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Патент USA US2123381

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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.
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