JPS5915821Y2 - Flexible hose connection head structure for double-wound connection steel pipes - Google Patents

Description

[Detailed description of the invention] This invention has an outwardly bulging head 3 at the end of a connecting pipe body 2 made of a double-wound steel pipe having a slight linear groove 1 in the longitudinal direction at the winding end edge. Regarding the improvement of the connection head structure of a flexible hose made of rubber or synthetic resin in a double-wound connecting steel pipe that is installed as a supply path for oil supply, air supply, etc. to vehicles, machines, or various equipment, etc. A plurality of concave and convex grooves 5, 5, etc. having a sawtooth or wavy cross section orthogonal to the linear concave groove 1 in the longitudinal direction of the end edge of the winding are arranged in parallel, and the plurality of concave and convex grooves arranged in parallel are The depth of the grooves 5, 5... is substantially the same as the depth of the linear groove 1 in the longitudinal direction, so that the linear groove in the longitudinal direction of the end edge of the winding is cut into pieces. As a feature and an embodiment thereof, the outer surface 4 of the bulging head 3 is formed into a circular arc surface, and the top of the circular arc surface 4 is provided with a protruding top surface 4' having a continuous arc surface shape.
is protruded, and the plurality of concave and convex grooves 5, 5... are arranged in parallel on the protruding top surface 4', or the bulged head 3
The outer surface 4 of the is formed into a series of approximately abacus bead shapes including a flat protruding top surface 4'' at the top, and the plurality of grooves 5, 5 and 5 are formed on the flat protruding top surface 4''. ... are installed in parallel, and the straight groove on the protruding top surface of the bulging head of the double-wound steel pipe is cut and erased to prevent leakage with the connection hose connected to it. In addition, the plurality of grooves are intended to prevent loosening and disconnection caused by vibrations applied to the connecting portion or changes in fluid pressure.

In the drawings, 6 indicates a protruding edge at the tip of the connecting tube body 2.

Conventionally, as shown in FIGS. 9 and 10, an outwardly bulging head 3 is provided at the end of a connecting pipe body 2 made of a double-wound steel pipe having a slight linear groove 1 at the winding end edge. Flexible hose connection heads in double-wound connection steel pipes of a similar construction are generally known.

Generally, in double-wound steel pipes, 1. A slight linear groove in the longitudinal direction with a depth of about 0.07 mm to 0.1 mm is formed at the end of the winding, and the flexible hose can be attached to the bulging head of the conventional structure as described above. When the bulge head is attached, this slight linear groove in the longitudinal direction will cause leakage between the engagement surfaces, causing problems.Also, since the outer surface of the bulging head is smooth, However, if vibration or fluid pressure changes occur at the connection, it may loosen or come loose.

In addition, prior Utility Application No. 180226 (1982)
No. 97280), the pipe joint structure at the end of the pipe is a bridge or spool bulged at or near the end of a small-diameter double-wound steel pipe by buckling in the axial direction. When the seat surface or outer peripheral wall surface that abuts or engages with the member is in a straight pipe state before bridge or spool processing, a groove extending in the longitudinal direction of the axis is pressed on the outer peripheral surface in advance, and this groove is leveled to have a smooth surface. The configuration thereof is publicly known.

However, even in this prior design, since the structural part extending in the longitudinal direction of the shaft center is not completely erased, leakage occurs between the engagement surfaces with the flexible hose, and the bulging head of the structure is not completely erased. Since the outer surface is smooth, if vibration or fluid pressure changes occur at the connection, it is inevitable that the connection will come loose or come out.

In contrast, the invention of this application eliminates these drawbacks of the conventional structure.According to the invention of this application, there is a double groove having a slight linear groove 1 in the longitudinal direction at the winding end edge. A cross section perpendicular to a linear groove 1 in the longitudinal direction of the winding end edge of a double-wound connecting steel pipe in which an outwardly bulging head 3 is provided at the end of a connecting pipe main body 2 that is hollowed out of a double-wound steel pipe. A plurality of uneven grooves 5, 5, etc. in a sawtooth shape or a wave shape are arranged in parallel, and the plurality of uneven grooves 5, 5, etc. are arranged in parallel.
The depth of the groove 1 is approximately the same as the depth of the linear groove 1 in the longitudinal direction, and the linear groove 1 in the longitudinal direction of the winding end edge is cut into pieces, so that the expansion of the double-wound steel pipe is prevented. By cutting and eliminating the linear groove on the protruding top surface of the protruding head, it is possible to prevent leakage between the connection hose and the connection hose, and the plurality of uneven grooves prevent vibrations or fluid pressure applied to the connection part. This is extremely useful as it can prevent loosening and loosening caused by changes.

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of this invented structure, Figs. 2 and 3 are enlarged sectional views taken along lines II and II in Fig. 1, and Fig. 4 is an enlarged cross-sectional view taken along lines II-III in Fig. 2. 5 is a front view of another embodiment, FIG. 6 is an enlarged sectional view taken along the line IV-IV in FIG. 5,
Fig. 7 is a sectional view taken along the line ■-■ in Fig. 6, Fig. 8 is a front view (partially cut away) of another embodiment, Fig. 9 is a front view of the conventional structure, and Fig. 1
FIG. 0 shows an enlarged sectional view taken along the line VI-VI in FIG. In the drawings, the same reference numerals indicate the same or equivalent parts, 1 is a linear groove in the longitudinal direction, 2 is the connecting pipe body, 3 is the bulging head, 4 is the outer surface thereof, 4/, 4// are the protrusions. On the top surface, 5 indicates an uneven groove.

Claims (3)

[Scope of utility model registration request] (1) A double-wound connection in which an outwardly bulging head 3 is provided at the end of a connecting pipe body 2 made of a double-wound steel pipe with a slight linear groove 1 in the longitudinal direction at the end of the winding. It is a steel pipe, and the protruding top surface of the outer surface 4 of the bulging head 3 has a plurality of uneven grooves having a serrated or wavy cross section orthogonal to the linear groove 1 in the longitudinal direction of the winding end edge. 5, 5... are arranged in parallel, and the plurality of parallel grooves 5° 5...
The depth of the groove 1 is approximately the same as the depth of the linear groove 1 in the longitudinal direction, and the linear groove 1 in the longitudinal direction of the winding end edge is cut into pieces and erased. Flexible hose connection head structure in heavy-wound connection steel pipes. (2) The outer surface 4 of the front bulging head 3 is formed into an arcuate surface,
A protruding top surface 4' in the form of a circular arc that is continuous with the top of the circular arc surface 4 is protruded, and the plurality of grooves 5, 5, . . . A flexible hose connection head structure in a double-wound connection steel pipe according to claim 1, which is a utility model registration. (3) The outer surface 4 of the bulging head 3 is formed into a series of approximately abacus beads including a flat protruding top surface 4'' at the top, and the flat protruding top surface 4'' has a plurality of A flexible hose connection head structure in a double-wound connection steel pipe according to claim 1, wherein the concave and convex grooves 5, 5, . . . are arranged in parallel.