JPH0218394Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a joint for connecting pipes whose outer circumferential walls are formed in an annular or spiral waveform, such as electric wire protection pipes.

[Conventional technology]

The main type of joints that have existed in the past have been of the type in which, for example, a cap nut-like member with a portion that engages with the valley of a corrugated pipe is screwed to the joint body; Not only do they have a large number of parts and complex structures, but they also have
The manufacturing cost is high, and in addition, there are disadvantages in that it requires a great deal of effort to assemble the parts when connecting them.

[The problem that the idea aims to solve]

The present invention is an attempt to solve the above-mentioned conventional drawbacks, and is simple and easy to construct and manufacture using a single component.Moreover, it is possible to connect corrugated pipes in a secure and strong retaining state with one-touch operation. To provide a flexible joint for corrugated pipes that can perform a good connection regardless of the slight difference in the pipe diameters even when the pipe diameters of the corrugated pipes to be connected are slightly different.

[Means to solve the problem]

In order to achieve the above object, the joint for a corrugated pipe according to the present invention has a cylindrical body having a cylindrical holder that fits externally on the corrugated pipe, at least on one axial end side of the cylindrical body, which is larger than the inner diameter of the cylindrical holder. A large-diameter portion having a large inner diameter is formed, and a protrusion is provided at the outer end of the large-diameter portion via a hinge portion so as to be spaced apart from the end wall of the large-diameter portion of the cylindrical body toward the outside of the cylinder in a free state. a plurality of protrusions that can be freely oscillated between a first posture and a second posture that is in the cylinder of the large diameter portion and are transformed into a folded posture close to the inner circumferential wall of the large diameter portion; , which are integrally connected to the large diameter part and arranged at approximately equal intervals in the circumferential direction of the large diameter part, and connected to the most extreme part of the protruding piece in the second attitude. An engaging protrusion for preventing the pipe from coming off is integrally protruded and engages with the trough of the corrugated pipe by elastic force. A space portion is provided on the inner circumferential surface side of the large diameter portion on the radially outward side of the inner circumferential surface of the portion, in which the entire protrusion including the engagement protrusion for preventing the detachment can be stored. It has a characteristic configuration, which has led to the following actions and effects.

[Operation] That is, when the corrugated pipe is pushed toward the large diameter portion of the cylindrical body in the above-mentioned first position, the protruding piece in the position protruding toward the outside of the cylinder is pushed by the end face of the pipe, and the hinge portion is pushed. The pipe swings as if being folded back around the cylindrical body, is displaced to the outside of the outer circumferential surface of the pipe within the large diameter portion of the cylindrical body, and is switched to a second position in which it is located close to the inner surface of the large diameter portion, and the pipe is moved into the cylindrical body. When the corrugated pipe is inserted into the main body by a specified amount, the engagement protrusion at the tip of the protrusion for preventing the protrusion from coming off becomes elastically engaged with the trough of the corrugated pipe.

If a pulling force is applied to the corrugated pipe after the engaging protrusion has once engaged with the trough of the corrugated pipe, the engaging protrusion completely engages with the trough of the pipe, and The protrusion acts as a tension member, and the greater the pulling force of the corrugated pipe, the stronger the force acting on the protrusion toward the shaft core, and the more strongly the engagement protrusion engages the trough of the corrugated pipe. This will increase the force that prevents the pipe from being pulled out.

Further, there are a plurality of protruding pieces, which are distributed at approximately equal intervals in the circumferential direction of the large diameter part, and each of the protruding pieces protrudes from the end of the large diameter part toward the outside of the cylinder in a free state. Since the pipe is folded into the large diameter part from that position through the hinge part, the insertion pipe can be smoothly introduced into the cylindrical holding part while being guided so that the central axes are aligned. Easy to do.

Furthermore, the protruding piece that is deformed into the folded state via the hinge part has a large amount of deformation from the original free state, and therefore the biasing action in the backward direction is also applied over a wide range in the radial direction of the large diameter part. It is relatively strong and easy to work with little change in biasing force.

Furthermore, the locking engagement protrusion is provided at the most distal end of the protrusion, and
The entire projecting piece, including this engaging projection, is configured to be retractable on the radially outward side of the inner circumferential surface of the cylindrical holding part and on the inner circumferential side of the large diameter part, so that the corrugated pipe Even if the amount of protrusion of the engaging protrusion is increased to ensure reliable engagement with the trough, the corrugated pipe can be easily inserted. Since it is constructed in this way, when the engaging protrusion of the protruding piece is engaged with the trough of the corrugated pipe, the protruding piece must be located parallel to the outer surface of the corrugated pipe. Rather, the engagement protrusion reliably engages with the trough of the pipe in an attitude inclined with respect to the outer surface of the pipe.

[Effect of idea]

(b) From the above effects, since the whole is a single component such as the cylindrical body with the rocking protrusions connected to it, the structure is simple, easy to manufacture, and inexpensive, and in addition, the corrugated pipe When connecting, all you need is one-touch operation such as insertion in one direction.
It requires no assembly effort at all and can be connected very easily and efficiently.

(b) However, from the effect of ~ above, after insertion,
This has resulted in the remarkable effect of being able to securely and strongly prevent the connection from slipping out.

(c) Also, due to the effect described above, even if the inclination angle of the protruding piece is slightly changed due to a change in the diameter of the pipe, the state of engagement of the engaging protrusion with the trough of the corrugated pipe is likely to be maintained. , corrugated pipes with a somewhat small diameter, and corrugated pipes with varying diameters can be reliably connected, and are excellent in terms of versatility.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

In Fig. 1, reference numeral 1 indicates a type of joint that has a threaded portion 7 for connecting to necessary equipment, etc. at one end in the axial direction (left side in the figure), and a connecting portion for a corrugated pipe 8, which will be described later, at the other end. This cylindrical body 1 has a corrugated pipe 8 deep inside.
A cylindrical holding part 1A is formed to fit onto the outside of the corrugated pipe to hold it, and the inner surface of the end on the corrugated pipe connecting part side is formed into a large diameter part 2 over the entire circumference, and this large diameter part Projecting pieces 4 are integrally protruded from two locations in the circumferential direction at the outer end of the housing 2 via hinge portions 3 which are formed to have extremely thin walls and are bendable. These protrusions 4 have a first posture in which their tips are inclined toward the axis outside the axial direction of the cylindrical body 1, as shown by solid lines in FIG. 1, and a first posture as shown by imaginary lines in FIG. , and are configured to be freely displaceable by swinging around the hinge portion 3 into a second position in which they enter into the large diameter portion 2 and their tips are inclined toward the axis.

Furthermore, an engaging protrusion 5 is integrally formed on the outer surface of the tip end of the protruding piece 4 to protrude and engage with the trough 9 of the corrugated pipe 8 in the second attitude. The protrusion 4 including the engagement protrusion 5 and the cylindrical body 1 are made of polypropylene, polyethylene,
It is integrally molded from a flexible synthetic resin material such as vinyl chloride. Then, the large diameter portion 2
has a space S in which the entire protrusion 4 including the engagement protrusion 5 can be stored, on the inner circumferential side thereof, on the radially outward side of the inner circumferential surface of the cylindrical holding portion 1A. It has a large diameter. The corrugated pipe 8 has an outer peripheral wall surface formed into an annular or spiral wave shape by blow molding or caterpillar molding.
In the figure, reference numeral 6 denotes a stopper for positioning the corrugated pipe 8, which is integrally formed on the inner circumferential surface of the cylindrical body 1 to protrude. Further, as clearly shown in FIG. 2, the engagement protrusion 5 has a steep angle close to a right angle with the protrusion 4 on its tip side, and when engaged with the trough 9 of the corrugated pipe 8, A contact surface 5 configured of a surface substantially perpendicular to the axis of the corrugated pipe 8 so as to come into contact with the side surface of the part 10
It is equipped with a. The protrusion piece 4 is formed with a gentle slope at its base side, and each of the protrusion pieces 4
is formed in the shape of a disc spring having a width around the axis of the cylindrical main body 1, and is configured to resist the pull-out force in the connected state by buckling.

Next, to explain how to connect the corrugated pipes 8 using the joint with the above configuration, the corrugated pipes 8
When the pipe is moved in the direction of the straight arrow a in FIG. Around the hinge part 3, the arcuate arrow 6 in Fig. 1
direction and switches to the second posture shown by the chain line. Then, the protruding piece 4 repeatedly swings between the solid line state and the virtual line state shown in FIG. 2 until the insertion side end surface of the corrugated pipe 8 comes into contact with the stopper 6. If the engagement protrusion 5 at the tip matches the trough 9 of the pipe 8 at the final insertion position in contact with the pipe 8, as shown by the solid line, the engagement protrusion 5 will engage with the trough 9, and the engagement protrusion 5 will When it matches the peak, it engages with the trough 9 at the next position on the back side, and the subsequent movement of the pipe 8 from coming off is prevented by the buckling strength of the protruding piece 4.

Other examples will be listed below.

[] FIG. 3 shows four projecting pieces 4 arranged in a row at approximately equal intervals in the circumferential direction, and FIG. 4 shows a case in which three projecting pieces 4 are arranged in a row at substantially equal intervals. In these cases, the pipe can be stably and reliably prevented from coming off in the connected state, but the number of protrusions 4 may be at least one.

[] The large diameter portion 2 is not limited to the one formed to have a large diameter over the entire circumference of the cylindrical main body 1.
As shown in the figure, only the portions necessary for the swinging displacement of the protruding piece 4 into the cylindrical body 1 may be partially enlarged in diameter.

[] The corrugated pipes to be connected can be rectangular corrugated ones as shown in Figures 1 and 2, as long as the outer peripheral wall surface is corrugated, such as arcuate corrugations or triangular corrugations. It can be applied to anything.

[ ] FIG. 5 shows an example of application to a type of joint in which corrugated pipes 8 are connected to both ends of the cylindrical body 1 in the axial direction.

[] The protrusion direction of the protruding piece 4 when the pipe is not inserted is as follows:
In addition to the posture shown in the above embodiment, it may also be in a posture protruding in a direction parallel to the cylindrical body 1, as shown in FIG. , bend it slightly inward in the radial direction with your fingers until it touches the tip of the pipe,
Then just insert the pipe.

[] Although not shown, when an external force of a certain amount or more is applied between the pipe 8 and the cylindrical body 1 in the connected state, the projecting piece 4 is swung into the first position due to buckling. If the joint is constructed in such a way that it can be disconnected from the pipe 8 without damaging the joint, the joint can be reused.

[Brief explanation of the drawing]

The drawings show embodiments of the joint for corrugated pipes according to the present invention, and FIG. 1 is a central vertical sectional side view, FIG. 2 is an enlarged longitudinal sectional side view of the main part of FIG. 1, and FIG. 3 is a different embodiment. FIG. 3 and FIG. 4 are side views, respectively, and FIGS. 5 and 6 are side views in longitudinal section at the center. 1... Cylindrical main body, 1A... Cylindrical holding part, 2...
Large diameter part, 3... Hinge part, 4... Protruding piece, 5... Engaging protrusion, 5a... Contact surface, 8... Corrugated pipe,
9...Tanibe, 10...Yamabe.

Claims (1)

[Claims for Utility Model Registration] 1. A cylindrical main body 1 provided with a cylindrical holding portion 1A that fits onto the corrugated pipe 8 has an inner diameter larger than the inner diameter of the cylindrical holding portion 1A at least at one end in the axial direction. A large diameter portion 2 is formed at the outer end of the large diameter portion 2, and a protrusion that is separated from the end of the large diameter portion 2 of the cylindrical body 1 toward the outside of the cylinder in a free state is provided at the outer end of the large diameter portion 2 via a hinge portion 3. the first posture, and the large diameter portion 2
A plurality of protrusions 4 are arranged in the circumferential direction of the large-diameter portion 2 and are movable in a second position in a folded-in position close to the inner circumferential wall of the large-diameter portion 2 in the cylinder. , are integrally connected to the large-diameter portion 2 in a state where they are arranged at approximately equal intervals, and the trough portions 9 of the corrugated pipe 8 to be connected in the second attitude are provided at the tip end of the protruding piece 4. An engagement protrusion 5 for preventing slipping is integrally provided on the inner circumferential side of the large diameter portion 2, and the inner circumference of the cylindrical holding portion 1A is provided on the inner circumferential side of the large diameter portion 2. A space S is provided on the inner peripheral surface side of the large diameter portion 2 on the radially outward side of the surface, in which the entire protrusion 4 including the engagement protrusion 5 for preventing slippage can be stored. Joint for corrugated pipe. 2. The joint for a corrugated pipe according to claim 1, wherein the cylindrical main body 1 and the protruding piece 4 are integrally molded from a synthetic resin material. 3 When the projecting piece 4 is in the second attitude and the engaging protrusion 5 is engaged with the trough 9 of the corrugated pipe 8, an external pulling force of a certain level or more is applied between the pipe 8 and the cylindrical body 1. The joint for a corrugated pipe according to claim 1 or 2, which is configured to be able to swing to the first position by buckling when the joint is bent. 4. A utility model according to any one of claims 1 to 3, wherein the protruding piece 4 is configured in the shape of a disc spring having a width around the axis of the cylindrical body 1. Joint for corrugated pipe. 5 The engagement protrusion 5 is located at the trough 9 of the corrugated pipe 8.
When the corrugated pipe 8 is engaged with the crest 10 of the corrugated pipe 8,
Any one of claims 1 to 4 of the claims 1 to 4, which is a utility model, is provided with a contact surface 5a formed of a surface substantially perpendicular to the axis of the corrugated pipe 8 so as to contact the side surface of the corrugated pipe 8. Joint for corrugated pipes as described in section.