker I85
' clination of the beam to the line of travel, the
the ?nder 224 because they are dis
following steps aretaken: the imaginary plane 25 through
posed at equal distances in front of the twov
' normal to the line of travel is established. The
horizontal angle which the beammakes with the
. imaginary plane is determined. Finally, the com
plement of the angle between the beam and the
plane is measured, because this complementary
angle equals the horizontal angle between the
beam and the line of travel.
.
headlights.
-
The ?nder 224 comprises a laterally extend
ing tube 225 (Fig. 18) having a lens 220 in the
outer end thereof. The tube 225 is formed inte
grally with the mounting 226" which has a verti
cally extending cylindrical portion 22'1rotatable
in a bore 228 in a boss 230 .formed in the top of
The apparatus for establishing the imaginary
the case 40. A collar 23.I is secured to the cylin
reference plane I88 is constructed as follows.
portion 221 by means of a set screw 232.
As shown in Fig. 1'7, when testing one head 35 drical
The hub 233 of the pointer 51 (Fig. 1) is inter~
light with the instrument, a marker device in
posed between the bottom of the collar 23I and
dicated generally at I84 is placed in front of
the top of the boss 230. The pointer 51 (Fig.
the other headlight. The device I84 (Fig. 16)
.5) ' has a spring detent 234 ‘attached thereto
includes'a pendulum rod I85 which is suspended
engages in the notch 235 (Figs. 5 and 19)
in a vertical position at.a predetermined ?xed 40 which
formed in the underside of the collar 23I. This
distance K in front of the lens I85 of the head
connection between the hub of the pointer and
light. Preferably, the rod I85 is chromium
the collar of the finder is made detachable for
plated so that it will be illuminated by the beam
a purpose presently to be described. As long
from the headlight. Referring to Fig. 15, where
as the detent 234 is seated in the notch 235 the
the marker device I84 is shown in perspective on V
pointer 51 and the collar 23I rotate in unison
an enlarged scale, the pendulum rod I85 is piv
about the axis 223 of the ?nder. An adjustable
otally mounted at I81 in a support I88 having
eye piece 235 having a ground glass screen 231
a bearing portion I88 bored to receive a rod
mounted
in the lower end .thereof is slidably
200., The portion I88 is rigidly secured at 20I
within the cylindrical portion 221.
to a tube 202 which is rigidly secured at 203 50 mounted
And a mirror 238 is clamped by means of screws
to a bearing 204 formed integrally with a bar
205 having guide lugs 205 for a member 201
which can be adjusted vertically by sliding on,
the bar 205. The member has two guide lugs
208 which embrace .the bar 205. The foot of
the member 201 extends forwardly toward the
headlight and is provided with a contact 208
which is brought into engagement with ‘the
lens I85 as shown in Fig. 16_.
The rod 200
which isv slidable in thebearings I88, 204, ‘has
238 to the mounting 225'. There is a window
240 in the sidewall 45 of the case. By moving
the eyepiece up and down the operator can
5 focus the image of the pendulum rod I85 which
_ is vre?ected from the mirror 238 on the ground
glass 231;
In order to test both headlights, the ?nder 224
is adjustable to right and left hand positions,
60 which are 180° apart. The position shown in
Figs. 18 and 19 is the position of the parts when
the left hand headlight is being tested, in which
an eye 2I0 formed at its forward end. The
eye portion .2I0 fits‘ into a circular groove 2“
case the tube 225 points to the right and the im
formed in theperiphery of a disc 2I2 \so that
age of the rod is received through the right hand
the disc 2I2 is freely rotatable within the eye
member 2I0 about a horizontal axis. The disc 65 window 240. When the right hand headlight is
being tested, as shown in Fig. 1'1, the tube 225v
2I2 has a bore. 2I3 coincident with its axis of
is swung around to point out of the left hand
rotation, and the bent rod 2“ having down!
window “I, as shown in Fig. 20. This is made
. wardly inclined ends 2I5, 2I5 is supported for
possible by the following construction. ‘The col
rotation in the bore 2I3. Rubber suction cups
2", 2I8 are pivotally mounted at 2I8, 220 on the 70 led‘ 23I (Fig. 19) has a semi-circular depression , _,
242 formed therein‘ into which extends a pin 243
ends of the bent rod 2'I4.
,
‘
having
a press fit in an aperture 244 (Fig. '18)
These suction cups are pressed into engage
in the boss 230. The pin 243 serves as a stop
ment with the headlight as shown in Fig. 16_
pin. The semi-circular depression 242 permits
or into engagement with the fender as shown
' in Fig. 23, depending on the manner in which 75 the collar 23I to be rotated’through 180° clock
9.411370
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Y
10
I
through the eye piece 255. He turns the knob
54 to bring the image of the pendulum into co
- 'wis'e'in Fig.1!) but prevents counterclockwise ro
, tation for more'than a limited amount. Diamet
incidence with the cross hair 254 on the ground
rically oppositethe notch 255 in the collar 25I
glass 251. When this has been done he notes
is a similar notch 245 in ‘which the detent 254
the reading on the scale 55 for the right hand
is adapted to seat after the collar 23I has been
lamp. After the right hand headlight has been
rotated 180°. The detent and the pointer 51 are
adjusted, he places the marker I54 on the right
limited in their movement by reason‘of the fact
. hand lamp, and turns the collar‘25l (Fig. 20) 180°.
that thé hub 255 of the pointer 51 has an open
The detent 254 disengages from the notch 245
ing 245 through which the pin 245 extends, and
the limits of'movement of the pointer 51‘ are de 10' and engages in the notch‘ 255 (Fig. 19). The
termined by contact of either of=the two edges Y tube 225, which was directed at the left hand
241 with the pin. 245. To change the finder from Y window 2“, is: thus swung around through_180'
the right-hand position (Fig. 19) to the left hand \ to be directed at the right hand window 245. The
position-‘(Fig 20)‘ the operator turns the collar , operator now places the, instrument in front of
25I ‘clockwise. When the wall 241 of the opening 15 the left hand headlight, engaging the contact 45 '
, with the lens and manipulating the instrument
245 in the hub 255 contacts the pin 245, the point
as before to obtain the maximum intensity read
er 51 is stopped and the detent 234 is disengaged
ing. He then turns the knob 54 (Fig. 1) to center
from the notch 255. The operator ‘continues to
the pendulum image on'the cross hair v254 and
turn the collar 25I for 180° until the notch 245
reads the scale for the left hand lamp.
receives the‘detent 254, thus again coupling the
in Fig. ‘21 the ?nder 224--and pointer 51 are‘
pointer to the finder for use in the left hand po
shown in phantom. Assuming that the instru
sition (Fig. 20) . The pointer has two cross hairs
ment has been placed in front of the right hand
55 for cooperation with the‘right and left han
headlight and has been. manipulated until par
scales (Fig. 1) as previously described.
'
The means for adjusting the pointer 51 by 25 allel rays 255 and 255 from the beam pass through
apertures" and 51 in front diaphragm 15 and
means of the knob 54 will now be described. The
through apertures 55 and 51 in rear diaphragm 55
knob 54 (Fig. 21) is secured by means of a set
and are re?ected by mirrors I55, I51 in the direc
screw 241 to a shaft 245‘ rotatably' supported in
a boss 245 formed on the side wall 45. The shaft
tions 251, 255 onto, the light-sensitive cell I25,
245 has a pinion 255 (Fig. ‘6) secured-thereto 30 when the maximum meter reading is obtained it
will indicate that the instrument axis 11 is in line
with the beam. Now, if the knob 54 is adjusted
to point the tube 225 of the ?nder 224 directly at
the pendulum hanging on the other headlight, '
by the rack 25I is maintained in engagement
- with the pinion 255. The forward end of the rack 35 the angle I55 formed by the‘center line 255 of
the pointer 51 with the axis 11 is the horizontal‘
25I is pivotally connected at‘ 254 to a lever 255 ‘
angle which the beam makes with the line of
which isv pivotally mounted on the sidewall 45
travel of the vehicle, and this horizontal inclina
by means of a pin 255. The upper end of-the
tion is measured by the position of the pointer 51
lever 255 has a pin 251 rigidly mounted therein,
‘ (Fig. 1) on the scale 55.
‘
and extending inwardly for engagement in a Jaw
which meshes with a rack 25I' (Fig. 5). A plate
252 is secured to the rack 25I and has a slot
255 formed therein to receive the shaft 245 where
Instead of employing the headlight tester as a ~
255 formed in the end of a bell crank 255 (Fig.
portable instrument, it can be used with a mobile
stand, if so desired. The methodof using the
at 255 from the top of the case 45. The other
vinstrument and its construction and mode'of
' arm of the bell crank 255 has a pin 25I rigidly
secured thereto which projects upwardly through : operation, however, remain unchanged. ,As
shown in'Figs. 25 to 25, the stand is provided with
a slot 252 (Figs. 5 ‘and '1) formed in the top of
_a base 215 supported on three wheels 2'“, 212,
the case 45 into a slot 255 formed in-the pointer
215. A vertical tubular support 214 is rigidly
~ 51.
When the knob 54 (Fig. 21) isrotated by
mounted on the base 215. A‘ second tube 215., is
the operator. it turns the pinion 255 and through
' the rack 25! (Fig. 5) oscillates the lever 255 which 50 ‘telescopically mounted on the tube 214 and is
adapted to be vertically ‘adjusted thereon and
in turn oscillates the-bell crank 255 which by
held in, adjusted position by means of a clamp
means of the pin 25I moves the pointer 51 over
215. The instrument support 211 has a bearing
the scale 55, and since the pointer 51 is connected
to the ?nder 224 by means ‘of the detent 254 en-. Y portion in vertically slidable' on the, tube in.
gaged in the notch 255 or the notch245'rotation. 55 The weight of the instrument and its support
211 is carried on a pulley 215 rotatably mounted
' of the knob 54 also results in rotation of the
in the top of the tube 215 by means of a cable
21). The‘ bell crank 255 is pivotally supported
?nder 224.
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5
The operation is as follows: To test the right
hand headlight the marker-device I54 (Fig. 1'!)
is attached to the‘ left hand headlight and ad
hated to bring the contact 255 (Fig. 16) against
the center of the lens I55 and to position the
' pendulum I55 in the vertical position with its ‘end.
.
255 and counterweight 25I.
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/
The base of the instrument has two apertures
therein to receive dowel pins 252,255. The dowel
Y pins 252, 255 (Fig. 26) are fixedv in a leverv 254
which is mounted for swinging movement on a Y
pivot coincident with the front dowel 255 on a'
member 255. The rear end of the lever 254 ex
22l Opposite the pointer 22!. The headlight-test 65 tends
through an arcuate slot 255 formed in'
ing instrument ‘is then placed in front of the
the member 255. The member 255 has a hori
Y right hand headlight, as shown in Fig. 1'1, with
zontalpivot 251. (Figs. 24 and 26) in the front
its 00115805 45-Main'st the. lens, and-the instru
‘end of-the support 211. A pm 255 is ?xed in
ment is manipulated, as previously described, to
the bottom of the member 255 and extends down
obtain the maximum reading on the intensity 70 wardly as shown in Fig. 24, to engage the front
end ‘of a lever 255 pivoted in the support 211 at ‘
meter,in order to bring the instrument axis into
linewiththebeam. .-,
.“
Y
_.
255. An adjusting screw 251 adjustably mount
Holdingythe instrument in this position, the
ed on the support 211 bearapgainst the ‘rear'
operator rotates the Isnob 54 . (Fig. ,1) viewing the
end of the lever 255. ,By turning the vscrew 25I
image of the’ pendulum on the other headlight 75 the instrument can be adjusted about the hori
12
responsive vto the vlight‘ intensity’ of‘said' rays for
indicating when the axis oftjthe- instrument is
‘ means is employed in the same manner as previ
ously described to adjust the instrument in the
beam of the headlight to obtain the maximum
parallel with said headlight beam, said "contact
being mounted onntheli'ght-admitting end of the
reading on the meter 59, thecontact '43. being
instrument in‘ffront of said diaphragm means
and located on the axis of the instrument, where
by' the instrument can be manipulated universal
lyon said contact as a pivot.
engaged with the lens 292 (Fig. 23) of the head
The vertical inclination is indicated on
thescale 66 after adjusting the knob 63 and the ‘ }
horizontal inclination is read on the scale 89“ 7 '
after adjusting the knob 64, the marker 194 be
‘
4. A - headlight , testing ‘instrument [adapted to
I be placed in thebeam' of the‘ headlight compris
ing attached to the other headlight in the man'- .
_
I
rays of light from the headlight beam,‘ and ‘means
This mechanical supporting land‘vadjusting
ner previously explained.
'
apertures for admitting a pluralityv ofqparallel
‘ cal pivot 283.
light.
'
diaphragm, means disposed normal ,to the axis of
.said instrumentan'd provided with afplurality of
'zontal pivot 281 and by swingingthe lever 284
the instrument can‘be adjusted about the verti
l5 ing, a case, a single contactmounted on the front
“ of said case and adapted to be brought ‘into en-.
gagement with the lens of the headlight, means
While I have described a. particular embodi
. ment of the present invention, it will be obvious
for selecting parallel rays from the beam, said
means comprising spaced-apart diaphrag'ms
from the spirit of the present invention and the 20 mounted within said case normal to the longi
that various changes and modi?cations may be -_
made in the details thereof without departing
scope of the appended claims.
'
tudinal axis‘ of the instrument and provided with
,
' longitudinallyeaiigned apertures, a light-sensitive
‘ cell having a lighteadmitting aperture disposed
Having thus described my invention and in
what manner the same may be used, ‘what I
claim as new and desire to protect by Letters
Patent'is:
,
l
‘
..
.
.
.
on ‘said axis, means to direct said selected par
25 allel rays through said cell aperture, and a meter
to register the response of said cell to the light
1. A headlight testing instrument adapted to
be placed in the beam of a headlight, comprising
a front diaphragmgdisposed normal to the axis
of the instrument and having a plurality of aper
tures arranged around said axis, a 'rear dia-,
directed thereonL-said longitudinal axis of said
from the, beam entering an aperture in said
. receiving opening in one’ end of said housing
adapted to receive a light beam from said head
light, means in said housing and visible from the
instrument passing through the‘ center of said
lens contact, whereby the instrument can be ma
universally on said contact as a pivot
vso nipulated
to position the instrument axis parallel to the
phragm spaced‘ apart from said frontdiaphragm
rays of the beam as indicated by a maximum light
and disposed normal to said axis, said rear dia
phragm having aperturescorre'sponding to said} _, intensity reading on said meter.
'5. A device for testing the headlight of an
apertures in said front diaphragm: and arranged
in longitudinal alignment therewith ‘so that rays 85 automobile comprising a, portable housing, a light, I
front diaphragm'parallelto saidv axis will pass
through the corresponding aperture in said sec¢ '
ond diaphragm, a light-sensitive cell disposed on
_ said axis intermediate said diaphragms, a plu 40
rality of planar mirrors mounted on said second
diaphragm behind the apertures therein and ar-_
exterior thereof for receiving the light beam en-'
tering said opening and indicating when the axis
of said beam coincides with the axis of the hous
' irig, a second opening ‘in a side wall of said hous
ranged to receive the rays-passing~ through said ‘
ing adapted to receive a second light beam from
apertures and to re?ect the rays which pass
an external source, and means in said housing
through said apertures in said second diaphragm
onto said cell, and a meter to register the re
sponse of said cell to the light reflected thereon.
2. A headlight testing instrument adapted to
be placed in the beam of a headlight, comprising
a front diaphragm disposed normal to the axis
of the instrument and having a plurality of
apertures arranged around said axis, a rear dia-'
phragm spaced apart from said front diaphragm
and visible from the exterior thereof for receiving
said second beam and indicating, when the axis of
said second beam has a‘ predeterminedangular
relationship to the axis of said housing.
6. A headlight tester adapted to be placed in
the light'beam of a headlight comprising means
for indicating when the‘ axis of the light beam of
the headlight is parallel to a predetermined ref
erence axis of the tester, an optical system asso
ciated with the tester, means for positioning the
phragm having apertures corresponding to said 55 optical system at a predetermined distance ahead
of the headlight, and means associated with the
‘apertures in said front diaphragm and arranged
optical system for indicating the angular relation
in longitudinal alignment therewith so that rays
and disposed normal to said axis, said rear dia
ship of the reference axis with respect to a ray
from the beam entering an aperture in said
of light received by said optical system from a
front diaphragm parallel to said axis will pass.
through the corresponding aperture in said sec 60 source laterally disposed of said tester and po
'sitioned a de?nite distance ahead of said head
ond diaphragm, a light-sensitive cell mounted on
said front diaphragm and having a light shield
I‘ '7.’ An automobile headlight testing instrument
disposed normal to said axis, said shield having
adapted to be placed in front or a headlight beam
an aperture to admit light to said cell, the center‘
light.
.
I
‘
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of said aperture being on said axis, a planar 05 comprising a contact for contacting vthe hes-Lie
light to dispose the instrument a predetermined
distance from the same, means for aligning the
hind each aperture therein and angular-1y in
longitudinal axis of theinstrument with the di
clined to receive the ray which passes through
rection of the beam projected by the headlight
the aperture and to re?ect said ray through said
shield aperture into said cell, and a meter to reg 70 with which the instrument is in contact. an op
mirror mounted on said second diaphragm be- ' "
ister the response of said cell to the light re
?ected through said shield by said mirrors.
tical ?nder mounted on said instrument for an
gular adjustment on a vertical axis intersecting
the longitudinal axis of the instrument at'a point
. '3. A headlight testing instrument. having a
contact adapted to be placed in engagement with . spaced a predetermined distance ‘from said head
the lens of the headlight, said instrument having 76 ‘light, and means for indicating the angular dis
2,411,879
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14
7
position of said ?nder relative to the longitudinal
axis of the instrument when said finder is sight
. them onto said intensity indicating means,‘ said
ed on ‘a marker positioned a distance in front of
the other headlight equal to the distance of the
intersection of said axes from said ?rst men
means from the remaining rays of the headlight
beam.
tioned headlight.
- 8. An automobile headlight testing‘ instrument '
comprising a contact on the longitudinal axis
thereof for engagement with a headlight, means
for indicating when the instrument axis is in
line with the beam of the headlight, an optical
?nder angularly adjustable on a vertical axis
intersecting said instrument axis, means for in
dicating the angular adjustment of said ?nder
with respect to the instrument axis, and means
for aligning said ?nder with a marker positioned
in front of the other headlight a distance equal
to the distance of the intersection of said axes
from said ?rst mentioned headlight.
diaphragms shielding said mirrors and indicating
. 12. An apparatus for determining the direc
. tion of a headlight beam comprising a pair of
diaphragms for positioning in front of a head
light, said diaphragms being arranged one be
hind the other and provided with aligned aper
tures whereby to separate parallel shafts of light
from said beam and permit passage of said shafts
therethrough, light intensity indicating means
intermediate said diaphragms, planar mirrors
arranged to receive said parallel shafts of light,
and adjustable means for individually positioning
said planar mirrors relative to the apertures of
the diaphragms and the light intensity indicat
~ ing means to re?ect the shafts of light admitted
by the apertures of the diaphragms onto said
9. An automobile headlight testing apparatus 20 light intensity indicating means.
adapted to be placed in front of one headlight,
comprising a housing,- a light sensitive cell on
13. A device for testing the lateral adjust
ment of an automobile headlight, which includes
a housing having an opening adapted to be man
the longitudinal axis of said housing, spaced apart
diaphragms associated with the housing and dis
. ually positioned in opposition to the lens of a
posed normal to the longitudinal axis thereof, 25 headlight, said housing being provided with ex
said diaphragms having longitudinally aligned
ternally-observable means for indicating when it
apertures for separating parallel rays from the ' is also positioned in a de?nite relation to the
beam of the headlight, light collecting and di
"hot spot" of the beam projected through said
recting means arranged to receive said parallel
opening by said headlight, an externally-ob
rays and to direct and focus the same onto said 30 servable screen in said housing, a second opening
‘cell, a meter for registering the electrical response
in said housing,wan optical system in said hous
of said cell, an optical ?nder mounted within
ing aligned with said second opening and so po
said housing for angular adjustment about a ver- > sitioned that when said housing is positioned in
tical axis intersecting the longitudinal axis of
said relation to said headlight lens and said
the housing at right angles, the side wall of said 85 “hot spot,” a, beam of light-originating at 1a
housing having an aperture aligned with said ?nd- '
point to one side of and at a de?nite distance
er, and an indicator for indicating the angular
ahead of said headlight lens will pass through
adjustment of said ?nder with respect to the
said optical system and impinge upon an indi
longitudinal axis of the housing whereby said
cated part of said screen when the headlight
' housing can. be positioned with the longitudinal 40 beam is projected in the desired direction lat
Y axis thereof in line with the headlight beam as
erally with respect to the longitudinal axis of’
indicated by the maximum reading on said meter
the automobile.'
and said ?nder can be adjusted to sight a marker
14. A device for testing the lateral adjustment
placed in front of the other headlight to vobtain ' of an automobile headlight, which includes a
a measurement of the lateral aim of said beam.
housing having an opening adapted to be manu
10. An automobile headlight testing instru
ally positioned in opposition to the lens of a
ment comprising, a case having a contact for
headlight, said housing being provided with ex-'
engaging the lens of one headlight, handles on
ternally-observable means for indicating when
said case for enabling an, operator to manipulate
itis also positioned in a de?nite relation to the
the case on said contact‘ as a pivot to align the 50 “hot spot” of the beam projected through said
axis of the case with the beam of said headlight,
opening by said headlight, an externally-observ
an optical ?nder vin said case adjustable for
able screen in said housing, a second opening
sighting a marker disposed in front of the other '
in said- housing, an‘ optical system in said hous
headlight, means to adjust-said ?nder ‘including
ing aligned with said second opening and so po
an adjusting-member adjacent one of said han: 55 sitioned that, when said housing is positioned in
dles, a scale on said case disposed at one side of
said relation to said headlight and said “hot
the axis of the case, and an indicator adjustable
spot,” a beam of light originating at a point
with said ?nder andcooperating with said scale
to one side of and at a de?nite distance ahead
for ‘registering the horizontal inclination of the
of said headlight lens will pass through said
- beam of said ?rst mentioned headlight relative 60 optical system and impinge upon an indicated
to the inclination of the beam of the other head
part of said screen when the headlight beam is
light, said indicator being so connected to said
?nder that the indicator is at zero on said scale
when the sight line‘ of said ?nder is at right
angles to the case axis.
=
-
projected in the desired direction laterally with
respect to the longitudinal axis of the automo
bile, both said means and said screen being so
65 positioned as to be observable from the same
11. An apparatus for determining the directionv
position of observation.
of a headlight beam comprising a pair of dia
15. A device for testing the adjustment of an
phragms for positioning in front of a headlight,
automobile headlight, which includes a housing
said diaphragms being arranged one behind the
having an opening adapted to be manually po-1
other and provided with aligned apertures where 70 sitioned in opposition to the lens of a headlight,
by to separate parallel shafts of light from said
externally-observable means for indicating when
beam and permit passage of said-shafts there
the housing is also posltionedin a de?nite rela
through, light intensity indicating means, and
tion to the “hot spot” of the headlight beam
planar mirrors arranged to receive said parallel
projected through said opening, an externally- .
shafts of light and to re?ect and superimpose 76 observable target, a second opening in said hous
2,411,879
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in front of the other headlight of the automobile,
ing, an optical system in said housing, the opti
‘an indicator releasably connected to said ?nder
for registering the angular position of said opti
cal ?nder with respect to the longitudinal axis of
saidsupport, and means operatively intercon
cal axis of which passes through said second
opening and is also so directed as to direct a beam
of light from a source positioned to one side of
and at a predetermined distance in front of the
headlight lens onto an indicated part of said tar
necting said indicator and said optical ?nder in
two positions of said ?nder, one for sighting to
the left, the other to the right, said interconnect
ing means being operable to disconnect the indi
16. A device for testing the headlight of an 10 cator from the- ?nder when the ?nder is moved
from one position to the other.
I
automobile comprising a portable housing, a light
20. An apparatus for determining the lateral
receiving opening in one end of said housing
adjustment of an automobile headlight compris
adapted to receive a light beam from said head
ing a support adapted to be placed in front of
light, means adapted to be manually positioned
against the lens of said headlight to .position 15 one headlight with the longitudinal axis of the
support aligned with the headlight beam, an
said opening in opposition to said lens, means in
optical ?nder mounted on the support for rota
said housing and visible from the exterior there
tion on a vertical axis through an angle of ap
of for receiving the light beam entering said
proximately 180° to dispose said ?nder in dia
opening and indicating when the axis of said
beam coincides with the axis of the housing, a 20 metrically opposite positions on the support, a
pointer releasably connected to said ?nder and
second opening in a side wall of said housing
get when the headlight beam is projected in the
desired direction laterally with respect to the
longitudinal axis of the automobile.
movable over a scale mounted on the support to
adapted to receive a second light beam from an
external source, and means in said housing and
visible from the exterior thereof for receiving said
second beam and indicating when the axis of
said second beam has a predetermined angular
- relationship to the axis of said housing.
17. A device for testing the headlight of an
automobile comprising a portable housing, a light
receiving opening in one end of said housing
adapted to receive a light beam from said head
light, means in said housing and visible from
indicate the angular position of said ?nder with
respect to'the longitudinal axis of said support,
25 means for connecting said pointer and said ?nder
for movement together when said ?nder is dis
posed in either one of said diametrically op
-posite positions, and means for moving said
pointer to adjust said ?nder for sighting the
?nder on a marker placedrin front of the other
headlight of the automobile, said connecting
means being operable to disconnect the pointer
,from the ?nder when the ?nder is moved from
the exterior thereof for receiving thelight beam
one position to the other.
I
entering said opening and indicating when the
21.
An
apparatus
for
testing
the
vertical
and
35
axis of said beam coincides with the axis of the
lateral adjustment of an automobile headlight
housing, said means comprising an electrical
comprising a support adapted to be positioned
light responsive element,. a second opening in a
‘in front of one headlight of the automobile with
side wall of said housing adapted to receive a
the longitudinal axis of the support aligned with
second light beam from an external source, and
means including a screen in said housing and 40 the headlight beam, spaced diaphragms on said
visible from the exterior thereof for ‘receiving - support having longitudinally aligned apertures
for admitting rays from the beam parallel to
said second beam and indicating when the axis
the axis of the support,'means on said support
of said second beam has a predetermined angular '
responsive to the rays of the headlight beam
relationship to the axis‘of said housing.
,
passing through the aligned apertures of said
18. A device for testing the headlight of an
diaphragms for indicating the amount of light
automobile comprising a portable housing, ‘a
passing through said apertures, means including
light receiving opening in one end of said hous
a leveling device on said support for indicating
ing adapted to receive a light beam from said
the vertical inclination of the longitudinal axis '
headlight, means adapted to be manually posi
tioned against the lens of said headlight to po 60 of said support, means for measuring the lat
eral deviation of the longitudinal axis of said
sition said opening in oppositionto saidlens,
support with respect to the line of travel of the
means in said housing and visible from the ex
automobile when the longitudinal axis of the
terior thereof for receiving the light beam en
support is aligned with the headlight beam in
tering said opening and indicating when the axis
cluding an optical ?nder on the support, means
' (if said beam coincides with the axis of the hous
for adjusting said ?nder for sighting a marker
ing, said means comprising an electrical light
positioned in front of the other headlight of the
responsive element, a second opening in a side
automobile, and means for indicating the angular
wall of said housing adapted to receive a- second
position of said ?nder with respect to the direc
‘light beam from an external source, and means
in said housing and visible from the exterior 60 tion of the axis of the support when said, ?nder
.is sighted against said marker.
thereof for receiving said second beam and in22. An apparatus for testing the vertical and
dicating when the axis of said second beam has
horizontal adjustment-of an automobile head
a predetermined angular relationship to the axis
light comprising a housing having a contact
of said housing, said. means including a re?ector
for receiving light from said second opening and 65 thereon aligned with the longitudinal axis of the
housing, two handles on said housing. for en
adapted to re?ect said light on an externally ob
servable screen.
'
.
'
abling ‘an operator to hold the housing with‘ said
contact in engagement with the lens of the
headlight and to manipulate the'housing with
70 said contact as a pivot to position the longitudi
nal axis of the housing in parallelism with the
' port adapted to be positioned in front of one
headlight beam, means associated with said
headlight with the longitudinal axis of the sup
housing for indicating when the longitudinal
port aligned with the headlight beam, an optical
axis thereof is parallel with the headlight beam,
?nder mounted on said support, said optical
?nder being adjustable for sighting on a marker 76 means including a leveling'device within said
19. An automobile headlight testing apparatus
for determining the direction in which a head
light is projecting its beam, comprising a .sup
2,411,879
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housing for measuring the vertical inclination
of the longitudinal axis of said housing when
the longitudinal axis of ‘the housing is parallel
with the headlight beam, means for measuring
.
ing when the ?nder is sighted against said
marker.
.
25. A headlight testing instrument adapted to
be placed in the beam of the headlight and hav
the horizontal deviation of the longitudinal axis
of said housing with respect to the line of travel
of the automobile when the longitudinal axis of
ing a case containing testing mechanism re
sponsive to changes in the light intensity as de
the housing is aligned with the headlight beam
relative to the headlight beamv for indicating
termined by changes in the positionof said case
including an optical ?nder within said housing,
when the axis of said beam coincides with the
means for adjusting said ?nder from the ex 10. axis of the instrument, the case being provided
with a plurality of apertures to admit parallel
terior of said housing for sighting a marker po
shafts of light from the beam to the interior of
sitloned in front of the other headlight of the
said case, means within ‘the case for intercept
automobile, and means for indicating the angu
ing parallel shafts of light admitted through the
lar position of said ?nder with respect to the
longitudinal axis of said housing when said ?nder 15 apertures for actuating the testing mechanism,
is sighted against said marker.
'
23. An apparatus for determining the direction
‘in which a headlight of an automobile is pro
and a contact composed of slip resisting material
mounted in ?xed position on said case centrally
with respect to the apertures and coincident with
,_ the longitudinal axis of the instrument, >_ said
jecting its beam comprising a support adapted
to be placed in front of the ‘headlight with the 20 contact being adapted to engage the headlight
longitudinal axis of the support aligned with the . at a single point and to permit the instrument
headlight beam, an optical ?nder mounted on
the support for rotation‘ on a vertical axis inter
to be manipulated universally on said contact
as a pivot while said contact is maintained in
engagement with the lens to position the instru
secting the longitudinal axis of said support
through an angle of approximately 180° to'dis 25 ment axis parallel to the shafts of light admitted
through the apertures.
I ,
pose said ?nder in diametrically opposite posi
26. An automobile headlight testing apparatus
tions on the support, a pointer releasably con
comprising, a housing adapted to be placed in
nected to said ?nder and movable over a scale ‘
front of one headlight with the longitudinal axis
mounted on the support at one side of the longi
tudinal axis of the support to indicate the angu 30 of said housing aligned therewith, said housing
being provided with a window on each side, an‘
lar position of said ?nder with respect to the
optical ?nder selectively rotatable into align
longitudinal axis of said support, means for con
ment with either of said windows for sighting a
necting said pointer and said ?nder for move
marker placed in front of the other headlight
.ment together when said ?nder is disposed in
either one of ‘said diametrically opposite posi 35 through the selected window, a pointer connect
ed to said finder, means for releasing said con
tions, and means for moving said pointer vto ad
nection to permit said selective rotation of the
just said ?nder for sighting the ?nder on a
finder relative to the pointer, means for opera
marker disposed in front of the other headlight
tively connecting said pointer to said ?nder when
of the automobile.
.
24. An apparatus for testing the vertical and 40 said ?nder is positioned for sighting through
either of said windows, and two scales at one
the horizontal adjustment of an automobile
‘end of said housing, one of said scales being
headlight comprising, a housing having a con
disposed at one side of the longitudinal axis of
tact thereon aligned with the longitudinal axis
said housing and cooperating with an index line
of the housing, two handles on said housing for
on said pointer for measuring the horizontal aim
enabling an operator to hold the housing with
of the left headlight of an automobile, and the
said contact in engagement ‘with the lens of the
other scale being disposed at the other side of
headlight and to manipulate the housing with
the longitudinal axis of said housing and cooper
said contact as a pivot to position the longitudi
ating with .a second index line on said pointer
nal axis of the housing in parallelism with the
headlight beam, means associated with said 50 for measuring the horizontal aim of the right
headlight of an automobile, the connection be
housing for indicating when the longitudinal axis
tween said ?nder and said pointer being such
thereof is parallel with the headlight beam,
that each of said index lines is at zero. on its
means including an adjustable leveling device
scale when the sight line of the ?nder is normal
‘within said housing for measuring the vertical
inclination of the longitudinal axis of said hous 55 to said housing axis. _
27. A headlight testing instrument adapted to
ing when the longitudinal axis of the housing
be placed in the' beam of a headlight and hav
is parallel with the headlight beam, means ex
ing a case containing testing mechanism capable
terior of said housing and adjacent one of said
of indicating changes in intensity of light im
handles for adjusting said leveling device to hori
zontal position,'a window formed in each side 60 pressed thereon as determined by changes in
the position of saidcase relative to the head'
of said housing, means for measuring the hori
light beam to indicate when the axis of said beam
. , zontal deviation of the longitudinal axis of said
coincides with the axis of the case, said case be
housing with respect to the line of travel of the
ing provided with a plurality of apertures for
automobile when the longitudinal axis of the
housing is aligned with the headlight beam, in 65 admitting shafts of light from the beam to the
cluding an optical ?nder within said housing
adapted to be placed for sighting through either
interior of said case, means within the case for
‘intercepting the shafts 'of light admitted through
the apertures and impressing the shafts of light
of said windows, means adjacent the other of said
on the testing mechanism, a contact mounted
handles for adjusting said ?nder from the ex 70 on the front of said case coincident with the
terior of said housing for sighting through either
longitudinal axis of the case and adapted to en
of said windows a marker positioned in front of
gage the lens of the headlight and to be main
the other headlight of the automobile, and means
tained in engagement therewith while the case
for indicatingthe angular position of said ?nder
is manipulated universally with said contact as
with respect to the longitudinal axis of said hous 75 a pivot to position the case axis ‘parallel to the
9,411,879
19
20
I
maximum light intensity indicated by said test- _
ciated with the tester and the sighting device for
measuring the angular disposition oi’ the refer
ing mechanism.
28. A headlight tester adapted to be placed in
inary plane.
_axis of ‘the headlight beam as indicated by a
ence axis of the tester with respect to said imag
30. A headlight tester adapted to be placed
the light beam of one headlight of an automo
in the light beam or one headlight of an auto
bile, comprising means for indicating when the
mobile, comprising means for indicating when
axis of the light beam of the headlight is parallel
the axis of the light beam of the headlight is
to a predetermined reference axis of the tester,
aligned with a predetermined reference axis of
an adjustable lateral sighting device associated
with said tester, means for positioning‘said de 10 the tester, a sighting device associated with said
tester and angularly adjustable on a vertical axis
vice a predetermined distance ahead of the.
intersecting said tester axis at a predetermined
headlight, and means associated with said sight
distance from the front of the tester, means for
ing device for indicating when. the device is
indicating when said sighting device is aligned
aligned with a marker positioned a predeter
with a vtarget positioned in front of_ the other
mined, distance in front of the other headlight
headlight of, the automobile a. distance substan
of the automobile, whereby an imaginary plane
tially equal to the distance 0! the intersection of
is established between said indicating means and
said vertical axis and said tester axis from the
said marker to which plane the direction of the
?rst mentioned headlight, and means for indi
_beam of the headlight to be tested can be re
ierred to for measurement oi’ its aim.
20 cating the angular relationship of said sighting
device with respect to vthe—predetermined refer
29. A headlight tester adapted to be placed
ence axis of the tester.
in the light beam of one headlight of an auto
31. A headlight tester adapted to be placed in
mobile, comprising means for indicating when
the axis of the light beam of the headlight is > the light beam of a headlight, comprising means
parallel to a predetermined reference axis oi 25 for indicating when the axis of the light beam of
the headlight has a predetermined relationship
the tester, an adjustable lateral sighting device
to a predetermined reference axis of the tester,
associated with said tester, means for positioning
an optical system associated with the tester,
said device a predetermined distance ahead of
means for positioning the optical system at a
the headlight, means associated with said sight
ing device for indicating when the device is 30 predetermined distance ahead of the headlight,
and means associated with the optical system for
aligned with a marker positioned a predeter
indicating the angular relationship of the refer
mined distance in ‘front or the other headlight
ence axis with respect to a ray of light received
oi the automobile, whereby an imaginary plane
by said optical system from a source laterally
is established between said indicating means and
said marker to which plane the, direction of the 35 disposed of said tester and positioned a de?nite
distance ahead of said headlight.
beam of the headlight to be tested can be referred
HERBERT GLENN HOLMES.
to for measurement of its aim, and means asso
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