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Патент USA US2136970

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Nam £5, EQB?
H. R EKEBÈRG
FLUID COMPASS
'Filed March 29, 1957
¿$6,970
Patented Nov. 15, 1938 y _
_
N
2,136,970
i ÍUNlT-EDÍ'STATES PATENT OFFICE
Henning Rudolf Ekeherg, Stockholm, Sweden, as
signor to Aktiebolaget Svenska «Elektro-Inl
dustri Companiet, Stockholm, Sweden, a
limited company of Sweden
‘Application March 29, 1937, Serial No. 133,667
In Sweden April 8, 1936
The present invention refers to'an improve
ment in compass casings _ñlled with a damping
liquid, and theinvention has for its object to
ensurechanges of volume of the liquid at vary-ç
ing temperatures, 4without incurring the risk of
'
projection 8 adapted'to limit the movements of
the compass needle by abutting against the cover
I, so that the. compass needle cannot fall oir the. ,
pin
4.
y
_
l.
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~
The liquid, such as'petroleum,- which serves to 5
the formation of vesicles or leakage. Further
damp the swinging movements of the compass
more, 'the invention refers to an arrangement forÍ v needle _is ñlled in through a little aperture l5 in
the suspension of the compass needle, in a man
the cover portion I5. To 'facilitate the ñlling, and
ner such that the distance of the needle from in order >with certainty to remove all air out of
10 the upper side of the casing remains substantially l
the casing 'as well as from the damping liquid, 10'
constant.
y
A
.
According to the invention, the ñrst-mentioned
the filling is preferably effected under vacuum.
Secured to the outside of the ‘annular flange 2
object is realized by the liquid being~ enclosed _ of the cover portion is a ring I 6, >for instance
within a chamber formed of a cover portion of
15 transparent material and ~a. thin resilient bot~-
tom portion secured thereto, this bottom portion
being adapted to adjust itself to the changes of
volume of the enclosed liquid caused by variations
in temperature.
20
The latter object is fulñlled, according to `the
of aluminium, rhodoid, cellon or the like, said
ring serving as a fitting or attachment for the> 15.
compass casing.
'
The annular?langes II and- I2 of the partition
3 and the bottom 9 respectively pass over into
the partition 'and the .bottom respectively through
correspondingly curved portions, so that the 2g
invention, by the compass needle being arranged „ ilange I2 will enclose the outside of the flange II
on a pin Whichis carried by an intermediate as tightly as possible. The ñange I2 may be`
partition or bridge, a frame or the like arranged curved inwardly and downwardly at the top, as
between the transparent cover and the resilient‘ shown in the drawing, so as to grasp about the
bottom, the said partition or the like being pro
upper edge of the flange Il.
' _
25
vided with openings and being so arranged that
Provided in the intermediate partition 3 are
the distance of the needle from -.the cover re
two openings I3 adapted to connect the space I0
mains substantially consta-nt in spite of the move-v with the space I4. In the embodiment shown,
ments on the resilient bottom.
the .openings are radially arranged and extend4
Qther features characteristic> of the invention outwardly so far as to pass into the curved por
will be explained more fully in the following with tion connecting the partition 3 proper with its 30
reference tothe f_orms of embodiment illustrated ilange I I. Any air bubbles occurring 'in the space
in the accompanying drawing.
>Ill may thus be caused readily to escape through
Fig. 1 shows an embodiment in longitudinal the openings I 3_ by- vtilting the compass casing.
35 vertical section. Fig. 2 is a plan view of Fig. 1. >After the ñlling of the casing has been completed, 35 _
Figs. 3 and 4 represent details. '
-
the' aperture I5 is closed. `
In Fig. 1, I designates the cover portionv formed
If desired, a ring IB, for instance of aluminium,
of cellon, Celluloid, glass or other suitable trans
rhodoid, cellon or the like, may be secured on the
parent material, said cover being provided with av ` outside o1' the annular flange 2 of the cover, said
40 >downwardly directed annular flange 2. Pasted _' ring I6 serving as' a iitting or attachment for the
to the inside of the flange 2 is the upwardly dl
compass casing. To this end, it may be .provided
rected annular flange I2 of aresilient bottom 9 'with an annular plane flange I‘I intended t‘ò'serve
of thin cellon or sheet metal, such as aluminium
as a support for the compass casing. Figs. 1, 3
plate or the like. The ilange I2 tightly surrounds and 4 illustrate three different constructions of
45 the upwardly directed annularviiange II oi an
the ring I6. In placeof the flange I'I the ring 45
intermediate partition 3 of comparatively thick I_B _may be provided with projections, for instance
sheet-metal, such as aluminium-plate, which is in the form of lugs, by means of which the com
bulged upwardly. The intermediate. partition 3 pass casing may be attached to a bracelet, for
ldivides the space between the cover I and the example. If desired,_t_;he`ringl I6 may be formed
K50 bottom 9 into two chambers IU and I4. Secured with a bottom to protect the thin resilient bot,- 50
_to the centre of the partition 3 is the pin 4 carry
tom 9.
ing the holder 6 of the compass needle 5, said
_ holder forming a ñtting for the jewel ‘I, for ln
stance agate, which rests on the point of the
55 pin 4. The holder 6 is provided with a disk-like
In the latter case. the ring forms a box.
'
In the construction according to Fig. 1, the
intermediate partition 3 is primarily conceived
as being made from sheet-metal, such as alu- w
2,136,970
2
minium-plate. ~ This, however, does not form any
particularly characteristic feature of the inven
tion, since the said bottom may be advantageous
ly made from celluloid, cellon or‘other trans
parent material, for example. If the interme
2 surround the flange I2 of the resilient‘bottom
,iportion 9, the flange 2 being instead formed in
diate partition is made from opaque material,
a manner such as to be surrounded by the flange
Il of the intermediatepartition 3.
what I claim isz-
while the bottom portion 9 is made from some
»
transparent material, it may be preferable to
-_
„
,
said cover, a closed chamber between said cover
and said bottom, said chamber being wholly
illled with a damping fluid, an intermediate par
I9, so that large openings are formed, through
which the bottom portion 9 and any chart or
map or the' like placed therebeneath. will beA
15 is shown in Fig.- 2 with chain dotted lines, the
-
Fluid compass comprising a cover of trans
parent material, a resilient bottom secured to
-make thel intermediate partition `3 in the form
14o of a vnarrow >bridge with parallel edge portions
easily visible. Such an alternative :construction
-
Having now particularly described the nature
of my invention andthe manner of its operation
tition secured between the bottom and the cover
anddividing theA chamber into an upper and a
` lower space, means of communication' between 15
said spaces provided'in said partition, a compass
needle in said. upper space, means secured to
If the bottoni- portion 9 consists of transparent ’ said partition for journalling the compass needle,
openings in thefintermediate;` partition being
denoted by
20
I8
therein.`
'
y
'
‘
~
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material, and if the j vintermediate-partition 3,
should Isuch partition be brought into use, is
transparent or provided`~withlargeopenings, it
may be of advantage-'to provide the iirst-men
tioned bottom'portionj with parallel lines for the
purpose of orientation of the compass on a map. _
25
If desired, the' intermediate partition may be
provided with su'ch lines.
`
Obviously, the shape of“ the cover portion l
may be varied within `wideïlimits.v For example,
an upwardly directed annular flange provided
_on said partition, an/,upwardly directed annular
20
ilange provided on said resilient bottom, the last
named flange being concentric with and- tight
ly ysurrounding the first named flange, the upper
edge of said flange of the resilient bottom being
curved inwardly and then downwardly about the 25
upper edge of Vsaid flange of the intermediate
partition, a downwardly‘directed annular flange
provided on said transparent cover and con
centric with and tightly surrounding said flange
it may be bulged’ln an accentuated,manner> so ` of said resilient'bottom, and pasting means be 30
30 as to form a portion of a spherical surface, which
tween `said nanges of the bottom and the cover.
under-certain circumstances may beof advantage '
to facilitate reading of the compass.
, Furthermore, it is not necessary that the flange` l
" HENNTNG RUDOLEEKEBERG.
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