JPH0518550Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a pipe body in which a plurality of short pipes are connected.
In particular, it relates to a tube body that bends only in two specific directions.

(Prior Art) During construction work on piping such as cable protection pipes and electrical conduits, unexpected obstacles may exist in the pipelines, and the piping must be routed to avoid the obstacles. In order to respond to such situations,
Publication No. 43739 discloses a short piece in which an engaging piece having a bulging portion at the tip is provided along the circumference at one end, and an engaging groove portion having an entrance narrower than the thickness of the bulging portion at the other end. Consisting of a plurality of tubes, the bulging part of the engagement piece of each short tube is inserted into the engagement groove of the adjacent short tube and engaged so as to be slidable in the tube axis direction, so that the engagement A tube body is described that can be bent at a predetermined curvature by sliding the mating portion.

(Problem to be solved by the invention) However, since the above-mentioned pipe body has the characteristic of bending in all directions, it is necessary to prevent it from bending in undesired directions during piping work, making it extremely difficult to handle. The problem was that it was difficult to In addition, if unexpected stress is applied to the pipe due to ground movement after construction, the above-mentioned pipe will follow the ground movement and bend, causing the cable inserted inside the pipe to become excessively tight. There was a risk of being strained and being cut off.

The present invention was made to solve the problems of the prior art, and its purpose is to solve two specific problems.
The object of the present invention is to provide a tube body that bends only in one direction.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the tubular body of the present invention is provided with an engaging piece having a bulged portion at the tip along the circumference at one end, and the engaging piece having a bulging portion at the tip, Consisting of a plurality of short tubes each having an engaging groove having an inlet narrower than the thickness of the bulging portion, the bulging portion of the engaging piece of each short tube is inserted into the engaging groove of the adjacent short tube. In the tube body that is inserted and engaged so as to be slidable in the tube axis direction, two stoppers are arranged diametrically so as to protrude outward from the tube end on the side where the engagement groove is provided. It is characterized by the fact that it is set up.

(Function) In the tube body of the present invention, two pieces of stoppers are provided diametrically opposite each other at the tube end on the side where the engaging groove portion is provided so as to protrude outward from the tube end.
It bends only along a plane perpendicular to the plane connecting the two stoppers, and is not obstructed by the stopper in other directions.

(Example) An example of the present invention will be described with reference to the drawings.

Reference numeral 1 denotes a short tube that constitutes a structural unit of the tube body of the present invention, and includes a short tube main body 2, an engagement piece 3 provided along the circumferential direction at one end of the short tube body, and an engagement groove 4 at the other end. ,
It consists of two stoppers 5, 5, which are arranged diametrically opposite each other so as to protrude outward from the tube end on the sides of the engagement groove 4. A bulging part 31 is provided at the tip of the engaging piece 3, and the whole has an arrow shape, and the entrance 41 of the engaging groove part 4 is made slightly narrower than the bulging part 31, so that the inner space is closed. The portion 42 has a size such that it can slide in the tube axis direction when the bulging portion 31 of the engagement piece 3 of another adjacent short tube 1 is inserted therein. Preferably, the tubular body 1 is integrally formed of synthetic resin or the like.

The stopper 5 is integrally protruded from the end surface of the outer wall 43 of the engagement groove 4 in the tube axis direction, and its inner surface 51 is connected to the short tube main body 1 of the adjacent short tube 1.
is a plane parallel to the tangential direction of Therefore, the stopper 5 comes into line contact with the outer circumferential surface of the adjacent short tube 1 along the tube axis direction, or comes close to it. In this embodiment, the stopper 5 has a rectangular parallelepiped shape, the length in the tube axis direction is 1/50 to 1/30 of the inner diameter of the short tube 1, and the tangential width is 1/50 to 1/30 of the inner diameter of the short tube 1.
It is made to be 1/10 to 1/5 of the inner diameter of.

By inserting and engaging the engaging pieces 3 of the short tubes 1 into the engaging grooves 4 of adjacent short tubes 1, the necessary number of short tubes 1 are successively connected to obtain the tube body of the present invention.
An annular packing is interposed within the engagement groove 4 to make elastic contact with the inner wall surface of the engagement groove 4 and the engagement piece 3, or it is engaged with the inner wall surface of the entrance 41 of the engagement groove 4. It is preferable to cover the piece 3 with an elastic body that can make elastic contact with it, since it is possible to prevent underground water or the like from entering the pipe body through the engagement groove part 4.

The tube body thus obtained has engaging pieces 3 at both ends.
Either cut and remove the engagement groove 4 and connect it to another pipe, or have a socket or insertion port at one end and connect it to the engagement piece 3 or the engagement groove 4 at the end of the tube at the other end. Another short tube having an engaging portion to be engaged may be connected to other tubes.

Although the tubular body having a circular cross section has been described above with reference to the drawings, the tubular body of the present invention is not limited thereto, and may be, for example, an irregularly shaped tube having an oval cross section.
Particularly, in the case of an oval tube having vertical directionality, the present invention that limits the bending direction is suitable.

(Effects of the invention) As detailed above, the pipe body of the present invention has two stoppers arranged diametrically at the end of the pipe on the side where the engaging groove is provided so as to protrude outward from the end of the pipe. Since they are arranged opposite to each other, they are bent only along a plane perpendicular to the plane connecting the two stoppers, and are not obstructed by the stoppers from bending in other directions. Therefore, there is no need to prevent the pipe from bending in an undesired direction when constructing the pipe, making the construction very easy. In addition, after piping construction, even if stress is applied to the pipe body from a direction other than the direction in which it is already bent due to ground movement, the pipe body will not easily bend along with the ground movement.
There is less risk of damaging the internal cables.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of one embodiment of a tube body of the present invention; FIG. 2 is a cutaway front view of an upper half of an example of a short tube which is a constituent unit of one embodiment of the tube body of the present invention;
FIG. 1 shows a short pipe; 2 shows a short pipe body; 3 shows an engagement piece;
4...engagement groove portion, 5, 5...stopper.

Claims (1)

[Scope of utility model registration request] Consisting of a plurality of short tubes, each of which has an engaging piece having a bulging portion at its tip extending along the circumferential direction at one end, and an engaging groove portion having an inlet narrower than the thickness of the bulging portion at the other end. , in a tube body in which the bulging portion of the engagement piece of each short tube is inserted into the engagement groove of an adjacent short tube and is slidably engaged in the tube axis direction, an engagement groove is provided. 1. A tube body characterized in that two pieces of stoppers are arranged diametrically opposite each other on the side of the tube where the stoppers are protruded outward from the tube end.