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Патент USA US2006654

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July 2, 1935.
c. M. ROAN
2,006,654
DIRECTION TURN INDICATOR FOR VEHICLES
Filed May ‘19, 1932
5 Sheets-Sheet 1
mmwlor
July 2, 1935.
2,006,654
c. M. ROAN
DIRECTION TURN INDICATOR FOR VEHICLES
Filed May 19, 1952
>5 Sheets-Sheet 5
July 2, 1935.
c. M. ROAN
‘2,006,654
DIRECTION TURN INDICATOR FOR VEHICLES
'F‘iled May 19, 1932
5 Sheets-Sheet 4
I C‘orl M. 30612
July 2, 1935.
c. M. ROAN
2,006,654
DIRECTION TURN INDICATOR FOR VEHICLES
Filed May 19, 1952
.99
\.
5 Sheets-Sheet 5
Carl‘ A7. R0612
59 zliyarpqya
2,006,654
Patented July 2, 1935
UNITED STATES ‘PATENT orrlcs
DIRECTION TURN INDICATOR FOR
VEHICLES
Carl M. Roan, Minneapolis, li’linm, assignor to
Beacon Safety Signal 00., Minneapolis, Minn.,
a corporation of Minnesota
Application May 19, 1932, Serial No. 612,236
10 Claims. (Cl. 116-54)
My present invention relates to direction turn
indicators for vehicles, such as automotive
buses, automobiles and the like andhas among
its important objects the provision of an ex
5.
tremely
simple,
relatively inexpensive,
and
highly efficient device of the class described.
One object of the invention is the provision of
a signalling device that is normally enclosed in
a Weather-tight casing and which is’ readily
movable out of the casing and into a signalling
position. Another object of the invention is
the provision of an ef?cient mechanism ‘for oper
ating the signal. The above and other impor
tant objects and advantages of the invention
will be made apparent from the following speci
?cation and claims.
Generally stated, the invention consists of the
Fig. 13 is a transverse vertical section taken
on the line iii-53 of Fig. 12;
Fig. 14 is a detail sectional view taken ap
proximately on the line hi—~i1i of Fig. 13;
Fig. 15 is a perspective view illustrating an
indicator mounted in a receptacle that is
adapted to be partially recessed in a body;
novel devices, combinations of devices and ar
5
Fig. 16 is a transverse vertical section taken
on the line I'd-45 of Fig. 15;
.
Fig. 17 is a fragmentary view similar to Fig.
56 but taken on the line |_l'-i'i of Fig. 15;
Fig. 18 is a diagrammatic view illustrating the
electrical hook-up of the various electrical ele-,
ments of the invention; and
1.0. ;
Fig. 19 is a detail sectional view taken on the 15
line iii-19 of Fig. 15.
Or" the parts of the bus illustrated, it is only
necessary to note the body indicated as an en
rangement ‘of parts hereinafter described and tirety by it, the windows thereof indicated by 20
2!], the roof or top thereof indicated by 2| and
de?ned in the claims.
In the accompanying drawings, which illus which is provided with a luggage~carrying rack
trate the invention, like characters indicate like 22, and a compressed air tanl: or reservoir indi
cated at 23. It should here be understood that
parts throughout the several views.
most buses of the present day employ . com
Referring to the drawings:
Fig. 1 is a view in side elevation of an auto~ pressed air brakes and are, therefore, customari
motive bus incorporating one of my improved ly provided with an air reservoir such as the tank
direction turn indicating devices and its oper 23 and suitable means for maintaining a desired
'
.
ating and control mechanism, the signal arm air pressure in the tank.
The casing of the turn indicator is indicated
thereoi being in a normal or inoperative posi~
as an entirety by 24. This casing is open at its
Fig. 2 is an enlarged perspective view of a exposed side except at its extreme upper portion
complete indicator with its signal arm in an where it is closed by a down-turned lipv 25‘. The
tion;
exposed open side of the casing is provided with
Fig. 3 is a view in longitudinal horizontal a shutter 26 that is pivotally suspended from the
35
section taken on the line 3-3 of Fig. 2, and on lip 25 by suitable hinges 21.
The signal arm of the indicator is indicated as
a scale still further enlarged than Fig. 2;
Fig. 4 is a fragmentary detail view taken in an entirety byEEl. This signal arm is normally
operative position;
the vicinity of the line 4—4 of Fig. 2;
contained within the casing 24 and is vertically
Fig. 5 is a transverse section taken on the pivoted thereto at one end for pivotal move
.
40 line 5--5 of Fig. 2;
Fig. 6 is a transverse section taken on the
ments thereinto and thereout of, by means of
opposed headless screws 29 that work one
through the top and one through the bottom of
line 5-45- of Fig. 3;
Fig. 7 is a view in transverse section taken of the casing 24, and which screws are quite
tightly screwed into opposite ends of a double-V ’
on the line 'I-—'I of Fig. 2;
Fig. 8 is a perspective view of the signal arm ended trunnion 39. This trunnion 30 is extend
ed through the axis of the signal arm 28 and is
of the device and certain associated parts;
tightly but removably clamped thereto for moveFig. 9 is a view similar to Fig. 8, but with the
ments therewith by means of opposed clamping
tip and translucent sides thereof removed;
’
~
Fig. 10 is a perspective view of the tip of the nuts 3|.
To remove the signal arm 28 from thecasing,
50' signal arm;
it is only necessary to remove the opposed screws
Fig. 11 is a perspective view of one of the
29 from the trunnion 36 through their respective
translucent sides of the signal arm;
portions of the casing, turn the complete signal
Fig. 12 is a perspective view, with some parts
removed, of the control apparatus of the de
vice;
arm and its trunnion a partial rotation, and
'
withdraw the same through the casing opening. 5.5
g.
2,006,654
The signal arm 28 is composed of a solid heel little power is required to move the shutter.‘
32 and an extended shell that is made up of Carried by and projecting outwardly and up- _
upper. and lower plates 33 and 34, a tip 35 form
ing a detachable extension of the plates 33 and
34, a bracket 36, and the removable translucent
side plates indicated by 31. The upper and lower
plates 33 and 34 are clamped to their respective
wardly from the outer top edge of the signal
arm is a cam lug 5| that engages the shutter
26 after the signal arm is moved out of its hous
ing and before it has reached an operative posi
tion, and acts to lift the shutter away from the
upper and, lower portions of the heel 32 by the cam arm and into a’ substantially horizontal po
opposed clamping nuts 3| and near the junction
10 of the heel-piece 32 and the shell of the signal
arm, said plates 33 and 34 are connected at 38.
sition. During retracting movements of the sig
nal arm, this lug 5| acts to support the shutter 10
and delay closing thereof, until the signal arm '
Beyond the heel-piece 32, the plates 33 and 34 has been moved substantially back into the
are formed at their opposite sides with opposed
channels 39 for receiving the translucent side
housing.
,
,
As a preferred means for operating the sig
15 plates 31. , The signal arm tip 35 is pointed at
nal arm, I employ a'?uid pressure motor 52, 15
its free end to simulate the head of an arrow which includes a cylinder 53 and a piston 54.
and is provided with channels 393 that form ex The cylinder 53 is disposed longitudinally of the
tensions of the channels 39 when said tip is op casing and is formed at one end with an angular
eratively positioned and receive the; outer end
20 portions of the translucent plates 31.- The head 55 that is ?tted into one corner of the cas
ing and conforms to the contour thereof so as
bracket 36 is secured to the free end portions of to prevent accidental rotation of the ‘cylinder 20
the plates 33 and 34 by means of screws 40 and within the casing. The piston is detachably se-'
projects beyond the free ends of said plates. The cured in position in the casing by means of a
tip 35 of the signal arm is detachably secured to clamping bracket 56, and a suitable nut
the projected portion of the bracket 36 by means equipped bolt 51.’ ‘ The piston 54 is provided
of screws 4|. The translucent side plates 31 may with a projecting piston rod 758 that works 25
be of any suitable color but preferably and in through a removable head 59 at the inner end
accordance with accepted practice the one facing of the cylinder. This piston rod 58 is ‘provided
rear, when the signal arm is extended,.will be at its freeend with a’ rack 66 that meshes with
red and the one facing front will be green.
the pinion 41 and works slidably in, a g-uidé‘way
The bracket 36 divides the interior of the sig 6|. The piston 54 is at all times under strain
nal arm into inner and outer compartments 42 of a coil compression spring 62 to be moved to
and, 43, respectively.
These compartments are its retracted inoperative position. This spring
each equipped with a light bulb 44, that is de—' 62 is inserted into the cylinderrthrough its open
35
tachably mounted in a socket 45 of the type ' end when the removable head 59 is removed'and 35
most commonly used in automobile head lamps is compressed between'the piston, 54 and said,
andthe like. The socket 45 of the inner com head when said head is secured in position;
partment 42 is mounted on and projects out
The angular cylinderhead is axially drilled to’
wardly from the heel-piece 32 of the signal arm
40 and the socket 45 of the outer compartment is provide an air admission port 63 to the interior
of the cylinder '53 and is drilled transversely to
mounted onrand projects outwardly from the its axis to receive a valve 64'. The valve 64 in; '40.
bracket 36.
’
tersects the air inlet‘ port 63 and is provided
With the signal arm constructed, as described, with a transverse passage 65‘, which passage
the light bulbs are readily accessible for replace
45 ment and the translucent side plates 31 are will, under rotation of the valve, be brought into , 7
different degrees of registration with the port 45»
' readily’ removed and replaced. It will be obvious 53 and control ?ow through the 'port. The cyl
' that to gain access to the light bulbs, it is only inder 53 is connected to- the pressure tank'or
‘necessary to remove the screws 4|, draw the tip reservoir 23 through the port 63, suitable pipe
35 longitudinally over the plates 31 and there ?ttings 66, and an air line 61, which air line in
50
after withdraw the plates 31 from the grooves cludes a control valve 68, preferably located
or channels 39.
,
within convenient reach of the operator of the
Pivotally mounted on the upper end portion of
the trunnion 30 is a cam arm 46 having a hub
The controlling valve may be of any suitable
46a that is formed with a pinion 41. This cam
55 arm 46 is ‘substantially L-shaped and is turned character but the valve here illustrated’ has
been found highly desirable and while not here
downwardly and outwardly near its free end to claimed will probably be made the subject mat 55.
' provide a shutter camming surface 46'’. Pivotal ter of an independent application. The valve
movements of the cam arm 46 in respect to the 68 illustrated comprises a body 69 having an in- ‘
trunnion
30 and signal arm 28 are limited by let port 10 and an outlet port 1|, said ports're
60
means of a pin 48 that is carried by and depends ceiving adjacent ends of the air line 61., Be 60.
from the arm 46 and works in a segmental slot tween the inlet and outlet ports, the bodyr69 is
49 in an underlying plate 50 that is rigidly car-‘ drilled from its bottom at right angles to the
ried by the signal arm. In its normal or inoper inlet and outlet ports to afford a valve chamber
ative position, the tip or free end of the cam 12 between the inlet and outlet’ports. This
arm 46 rests in very close relation to, the then valve chamber 12 is closed at its bottom by a
closed shutter 26, as shown by dotted lines in screw-threaded plug 13, which is formed with a 65
bus.
.Fig. 6, and will, under initial outwardv pivotal
'
'
'
passage 14 that connects, theinlet port 18 with ,- .
.movements, move free of the signal arm, and the valve chamber ‘12. ‘The passage 14 com
70 impart initial opening movementsto the shutter municates with the valve chamber through the
in advance to moving the signal arm from the axis of the plug and the portions of the plug
70
surrounding the top of the passage '12, afford a
‘ By special reference to Fig. 6, it will be noted seat for a needle valve 15. The needle valve 15
that the tip of the cam arm primarily acts upon works through and has screw-threaded engage
the, lower intermediate portion of the shutter ment with the upper portion of the body 69 and
where its leverage is relatively great and very is provided at its projected upper end with an
75
casing.
_
r
'
'
3
2,006,654
operating arm 16. The valve body 69 is further
provided with an exhaust port ll that leads from
a reduced upper portion lZa of the valve cham
ber 72 to the atmosphere. The needle valve
15 is provided between its lower end and the
upper portion of the main valve chamber '32 with
a radially projecting tapered‘ valve surface it.
portion or" the segmental spring contact 89 but ‘
said signal arm contact‘ engages the interme
diate portion of the segmental conact during
outward pivotal movements of the signal arm
and when the signal arm is approximately mid
way between inoperative and fully operative
positions. Under continued outward pivotal
movements of the signal arm from a midway
The
cooperating
valve suria
seat cformed
3 is adapted
by a shoulder
to seat ‘is be
10 tween the main valve chamber l2 and the re»
duced portion thereof '52s. and when seatedin
said seat positively cuts on‘ communication be—
position and after initial engagement of the
contact
with the contact 88 said contact 89, 10'
being eccentric to the axis of the segmental
contact 83, will by camming action, move the
same toward the free end of the yielding contact
tween the valve chamber and the atmosphere 90 and into engagement with said yielding ?xed
through the exhaust port. In a normal or inop
contact just before the signal arm reaches’ a 15'
erative position the needle valve. 15 is screwed completely extended operative position.
down upon its seat thereby cutting oil co1nmuni~
The signal arm lamp bulbs 44 are connected
cation
ll, respectively,
between the
andinlet
the and
valveoutlet
surface
ports
l3 l6
there» in parallel to the battery B in the following
manner: One side of each bulb 44 is grounded
on will be off i'ts'seat thereby leaving the outlet to the metallic parts of the vehicle at Ma and 20
port ii in communication with the atmosphere
through the exhaust port ‘ll. When the needle
valve is turned off its seat about one-half rota
tion, the inlet and outlet ports "all and ll, re
spectively, will be connected and the valve sur~
face '18 will be seated and cut off communication
between the valve chamber and atmosphere.
The valve body E8 is preferably enclosed in
connected therethrough to the grounded side
of the battery B. The opposite sides of the
bulbs iii} are connected together by a lead 92
and through this lead and a lead 93 .to the
signal arm contact 89. The signal arm contact 25
is, or course, engageable with the switch contact
and when so engaged the circuit of the light
bulbs 43 is completed therethrough. and the
the upper compartment or of a two compartment
common lead Bl, of which the lead‘ 93 may be
control box 38. The stem of the needle valve “.5 considered a branch lead, to ‘the other side of 30
1 works through the top of the box 3% and the
battery B.
"
operating lever "5% thereof is applied thereto theThe
circuit of the pilot lamp bulb 82 is nor
above said box. The lower compartment of the mally open and includes a ground connection
indicator and control box, indicated by b, serves 820. between. one side of the bulb 82 and the
as a pilot lamp chamber and has mounted there grounded side oi the battery B, alead94 con 35
in a light bulb socket lll'that is equipped with necting the other side of said bulb to the yield
the light bulb 82. The box
may be mounted ing ?xed contact99 and through said contact
to a suitably fixed part of the interior oi the
the common lead 81 to the opposite side
bus by suitable screws or bolts applied through of and
the battery B. The lead 94 constitutes an
the mounting lugs
formed on said box. The
40
branch of the common lead 81.
'
exposed side oi‘ the control box is normally other
Intc'rposed, one in the lead 94 of the pilot
closed by a detachably applied cover plate 3% lamp circuit and one in the lead 93 of the signal
having a glass covered light aperture 8:": therein
:1 lamps 64, are conventional‘ flashers that
opposite the pilot light chamber.
alternately open and close their respective cir
The electric lamps 44 of the signal arm and cuits when the same are completed through the
45
the pilot lamp 8?; are energized from a suitable
switch SW and cause the lamps to produce a
source of potential B which may be assumed rapid succession of flashes during their operative
to be the vehicle’s storage battery through cir~
cuits shown clearly in Fig. 18 and immediately
It will now be apparent that the signal arm
to be described. One side of the battery B is lamps M and pilot lamp 82 will be inoperative 50v
grounded at 86 to the metallic parts or" the
when the signal arm is in an inoperative re
vehicle and at its other side said battery is
tracted position within its casing‘ and that the
connected by means of a lead 81 that is com
mon to all circuits to a segmental spring con signal arm lamps 44 will be rendered operative
tact 88 of a three contact illuminating system to produce a series of ?ashes when the signal
55
control switch SW and which contact 88 is arm is moved to or beyond its intermediate po
also common to all circuits. The control switch ition and further that the pilot lamp 82 will
SW further includes a contact {iii carried by " .sh only when the signal arm is in a substan
illy fully extended position; By'?ashing the
but insulated from the heel 32 of the signal
.~
‘.21 arm lamps a very attractive and there
arm at a point radially offset from the axis
fore very effective turn indication is produced. 60
thereof,
and
a
?xed
resilient
contact
‘5t.
One
(50
he pilot lamp 82 indicates to the operator of
end of the segmental spring contact 98 is rigidly
the
vehicle that the signal is in a fully extended
secured to one end portion of and is insulated
from the casing 24 at 9! and said contact is position and due to its ?ashing action is so
disposed with its segmental portion eccentric to effective that it will continually remind the
operator that the signal is in an operative po
the
The axis
yielding
of the
?xed
signal
contact
arm S5and
is secured
its contact
at one sition, thereby minimizing the possibilities of
end to the casing in overlapping relation to the the operator’s forgetting and leaving the signal
secured end of the contact 88 and is insulated in an extended operative position. Failure of
therefrom and the casing at Ma. The free end the pilot lamp to illuminate when the needle,
of the contact at is normally disposed in close valve i5 is turned to its signal arm operating
relation to but spaced slightly from the free position will, of course, indicate to the operator
end of the signal arm spring contact 313. The that the signal arm has not'been moved to a
periods.
.
.
'
y
1
segmental contact 89 is normally, that is, when completely extended operative position.
the signal arm is in a fully retracted or in
There are illustrated in the drawings two
operative position, spaced from the adjacent mounting devices for the indicator casing. 24', 75
4
2,006,654
one thereof being illustrated in Figs. 1, 2, 3, 5, plete indicating unit. will be turned end for end
6, and 7 and‘ the other‘ thereof being shown in and this will render it necessary or desirable to
Figs. 15 to 17, inclusive and 19. The ?rst interchange the translucent side plates 31 to
noted of these devices comprises a mounting keep the red thereof facing the rear end, and '
1 plate 953 that projects completely across the‘ the green thereof facing front whenithe signal
back of the casing 24 and beyond the ends
thereof. This plate 95*1 is detachably secured to
the back of the casing by screws or the like 96
arm is extended.
, '
Although the shutter 26 tends to close under
the action of gravity, it is desirable to incor- .
applied through the back of the casing from porate means for positively holding the shutter
10, the interior'thereof ' and said mounting plate against rattling or accidental opening move
95“ is detachably secured to the vehicle body ments but which means will offer a minimum of
by screws, bolts or the like 91 applied through resistance to outward movements of the cam arm
apertures 99' in the projected ends thereof. 46 and the signal arm. For this purpose I
When this form of mounting is employed, the provide a yielding retracting device including an
15v complete indicator casing 24 extends beyond arm
I01 that is pivoted at I08 tov a casing lug
‘ the plane of the adjacent portion of the vehicle I09. At its free end the lever I01 works slidably I
_
body.
~
7
‘
~
in a guideway IIO formed by a channel member
The second form of mounting device illus
III rigid on the inner surface of the shutter 26.
trated, see Figs. 15 to 17 inclusive and 19, is The lever I01 is under tension of a spring “.2 to
made up of a receptacle 99 having projecting move the lever I01 to a nearly vertical shutter
?anges I00 at its open side. ‘This receptacle 99 closed position. The spring‘ H2 has hooked en 20
a is adapted to receive the casing 24 of the indi
gagement at one end with the lever I01 near its
cator but is somewhat longer than the indicator pivot I08 at H3 and at its other end is anchored
casing to afford a coupling chamber atone end. to the casing, by means of a bracket H4, at a
2.5; The air pressure line 61, it will be noted, extends point slightly below the plane of the lever’s pivot
25
through an opening I02 in the end of the recep
I08.
tacle 99 adjacent the coupling chamber MI and
the couplings 66 thereof'are within and acces
.
‘
'
With the described closing device, the spring
has a maximum shutter closing pressure on
sible through the open side of the chamber IOI.
30. In the particular instance illustrated, the recep lever I01 when said lever and shutter are in their
closed or inoperative positions and gradually
tacle 99 is of less ‘depth than the signal housing approaches its dead center and becomes increas 30'
24 so that said signal housing projects beyond
ingly ineffective as the shutter and lever are.
' the ?anged receptacle.
The ?anged receptacle moved to their extreme upper operativev posi- .
and the lever I01, because it engages the
having an outwardly projecting shield ?ange I04 tions;
outermost
of the channel H0 when the 35
surrounding the projecting portion of the signal shutter is portion
closed and the innermost portion
housing. The top and front edges of this ?ange thereof when the shutter is open, has maximum
project beyond the-signal housing and the rear leverage and-exerts maximum closing pressure
and bottom thereof terminate in the plane of the on the shutter, when it is closed and becomes
signal housing 24. The projecting top and front increasingly ineffective on the shutter, as the
edges of the ?ange I04 protect the indicator shutter approaches a completely open position. 40
housing from rain, snow, sleet and wind created In this manner, spring closing pressureapplied
by forward movement of the vehicle. The re to the shutter is decreased during opening move—
99 is provided with a removable cover plate I03
40
ceptacle 99 is adapted'to berecessed in a vehicle ments of the shutter in approximately the same
_ body ,with its, ?anges I00 overlying the sur
rounding portions of and secured to the body by
means of suitable screws or the like I05.
The
cover plate I03 of the receptacle is detachably
' secured to the ?anges I00 of the receptacle by
screws or the like I06. The indicator housing
24 is secured in the receptacle by means of
screws 96“. applied through the back of the indi
cator housing and screwed into the adjacent
back wall of the receptacle 99 from the interior
of the indicator housing.
7
To remove the indicator housing from the re
a
degree as the action of gravity increase.
Operation
,
From the foregoing it will-be apparent that
when the operator turns the valve 15 to an oper- '
ative position, by means of the handle 16, the 50
piston 54 will be moved by air pressure to the
right in respect to Fig. 3, against the action of
the spring 62 thereby extending the piston rod
58 and rack 60 and turning the pinion 41 in a
counter-clockwise direction. The cam arm 46, 55
ceptacle, the‘ cover plate I03 is ?rst removed. being formed with the pinion 41 and being free
With this done; the coupling chamber IN is for limited movements in respect to the signal
7 open, and the couplings 66 are easily" accessible arm, will move outward in advance to the signal
60 and are removed.‘ The mounting screws 96a are arm and impart initial opening movements to
.now removed, access‘thereto being gained by the shutter before the signal arm is moved and 60
7 opening the shutter 26 and moving the signal will thereafter pick up the signal ‘arm and move
arm to an operative position. When this form the same therewith from the casing. The lug
of mounting is employed,- the indicator housing 5! of the signal arm will, during outward move
65 24 will be very inconspicuous when the signal ments of the signal arm, pick up the shutter and
arm-is retracted'although the turn indication, raise the same free of the cam arm 46.
It will further be apparent that when the op
equally effective as when the ?rst noted form of erator turns the valve 15 to its inoperative posi
tion the piston 54, piston rod 59 and its rack 60
mounting is employed.
As here illustrated, the indicating unit is lo will be retracted by means of the spring 62 and
65
' when the signal arm is extended, will be as
cated on the left-hand side of the vehicle and the pinion 41 and its/integrally formed arm‘46 ' 70.
employed as a left-hand turn indicator but will be turned in a clockwise direction. The cam
obviously it may be located on the right-hand’ arm 46 will move into engagement with the.
7 side of the vehicle and employed as a right-hand signal arm and thereafter move the same there
75 '
turn indicator, in which latter instance the com
with to a retracted position and during most
2,006,654
5
for limited pivotal movements in respect
of such movement of the signal will support the nion
to the signal arm, a pinion carried by said cam,
shutter and delay closing thereof, until the sig and power‘ means operative on said cam and
10
nal arm has moved substantially back into the through said cam on said said signal arm in
casing, this being due to the fact that during cluding a rack meshing with said pinion, said
inward movement of the signal arm, the cam cam being operative to impart initial opening
movement to said- shutter in advance of the
arm 46 is against the signal arm.
Outward movement of the signal is limited movement of said arm.
6. A direction turn indicator comprising a
by means of resilient bumpers H5 and H6 car
10
ried by the indicator housing and one engaging housing having an open exposed side, a shutter
hingedly connected to and normally closing the
the signal arm and the other engaging the sig open side of said housing, a signal arm pivoted
nal arm contact 89 at the limit of the outward to and normally within the housing, a cam hav
movement of the signal arm. The bumper ab ing limited pivotal movement in respect to said‘
sorbs the impact thereby quieting operation of arm, and power means operative on said cam 15
15 the device and taking the strain off of the parts.
What I claim is:
l. A direction turn indicator comprising a
housing having an open exposed side, a shutter
and through said cam on said signal arm, said‘
cam being operative to impart initial movement
to the shutter in advance of‘movement to said
signal arm toward an extended position.
v7. A direction turn indicator comprising a 20
hinged at its upper edge to the open side there
20 of, a signal arm pivoted to and normally within housing having an open exposed side, a shutter
said housing, a cam having a limited pivotal hingedly connected to the open side of Said
movement in respect to said arm, and power housing, a signal arm pivoted to and normally
means operative on said cam and through said
cam on said signal arm, said cam being opera~
25 tive to impart initial opening movement to said
shutter in advance of the movement of said
signal arm.
2. A direction turn indicator comprising a
housing having an open exposed side, a shutter
30 hinged at its upper edge to the open side thereof, a
signal arm pivoted to and normally within said
housing, a cam having a limited pivotal move~
ment in respect to said arm, and power means
operative on said cam and through said cam on
35 said signal arm, said cam being operative to
impart initial opening movement to said shutter
in advance of the movement of said signal arm,
said cam at the limit of its outward movement
serving to transfer the open shutter onto said
40 arm whereby closing movement of said shutter
will be delayed until said signal arm has been
moved back substantially into said housing.
3. A direction turn indicator comprising a
housing having a shutter hinged at its upper
45 edge to the open side thereof, a signal arm
pivoted to and normally within said casing, a
cam pivoted concentric to the axis of the sig
nal arm for limited pivotal movements in re
spect to the arm, and power means operating
50 on said cam and through said cam on said
signal arm, said cam being operative to impart
initial movement to said shutter in-advance of
the movement of said arm.
4. The structure defined in claim 3 in which
the means for operating the signal arm includes
a ?uid pressure motor, a rack operated by the
fluid pressure motor, and a pinion carried by
said cam at a point concentric with its pivot
and meshing with said rack.
5. A direction turn indicator comprising a
housing having a hinged shutter at its exposed
side, a signal arm normally contained within the
casing and pivoted near one end thereof to the
casing by means including a double-ended trun
65 nion extending between opposite walls of the
casing, a cam pivotally mounted on said trun
within said housing, a cam having a limited
pivotal movement in respect to said arm, and
power means operative on said cam and through
said cam on said signal arm, said cam being
operative to impart initial opening movement
to said shutter in advance of the movement of
said signal arm, said cam at the limit of its 30
outward movement serving to transfer the open
shutter onto said arm whereby closing move
ment of said shutter will be delayed until said
signal arm has been moved back substantially
35
>
8. A direction turn indicator comprising a
housing having an open exposed side, a shutter
hingedly connected to the open side of the hous
ing and normally closing the same, a signal
arm pivoted to and normally within said hous 40
ing, a cam pivoted concentric to the axis of the
signal arm for limited pivotal movements in
respect to the arm, and power means operating
on said cam and through said cam on said sig
nal arm, said cam being operative to impart 45
initial movement to said shutter in advance of
the movement of said arm.
9. A direction turn indicator comprising a
housing having a hinged shutter at its exposed
side, a signal arm pivoted to and normally with 50
in said housing, means for swinging said arm
to and from projected position, and means for
into said housing.
imparting initial opening movement to said
shutter in advance of the movement of said
arm from normal position, said means for mov
ing the signal arm including a motor cylinder,
a piston working in the cylinder and connected
to the signal arm, a source of compressed ?uid
connected to the motor cylinder, and a valve
for controlling the flow of motor ?uid.
60
10. The structure de?ned in claim 8 in which
the means for operating the signal arm includes
a ?uid pressure motor, a rack operated by the
?uid pressure motor, and a pinion carried by
said cam ata point concentric with its pivot 65
and meshing with said rack.
CARL M. ROAN.
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