Note: Descriptions are shown in the official language in which they were submitted.
104~i3SI515
The present device relates to a connector for a rubber
hose.
In the accompanying drawings: -
Fig. 1 is a partial sectional view showing a convention-
al connector for a rubber hose~
Fig. 2 is a partial sectional view showing an embodiment
of a rubber hose connector of the present invention connected
to a compression coupling,
Fig. 3 is a sectional view showing a compression sleeve
for use in the compression coupling shown in Fig. 2,
Fig. 4 is an end view from the right hand side of
the compression sleeve shown in Fig. 3,
Fig. 5 is a partially sectioned view of an alternative
compression sleeve for use in the compression coupling shown in
Fig. 2,
Fig. 6 is an end view from the left-hand side of the
sleeve shown in Fig. 5 and
Fig. 7 is a sectional view showing a rubber hose -
assembled to a connector of the invention which in turn is
connected to a compression coupling. '`
A known connector for a rubber hose is shown in Fig. 1.
In this conventional connector, an inner tube 27 is formed inte-
grally with a tubular member 23 having a nut portion 25 extending
radially outwardly and axially dividing the outer circumferential
face of a tubular member 23 in two parts. A screw thread 29 `~
is formed on the part to the right of the nut portion 25 (as
viewed) and an annular groove 31 is formed onthe other part.
A conical outwardly flared seat 33 is formed at the end of the
inner surface of the tubular member 23 on the same side of the
nut portion25 as the annular groove 31. An outer tube 39 has a
screw thread 35 which is screwed onto the thread 29, the tube
39 defining together with the inner tube 27 an annular space 37 -
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for receivlng a hose. A coupling 49 comprises a conically taperéd
face 41 at one end thereof, which face 41 is in sealing contact
with the seat face 33 of the tubular member 23. A nut portion 43
divides the coupling 49 axially into two substantially equal parts
formed respectively with screw threads 45 and 47. A clamping nut
51 is thxeaded at one end onto the screw thread 45 and has at its
other end an inwardly extending flange 53 which engages in the
annular groove 31 to urge the conical surfaces into sealing con-
tact with one another.
The structure of the conventional hose connector is ~-
complicated and therefore expensive to manufacture. Furthermore,
` since the inner tube 27 is connected with the outer tube 39 by
means of screw threads, which can be stripped and slip on one
another with wear, the pressure resistance is inadeqùate.
In the conventional hose connector, since sealing is
effected by urging together tapered faces, should either of these
faces be damaged prior to assembling or should a foreign body be
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~- ~interposed between the faces, then seal:ing becomes difficult if `-
not impossible.
Finally, in the case of the described conventional `
- connector, it is desired to use the associated coupling with a
pipe instead of a hose then this is not possible and the complete
co~pling must be changed. Therefore, the adaptability of the
coupling used with a conventional connector is limited.
With a view to mitigating at least some of the foregoing
;.~ disadvantages, there is provided in accordance with the present
invention a connecting apparatus compr1sing a rubber hose
connector and a compression coupling wherein said rubber hose
connector comprising, a tubular member including an outwardly -
extending first flange for axially dividing an outer surface
thereof into a first face having same diameter over the whole
len~ and a second face, and an outer tube having an inner diameter
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larger than said first flange of said tubular member, said outer
tube member including a second flange having an inner diameter
slightly larger than said first face for engaging said first flange r
and for preventing axial movement in a longitudinal direction,
said second face of said tubular member and an inner circumferen- . :
tial face of said outer tube defining an annular hose-inserting
space therebetween for engaging said hose to be coupled by sliding ;'
said outer tube over said tubular member, and said compression r
coupling comprising, a coupling body having an inner diameter
slightly larger than said first face for encompassing an end of
said tubular member and for providing an annular groove adjacent Yi
said tubular member, sleeve member for encompassing and gripping ~ .
said tubular member, said sleeve member comprising an encompassing
portion for providing a clearance fit into said annular groove in :.
response to radial pressure, said gripping portion comprising at 1
least two first tubular member supporting sections having teeth
engageable with said cylindrical body member, said supporting
sections separated by notches and connected to said encompassing
portion by a thin section means for reduclng radial stiffness of
said gripping portion, packing means for providing a seal when
compressed in said annular groove between said body member and
said sleeve member, and a clamping nut for controllably providing ~
axial pressure f.or said encompassing portion of said sleeve member 1:
and for providing radial pressure for said gripping portion of
.. said sleeve member.
The invention will now be described further, by way.of r
example, with reference to Figs. 2 to 7 of the accompanying .`
drawings.
Referring now to Fig. 2, in order to provide an inner
tube 9, a radially outwardly extending flange 7 is formed on the
radially outer surface of a tubular member 1 and divides the outer
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surface of the tubular member 1 into a.,second section first desig- !
nated 3 and 5, respectively. The section 5 of the inner tube is
to be inserted into the end of the hose.
An outer tube 17 for surrounding the same end of the ¦ ~;
hose, is composed of a cylindrical portion 11 having an inner .
diameter larger than the outer diameter of the flange 7 and having
an annular flange 15 extending radially inwardly, the diameter l :
of the opening 13 in the flange 15 being smaller than the outer r
diameter of the flange 7 but greater than the outer diameter of
the tubular member 1. i :-
The outer tube 17 is slipped over the first section 3 of
the inner tube 9 until the flange 7 abuts the flange 15, and a ~ :
space 19 for receiving the end of the rubber hose is thus defined 1~ .
between the two tubes. '~ ..
An improved grip by the connector on the rubber hose can
be achieved by forming a plurality of annular tooth portions 55
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on the inner surface of the cylindrlcal portionll and a plurality
of arcuate grooves 57 on the outer surface of the section 5.
In general, the rubber hose connector having the above-
mentioned structure is used in combination with a compression
coupling 21 as shown in the drawings.
The compression coupling 21 will now be described in
detail.
The compression coupling 21 comprises a coupling body
67 of tubular cylindrical form having external screw threads
59 and 61 at its opposite end, separated by a nut portion 63
arranged substantiàlly at the axial center. An annular recess
65 is formed at the end of the inner hose of the body 67. A
clamping nut 71, having a radially inwardly extending flange 69,
engages the screw thread 61 on the same side of the nut portion 63
as the recess 65. A compression sleeve 73 is arranged radially
within the clamping nut 71 to grip the tubular member 1. An
elastic packing 81, such as an O-ring or a square section ring,
is arranged in an annular space 79 defined by the recess 65, an
end face 77 of an annular portion 75 projecting from the adjacent
end of the compression sleeve 73 and the outer surface of the
tubular member 1. The radially inner surface of the flange 69
is in the form of an inwardly flared conical face 83andwhen the
clamping nut 71 is tightenèd, the flange 69 co-operative with a
taperlngsurface of the sleeve 73 such as to compress the sleeve 73
in both a radial and an axial direction.
Referring to Figs. 3 and 4, in the compression sleeve 73,
a thin portion 89is produced by forming opposed first and second
annular grooves 85 and 87 on the outer and inner surfaces of the
sleeve respectively. A pipe gripping portion 91 extends axially
from the portion 89 of reduced thickness and, its outer surface
is conically tapered in a manner complementary to the conical face
83. On the inner surface of the pipe gripping portion 91, there
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are formed sharp teeth 97 defined by a plurality of continuous
annular grooves 95 of arcuate section. At least 3 slots 101
(4 slots are present in the embodiment shown in the Figs. 3 & 4)
are formed on the pipe gripping portion 91, the slots 101 extending
axially fromthe end face 99 of the sleeve 73 to the vicinity of
the portion 89 of reduced thickness. The annular portion 75
projecting from the left (as viewed) has an outer diameter a
little smaller than the inner diameter of the recess 65. When
the coupling body 67 and the clamping nut 71 are tightened
together, this annular portion 75 moves along the recess 65 toward
the left in Fig. 2 so as to compress the packing 81.
The compression sleeve 73 may alternatively have a
structure as shown in Figs. 5 and 6.
~eferring to Figs. 5 and 6, in the compression sleeve 73,
a portion 89 of reduced thickness is produced by forming an
annular groove 85 on the outer circumferential face at a position
adjacent to the axially projecting annular portion 75. A pipe
gripping portion 91 extends axially from this portion 89 and its
outer surface is tapered in a manner complementary to this taper
a second inclined face 93 coinciding with said face 83. On the
inner surface of the pipe gripping portion 91, there are formed
sharp teeth 97 defined by a plurality of continuous annular grooves
95 of arcuate section. Slots 101 (2 slots are present in the
embodiment shown in Figs. 5 & 6) are formed in the pipe gripping
portion 91, the slots 101 extending axially from the end face
99 to the vicinity of the portion 89 of reduced thickness. A
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circumferentially extending slot 103 connected to the slot 101
is formed in the portion 80 of reduced thickness. The annular
portion 75 has an outer diameter a little smaller than the inner
diameter of the recess 65. When the coupling body 67 and the -
clamping nut 71 are tightened, this annular portion 75 moves in
the recess 65 to thereby compress the packing 81. ~
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Fig. 7 illustrates the assembled state where the
connector is fitted to the end of a rubber hose 105 and is
connected to a compression coupling. The end of the rubber
hose 105 is sandwiched in the space 19, between the inner and -~
outer tubes of the connector and the outer tube is crimped -
to effect a tight grip.
By virtue of the above-mentioned structure, various
advantages such as set out below can be attained by the connector
of the invention.
Since the outer tube 17 is connected to the tubular
member 1 by abutment between the flange 7 with the flange 15
rather than screw threads, the pressure resistance is improved
considerably over the conventional connection shown in Fig. 1.
The structure of the hose connector as a whole is also signifi-
cantly simplified. -
Secondly, when the compression coupling 21 is used in
combination with the connector there is no longer a need to
take steps to ensure a good seal between mating conical surfaces,
thereby simplifying the process of connection should it be
required to replace the hose by a rigid pipe, the same compres-
sion coupling can be used without modification.
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