JPS63310311A - Pipe joint for corrugated flexible pipe - Google Patents

Abstract

PURPOSE:To increase strength for fixing to a distributing box and contrive a unit to be fitted on easily and exactly, by providing the box connecting sections of respective connecting pieces, with the half-type screw sections of screw sections with fitted lock nuts. 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 be 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. One end of the connecting piece 3 is set to be a box connecting section 6, and on the outer periphery of the section 6, half-type screws 10, 10 are respectively arranged, and these screws 10, 10 are put together to form one screw. By inserting the box connecting section 6 through the wiring opening section 13 of a distributing box 12 and by screwing a lock nut 11 into, the pipe joint for the corrugated flexible pipe is fixed to the distributing box 12.

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 napft 51, and a grip ring 52.

The joint main body 50 is a cylindrical body and has a box connection part 53 at its base, and is fixed to a 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.

However, as mentioned above, this corrugated flexible pipe joint has the following problems:
゛Since it consists of three parts: the joint body 50, the cap nut 51, and the grip ring 52, the number of parts is large, which not only increases the product cost, but also poses inconveniences in terms of dimensional control and quality control. . Moreover, bag nut 51
Since it is necessary to connect the joint body 50 and the joint body 50 with screws, it is time-consuming to assemble the joint body 50, and the mold for manufacturing them becomes structurally complicated, which increases the cost. Further, since the joint body 50 has a built-in grip ring 52, its outer diameter becomes large, and therefore there is a certain limit to the miniaturization of the pipe joint for a corrugated flexible pipe.

In view of this, the applicant has proposed a one-piece corrugated flexible pipe joint as shown in FIGS. 16(1) to 16(C). This corrugated flexible pipe joint has an insertion ring 60 and two connection pieces 61.61 connected to hinge pieces 62.62.
It is designed to connect via. To explain this in detail, the insertion ring 60 is circular, and its central opening is
A flexible tube insertion port 62 into which a corrugated flexible tube 62 is inserted. Each connection piece 61 has a semi-cylindrical shape obtained by dividing a cylindrical body into two, and one end in the axial direction is integrally connected to the hinge piece 63.63 provided at a position facing the outer periphery of the insertion ring 60. are doing. The reconnection piece 61.61 is the hinge piece 63.6
3 is bent to form one cylindrical body 7. Each other end of the connection piece 61.61 is a box connection part 66 that is inserted into a wiring opening 65 of a wiring box 64. A retaining protrusion 68 is provided on the inner circumferential surface of each of the connecting pieces 61 to fit into a groove 67 on the outer circumferential surface of the corrugated flexible tube 56 . This corrugated flexible pipe joint is made by combining the reconnection pieces 61 and 61 by bending at the hinge piece 63 to form one cylindrical body, and then connecting the box connection part 66, which is the base, to the wiring box. It is inserted into the wiring opening 65 and fixed. The corrugated flexible tube 56 is set at the same time when the connecting pieces 61 and 61 are combined, and at this time the retaining protrusion 68
is prevented from coming off by engaging with the groove 67.

However, in this integrated corrugated flexible pipe joint, even if the reconnection pieces 61.61 are combined, the connection pieces 61.61.
There is a problem that the 61 comrades do not come into perfect contact with each other, and a slight gap 69 remains between them, resulting in poor appearance.If this corrugated flexible pipe joint is used for embedding work such as concrete embedding, the gap 69 will be removed. There was also the inconvenience that it could not be used for this construction because there was a risk of cement paste flowing in from No. 69. Furthermore, since the box connection part 66 is groove-shaped and is fixed to the wiring box by engaging with the edge of the wiring opening 65, not only is the fixation unstable, but also the caliber Box connection part 6 with a common diameter for openings 65 of different sizes and plate thicknesses
6 is difficult to accommodate, and even if it were installed, there was a risk that it would lead to an unstable fixing state, so there was also the problem that the types of compatible boxes were limited.

[Purpose of the invention]

In view of the above circumstances, the present invention not only has excellent assemblability and can reduce costs, but also has excellent fixing strength to the wiring box, and the opening diameter and plate thickness of the wiring box are slightly different. To provide a pipe joint for a corrugated flexible pipe that can be easily and reliably installed even when the pipes are connected, has a good appearance, and can be applied to concrete embedding work because gaps are not likely to be formed between the connecting pieces.

[Disclosure of the invention]

In order to achieve the above-mentioned object, the present invention provides a plug ring having a central opening as a visible tube insertion port into which a corrugated flexible tube is inserted, and on the outer periphery thereof, the inner peripheral surface is semi-cylindrical. A connecting piece consisting of two pieces is 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, and an internal space is formed between the two pieces. The space is a cylindrical tube insertion hole through which the corrugated flexible tube inserted into the insertion ring is inserted, and the other end of the cylindrical body has a wiring opening in the wiring box on the outer periphery. A box connecting portion is inserted into the box and fixed to the box, and at least one inner peripheral portion has a retaining protrusion that fits into a groove on the outer peripheral surface of the flexible tube that is inserted into the tube insertion hole. In the pipe joint for corrugated flexible pipes, the box connection part of each connection piece has a threaded part into which a lock nut is fitted, in a part that is inserted into the wiring opening of the wiring box and faces the inner periphery of the wiring box. The gist of this invention is a pipe joint for a corrugated flexible pipe, which is characterized by having a half-split threaded part.

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. the hinge piece 2,
2 is formed into a bendable thin plate shape, and is provided at two locations on the outer periphery of the insertion ring 1 so as to be line symmetrical. The connection pieces 3.3 each consist of a pair of semi-cylindrical shapes, one end of which is integrally connected to the hinge piece 2.2, and the other end of which is connected to a box having a wire passage hole 5 in the center. This is a connecting portion 6. Furthermore, a retaining protrusion 7 is provided on the inner periphery of each connecting piece 3, and a pipe retaining surface 8 is provided on the back side thereof. The reconnection piece 3.3 is provided with mating surfaces 9.9 at both ends in the circumferential direction, and is bent at the hinge piece 2.2 to meet these mating surfaces 9.
．． 9 are brought into close contact with each other to form one cylindrical body. These mating surfaces 9.9 are in close contact with each other over the entire length in the axial direction. Further, half-shaped screws 10, 1 are provided on the outer periphery of the box connection parts 6, 6.
0 are provided respectively, and these numbers 10.10
are adapted to form one screw together.

As mentioned above, the reconnection piece 3.3 is made by bending the hinge piece 2.2 so that the mating surfaces 9, 9 are aligned with each other,
It is designed to form one cylindrical body. The box connection part 6.6 at the base end similarly forms a cylindrical part, and by inserting this cylindrical box connection part 6.6 into the wiring opening 13 of the wiring box and screwing the lock nut 11, A pipe joint for a corrugated flexible pipe is fixed to a wiring box 12. The corrugated flexible tube 14 may be inserted simultaneously when the connecting piece 3.3 is assembled by bending, or it may be inserted after the pipe joint is fixed with the lock nut 11. From this insertion,
The tip of the corrugated flexible tube 14 hits the tube stopper surface 8, and the retaining protrusion 7 engages with the groove 15, so that the corrugated flexible tube 14 is prevented from coming off.

In this way, the reconnection pieces 3.3 are fitted together without any gaps,
In addition, since the fixation is done by the screw 10 and the lock nut 11, the corrugated flexible pipe fitting is
Not only is it extremely strong, but even when used in the underground construction work, concrete and moisture do not enter through the gaps, and there is no fear that these will enter the wiring box and cause trouble. In addition, since a fixing method using screws 10 and lock nuts 11 is adopted, not only is fixation ensured, but even if the diameter of the wiring opening 13 or the thickness of the wiring box 12 differs depending on the specifications. , it also has the advantage of being able to respond adequately.

FIGS. 4 to 14 show a pipe joint for a corrugated flexible pipe that has been more concretely implemented at a practical level. This corrugated flexible pipe joint integrally includes an insertion ring 26, a hinge piece 27, and a pair of connecting pieces 28 and 29, as described above. A flexible tube insertion port 30 is formed in the center of the insertion ring 26.
A fitting groove 31 having an angled cross-section is formed in the upper inner circumferential portion of 6 . This fitting groove 31 has connection pieces 28 and 29.
Fitting protrusions 32 and 32 protruding from each end of both connecting pieces 2
8.29 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 retaining protrusion 34 has a triangular cross section and is formed into an arc shape when viewed from above.
9 are placed back to back on the inner periphery of one end of each connecting piece 28, 29. 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 circumferential groove 36, and also contacts each retaining protrusion 34. 34 is a stopper 35
．． 35 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 pipe 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 elastically deforming and the retaining protrusion 34 from slipping out from within the connection piece 28.29. One of them is provided with an inset 138.38 on the inner side of both circumferential ends thereof, and the other is provided with the inset groove 38.38.
Fitting protrusion 39.39 that fits into 38 through elastic deformation
is provided. The fitting protrusion 39 is adapted to fit tightly into the fitting groove 38. Each connection piece 2
At the axial end of 8.29, a half-split screw 40.40 is formed as a box connection.

Note that the insertion ring may have a shape other than circular.

〔Effect of the invention〕

A connecting piece consisting of two pieces each having at least a semi-cylindrical inner circumferential surface is attached to the outer periphery of the insertion ring which serves as a flexible tube insertion port, and is connected at the same end in the axial direction via a hinge piece. These connecting pieces are combined by bending at the hinge piece, and the internal space formed between them is used to insert a cylindrical tube into which the corrugated flexible tube inserted into the insertion ring is inserted. A cylindrical body with a hole, the outer periphery of the other end of the cylindrical body having a box connection part that is inserted into the wiring opening of the wiring box and fixed to the box, and at least one inner periphery of the cylindrical body. In the pipe joint for a corrugated flexible pipe, the pipe joint for a corrugated flexible pipe is provided with a retaining protrusion that fits into a groove on the outer circumferential surface of the flexible pipe inserted into the pipe insertion hole, and the box connection part of each of the connection pieces is connected to the wiring. It is characterized by having a half-split threaded part that is inserted into the wiring opening of the box and faces the inner periphery of the wiring box, into which the lock nand is fitted, making it easy to assemble. Not only can it be used to reduce costs, but it also has excellent fixing strength to the wiring box, and can always be easily and securely installed even if the opening diameter and board thickness of the wiring box are slightly different. In addition, it is difficult to create gaps between the connecting pieces, so it has a good appearance and can be applied to concrete embedding work.

[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 in FIG. 5, FIG. 11 is a right side view of FIG. 5, FIG. 12 is a sectional view taken along the line 2-2 in FIG. 14 is a detailed view of the hinge part, FIG. 15 shows a conventional pipe joint for a corrugated flexible pipe, and (a) shows the state in which the corrugated flexible pipe is inserted. (b) is a cross-sectional view showing the state before the corrugated flexible tube is inserted, FIG. 16 shows another conventional example, and fat in the same figure shows the corrugated flexible tube. FIG. 2B is a perspective view of the flexible tube joint in its unfolded state, FIG. 1B is a perspective view of the assembled state, and FIG. 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 10.40... Screw 11... Lock nut 12. ...Wiring box 13...Wiring opening
14...Hatsuke Flexible Pipe Agent Patent Attorney Takehiko Matsumoto I4 Figure s6 Figure

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. , the box connection portion of each of the connection pieces includes a half-split threaded portion that is inserted into the wiring opening of the wiring box and faces the inner circumference of the wiring box, and serves as a threaded portion into which a lock nut is fitted. A pipe joint for corrugated flexible pipes.