JPS63310312A - Pipe joint for corrugated flexible pipe - Google Patents

Abstract

PURPOSE:To certainly obtain a removal-proof effect after a corrugated flexible pipe is fitted on, by providing one side of a bayonet ring, with elastic hearing projections which can be elastically deformed in the diameter direction of the bayonet ring, and by providing the tips of the bearing projections with removal- proof projections. CONSTITUTION:This pipe joint for a corrugated flexible pipe is composed of a bayonet ring 1, a hinge piece 2, and a connecting piece 3. The bayonet ring 1 is circular, and its central opening is set to he a flexible pipe bayonet base 4. The hinge piece 2 is formed in the shape of bendable sheets, and the sheets are arranged to be linearly symmetrical at two positions on the outer periphery of the bayonet ring 1. So far as the connecting piece 3 is concerned, its one end is integrally connected to the hinge piece 2, and the other end is set to be a box connecting section 6 having a go-line slot on the center. On one side of the upper side of the bayonet ring 1, elastic bearing projections 16 are arranged at four periphery-directional equal-angle positions. The elastic bearing projections 16 are projected in the axial direction of the bayonet ring 1, and at the tips of the respective projections 16, removal-proof projections 7 orthogonal to the projections 16 to form 'T'-types are arranged.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to a pipe joint for a corrugated flexible pipe.

[Background technology]

The corrugated flexible tube is laid on the floor in advance for floor wiring, etc., and is used to route cables and the like inside. FIG. 15(a) and crest) show an example of a pipe joint used to connect such a corrugated flexible pipe to a wiring box. This pipe joint for corrugated flexible pipe has a joint body 5
0, a bag neck) 51, and a grip ring 52.

iii. The hand main body 50 is a cylindrical body and has a box connection part 53 at its base, and is fixed to the wiring box 54 at this part. The grip ring 52 is housed inside the tip of the joint body 50. The grip ring 52 has a retaining protrusion 57 on its inner circumferential surface that fits into a groove on the outer circumferential surface of the flexible tube 56, and its outer circumferential surface abuts against the inner circumferential tapered surface 58 of the joint body 50. It has a tapered surface. A thread is formed on the outer peripheral surface of the tip of the joint body 50 (not shown), and when the cap nut 51 having a threaded portion that fits this screw tightens the joint body 50, the diameter of the grip ring 52 is reduced to prevent it from coming off. The protrusion 57 bites into the groove on the outer circumferential surface of the corrugated flexible tube, and the corrugated flexible tube 56 is prevented from slipping out from the joint body 50.

By the way, in the conventional corrugated flexible pipe fitting, the retaining protrusion 68 is fixedly provided on the inner circumference of the connecting piece 61, 61, so once the assembled pipe fitting is attached to the wiring box, Even if an attempt is made to insert the corrugated flexible tube after that, the retaining protrusion 68 acts as a resistance and the insertion cannot be carried out efficiently.
There was a procedural restriction that required simultaneous installation at the stage when 61 was combined.

[Purpose of the invention]

In view of the above circumstances, the present invention not only has excellent productivity and ease of assembly, but also enables cost reduction.
In particular, the corrugated flexible tube can be installed efficiently, either at the same time when the connection pieces are assembled, or when it is attached to the wiring box later. The object of the present invention is to provide a pipe joint for a corrugated flexible pipe that can reliably prevent the pipe from coming off later.

[Disclosure of the invention]

In order to achieve the above object, the present invention provides an insertion ring whose central opening serves as a flexible tube insertion port into which a corrugated flexible tube is inserted, and at least the inner peripheral surface of the insertion ring has a semi-cylindrical surface shape. Two connecting pieces are connected at the same end in the axial direction via a hinge piece, and these connecting pieces are
A cylindrical body is formed by being combined by bending at the hinge piece portion, and the internal space formed between the two serves as a cylindrical tube insertion hole through which the corrugated flexible tube inserted into the insertion ring is inserted;
A box connecting part is provided on the outer periphery of the other end of the cylindrical body to be inserted into the wiring opening of the wiring box and fixed to the box, and at least one inner periphery is provided with a box connecting part that is inserted into the wiring opening of the wiring box and fixed to the wiring box. In a pipe joint for a corrugated flexible pipe that is provided with a retaining protrusion that fits into a groove on the outer circumferential surface of the flexible pipe to be inserted, one side of the insertion ring is elastically deformed in the radial direction of the insertion ring. A flexible elastic support protrusion is provided, and a retaining protrusion is provided at the tip of the intermediate support protrusion so as to be located near the entrance of the tube insertion hole when combined,
When the corrugated flexible tube is inserted into the retaining protrusion, the elastic support protrusion elastically deforms and escapes to rotate in the outer diameter direction, allowing the corrugated flexible tube to be inserted, while the elastic support protrusion elastically returns. The gist of the present invention is a pipe joint for a corrugated flexible pipe, which is characterized in that when it is returned by force, it fits into a concave groove on the outer peripheral surface of the corrugated flexible pipe to prevent the corrugated flexible pipe from coming off. .

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.

1 to 3 illustrate one embodiment of the invention. As shown in these figures, this corrugated flexible pipe joint includes an insertion ring 1, a hinge piece 2.2, and a connecting piece 3.3.
It consists of The insertion ring 1 is circular and has a central opening serving as a flexible tube insertion port 4. Said hinge piece 2.
2 are provided at two locations on the outer periphery of the insertion ring 1 so as to be line symmetrical. Each of the connection pieces 3.3 has a semi-cylindrical shape, and one end thereof is integrally connected to the hinge piece 2, and the other end is a box connection part 6 having a wire passage hole 5 in the center. There is. Furthermore, a pipe stopper surface 8 is provided on the inner circumferential surface of each connecting piece 3 . Each connection piece 3 is formed into a perfect semi-cylindrical shape, and mating surfaces 9 are formed at both ends in the circumferential direction. Each connection piece 3 is bent at the hinge piece 2. The surfaces 9.9 are brought into close contact with each other and form a cylinder. A half screw 10.10 is provided on the outer periphery of the box connection 6.6. These screws 10.degree. 10 together form one screw.

Incidentally, on one upper side of the insertion ring 1, four elastic support protrusions 16 are arranged at equiangular positions in the circumferential direction.

These elastic support protrusions 16 project in the axial direction of the insertion ring 1, and at the tip of each protrusion 16, a retaining protrusion 7 is provided in a T-shape perpendicular thereto.
is provided. Each protrusion 7 has a triangular cross section,
It is formed into an arcuate shape, the outer diameter side surface is an outer surface 7a, the inner diameter side inclined surface is a cam surface 7b, and the inner peripheral end is an engaging protrusion. It is designated as part 7C.

Both of the connecting pieces 3.3 are bent via the hinge piece 2 and the mating surfaces 9 are brought together to form one cylindrical body. The box connecting portion 6.6 at one end of the box similarly forms a cylindrical portion, and when the cylindrical box connecting portion 6.6 is inserted into the wiring opening 13 of the wiring box and the lock nut 11 is screwed, the corrugated The flexible pipe fitting is fixed. The retaining protrusion 7 is fitted into an inner circumferential groove 17 formed on the inner circumference of the connecting piece 3 so that its outer surface 7a is in contact with the inner circumferential groove 17.

The engaging protrusion 7C is oriented in the inner radial direction so as to protrude from the inner periphery of the tube insertion hole 18, and the cam surface 7b is oriented obliquely toward the flexible tube insertion port 4. In addition, the elastic support protrusion 16
is in contact with the inner circumferential surface 17. The corrugated flexible tube 14 may be installed at the same time as the connecting piece 3.3 is bent, or after it is fixed with the lock nut 11. If the corrugated flexible tube 14 is installed at the same time, the corrugated flexible tube 14 The tip of the tube 14 should be in contact with the tube stopper surface 8, and the groove 15 should be in contact with the retaining protrusion 7.
so that it fits. As a result, the retaining protrusion 7
After the corrugated flexible tube 14 is securely prevented from coming off, the box connecting portion 6 is inserted into the wiring opening 13, and the lock nut 11 is attached to the screw 10 to fix the pipe joint. If the pipe joint is first fixed to the box 12 and then the corrugated flexible tube 14 is inserted, the ridges of the corrugated flexible tube 14 can be removed by inserting the corrugated flexible tube 14 through the insertion port 4. hits the cam surface 7b and acts to kick the engagement protrusion 7C. Accordingly, the elastic support protrusion 16 protrudes inward and elastically deforms in a waving manner, and the retaining protrusion 7 rotates as shown by the two-dot chain line in FIG. The protrusion 7C comes to escape in the direction of the inner circumferential groove 17. As a result, the corrugated flexible tube 14 is inserted into the tube insertion hole 18 so that its tip comes into contact with the tube stopper surface 8. At that point, the engaging protrusion 7C of the retaining protrusion 7 fits into the groove 15 of the corrugated flexible tube 14 due to elastic return, and in this way, the corrugated flexible tube 14 is reliably prevented from coming off. The state will be as follows.

In this way, the corrugated flexible tube 14 may be installed either at the same time as the connecting piece 3.3 is bent or after it has been fixed with the lock nut 11. Since the procedure for assembling the flexible tube 14 is not strictly required, it is advantageous for the operator.

FIGS. 4 to 14 show a pipe joint for a corrugated flexible pipe that has been more concretely implemented. This corrugated flexible pipe fitting has a plug ring 26 as described above.
It integrally includes a hinge piece 27 and a pair of connecting pieces 28 and 29. At the center of the insertion ring 26, there is a flexible tube insertion port 3.
0 is formed, and a fitting groove 31 having an angular cross-section is formed in the upper inner peripheral portion of the insertion ring 26. In this fitting groove 31, fitting protrusions 32.32 protruding from each end of the connecting pieces 28.29 are provided on both connecting pieces 28.2.
9 are designed to fit together when stacked on top of each other. From the fitting groove 31, four elastic support protrusions 33 facing in the axial direction of the insertion ring 26 are arranged at equiangular positions in the circumferential direction, and a retaining protrusion 34 is integrally provided at each tip. Each of the retaining protrusions 34 has a triangular cross section and is formed into an arc shape when viewed from above, and when the connecting pieces 28 and 29 are put together, they are placed back to back on the inner periphery of one end of each connecting piece 28 and 29. It is considered a thing. At this time, the elastic support protrusion 33 passes through both sides of the stopper 35.35 protruding from the inner periphery of one end of each connection piece 28.29, and comes into contact with the inner periphery 436.
Further, each retaining protrusion 34.34 has a stopper 35.3.
5 from the rear side. Each retaining protrusion 34.34 is elastically deformed together with the elastic support protrusion 33, so when the corrugated flexible tube is inserted into both the connecting pieces 28.29, which have become one cylindrical body, the retaining protrusions 34. It escapes and deforms due to the force, allowing insertion of the corrugated flexible tube until it hits the tube stopper surface 37. When the corrugated flexible tube hits the tube stopper surface 37 and stops, the retaining protrusion 34 fits into the groove of the corrugated flexible tube due to its elastic return force, and even if you try to pull out the corrugated flexible tube, it will not come out. The stopper protrusion 34 prevents it from coming off. At this time, the stopper 35 mechanically reliably prevents the elastic support protrusion 33 from being elastically deformed and the retaining protrusion 34 from coming off from within the connection piece 28, 29.
．． 29 is provided with a fitting groove 38.38 on the inner side of both ends in the circumferential direction, and the other side is provided with the fitting groove 38.38.
A fitting projection 39,39 is provided which fits into the interior through elastic deformation. The fitting protrusion 39 is adapted to fit tightly into the fitting groove 38. Each connection piece 28.
At the axial end of 29, a half-split screw 40, 40 is formed as a box connection.

Note that the insertion ring may have a shape other than circular, and the means for fixing the pipe joint to the wiring box may be other than screws and lock nuts;
Although the connecting pieces were designed to come into close contact when folded together, they may be of a type that leaves a gap as in the past.

〔Effect of the invention〕

As described above, the pipe joint for corrugated flexible pipe according to the present invention has at least the inner circumferential surface on the outer peripheral part of the insertion ring whose central opening serves as the flexible pipe insertion port into which the corrugated flexible pipe is inserted. A connecting piece consisting of two pieces each having a semi-cylindrical surface shape is connected via a hinge piece at the same end in the axial direction of each piece, and these connecting pieces are brought together by bending at the hinge piece, and there is a connection between the two pieces. The internal space formed in the insertion ring becomes a cylindrical tube insertion hole through which the corrugated flexible tube inserted into the insertion ring is inserted, and a wiring box is attached to the outer periphery of the other end of the cylindrical body. A box connection part is inserted into the wiring opening and fixed to the box, and at least one of the inner peripheral parts is fitted into a groove on the outer peripheral surface of a flexible tube inserted into the pipe insertion hole. In a pipe joint for a corrugated flexible pipe that is equipped with mating retaining projections, an elastic support projection that is elastically deformable in the radial direction of the insertion ring is provided on one side of the insertion ring, and A retaining protrusion is provided at the tip so as to be located near the entrance of the tube insertion hole when the corrugated flexible tube is inserted. While it escapes by rotating in the radial direction to allow insertion of the corrugated flexible tube,
When restored by the elastic return force of the elastic support protrusion, it fits into the groove on the outer circumferential surface of the corrugated flexible tube and regulates the bending of the corrugated flexible tube.This improves productivity and ease of assembly. In addition to being excellent at reducing costs and reducing costs, it is also possible to
The corrugated flexible tube can be installed efficiently whether it is attached to the wiring box or later, and the corrugated flexible tube can be reliably installed to prevent it from coming off later. It is something that

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the corrugated flexible pipe fitting of the present invention, Fig. 2 is a perspective view showing the developed state of the corrugated flexible pipe fitting, and Fig. 3 is the same. FIG. 4 is an exploded perspective view showing an assembled state, FIG. 4 is a plan view showing an embodiment of the corrugated flexible pipe fitting at the practical level, FIG. 5 is a cross-sectional view taken along the line of FIG. The figure is a bottom view of Fig. 5, Fig. 7 is a sectional view taken along line N-N of Fig. 5, and Fig. 8 is a cross-sectional view taken along line M-- of Fig. 5.
M line sectional view, Figure 9 is a Y-Y line sectional view of Figure 5, Figure 10
The figure is a sectional view taken along the line X-X of FIG. 5, FIG. 11 is a right side view of FIG. 5, FIG. 12 is a sectional view taken along the Z-Z line of FIG. 14 is a detailed view of the hinge part, and FIG. 15 shows a conventional pipe joint for a corrugated flexible pipe. 16 shows another conventional example, and the same figure (ta) shows the corrugated flexible tube. Figure (b) is a perspective view of the pipe joint in its unfolded state, Figure (b) is a perspective view of its assembled state, and Figure (C1) is a cross-sectional view of its assembled state in the box. 1.26. ...Insert ring 2.27...Hinge piece 3
．． 28.29... Connection piece 4.30... Flexible tube insertion port 6... Box connection part 7, 34... Retaining protrusion 12... Wiring box 13... Opening for wiring 14...Hatsuke Flexible Pipe Agent Patent Attorney Takehiko Matsumoto! I2 diagram

Claims (1)

[Claims] (1) On the outer periphery of the insertion ring whose central opening serves as a flexible tube insertion port into which a corrugated flexible tube is inserted, there is a connecting piece consisting of two pieces whose inner peripheral surface is at least semi-cylindrical. They are connected at the same end in the axial direction via a hinge piece, and these connecting pieces are brought together by bending at the hinge piece part, and the internal space formed between them is connected to the wave inserted into the insertion ring. A box that is a cylindrical body with a cylindrical tube insertion hole through which a flexible tube is inserted, and the other end of the cylindrical body is inserted into the wiring opening of the wiring box and fixed to the box. A pipe joint for a corrugated flexible pipe, which includes a connecting part and a retaining protrusion that fits into a groove on the outer peripheral surface of the flexible pipe inserted into the pipe insertion hole on at least one inner peripheral part. , an elastic support projection that is elastically deformable in the radial direction of the insertion ring is provided on one side of the insertion ring, and is located at the tip of the support projection near the entrance of the tube insertion hole when the insertion ring is assembled. A retaining protrusion is provided, and the retaining protrusion operates to escape so that when the corrugated flexible tube is inserted, the elastic support protrusion elastically deforms and rotates in the outer radial direction. It is characterized by allowing the insertion of the corrugated flexible tube, and when restored by the elastic restoring force of the elastic support protrusion, it fits into a groove on the outer circumferential surface of the corrugated flexible tube and prevents the corrugated flexible tube from coming out. Pipe fitting for corrugated flexible pipe.