JPH0337076B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that the connecting portion is provided with a retaining rib projecting outwardly to the periphery thereof, and the front end of the retaining rib has a substantially conical shape and is directed toward the push-in end of the connecting portion; pushed through the terminal end of the hose, the clamp ring surrounds the push-in end of the hose in the region of the retaining rib, has a closed peripheral end at its axial end and extends in the axial direction of the clamp ring; , relates to a hose coupling with slots extending radially therethrough and uniformly distributed around its periphery.

In known hose fittings of this type, the rear side of the retaining rib remote from the push-in end of the connection part flares out in the radial direction. Each of the clamp rings has an annular projection projecting inward at the front and rear ends in the axial direction. Its front annular projection presses the end of the hose fitted into the connection against the conical side surface of the retaining rib. Further, the rear annular projection presses against the cylindrical surface of the connecting portion that is joined to the radial side surface of the holding rib. The slots of the clamp ring are axially shorter than the axial length of the retaining ribs, and the part of the web between the slots is relatively thick in its radial direction, with its thickness increasing on the inside towards the ends. Due to its short axial dimension, it is virtually inflexible in the radial direction and its holding force is considerably lower in the region of the holding ribs. This has an adverse effect on the sealing effect and the degree to which the hose is stabilized against attempts to pull the connection apart in the axial direction. In the region between the annular projection and the radial surface of the retaining rib, a hollow space may be formed between the cylindrical outer surface of the connection part and the hose without a gas-tight effect. Align the clamp ring with the hose before pushing the hose through the connection, then push the hose and clamp ring together through the connection and feed the hose. In order to facilitate pushing of the hose and clamp ring, at least the inner diameter of the radially inwardly projecting annular projection of the clamp ring must be substantially larger than the outer diameter of the retaining rib. Therefore, from the viewpoint of stabilizing the hose in the axial position and obtaining airtightness despite the hollow portion, if the hose is pressed between the front clamp ring and the cylindrical outer surface, The clamp ring will be too small. When the inner diameter of the front annular projection is reduced, a very extreme amount of force is required to force the hose into the connection.
In such a case, you will not be able to pull it off by hand.

The object of the invention is to provide a hose coupling of the above-mentioned type, which provides adequate sealing and axial stability, and which allows the hose and clamp ring to be easily pushed into the connection.

According to the invention, the slots of the clamping ring extend over the axial length of the rear side of the retaining rib remote from the push-in end of the connection, and between said slots the portion of the web is radially elastic. The retaining rib is flexible and has a substantially conical back surface, and before the hose and clamp ring are pushed into the connection, the average radius of the web portions is small and at least a small portion of them By making the length constant, the above problem is solved.

The fact that the retaining ribs remote from the push-in end of the connection part are of conical construction means that due to the long web part that is bent radially outwards in the area of the retaining ribs, the connection between the hose and the connection part is The arrangement of the invention is advantageous in that the hose is pressed firmly against the retaining rib and the connection part over a large part of its axial length by eliminating hollow parts or cavities and by creating a spring biasing effect of the web part. , producing good airtightness and axial fixing effect. Therefore, the inner diameter can be made relatively large. It becomes possible to completely eliminate the annular projection at the front end of the clamp ring. This serves to press the hose and the clamp ring together on the connection. In this case, long elastic web sections contribute to the pressing action of the hose against the connection, while they are biased or prestressed by springs in a relatively long axial region of the end of the hose. The clamp ring elastically bends in this region against the thermal expansion of the hose material.
Also, when the hose material shrinks due to cooling, it can be tightened again. This results in a further increase in the tightness that occurs.

Furthermore, it is also desirable for the retaining rib to include shallow teeth extending around the periphery of its back surface. In that case, the axial locking effect is further improved.

These teeth may have a sawtooth structure in axial cross-section, and the sides of these teeth may lie on a radial plane away from the push-in end of the connection. This sawtooth structure firstly facilitates the operation of pushing the hose into the connection part;
secondly, pulling out the hose from the connection part;
Or it has very strong resistance to coming off.

Preferably, the slot is provided over at least the entire axial length of the retaining rib.
With this structure, the web portion elastically presses the material of the hose against the retaining rib over the entire length of the retaining rib, resulting in a high degree of safety and reliability in terms of air-tightness and axial fixation. is obtained.

Further, the inclination angle of the rear surface of the retaining rib is smaller than the inclination angle of the front surface of the retaining rib, the lengths of both sides in the axial direction are approximately the same, and the outer diameter of the connecting portion at the pushing end and the It is further preferred that the retaining ribs adjacent to the hose have an inner diameter somewhat smaller than the inner diameter of the hose in the unstressed state. This makes it easier on the one hand to insert the connection into the hose and on the other hand to push the hose into the connection. Nevertheless, the bulk of the hose pushed into the connection, in particular its front end, exerts an inherent bias or prestress on the connection, thereby increasing the sealing effect.

In that case, the length of the clamp ring in the axial direction may be such that the end of the clamp ring that is remote from the push-in end of the hose is in front of the push-in end of the connection part. In this way, even when the hose is bent or displaced radially in front of the push-in end of the connection, the clamp ring prevents the hose material from separating from the conical front surface of the retaining rib. Do it like this.

One peripheral edge of the clamp ring may support a front surface of the push-in end of the hose. In this way, the peripheral edge forms a stop to prevent the clamp ring from being pushed too far into the hose.

The clamp ring may have a constant internal diameter before the hose and clamp ring are pushed into the connection over the length of the slot. This facilitates the manufacture of the clamping ring and allows the web portion to elastically bulge outward in the central axial region spanning the back of the retaining rib to provide the desired spring biasing effect on the hose. will give.

Furthermore, the peripheral edge of the clamp ring on the back surface of the holding rib may be corrugated in the peripheral direction. Furthermore, this means that the front end of the clamp ring is widened when viewed from the direction of fitting the clamp ring into the connection part, making it easier to push the clamp ring into the position of the connection part.

Such an effect makes the average diameter of the clamp ring constant over the main part of the axial length of the clamp ring before the hose and the clamp ring are pushed into the connection part, and This is also achieved by an increase in the direction of the periphery in the intermediate part, which is adjacent to the main part and which is adjacent to the periphery located on the rear side of the retaining rib.

In this case, the intermediate part is bent radially outward and outside the clamping ring, so that the peripheral edge located on the back side of the retaining rib surrounds the main part in a radial space. There is. In this way, the clamp ring always supports the hose over its entire length. Furthermore, the clamping ring widens at its front end and can be easily pushed through the retaining rib by the hose.

The peripheral edge of the clamp ring is located on the back side of the retaining rib and may be separated in the region between two adjacent web sections, and this separation may be closed by closing means. In this case, the closing means of the clamp ring may be opened before pushing the hose and clamp ring into the connection part to facilitate its operation.

The closing means may be a latch type key. Such a key is easy to handle.

In particular, the closing means may comprise mutually engaging parts formed on both sides of the separation. This simplifies the construction of the closing means.

In this case, protrusions may be formed near both sides of the cut-out and on the peripheral edge portion having the cut-out. These protrusions facilitate the operation of closing the closing means, and when closing the closing means it is necessary to bring them closer together in the circumferential direction.

In this configuration, one of the projections may form the first closure means. In this case, no additional projections are necessary which act as support means for handling the closing means when it is closed.

The present invention and its detailed configuration will be described in detail below with reference to the drawings of preferred embodiments.

(Embodiment) In the embodiment shown in FIGS. 1 and 2, the hose joint consists of a connecting portion 1 and a clamp ring 2 made of elastic synthetic resin, between which one of the hoses 3 is connected. End 4 is clamped.

The connection part 1 has a retaining rib 5 extending around it. This retaining rib 5 starts from the push-in end of the connection part 1 and ends approximately at the back end of the connection part 1. The angle of inclination of the conical side 7 of the retaining rib 5 which joins the push-in end 6 is slightly greater than the angle of inclination of the back surface 8 which has shallow teeth 9 extending away from the push-in end 6 and around it. The outer diameter of the connection 1 at the pushing end 6 is approximately 28 mm, which is somewhat narrower than the inner diameter of the hose 3, which in the unstrained state is approximately 29 mm, in order to facilitate the pushing of the hose 3.
The outer diameter of approximately 31 mm at the rear end of the connection 1 is slightly larger than the inner diameter of the hose 3 in the unstrained state, the sides 7 and 8 are approximately the same length in their axial direction, 20 mm, and the angle of inclination is are about 7° and about 3°, respectively. The maximum outer diameter of the retaining rib 5 is approximately 33 mm. The teeth 9 have a substantially serrated cross section. The conical side facing the push-in end 6 extends over an axial length of approximately 1.5 mm, and its radial side extends over an axial length of approximately 0.4 mm.
Distracted over mm. Therefore, the angle of inclination of the conical surface of the tooth 9 is approximately 15°.

The clamp ring 2 has 12 slots 12. The slot 12 is in the form of annular projections 10 and 11 and extends axially to the periphery. The slots 12 are defined by a thin web section 13 and consist of an array distributed at uniform intervals around the periphery of the clamp ring 2. The width of slot 12 is approximately 1mm
It is. The annular projections 10 and 11 are closed in the circumferential direction. Since the annular protrusion 11 supports a flange portion that projects radially inward with respect to the end surface 14 of the end portion 4, the clamp ring 2 is not pushed in further than the end portion 4. Instead of this flange part, the hose 3 can also be provided with an annular projection 15 on its outside as a stop for the clamping ring 2. The clamp ring 2 can be manufactured by omitting the flange portion projecting radially inward of the annular projection 11 and by making the annular projections 10 and 11 have the same inner diameter as the inner diameter of the web portion 13.
and the hose 3 and the clamp ring 2 together into the connection 1 over the retaining rib 5.

The slot 12 extends over at least the entire axial length of the toothed back surface 8 and preferably extends over the entire axial length of the retaining rib 5, as shown in the figures. The annular projection 10 is therefore arranged in front of the push-in end 6.

Clamp ring 2 in the area of slot 12
The inner diameter of the hose 3 is 28 mm, which is approximately equal to the outer diameter of the hose 3 in an unstrained state, and is also larger than the maximum outer diameter of the holding rib 5.

The hose coupling shown in FIGS. 1 and 2 presses the end 4 of the hose 3 against the connection part 1 over the entire axial length of the end 4, and applies a bias of the spring due to the elasticity of the web part 13 to the end 4. This has the effect of applying it to the hose material. The biasing action of the spring prevents the clamping ring 2 from being subjected to thermal expansion of the hose material in the clamping area, thereby preventing excessive pressure from being applied to the hose material. This addresses permanent deformation of the hose material. On the other hand, even if the hose material contracts after it thermally expands and continues to cool down, this structure allows the elastic web portion to return to its initial position due to the spring, so that the hose does not connect to the connection part 1. It ensures firm support. The clamp ring 2 is longer than the end 4 of the hose 3, and the clamp ring 2 has a push-in end 6.
(toward the left side in FIG. 1), this structure means that when the hose 3 is deformed (bent) in the radial direction in front of the connection part 1, the end part 4 This prevents the user from attempting to lift it, especially from the front side 7. Therefore, clamp ring 2
Due to the conical toothed structure on the back surface 8 of the retaining rib 5, the end 4 is able to snap when there is a high fluid pressure within the hose 3 or when a high axial force is applied from the outside. This increases safety against being pushed in the axial direction from the connecting part 1 or slipping.

When the hose 3 is pushed into the connection 2, the clamp ring 2 is pushed onto the hose 3 into the position shown in the figure. Next, hose 3 and clamp ring 2
together and push the connection part 1 into these. In this case, the flange 16 on the rear side of the connection part 1 or, for example, the wall corresponding to the flange 16 of the housing that connects the connection part 1 together, acts as a stop and prevents the hose from being pushed in too much. It is something to do. In other words, this construction ensures that the clamping ring 2 is in place and that its back end (annular projection 10) is outside the connection part 1.

FIG. 3 is a partially enlarged perspective view of a clamp ring 2a according to a second embodiment of the invention.
The clamp ring 2a is used in place of the clamp ring 2 for the hose joint shown in FIG. 1, and is made of an elastic plastic material. Instead of the annular projections 10 and 11, the clamping ring 2a has closed peripheral edges 10a and 11a. Retaining rib 5
A waveform is formed in the peripheral direction of the peripheral edge portion 11a located on the side surface 8 of. Further, the other peripheral edge portion 10a is flat. Furthermore, the clamp ring 22 has an axial slot 12a, which is delimited by a web portion 13a. The axial length and inner diameter of the clamp ring 2a and the slot 12a are the same as the clamp ring 2a and the slot 12a.
It may also correspond to that of

In this embodiment, the corrugated peripheral edge 11a facilitates pushing the clamping ring 2a onto the retaining rib 5. In other respects, this embodiment has the same effects as the first implementation described above.

Furthermore, other embodiments of clamp rings for the hose 3 are shown in FIGS. 4 to 9. For any of the clamp rings 2b to 2g, the average diameter (average value of the inner diameter and outer diameter) of the hose 3 and the clamp rings 2b to 2g is not shown in FIGS. The length of the main part of the clamp ring in the axial direction is constant before being pushed into the connecting part 1 shown in FIG. In the intermediate part joined to this main part and adjacent to the peripheral parts 11b to 11g located on the back surface 8 of the retaining rib 5 shown in FIG.
The increase in the average diameter towards the peripheral edges 11b-11g facilitates pushing the hose 3 and the clamping rings 2b-2g into the connection 1 over the retaining ribs 5.

In the embodiment shown in FIGS. 4 and 5, the peripheral edges 11b and 11c extend a distance parallel to the peripheral surface of the hose 3 (in the absence of applied force). Further, when the clamp ring is pushed into the connecting portion 1, the edges of the peripheral edges 11b and 11c, which are the tips, are arranged on the end surface 14 of the hose 3.

In the embodiment shown in FIGS. 6 to 8, when the clamp ring is pushed into the other connection part 1,
The peripheral edges 11d to 11f, which are the tips, are received by the front surface 14 and act as stoppers, so that the clamp ring is not pushed into the hose 3 excessively.

In the embodiment shown in FIG. 9, the curved or curved intermediate section is bent radially outward and outward of the clamping ring 2g. The peripheral edge 11g is therefore located on the back side 8 of the retaining rib when the connection part 1 is pushed into the hose, and extends also around the periphery. Moreover, the main part (before the fitting operation) is of a constant radius of the clamp ring 2g. However, the web portion 13g receives the hose 3 over its longitudinal section.

As shown in FIG. 10, the periphery of the clamp ring 2h becomes a tip during the fitting operation, and there is a cut-off 17 in the area of one of the slots 12h or between two adjacent web portions 13h. Furthermore, the slot 12h, of which the circumferential edge 10b of the back and, in the opposite part, the circumferential edge 11h, is of integral construction in the circumferential direction is closed at its end. To facilitate operation, the disconnection 17 is opened when the hose 3 and the clamp ring 2h are pushed into the connection 1. Further, after the fitting operation by the closing means 18, the cut-off 17 is closed.

The closing means 18 is a hook or snap type closing means, and has peripheral edges 1 on both sides of the cut-off 17.
It has two closing means 20 and 21 in the form of substantially radial projections formed in 1h. One of the closing means 20 is cut off on the side facing the cut-off 17, so that it has approximately the shape of a question mark. The other closing means 21 is slightly shorter than the closing means 20 in the radial direction and is cut away at its lower side away from the cut-off 17. The other protrusion 2 in the radial direction
2 is also cut away near the cut-off 17 to its underside, facilitating the closing operation of the closing means 18. In this configuration, the closure means 20 and the protrusion 22
is pushed in the circumferential direction by hand or with a tool, until the radially inner projection of the closure means 20 slides over the closure means 21 and engages with a cutout in the closure means 21. If desired, the closure means can be opened again by bending the radial portion of the closure means radially outward.

The radial protrusion 23 of the peripheral edge 11h receives the end surface 14 of the hose 3 when the clamp ring 2h is pushed, thereby preventing the clamp ring 2h from being pushed into the hose 2 excessively.

As a variant of the illustrated embodiment, for example in the embodiment of FIGS. 1 and 2, instead of the annular projection 11, the clamping ring 2 may be provided with an approximately hook-shaped peripheral edge. This peripheral edge first extends some radially inward and then some axially forward to the axially opposite end of the clamp ring 2, so that its cross-section (clamp ring 2
(within the axial plane), forming a U-shape located approximately on its side. Further, in any of the embodiments, the web portion may have a U-shaped or elliptical cross section instead of having a square or rectangular cross section. In that case, teeth corresponding to the teeth 9 may be formed on the front side 7 of the retaining rib 5 or only on the front side 7.

[Brief explanation of drawings]

1 is an axial sectional view of a hose coupling according to the invention, FIG. 2 is a radial sectional view of a clamp ring of the hose coupling shown in FIG. 1, and FIG. 3 is a second sectional view of a hose coupling according to the invention. A perspective view showing a part of the clamp ring in the example, FIGS. 4 and 5,
6, 7, 8, and 9 are sectional views of clamp rings in other embodiments of the hose joint according to the present invention, and FIG. 10 is sectional views of clamp rings in other embodiments of the hose joint according to the present invention. FIG. 1... Connection part, 2, 2a to 2h... Clamp ring, 3... Hose, 5... Holding rib, 6... Push-in end, 7... Conical side, 8... Back, 9...
Teeth, 10, 11, 20, 22... annular projection, 1
2, 12a to 12h...Slot, 13, 13a
~13h...Web portion, 14...End face, 18...
…Closing means.

Claims (1)

[Claims] 1. A connecting portion 1 that is pushed into one end of a hose 3, and clamp rings 2, 2a to 2h made of elastic bodies; and the front end of the holding rib 5 is substantially conical and directed towards the pushing end 6 of the connecting part 1 and pushed through the terminal end 14 of the hose 1, and the clamping ring 2, 2a to 2h surrounds the push-in end 6 of the hose 3 in the area of the retaining rib 5 and is closed at its axial end, a peripheral end 10a, 1
1b, and the clamp rings 2, 2
A hose coupling with slots 12; 12a to 12h extending in the axial direction of the clamp rings 2, 2a to 2h, passing through them in the radial direction and uniformly distributed in the circumferential direction; 12; 12a to 12h are separated from the push-in end 6 of the clamp ring 1 and extend longer than the axial length of the back surface 8 of the retaining rib 5, and the web portions 13, 13a to 13h between the slots 12; It is elastically bendable in the radial direction, the back surface 8 of the holding rib 5 has a substantially conical shape, and the average diameter of the web portions 13, 13a to 13h is equal to that of the hose 3 and the clamp ring 2;
A hose joint characterized in that, before being pushed into the connection part 1, the lengths a to 2h are constant at least over the main part of the length. 2. The hose joint according to claim 1, wherein the back surface 8 of the holding rib 5 is provided with a plurality of shallow teeth 9 surrounding the periphery thereof. 3. In the hose joint according to claim 2, the axial cross section of the teeth 9 has a sawtooth shape, and the side surfaces of the teeth 9 are separated from the push-in end 6 of the connecting portion 1 and are radially oriented. A hose joint characterized by being provided on the surface. 4. The hose joint according to claim 1, wherein the slots 12, 12a to 12h extend at least over the entire length of the retaining rib 5 in the axial direction. and hose fittings. 5. In the hose joint according to claim 1, the inclination angle of the rear surface 8 of the retaining rib 5 is smaller than the inclination angle of the front surface 7 of the retaining rib 5. , and the axial lengths of the front surface 7 and the rear surface 8 are substantially the same, and the outer diameter of the connecting portion 1, together with the adjacent retaining rib 5, is the same as that of the hose 3 in an unstrained state.
A hose fitting characterized by being slightly smaller than the inner diameter of. 6. In the hose joint according to any one of claims 1 to 5, the ends of the clamp rings 2, 2a to 2h are
A hose joint characterized in that the hose joint is located away from the push-in end 6 of the hose and in front of the push-in end 6 of the connecting portion 1. 7 One of claims 1 to 4
In the hose joint described in 1., the first peripheral portions 11, 11d to 11f, 11h of the clamp rings 2, 2a to 2h are connected to the hose 3.
A hose joint characterized in that the hose joint is in contact with an end surface 14 of the push-in end 6. 8. In the hose joint according to claim 1, the clamp rings 2, 2a to 2h connect the hose 3 and the clamp rings 2, 2a to 2h to the connection portion. 1 before pushing it into the slot 1.
2. A hose joint characterized by exhibiting a constant inner diameter over the entire length of the hose joint. 9. In the hose joint according to one of claims 1 to 8, the peripheral edge portion 11a of the clamp ring 2a
is arranged on the back surface 8 side of the holding rib 5,
A hose joint characterized by forming a wave shape in the direction of its circumference. 10. In the hose joint according to claim 1, the average diameter of the clamp rings 2b to 2g is the same as that of the hose 3 and the clamp ring 2.
b to 2g before being pushed into the connection part 1, are constant over the main part of the axial length of the clamp ring, and are adjacent to the peripheral edges 11b to 11g located on the side surface of the back surface 8 of the holding rib 5, And in the intermediate region joining to the main portion, the peripheral edge portions 11b to 1
A hose joint characterized by an increase in weight of 1g. 11. The hose joint according to claim 10, wherein the intermediate region is curved outward in the radial direction and outward of the clamp ring 2g, so that the peripheral edge located on the side surface 8 of the retaining rib 5 Hose coupling, characterized in that a section 11g surrounds said main part at a distance in the radial direction. 12. In the hose joint according to claim 1, the peripheral edge portion 11h of the clamp ring 2 is located on a side surface of the back surface 8 of the holding rib 5, and A hose joint characterized in that it is separated between two web parts 13h, and the separation 17 is closed by a closing means 18. 13. The hose joint according to claim 12, wherein the closing means 18 is a latch type key. 14. The hose joint according to claim 13, wherein the latch type locks 18 are formed on both sides of the cut-off 17, and are provided with rear catch portions 20 and 21 respectively. 15. The hose joint according to claim 14, characterized in that protrusions 20 and 22 are provided on the peripheral edge 11h provided on the cut-off 17 near both sides of the cut-off 17, respectively. hose fitting. 16. The hose joint according to claim 15, wherein one of the protrusions 20, 22 forms one of the hook portions.