JPS5939786Y2 - Joint structure of soft synthetic resin conduit - Google Patents

Description

[Detailed Description of the Invention] (Purpose of the Invention) The present invention relates to an improvement in the joint structure of a soft synthetic resin electric conduit.

The main purpose of this invention is to enable the conduit and the joint in a connected state to be separated by a simple operation without destroying the conduit and the joint, thereby making it possible to reuse the conduit and the joint. .

Another object of the present invention is to make it possible to accommodate electrical conduits with different nominal sizes by detachably providing a locking piece having claws that bite into the circumferential surface of the electrical conduit to the cylindrical joint.

Still another object of the present invention is to make the conduit 51C so that it can be press-fitted into the joint with a small force, and to simplify the structure and reduce manufacturing costs.

(Prior art) There are various types of conduit joints that can provide a strong connection simply by press-fitting the conduit into the joint, without using adhesives or screws. An example of this is shown in Fig. 14. There are some things shown below.

This joint consists of a steel ring B with a sharp cutting edge A formed on the inner periphery, which is held between a conduit guide sleeve C and a curled part E of the joint body. When the conduit is press-fitted, the cutting edge A slightly bites into the outer peripheral surface of the conduit to prevent the conduit from coming out.

However, this joint has the following drawbacks.

(1) If you want to change a part of the wiring route after piping, the cutting edge is wedged into the conduit and cannot be easily separated. One must be destroyed.

(3) Since ring B is fixed to the joint body, conduits with different nominal sizes cannot be connected.

Therefore, if it is necessary to change to a conduit with a different nominal size during piping work, it is necessary to replace the entire joint, which is very uneconomical.

Particularly when the joint projects integrally from the box or is glued, there is an inconvenience that the entire box must be replaced.

(3) This joint requires three parts: the ring B, the sleeve C, and the joint body, and the manufacturing cost is high because the number of parts is large, the structure is multiple, and it takes time and effort to assemble. There is.

(4) Since many cutting edges are formed on the inner periphery of the steel ring B, a large force is required when press-fitting the electric conduit, resulting in poor workability.

(Structure of the invention) In the present invention, a locking piece having a wedge-shaped claw is detachably attached to the cylindrical part of the joint, and the tip of the claw is positioned on the helical wire on the circumferential surface of the conduit. Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 This embodiment is a box connector.
In the figure, a joint body 1 has a threaded portion 2 formed at one end and a cylindrical portion 3 formed at the other end.

On the circumferential surface of the cylindrical portion 3, one or more bulges 4, some of which swell toward the outer circumference, are formed at one or more locations, and a cavity 5 is formed inside the bulges 4.

An insertion hole 6 penetrating into the cavity 5 is bored on the circumferential surface of the bulging portion 40 .

A locking piece 7 that is fitted into the cavity 5 and prevents the conduit P from being pulled out.
is made of metal or hard synthetic resin, and has a protrusion 9 on the upper surface of the base 8 corresponding to the cavity 5 that can be inserted into the insertion hole 6, and a wedge-shaped claw 10 at the tip of the base 8. It projects diagonally downward.

The ridgeline of the tip 10a of the claw 10 is formed to be inclined at a predetermined angle with respect to the axial direction K of the electric conduit P inserted into the cylindrical portion 3 (the length direction of the claw 10).

That is, the ridgeline of the tip 10a is provided along the helical wire on the circumferential surface of the electric conduit P, or along the tangent to the helical wire, and the tip 10a forms part of the external thread.

The tip 10a may be formed in a straight line, but may also be formed in an arc along the curved surface of the conduit P.

In addition, the locking piece 7 is formed with several types of claws 10 of different lengths, or with several types of base parts 8 with different thicknesses, so that it can be attached to conduits with different nominal dimensions as shown in FIG. be able to handle this as well.

When press-fitting a conduit P that matches the nominal dimensions into the above connector, insert the locking piece 7 into the space 5 and □
, the protrusion 5 may be inserted into the insertion hole 6, and the electric conduit P may be press-fitted from the open end of the hook-shaped portion 3.

When the electric conduit P is press-fitted, the pointed end 10a slightly bites into the circumferential surface of the electric conduit P, thereby preventing the electric conduit P from coming off from the cylindrical portion 3.

When a plurality of bulges 4 are provided in the cylindrical portion 3, the locking piece 7 is arranged so that the tip 10a of each pawl 10 also forms a part of the external thread of the multi-thread screw, as shown in FIG. In other words, it is preferable to position the tips 10a on different helical wires imaginary on the circumferential surface of the conduit P.

When connecting a conduit P with a smaller diameter than the nominal dimensions of the joint, remove the locking piece 7 attached to the joint and attach a locking piece 1 or claw with a wall thickness of the base 8 that is thicker than that of the locking piece 7. 10
A long locking piece 1 is attached to the space 5, and then a conduit P is press-fitted.

(Fig. 6) Conduit P and joint body 1 due to changes in electrical line, etc.
In order to separate the wires, the conduit P or the joint may be rotated in the direction opposite to the direction in which the helical wire moves.

Since the tip 10a of the claw 10 bites into the circumferential surface of the electric conduit P, the claw 10 and the electric conduit P are assembled with a pair of screws.

Therefore, when the conduit P or the connector rotates with the tip 10a biting into the curved surface of the conduit P, the tip 10a
The locus a draws a helical wire on the circumferential surface of the conduit P, and the helical wire is drawn as a streak on the surface of the conduit P.

Embodiment 2 As in Embodiment 1, this is an example of a box connector, and as shown in FIGS. It is formed in places.

The locking piece 12 fitted into the cavity 5 of the cylindrical part 3 has a protrusion 14 projecting from the upper surface of the base 13 that can be fitted into the insertion hole 11, and a wedge-shaped claw 15 is provided diagonally at the tip of the base 13. It protrudes downward.

The ridgeline of the tip 15a of the claw 15 is formed to be inclined at a predetermined angle with respect to the axial direction of the electric conduit P inserted into the cylindrical portion 3 (the length direction of the claw 15).

That is, the ridgeline of the tip 15a is provided along the helical wire on the circumferential surface of the conduit P, or is provided along the tangent to the helical wire, and the point 15a forming a part of the male thread is in the embodiment construction. The same is true for

The tip 15a may be formed in a straight line, but may also be formed in an arc along the curved surface of the conduit P.

The locking pieces 12 are formed with several types of claws 15 of different lengths, or with bases 13 of different thicknesses, so that they can be used with electrical conduits with different nominal sizes.

Embodiment 3 This embodiment is an example of a switch box, and as shown in FIGS. 10 to 13, a bulge 18 is formed on the circumferential surface of a node 17 protruding from the outer surface of the box body 16. A cavity 19 is formed inside the bulge 18 .

The bulge 18 at the end of the cylindrical portion 17 is 1. A notch 20 is formed by cutting out in a concave shape.

The locking piece 21 inserted into the cavity 19 has two protrusions 23 protruding from the upper surface of the base 22 so as to face each other.

The distance between the protrusions 23 is determined by the inner wall surface 16 of the box body 16.
This corresponds to the distance m between a and the inner surface of the notch 20.

A wedge-shaped claw 24 is provided on the lower surface of the base 22 and projects diagonally downward.

The shape of the claw 24 is the same as in Example 1 and Example 2 (/c).

The locking piece 21 is formed with several types of claws 24 of different lengths, or with bases 22 of different thicknesses, so that it can be used with electrical conduits having different nominal dimensions.

When a plurality of bulges 18 are provided in the cylindrical portion 1T, each claw 2
It is preferable to arrange the locking piece 21 so that the pointed end 24a of the locking piece 24 forms a part of the external thread of the multi-thread screw.

This is similar to Example IK. Examples 1 to 3
In either case, when the conduit P is press-fitted into the cylindrical part 3 or 17, the tips 10a of the wedge-shaped claws 10, 15, 24,
15a and 24a strongly press against the circumferential surface of the electric conduit P, and further bite into the circumferential surface of the electric conduit P slightly, thereby preventing the electric conduit P from being pulled out from the cylindrical portion 3 or 17.

As described in the first embodiment, in order to separate the electric conduit P and the joint once combined, the electric conduit P or the joint is rotated in the opposite direction to the direction in which the helical wire advances.

(Effect of idea) Since the present invention has the above configuration, it has the following advantages.

(1) The tip of the claw of the locking piece is curved so that it is located on the helical wire that is imagined on the circumferential surface of the conduit and acts as part of the male thread, so that once the conduit and the joint are connected, The two can be easily separated by rotating either the conduit or the joint in the opposite direction to the direction in which the helical wire advances.

Therefore, there is no need to destroy the conduit or the joint as in the past, and work can be done quickly, improving work efficiency, and the conduit and the joint can be reused, leading to savings in materials.

(2) By installing a plurality of locking pieces and positioning the tip of each locking piece on a multi-strand helical wire, the work efficiency when separating the conduit and the joint can be significantly improved. I can do it.

(3) Even if the conduit has a different nominal size from the joint, it can be handled by simply replacing the locking piece, so even if you have to change to a conduit with a different nominal size during piping, the locking piece can be used. There is no need to replace the joint just by replacing it, and the work can be carried out quickly and economically.

(4) Since this joint has a simple structure consisting of two parts, the cylindrical part and the locking piece, it can be manufactured at low cost.

(5) Since the number of claws on the locking piece is small, no large force is required to press the conduit.

Therefore, the electric conduit can be easily press-fitted, resulting in a remarkable improvement in workability.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of the first embodiment of the present invention, Fig. 2 is a sectional view taken along line M-M in Fig. 1, Fig. 3 is a perspective view of the locking piece, and Fig. 4. 1 is a sectional view taken along the line 0N-N in FIG. 1, FIG. 5 is a partially cutaway front view of another example of the first embodiment, and FIG. 6 is a sectional view showing a state in which a locking piece with a long claw is attached. , FIG. 7 is a partially cutaway front view of the second embodiment, and FIG.
9 is a perspective view of the locking piece, FIG. 10 is a front sectional view of the third embodiment, and FIG. 11 is a Y-Y line in FIG. 10.
12 is a partially broken plan view, FIG. 13 is a perspective view of the locking piece, and FIG. 14 is a partially broken front view of a conventional example. (Explanation of symbols of main parts) 3, 17...Knodal part, 4.18...Bulging part, 5, 19...
Blank space? , 12゜21...Locking piece, 10, 15
, 24...nail, 10a. 15a, 24a... Tip.

Claims (2)

[Scope of utility model registration request] (1) In a joint that connects a conduit to a conduit or a conduit to a box, a part of the circumferential surface of the cylindrical part 3, 17 is bulged toward the outer circumferential direction to create a void space 5, 19 inside. Forming bulges 4, 18 with downward wedge-shaped claws 10,
15, 24 are provided protrudingly, and the claws 10, 15, 24
The ridge lines of the tips 10a, 15a, 24a are the claws 10, 15.2
Locking pieces 7, 12, which have an inclination angle with respect to the length direction of 4.
21, and attach these locking pieces 7, 12, 21 to the empty space 5°1.
A joint structure for soft synthetic resin electrical conduit that can be detachably attached to 9. (2) A plurality of spaces 5, 19 are provided in the cylindrical portions 3, 17, and a locking piece? , 12.21 into each of the spaces 5, 19, and the tip 10a of the claw 10, 1524 of each locking piece 7, 12, 21.
, 15a and 24a are located on different helical windings.A joint structure for a soft synthetic resin electric conduit according to claim 1, wherein the utility model registration claims 15a and 24a are located on different helical wires.