JPH071579Y2 - Connection structure between spiral tube and joint member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a spiral tube having elasticity and flexibility that is widely used, including a protective tube for electric wires and cables, and the like.
The present invention relates to a connection structure with a joint member connected to the end of this spiral tube.

(Prior Art) FIG. 4 shows a conventional connection structure between a spiral pipe and a joint member.

In this figure, the spiral tube a has a fitting portion c at one side edge, which is bifurcated and has stopper portions b, b provided opposite to each other at the inner edge of the opening end,
A belt-shaped synthetic resin profile e having a locking portion d slidably fitted and locked in the fitting portion c is spirally wound on the other side edge and is adjacent to each other in a wound state. The fitting part c and the locking part d that fit together are fitted together to form a tubular shape. And the spiral tube a which becomes like this
Can be expanded and contracted or bent by sliding the locking part d in the fitting part c in the axial direction of the pipe a. The pipe diameter can be freely changed by sliding in the direction.

On the other hand, the joint member h is tubular and has a connecting portion k at one end into which the spiral tube is inserted and connected, and the inner diameter of the connecting portion k is slightly larger than the outer diameter of the spiral tube a. In addition, the inner diameter is gradually increased toward the open end, and the abutting portion 1 that abuts the end of the spiral tube a is formed on the inner wall surface of the inner portion along the circumferential direction. It is a thing.

The connection between the spiral tube a and the joint member h as described above is performed by first filling the inner wall surface of the connecting portion k of the joint member h with the filling system bonding agent m in advance.
Is applied, and then one end of the spiral tube a is connected to the connection abutting portion l.
It is carried out by pushing it into the connecting portion k until it abuts and hardening the bonding agent m. The waterproof property between the spiral tube a and the joint member h is obtained by the bonding agent m.

(Problems to be Solved by the Invention) However, the above-described conventional connection structure has the following problems.

That is, on the outer peripheral surface of the spiral pipe a, there is a spiral groove n between the fitting portions c adjacent to each other regardless of the structural expansion / contraction state of the pipe a. n to reach the inside of the connecting portion k of the joint member h, and the spiral pipe a
There was a problem that it penetrated into the tube from the end of the.

(Means for Solving the Problem) The connection structure of the spiral pipe and the joint member according to the present invention has a fitting portion having a bifurcated shape at one side edge and a retaining portion opposite to the inner edge of the opening end. A strip-shaped synthetic resin profile having a locking portion slidably fitted and locked in the fitting portion on the other side edge is spirally wound and is adjacent to each other in the wound state. A connecting structure of a stretchable and flexible spiral tube formed by fitting a fitting portion and a locking portion into a tubular shape and a tubular joint member connected to an end of the spiral tube. In the spiral tube, at least one rib is provided on the outer wall surface of the fitting portion that is the outer peripheral surface of the tube so as to project along the longitudinal direction of the profile, while the joint member is
The spiral tube has a connecting portion into which the end portion is inserted, and a spiral concave groove that is screwed with the rib is formed on the inner peripheral surface of the connecting portion.
In addition, the pitch of the recessed groove is substantially equal to or slightly larger than the interval between the ribs when the spiral tube is contracted, and the connection portion of the joint member and the spiral tube thus formed are screwed together. While being joined, the gap between the fitting portions formed on the outer peripheral surface of the spiral pipe in the connection portion and the gap between the spiral pipe and the connection portion are filled with the bonding agent, and the end portion of the spiral pipe is connected to the joint member. It is connected and fixed in the connection part.

(Operation) The operation of the present invention will be described with reference to FIG. 1 showing an embodiment of the present invention.

While rotating the joint member 7 around its axis, its connecting portion 71
When the end portion of the spiral tube 1 is inserted into the inside, the rib 5 of the spiral tube 1 functions as a male screw and the groove 72 in the connecting portion 71 functions as a female screw. The groove 72 is screwed together. Then, the spiral tube 1 is screwed in until the end thereof abuts the abutting portion 73 of the innermost portion of the connecting portion 71, and the fitting portions 2 formed on the outer peripheral surface of the spiral tube 1 inside the connecting portion 71 are separated from each other. The gap 91 and the gap 92 between the spiral tube 1 and the connecting portion 71 are filled with the bonding agent 8,
As a result, the end of the spiral tube 1 is connected to the connecting portion 71 of the joint member 7.
Fixed inside the connection.

In the connecting portion between the spiral pipe 1 and the joint member 7 which are connected and fixed in this way, the gap 91 between the fitting portions 2 and the gap 92 between the spiral pipe 1 and the connecting portion 71 are filled with the bonding agent 8. Therefore, the waterproofness is perfect. Therefore,
As shown in FIG. 1, the spiral pipe 1 is connected to the connecting portion 71 of the joint member 7.
Is extended to the vicinity of the open end of the, and a relatively large groove 93 is formed between the adjacent fitting portions 2, so that groundwater or the like can be absorbed by the groove 93.
Even if the water is transmitted, the water is blocked by the bonding agent 8 in the connecting portion 71, and the water does not enter the spiral tube 1 around the tube end surface.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial sectional view showing a connection structure between a spiral tube 1 and a joint member 7 according to the present invention, and FIG. 2 is a spiral tube 1 according to the present invention.
FIG. 3 is a perspective view showing a synthetic resin profile 4 constituting the above, and FIG. 3 is a sectional view showing an example of a joint member.

The profile 4 has a fitting portion 2 at one side edge, which is bifurcated and has retaining portions 21, 21 paired at the inner edge of the opening end, and is slidable inside the fitting portion 2 at the other side edge. Locking part 3 to be fitted and locked in
In addition, a single rib 5 is provided on the outer wall surface 22 of the fitting portion 2 serving as the outer peripheral surface of the tube 1 so as to project along the longitudinal direction of the profile 4. Further, in the present example, of the two retaining portions 21, 21 of the fitting portion 2 of the profile 4 thus configured, the tip portion of the retaining portion 21 on the outer peripheral side of the pipe (opposite the other retaining portion 21). The elastic body 6 is provided over the entire length of the profile 4. As the material of the elastic body 6, a material having excellent compression set and heat aging resistance and having good compatibility with the material of the profile 4 is preferably used. For example, when the profile 4 is a hard vinyl chloride resin, the elastic body 6 is a soft vinyl chloride or vinyl chloride thermoplastic elastomer, and when the profile 4 is a polyethylene resin or a polypropylene resin, the elastic body 6 is an ethylene thermoplastic resin. A combination of a plastic elastomer or a polyethylene copolymer, and when the profile 4 is a polystyrene resin, a combination in which the elastic body 6 is a styrene-based thermoplastic elastomer can be mentioned. In this way, if the materials of the profile 4 and the elastic body 6 are selected so as to have a good compatibility with each other, there is almost no possibility that the elastic body 6 is easily peeled from the profile 4, and the elastic body 6 is peeled off. In order to prevent this, it is not necessary to process the profile 4 and the elastic body 6 into a specific shape (for example, a shape in which both can be fitted in concavity and convexity). The profile 4 and the elastic body 6 are formed by, for example, coextrusion using two extruders. In the example above,
The elastic body 6 is provided only on the retaining portion 21 on the outer peripheral side of the tube, but the elastic body 6 is not limited to this, and may be provided on both retaining portions 21, 21.

Similar to the conventional spiral tube, the profile 4 is spirally wound, and the fitting portion 2 and the locking portion 3 which are adjacent to each other in the wound state are fitted into each other to form a tubular shape. A spiral tube 1 having stretchability and flexibility is manufactured.

The shape of the profile 4 and the position where the elastic body 6 is provided are not limited to those in the above-described embodiment. Further, the number of ribs 5 may be two or more, and correspondingly, the number of grooves of the concave groove 72 described later may be two or more.

Next, the joint member 7 in the present invention will be described.

The joint member 7 has a connecting portion 71 into which the end of the spiral tube 1 is inserted, and an inner peripheral surface of the connecting portion 71 has a spiral groove groove that is screwed into the rib 5 of the spiral tube 1. 72 is formed, and the pitch of the concave groove 72 is the rib 5 when the spiral tube 1 is contracted.
The gap is substantially equal to or slightly larger than the gap. Incidentally, reference numeral 73 in the figure is a connecting portion.
It is an abutting portion provided in the inner part of 71 along the circumferential direction, and when the end surface of the spiral tube 1 abuts against the abutting portion 73, the insertion length of the spiral tube 1 into the connecting portion 71 is increased. Regulated.

The joint member 7 thus configured is preferably made of, for example, the same material as the profile 4, and is manufactured by, for example, injection molding or compression molding.

Then, when the end portion of the spiral tube 1 is inserted into the connecting portion 71 while rotating the joint member 7 around its axis, the rib 5 of the spiral tube 1 serves as a male screw and the inside of the connecting portion 71 is increased. Groove
72 functions as a female screw, and the rib 5 and the concave groove 72 of the connecting portion 71
And screw together. Then, the spiral tube 1 has a connecting portion 71 at its end.
It is screwed into the abutting part 73 at the innermost part of the part until it abuts. Due to the screwing of the two, the interval between the ribs 5 of the spiral tube 1 is set to the joint member 7
It is regulated by the pitch of the concave groove 72 of. Here, when the pitch of the concave grooves 72 is substantially equal to the interval between the ribs 5 when the spiral tube 1 is contracted, the interval between the ribs 5 is the interval when the spiral tube 1 is contracted most, and the adjacent fitting portions 2 are adjacent to each other. Are closely contacted with each other, but the degree of close contact between the fitting portions 2 is not so high in view of the dimensional accuracy of the profile 4, and a slight gap 91 is formed between the fitting portions 2 on the outer peripheral surface of the spiral tube 1. Occurs. Also, when the pitch of the concave grooves 72 of the connecting portion 71 is slightly larger than the distance between the ribs 5 when the spiral fitting 1 is contracted, a gap 91 is naturally formed on the outer peripheral surface of the spiral tube 1. Thus, the connection part
In the gap 71 between the fitting portions 2 formed in the outer peripheral surface of the spiral tube 1 inside 71, and the gap 92 between the spiral tube 1 and the connecting portion 71, the bonding agent 8 is formed.
Is filled, and thereby the end of the spiral tube 1 is connected and fixed in the connecting portion 71 of the joint member 7.

As the above-mentioned bonding agent 8, the gap 91 between the fitting portions 2 and the gap 92 between the spiral tube 1 and the connecting portion 71 can be completely filled so that the gap between the fitting portions 2 is very narrow. A low-viscosity filling adhesive having excellent fluidity and filling properties is preferably used, and an example thereof is a non-mixing type two-component acrylic adhesive. When using this non-mixing type two-liquid acrylic adhesive, first, the low-viscosity liquid is applied to the outer peripheral surface of the end portion of the spiral tube 1 and the inner peripheral surface of the bonding portion 71 of the joint member 7, respectively. Then, the low-viscosity liquid fits even when the degree of close contact between the fitting portions 2 is relatively high (when the pitch of the concave grooves 72 is substantially equal to the interval between the ribs 5 when the spiral tube 1 is contracted). It easily penetrates into the gap 91 between the joining portions 2, and the gap 91 is filled with the low-viscosity liquid. Subsequently, the high-viscosity liquid is applied over the outer peripheral surface of the end portion of the spiral tube 1 and then the spiral tube 1 and the joint member 7 are screwed together as described above, thereby completing the connection and fixing of the both.

Spiral tube 1 and joint member 7 connected and fixed as described above
In the connection portion with the both, the gap 91 between the fitting portions 2 and the gap 92 between the spiral tube 1 and the connection portion 71 are both filled with the bonding agent 8, so that the waterproofness is complete. Therefore,
As shown in FIG. 1, the spiral pipe 1 is connected to the connecting portion 71 of the joint member 7.
Is extended to the vicinity of the open end of the, and a relatively large groove 93 is formed between the adjacent fitting portions 2, so that groundwater or the like can be absorbed by the groove 93.
Even if the water is transmitted, the water is blocked by the bonding agent 8 in the connecting portion 71, and the water does not enter the spiral tube 1 around the tube end surface. In addition, the retaining portion 21 of the fitting portion 1
If the elastic body 6 is provided in the fitting member 1, it is possible to prevent groundwater or the like from infiltrating into the fitting portion 1 over the entire length of the spiral pipe 1, and the groundwater or the like travels inside the fitting portion 1 and This is preferable because it can be prevented from entering the spiral pipe 1 by turning around the pipe end face, but it is not always necessary to stop the groundwater or the like that spirally propagates through the groove 93.

(Effect of the Invention) According to the connection structure of the spiral pipe and the joint member of the present invention, water such as ground water travels through the groove between the adjacent fitting portions and spirals inside the joint member as in the conventional case. There is no way to enter the pipe via the end face of the pipe. Therefore, it is possible to safely protect the electric wire, the cable and the like inserted in the spiral tube.

Further, since the spiral pipe and the joint member are connected by the screwing means and the bonding agent, the pulling strength of the spiral pipe with respect to the joint member is improved, and the spiral pipe can be prevented from coming off.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of a connecting structure between a spiral pipe and a joint member according to the present invention, and FIG. 2 is a perspective view showing an embodiment of a synthetic resin profile constituting the spiral pipe according to the present invention. FIG. 3 is a sectional view showing an embodiment of a joint member according to the present invention, and FIG. 4 is a partial sectional view showing a conventional connecting structure between a spiral pipe and a joint member. DESCRIPTION OF SYMBOLS 1 ... Spiral tube 2 ... Fitting part 21 ... Stoppage part, 22 ... Outer wall surface 3 ... Locking part 4 ... Profile, 5 ... Rib 6 ... Elastic body 7 ... Joint member 71 ... Connection part, 72 ... Recessed groove

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI technical display location H02G 3/06 M 9175-5G (72) Inventor Politics 2 27-31 Shinryo, Otsu City, Shiga Prefecture No. (56) Reference Japanese Unexamined Patent Publication No. 49-46216 (JP, A) Actually opened 59-81876 (JP, U) Actually opened 57-174881 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A one-sided edge has a fitting portion which is bifurcated and in which an inner edge of the opening end is provided with a stopper portion, and the other side edge is slidably fitted and locked in the fitting portion. A strip-shaped synthetic resin profile having a locking portion is spirally wound, and the fitting portion and the locking portion adjacent to each other in the wound state are fitted into each other to form a tubular shape. A connection structure of a spiral tube having elasticity and flexibility and a tubular joint member connected to an end of the spiral tube, wherein the spiral tube is an outer peripheral surface of the tube. At least one rib is provided on the outer wall surface of the projection along the longitudinal direction of the profile, while the joint member has a connection portion into which the end of the spiral tube is inserted. A spiral concave groove that is screwed with the rib is formed on the peripheral surface, and the pitch of the concave groove is set when the spiral tube is contracted. The distance between the ribs is substantially equal to or slightly larger than the distance between the ribs, and the connection portion of the joint member and the spiral tube thus formed are screwed together, and the outer peripheral surface of the spiral tube is formed in the connection portion. A spiral pipe characterized in that a gap is formed between fitting parts and a gap between the spiral pipe and the connecting part is filled with a bonding agent, and an end of the spiral pipe is connected and fixed in the connecting part of the joint member. Connection structure with joint members.