JPS6116874B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hose joint, in which the fitting is compressed by upsetting and the end of the hose is grasped between the fitting and the insert, so that the fitting can be inserted into the fitting. Hose fittings that secure a body within the end of a hose.

BACKGROUND OF THE INVENTION In hose couplings of the type described above, it is difficult to position the fitting and the insert precisely relative to each other and preferably at the end of the hose in the longitudinal direction of the hose before compressing the fitting by upsetting. is necessary. To this end, an inwardly extending annular rib and a lip are formed on the inner surface of the fitting, while a groove is provided on the insert to receive the lip of the fitting so that the hose can be inserted through the first end of the fitting and the insert can be inserted into the fitting. into the end of the hose and pressing the hose until the end surface of the hose abuts the annular rib and the lip at the second end of the fitting contacts a radial shoulder formed on one side of the groove of the insert. It has been proposed to securely secure the fitting and insert together by positioning the fitting and then upsetting the second end of the fitting to engage the lip and the groove.

With this configuration, the fitting is positioned longitudinally relative to the end face of the hose and relative to the insert before upsetting. However, because positioning requires contact between the lip of the fitting and the radial shoulder of the insert, the distance over which the second end of the fitting is upset is limited by the height of the radial shoulder of the insert. If the second end of the fitting is upset to a distance greater than the height of the radial shoulder, the insert will break at the radial shoulder. Designing the fitting for a particular hose wall construction and thickness prevents such insert failure. However, to avoid too much variation in fitting designs, it is desirable for a single fitting to fit more than one type of hose of the same nominal diameter. Additionally, it is desirable to use a common insert for as many types of hose as possible to avoid insert diversity.

OBJECTS OF THE INVENTION In view of the problems of the prior art described above, it is an object of the present invention to provide a hose coupling that is compatible with multiple types of hoses of the same nominal diameter size.

(Structure of the invention and its operation/effect) For this purpose, the present invention includes an insert insertable into the end of the hose and a fitting that can be radially upturned around the hose, the insert and the fitting. The hose fitting includes an annular groove on the insert and a radially inwardly extending lip member on the fitting that is spaced from the insert prior to upsetting, the fitting for gripping a hose between the fittings. A lip member on the fitting engages a groove on the insert during upsetting, and an annular crushable stop member extends radially inwardly on the fitting, with one radial surface of the stop member engaging the groove on the insert. a radially outwardly extending abutment surface for longitudinally positioning the fitting with respect to the insert, and a radially inwardly extending hose stop on the fitting, the hose stop being joined by a radial end surface of the hose. A hose fitting is provided in which the fitting is held in position prior to upsetting, and the receiving surface of the insert extends radially outwardly by a distance less than or equal to the radial distance over which the fitting is compressed by upsetting.

In the hose joint of the present invention having the above structure, the radial end surface of the hose is fixed by inserting the hose into the fitting and inserting the insert into the end of the hose and pressing them together before upsetting the fitting. A stop member that is crushable by contacting the hose stop of the fitting is brought into contact with the receiving surface of the insert. Thus, in this state the hose, fitting and insert are maintained in precise longitudinal position with respect to each other. When the fitting is subsequently compressed by upsetting and applying pressure, the stop member in contact with the receiving surface of the insert is crushed, and the lip member on the fitting engages with the annular groove of the insert, causing the fitting and the insert to be compressed. to securely secure them together and increase grip on the hose end. In addition, the receiving surface of the insert is designed to extend radially outward by a radial distance equal to or less than the amount by which the metal fittings are compressed during upsetting, so the metal fittings will not crush the receiving surface of the insert during the upsetting process. .

In this manner, in the hose joint of the present invention, the component is positioned via the crushable stop member of the fitting without contact between the lip member of the fitting and the groove of the insert before the upsetting process, and The height of the lip member and the annular groove can be selected to be sufficient to allow engagement between the two after upsetting. This eliminates the possibility of the lip member pressing against the bottom of the groove and crushing the insert during upsetting, and also eliminates the difficulties in designing and manufacturing joints that were increased by forming deep grooves. It is possible to reduce performance and cost. It is also possible to set the dimensions of the fittings according to the maximum outer diameter of several types of hoses with somewhat different outer diameters, and to form a joint using inserts of the same size. It is possible to adapt the fittings to the hose fittings, reducing the variety of hose fittings.

(Example) The present invention will now be explained in more detail with reference to the attached schematic drawings.

FIG. 1 shows a conventional hose coupling, in which an insert 1 is shown at one end having a portion 2 for fitting into the end of a hose 3. FIG. The part 2 has a number of peripheral serrations 4 to increase the grip between the insert and the hose bore. The other end of the insert as shown is provided with a capture nut 5, but it will be appreciated that a number of different finishes are possible.

The insert comprises an annular groove 6, one side of which is formed by a radial shoulder 7 and the other side formed by a radial surface 8 on one side of an annular flange 9.

The fitting 10 has an inner surface 11 with an inwardly extending annular rib 12, and the hose 3 is attached to a first end of the fitting.
The hose can be inserted until the radial end surface 13 of the hose joins the rib 12. The inner surface of the first end of the fitting includes a gripping member 14, thereby increasing the gripping of the fitting on the hose.

At the second end of the opposing fitting there is a lip 15 which extends inwardly into the groove 6 of the insert when the fitting is upset. Before upsetting, the relative longitudinal position of the fitting/insert and the hose is determined by the connection of the fitting, in particular of the end face 16 of the lip 15, with the radial shoulder 7, which is determined by the connection of the end face of the hose against the rib 12. maintained.

While the fitting is prevented from moving longitudinally relative to the hose and insert, the radial distance over which the fitting can be compressed inwardly by upsetting is limited to slightly less than the radial height of the shoulder 7. If you try to upset a larger amount, lip 15
will crush the insert. When a fitting is required to fit different hoses with different wall thicknesses or different constructions, different upsetting distances are required for one or more different hoses, and this upsetting distance is not standard. the radial height of the shoulder 7 of the standard insert.

The height of the shoulder 7 could of course be increased, but this would increase the overall size of the insert and add to the cost of the insert. This increase in cost is particularly undesirable when used with other fittings that do not require shoulder height, and manufacturing two types of inserts with only a change in shoulder height reduces the cost of the insert. Double. Additionally, some of the fittings that can be used with inserts such as those shown are upset to a distance approaching the outside distance of shoulder 7.
The increased height of the shoulder makes this fitting difficult to upset since it must be upset to a distance equal to or less than the outside diameter of the shoulder.

An increase in the inner diameter of the lip 15 may cause the lip to not properly join the groove 6, causing the hose to be prematurely removed from the operative connection.

Referring now to FIG. 2, there is shown an embodiment of the invention which utilizes the insert 1 shown in FIG. The fitting 17 includes a radially inwardly extending crushable stop member 18 sandwiched between the annular flange 9 of the insert forming a receiving or mating surface with the end face 13 of the hose as shown. Therefore, the fitting is positioned in the longitudinal direction by a stop member 18 which also serves as a hose stop. The end face 16a of the fitting no longer needs to be joined to a shoulder on the insert before upsetting, and the inside diameter of the lip 15a can exceed the maximum diameter of the shoulder 7, as shown in FIG.

The fitting is radially compressed and upset onto the end of the hose. During upsetting, stop member 1
8 joins part 2 of the insert, is crushed around its outer periphery as shown at 18a in FIG. The thickness of the stop member is selected so that it can be crushed in this manner without crushing the insert.

The fitting is particularly suitable for use with so-called thin cover hoses, in particular with one or two layers of wire reinforcement. For this type of hose, the fitting is provided on its inner surface with teeth 19, as shown in FIG. 3, which penetrate into the thin cover of the hose and join the wire reinforcement to firmly grip the hose. Although the outside diameters of single-layer or double-layer thin wire cover hoses are different for hoses of the same nominal bore size, a single fitting that fits both types of hose of one nominal size is conveniently upset as shown. It turns out it's possible.

When the outer diameter of the hose is smaller than the largest diameter hose that the fitting can accommodate, the fitting may undergo radial movement relative to the insert. To avoid this, the inner diameter of the collapsible stop member 18 is preferably approximately the outer inner diameter of the insert.

Depending on how the fittings shown in FIGS. 2 and 3 are manufactured, the radial height of the collapsible stop member 18 may require a somewhat cumbersome and time-consuming mechanical operation, and the cost of the fittings may be reduced. make it very large.

FIG. 4 shows another embodiment of the invention, in which a fitting 20 designed to avoid such time-consuming mechanical operations is shown in FIGS. 1 and 2. Shown with insert 1. The fitting includes an annular sleeve having an inner surface at a first end 21 for receiving the end of the hose 3, with a number of radially inwardly extending gripping members 22 spaced apart on the inner surface 23. A hose stop 24 is provided,
One side thereof is adapted to be joined to an end surface 13 of the hose 3.

The other end of the fitting has an inwardly extending annular lip 25 adapted to be upset into a groove 6 on the insert. The inner diameter 26 of the lip 25 is larger than the maximum diameter of the radial shoulder 7 of the groove.

A crushable stop member 27 is formed on the lip to align the lip 25 with the groove 26;
It extends radially inwardly from the lip a distance sufficient to abut the abutment surface formed by the radial shoulder 7 on the insert. The fitting is pressed against the insert by the hose end surface 13 that is connected to the hose stop 24, and the stop member 27 is pressed against the insert before upsetting.
and the receiving surface of the shoulder 7 is ensured.

During upsetting, as shown in FIG. 5, the stop member 27 deforms within the groove 6 without collapsing the hole in the insert or interfering with the engagement of the lip 25 into the groove.

Thus, a fitting and hose coupling is provided that can be manufactured economically and that can be sized to fit a large number of different hoses of the same caliber and that does not require special inserts. The fitting is particularly suitable for use in so-called thin cover hoses with one or two layers of wire reinforcement. Although the outside diameters of single-layer and double-layer thin wire cover hoses may differ for hoses of the same nominal diameter size, a single fitting that accommodates two types of hose of one nominal size can be conveniently installed as shown. It is fully machined and can withstand normal tests without any problems.

Although the stop member 27 is described and illustrated as being annular, the stop member may be circumferentially segmented to facilitate deformation during upsetting.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional side view of a conventional hose joint before upsetting, and FIG. 2 is a side view of a hose joint according to an embodiment of the present invention using the insert shown in FIG. 1 before upsetting. Side view showing the state partially in section, 3rd
The figure is a partially sectional side view showing the embodiment shown in Fig. 2 after upsetting, and Fig. 4 is a partially sectional side view showing another embodiment of the present invention using the insert shown in Fig. 1. ,
and FIG. 5 is a partially sectional side view showing the embodiment of FIG. 4 after upsetting. In the figure, 1... insert body, 3... hose, 6... annular groove, 7... radial shoulder, 9... annular flange,
13... (hose) end surface, 15a, 25... lip, 17, 20... metal fitting, 18, 27... stop member, 24... hose stop body.

Claims (1)

[Scope of Claims] 1. A hose coupling that includes an insert insertable into the end of a hose and a fitting that can be swaged radially around the hose, the hose being gripped between the insert and the fitting, Before swaging an annular groove on the insert, a lip member extending radially inwardly is provided on the fitting spaced from the insert, so that when the fitting is inserted, the lip member is an annular crushable stop member engaging the groove and extending radially inwardly on the fitting, one radial surface of the stop member mating with a radially outwardly extending abutment surface of the insert to stop the fitting; longitudinally positioned with respect to the insert, and a hose stop extending radially inwardly on the fitting, the hose stop being joined by a radial end surface of the hose to maintain the position prior to swaging. and the receiving surface of the insert extends radially outwardly by a distance less than or equal to a radial distance over which the fitting is compressed by swaging. 2. The hose coupling of claim 1, wherein the collapsible stop member comprises the hose stop. 3. The crushable stop member, prior to swaging, has an internal bore corresponding approximately to the outer surface of the insert adjacent to the receiving surface.
Hose joint according to item 1 or 2. 4. An annular groove on the insert is formed between two radial surfaces of different heights, the lower radial surface of which is adjacent to the part of the insert that can be inserted into the hose and which is connected to the lip on the fitting. The member has a diameter greater than the largest diameter of either of the faces of the groove, and the crushable stop member extends inwardly from the lip member of the fitting and passes over the smaller face of the groove. 2. A hose joint according to claim 1, having a height such that said lip member is aligned with said groove prior to swaging in contact with a larger surface of said hose joint.