Патент USA US2136970код для вставки
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. - ~ 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 ' ‘ ~ - 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.