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Jan. 7, 1947.
w, MAKY
ELBOW PIPE COUPLING
2,413,878
_
Filed July 6, 1944
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Snventor
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Patented Jan. .7,‘ 1947
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1 UNITED spires- PATENT ol-"rica
Walter Maky, Cleveland, 011%, assixnor to The.
Parker Appliance Company, Cleveland, Ohio,
a corporation of Ohio
Applicationjllly 6, 1944, Serial No. 543,617
4 Claims. (Cl. 285-55) I
I\
1
The invention relates to new and useful im
provements in a coupling for securing an elbow
pipe to a ?xed part in different set. angular posi
tions relative thereto.
2
2
as a tank or the like._ The elbow pipe I has a
portion 2 which is adapted to be connected to
. the boss 3.
'
An object of the invention is to provide
pling of the above type with a sealing chamber
for housing a ring gasket vwhich is de?ned by a
smooth wall on the pipe, a smooth wall on the
boss and a smooth wall extending from the pipe
to the boss for closing said sealing chamber at 10
each set angular position of the elbow pipe.
A further object of the invention is to provide
a coupling of the above type wherein the sealing
chamber is so dimensioned relative to the gasket
that the gasket makes sealing contact solely with
the smooth wall on the pipe and the smooth wall
on the boss which is opposed thereto.
_A further object of the invention is to provide
Said elbow pipe has a-v right angle
portion 4 which is to be set at a desired angle
to the ?xed boss 3.
The boss 3 has a bore 5 therethrough leading ‘
to the tank. Said boss is counterbored at its outer
end so as to provide a smooth wall 6 which is to
serve as the outer wall of a sealing chamber for
a ring gasket. A section of the wall of the bore
of the boss from the smooth wall 6 inwardly
is threaded as indicated at 1. The portion 2 of
the elbow pipe has a threaded section 8 which
is adapted to engage the threaded section‘ of the
boss. The portion 2 of the elbow pipe is shaped
so as to provide a smooth wall 9 which is opposed
to the smooth wall 6 on the boss. This wall 9 '
forms the inner wall of the sealing chamber.
a coupling of the above type wherein the smooth '
As shown'in the present embodiment of. the
wall for closing the sealing chamber is formed 20 invention, the portion 2 of the elbow pipe is pro
integral with the pipe and wherein the pipe at
vided with a smooth wall l0 which is disposed
the outer edge of said smooth wall is shaped and
in a plane at right angles to the wall 9. This wall
dimensioned so as to telescope into the boss and
l0 forms the closing wall of the sealing chamber.
make sliding contact therewith.
.
Disposed‘within this sealing chamber is a ring
A still further object of the invention is to
gasket II. The ring gasket is of slightly less
provide an elbow pipe coupling having a lock *
nut with a stop shoulder against which the nut
may be engaged and utilized for limiting the ex
tent to which the elbow pipe may be threaded
into the boss, and wherein said nut may also be 30
utilized when the elbow pipe is backed oil‘ to a
desired set position for locking said elbow in
said set position.
diameter than the diameter of the smooth por
tion 9 so that it will contact therewith when it
is expanded and placed over the threads and then I
released for engagement with said smooth wall 9.
The ring gasket is dimensioned relative to the
width'of the sealing chamber, that is the distance .
between the smooth walls 6 and 9, so that it is
slightly greater in diameter than the diameter of
‘ These and other objects will in part be obvi
the smooth wall surface 6. The corner l2 be
ous and in part will hereinafter be more fully 35 tween the smooth cylindrical surface 6 and the
disclosed.
a
smooth surface l3 at the outer end of the boss
In the drawing which shows by way or illus
is'bumished or rounded slightly.
tration one embodiment of the invention
The gasket is placed on the portion 2 of the
Figure 1 is a longitudinal sectional view through Q
elbow pipe and then the portion 2 is threaded
the improved coupling for securing an elbow pipe 40 into the boss. The gasket is dimensioned so that
to a boss on a ?xed member, the parts being
when it contacts with this rounded shoulder I2 it
positioned for the entrance of the ring gasket
will be deformed and forced into the sealing
into the sealing chamber.
'
chamber. This deforming of the gasket changes
Figure 2 is a view similar to Figure lshowing - it to more or less of an elliptical shape and the
the nut pressed against the shoulder on the el 45' gasket will therefore make sealing contact with
bow pipe and utilized as a stop means. for limit
‘the smooth walls 6 and 9 by the inherent re
ing the extent to which the elbow pipe is thread
silience of the gasket.
.
ed into the boss.
,
The length of the sealing chamber, that is the
Figure 3 is a view similar to Figure 2 but show
distance between the smooth wall l0 and the
ing the elbow pipe as having been turned to a 50 threaded section, is of greater dimension than
desired set position by a partial unthreading
the major diameter of the gasket after it is placed
movement of the pipe in the boss and secured in
in the sealing chamber so that the seal between
said set position by the‘ lock nut. - I
the gasket and the parts is brought about solely
The invention is particularly adapted for join
by the expansion of the gasket. Any ?uid leak
ing an elbow pipe to a boss on a; ?xed part such
ing past. the threaded connection between the
2,418,878
3
,
elbow pipe and the boss and bearing on the gas
ket will increase the tightness of the seal. An
above notedthe closing well ill of the sealing
chamber is smooth and at right angles to the
4
a nut ‘threaded onto said pipe and adapted to
directly engage the end of the boss for locking
the elbow in a set angled position. said coupling
being shaped so as to provide a smooth wall dis
side walls of the recess in ‘which the gasket is
posed at right angles to the longitudinal axis of
positioned and therefore any deformation of the
the boss and extending from the smooth wall on
gasket by fluid pressure will ‘be’ resisted by the
the pipe to the smooth wall on the boss for clos
gasket‘ contacting with this smooth ?at surface.
This will increase the tightness of the seal through
ing said sealing chamber for all set angular posi
tions of the elbow and a. ring gasket in said seal
the tendency of the gasket under such force to 10 ing chamber dimensioned so as to make sealing
expand laterally.‘
contact by expansion with the opposed walls of
The elbow pipe has a smooth cylindrical por
the bore and the pipe.
‘
tion l4, a threaded section I5, and a shoulder
2.-An elbow pipe coupling comprising a boss
‘section iii. A look nut l1 engages the threaded
having a bore provided with a smooth section at
section l5 and is adapted to contact with the 15 its outer end and a threaded section extending
shoulder l6 for purposes hereinafter stated. The
inwardly from said smooth section, an elbow pipe
cylindrical section I4 is so dimensioned that it
having threaded connection withv said boss said
makes sliding telescoping contact with the smooth
pipe having a smooth section Opposed to and
wall 6 of the boss. Therefore the wall “I which
spaced from said smooth section of the bore to
closes the sealing- chamber extends all the way 20 provide a sealing chamber for a ring gasket, a
from the wall 6 to the wall 9 and there is no
nut threaded onto said pipe and adapted to di
possible chance of the gasket being extruded so
rectly engage the end of the boss for locking, the
as to project between the nut and the boss. As
elbow, in a set angled position, said pipe having
illustrated, the nut does not make contact at any
a smooth section disposed in a plane at right
time with the gasket.
25 angles to the axis of the boss and extending from
- In the assembling of the parts, ‘the nut is
the ?rst named smooth section on thepipe to the
placed against the shoulder l6 and then the por
smooth section on the boss for closing the seal
tion 2 of the elbow pipe is threaded into the boss
ing chamber, said elbow pipe having a smooth
until the nut contacts with the end of the boss.
cylindrical surface adapted to telescope into the
This limits the extent to which the portion 2
boss and make sliding contact with the smooth
of the elbow pipe can be threaded into the boss
wall on the boss for all angular set positions of
and it insures that there shall be ample threaded
the elbow, and a ring gasket in the sealing‘
connection so that the elbow pipe may be turned
chamber, which {ring gasket is so dimensioned
or backed off for the setting of the elbow pipe in
as to contact solely by expansion with the op
any desired position relative to the‘ boss. The 35 posed side walls of the sealing chamber.
length of the smooth cylindrical surface I 4 is such
3. An elbow ‘pipe coupling comprising a boss
that when the elbow pipe is turned to any angle
having a bore provided with a smooth cylindrical
within 360° for the setting of the same, said
section at its outer end concentric to the center
smooth surface will still be within the boss and
of the bore and a threaded section extending
the sealing chamber will be closed.
40 inwardly from said smooth section,an.elbow pipe
In Figure 2 the lock nut'is shown against the
having a threaded connection with said boss, said
shoulder and the portion 2 ofthe elbow pipe
pipe having a smooth cylindrical section concen
threaded into the boss to the limit of its move
tric to the center of the pipe and opposed to and
ment. In Figure 3 the elbow pipe has been
spaced from the smooth section of the bore to
turned so as to Partially unthread its connection
provide a sealing chamber for a ring gasket, said
with the boss and so as to set the projecting por
pipe having a second smooth cylindrical surface
tion 4 of the elbow pipe in a desired angular po- - concentric with the center of the pipe and di
sition relative to the tank to which the boss is
mensioned to engage within the bore and con
?xed. After this elbow pipe has been set in its
tact with the smooth surface at the outer end
desired angular position, then the lock nut I‘! is
thereof and close said annular chamber and a
turned into contact with the boss and this will
ring gasket in said sealing chamber dimensioned
lock the elbow pipe in its set position. It is noted
so as to make sealing contact by expansion with
that there is a smooth metal to metal contact
the opposed walls of the bore and pipe.
between the nut and the boss.
4. An elbow pipe coupling comprising
From the above it will be noted that the smooth 55 threadedly engaged boss and elbow pipe members,
surface 9 and. the smooth surface M on the pipe
a ring gasket con?ned in a sealing chamber de
I are concentric with the axis of the pipe. The
lined by opposed spaced smooth wall sections on
smooth surface It makes a close ?t with the
the boss and the elbow pipe and a smooth end
smooth surface 6 on the boss and this will ensure
wall on the coupling disposed at right angles to
that the width of the gasket recess will be uni 60 the longitudinal axis of the boss and extending
form all the way around the pipe and therefore
from the smooth wall on the elbow pipe to the
the expansion of the gasket will make a tight seal
smooth wall on the boss, said end wall operating’
at all points.
‘
to close saidsealing chamber for all set angular
positions ‘of the elbow pipe and a nut threaded
onto said elbow pipe and adapted to directly en
gage the end of the boss for locking the elbow
pipe in a set angular position, said ring gasket
inwardly from said smooth section, an elbow pipe
being dimensioned so as to make sealing contact
having threaded connection with said boss,
by expansion with the opposed walls of the bore
said pipe having a smooth section opposed to 70 andthe elbow pipe.
and spaced from said smooth section of the bore
WAL'I‘ER MAKY.
to provide a sealing chamber for a ring gasket,
I claim:
1. An elbow pipe coupling comprising a boss
having a bore provided with a smooth section at
its outer end and a threaded section extending
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