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D6324» 1946-
Filed July 10, 1944
f 7?
,BY gaff JMW
Patented Dec. 24, 1946
Le Roy Vaught, Inglewood, Calif;, assignor of one
half to Roy W. Solomon, Inglewood, Calif.
Application July 10, 1944, Serial No. 544,155
1 Claim.
(Cl. 285—86)
My invention relates to a means for producing
an effective seal in transmitting lines used in
arrangement of parts ‘which will appear more
fully in the course of the following description.
the arts and industries for delivering ?uids under
However, the drawing merely shows and the fol
high pressure. In the aeronautical ?eld espe
lowing description merely describes embodiments
cially, it is of the greatest importance that ?uid Or of the invention which are given by way of illus
tight and leak-proof connections be available,
tration, or example only.
that they be maintained at all times and under
In the drawing, like reference characters desig-r
the various and severe conditions in which planes
nate similar parts in the several views.
must operate and be handled, and that they be
Fig. 1 is a sectional elevational View showing
capable of withstanding extreme pressures with 10 an embodiment of my invention.
out subjecting the connections to high torque
Fig. 2 is a sectional elevation of a sleeve used
pressure of a wrench.
in the embodiment of my invention.
Heretofore it has been customary to use rub
Fig. 3 is a sectional elevational view of a modi
ber, ?bre, wood, lead or other gaskets and devices
?ed form of embodiment of my invention, and
interposed between the elements of a pipe joint 15 Fig. 4 is a sectional view of a sleeve used in the
using a union nut to produce a seal and to pre
modi?ed form of my invention.
vent injury to abutting surfaces by application
Referring in particular detail to the drawing, a
of pressures that are .too high. But the employ
union coupling connection forming the subject of
the present invention and constituting the design
ment of these aids has not avoided the liability
of damage to them when great wrench pressure
now most generally followed in aircraft construc
is applied, nor has it yielded a satisfactory connec
tion, is shown as comprising a tubular conduit l0"
tion proof against leaks and capable of with
?tted or provided at one end with an axially bored
standing high pressure. Where the ?aring type
body ll, having a nut portion 12 at one end, for
of tubing is used, the high torque resulting from
a wrench or other member, a nose or rounding
the use of a wrench to insure a tight connection 25 abutment l3, projecting beyond the other end of
has so injured the ?are by rupturing it or crack
said body, and external threads I4. An inter
ing it or damaging it otherwise that it is unable
nally hreaded union nut l5, engages the external
to hold pressure and prevent leaks.
threads M of said body 1! and by rotation is
adjusted relatively .to and on said body ll. The
This invention relates to a‘?uid seal or pipe
connection in which two associating parts may
union nut I5 is provided at one end with an in
have a metal to metal contact to insure a‘ seal‘
wardly directed ?ange IS, the inner face of which
under very high pressures. The invention is ap
is preferably dished or cupped,’ as'seen at A and
plicable chie?y to that type of tubing now almost
provides a seat for a tubular sleeve or thimble I‘!
that ?ts relatively loosely upon or over a conduit
generally used in aircraft in which the end to
element l8 which is complementary to the said
be united in and by a union with a conduit is
tubular conduit ID with which it is to be associ
ated by connective pressure, as will appear later.
One of the chief objects of this invention is to
provide a simple ?tting in which a seal between
The sleeve or thimble i‘! has a radially extend
the joint may be effected and the joint tightened
ing portion [9, of a diameter greater than the in
to a leak-proof pressure with a low wrench torque 40 side diameter of said inwardly directed ?ange l6
and without he use of gaskets or washers.
and of greater cross-sectional area than that of
its tubular portion, providing thereby a portion
Another object of this invention is to provide a
simple and e?icient seal for ?uids in pipe or con
of increased weight and strength and being there
duit connections in which the seal is effected by
by reinforced to withstand the pressure imposed
a metal to metal contact and in which the seal is
upon it. The outer face of the portion 1 9 is
proof against rupture or disturbance by internal
curved or rounded, as seen at B and conforms
pressure and requires no excessive wrench pres
to the shape and outline of the dished or cupped
sure to associate it in a line.
inner face A of the inwardly directed ?ange l6
My invention also has for its objects to provide
of the nut l5. The upper or inner face of said
such means that are positive in operation, con 50 portion 19 is provided with an annular recess
venient in use, easily installed in a working posi
I9’ inward from the exterior of said radially ex
tion and easily disconnected, economical of manu—
tending portion l9, and the upper edge of said por
facture, simple and of general superiority and
tion I9 is preferably inwardly beveled, as seen at
The invention also comprises novel details an 55
The conduit element of any suitable material
capable of withstanding high pressures, such as
brass, copper, steel, or alloys, and that may readily
be ?ared, is formed or provided at one end with
a ?are or outwardly spread radially extended
tion, none but a true axial alinement of the
complementary parts forming the union is pos
sible, that they are self seating, and that for this
reason, the face to face contact of the metal
portion 2|, the outer face of which is shaped to ?t (Ii surfaces is a positive insurance for a perfect
seal and a protection against distortive action
exactly the recess l9’ in the radially extending
portion 19 of the sleeve or thimble and the inner
face of which conform as exactly to the outline
of a wrench or other member used to combine
the associable elements.
or contour of the nose or projection I3 of the
The modi?ed structure shown in Fig. 3 is in
conduit [0. By manipulation of the union nut
l5 or by wrench-operation thereof, said nut is
adjusted on the body I I and during such adjust
form in that the body ll of the tubular conduit
ll}, is provided with a conical projection 24, and
body H, which, as stated, is part of the tubular 10 all major respects identical with that described
ment, the thrust seat A on the inwardly directed
?ange l6, engaging the outer face B of the radi
ally extending portion IQ of the thimble or sleeve
in connection with Fig. 1. It differs from that
that the sleeve or thimble is provided with a
radially extending portion which has a tapering
' annular surface 23, that is provided with a re
cess 24,. The ‘flare 25 of the conduit element It!
ll, moves it, together with the ?ared end 2| of
is conical and ?ts exactly into the recess. When
the conduit element I8, which is seated in the
so seated, the outer face of the flare is ?ush
recess l9’, and which flared end is thereby brought
into abutting connection with the projection [3 20 with the ‘outer face of the radially extending por
tion 19 of the thimble or sleeve H and presents
of the tubular conduit [0,.
a smooth and uninterrupted face for connection
InjFig. 1 it will be noted that the ‘free end
abutment with the cone projection of the tubu
of the ?are or outwardly extended radial por
lar conduit.
tion 2] of the conduit element which, as seen,
While I have illustrated and described 'what I
is in the shape of ‘a spherical concavity, extends
beyond the inner line of the bevel '2ll,'in which
the portion IQ of the thimble ill, terminates,
and that they exterior of the extended ‘portion
22 is parallel‘ with the longitudinal axis vof the
conduit Ill and its companionv element 18,. Simi
- now regard as the preferable embodiments of
my invention, the constructions are of course
subject to modi?cation, without departing from
the spirit and scope of my invention. I, therefore,
30 do not wish to restrict myself to the particular
larly, the corresponding concavity of the tubu
- forms of construction illustrated and described,
but desire to avail myself of all modi?cations
lar sleeve or thimble [1,‘ which receives the flare
that may fall within the scope of the appended
of. the conduit element :8, is. formed with an
internal annular'wall 23, between its concavity
and‘its bed/‘616d edge 2,6, and this internal an
nular wall 23 correspondswith the external, di
ameter oi the extended portion 22 andv provides
Having thus described my invention, what I
' claim and, desire to’ secure by Letters Patent is:
a perfect" metal to metal ?t and seal therebe
prising in combination withanv. internally thread
tween, which, is augmented by the‘, extended por
tion 22; which under pressure is forced out
wardly'the more intimately to engage‘ and aline
ed nut having at one. end thereof an inwardly
directed ?ange. a tubing associated 'with said
" conduit and‘havin'g, a. ?aring, end of greater di
with the internal annular wall 23, of. the thimble
ajmeter than the inside diameter of said‘ ?ange,
' A union connection, for a tubular conduit com
and an element on said tubing having; a ?ared
end corresponding, to the ?are of said, tubing,
conduit element i8, is ?tted ‘exactly. into the said ?aredend having; an annular recess in the
recess l9’ in the thimble portion l9, and. the
face thereof to receive. and seat the ?ared end
inner face conforms exactly'to. the contour of _ of said tubing flush with the. ?ared, end of said
Since the outside face of the ?are 2|v of the
element and form a seal against high pressure
the projection I3, on, the tubular conduit, the
connection pressure will insure a tight, leak
proof joint, without any dangerr or liability‘ of
when the ?ared, end, of, said: tubing is, moved-into
rupturing or otherwise injuring. the. ?are.
by said nut.
It,‘ will also beobserved that by this: construc
abutting engagementwith said tubular conduit
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