NZ233038A

NZ233038A - Two piece swaged end fitting for reinforced hose

Info

Publication number: NZ233038A
Application number: NZ233038A
Authority: NZ
Inventors: Colin James Taken; Frederick Russell Duffield
Original assignee: Duffield Ltd F
Priority date: 1989-03-21
Filing date: 1990-03-21
Publication date: 1992-09-25
Also published as: GB2229508A; GB2229508B; ZA902193B; GB9006353D0

Description

Priority Dat c» s>:.

Compete ?cEc-ivlc.>".icr; Fi; C:\r.zs: (•>)..Q1?.4*33. i&X... ?yhSkratten Date: P.O. JcMtna?, Nc: 1 t ■ r-fr^ r r -*i, , "?,•—/ ' • OL-OJ tnni B im. ' l(-o x 23 3 0 3 ^2 1 MAR1990v| X<-* ~ V// Patents form No 5 PATENTS ACT 1953 COMPLETE SPECIFICATION Number Dated HOSE END FITTING X/WE FREDERICK DUFFIELD PTY. LIMITED, a company incorporated under the laws of the State of New South Wales, of Beaumont Road, Mount Kuring-Gai, New South Wales 2080, Australia do hereby declare the invention for which jt/we pray that a Patent may be granted to xqe/us, and the method by which it is to be performed, to be particularly described in and by the following statement: ^ u J 8 This invention relates to a hose end fitting of a type which is intended to be swaged onto the end of a wire reinforced hose and, in particular, to an end fitting which may be used on differently sized hoses.

A hose end fitting which is intended to be used for this purpose is disclosed in Australian patent application number 14190/88, which dates from April 9 1987. Such end fitting comprises a more-or-less conventional stem member, which is intended to locate within the bore of a hose, and a 10 swage body which functions to clamp the hose end to the stem member when it is swaged onto the end of the hose. The swage body has an inwardly projecting circumferential flange forming a part of a nose portion of the member, and the stem member is formed with a groove for receiving the flange when 15 the swage body is swaged onto the hose end. The end fitting is characterised in that the swage body is formed about the nose portion with a circumferential land, and the groove in the stem member has a longitudinal length which is greater than that of the nose portion of the swage body. 20 During assembly of the swage body to the stem member, the swage body is firstly swaged inwardly such that the flange locates within the groove and, at the same time, the major portion of the flange body is forced into contact with the hose. Thereafter, with application of a further swaging 25 force, the swage body is swaged into more positive engagement with the hose and, at the same time, the circumferential land is displaced into the main body of metal forming the nose portion of the swage body. This displacement of metal results in a reduction of the force 30 that would otherwise be transmitted through the swage body to the stem member and which would have a deforming influence on the stem member. When the end fitting is applied to a thin-walled hose, a further swaging force is applied to the swage body and the major portion of the swage 35 body is forced into contact with the hose. At the same 7692S/SMCL '^3 a mm time, the metal forming the nose portion of the swage body is caused to flow in a longitudinal direction, so as to completely fill the groove, and the swage body is thereby reduced in diameter without having any significant deforming 5 influence on the stem member.

A problem which has been encountered with the above described (prior art) hose end fitting is that the relationship between the nose portion of the swage member and the groove in the stem member is extremely critical, and 10 the present invention is directed to an end fitting which provides for greater tolerance in the interfitting relationship of the two fitting components^" Thus, the present invention provides a hose end fitting which comprises a metal stem member which is 15 intended to locate within the bore of a hose and a metal swage body which is intended to locate coaxially about the hose wall and to clamp the hose end onto the stem member under the influence of a swaging force. The swage body has an inwardly projecting circumferential flange forming a part 20 of a nose portion at one end of the body and the stem member is formed with a groove for receiving the flange when the swage body is swaged onto the hose end. The groove within the stem member is located between first and second shoulders, the first of which is engageable in abutting 25 relationship by an external end face of the swage body flange and the second of which has a cammed surface which is engageable by a ramped internal surface of the swage body flange.

The end fitting is designed for use with at least two 30 differently sized hoses having similar internal diameters but different wall thicknesses. Thus, the end fitting requires two different amounts of body reduction to effect clamping of the differently sized hoses between the stem member and the swage body.

When assembling the end fitting to a larger diameter it k (N 11 C** |30^/99of 7692S/SMCL V?. / ' '' 0 C hose, the swage body is swaged inwardly such that the flange extends part-way only into the groove, locating positively between the two shoulders of the groove, and such that a major portion of the swage body is forced into locking 5 contact with the hose wall. Thus, the hose end is clamped between the stem member and the swage body, and the swage body is mechanically locked to the stem member.

If the fitting is to be secured to a smaller diameter hose, the swage body is swaged further inwardly until it 10 enters the groove wholly and the major portion of the hose body is forced into locking engagement with the hose wall. This further swaging is accomodated by engagement between the cammed surface of the second shoulder and the ramped internal surface of the swage body flange. The flange is 15 driven into the groove and the second shoulder is deflected to accommodate the deeper penetration of the flange.

Of course, the fitting is usable with any number of differently sized hoses provided that they have a common bore size and the outer covering of the hose is reduced in 20 diameter to a size which can be accommodated by the swage body.

The invention will be more fully understood from the following description of a preferred embodiment of a hose end fitting which is suitable for use with hoses having 25 different wall thickness. The description is given with reference to the accompaying drawings in which: Figure 1 shows a half-sectional elevation view of a prior art hose end fitting in the course of being assembled to a hose end; Figure 2 shows an elevation view of a stem member portion of the hose fitting in accordance with the preferred embodiment of the present invention; Figure 3 shows a half-sectional elevation view of a swage body which is intended to be fitted to the stem member 35 as shown in Figure 2; and // ft 3 Q Mad ;con 7692S/SMCL I> • ; < O Figures 4 and 5 show the stem member and swage body of Figures 2 and 3 during first and second stages of assembly of the swage body to the stem member.

As illustrated in Figure 1, the prior art end fitting 5 comprises a stem member 10 which is intended to locate within the bore of a hose (not shown) and which itself has a central through bore 11. The stem member is formed at its forward end 12 with a male or female connector portion (not shown) and at its trailing end with a stem portion or tail 10 13. The stem portion 13 is formed along a major portion of its length with barbs 14 which in use grip the bore of the hose. A shoulder 15 is formed ahead of the'stem portion 13 and the shoulder separates the stem portion from a circumferential groove 16.

A swage body or ferrule 17 is employed to clamp the end of the hose to the stem member 10, and the swage body 17 may be regarded as being composed of three integral longitudinally spaced portions, a nose portion 18 which functions to anchor the swage body to the stem member 10, a 20 diametrically larger hose clamping portion 19 which functions to surround the hose and clamp the hose into the stem member and an intermediate portion 20 which interconnects the nose and hose clamping portions. The hose clamping portion 19 of the swage body is formed internally 25 with circumferential barbs which, when the swage body is fully assembled to the stem member, penetrate the outer casing of the hose and deform the hose reinforcement to effect a positive locking engagement. The trailing end of the swage body 17 is formed with a small land or nib 21 30 which penetrates the outer casing of the hose and provides a weather seal against ingress of any moisture.

During assembly of the end fitting to a larger diameter hose, the swage body 17 is swaged inwardly to the position shown in Figure 1. That is, the hose clamping 35 portion 19 of the swage body is driven into positive ^ ' - • * i 7692S/SMCL ;\ 3 0 MAR f99Q */} V:\-. f?/ engagement with the outer covering of the hose and the nose portion 18 is driven into positive locking engagement in the groove 16. However, a small gap 22 is left between the end of the nose portion of the swage body and the stem member, 5 and a surrounding land 23 of the swage body is only partially deformed into the nose portion of the swage body.

When the end fitting is to be applied to a smaller diameter hose end, the swage body 17 is swaged inwardly to a greater extent from that shown in Figure 1 and, in the 10 process, the metal forming the nose end 18 of the swage body is caused to flow and fully occupy all of the groove 16.

That is, the gap 22 is filled with metal and, at the same time, the surrounding land 23 is totally deformed into the bulk of metal which forms the nose portion of the swage body. 15 The process of attaching the end fitting which is shown in Figure 1 to a hose end is very critical, requiring close registration of the interlocking parts of the hose fitting components. The present invention is directed to an arrangement which reduces the criticality of this 20 operation. Thus, the end fitting which embodies the present invention and which is illustrated in Figures 2 to 5 is, in some respects, similar to the prior art fitting but it incorporates features which avoid the above mentioned difficulty.

The fitting shown in Figures 2 to 5 comprises a stem member 30 and a swage body 31. The stem member 3 0 has a through bore 32, and a tail or stem portion 33 which is formed along a major portion of its length with external barbs 34. A circumferential groove 35 is located ahead of 30 the stem portion 33, the groove being defined by first and second shoulders 36 and 37. A coupling nut 38 is connected to the forward or left-hand end of the stem member 30, although this could be replaced by a male coupling component.

The swage body 31 has three notionally separate 35 portions, a nose portion 39 having an inwardly directed .... "V,i ~ * cA ! :o 7692S/SMCL ° & MAR /JJQ ''J. flange 40, a hose clamping portion 41 which incorporates a series of inwardly directed barbs 42 and a nib 43, and an intermediate portion 44 which joins the nose portion 39 to the hose clamping portion 41.

A number of important features are to be noted in respect of the end fitting which is illustrated in Figures 2 to 5.

Firstly, it is to be observed that the root diameter of the groove 35 in the stem member is significantly greater 10 than the diameter of the stem portion 33. Secondly, the shoulder 37 has a diameter which is significantly greater than that of the groove 35, and the shoulder has an outer periphery which is radiused as viewed in side elevation.

That is, the second shoulder 37 has a cammed functional 15 surface.

Further to be noted is that the first shoulder 36 of the stem member has an outside diameter which is equal to or greater than that of the second shoulder 37, and the groove defining wall of the first shoulder 36 is a substantially 20 flat wall which is intended to provide an abutment surface 45 for an end face 46 of the swage body.

Of further importance is the fact that the inner diameter of the flange 40 has a longitudinal length approximately equal to the width of the groove 35. 25 Moreover, an inner wall 47 of the flange 40 is inclined at an angle 0 (i.e. a ramp angle) of between 10° and 45° and preferably of approximately 30°, this providing a ramped internal surface for the swage body flange.

When assembling the end fitting of Figures 2 and 3 to 30 a thick-walled hose 50 (shown in dotted outline in Figure 4), the hose end is first pushed or screwed into the swage body 31 and the stem member 30 is then pushed into the bore of the hose. Thereafter, the end fitting is located within a swaging press (not shown) and the swage body 31 is swaged 35 inwardly to the condition shown in Figure 4. At this stage, S Q f J i 3°VARB9Q 7692S/SMCL a U the flange 40 is positively located within the groove 35, the barbs 42 have penetrated the outer casing of the hose and the total structure is locked together. However, it is to be noted that there is a gap between the root diameter of the groove 35 and the inside diameter of the flange 40.

When the end fitting is to be secured to a smaller diameter hose 51 (shown in dotted outline in Figure 5), the swage body 31 is swaged inwardly to a further extent, to the position shown in Figure 5 of the drawings. This further swaging operation is effective without causing the stem portion 30 to collapse under the swage body, and the further swaging is accommodated by driving the flange 40 of the swage body fully into the groove 35 in the stem member.

This further interengagement of the two fitting components is accommodated by using the ramped internal surface 47 of the swage body flange to drive the cammed surface of the second shoulder 37 in a manner such that it is deflected to the condition shown in Figure 5. w"' s A 233038 WHAT WE CLAIM IS: 1. A hose end fitting which comprises a metal stem member which is intended to locate in part within the bore 5 of the hose and a metal swage body which is intended to locate coaxially about the hose wall and to clamp the hose end onto the stem member under the influence of a swaging force; the swage body having an internally projecting circumferential flange forming a part of a nose portion at 10 one end of the body and the stem member being formed with a groove for receiving the flange when the swage body is swaged onto the hose end; the groove within the stem member being located between first and second shoulders, the first shoulder being positioned to be engaged in abutting 15 relationship with an external end face of the swage body flange when the swage body is swaged onto the hose end, and the second shoulder having a cammed surface which is engaged by a ramped internal surface of the swage body flange when the swage body is swaged onto the hose end. 20 2. The hose end fitting as claimed in Claim 1, wherein the cammed surface of the second shoulder is constituted by a peripheral portion of the shoulder which has a radiused cross-section. 3. The hose end fitting as claimed in Claim 1 or 25 Claim 2, wherein the stem member groove has a root diameter which is significantly greater than the diameter of a stem portion of the stem member, the stem portion itself being sized to locate within the bore of a hose to which the hose end fitting is intended to be fitted. 4. The hose end fitting as claimed in any one of

Claims

Claims 1-3, wherein the second shoulder has a diameter which is significantly greater than the root diameter of the groove. 5. The hose end fitting as claimed in any one of 35 Claims 1-4, wherein the first shoulder of the stem member has an outside diameter which is at least equal to the outside diameter of the second shoulder. 7692S/SMCL - 10 - 733038 6. The hose end fitting as claimed in any one of Claims 1-4, wherein the first shoulder of the stem member has an outside diameter which is greater than the outside diameter of the second shoulder, and the circumferential flange of the swage body has an internal diameter prior to application of a swaging force, which is larger than the outside diameter of the second shoulder and smaller than the outside diameter of the first shoulder. 7. The hose end fitting as claimed in Claim 6, —• wherein the internal diameter of the circumferential flange of the swage body has a longitudinal length approximately 10 equal to the width of the stem member groove between the first and second shoulders. 8. The hose end fitting as claimed in any one of Claims 1-7 wherein the ramped internal surface of the swage body which engages the cammed surface of the stem member has 15 a ramp angle of approximately 30°. 9. The hose end fitting as claimed in any one of the preceding claims wherein the swage body has three notionally separate portions, a first of which is constituted by the nose portion, a second of which is 20 constituted by a hose clamping portion which incorporates a series of inwardly directed barbs and the third of which comprises an intermediate portion which joins the nose portion to the hose clamping portion. 10. The hose end fitting as claimed in Claim 9, 25 wherein the intermediate portion of.the swage body has a wall thickness which is smaller than the wall thickness of the nose portion and smaller than the average wall thickness of the hose clamping portion. 11. The hose end fitting substantially as shown in 30 Figs. 2-5 of the accompanying drawings and substantially as hereinbefore described with reference thereto. 35 V/:s;>w A • JHZ - 4