JPS6321407B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a synthetic resin flexible tube that is used to protect electric wires and ensure electrical safety when wiring between electrical equipment such as machine tools and equipment, and control panels. This is related to the improvement of

Prior Art As a conventional flexible tube, a tube body 2 is formed by spirally winding roll-formed steel strips 1 having a rectangular S-shaped cross section while engaging each other in the lateral direction, as shown in FIG. In addition, a flexible tube 4 shown in FIG. 2 in which the outer periphery of the tube body 2 is coated with a soft synthetic resin to form an outer peripheral coating 3;
Alternatively, there is a flexible tube 7 shown in FIG. 3 in which the outer periphery of the tube body 2 is coated with a soft synthetic resin so that the space 5 of the steel strip 1 is also filled with a peripheral coating 6.

When the flexible tubes 4 and 7 are bent as shown in FIG. 4, the bent inner peripheral portion of the outer peripheral coating 3 of the flexible tube 4 protrudes in the radial direction, forming wave-shaped wrinkles 8. As for the flexible tube 7, as shown in FIG.
is formed, and the engagement between the steel strips 1 of both the flexible tubes 4 and 7 becomes loose, making them easy to come off as shown in FIG.

As a result, if the flexible tubes 4 and 7 are bendably installed, for example, between the main body of a machine tool and a spindle head on a slide table, or along the arm of a robot, the repeated formation of wrinkles 8 is avoided. As a result, not only the outer peripheral coatings 3 and 6 are torn, but also the engagement between the steel strips 1 becomes loose, making them more likely to come off, and the electric wires inside the flexible tubes 4 and 7 are exposed to the outside.

Purpose of the Invention The present invention provides a hard synthetic resin strip that is spirally wound to form a tube, and has an engagement surface formed on the side surface of the hard synthetic resin strip that is in contact with the side surface to prevent at least the outer peripheral coating from moving in the radial direction. By providing a flexible tube, the aim is to eliminate the above-mentioned drawbacks of the prior art.

Structure of the Invention As shown in FIG. 7, the present invention has a cross section approximately S.
The outer periphery of a tubular body 10 in which letter-shaped hard synthetic resin strips 9 are wound in a spiral manner while being engaged with each other is coated with a soft synthetic resin by filling the spaces 11 of the strips 9. to form a peripheral coating 12, and engage with the peripheral coating 12 on the side surface of the band-shaped body 9 to form the peripheral coating 12.
Engagement surface 1 for preventing radial movement of 2
3 is made of synthetic resin flexible tube.

Further, as shown in FIG. 8, the present invention has the same structure as the flexible tube shown in FIG. The synthetic resin flexible tube further has a mating surface 15 formed thereon.

Embodiment of the Invention FIG. 9 and FIG. 11 show a first embodiment of the present invention, in which the side surface of a hard synthetic resin strip 16 having a substantially S-shaped cross section, in this case, the strip 16 is attached to each other. When the tube body 17 is wound spirally while being engaged in the lateral direction, the side surface exposed to the outside of the tube body 17 has an engaging surface 1 having a triangular wave shape in cross section or a serrated shape as shown in FIG.
8 is easily formed by continuous extrusion molding, and
The outer periphery of the tubular body 17 is coated with a soft synthetic resin, filling the space 19 of the strip 16 to form an outer periphery coating 20.

When the flexible tube 21 formed in this way is bent, the outer circumferential coating 20 is formed on the bent inner circumferential surface of the outer circumferential coating 20.
Although an external force is applied to cause the 0 to protrude in the radial direction, it does not protrude in the radial direction because the outer peripheral coating 20 filled in the space 19 of the strip 16 engages with the engagement surface 18 on the side surface of the strip 16. There isn't.

Therefore, even if the flexible tube 21 is bent, the outer periphery will not protrude and become unsightly.Furthermore, since wrinkles will not occur in the outer periphery coating, shortening of the life of the flexible tube 21 due to bending can be prevented, and the flexible tube 21 can be bent. The durability of the tube 21 can be significantly improved.

Next, FIGS. 12 and 13 show a second embodiment of the present invention, in which a tube body 23 is formed by engaging the side surfaces of the strip body 22 that engage with each other in the lateral direction. 3 for preventing relative movement of the band-like body 22 in the radial direction;
The flexible tube 25 is formed by forming the engagement surface 24 of a square-shaped projection.
The configuration, operation, and effects are almost the same as those of the first embodiment, except that the engaging surface 18 of the first embodiment prevents the outer peripheral coating 26 from protruding and also prevents the strip 22 from shifting in the radial direction. The same is true.

Next, FIGS. 14 and 15 show a third embodiment of the present invention, in which an engaging surface 29 having a semicircular cross section or an engaging surface 29 having a semicircular cross section or In addition to forming the triangular engagement surface 30,
The configuration, operation, and effects are almost the same as those of the second embodiment.

Next, FIG. 16 shows a fourth embodiment of the present invention, in which a band 31 is formed so that its space 32 is dovetail-shaped, and tubes are formed by engaging each other. The configuration, operation, and effects are almost the same as those of the second and third embodiments, except that the displacement of the band-shaped body 31 and the protrusion deformation of the outer peripheral coating 34 when the body 33 is bent are prevented.

Effects of the Invention The present invention provides a hard synthetic resin strip that is spirally wound to form a tube body, and has an engagement surface formed on the side surface of the hard synthetic resin strip that is in contact with the side surface to prevent the outer peripheral coating from moving in the radial direction. This flexible tube made of synthetic resin is additionally formed with an engaging surface that prevents the flexible tube and the band-shaped body laterally engaged with the side surface of the band-shaped body from shifting in a direction perpendicular to each other.

With this, the present invention prevents the outer peripheral coating from protruding to the inner periphery of the bending and causing wrinkles when the flexible tube is bent, and also prevents the band-shaped body from disengaging and coming off. The object of the present invention is to significantly improve the durability of the flexible tube when it is bent and used.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a steel strip 1 in a conventional embodiment, and FIG.
The figure is a partially cutaway front view of the flexible tube 4, FIG. 3 is a partially cutaway front view of the flexible tube 7, FIGS. 4 to 6 are explanatory views showing the bent state, and FIG. The figure is an overall configuration diagram clearly showing the configuration of the first invention, and FIG.
9 is a partially cutaway front view of the first embodiment of the present invention, FIG. 10 is a perspective view of the band-like body 16, and FIG. 11 is an engagement surface thereof. 12 is a partially cutaway front view of the second embodiment of the present invention, FIG. 13 is a perspective view of the band-shaped body 22, and FIGS. 14 and 15 are illustrations of another example of the second embodiment of the present invention. An explanatory diagram of the third embodiment, FIG. 16 is the fourth embodiment of the present invention.
It is an explanatory diagram of an example. 9, 14... Band-shaped body, 10... Tube body, 11...
Space portion, 12... outer peripheral coating, 13, 15... engagement surface.

Claims (1)

[Scope of Claims] 1. A belt of soft synthetic resin is wrapped around the outer periphery of a tube body in which hard synthetic resin belts having a substantially S-shaped cross section are laterally engaged with each other and wound spirally. A circumferential coating is formed by coating the body space in a state in which it is filled, and an engaging surface is formed on the side surface of the band-shaped body to engage with the circumferential coating and prevent the outer circumferential coating from moving in the radial direction. A synthetic resin flexible tube characterized by: 2. A hard synthetic resin band whose cross section is approximately S-shaped is wound spirally around the tube body while engaging each other in the lateral direction, and a soft synthetic resin is placed in the space of the band. Cover the filled state to form an outer coating,
and, on the side surface of the strip, an engagement surface that engages with the outer peripheral coating to prevent the outer coating from moving in the radial direction, and an engagement surface that prevents the mutually engaged strip from moving in a direction perpendicular to the plane. A flexible tube made of synthetic resin characterized by forming.