FR2614672A1 - Connection end-fitting for flexible hose - Google Patents

Abstract

Connection end-fitting for a flexible hose, made from a tube section 2 in a single component with a sealing head 3 having: a cylindrical part 4 with an external diameter which is greater than that of the section of tube; a collar part 5 with an even larger diameter; and a sealing cone 6 whose external diameter decreases towards the free end of the head 3. The cylindrical part 4 results from a first flared part 7 whose internal diameter D1 is greater than the normal internal diameter D of the tube section 2. This flared part 7 is followed by an annular fold 8 forming the collar part 5, followed by a second flared part 9 with an internal diameter which decreases towards the free end 6a which forms the sealing cone 6. The maximum internal diameter D2 of the second flared part 9 is greater than the normal internal diameter D of the rest of the tube section.

Description

26 1 4672

  FITTING HOSE FOR FLEXIBLE HOSE

  The invention relates to a connection end piece for flexible pipe, consisting of a section of tube having at one of its ends a sealing head, which has, at its end adjacent to the section of tube, a cylindrical part whose diameter outside is larger than that of the tube section and, connecting to the cylindrical part, a flange part whose diameter is larger than that of the cylindrical part, then. a sealing cone which is connected to the flange part and whose diameter

  outside decreases towards the free end of the sealing head.

  Such connection nipples are used as connection pieces, for example on flexible pipes for heating oil or for fuel. The sealing heads are standardized by standard DIS 3863 or 3868. Up to now, the sealing heads have been produced only as turned parts. They have, in their cylindrical part, a bore whose diameter

  is slightly larger than the outside diameter of the tube section.

  The first end of the tube section is introduced into the bore, and the tube section is then brazed or welded to the sealing head. The separate manufacture of the sealing head and the subsequent soldering or welding, however, have the consequence of

2 6 1 4 6 7 2

26147? 2

  Renare expensive la: manufacture of the connecting piece for flexible pipe. hn addition, soldering or welding can be the monkey of sealing leaks. The invention therefore aims to réaiiser a connection piece for flexible pipe, of the type indicated at the beginning, the manufacture of which will be economical and with which no leakage can occur at the junction between sealing head and section of tube. According to the invention, this object is achieved by the fact that the sealing head and the tube section are in one piece, the wall of the tube having at one end of the tube section a first enlargement which has an inner diameter more larger than the normal internal diameter of the remainder of the tube section and which forms the cylindrical part, by the fact that the wall of the tube has, following the first enlargement, an annular fold curved outwards, which forms the flange part , and by the fact that the wall of the tube has, following the annular fold, a second enlargement which has an inner diameter decreasing towards the free end of the sealing head, and which forms the sealing cone, the larger inside diameter of the second enlargement also being larger than the inside diameter

  normal from the rest of the pipe section.

  Such a connection end piece for flexible pipe can be produced relatively economically by cold forming the first end of the tube section. The sealing head is produced by widening the first end of the tube, in combination with a discharge carried out thereafter. These shaping operations without removal of chips can be carried out relatively economically. As the sealing head forms a constituent part of the tube section, that is to say it is produced by cold forming the first end of the tube section, no leakage can exist between the head

  and the rest of the pipe section.

  The characteristics and advantages of the invention will appear

  more fully in the description presented in the following, at

2 6 1 4 6 7 2

  by way of nonlimiting example, with reference to the appended drawing, the figures of which represent - FIG. 1, a first exemplary embodiment, partly in side view and partly in longitudinal section; and - Figure 2, a second embodiment, partly in

  side view and partly in longitudinal section.

  The connecting piece 1 for flexible pipe consists of a straight or curved tube section, 2, at a first end of which is formed the sealing head 3. This sealing head 3 is in one part with the section of tube 2. A flexible hose, for example a hose for heating oil or for fuel, can be fixed in a known manner to the other end, not shown, of the section

of tube 2.

  The sealing head 3 has a cylindrical part 4, a flange part 5 with a diameter larger than that of the cylindrical part 4, and a sealing cone 6. The outer contour of the sealing cone 6 shown in FIG. 1 , and its axial height up to

  the flange part 5, are fixed by standard D1R 3863.

  To form the sealing head 3, the tube section has a first enlargement 7 whose internal diameter D1 is larger than the normal internal diameter D of the rest of the tube section

  2. The cylindrical part 4 is formed by the first widening 7.

  In addition, the wall of the tube has, following the first widening 7, an annular fold 8 curved (directed) inwards, which forms the flange part 5. I following the annular fold 8, which is formed by discharge axial of the wall of the tube, a second enlargement 9 is provided, the internal diameter of which decreases or narrows towards the free end 6a of the sealing head. The largest internal diameter D2 of the second enlargement 9 is also larger than the normal internal diameter D of the rest of the section of

  tube. The sealing cone 6 is formed by the second enlargement 9.

  The reduction in diameter of the second widening 9, in the direction of the free end 6a, can be obtained by widening the section of tube, followed by a discharge. Due to this cold deformation, the sealing head 3 constituted by the wall of the tube has a

Z 6 1 4 6 7 2

  wall thickness s substantially constant over its entire length.

  It is against the flange part 5 that is supported, during assembly, in a known manner, the connection nut 10 with which the sealing cone 6 is supported in the internal cone, not shown, of the conjugate connection part. . The embodiment of a connection end piece 1 'for flexible pipe shown in FIG. 2 differs from the example of embodiment shown in FIG. 1 only by the external shape, therefore also by the internal shape, of the sealing 6 ', or widening 9'. This outer shape of the sealing cone 6 ′ corresponds to standard DUI 3868. For the other parts of the connection end piece 1 ′, the same references have been used as for the embodiment shown in FIG. 1 , and the explanations presented in connection with the latter apply in a similar manner to the connection end piece (for flexible hose) shown

in figure 2.

2614.672

  REVND 1CAT IOnS 1. Connection piece for flexible pipe, consisting of a tube section having at its ends a sealing head, which has, at its end adjacent to the tube section, a cylindrical part whose outside diameter is larger than that of the tube section and, connecting to the cylindrical part, a flange part whose diameter is larger than that of the cylindrical part, then a sealing cone which connects to the flange part and whose diameter outside decreases towards the free end of the sealing head, characterized in that the sealing head (3) and the tube section (2) are in one piece, the wall of the tube having at one end of the tube section a first enlargement (7) which has an internal diameter (Dl) larger than the internal diameter nurmal CD) of the rest of the tube section (2) and which forms the cylindrical part (4), by the fact that the tube wall present, at the following the first enlargement (7), an annular fold (8) curved outwards, which forms the flange part (5), and by the fact that the wall of the tube has, following the annular fold (8), a second enlargement (9, 9 ') which has an inner diameter decreasing towards the free end (6a) of the sealing head - (3), and which forms the sealing cone ({, 6'), the larger internal diameter (D2) of the second enlargement (9, 9 ') being also larger than the normal internal diameter CD) of the rest of the

tube section (2).

  2. connecting piece according to claim 1, characterized in that the sealing head <3) closed by the tube wall has a wall thickness (s) substantially constant throughout

its length.