JPH055792Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an externally corrugated tube having a locking structure and having parallel waves formed on its external surface.

(Prior Art) Conventionally, as for a corrugated tube having this type of locking structure, the present applicant has already published Japanese Patent Application No. 167700/1983 (Japanese Patent Application No.
63-28209), an externally corrugated tube 90 shown in FIG. 11 is cited.

This externally corrugated pipe 90 has a locking protrusion 92 protrudingly formed on the outer periphery of its trough 91 (small outer diameter part), and is inserted into a pipe insertion hole 94 of a piping device such as a box 93. After the locking protrusion 92 is inserted into the provided notch, the corrugated tube 90 is rotated, so that the locking protrusion 29 and the peak portion 95 of the corrugated tube 90 are rotated.
(Large outer diameter part) Pipe insertion hole 9 of box 93
The box 93 is fixed to the box 93 by fitting the peripheral wall No. 4 into the box 93.

(Problem to be Solved by the Invention) However, in the conventional externally corrugated tube 90, it is very difficult to insert and fix the corrugated tube 90 into the tube insertion hole 94 provided through the wall surface of the box 93, etc. However, when inserting and fixing a corrugated tube into a cylindrical tube insertion section provided in a coupling or connector, there is no peripheral wall that should be inserted into the tube insertion section, so this corrugated tube is not suitable for the coupling. 90 cannot be fixedly connected.

Therefore, in order to securely connect and fix the corrugated pipe to a coupling ring, etc., an annular fixing member 98 is attached to the pipe insertion portion 97 of the coupling ring 96 as shown in FIG.
is attached, and the locking claws 99 protruding from the inner peripheral surface of the fixing member 98 are aligned with the troughs 91 of the corrugated tube 90 to lock the peaks 95, and then the screws 98a of the fixing member 98 are fixed. I'm trying to tighten it.
Alternatively, a separate elastic annular locking pawl is provided on the inner surface of the tube insertion portion of the coupling ring, and the locking pawl is engaged with the troughs of the corrugated tube to lock the peaks.

In this way, in the conventional corrugated pipe, it is not possible to securely connect and fix the pipe to the coupling unless the screw 98a of the fixing member 98 of the coupling 96 is tightened or a separate elastic annular locking pawl is provided on the coupling. There was a problem where I was told that I couldn't do it.

Therefore, the purpose of the present invention is to provide a simple connection structure for a cylindrical tube insertion part such as a coupling,
Moreover, it is an object of the present invention to provide a corrugated tube that has a locking structure that ensures a secure connection state and that can be connected to a tube insertion portion at a plurality of locations in the length direction.

(Means for Solving the Problems) In order to achieve the above object, the externally corrugated pipe of the present invention is an externally corrugated pipe in which parallel waves are formed on the outer periphery by peaks and troughs, and the above-mentioned adjacent The invention is characterized in that a plurality of grooves are formed by cutting out parts of two or more peaks.

(Function) With the configuration described above, when connecting the corrugated pipe having this locking structure to a piping device such as a connector or coupling, the corrugated pipe is set to an appropriate length,
Cut at the valley between the two kerfs. Then, the peak portions provided with the kerfs are placed at the ends of both cut corrugated tubes. Therefore, the end of the corrugated pipe is inserted into the pipe insertion part of the piping device with the cut groove corresponding to the locking protrusion protruding from the inner surface of the pipe insertion part. Then, the locking protrusion passes through the groove and corresponds to the trough inside the peak, so when the piping device such as the corrugated pipe, connector, or coupling is rotated, the locking protrusion will be pulled out by the peak. will be stopped.

(Example) Next, an example of an externally corrugated tube embodying the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the corrugated tube 10 having this locking structure has a large outer diameter portion 11 as a plurality of protruding annular ridges formed at regular intervals on its outer periphery. In addition, small outer diameter portions 12 as troughs are formed on both sides of each large outer diameter portion 11 to form parallel waves.

Further, as shown in FIG. 1, this corrugated tube 10 is provided with a plurality of continuous grooves 13, for example, two grooves 13, which are formed by cutting out a part of two adjacent large outer diameter portions 11. There is. The kerfs 13 are provided at predetermined intervals in the longitudinal direction, and are provided in pairs at opposing positions 180 degrees apart on the outer periphery of the large outer diameter portion 11, as shown in FIG. This kerf 1
The depth of 3 is not particularly limited, and may be shallow as long as a locking protrusion 22 of a piping device to be described later can pass therethrough. Note that the predetermined interval may be appropriately selected within a wide range from several centimeters to several meters, as necessary. Furthermore, as shown in FIG. They may be provided in a continuous manner. In this case, the corrugated tube 10
All can be used effectively by changing the cutting position appropriately.

Furthermore, the kerf 13 is formed on the outer periphery of the large outer diameter portion 11.
A plurality of them may be provided at opposing positions separated by 90 degrees or 60 degrees.

Further, in the corrugated tube 10 of this embodiment, as shown in FIG. 2, a recess 14 is formed on the side surface of the large outer diameter portion 11 in which the kerf 13 is provided.

Next, the coupling 20 as a piping device to which the corrugated pipe 10 is connected will be explained. This coupling 20 is a cylindrical pipe into which the corrugated pipe 10 is inserted, as shown in FIGS. 2 and 5. An insertion portion 21 and four locking protrusions 22 protruding from its inner surface.
It is equipped with As shown in FIG. 6, the locking protrusion 22 is provided so as to be able to pass through the cut groove 13 and to be approximately the same width as the small outer diameter portion 12, and has a side surface thereof. A protrusion 23 with which the recess 14 engages is formed.

Next, to explain the function of this corrugated pipe 10, when connecting this corrugated pipe 10 to a coupling 20 as a piping device, first connect the corrugated pipe 10 to two adjacent pipes provided with grooves 13. Large outer diameter portion 11
Cut at the small outer diameter portion 12 between the two (A-A line in FIG. 1). Then, as shown in FIG. 3, large outer diameter portions 11 provided with kerfs 13 are disposed at both ends of the cut corrugated tube 10. Therefore, in the corrugated pipe 10 of the present invention, both cut ends can be connected to a piping device, which is very convenient.

Next, the end of the corrugated tube 10 is inserted into the tube insertion portion 21 with the cut groove 13 of the corrugated tube 10 corresponding to the locking protrusion 22 of the coupling ring 20 . Then, as shown in FIG. 6, the locking protrusion 21 of the coupling ring 20
It passes through the kerf 13 and corresponds to the small outer diameter section 12 inside the large outer diameter section 11 . Therefore, by rotating the coupling ring 20 or the corrugated tube 10, the protrusion 23 of the locking protrusion 21 is inserted into the recess 1 of the large outer diameter section 11 as shown in FIG.
4, the corrugated tube 10 and the coupling 29 can be easily connected despite the simple structure, and furthermore, the connection state between the corrugated tube 10 and the coupling 29 can be maintained reliably. Ru.

Furthermore, since the locking protrusion 22 of the coupling ring 20 is reliably prevented from coming off by the large outer diameter portion 11 of the corrugated tube 10, even if a large force is applied to the corrugated tube 10, the corrugated tube can be removed from the coupling 20. 10 is never left out.

Similarly, when the end of the corrugated tube 10 is inserted on the opposite side of the tube insertion part 21 of the coupling ring 20 with the cut groove 13 corresponding to the locking projection 22, the locking projection 21 is inserted as shown in FIG. , passing through the kerf 13 and corresponding to the small outer diameter portion 12 . Therefore, by rotating the coupling ring 20 or the corrugated tube 10, the protrusion 23 of the locking protrusion 21 is inserted into the recess 14 of the large outer diameter portion 11 as shown in FIG.
When engaged with the corrugated tube 1 as shown in FIG.
0 and the coupling ring 29 can be easily and reliably connected.

If the piping device to which this corrugated pipe 10 is connected is equipped with a cylindrical pipe socket (pipe insertion part) such as a coupling or a connector, an end cover temporary frame that protects the end of the corrugated pipe may be used. Of course, bushing or the like may also be used.

In addition, this idea forms parallel waves on the outer periphery, and if it is an externally corrugated tube with peaks (large outer diameter section) and troughs (small outer diameter section), it can be used as an externally corrugated tube with a smooth inner surface. The material, shape, thickness, and use (corrugated tube into which a light bulb is inserted, corrugated tube into which a fluid pipe is inserted, etc.) may be implemented without departing from the spirit of the present invention. It may be implemented with appropriate changes.
Further, the depth of the cut groove 13 may be changed as appropriate without departing from the spirit of the present invention.

(Effects of the invention) As detailed above, in the externally corrugated pipe of the invention, a plurality of kerfs are formed by cutting out parts of two or more adjacent peaks forming parallel waves. Therefore, if the corrugated pipe is cut in the middle of the kerf at an appropriate length, both of the cut corrugated pipes can be connected to the coupling ring at any point, and the cutting position can be selected arbitrarily, making it easier for piping work. , which has extremely excellent effects.

Furthermore, the simple structure does not require attaching fixing members to piping devices such as connectors and coupling rings and tightening screws, or providing separate elastic annular locking claws. It has the excellent effect of being able to fix the connection.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of an externally corrugated pipe having a locking structure embodying the present invention, Fig. 2 is a perspective view of an externally corrugated pipe and a coupling, and Fig. 3 is a perspective view of an externally corrugated pipe with a locking structure. 4 is a perspective view of a modified example of the externally corrugated tube embodying the present invention, FIG. 5 is a front view of the coupling, and FIG. 6 is a side view of the externally corrugated tube inserted into the coupling. Figures 7, 8 and 9 are
FIG. 10 is a side view of an externally corrugated tube connected to a coupling, FIG. 11 is a perspective view of an externally corrugated tube connected to a coupling, and FIG. 11 is a corrugated tube with a locking structure connected to a conventional box. FIG. 12 is a perspective view of a conventionally used coupling. Explanation of symbols, 10...Externally corrugated tube, 11...Large outer diameter portion as a peak, 12...Small outer diameter portion as a trough, 13...kerf, 14...recess, 20... Coupling as a piping device, 21...pipe insertion portion, 22...locking protrusion.

Claims (1)

[Claims for Utility Model Registration] An externally corrugated pipe in which parallel waves are formed on the outer periphery by peaks and troughs, wherein two or more adjacent peaks are partially cut out to form a plurality of notches. An externally corrugated tube characterized by having grooves formed therein.