COLLIER A SURFACES MORDANTES EN FORME D'ARC POUR TUYAU SOUPLE

HOSE COLLET WITH ARCUATE GRIPPING SURFACES

Abrégé anglais

HOSE COLLET WITH ARCUATE GRIPPING SURFACES
A B S T R A C T
A hose collet makes up part of a hose coupling includ-
ing a tubular stem about which the hose is disposed. The collet
defines a plurality of ridges on the inner surface thereof dis-
posed generally parallel to the longitudinal axis of the collet,
the hose being engageable by the ridges defined by the collet.

Revendications

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A hose means coupling element for use with a tubular
stem and hose means disposed about a tubular stem, the hose
means being of the type having an inner elastomeric portion
and wire wrap disposed thereabout, said element comprising a
hollow, cylindrical collet defining a plurality of ridges on the
inner surface thereof disposed generally parallel to the
longitudinal axis of the collet and which is positionable about
a tubular stem, the ridges of the collet defining in cross-
section arcuate peaks facing toward hose means disposed about
the tubular system, wire wrap of the hose means disposed about
the tubular stem being engageable by the arcuate peaks of the
ridges defined by the collet.
2. The hose means coupling element of claim 1 and
comprising a tubular stem wherein the stem defines a plurality
of ridges on the outer surface thereof, hose means disposed
about said stem being engageable by the ridges defined by the
stem and engageable by the ridges defined by the collet.
3. The apparatus of claim 2 wherein the stem defines a
plurality of circular ridges therein positioned substantially
transverse to the longitudinal axis of the stem.

Description

This invention relates to hose couplings, and more
particularly to a hose coupling collet which has inner
ridges.
It is well known in hose couplings to provide an
inner tubular stem about which the hose is disposed,
and a hollow, cylindrical collet surrounding the hose.
Generally, the collet may be of the removable or non-
removable type, and it is known to provide the outer
surface of the stem with annular or circular ridges and
to also provide the inner surface of the collet with
annular or circular ridges, the ridges of the collet and
stem being transverse to the longitudinal axes of those
members, with the hose being gripped by such ridges between
the collet and stem. Examples of such systems are generally
shown in our U. S. Patent Nos. 3,589,752 and 3,699,625,
issued June 29, 1971 and Oct. 24, 1972, respectively.
The collets shown in these specifications, it will be
understood, re~uire machining in order to properly form the
annular ridges which run transverse of the longitudinal
axis of the collet.
Reference is also made to West German Patent
No. 1,172,619 of Nevne Argus G.m.b.H. and published June
18, 1964, wherein a hose appears to be held in place within
a collet by an annular ridge, generally similar to the
ridges disclosed in the above-cited specifications
U. S. Patent No. 3,142,502 issued July 28, 1964
to R. R. Luther discloses clamping sectors defining
circular pro;ections or ribs which become embedded in
the outer surface of the hose.
30 It is to be understood that while each of the

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colletS o~ clamping secto~ disclosed in the above-cited
speciflcations is e~fective in use, none of such elements
; lends itself to simple manufacture by, for example, extrusion.
Rather, lt appears that each of these elements must be
appropriately machined to properly define the circular ridges
thereon.
According to the present invention there is provided a
hose means coupling element for use with a tubular stem and hose
means disposed about a tubular stem, the hose means being of the
type having an inner elastomeric portion and wire wrap disposed
thereabout, said element comprising a hollow, cylindrical
collet defining a plurality of ridges on the inner surface
thereof disposed generally parallel to the longitudinal axis
of the collet and which is positionable about a tubular stem,
the ridges of the collet defining in cross-section arcuate
peaks facing toward hose means disposed about the tubular stem,
wire wrap of the hose means disposed about the tubular stem
being engageable by the arcuate peaks of the ridges defined
by the collet.
Thus the collet is capable of formation by extrusion,
whilst providing effective gripping of the hose without loss of
efficiency in operation thereof~
One example of a coupling according to the invention
will now be described with reference to the accompany
drawings, in which:-
Figure 1 is a sectional side elevation of the assembled
hose coupling in combination with an end of a wire-reinforced
hose;
Figure 2 is a sectional view taken along the line
II-II of Fig. 1.
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As shown in Fig. 1, a tubular stem 10 of conventional
design includes a head 12, a central body portion 14, an a
nipple portion 16 which can be inserted in the end of a
hydraulic hose 18 to which the coupling is to be attached.
The nipple portion 16 defines a series or plurality of circular ,
ridges 20 cut on the outer surface thereof, substantially
transverse o~ the longitudinal axis of the stem 10, to enchance
its ability to retain the hydraulic hose 18 received thereon.
As shown in ~ig. 1, the hose 18 is made up of an inner
elastomeric hose portion 22, intermediate wire wrap 24 disposed
about the inner elastomeric portion 22, and an outer elastomeric
portion 26 which defines the outer surface of the hose 18.
The wire wrap 24 is disposed at an angle skewed relative to the
longitudinal axis of the hose 18. Each of the ridges 20 in
turn defines in cross-section an arcuate portion 28 at the
peak thereof, and it will be seen that the inner elastomeric
portlon 22 of the hose 18 is engageable by the ridges 20
defined by the stem 10, with the arctuate portions~ 28 embedding
in the inner elastomeric portion 22.
The outer portion 26 of the hose 18 is cut and
shortened relative to the inner portion 22, to define an
end surface 30 thereof, so that a portion 32 of the wire
wrap 24 is not covered by the outer portion 26. A hollow,
cylindrical collet 34 is positionable about the tubular
stem 10 and hose portion disposed thereon. The collet 34
defines a plurality of ridges 36 on the inner surface thereof,
such ridges 36 being disposed substantially parallel to the
longitudinal axis of the collet 34. Each ridge 36 defined
by the collet 34 in turn defines in cross-section an

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arcuate portion 38 at the peak thereof (Fig. 2). The collet ~l~
is some~rhat oversize ln relation to the wire wrap 2l~ when initial-
ly ~itted thereon, and after the hose 18 is inserted on the stem
10, the collet 34 encompasses the hose 18 and is swaged there-
about so that the wire wrap portion 22 is en~aged by the ridges
36 defined by the collet 3ll wlth the end surface 40 of the
collet 34 abutting tne end surface 30 of the outer portion 26 of
the hose 18.
Because of the particular positioning and shaping of
the ridges 36 defined on the inner surface of tne collet 31~, i.e.
substantially parallel to the longitudinal axis of the collet 34
and havin~ peaks 38 of arcuate cross-section, with the wire wrap
34 being skewed relative to the longitudinal axis of the hose 18,
extremely effective holdlng of the hose 18 between the stem 10
L5 and collet 34 takes place, without separation of any of the in-
dividual ~Jires of the wire ~rap 2ll when the collet 34 is applied.
Such separatlon of individual wires has been a relatively common
problem in systems wherein the wire wrap is engaged by circular
rldges defined by the collet and which are positioned substantially
~b transverse to the longltudinal axis of the collet. Additionally,
it will be noted that the collet 34 which is the subject of ths
present invention lends itself to convenient ex~rusion thereof,
since the lnternal longitudinal rid~es 36 run substantially paral-
lel to the longltudinal axis of the collet 34 itsell.
'5 While a preferred embodiment of the invention
has herein been illustrated and described, this has been
done b~r way of illustration and not limitation, and the
invention should not be limited except as required by the
scope of the appended claims.
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