NZ212378A - Tool for applying connector to high pressure hose - Google Patents

Description

212378 Patents Form No. 5 PATENTS ACT 1953 COMPLETE SPECIFICATION After Provisional No. 212378 dated 11 June 1985 "HYDRAULIC HOSE CONNECTOR" I, RICHARD STUART HUNTER of 103 Major Hornbrook Road, Christchurch, New Zealand, being a British subject and New Zealand citizen, hereby declare the invention for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement EN/-' i1t AUG I986 s> 212378 This invention relates to hose connectors and more particularly to a means for applying connectors to high pressure fluids, for example, hydraulic, air and water hoses.

At present, high pressure, hydraulic hoses are assembled using either a factory fitted, swaged end requiring a heavy press or alternatively a complicated, time consuming and expensive reusable fitting has been used.

The present methods suffer from inherent disadvantages as follows: (1) The factory swaged end cannot be reclaimed and reused when a hose fails. A new assembly is required each time. (2) The reusable fitting has a high cost and is difficult and expensive to fit while requiring great care in assembly or reassembly.

An object of the present invention is to provide a means for applying connectors to high pressure hoses which overcomes at least in part the abovementioned disadvantages and provides a system in which an end fitting can be removed quickly and reused to form a new assembly.

Further objects and advantages of the invention will become apparent from the following description which is given by way of example only.

According to the present invention there is provided a means for applying a connector to a high pressure hose, the | means including a compression tool and a pair of dies, each of ! I the dies having a semicircular recess therein, one of the dies having a tongue extending from alongside an edge of its .EN 7^$ semi-circular recess, the other of the dies having a groov6v 'if -20CT198 212378 extending from alongside an edge of its semicircular recess, the arrangement being such that, in use, with the dies mounted in the compression tool and with a ring slid over an end of a hose into which an end fitting is inserted with an insert stem within the end of the hose, the ring is compressed evenly by the dies in the compression tool, the dies as they are brought together bridge the recesses together so that the tongue slides into the groove to form a continuous compressing surface which compresses the ring onto the hose to firmly grip the inserted stem of the end fitting.

Further aspects of the invention which should be considered in all its novel aspects will become apparent from the following description which is given by way of example only.

An example of the invention will be described with reference to the drawings accompanying the provisional specification in which: Figure 1: shows a perspective view of a pair of compression dies of the type which have been used in the past to compress a ring onto a hose; Figure 2: shows a perspective view of a pair of dies usable in a compression tool according to the invention; Figure 3: shows a side view of a compression tool according to the invention shown in its closed position; and Figure 4: shows a view (on an enlarged scale) in the direction of arrows 3-3 of part of the compression tool witl^-^ ^ /Vs" O hydraulic hose positioned therein. ^ ' • In Figure 1 is shown a commonly available set of ji ' -20CT1987; existing compression dies usable in a press or the like " > compress a ring inserted on a hose. A disadvantage of such a 212378 set of dies is that the ring in certain situations had a tendency to blip out as shown in Figure 1 to the side as the parts of the die moved together. A degree of wastage inevitably occurs with the use of such dies.

The present invention can be used with any high pressure hose together with a range of the commonly used end fittings used as couplings, connectors and the like for high pressure hydraulic, air or water hoses. End fittings of the type referred to normally include an insert stem and a connector end formed form a metal or metal alloy material. The hoses used are, of course, any reinforced or strengthened plastics, rubber or the like high pressure hose of the type which are compressed onto the insert stem in a fluid tight manner.

In the example an end fitting 1 is shown which includes an insert stem 2 shaped and dimensioned to have a pair of compressed rings 3 and 4 fitted thereon to hold a hose 5 in position. The rings 3 and 4 are fitted to the fitting 1 by using a compression tool 6 (an example is shown in Figure 3). The compression tool 6 can be fixed to a bench or held in position on any work surface. The tool 6 having an operating handle 7 which is shown in Figure 3 in its lowered position (its raised position is shown dotted). In its raised position the mounts 8 and 9 for die parts 10 and 11 are spaced apart (as shown in Figure 4). The die parts 10 and 11 can be fixed to the mounts 8 and 9 by grub screws or the like so that they can be interchanged to suit the size of hose and/or fitting with which the tool 6 is being used.

Examples of a set of dies 10 and 11 are shown spaced 4 '■ V ^ t- I •».' ' 212378 apart in Figure 3. Each of the die parts 10 and 11 have a recess 12 which is semicircular in cross-section. A side edge of the die 10 has a tongue 13 extending at right angles to a longitudinal axis of the recess 12. The die part 11 has a groove 14 of a size, shape and position complementary to that of the tongue 13 in the die part 10 so that when the respective parts 10 and 11 are fitted to the tool 6 and it is in its closed or down position shown in Figure 2 a cylindrical recess is formed by the recesses 12.

In use to engage the end fitting 1 to the hose 5 the pair of rings 3 and 4 (as in Figure 4) are initially slid into position on the hose. The insert stem 2 is fitted fully into the hose. The respective parts shoiild ideally be free from oil and grease. An appropriate pair of dies 10 and 11 are fitted to the tool 6 ensuring that the grooved die 11 is lowermost in the tool.

With the handle 7 raised a first ring is located centrally in the die. The handle 7 is then lowered to close the die fully and this compresses the ring onto the outer hose cover to firmly grip the inserted stem of the end fitting. As the rings are compressed into the hose 6 the rings do not protrude and there are no projections to snag obstructions. Properly used the compression rings impart a pull-off strength at least as great as the tensile strength of the hose.

The advantages of the invention can be seen from a comparison between operation of the existing dies (shown in Figure 1) where blipping out occurs and the new dies (Figure 2). In the new dies the provision of the end 15 of the-latch 212378 tongue 13 and the corner 16 of the groove 14 which co-operate together as the dies are arcuately closed together prevents the ring from blipping out because the end 15 is engaged into the groove 14 to thereby prevent blipping out. in order to remove the end fitting it is possible to remove the rings without damaging the fitting. This is effected by replacing the upper die part 10 with a cutter die. The ring on the hose is centrally placed in the tool with the ring in the bottom die part 11. The handle 7 is 10 pulled down so that the cutter die shears the ring.

Thus by this invention there is provided a means for applying connectors to high pressure hoses.

A particular example of the invention is described by way of example and it is envisaged that improvements and 15 modifications can take place without departing from the scope of the appended claims. • •' t n r , . v 1 o V \> .20CIW® O

Claims (6)

&1Z378 WHAT I CLAIM IS:

1. A means for applying a connector to a high pressure hose, the means including a compression tool and a pair of dies, each of the dies having a semicircular recess therein, one of the dies having a tongue extending from alongside an edge of its semi-circular recess, the other of the dies having a groove extending from alongside an edge of its semicircular recess, the arrangement being such that, in use, with the dies mounted in the compression tool and with a ring slid over an end of a hose into which an end fitting is inserted with an insert stem within the end of the hose, the ring is compressed evenly by the dies in the compression tool, the dies as they are brought together bridge the recesses together so that the tongue slides into the groove to form a continuous compressing surface which compresses the ring onto the hose to firmly grip the inserted stem of the end fitting.

2. A means as claimed in claim 1 wherein the end fitting and ring are formed from a metal or metal alloy.

3. A means as claimed in claim 1 or claim 2 wherein the hose is any reinforced or strengthened plastics, natural or synthetic rubber and the like hose.

4. A means as claimed in any one of the preceding claims wherein the compression tool is fixed in position on a work bench or work surface.

5. A means as claimed in any one of the preceding claims wherein the compression tool has an operating handle, a set of mounts for the pair of dies, one of the mounts being movable arcuately by the operating handle to close the die^^jpHNliir^^by •v crimp the ring. 7 2.12378

6. A means for applying a connector to a high pressure hose substantially as hereinbefore described with reference to any one of Figures 2 to 4 of the drawing accompanying the provisional specification. RICHARD STUART HUNTER By His Attorneys BALDWIN, SON & CAREY