Патент USA US2123381код для вставки
July' 12, 1938. V w. A. REICHE?L › , 2,123,38l> METHOD› OF' MAKING EXPANSIBLE DIAPHRAGMS _Original Filed Jan. 22, 1932 INVENTOR. I ATTORNEY . `2,123,331" 'Patentcd July 12, 1938 UNITED STATES PATENT OFFICE %123381 METHOD OF MAKING EXPANSIBLE DIAPHRAGMS Wladimir A. Reichel, Philadelphia, Pal, assignor to Bendix Aviation Corporation, South Bend, Ind., a. corporation of Delaware ' Original application January 22, 1932, Serial No. 588,223. Patent No. 2,070,751, dated February 16, 1937. Divided and this_ application July 12, 1935, Serial No. 31,129 8 Claims. (Cl. 29-1482) The present invention relates to _expansible and the cause of very serious contractible diaphragm devices such as are dis cl'osed in my co-pending application Serial No. 588223, ?led January 22, 1932, now Patent No. 5 2,070,751 dated February 16, 1937, of which the present application is a division, and more par ticularly to a method of making such diaphragm devices. ` ` Diaphragm devices made in accordance with 10 the method of the invention are particularly suit results following re- / liance upon the reading of such a defective in strument particularly in an aircrait during a manoeuvre. consequently lt is of the greatest importance that diaphragm devices be so made as to be able to withstand rigorous tests and ex treme conditions, such as are due to high vibra tion and changes in pressures and tempera ture to which aeronautical instruments particu 10 larly are subjected. Accordingly one of the objects of the present able for use in certain types of precision measur ing instrumente such as sensitive pressure gauges, invention is to provide a novel method of mak aneroid barometers, hydrostatic fuel-lever gauges, air speed indicators, altimeters, rate of climb in ing the same, whereby the foregoing di?iculties are substantially eliminated and whereby instru ments embodying such diaphragm devices are 15 ploying a pressure sensitive element. rendered more precise. 15 struments, and in any other instruments em A'common method employed heretoiore, in mak Another object is to provide, in accordance ing diaphragm devices of the above type was to unite together two ?exible metallic diaphragms with the method of the invention, an expansible and contractible diaphragm device having a novel sealed connection which is not stretched, 20 20 having rim portions extending axially of the dia phragm device and out of the planes of the dia- ` strained nor disturbed in any manner during normal operation of the diaphragms constituting phragms in overlapping relation. ` Another common method was to connect and ` 25 'i seal the peripheral edges of the diaphragms to an immediate cooperating shell structure in such , a manner that in operation the sealed connection the diaphragm device, thereby preventíng errors_ due to leaks and hysteresis. Another object is to provide a novel method 25 of making an expansible and contractible dia i was stretched or strained' in tension, i. e.,- when a pressure was exerted inside of the diaphragm phragm device which has its oppositely dlsposed device. the peripheral edges tended to pull away 30 from the supporting shell, thereby tending to sealed connection in such a manner'that the break the sealed connection between the dia phragms and` the shell. - In the ?rst method it has been endeavored to make and maintain the diaphragm devices air 35 tight by sealing the two overlapping rims of the diaphragms, and in the second method by scaling the peripheral edges of the diaphragms to the exterior surface of the supporting shell. It has' been frequently found, however, that expansible 40 diaphragm devices made in accordance with the ?rst method failed because of leaks occurring as a result of the parting of the bond between the sealed rim portions, and those made in ac ` cordance with the second method generally failed 45 because of hysteresis errors produced by the stretching of the sealed connection. In instru ments of the type referred to above such leaks and hysteresis errors present a serious problem and are largely responsible for many of the` 50 inaccuracies prevaient in such instruments, diaphragms Secured to a supporting shell by a force created 'by' the pressure preponderating 30 inside of the device tends to press the peripheral edges of the diaphragm against the shell rather than away from it so that the sealed connec tion is compressed instead of stretched whereby delayed restitution or hysteresis is prevented and 35 the possibility of leaks substantially eliminated. Still another object is -to provide a `novel method of making expansible diaphragm de vices which method comprises, forming a pair 40' of corrugated ?exible diaphragms so as to have inturned peripheral ?anges, securing said dia phragms to a supporting shell in such a manner that the peripheral ?anges of the diaphragms abut against the interior of the shell, and plac ing sealing material, such as solder, at the place 45 where the exterior surfaces of the diaphragm` ?anges abut against the interior surface of the supporting shell so ,that the preponderating pressure inside of the box tends to press the ?anges of the diaphragms against the support 50 thereby impairing or completely destroying their .ing shell without disturbing the scaling mate emciency as pr?cision Instruments. In an altim ` eter, for example, these errors may amount to several hundred feet which would render the in 56 strument wholiy unreliable and might even be: rial. ~ ` , The above and other objects and advantages of the invention will appear more fully herein ai'ter from a consideration of the detailed de 55 2 2,123,381 scription which follows, taken together with the accompanying drawing wherein are illustrated two embodiments of the invention. It is to be expressly understood, however, that the draw ing is merely for the purpose of illustration and description and is not designed as a de?nition from as is the case in diaphragm devices of prior construction. Referring to Fig. 2 wherein there is illustrated another form of expansible and contractible dia phragm devices made in accordance with the method of the invention, the supporting shell 3 of the limits of the invention, reference being had for this purpose to the appended claims. In the drawing wherein like reference numerals 10 refer to like parts in the two views, Fig. 1 is a sectional view showing one form of is cylindrical as in Fig. 1, but is not provided with any peripheral ?anges. The diaphragms 6 and 'I are again formed to have peripheral ?anges 8 and 9, but the width thereof is slightly less than 10 that of the ?anges shown in Fig. 1. The edges diaphragm device embodying the present inven- > of the fianges 8 and 9 abut against the interior tion; and wall of the shell 3 so as to form an annularacute Fig. 2 is a sectional View showing another em angular space therebetween for receiving the seal 15 bodiment of the invention. ing material, such as solder, which forms the an 15 The diaphragm device made in accordance with nular air-tight connections ll] and il. Hence, the method of the invention is constituted by a when there is a preponderance of inside pressure supporting memberror shell, preferably cylindri cal and a pair of oppositely disposed metallic 20 over outside pressure of the diaphragm device the annular seals ID and H are not stretched nor diaphragms which have their peripheral edges strained in tension and the forces acting o'n the 20 Secured to said supporting shell. In the form sealed connection are forces of compression so shown in Fig. 1 of the drawing the supporting that very little, if any, distortion or disruption of shell comprises a cylindrical member 3 having ?ange portions 4 and 5 projecting inwardly at a 25 suitable angle to provide an annular reinforcing wall against which the diaphragms are adapted to press when there exists a preponderating pres sure inside of the diaphragm device. The dia phragms, which may be of any suitable ?exible 30 material and preferably of thin sheet copper, are indicated at 6 and 'I and are corrugated in the the seals occurs, with the result that the amount usual manner to provide the required ?exibility. The diaphragms are also formed, as by stamping, so as to have peripheral or rim ?ange portions 8 35 and 9 projecting out of the planes thereof and of restitution, and therefore hysteresis, is greatly reduced and the possibility of leaks is substantial 25 ly eliminated, the solder acting as a seal between the diaphragms 6 and 'i and the supporting shell 3. There is thus provided a novel and improved method of making an expansible diaphragm de vice having the diaphragms thereof so arranged 30' that there is no tendency of disruption of the seal between said diaphragms and the supporting shell to which they are Secured. The annular sealing connection between the supporting shell and the diaphragms is also Situated and joined thereto so 35 at an angle corresponding to the angle at which that movements of the diaphragms due to changes the ?anges 4 and 5 of the supporting shell 3 are turned inwardly. The diaphragms 6 and 'l are arranged against the supporting shell 3 in such a 40 manner that the exterior surfaces of the ?anges 8 and 9 abut against the interior surfaces of the of preponderating internal pressure within the diaphragm device does not stretch the scaling ma terial of the connection. The diaphragm ?ange ?anges 4 and 5, respectively, thereby providing a relation between the diaphragms and their sup porting shell such that the former press against 45 thelatter during normal operation of the dia portion extends inwardly of the bounding shell at an angle' defining with said shell an obtuse angle at the preponderating pressure side, and the diaphragm ?ange portion is soldered to the shell in such a way that the solder is not stretched or subjected to tension due to diaphragm move 45 phragm device. It is pointedout that in the forming of the diaphragm device, ?rst one ?ange, as for example the fiange 4, is turned in and the diaphragm 6 50 positioned thereagainst, and after diaphragm 6 is secured to the shell then the other diaphragm 1 is inserted into the_ shell 3 with its peripheral fiange 9 extending inwardly of the device and the ments occasioned by changes in such preponder ating pressure. While two forms of expansible diaphragm de vices embodying the method of the invention have been illustrated and described, various changes in the sequence of steps of the method and in the form and construction of the devices, peripheral edge of the shell 3 is then bent or spu'n 55 to provide the peripheral ?ange 5 which cooper ates with ?ange 9 of the diaphragm 1. The dia may be made without departing from the scope of the invention. _Reference is, therefore, to be 65 phragms are secured to the shell in any suitable manner as, for example, by brazing or by placing OO suitable scaling material, such as solder, between the inner edges of the shell ?anges 4 and 5 and the outer face of the diaphragm ?anges l and 9 to form two annular sealed connections indicated at ?o and I i. It will be noted from this arrange ment that the sealed connections ?o and II can not be stretched or strained when movements of the diaphragms 6 and 1 occur due to preponder ance of pressure_ inside of the diaphragm device over the pressure outside of the device as is the 70 case in Instruments in which expansible dia phragm devices of this type are employed, the reason for this being that the ?anges 4 and 5 of the supporting shell provide a reinforcement whereby the diaphragms bear against the shell during operation instead of pulling away there which will now appear to those skilled in the art, had to the appended claims for a de?nition of the limits of the invention. What is claimed is: * 1. The method of making expansible dia phragm devices, which method comprises form ing a pair of corrugated disc-shaped fiexible dia phragms so as to provide peripheral ?anges there on projecting at an acute angle out of the planes' thereof. providing a cylindrical supporting shell for said diaphragms, positioning said diaphragms in said shell at opposite ends thereof with their ?anges projecting toward each other and abut ting against the inner surface of said shell, and joining said ?anges to the inner surface of said shell to provide a sealed air tight connection 70 therebetween, thereby forming an air-tight closed chamber between the two diaphragms. 2. The method of making expansible dia phragm devices, which method comprises form ing a pair of corrugated disc-shaped ?exible dia 75 3 2,123,381 phragms so as to provide peripheral ?anges, thereof with their ?anges projecting toward each thereon projecting at an acute angle out of the other and against the inner surface or said shell. and joining said ?anges to the inner surface oi planes thereof, providing a cylindrical support ing shell for said diaphragms, positioning said diaphragms in said shell at opposite ends thereof with their ?anges projecting toward each other, spinning the ends of said shell over the ?anges said shell to .provide a sealed air tight connec tion therebetween. 6. The method of making expansible dia phragm devices, which method comprises form of the diaphragms in abutting relation thereto. ? ing a pair of circular ?exible diaphragms so as a and joining the spun-over ends of said_ shell to provide peripheral ?anges thereon projecting 10 with the ?ang'es of the diaphragms to form_ a out of the planes thereof, providing a cylindrical 10 supporting shell for said diaphragms, position sealed air tight connection therebetween, there by forming an air-tight closed chamber between ing said .diaphragms in said shell at opposite the two diaphragms. ends thereof with their ?anges projecting toward› 3. The method of making expansible dia each other, spinning the ends of said shell over phragm devices, which method comprises form the flanges of the 'diaphragms in abutting rela ing a pair of corrugated disc-shaped ?exible di tion thereto, and joining the spun-over ends of aphragms so as to provide' peripheral ?anges said shell with the ?anges of the diaphragms to thereon projecting at an acute angle out of the form a sealed air tight connection therebetween. planes thereof, providing a cylindrical supporting '7. The method of making expansible dia shell for said diaphragms and of substantially' phragm devices, which method compr?ses form-` 20 the same inside diameter as the diameterof said, ing a pair of circular flexible diaphragms so as diaphragms, positioning said diaphragms in said to provide peripheral ?anges thereon, providing shell at opposite ends thereof and a su?icient a cylindrical supporting shell for said dia distance inwardly of said ends to provide end “ph'ragms and of substantially the same inside portions on said shell for spinning over _the diameter as the diameter of said diaphragms, ?anges' of the diaphragms, `spinning said ends positioning 'said diaphragms in said shell at op over said ?anges, .and joining said spun-over ends with said?anges to ,form a sealed air tight connection therebetween, thereby form?ng an air tight closed chamber .between the two dia phragms. ` , . ' 4. The method of making expansib?e dia phragm devices, which method comprises form ing a pair of circular ?exible diaphragms so as to provide peripheral ?anges thereon project ing out of the planes thereof, providing a cylin drical supporting shell for said diaphragms, spinning one end of said shell inwardly to pro posite ends thereof and a suí?cient distance in wardly of said ends to provide end portions on said shell for spinning over the ?anges of the diaphragms, spinning said ends over said ?anges, 30 and joining said spun-over ends with said ?anges to form a sealed air tight connection therebe tween. › ` 8. The method of making expansible dia phragm devices, which method comprises form ing a pair of corrugated disc-shaped ?exible dia phragms so as to provide peripheral ?anges thereon projecting at an acute angle out of the vide a ?ange, inserting one of said diaphragms _ planes thereof, providing _a cylindrical support ing shell for said diaphragms, spinning one end 40 of said shell inwardly to provide a ?ange pro jecting inwardly at an acute angle, inserting one that the `flange ~ of ~ said diaphragm abuts the ?ange of the spun end of the shell, joining said of said diaphragms from the other end of said ?anges together to provide a sealed air tight con- i shell, positioning said diaphragm. in said shell against the spun end so that the ?ange of said nection therebetween, inserting the other_ dia phragm into the shell with the ?ange facing the diaphragm abuts the ?ange of the spun end of from the other end of said shell, positioning said diaphragm in'said shell against the spun `end so shell to close the' open en'd of said shell. spin .ning said open end of the shell inwardly to form a ?ange providing an abutment for the ?ange the shell, joining said ?anges together to pro vide a sealed air tight connection therebetween. inserting the other diaphragm into the shell with of the second diaphragm, and joining said last - the ?ange facing the shell to close the open end two ?anges to provide a sealed air tight con nection therebetween. , ` i i of said shell, spinning said open end of the shell 50 inwardly to form a second ?ange projecting in wardly at an acute angle and providing an abut ment for the ?ange of the second diaphragm, 5. The method of making expansible dia phragm devices, which method comprises form 55 ing a. pair of circular flexible diaphragms_ so as' ' and joining said last two ?anges to provide a 55 - to provide peripheral ?anges thereon pro?ecting I sealed air tight connection therebetween, there out of the planes thereof, providing a cylindrical by forming an air tight closed chamber between supporting shell for said diaphragms, positioning said diaphragms in said-shell at oppos?te ends v the two diaphragms. ' v WLADIJMIR A. REICHEL.