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Патент USA US3036610

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May 29, 1962
F. G. FABIAN, JR., ETAL
3,036,601
TERMINAL EXTENSION FITTING
Filed Oct. 31, 1958
3 Sheets-Sheet 1
May 29, 1962
F. G. FABIAN, JR., ETAL
'
Filed Oct. 3l, 1958
3,036,601
TERMINAL EXTENSION FITTING
3 Sheets-Sheet 2
May 29, 1962
F. G. FABIAN, JR., ETAL
3,036,601
TERMINAL EXTENSION FITTING
Filed Oct. 31, 1958
3 Sheets-Sheet 3
F/G. 7
F76. 8
greg.
Fatent @fire
l
3,036,601
"un"
3,636,661
Patented May 29, i962
2
gas leakage, and means acting upon the resilient means to
TERMINAL EXTENSIGN FITTING
maintain sealing pressure at all times, both before and
Francis G. Fabian, Jr., and Robert N. Paterson, Bradford,
Pa., assignors to Dresser industries, Inc., Dallas, Tex., a
corporation of Delaware
Filed Unt. 3i, 195g, Ser. No. 770,989
8 Claims. (Cl. 13S-_89)
terminal exten-sion fitting is such that an extension pipe
may `be connected into it in duid-tight relationship with
This invention relates to pipe connection devices and
is more panticularly concerned with a fitting adapted for
use in extending existing pipe lines, such as the lines of a
gas distributing system.
after incorporation of the extension line.
It is a feature of the invention that the structure of the
out `the need of any additional sealing means and Without
the need for threaded engagement.
It is another feature of the invention that the terminal
extension fitting may be utilized to provide an extension
to the terminal pipe with which it is associated merely by
removing the closure and introducing the extension pipe
into the open end of the íitting, followed by tightening
In municipal gas distributing systems, it is necessary to
provide extensions on existing lines from time to time
of the means applying sealing pressure to the resilient
either to accommodate the gas requirements of a newly 15 sealing element or gasket.
built structure or to provide a new extension for an addi
Other objects and features of the invention will be
tional pipe line network to supply `a newly-developed area
readily apparent from the following detailed description
or an existing area into which the gas supply is to be
newly extended.
of illustrative embodiments taken with reference to the
accompanying drawings wherein,
When it is desired to connect an extension of this type
FIG. 1 is la diagrammatic view of a typical gas main
to an existing gas line it has heretofore been necessary
network
having terminal portions reserved for future
to shut down service over at least part of the existing line
extensions in connection with which the terminal exten~
and reduce gas pressure before opening 'the line to eiiect
sion fitting of the invention is adapted to be used;
the desired connection of the extension line. ln the case
FIG. ‘2 is a longitudinal sectional view of a terminal
of small diameter lines, such an extension may sometimes 25
extension
fitting embodying features of the present inven
be made without complete service interruption by per
tion and illustrating one manner of interconnection with
mitting the gas to escape freely during the time the new
extension is being incorporated. This practice, however,
an existing terminal pipe;
FIG. 2a is a similar view of a modified form of the
has many obvious disadvantages of a serious nature.
Firstly, it is inherently dangerous owing to the escape 30 terminal extension fitting shown in FIG. 2;
FIG. 3 is `a perspective view, partly broken away in
of large volumes of gas and it requires highly skilled
section,
of the fitting shown in FIG. 2;
and reliable labor because of the speed with which
FIG. 4 is a View similar to that of FIG. 2 showing the
the work must be accomplished to hold Ithe amount of
relative relationship of parts upon partial introduction of
gas escaping within some limits. However, this loperation
Áan extension pipe into the fitting;
necessarily lowers the pressure in the line even under the 35
FIG. 5 is an elevational view of one manner of align
most `favorable conditions. Consequently, even if this
ing the extension pipe and the fitting to begin the inter
operation does not cause service to be totally suspended,
connection of the pipe into the fitting;
the efficiency of the service is greatly reduced and the
FIG. 6 is a view similar to that of FIG. 5 but showing
danger of serious accident is ever present.
a later step in the connection operation;
It is an object of this invention to provide a terminal 40
FIG. 7 is an elevational View showing the completed
pipe extension ñtting which is adapted to be applied to
terminals of `an existing pipe system to permit rapid and
simple connection with newly added extensions to the
pipe netawork without necessitating the shutting down of
service or reducing pressure in the existing system and 45
while substantially avoiding the escape of gas from the
line during the coupling operation.
lt is another object of the invention to provide la termi
nal extension `fitting of the character indicated which in
sures complete and effective sealing of the pipe terminal
until it is desired to connect an extension yet which is
readily accessible when required and permits the coupling
of an extension with minimum effort and without the
installation;
FIG. 8 is an elevational view similar to FIG. 5 showing
rthe manner of handling the extension pipe if longitudinal
movement of the pipe is not feasible;
FIG. 9 is similar to FIG. 8 `but shows a further step in
the interconnection of the extension pipe ofl FIG. 8 with
the terminal extension fitting;
FIG. l() is also similar to FIG. 8 showing .a still further
step in the coupling operation; and
FIG. ll is an elevational view of the completed instal
lation.
Referring to the drawings, `and more particularly to
FIGS. 2_4, the :terminal extension ñtting l5 illustrated by
need for skilled labor.
It is a further object of the invention to provide a 55 way of example, to show a typical embodiment of the
invention, has a main body 20 which is open at both ends
terminal extension fitting which lends itself to rapid and
and has a first end 22 which is adapted for interconnec
simple introduction of an extension line without special
tion with an existing terminal pipe indicated at 24, as by
tools and without the necessity of threaded interconnec
welding, the end 22 suitably having substantially the same
tion of the extension line into the existing line.
internal and external diameter as the terminal pipe. The
In ‘accordance with the invention, the terminal ex 60
second end 25 of the body 2t) has an enlarged diameter
tension fitting comprises a body portion having an axial
and is internally threaded, as indicated `at 26, and is
bore and adapted to be connected at one end, as by weld
formed with a shoulder Z8 and a tapered mouth 30 de
ing, to the terminal end of the pipe line which is to be
fining a pipe receiving aperture and a gasket recess. Ex
reserved for future extension. The other end of the body
teriorly, the end 25 is formed with threads 35 spaced
portion is constructed to receive an internal sleeve carry~ 65 axially inwardly from the end edge of the end 25 and
ing a removable »barrier which is automatically displaced
leaving a cylindrical surface 36 of a diameter less than
upon introduction of the extension pipe, a removable
that of the threads 3S.
closure for the tit-ting end to provide positive sealing of
Cooperating with the end Z5 of body Ztl is a sleeve ¿i0
the end until the extension is to be connected, resilient
which is externally threaded as shown at 42 for threaded
70
sealing means such as a gasket to cooperate with the
engagement with the threads 26 and which has a flange
closure and with Ithe sleeve to seal these members against
portion 44 adapted to abut against the shoulder 23 when
E
40 has an axial bore 46 dimensioned to receive the ex
the terminal extension fitting l5 is adapted to receive and
the body portion 82 is thus adapted to be received in the
tension pipe 4S with a free fit but without excessive
sleeve 4@ with a free fit.
the sleeve is fully inserted into the body Ztl. The sleeve
clearance, the sleeve bore being advantageously formed
to receive an extension pipe of the same diameter as the
terminal pipe 24 which, as previously indicated, cor
responds to the diameter of the end 22 of the body 2€?.
The axially inner end of the sleeve 40 is formed with a
cylindrical surface 50 which is adapted to receive, with
a slip-tit, the flange 52 of the barrier 54 which is adapted
to form a displaceable closure for the fitting end and
will be more fully described below.
Cooperating with the surfaces of the end 25 of body
20 and with the axially outer end of the sleeve 40, is a
gasket 60 of substantially right triangular cross-section
having an inner end or toe 62 adapted to engage the
axially-outer end of sleeve et) and the tapered surface of
the mouth 3@ of the end 25. As shown in FIG. 2, the
sleeve 40 advantageously has a tapered throat 64 to
As previously mentioned, the sleeve 40 carries a dis
placeable barrier S4 which is engaged with the sleeve 40
by means of a flange 52 which has at 52' an axially-ex
tending `tab suitably about Ms” long with a circumferen
tial width of about lé” which is secured, as by soldering
or spot welding, to the adjacent surface of the sleeve 40.
Interiorly, the barrier 54 has a rib 88 of substantially
right-triangular cross-section which is disposed on the
same diameter line containing the tab 52’ with the point
of greatest axial distance of the rib from the barrier 54 _
being displaced circumferentially 180° from the tab. A
flexible seal material indicated at 52", such as Thiokol
rubber, is used to seal the flange 52 with the sleeve 40‘.
The barrier 54 and the rib 88 are suitably formed from
a thin, e.g. .015 inch thick, sheet of metal, such as stain
less steel, so that the barrier 54 will be bendable and
accommodate the toe 62 of the gasket 66, the slope of 20 readily displaced when the extension pipe 48 is brought
to bear against it during interconnection of the extension
the throat 64 suitably corresponding to that of the
pipe with the terminal extension fitting of the invention,
mouth 38.
as will be described below. Suitably the barrier S4 is
The gasket 6l? is formed from rubber or rubber corn
provided
with a pin-hole aperture 89 to permit slight
position, this term being used generically to include
- natural and synthetic rubbers and other elastomeric corn 25 leakage of gas into the chamber enclosed by the closure
unit 8l and the barrier 54 in order to equalize pressures
pounds, or compositions having like properties and char
on both sides of the `barrier 54. As will be seen in FIG.
acteristic. The material is relatively firm and solid but
3, when the follower '70 is tightened upon the body Ztl,
sufficiently resilient and elastic to flow under pressure
pressure is applied to the gasket 68, which transmits seal
to conform to the surfaces between which it is confined.
ing pressure to the sleeve ¿itl and the closure unit 81 to
Since the fitting 2@ is particularly adapted for use in con
effectively seal the fitting against any escape of gas.
nection with gas-distributing installations, the gasket 60
When it is desired to introduce an extension pipe into
is advantageously formed from a rubber composition
the fitting in order to incorporate an extension line or
which is relatively resistant to attack by hydrocarbon
lines into the existing line with which the terminal ex
gases and oils. Examples of such resistant rubbery com
tension fitting is connected, it is merely necessary to re
positions which are suitable for use are neoprene (poly
move the follower 7d, the gasket 60, and the closure unit
choroprene) and butadiene acrylonitrile copolymers, such
8l
and to insert Ithe extension pipe through the follower
as those known commercially by the trade designations
and the gasket into the body 2li. By reason of the pres
Buna-N or GR-A. The invention is, however, not
limited to these specific materials, and when special resist 40 ence of lthe barrier 54, no substantial amount of gas
escapes during this operation and it is not necessary to
ance to gases is not required, any rubbery composition
shut down the line or to reduce the gas pressure. As the
having the above-specified characteristics may be ern
pipe is inserted into the body 2t) and the sleeve 40, it en
ployed.
gages the rib 88 and displaces the barrier 54, as shown in
Cooperating with the end 25 of body 2G is a follower
FIG. 4. By reason of the presence of trib 88, pressure is
’70 which is adapted to apply sealing pressure to the
first applied at one point to the barrier 54 and the barrier
gasket 6l?. The follower 7l? is internally threaded at 72
bends easily as it is gradually disengaged from the sleeve
for threaded engagement with the threads 35 and has
4G.
Suitably, the follower 70 is threaded loosely upon
a pipe aperture 74 corresponding in diameter substantially
the body 2G“ before the extension pipe 48 is positioned in
to that of the axial bore 46 of sleeve 40'. In order to
wardly sufficiently to engage the rib 88 and then, after
confine and protect the gasket 60 and to prevent frictional
the pipe 48 has been shoved further inwardly to displace
resistance by the gasket when the follower 70 is rotated
fully
the barrier 54 and, thus provide full fluid com
in tightening or loosening it with respect to the body 2t),
munication with the gas interiorly of `body 20, the fol
there is suitably provided a follower cup 76. In the em
lower 70 is then quickly tightened upon the body 20 to
bodiment shown in FIG. 2 wherein the parts are shown
apply sealing pressure to the gasket 6€) which then effec
in free relationship before the follower 70 has been
tively seals against the surface of the extension pipe 4S
tightened upon the body 20, the follower cup 76 takes
to complete the installation.
the form of an annular member conveniently stamped or
otherwise formed from a metal sheet to define a body
ln FIGS. 5 to l1 are illustrated diagramimatically typical
steps suitably employed in using the terminal extension
portion 78 formed with an aperture 79 sufficiently large
fitting of this invention to incorporate an extension line as
to receive the extension pipe 48 and a peripheral flange 60 described above. FIG. 5 shows Ithe relationship of parts
8€) which is dimensioned to be received on the cylindrical
as the extension pipe 48 is aligned with the fitting l5. A
surface 36 of the body 20.
mark 92 is `advantageously made on the pipe to indicate the
To provide a fully pressure-resistant closure for the
distance between the outer face of the follower nut 7 0 and
fitting and to prevent the entrance of dirt or other con
the inner end of the enlarged portion of the `body 20 so that,
taminants, the pipe 'aperture 74 is closed by a closure unit 65 when the mark 92 is just visible fbeyond the follower nut,
81 which has a cylindrical body portion 82 and an end
it will indicate that the pipe extension has been fully in-t
web 84 which extends beyond the body portion 82 to
serted and that complete communication with the gas in
define a peripheral flange 86 having a diameter greater
the existing line has been effected. As shown in FIG. 6,
than the diameter of pipe aperture 74 and advantage
the follower nut 7i) and the gasket 6i) are removed from
ously substantially equal to the internal diameter of the 70 the fitting 1S and mounted upon the end of extension pipe
end 22 of body 2t). As will be seen in FIG, 2, the flange
43 and the closure unit 8l is removed. The extension pipe
86 bears against the axially-outer wall of the gasket 60
48 with the follower nut and gasket are then partially
and is held in place by the follower 7l). The external
inserted in the fitting, the follower nut lightly tightened
diameter of the body portion 82 corresponds substantially
upon the body 2f), and the extension pipe is then fully in
to the external diameter of the‘extension pipe 48 which 75 serted into the fitting up to the mark 92. Upon tighten
E
et
3,036,601
ing of the follower nut 70, the installation is completed,
as shown in FIG. 7.
In the foregoing description, it will be understood that
the extension pipe is adapted to undergo limited axial
movement relatively to the fitting 15. If the extension pipe
should be so constructed that even this limited relative
axial movement is not possible, then the coupling of the
extension pipe into the fitting is suitably effected by the
system illustrated in FIGS. 8 to 11. In this system, the
free end of the extension pipe 48 is cut off to provide a
secondary pipe extension element 93, and this secondary
element is loosely connected to the remaining portion of
the extension pipe 48 by means of a compression coupling
Sie such as the well-known Dresser coupling of the type
illustrated, for example, in FIG. 15 of Pfefferle et al. U.S.
Patent No. 2,021,745, with the centering projection 6016i
6
aperture to prevent axially outward displacement of the
pipe 124 from the body 120. The opposite end of the
body 120 is generally similar to the corresponding end
of body 2Q of FIG. 2, with gasket 160, sleeve 140, barrier
154 and follower 170. The `closure unit 181 is also general
ly similar to closure member 81 except that it is suitably
a single cast member. Centrally, the body 1.2i)` is provided
with a radially inwardly-extending annular pipe stop
196 to keep the pipe 124 from extending too far into the
body 120.
In some cases, it is desirable to purge a line of air and
to equalize the pressure between a pressurized and an
unpressurized line. For this purpose, a purging opening
197 is provided and,. until it is ready to be used, it is
closed by a plug-v 198. When the extension fitting is
placed on the terminal end of a new section of a line it
removed. As will be seen in FIG. 8, the secondary ele
serves as a line cap until another new section is added.
ment 93 is fully inserted into coupling 94, with the follower
The purging construction is provided so that the air in the
95' loose, and the follower nut 7@ and gasket et? are then
new section con be vented. Furthermore, when a new
removed and mounted upon the pipe end and the closure
line is to be added to an old line provided with a terminal
unit 81 is then removed. The installation is then com
extension fitting as described above, the new pipe is ad
pleted as previously described in connection with FÉGS.
vanced into the fitting only a sufficient amount lto crack
5 to 7 with the follower 95 of the coupling 94 being also
the
barrier seal, thus allowing the pressure on both sides
tightened to complete sealing engagement with Athe second
of the barrier to equalize without producing a sudden shock
ary pipe extension element 93. Alternatively, as show in iv ci to the new system in the event Lthe pressures are not already
FiG. 10, the follower nut 7l) and gasket ofi may be first
equalized.
loosely mounted upon the body 2i) and the secondary ele
It will be understood, therefore, that all matter con
ment 93 then “stabbed” into the fitting 1S to the extent
tained in the foregoing description and in the drawings is to
indicated by the mark 92, and the follower nut 7d then suit
be interpreted as illustrative only and not as limitative lof
ably tightened upon the body 2i). It will be understood 30
the
invention and it will further be understood that, inso
that this procedure is also applicable to the systems shown
far as they are not mutually incompatible, the variou
in FlGS. 5 to 7,
features and details of construction of the several em-bodi
it will thus be seen that the only tool needed to effect
ments shown and described are interchangeable with one
the rapid and simple interconnection of an extension pipe
another.
,
line with the terminal extension fitting of this invention is
What we claim and desire to secure by Letters Patent is:
a wrench and it will similarly be seen that the connection
l. A terminal extension fitting adapted to be con
of the extension line may be effected rapidly with little
nected to an existing pipe line to permit rapid connection
loss of gas, without requiring the shut-down of the gas
with an extension pipe line, said fitting comprising a body
line or a reduction in gas pressure, and without requiring
portion having an axial bore, said body portion having a
the use of skilled labor. Thus, in a gas distribution sys 4-0
first end adapted to be connected to the terminal end of
tem as shown diagrammatically in FÍG. l, wherein a main
9%? has branch outlets 91 leading to existing consumers,
when terminal extension fittings of this invention are
the existing pipe line, and a second end, an internal sleeve
disposed in said second end of the body portion and a
removable barrier carried by said sleeve, said barrier being
applied to any terminal ends of the gas net-work as at A
adapted to be automatically displaced upon introduction
and at B, the coupling of a new extension into the existing 45
of the end of the extension pipe line and having means
net-work may be easily and rapidly effected.
on its axially-outer side extending axially-outwardly a
It will be understood that various changes and modi~
greater distance than the remainder of said barrier for
fications may be made in the embodiments of the inven
initial engagement of one circumferential portion only of
tion described above without departing from the scope of
said barrier by the extension pipe line, whereby to move
the invention as defined in the appended claims. For 50 initially only a portion of said barrier relatively to said
example, instead of having threads on the follower and on
sleeve, a removable closure for said second end to pro
the body of the fitting by means of which these elements
vide positive sealing of said second end, resilient sealing
art threadly engaged, other means for interconnecting the
means acting upon the removable closure and upon the
follower with the body of the fitting to apply sealing pres
sleeve to seal said closure and said sleeve against gas leak
sure to the gasket may be employed. Similarly, the closure
age, and means acting upon the resilient sealing means
unit 81, instead of being hollow as illustrated, may be in
to maintain sealing pressure upon said sealing means.
the form of a solid plug and may suitably be provided
2. A terminal extension fitting adapted to be connected
with a recess to receive a Spanner wrench or like tool to
to an existing pipe line to permit rapid connection with an
facilitate its removal from the body 20 when the con
extension pipe line, said fitting comprising a body portion
nection with the pipe extension is to be made.
60 having an axial bore, said body portion having a first end
A modified form of the terminal extension fitting is
adapted to be connected to the terminal end of the exist
shown, for example, in FIG. 2a wherein parts correspond
ing pipe line, and a second end, an internal sleeve
ing to those illustrated in FIG. 2 have been given like
threadedly engaged in said second end of the body por
reference numerals to which 1G() has been added. As
tion and a removable barrier carried by said sleeve, said
shown in this figure, the body 120, instead of having an 65 barrier being adapted to be automatically displaced upon
introduction of the end of the extension pipe line and
having means on its axially-outer side extending axially
outwardly a greater distance than the remainder of said
17h11 which threadedly engages the body 129. The pipe
barrier for initial engagement of one circumferential por
receiving aperture of the follower 170:1 has a tapered wall 70 tion only of said barrier by the extension pipe line, where
174g and the gasket has an axial extension 162’ which
by to move initially only a portion of said barrier rela
extends into the tapered pipe aperture and is provided
tively to said sleeve, a removable closure for said second
with a metallic spring helix or armor 160’ of the type
end to provide positive sealing of said second end, resilient
shown, for example, in Risley et al. U.S. Patent 2,610,078,
sealing means acting upon the removable closure and
which cooperates with the tapered surface of the pipe 75 upon the sleeve to seal said closure and said sleeve against
end 22 for welded connection to the pipe 124, has an end
122 suitably shaped to receive a sealing gasket 1690.
which is engaged by a follower cup 176g and a follower
anat-aser
7
gas leakage, and means acting upon the resilient sealing
means to maintain sealing pressure upon said sealing
means.
3. A terminal extension fitting adapted to be connected
to an existing pipe line to permit rapid connection with
an extension pipe line, said fitting comprising a body por
tion having an axial bore, said body portion having a first
end adapted to be connected to the terminal end of the
existing pipe line, and a second end, an internal sleeve
disposed in said second end of the body portion and a re
movable barrier carried by said sleeve, said barrier being
adapted to be automatically displaced upon introduction
of the end of the extension pipe line and having a tapered
rib on its axially outer side for initial engagement by the
extension pipe line, a removable closure for said second
end to provide positive sealing of said second end, re
silient sealing means acting upon the removable closure
and upon the sleeve to seal said closure and said sleeve
against gas leakage, and means acting upon the resilient
sealing means to maintain sealing pressure upon said seal
ing means.
4. A terminal extension fitting adapted to be connected
to an existing pipe line to permit rapid connection with
an extension pipe line, said fitting comprising a body por
tion having an axial bore, said body portion having a first
end adapted to be connected to the terminal end of the
S
of said second end to provide positive sealing of said
second end, resilient sealing means acting upon the re
movable closure and upon the sleeve to seal said closure
and said sleeve against gas leakage, said closure having
a body portion received by said sleeve and a peripheral
flange engageable with said sealing means, and means
threadedly engaged with said body portion of said fitting
and acting upon the resilient sealing means to maintain
sealing pressure upon said sealing means.
7. A terminal extension fitting adapted to be connected
to an existing pipe line to permit rapid connection with an
extension pipe line, said fitting comprising a body portion
having an axial bore, said body portion having a first end
of reduced diameter adapted to be connected to the termi
nal end .of the existing pipe line, and a second end of
greater diameter, an internal sleeve having external
threads threadedly engaging the wall of said bore in said
second end of the body portion, said sleeve having a flange
and said bore having a cooperating shoulder for limiting
insertion off said sleeve, and a removable barrier of thin
sheet metal carried by said sleeve, said barrier comprising
a web with a ñange engaged with said sleeve and being
adapted to be automatically displaced by bending upon
introduction of the end of the extension pipe line, a
removable closure disposed interiorly of said second end
to provide positive sealing of said second end, resilient
sealing means acting upon the removable closure and upon
the sleeve to seal said closure and said sleeve against gas
existing pipe line, and a second end, an internal sleeve
threadedly engaged in said second end of the body por
leakage, said closure having a body portion received by
tion and a removable barrier of thin sheet metal carried
said sleeve and a peripheral flange engageable with said
by said sleeve, said barrier being adapted to be automat 30 sealing
means, and follower means threadedly engaged
ically displaced upon introduction of the end of the ex
with
said
body portion of said fitting and acting upon the
tension pipe line and having a tapered rib on its axially
resilient
sealing
means to maintain sealing pressure upon
outer side for initial engagement by the extension pipe
said sealing means.
line, a removable closure for said second end to provide
8. A terminal extension fitting adapted to be connected
positive sealing of said second end, resilient sealing means
to an existing pipe line to permit rapid connection with an
acting upon the removable closure and upon the sleeve
extension pipe line, said fitting comprising a body portion
to seal said closure and said sleeve against gas leakage,
having an axial bore, said body portion having a first end
and means acting upon the resilinet sealing means to main
of reduced diameter adapted to be connected to the termi
tin sealing pressure upon said sealing means.
nal end of the existing pipe line, and a second end of
5. A terminal extension fitting adapted to be connected
greater diameter, an internal sleeve having external
to an existing pipe line to permit rapid connection with
threads threadedly engaging the wall of said bore in said
an extension pipe line, said fitting comprising a body por
second end of the body portion, said sleeve having a
tion having an axial bore, said body portion having a first
flange and said bore having a cooperating shoulder for
end adapted to be connected to the terminal end of the
limiting insertion of said sleeve, and a removable barrier
existing pipe line, and a second end, an internal sleeve 45 of thin sheet metal carried by said sleeve, sai-d barrier
threadedly engaged in said second end of the body por
comprising a web with a fiange engaged with said sleeve
tion and a removable barrier of thin sheet metal carried
and being adapted to be automatically displaced by bend
by said sleeve, said barrier being adapted to be automat
ing upon introduction of the end of the extension pipe
ically displaced by bending upon introduction of the end
line, a removable closure disposed interiorly of said second
of the extension pipe line and having a tapered rib on its
end to provide positive sealing of said second end, resilient
axially outer side for initial engagement by the extension
sealing means acting upon the removable closure and upon
pipe line, a removable closure disposed interiorly of said
the sleeve to seal said closure and said sleeve against gas
second end to provide positive sealing of said second end,
leakage, said slosure having a body portion received by
resilient sealing means acting upon the removable closure
said sleeve and a peripheral ñange engageable with said
and upon the sleeve to seal said closure and said sleeve 55 sealing means, and follower means threadedly engaged
against gas leakage, and means acting upon the resilient
with said body portion of said fitting and acting upon
sealing means to maintain sealing pressure upon said
the resilient sealing means to maintain sealing pressure
sealing means.
6. A terminal extension fitting adapted to be connected
to an existing pipe line to permit rapid connection with
an extension pipe line, said fitting comprising a body
portion having an axial bore, said body portion hav
ing a first end adapted to be connected to the terminal end
of the existing pipe line, and a second end, an internal
sleeve threadedly engaged in said second end of the body
upon said sealing means, said follower means being re
movable during insertion of said extension pipe line into
said body portion of said fitting and adapted to apply
sealing pressure upon said sealing means to provide fiuid
tight engagement with said extension line.
References Cited in the file of this patent
UNITED STATES PATENTS
portion and a removable barrier of thin sheet metal car
ried by said sleeve, said barrier being adapted to be auto
matically displaced by bending upon introduction of the
1,933,117
Markle _______________ __ Oct. 3, 1933
,389,553
Germany ______________ __ Feb, 4, 1924
end of the extension pipe line and having a tapered rib on
FOREIGN PATENTS
its axially outer side for initial engagement by the exten- .
sion pipe line, a removable closure disposed interiorly
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