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Патент USA US2127807

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Aug. 23, 1938,.
2,127,807 -
Filed Nov. 14, 1953
2 sheetsèsheet 1
.il, `
Aug. 23, 1938.
Filed NOV.- 14, 1935
2 sheets-sheeî 2
reuma Aug. 23,' 193sJ
. , '2,127.807
Bend, Ind..VNovember
a corporation
14, 1_933,
ot Serial No. 697,99’1`
s claims. ’ (ci. nsf-12s)
struments and, more particularly. to novel indi
:cating means therefor.
in its entirety.
v.Another object of the invention is to provide,
in an indicating instrument of Vthe above type, a ‘
The invention is particularly adapted to indi
novel index cooperating with the dial of the in
strument,4 which is so formed as to avoid parallax
and to provide complete illumination of said in
cating instruments of the type having an indi
cating dial mounted in a casing for angular move
and over the index, said index will be illuminated
The present invention relates tolindlcating in
ment or rotation about a vertical axis and hav
ing a` top portion and a downwardly extending ' dex when the illuminating source is located there- v
peripheral iiange on which are marked the scale v above.
' 'I'he above and other obje‘cts and advantages of 10
graduations of the dial, the latter being visible
through a cover glass provided on one side of the ' the invention -will appear morei fully hereinafter
casing. Such an instrument may bea compass, from a consideration of the detailed description
for example, in which the dial constitutes the
which follows, taken together with the accom--
compass card or it may be an automobile speed
panying drawings wherein one embodiment of
the invention is illustrated.` It is to be expressly 15
understood, however, that the drawings are for
ometer in which the dial is graduated to indicate
speed in miles per hour.V The instrument may'be
` constructed and arranged for mounting on an
the purpose of illustration and description only
instrument panel with/the cover glass of the in--
and are not designed as a deñnitlon of the limits "
strument positioned substantially in the plane of
of the invention, reference being had for this
the panel or, if a concave-convex cover glass of
purpose to the appended claims.
the lens type is employed, with the cover glass
projecting slightly from the plane oi’ the panel.
lleretofore, in- instents of the above type
In the drawings wherein like reference charac
ters refer to like parts throughout vthe several
there was provided an index, or iubber’s-mark in
the case of a compass which index was usually in
. Eg. l is a vertical section of one form oi in
the form ci a hair line, wire or strip extending
vertically in front ot the dial so that the scale
graduation ywhich coincided with the hairline
' provided the required indication or reading of
i the instmment. ln the case ci the compass, this
hair line or liibbei-"s marl; was usually in the
Íorui of an upwardly projecting curved wire car
strument embodying the novel index of the pres 25
ent invention;
Fig. 2 is a iront view of the instrument shownA
in Fig, l; and
Vlif'ig. 3 is a perspective view of the novel index
embodying the invention.
Referring to the drawings and, more particu
lariy, to liig. l, the instrument shown embodying
ried by the pivot post on which the ~card of the
the present invention is in the form of a magnetic
compass was pivotally mounted. @sich an index
compass of the liquid type wherein means' are
Y ci' lubber’s mark served its purpose satisfactorily
when the instrument was viewed in the day time.
When, however, illuminating means were pro
provided i‘or‘illuminating the compass card of the 35
compass from above as is the present general
practice in the compass art. its illustrated, the
vided for viewing the instrument atïnight and compass comprises a casing il within which is
_ ‘the source was located above the index or lubber’s
marit, which is the desired location in order to
provide suilclcient illumination ci the dial with
out undue glare, auch a’íorni ol index or lubber’s
line obviously could not be illuminated in'its en
tirety because the portion sloping inwardly to
ward the card and away from the direction. of
` the incoming light remained in the dark and 'only
the upper part of the curved index, i. c.t the part
nearer the source of illumination above the index »
was illuminated.
Accordingly, one of the objects of the present
invention is to provide, in an indicating instru
ment of the class described, a novel index where
_ by, when a Asource of illumination is' provided
contcincd o, compass card li plvotally mounted on
a pivot post t in any suitable manner lmown. in 40
the art. The card is substantially dat at the top
as shown at l and is provided with a downwardly
extending annular flange or rim t on which are
marked the compass graduations 9. ¿The card is
provided with a pair of bar magnets lll suspended 45
from the card by means of members il in order ‘
to impart magnetic North-seeking properties to
said card. A suitable cover glass l2, preferably
of the lens type, is provided at one end- of the
casing l and is secured thereto in any suitable 50
manner, as by means of‘a clamping ring I3 and
screws Il (Fig. 2). In order to dampen the com
pass card ,5, the compass bowl is ñlled with a
suitable damping liquid I5. An expansible dia
55 which is located above the iront part of the dial phragm device I6 is also provided at the real"` ‘of
the compass bowl for compensating for the ex
pansion and contraction of the liquid I5*A due to
cordance with. the present invention, the outer
temperature changes, the interior of said dia
, uousiy in the same direction, all parts thereof
phragm device being in communication with the
exterior of the bowl through an opening (not
shown) provided in the bolt I‘I by means of which
will receive light i’rom the source I9 through the
said device is secured to the rear wall I8 of the
compass bowl I.
Means are provided for illuminating the ‘_front
portion oi' the compass card, i. e., the portion
which is visible i'rom the front oi' the compass
through the cover glass I2 and, in the form
edge l5 is made to slope substantially contin
glass member 28, thereby facilitating therread
ing oi the indication on the compass card 5.
Also, because said index member is constituted
by a ilat strip having sides of substantial sur
face, said sides are also illuminated, thereby en
abling the viewing of the inner edge 34 more
readily against the compass card and avoiding
parallax which is always present when a hair
shown, comprise a lamp I8 positioned horizon- ' line ‘or wire is used. In other words, by virtue
tally in an auxiliary compartment 2| formed by of the fiat nature of the member 3| the card may
15 va removable drawer 2li which is adapted to be
be viewed from either side of said index without
inserted into the auxiliary compartment by'means giving an incorrect reading. It the index or
of a knob 22. The drawer 2li is so arranged that
upon the insertion thereof into the compartment
2| the lamp I9 is adapted to be connected to an
20 electrical circuit by means of a contact 23 car
ried by the drawer and a contact 24 carried by
the compass bowl 4 in the compartment 2|. Con
nested to the contact 2l is a conductor 25 which
leads to a receptacle 2l into which a plug 21 is
adapted to be inserted. Light from the lamp i9
is introduced into the interior of the compass
bowl l by means of a glass rod 28 carried by a
threaded member 2l which is screwed into an
opening 2l provided in the compass bowl I di-.
80 ‘rectly above the i’ront portion ot the compass
card I. Thus, when the lamp Il is energized.
light passes through the glass member 28 and
onto the front portion of the compass card.
» 'l‘he structure described thus far constitutes
a compass of the type disclosed and claimed in
a co-pending application of RaymondK. Stout,
Serial 'No. 650,520, ñled January 6, 1933, and
forms no part of the present invention except
insofar as it is required that the illuminating
40 means be above the compass card, such location
- being desirable for the purpose of .the present
invention. Cooperating with the compass card 5
is an index or lubber’s mark 3| carried by an
arm 32 secured to the member 33 carried by
s.. ai the pivot post I. In accordance with the pres
ent invention, this'index or lubber’s mark 3| is
so formed and arranged that when light is in
troduced into the compass bowl through the
glass 2l from the lamp I0, said index member is
illuminated in its entirety in order that it may
be' completely visible at night thereby enabling
reading of the compass card more readily.
illustrated, said index or lubber’s mark 3| is con
stituted by a ilat strip projecting upwardly from
the member 32 and in a vertical plane extend
n ing radially from the periphery of the compass
card so that the inner edge 3l is adjacent the
card and the'outer edge 35 is visible from the
front ot the compass through the vcover glass I2.
The inner edge 3l is curved concavely with the
concavity toward thef card so that the bottom
' , of the-flange I falls substantially half way be
lubber’s mark were in the form of a hair line
or wire, then ii.' the compass is viewed from the
>side the index’ will appear to be in alinement with
a graduation farther from the index in a direc
tion away from the observer. For example, ‘l1
the index 3|, shown in Fig. 2, were a hair line
instead of the fiat strip, then if the card were
observed from the left oi Fig.'2 the index might
appear to be in alignment with the graduation 25
25 or 26 on the' compass card instead of with the
graduation W. On the other hand, if the card
were viewed from the right ot Fig. 2, the index
would appear to be in alignment with gradua
tions 28 or 29. With applicant’s novel index, 30
such inaccuracy is not possible because the sub
stantial width of the strip indicates to the ob
server that his line oi.’ vision is not in the plane
of the index. He must, therefore, shift his line
of vision until it isfin the plane of the strip at 35
which time only the outer edge 25 will be visible.
There isy thus provided an indicating instru“
ment embodying a novel index member for co
operation with the dial ol the instrument Where
by, when the instrument is illuminated, said index
member is illuminated inf its entirety thereby
greatly facilitating the reading or the instru-.
ment and whereby, due to the novel form of said
index member, parallax is avoided.
Although only one embodiment of the inven
tion has been illustrated and described with
reference to a magnetic compass oi the liquid
type, it will be apparent to'those skilled in the
art that the invention may be' adapted to in
struments of other types such, for example, as an 50.
automobile speedometer having a, dial mounted
for angular movement or rotation about a ver»
tical axis, i. e., the broad principles ot the in
vention may be adapted to any~instrument having
a dial angularly movable or rotatable about a 55,
vertical axis and visible from the front of the
instrument. Various changes in the form and
relative arrangement of the parts may also be
made without departing from- the scope of Athe
invention. Reference is, therefore, to be had to
,the appended claims for a definition ot the limits
of the invention.
tween the upper end'and the lower‘end oi* the _» Whatisclaimed is:
` ilat stripl The outer Aedge Il is made to slope
substantially continuously in an outward direc
_ ,1. In an indicating instrument, an indicating
.dial mounted for angular movement about a 85
tion, i. e., toward the cover glass I2, the slope vvertical axis and having an annular rim with in
being such that the upper’end of the. strip is dicating marks thereon, and an index cooperating
relatively narrow and falls in alignment with with said rim and comprising a substantially fiat
the inner side ot the glass member 28, while the member positioned adjacent'said rim in a ver
lower end of the strip is relatively wide and the tical plane passing through said axis, the outerl 70
bottom o! the outer edge is relatively close to the ' edge of said member sloping substantially con-‘t
cover glass I2. Heretotore, this outer edge 3l tinuously outwardly of the dial from one end toñ
was curved in the same direction as the inner
the other of said member.
edge 3l inasmuch as the index was provided by
2. In an indicating instrument, an indicating
'II a curved wire. In view of the fact that, in ac-_ ' dial, means for illuminating said dial from the top
thereof, and an index member cooperating with
curved edge extending slightly over said card
'and the lower end of said curved edge extending
' positioned edgewlse with respect to said dial and - under said card, the outer edge of. said flat mem
said dial and comprising a flat vertical member
having its outer edge sloping> substantially con
tinuously outwardly from the top to the bottom,
ber sloping outwardly from the top to the bottom v
5. In a magnetic compass of the liquid type
said member being so positioned that said edge
including a casing having a front opening closed
may be illuminated in its entirety.v
3. In an indicating instrument, a'n indicating 'by a cover glass, a compass card- in said casing
-dial, means adjacent said dial for illuminating and having a .downwardly extending annular
the same, and an index member cooperating with flange with scale graduations thereon visible
10 said dial and comprising a substantially iiat through said cover glass, means above the front
member positioned _edgewise With'respect to'esaid edge of said card for illuminating the visible front
dial and havingl one end near the illuminating portion thereof, and a lubber’s mark comprising
a flat member positioned vertically in a plane
means and having its outer edge sloping substan
tiallyv continuously outward of the dial from that extending radially from said front edge of said 15
15 end of said member which is near, the illuminat
card and having a concavely curved inner edge
ing means whereby said outer edge is illuminated adjacent the edge of said card with the card subfstantìally midway between the endsof said curved
in its entirety.
4. In a magnetic compass of the liquid type, a . edge andthe upper end of the curved edge being
`compass card having a downwardly extending substantially under said illuminating means and
20 annular flange with scale graduations thereon, l the lower end of said curved edge extending under 20
and a lubber’s mark comprising a flat member
'said card, the _outer edge of said ñat member '
from the periphery of the card and having a
sloping outwardly ~from the top' to the bottom
thereof whereby said outer edge is illuminated in
concavely'curved inner edge adjacent to the pe
its entirety.
positioned vertically in a plane extending’ radially
25 riphery of said card with the upper `end of --said
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