JP3132800B2 - Flexible tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible pipe used, for example, for drainage of domestic water in houses and the like.

[0002]

2. Description of the Related Art Conventionally, flexible pipes made of synthetic resin have been used for the convenience of piping of drainage pipes. Such flexible pipes, for example, are formed along the peripheral surface of a soft pipe made of a soft material. A corrugated body made of a hard material having a substantially S-shaped cross-section and both ends of which are bent in parallel in opposite directions is spirally wound, and the corrugated body thus wound is formed. A flexible tube is known in Japanese Utility Model Publication No. 4-1298, in which adjacent bent tips are movably engaged with each other in the pipe axis direction and are integrally connected.

[0003] However, when the above-mentioned flexible pipe is piped at an inclination, for example, to take a water gradient, the pipe deflects vertically in the vertical direction due to its flexibility in the middle of the pipe which should not be bent. There was a risk that smooth drainage would be hindered. Therefore, it is necessary to provide a large number of supporting devices for preventing the bending of the flexible tube from below at narrow intervals, and the piping work is complicated and extra cost is required as compared with a straight pipe such as a non-flexible PVC pipe. There was a problem.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an object of the present invention so that flexibility can be restricted in a portion where flexibility is adversely affected while retaining the original flexibility. Another object of the present invention is to provide a flexible tube capable of performing a piping operation efficiently. Therefore, the flexible tube according to the present invention
The inner layer made of a soft material has an almost smooth inner layer, and a strip made of a hard material is spirally wound around the outer layer of the inner layer to connect the side edges thereof, and the outer surface has an uneven portion along the axial direction. In the flexible tube comprising the formed outer layer, the bending restricting pieces having the projections fitted into the recesses are fitted linearly along the axial direction at positions opposed to each other in the circumferential direction of the flexible tube. It is characterized by the following. Further, a locking portion is provided on the protrusion of the bending control piece, and when this protrusion is fitted into the concave portion of the outer layer, the protrusion is engaged with the locked portion provided on the strip to prevent the bending control piece from falling off. Things.

According to the present invention, one or two or more bending restricting pieces separately formed at positions opposed to each other in the circumferential direction of a flexible tube at a portion where a straight piping state is required without requiring flexibility. Is arranged, and the protrusion formed on the lower surface thereof is merely fitted into the concave portion of the outer layer. For example, the flexible tube has the original flexibility in the left-right direction but has little flexibility in the up-down direction. By piping with the direction in which the flexibility of the flexible tube is regulated being vertical, it is possible to minimize the bending of the piping, and it is possible to omit the provision of a support device more than necessary. In the case where a locking portion is provided on the projection of the bending control piece and this projection is engaged with the locked portion provided on the strip when fitting the projection into the concave portion of the outer layer, the bending restriction is provided. It is possible to completely prevent the piece from coming off, and the above effects can be expected.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a flexible tube according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a flexible tube 1 before bending is restricted, in which a tape made of a soft synthetic resin (for example, soft vinyl chloride resin) is spirally wound, and adjacent side edges of the wound tape are joined together. An inner layer 2 formed integrally and a hard synthetic resin formed on bent front ends 4a, 4a of which the cross section is substantially S-shaped along the outer peripheral surface of the inner layer 2 and whose opposite ends are parallel to each other. An outer layer formed by spirally winding a strip 4 made of, for example, hard vinyl chloride resin), and connecting the adjacent bent tips 4a of the wound strip 4 by movably engaging each other in the tube axis direction. 3 is comprised. Then, the inner peripheral surface of the inner layer 2 is formed substantially smooth,
An uneven portion is formed on the outer surface of the outer layer 3 along the tube axis direction.

FIG. 2 shows an example of the bending restricting piece 10, and a rod-shaped main body 11 made of a hard synthetic resin and having an appropriate length.
A large number of protrusions 12 are formed integrally on one surface at a constant interval (in accordance with the pitch of the concave and convex portions of the flexible tube 1).

FIG. 3 shows a flexible tube 1 having a plurality of bending restricting pieces 1.
FIG. 4 shows a state where 0 and 10 are fitted linearly, and the protrusions 12 of the main body 11 are sequentially fitted into the concave portions 5 on the surface of the outer layer 3.
As shown in FIG. 1, the bending restricting pieces 10 and 10 are continuously fitted on respective surfaces of the flexible tube 1 at positions shifted by approximately 180 degrees in the vertical direction. Thereby, the flexible tube 1 can bend in the left-right direction, but the flexibility in the up-down direction is limited.

FIG. 5 shows another embodiment of the present invention.
The rib-like locked parts 7, 7 are projected from both ends of the strip 4 forming the convex part 6, and the projection 12 of the bending regulating piece 10 is formed.
A mushroom-shaped locking portion 13 is bulged at the tip of the
3 is fitted into the groove of the concave portion 5 of the outer layer 3 to engage with the locked portions 7 of the strip 4, and the bending regulating piece 10 is
It is for completeness so that it does not fall off during use.

[Brief description of the drawings]

FIG. 1 is a partially longitudinal side view of a flexible tube according to an embodiment of the present invention, showing a state before restricting bending.

FIG. 2 is a perspective view showing an example of a bending restriction piece.

FIG. 3 is a diagram showing a procedure for fitting a bending restriction piece to a flexible tube.

FIG. 4 is a view showing a state in which a bending restriction piece is fitted to a flexible tube.

FIG. 5 is a partial longitudinal sectional side view of a flexible tube showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Flexible tube 2 ... Inner layer 3 ... Outer layer 4 ... Stripe 5 ... Concave part 6 ... Convex part 7 ... Locked part 10 ... Bending control piece 11 ... Body 12 ... Projection part 13 ... Locking part

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seiji Hattori 6 Titan Sports Remer Co., Ltd., Shizuoka Pref. In the factory (56) References Japanese Utility Model Sho 62-172886 (JP, U) Japanese Utility Model Sho 57-134485 (JP, U) Registered utility model 3005417 (JP, U) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) F16L 11/16

Claims (2)

(57) [Claims] 1. An inner layer made of a soft material and having a substantially smooth inner peripheral surface, and a strip made of a hard material spirally wound around the outer periphery of the inner layer to connect the side edges thereof together with the outer surface in an axial direction. A flexible tube comprising an outer layer having an uneven portion formed along the outer surface of the flexible tube. A flexible tube characterized by being fitted into a flexible tube. 2. A locking portion is provided on a projection of a bending restricting piece, and when the projection is fitted into a concave portion of an outer layer, the engaging portion is engaged with a locked portion provided on a strip to remove the bending restricting piece. Claim 1 which prevented
A flexible tube according to any one of the preceding claims.