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Патент USA US2406488

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Aug. 27, 1946.
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,w, H, J, BROCK
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COUPLING DEViQE FOR PIPES 0R TUBES
Filed July 3, 1944
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‘2,406,483
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Patented Aug. 27, 1946
2,40%,488
{UNITED sTArE-s PATENT ‘OFFICE
2,406,488
‘COUPLING DEVICE FOR PIPES 0R_TUBES
‘William Hudson James Brock, _Leamington Spa,
IEngland, :ass'ignor' of one-half to Automotive
Products Company Limited, Leamington !Spa,
England
Application ‘July 3, 1944, Serial ‘No. 543,334
In Great Britain Jlily?, 1943
"5 ‘Claims. (Cl. 285-87.)
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"This invention relates ‘to coupling ‘devices for
pipes ‘or tubes, and'has for its object to ‘provide a
coupling which vremains"?uid-tight in the event
of high ‘?uid pressure being applied to the pipe
*or "tube, and in which'the pipe or tube is ?rmly
gripped against ‘longitudinal movement ‘in the
coupling.
In'aitube coupling ‘device incorporating a collar
comprising two annular portions, namely a’body
That-end of the collar remote from the ?ange
v‘can advantageously be arranged to ‘engage with
a ifrusto-conical pressure surface within the
‘housing, whereby said end part of the collar is
constricted into ?uid-tight engagement with the
tube when the housing is tightened, that part of
the collar engaging with the frusto-conical sur
face :of the housing preferably being Irusto-ooni
cal ‘also but having its surface inclined 'to ‘the
‘and a'?ange, the "latter ‘being carried at its outer 10 axis at asmaller angle't'han that of the saidlhous
‘part by one ‘end of the body and being initially
ingsur-face.
of "frusto-conical shape ‘with its inner edge slid
The :invention'is illustrated by way oiexample
able upon ‘the tube and vspaced from the ‘body
in :the accompanying drawing, in which:
‘portion of the collar by an internal circumferene
Figure ‘1 is a longitudinal sectional elevation
tial groove, said collar being disposed within an 15 ‘of a typical coupling, the parts‘ being looselyas
annular housing ‘arranged to compress the collar
.sembled;
‘
axially between a pair of internal pressure :sur
Figure 2 isla fragmentary sectional ‘elevation
.faces '“so as ‘to ?atten .the?ange and make its
to an enlarged scale, ‘primarily showing the col
.inner edge contract into gripping engagement
lar, the parts ‘being in their loosely assembled
with the tube, the present invention is charac 20
condition;
terised by .the vfact that'the collar and the cor
responding pressure surface. of the housing are
shaped so that as the housing is tightened the
said pressure surface comes into abutting en
,
,
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Figure 3 is a similar view showing the position ‘
of the parts when the coupling device is'tig‘htg
enediand
‘
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-
i
,
Figure 4 is a ‘fragmentary sectional elevation
gagement with the end of the collar body outside 25 .showinga modi?edconstruction of collar.
the ?ange, and thus arrests the v‘?attening ofbthe
'The coupling device shown .in Figure 1 is in
?ange at a stage before the internal groove be
tended for-connecting a tube ‘It to a pump (not
tween the ?ange and the body of ‘the :collar be
shown) or any other component of 'a ?uid pres
comes completely-closed.
,
vsure system, and comprises‘three parts, namely
Preferably ‘the said pressure surface of the 30 ‘.a terminal ?tting 'I I_, a union nut ‘l'2,>and a collar
housing engages with theend of the collar body, ‘
The terminal ?tting 'I'l has a body 14 screw
outside the ‘?ange, so as to :produce a ?uid-tight ‘ threaded externally ‘at I5 for engagement with
joint therewith.
,
the ,pump‘ or ‘equivalent component, a hexagonal
'There .is further provided {according to the in
?ange 16 beingprovided in the usual manner to
vention a tube coupling device incorporating a 35 enable it to be screwed into position. At its op
collar comprising two annular portions, namely
posite end the terminal ?tting H has an integral
a body and a ?ange, the latter being carried at
spigot 111 ‘formed with a ‘bore l8 adapted to re
its outer part by one end of the body and being
ceive slidably the endof ‘the tube l9. Externally
initially o'f frus‘to-conical shape with its inner
the spigot I1 is screw-threaded at 19 to ‘be ‘en
edge slidable upon .the tube andspaced from the 40 gaged by the thread 20 of the union nut I2, the
body portion of, the collar {byan internal circum
spigot l1 ‘and nut "[2 together forming a ‘housing
ferential groove, said vcollar being disposed with
which is capable of being tightened in an axial
in an annular "housing arranged to compress the
direction to clamp the collar 13. This tighten
collar ‘axially between apa'ir of internal pressure
ing action is, of course, secured by ,rotatingrthe
‘surfaces so as to ?atten 'th'e ?ange and make its 45 nut'lZ by meansof a spanner applied to the hex
_ inner edge contract into gripping engagement
agcnal?angeifl ofthenut.
'
'
~
with the tube,,characterised ‘by the ,fact that the
, The collar 53 is in the .form of an endless ring
‘collar is ‘formed outside the ?ange, with an axi
ally projecting rib which is arranged to be en
gaged ‘by ‘the ‘corresponding pressure surface of
the vhousing as ‘the latter is tightened, and arrests
th'e ?attening of the ?ange ‘before the internal
‘groove ‘between ‘the ?ange and the body of the
collar becomes completely closed.
of metal, which latter is usually harder than the
metal .of ‘the "tube Iii. Its initial ‘shape in radial
section is sho-wnr'clearly ‘in Figure 2, and it will'be
seen that the collar comprises two main but in
tegral portions, namely a body portion 22 oftrap
ezoidal or other quadrilateral shape and a ?ange
'23, which latter is initially frusto-conical. The
‘In the preferred construction of coupling de 55 internal surface 24 of the body portion and the
vice that pressure surface of the housing engag
corresponding surface 25 of the ?ange "23 are
ing the ?ange is in the form of a plane annulus;
initially a smooth, sliding ?t upon the outside of
‘however, if desired, that pressure surface of the
the ‘tube, "LIJ. A collar !3 is formed with an inter
housing engaging vthe ?ange may he stepped to
nal groove 26 of substantially V-shape in radial
form a pairof. concentric .zones, the inner zone 60 section, the; walls 421 and 28 being joined “by a
disposed adjacent'to‘th‘e inner edge of ‘the ?ange
being receded relative to the outer zone.
‘curved part '29 at the point of the'V. At'that part
outside the ?ange 23 ‘the body portion 22 of the
2,406,488
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collar I3 has an'axially directed'annular rib 30,
while the opposite end of the collar is tapered
ibutmay, alternatively, be a separate member 10-.
cated in an undercut recess in the collar, in which I y
externally to form a frusto-conical surface 3|. ..1 it is locked when ?attened. If the tube coupling
connected with the bore 24 by a curved‘edge _32.f
is being used with tubes of hard material, a groove
only co-operate at a localised region 34 adjacent
tube.
‘may be preformed in the tube to receive the lip
The union nut I2 also has a corresponding in
ternal frusto-conical surface 33,, which, however, * instead of being formed by the ?attening of the
is disposed at a greater inclination to the axis .7 lip. If the lip itself is to form the groove it is
than is the surface 3|, so that the two surfaces n 7 preferably formed of harder material than the
the rear end of the collar I3. It Will be seen that
the surface 35 of the spigot I'I facing the ?ange
23 is in the form of a plane annulus.
v
When the union nut I2 is tightened, its frusto
conical surface 33 is advanced towards the sur
face 35 of the spigot 11, and consequently the
body portion 22 of the collar I3 is vforced forwardly
until the rib 30 is pressed ?rmly against the sur
face 35 of the spigot ll.’ During this movement
the inner part of the surface 35 prevents the in
side edge of the ?ange 23 from moving forwards
and therefore said ?ange 23 becomes partially
?attened; owing to its initial frusto-conical shape
and the fact that the outer part of the ?ange 23
is supported by the relatively massive body por
tion 22, said ?ange 23 contracts inwards and‘ bites
into the tube ID, as indicated'at 36 in Figure 3. h
The provisionof the rib 30, however, causes this
?attening to be arrested at a stage before‘the
What I claim is:
1. In atube coupling device comprising anv
axially contractible housing to be slid over a pipe,
and an annular collar disposed within said hous
ing, said collar consisting of a body portion
formed with an integral frusto-conical ?ange,
which latter is ?attened by the tightening of the
housing and is thereby caused‘to contract into
biting engagement with the pipe, the provision of
means for limiting the ?attening of the frusto
conical ?ange, said limiting means comprising a
compression face on the housing, which face, at
a stage in the tightening before the said ?ange
becomes completely ?attened, is arranged to bear
‘directly against that part of the collar outside the
frusto-conical ?ange, thereby forming a ?uide '
tight axial compression seal between the said
compression face and the body portion of: the
collar, independently of the ?ange.
‘
walls 21 and 28 of the groove 25 come into contact
2. In a tube coupling device ‘comprising an 7
with one another, as it is found that this enables 30
axially contractible housing to he slid over a‘ pipe,
a ?uid-tight joint to be readily obtained at 31
and
an annular collar'disposed within said hous
between therelatively localised co-operating sur
ing, said collar consisting of a body portion '
faces of the rib 30 and the spigot [1. ‘The axial
formed with 'an integral frusto-conical ?ange,
pressure exerted by the union nutv I2 also causes
the relatively thin rear part 38 of the collar I3 35 which latter is spaced at its inner part from the
body portion by an internal circumferential
to be contracted by ‘the frusto-conicalsurfa'ce
33, thus producinga ‘?rm ?uid-tight gripat 39‘
between the collar I3 and the tube II]. This forms
groove and is ?attened by the tightening of the
‘housing so that‘it is caused to contract into bit
ing‘engagem'ent with the pipe, the‘p‘rovision' of
a double check against leakage of ?uid along the
inside of the collar I3; atth’e same time thegpres .40 means for limiting the ?attening of the frdsto
conical ?ange, said ‘limiting means comprisingea
sure exerted upon ‘the ?ange 23 by the spigot at
compression
face on the housing, which face, at
,45 produces a seal which augments the seal at 31.
a stage in the tightening before the said groove
The engagement of the collar I3 with the tube Ill
between the ?ange and the body portion becomes
at'39 steadies the collar upon the tube I0, thus
making the connection more robust. It will be .'~ completely closed, is arranged to bear directly
against that part of the collar outside the frusto
seen, moreover, that the radius of the circle of
conical ?ange, thereby forming a ?uid-tight axial
contact at 34 between the union nut I2an‘d the
compression seal between the said compression 7
collar I3 is lessthan the corresponding average
radius of the rib 30; therefore, when the union»_ face and the body portion of the collar, inde
nut I2 is turned, slip occurs more readily at 34 '
.than at 31, thus ensuring that the collarv I3 is
not rotated upon the pipe I 0.
In the modi?ed construction of collar I3 and
housing I2, I‘! shown in Figure 4 the collar I3
has a body portion 22a which is of substantially
rectangular cross-section and is of the same shape
as the collar described in my co-pending United
States application Serial No. 504,008, ?led on
September 29, 1943. .At its'forwardpart the col
lar I3 has an annular end surface 40 constitut
ing a smooth radial continuation of the outer sur
face 4| of the ?ange 23. In'or‘der to prevent the
?ange 23 from being completely ?attenedhhow
ever, thesurface 35a of the spigot I1 is formed
in two zones, namely an outer zone 42 and an
inner zone 43, the latter being receded relative to
the zone,42. Thus, as the coupling device reaches '
its fully'tightened state the surface 40 bears ?rm
1y against the zone 42, thereby producing a ?uid
tight joint around this part of the collar I3. As
the rear surface 44 of the collar I3 is plane, the
corresponding surface 33a of the nut I2 is shaped
similarly.
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pendently of the ?ange.
.
3. A tube coupling device according toclaim 2,
having at that part of the body portion of the
collar opposite to the frusto-conical ?ange, a
tapered frusto-conical part arranged to be en
gaged by a corresponding frusto-conical surface
within the housing, whereby axial tightening of
the housing causes the tapered frusto-conical
(part of the collar to be pressed inwards into ?rm
engagement with the exterior of the tube. ‘
4. A tube coupling device accordingto claim 2., '
having formed integrally withthe body portion of
the collar, an axially facing annular land which
surrounds the frusto-conical ‘?ange and cooper
ates with the said compression face of the hous
ing to limit the ?attening of said frusto-conlcal
?ange and form the said axial compression seal.
5. A tube coupling device according to claim 2,
having an axially directedannular land formed
upon the compression face of the housing and
arranged to engage with the body portion of the
collar at a position outside the frusto-conical
?ange and thus serve as the said limiting means.
,
, The lip is preferably integral with the collar.
HUDSON JAMES erggocx.v .
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