**•"*200135/ 201900 NEW ZEALAND PATENTS ACT, 1953 No.: 200135/201900 Date: 25 March 1982, 13 September 1982 COMPLETE SPECIFICATION "Improvements in or relating to Hose Fitting Assemblies" K/We, ENZED PRECISION PRODUCTS LIMITED, a Company duly \\ incorporated under the laws of New Zealand of 6 Bowden — *t<i ro*r, a i Road,, Pnkuranga; Auckland, New Zealand hereby declare the invention for which f / we pray that a patent may be granted to me/us, and the method by which it is to be performed, to be particularly described in and by the following statement: - 2001^ 201900 This invention relates to hose fitting assemblies.

It is an object of the present invention to provide a hose fitting assembly which will at least provide the public with a useful choice.

Accordingly the invention consists in a hose fitting assembly comprising a tail member sized to fit within the end section of a length of flexible hose, said tail member having a bore provided axially therethrough; and a ferrule constructed and arranged to, upon swaging, engage said end section of said flexible hose and clamp said end section against said tail member, said ferrule being axially located by said hose but not by said tail, said tail and said ferrule including, after swaging of the ferrule, co-operating ramp surfaces aligned at non-parallel angles to the axis of the assembly such that upon axial displacement of said hose with ferrule swaged thereon in a direction away from said assembly, the distance between said ramp surfaces is reduced, thus increasing the radial compression on said hose between said tail and said ferrule.

To those skilled in the art to which this invention relates, many changes in construction and widely differing embodiments and applications of the invention will suggest themselves without departing from the scope of the invention as defined in the appended claims. The disclosures and the descriptions herein are purely illustrative and are not intended to be in any sense limiting.

Two forms of the invention will now be described with reference to the accompanying drawings in.which: Figure 1 shows a part sectional view through a first embodiment of hose fitting assembly according to the invention; Figure 2 shows a cross sectional view through a second embodiment of hose end assembly according to the invention prior to swaging; and 200135 201900 Figure 3 shows a cross sectional view of the hose end assembly depicted in figure 2 after swaging.

Referring to the drawings, and more particularly to figure 1 according to the invention a hose fitting assembly 5 is provided comprising a tail member 6 which is engageable within the end section of a length of flexible hose 7, and a ferrule 8 which, upon swaging, compresses the end section of the flexible hose 7 against the outer surface of the tail 6 and is fixed to the hose 7, the construction and arrangement being such that upon axial displacement of the hose 7 with ferrule 8 swaged thereon, the radial compression of the hose 7 between tail 6 and ferrule 8 is increased.

As shown the tail member 6 comprises an elongate cylindrical member having a socket or fitting section 9 and a hose attachment section 10, the section 10 being sized and arranged to fit within the hose 7. A through-bore 11 is provided axially of the tail member 6.

As can be seen the outer surface of the attachment section 10 includes a plurality of projections generally indicated by reference numeral 12. It will be noted that each of the projections 12 includes a longer ramp surface 13, a shorter ramp surface 14 and a horizontal rib 15 which separates the ramp surfaces 13 and 14. In the embodiment depicte mger ramp surface 13 is aligned in a direction so as toforces imposed thereon by the hose 7 when under fluid loading and the ramp surface 13 is aligned at an angle of about 18° to the central axis of the tail member 6. The ramp surface 14 is 200135 201900 oppositely aligned to ramp surface 13 and is angled at about 47° to the central axis of the tail 6.

As can be seen from the drawing, the embodiment described includes two projections 12 spaced axially along the attachment section 10 of the tail member 6, but toward the forward end thereof. The remainder of the tail section 10 is comprised by a plane cylindrical section 16 which, upon swaging of the ferrule 8, intimately contacts the liner 17 defining the inner surface of hose 7 and thus provides a hydraulic seal between the hose 7 and the assembly 5.

As can be seen from the drawing the ferrule 8 is axially located only by the hose 7 and includes a plurality of depressions 18 therein which correspond substantially in number, shape and spacing to the projections 12 provided on the outer surface of the tail member 6. It will be appreciated that upon assembly the depressions 18 on the inner surface of the ferrule are positioned to coincide axially with the projections 12 on the tail. This aligning is assisted by the provision of ■co-operationg- means on the tail and ferrule which, in the i embodiment described, comprise an annular ring 19 provided on the forward end of the ferrule which, when the projections 12 are axially aligned with depressions 18, abuts on step 20 provided on the tail member 6.

The precise configuration of the socket section 9 of the tail member 6 depends largely on the application which the end assembly is to provide and it will be appreciated that various alternative configurations of socket or fitting section 9 may be 2001^5 201900 provided. The section 9 may for example be provided in male/female form to allow the provision of a quick release type coupling.

The embodiment depicted in figure 1 and described with reference thereto has been designed particularly for use with a wire reinforced hydraulic hose and the assembly is fitted by first removing a section of inner liner 17 from the pipe end and removing a section of the outer cover 21 also from the pipe end, so that the ferrule 8 bears directly on the wire reinforcing indicated by reference numeral 22. The tail member 6 and the ferrule 8 are then axially aligned with respect to one another and the ferrule is swaged using a commonly available swaging tool.

We believe the invention as embodied in the construction described with reference to figure 1, has a number of advantages, the most important being that as the ferrule 8 "floats" axially with respect to the tail 6, no point loading is created between ferrule 8 and tail member 6 under conditions of high fluid loading and indeed the co-operating projections 12 and depressions 18 ensure that the. higher the hydraulic loading the greater the seal between the pipe 7 and the assembly 5.

We have further found that the shallow angled projections 12 and depressions 18 generate a greater holding force on the reinforcing wires 22 and minimize point loading and thus stress on the reinforcing wire which are generally imparted thereto by steep angled projections. 6 -X- 200135 201900 The provision of shallow angle projections in combination with a "floating" ferrule 8, minimizes the number of projections required and accordingly manufacture is simplified and thus the cost thereof is reduced.

Referring now to figures 2 and 3 a further embodiment of hose fitting 30 is provided comprising a tail 31 sized to fit within the end of a length of hose or tube 32 and a ferrule 33 sized to fit about the hose or tube 32 and, upon swaging thereof, clamp the hose 32 against the tail 31.

As shown the ferrule 33 is provided with at least one and preferably a plurality of projections 34 on the exterior surface thereof, such that when the ferrule is placed within a swaging machine and swaged, the interior bore 35 therethrough is distorted into at least one and preferably a plurality of wave like projections 36.

In the form shown the bore 35 of the ferrule 33 is plain and cylindrical when in the under formed state and the projections 34 take the form of a plurality of circumferentially extending ribs which are preferably substantially equi-spaced along the ferrule.

The tail 31 includes a through bore 37 and has a plurality of peripheral projections 38 on the exterior surface thereof. In use the ferrule 33 is placed over the hose 32, the tail 31 inserted within the hose and then the two components are positioned so that the projections 34 on the ferrule 33 lie to either side of the projections 38 on the tail 31. Once positionsed the ferrule is swaged to crimp the wall of the hose 200135 2019 0( to the outside surface of the tail. As shown the ferrule and tail are configured so that when the front edge 39 of the ferrule abuts collar 40 on the tail/ the projections 34 on the ferrule are positioned correctly with respect to the projections 38 on the tail for swaging.

It will be noted in the embodiment depicted in figures 2 and 3, that once again the ferrule 33 is not directly connected to the tail 31 and thus when tension is applied to the hose 3 2 the crimped ferrule may "float" to some extent with respect to the end fitting 10-. It will be appreciated that as the ferrule 33 moves axially with respect to the end fitting 31 the hose 32 is clamped more tightly between the projections or adjacent surfaces of the two components.

In the form depicted the hose 32 is a rubberized hose provided with fabric reinforcement indicated by reference numeral 41 and, as shown, the hose end is preferably skived so that the inner lining of rubber is removed therefrom prior to attachment of the assembly 30.

It will thus be appreciated that the present invention provides a relatively simple yet effective form of hose fitting assembly which has the advantage that no direct stresses are generated between ferrule and tail and forces tending to remove hose from assembly increase the clamping action on the hose.

\SJt 3/