Note: Descriptions are shown in the official language in which they were submitted.
FITTING ~SSEMBLY FUR REINFORCED ~OSE
BACRGROUND OF THE INVENTION
_ _ _
Field of the Invention
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The invention relates to hose assemblies, and,
more particularly, to an assembly for coupling a hose
to a fittin~ in a fluid tight manner.
DESCRIPTION OF THE PRIOR ART
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Numerous hose and fitting assemblies are disclosed
in the prior art. These assemblies are used to provide a
fluid tight seal between a hose and a fitting. Where the
hose fitting assembly is of the swivel or elbow type,
such sealing relationship may be destroyed if the nipple
is rotated relative to the hose after assembly.
Certain prior art fittings use threaded nipples in-
serted into a hose where oil can flow along the spiral
threads of the nipple and out of the fittings. For example,
in U.S. Patent No. 476,752 to Lenty, oil can flow from
hose 17a through the grooves 19 since no seal is provided
between the hose and the grooved end of nipple 20. In U.S.
Patent No. 1,006,671 to Myer, the nipple 7 has a spiral 16
and oil can flow out of hose 15 about the spiral. In U.S.
Patent No. 1,233,401 to Reeve, annular ridges on nipple b
are rounded and rest in ridges g~ ~hey do not create an
effective seal since they do not bite or dig into the hose
and must be seated properly to seal at all.
U.S. Patent No. 1,089,650-to Rile shows a nipple
having serrations or teeth 9 bu-t there are no teeth on
the sleeve wall so that leakage can take place between
the outer surface of the hose and the inner wall of fitting
19 .
U.S. Patent No. 1,486,421 to Dyer shows corrugations
27 on core 12 which are forced into hose 10 but a substan-
tial leakage path is formed about these corrugations.
--i_
~2~3
It is desirable to have a fitting with a singlenipple hose end which both seals and retains the nipple to
the socket and yet assigns these responsibilities to separate
design features.
SUMMARY OF THE INVENTION
It is an object of this invention to provide an
improved hose end fitting which i5 usable with known hose
and sockets.
It is a further object of this invention to provide
a sealed fitting for stainless steel braided hose which has
improved sealing.
It is still further an object of this invention to
provide a fitting having a single nipple which provides
both the seal and the retention of the fitting to the socket '.
on the hose end using separate design features.
~ hese and other objects are preferably accomplished
by providing a fitting assembly for a hose comprising a
nipple having a plùrality of spaced separate annular
barbs theraon adapted to dig into the internal wall of a
hose and threads remote from said barbs for coupling the
nipple to a socket. A socket is provided which includes
internal threads for threading engagement to the threads
on said nipple and spaced internal annular teeth adapted to
bite or dig into the outer wall of a hose thereby crusing
and clamping a hose between the barbs and teeth and filling
the space between the nipple and socket adjacent the barbs
and teeth when the socket is threaded to said nipple. In
this manner, the socket is retained to the nipple separate
from the seal provided between the nipple, socket and
hose and oil cannot leak past the barbs and teeth.
BRIEF DESCRIPTION OF THE DRAWING
Fig. 1 is an exploded view of a fitting assembly in
accordance with the invention;
Fig. 2 is a view of the fitting of the assembly oE
Fig. 1 having a hose coupled thereto;
Fig. 3 is a partial cross-sectional view of the
final assembly of the assembly of Eig. 1 to a hose; and
Fig. 4 is a view similar to a portion of the view
of Fig. 1 showing a modification thereof.
DESCRIPTION OF THE PREFERRED E~BODIMENT
Referring now to Fig. 1 of the drawing, a sealed
fitting 10 for reinforced hose, such as stainless steel
braided hose, commonly referred to as a fitting assembly,
is shown in exploded view. This assembly is adapted for
use with reinforced hose, such as hose 10 in Fig. 2,
which hose generally comprises an inner fluid sealing
tube 41 of rubber or elastomeric or similar material and
an outer tubular reinforcement 42 of conventional wire
braided construction, such as stainless steel braid. The
fitting 10 includes a nipple construction 11 of generally
cylindrical construction, including an elongated
substantially cylindrical portion 12 terminating at an
enlarged end 13. The nipple 11 further comprises an
integral enlarged portion 14 having an outer diameter
greater than the outer diameter of cylindrical portion 12
with the same internal diameter. A shoulder 15 is
provided at the intersection of portions 12 and 14. An
annular recess 16 is provided on portion 14 for receiving
a connecting wire therein as will be discussed. External
threads 17 are provided on the exterior of portion 14 and
an enlarged nut 18 having hexagonal flats 19 thereon (See
Fig. 3) is integral with portion 14.
A coupling member 20 is coupled to nipple 11 and
includes hexagonal flats 21 (Fig. 3) on its outer surface
and an integral smooth walled terminal cylindrical
portion 22. ~ember 20 is internally threaded at threads
23 and includes an annular recess 24 on its inner smooth
wall 25 ~eceiving therein and in recess 16 an annular
connector wire 26 terminatlng out of opening 27 in member
(Fig. 2~ as is well known in the art for retaining
coupling member 20 to nipple 11. A tapered inner smooth
walled portion 28 extends from the inner smooth wall
portion 29 of nipple 11 to threads 23. In this manner,
coupling member 20 swivels or rotates ~ith respect to
nippLe 11 and can be coupled, via threads 23, to a
threaded connection.
Fitting 10 further includes a socket 30 having a
forward internally threaded section 31 including threads
32 for mating engagement with threads 17 of nipple 11.
The exterior surface of the forward internally threaded
section 31 forms a conventional hexagonal nut 33 (see
also Fig. 3) so that the socket 30 may be tightened
relatlve to nipple 11. The socket 30 further includes an
intermediate section 34 which, when the socket 30 is
threaded onto the nipple 11 as shown in Fig. 3, defines
an annular space 35 (See also Fig. 3) betwe~n the
exterior surface of the nipple 11, adjacent threads 17,
when assembled as in Fig. 3, and the internal surface of
section 34 of socke-t 30. Finally, socket 30 includes an
axially rearwardly decreasing diameter section 36 which
includes means 37 in the form of teeth 3~3, 39 and 43 for
digging into the outer tubular reinforcement of the hose
40 as will be discussed further. These teeth vary in
internal diameter so that teeth 38 are greater in
diameter than teeth 43. As seen in Figs. 1 and 3, these
teeth are preferably jagged.
As particularly contem~lated in the present
invention, nipple 11 includes independent sealing means
and retention means thereon. Referring again to Fig. 1,
retention means is provided on nipple 11 by threads 17
thereon which are adapted to threadably engage teet~ 32
on socket 30. Independent of such retention means, sealing
means on nipple 11 is provided by a pair of spaced barbs
44, 45 at the terminal end of cylindrical portion 12. These
barbs 44, 45 are frusto-conically shaped integral portions
5 of portion 12, barb 44 being spaced from barb 45, each barb
44, 45 having a shoulder 46, 47, respectively, forming a
sharp peripheral edge 48, 49, respectively. Barb 45 is
provided on the end 13 tapering to a front terminal edge 50.
As shown in Fig. 2, the fitting 10 is assembled to
hose 40 by first placing socket 30 over the end of the hose
so that the nipple 11 can be inserted into the forward end
of the hose 40. As seen in Fig. 2, end 13 of nipple 11
enters internally of hose 40 with hose 40 e~tending to
threads 17. Socket 30 can now be moved along hose 40 until
15 threads 32 engage threads 17. Rotation of socket 30 on
threads 17 secures the socket 30 to nipple 11. The final
assembled position of socket 30 is shown in Fig. 3.
As socket 30 is rotated, it crushes the hose 40
between barbs 44, 45 on nipple 11 and teeth 38, 39 and 43
on socket 30. The sharp edges of the barbs and teeth dig
into and crush the hose 40. The hose 40 fills the entire
space between the internal surface of socket 30 adjacent
teeth 38, 39 and 43 and the outer surface of nipple 11
adjacent barbs 44, 45 and within space 35 and the spacing
between the teeth and barbs. Since barbs 44, 45 and teeth
38, 39 and 43 are annular and, since the crushed hose 40
fills the entire spacing between the socket 30 and nipple
11, oil cannot flow past the barbs.
Instead of being comprised of inte~ral parts 11,
30 14, 18 as shown in Fig. 1, these parts may be independent
components as illustrated in Fig. 4 wherein like numerals
refer to like parts of the parts of Fig. 1. Thus, nipple
11 has at the end an annular recess 112 provided on nut
portion 140, which is a separable element formed of
35 threads 170 and nut 180. ~ like recess 113 is provided
on portion 112 (which is similar to portion 12 of Fig. 1
~ ~72~38
but extends through nut portion 140) for receiving a
wire 114 therein as is well known in the art. The
terminal end of wire 114 extends to hole 115 in nut 1~0
as shown. Portion 112' has an integral shoulder or flange
150 with an elbow 151 integral therewith and extending there-
from to portion 152 which is otherwise identical to
that portion of nut portion 1~ in Fig. 1. Thus, nut
portion 140 can rotate or swivel with respect to cylindrical
portion 112 and is particularly suited to certain applica-
tions. Portion 20 can also swivel or twist so that the hose
can be oriented any way desired.
It can be seen that I have disclosed a fitting
having a single nipple having thereon means for sealing
the nipple to a hose and means for retaining the nipple
to a socket, both means being independent of the other.
The nipple is held to the socket by mating threads and
crushing of the hose between the nipple and the teeth of
the socket. The seal is created by crushing the hose
between barbs carried by the nipple and teeth carried by
the socket.
The fitting herein has many advantages over known
prior art fittings. Since the seal is not part of the
retention means, it will not leak in the manner of such
devices. The dimensions of fitting 10 may of course vary
to accommodate hoses of differing sizes and may be made of
any suitable materials, such as aluminum, stainless steel,
etc. Since the hose is actually crushed between the
socket and nipple, it will not blow off in high pressure
applications. The socket and nipple can of course be dis-
assembled from the hose and reused on another hose, ifdesired.
