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Патент USA US2108342

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Feb. 15,1933. '
2, 108,342
Filed Sept. 12, 1933
3 Sheets-Sheet 1
zqraém W‘Zefédke.
15 1451-0‘
Feb. 15, 1938.
Filed Sept. 12, 1953
is Sheets-Sheet '2"
£65 1425107726195.
vFeb. 15, 1938.
2,108,342 _
Filed Sept. 12, 1935
$.Sheets-Sheet 5
jgroézz Wlefédre.
Patented Feb. 15, 1938
Arden W. Le Fevre, Chicago, 111., assignor to
Stewart-Warner Corporation, Chicago, 111., a
corporation of Virginia ‘
Application September 12, 1933, Serial No. 689,103
2 Claims. (01. 116—129)
The purpose of this invention is to provide a
dialed instrument with an indicator dial adapted
to be illuminated from the interior at the point
of the graduated element at which the index ele
i ment is registered with the indicating gradua
tions, and having interior illuminating means;
whereby the indication of the dial can be read
at night without having the aid of exterior illum
inating means.
Other speci?c and collateral purposes are in
dicated in the speci?cation.
The invention consists in the elements and fea
tures of construction shown and described as in
dicated in the claims.
Figure 11 is a face view of the same, similar inv
characteristic to Figure 5, that is,‘ showing the
instrument seen in Figure 9 under the conditions 5
de?ned in the description of Figure 5.
Figure 12 is a. section at the line l2—|2 on Fig
ure 9.
Figure 13 is a face view of the ?xed element
shown in Figure 9.
Figure 14 is a face view of indicator disk of the
instrument shown in Figure 9.
Referring to the drawings in detail, and ?rst
vention in a speedometer.
Figure 1 is a face view of an instrument of the
character of a combined speedometer and odom
III-10 on Figure 12.
- to the ?gures showing the embodiment of the in
5m In the drawings:
removed, as at a plane indicated by the line
The instrument casing is seen indicated in en
eter having its speed-indicating dial element con
structed and arranged for embodying this in
tirety at A, with the face plate, A1, constituting
the ?xed element of the dial made of transparent
material, as glass, having'an annular zone, 30, of
its surface de?ned between inner and outer con- 20
centric circles, 3| and 32, at which said face plate
is rendered thorough-1y opaque by suitably dark
Figure 2 is a section at the line 2-2 on Fig
ure 1.
Figure 2E is a section at the line 2L2“ on Fig- . ‘ colored surfacing coating applied to the inner
surface of the face plate, said zone, 30,- being
ure 2, on a reduced scale.
Figure 3 is a face view of the ?xed element of
the dial having the graduations.
Figure 4 is a face view of the oscillating or
rotary element having the reading index.
Figure 5 is a. view similar to Figure 1, but show
) ing the graduations as they may be presumed to
rendered translucent by suitable 1ight-co1ored'25
coating applied to the inner surface. The trans
lucent zone, 30, carries the speed graduations,
seen at 33, at the inner circumference of said
zone, and thus at the inner circle, 3 I, above men- .
tioned, and in said translucent zone are seen the 30
appear in! the absence of daylight or exterior ‘il
numeral markings indicating ‘miles per hour of
lumination, and when the interior illuminating
lamp is energized, thatis, imperfectly readable
speed from zero to 130. A central circular area of _
as indicated by the delicate delineation of the
i graduation numeral markings contrasted with
the bold line delineation of the illuminated grad
uation numeral with which the index is regis
Figure 6 is a face view of a shield interposed
' behind the oscillatory or rotary element for cer
tain purpose hereinafter explained.
Figure 7 is a detail view of'an index arrow
Figure 8 is a section at the line 8-8 on Figure
5, having the part, B, exaggerated as to thick
ness so that certain cross-hatching may be read
able for indicating color.
Figure 9 is a face view of the control device of
a radio-receiving instrument embodying this in
vention, the dial graduations including numeral
the face plate, indicated at 31, is rendered‘ com
pletely opaque (except as to openings in the
opaque coating hereinafter mentioned) by suit- 35
table dark coating applied to the inner surface of
said central area; and there is thus de?ned be
tween said inner circular area and the translu
cent zone, 30, a transparent annular zone, 38.
The openings in the opaque coating above re- 40 .
ferred to, seen at 3‘!3 and 31”, are necessary for
exposing the odometer mileage travel readings
_of the elements 31° and 31d. These odometer
elements are also seen in their circular outline in
Figure 2.
designations of sending stations with which the
wardly protruding ?ange, 43, of the casing in the
radio-receiving instrument is to be tuned. .
familiar manner of such instruments.
The oscillating element of the dial is seen at B,
FigureiO is a face view of the same with the
bezel and crystal and ?xed element of the dial
The face plate, A1, is shown held in ?xed posi
tion on the front shoulder, 40, of the casing by
being clamped thereon at the outer circumfer
ential margin of said face plate by‘the bezel, 4|,
which carries the front ‘glass closure plate or 50
crystal, 42, and which is clamped to the out-i
carried by the spindle, 45, of the spring-resisted 55
oscillator of the speedometer which may be illuminates the outline of the arrow head, 50,
understood to be of the magnetic type, in which so that by both illuminations the arrow head is
the oscillator is the magnetic drag element, seen clearly visible for thus locating the registration
at 46.
The oscillating dial element, ‘.8, which is light
colored as to its front face, has a central open
ing indicated at 41, rendering it annular with
radial spokes, 48, connecting its annular part
of the middle point of the window with the grad
For the purpose of rendering the illumination
of the index arrow through the pane, 55, therein
uniform at all positions of the' arrow head as it
with the central hub, 49, by which it is mounted is carried successively into indicating registra
10 on [the spindle, 45, as described; and it is pos1-' tion with the successive dial markings, there is 10
tioned back of the graduated ?xed element, A1, shown mounted in ?xed position ‘behind ‘the os
and spaced therefrom as seen at 39 in Figure 2 cillating element, 13, secured to the casing, as
sufficiently to ensure freedom from frictional indicated at 63, and spaced back from the ele
‘contact therewith, and for the further purpose ment, B, as bythe slight bead, 5B, protruded
‘hereinafter explained of having the advantage of
from the rear face of the element, B, as seen in 15
the light color of the oscillating element for Figure 2, a shield plate, 65, peripherally shaped
,di?using the interior illumination as hereinafter and dimensioned to cover or shield from the
‘described. At the proper point in the annular beams of light issuing from the lamps, 60, 60, all
of the area of the face plate, A1, within the inner
zone of the oscillating element, B, which is be
hind the transparent zone, 38, of the ?xed ele , circumference of the translucent zone, 30, of the
ment, A1, the element, B, carries an index mark face plate, said shield having an area, 65!, cor
responding to the blackened opaque central area
shown in the form of an arrow head, 50, for day
light reading on the graduated dial element of of *the face plate and having» the area extending
the indication of the instrument, according to the radially therefrom between the initial and ?nal
25 registration ofsaid index mark with the gradua
graduation markings similarly blackened, the re
tion of the ?xed element, and in the zone, 52, of mainder of the forward face of the shield being
white. In the central blackened area of the
the oscillating element outside said ?rst men
tioned zone and coinciding with the translucent shield there are necessarily provided apertures,
zone 30 of the ?xed element, A1, said oscillating I55EL and 55‘), corresponding to the apertures, 31'
30 element has a window or light-transmitting
and 31b, of the face plate, A1, for exposing the 30
' opening, indicated at 53, which may be closed by odometer mileage travel readings. A further
a transparent pane indicated at 54, preferably service performed by this shield consists in con
colored any color, shown colored green; and with-' trolling the light which passes through the aper
in the surface area de?ned by the outline of said tures 65*‘ and 85b and between the circumference
35 arrow head index mark the oscillatory element of the shield and the bead 55 of the element B,
has a second light-transmitting aperture closed so that this light outlines the arrow-head at its
pane, 55, and also illuminates the annular gap
by a transparent pane, 55, shown colored red.
Within the casing at positions available by between the forward white face of the shield
reason of being unoccupied by the speedometer and the rear or inner face of the rotating ele
ment B. This light is thus ‘diffused uniformly 40
40 and odometer mechanisms and clear of mecha
nism between such location and the oscillating over the annular path in which the'arrow-head
dial element there are mounted illuminators,--‘ is carried by the rotation of the element B.
Referring to the construction shown in Fig
as illustrated two,--which, as shown, are electric
lamp bulbs, 60, which, when energized, illumi
45 nate the interior of the casing; and from these
illluminators some light passes, as above men
tioned, at 39, to the space between the member
B andthe face plate A1, de?ned by the translu
cent zone 30 of ‘the face plate, and at the same
50 time said illuminators cast a beam of light
through the window, 53, of the oscillatory ele
ment, B, rendering the area of that window
prominently ‘luminous behind the graduations
.ure 9 in which‘ the invention is embodied in the
dial control device of a radio-receiving instru
ment: The casing is indicated at D, with its 45
face plate, D1, of transparent material constitut
ing the ?xed graduation-bearing dial element.
The rotating element having the index for read- ‘
ing the indication according to the registration
of the index with the graduations and the grad
uation numerals is indicated at E.
In this embodiment of the invention the trans
and numeral graduation markings of the ?xed ' parent zone, 10, of the ?xed graduation-bearing
55 element, A1, as the window is carried in the os- ‘ element, D1, is outside the translucent zone, ‘II, 55
rendered-translucent by a properly thin light
, cillation of the oscillatory element past the suc
cessive graduation markings; and by this means
the illuminated window becomes the index co
operating with the graduations for“ reading the
speed indication of the speedometer. Since to
enable reading these indications at any and all
positions of the oscillating element, the window
'must'have arcuate extent for lapping two con
secutive numeral markings, so that at least one
65 of them can be read, and since for accurate
reading the registration ‘of the middle point of
the arcuate extent of the window with the grad
uations should be noted, the index mark con
sisting of the arrowhead, 50, is located in radial
70 alignment with the middle point of the arcuate
extent of the window, and the illumination de
scribed includes a slender beam of' light cast
through the pane, 55, in the arrow head index
mark, and at the same time the re?ection af
75 forded by the crystal or front closure glass, 42,
colored coating on the under side; and said ?xed
element is without apertures at the central area,
and at that area, indicated at 12, is rendered
completely opaque by opaque dark colored coat-l
ing on the inner side. The rotatingv element, E,
which has the index arrow head, 13, for co
operating with the graduation numerals, 5 to 15,
for reading. the indication of the instrument,
carries said index mark, 13, in a zone of said
rotating element which is behind the transpar 65
ent zone, 10; and the window indicated at ‘I5
in the rotating element is located in the zone of
said element, E, which rotates behind the trans
lucent zone, ‘ll, of the face element; and as in 70
the ?rst describedv embodiment the rotatable ele
ment has its outer surface light colored for dif
fusing the light admitted through the window,
15, so that the outline of the index arrow-head,
13, which is radially aligned with the middle 75
point of the circumferential dimension of the
window, 15, is‘ rendered clearly visible‘ through
the transparent zone, 10, of the element, D1,
while the particular graduation numeral which
happens to be registered with the window, 15, is
lighted morebrightly than the other numerals _
of the translucent zone, ‘II.
In this embodiment the illuminating lamp
bulb, 80, is mounted in a suitable bracket mem
10 ber, 8|’, which is rigid with the hub, 82, of the
rotatable element, E, so as to be rotated with
the latter for carrying the lamp bulb maintained
in position directly behind the window, 16, so
that the illumination a?orded through the .win
15 dow is equal atall positions of the rotatable
I claim:
1. In a dialed instrument, in combination, a
casing, cooperating dial elements respectively
interposed between thevilluminating means and
the rotatable element and covering the area of
said element in which said index mark is lo
cated, said shield being spaced back from the
rotatable eiement and having an aperture out
of registration‘ with the index mark for; admit
ting light to the inter-space between the shield
and the rotatable element, the face of the shield
toward the latter being light-colored for di?usé
ing the light over the path of rotation of the 10
index mark.
2. In a speedometer, a dial formed with circu
larly disposed concentric zones, at least one of
said zones being translucent and having grad-V
nations thereon, an indicator disk mounted be
hind the dial and having opaque zones coter
‘minous with the concentric zones on said dial,
and a light source behind the indicator disk,
the latter having radially spaced indicating win
and rotatable,the ?xed element having an dows through which the light source may be
v20 ?xed
annular zone carrying the dial graduations, the , directed through the concentric zones in the
movement 01.’ the indicator disk, one of said win
rotatable element being an opaque disk carry
ing an index mark having its terminal portion dows serving as anindex mark, the indicator
disk and dial being provided with transparent
disposed for registration with the dial gradua
areas registering with each other to permit the 25
mitting aperture in the rotatable element, an observation of the digits of an'odometer.
“ illuminating means within the casing, a shield
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