JP3063114U - Conduit fitting - Google Patents

Abstract

(57) [Problem] To provide a simple conduit fitting which does not require much cost and trouble when attaching a member having a waterproof function to a conduit fitting main body. SOLUTION: A hollow cylindrical conduit fitting body 1 into which a conduit is inserted is provided with a flange-shaped protrusion 2 having an inclined surface 3 at an end thereof, and the inside thereof is provided with a stepped portion 4 through the electric wire. The first inner diameter portion 1a is substantially equal to the outer diameter of the tube, and the second inner diameter portion 1b is larger than the outer diameter of the conduit tube. The conduit fitting body 1
The bushing member 10 made of a synthetic resin material having high elasticity which is fitted to the end of the main body and seals the liquid with the electric wire tube is engaged with the back surface of the flange-shaped protrusion 2 of the electric wire joint body 1. A box-shaped annular head 11 having a locking portion 13 formed therein, and an elastic tubular portion 12 having a reduced diameter portion smaller than the conduit tube connected to the box-shaped annular head 11 are integrally formed, When the bushing member 10 is mounted, an appropriate space 14 is formed between the free end of the elastic tubular portion 12 and the step portion 4.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The invention relates to conduit fittings such as steel threaded conduit couplings, box connectors or metal flexible conduit connectors.

[0002]

[Prior art]

 As an example of a conduit fitting, a steel threadless conduit coupling will be described. Usually, a hollow cylindrical conduit fitting body into which a conduit is inserted and a body of the conduit fitting body are screwed. The conduit fitting comprises a plurality of push bolts, a ground nut screwed to an end of the conduit fitting body, and a sealing ring disposed between the conduit fitting body and the ground nut. After the conduit is inserted into the main body, the conduit is pressed and fixed with a push bolt, and the gland nut is screwed in to hold down the sealing ring against the outer peripheral surface of the conduit to prevent water from entering from outside.

[0003] The structure in which the gland nut is screwed as described above is not very desirable in terms of work efficiency. Therefore, as disclosed in, for example, Japanese Utility Model Laid-Open No. 1-90224, an elastic ring having a lip protruding from the inner surface is bonded to both ends of the conduit fitting main body, and a conduit is provided inside the elastic ring. It has been proposed that the lip presses the outer peripheral surface of the conduit by inserting the lip, thereby blocking water from entering.

[0004]

[Problems to be solved by the invention]

 In the above-described configuration in which the elastic rings are bonded to both ends of the conduit fitting main body, the screwing work of the ground nut can be omitted and the waterproof effect can be obtained by inserting the conduit, but the elastic rings must be bonded. There is still room for improvement in terms of cost and effort. The present invention has been made in view of the above circumstances, and provides a simple conduit fitting which does not require much trouble and cost when mounting a member exhibiting a waterproof function to the conduit fitting body.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, a conduit joint according to the present invention has a hollow cylindrical conduit joint body into which a conduit is inserted and an end portion of the conduit joint body. A bushing member made of a resilient synthetic resin material which is fitted to perform liquid sealing between the conduit and the conduit joint body, wherein the end of the conduit joint body is an outer end; A flange-shaped protrusion having an inclined upper end is formed on the inner side of the conduit fitting body. The first inner diameter portion is substantially equal to the outer diameter of the conduit, and the second inner diameter is larger than the outer diameter of the conduit. The bushing member is divided into two inner diameter portions via a step portion, and the bushing member has a locking portion formed with a locking portion capable of locking to the back surface of the flange-shaped protrusion of the wire fitting body. The head and the elastic tubular part connected to the box-shaped annular head and having a smaller diameter part than the conduit above are integrated Made is, in the mounted state of the bushing member, are a configuration to form an appropriate gap between the free end and the front Kidan portion of the elastic tubular portion.

Further, as in claim 2, the bushing member has a box-shaped annular head and an elastic cylinder portion each formed by a known two-color injection molding method using different synthetic resin materials. It can be configured as a product.

[0007]

[Embodiment of the invention]

 FIG. 1 shows an embodiment of the present invention. 1 is a hollow cylindrical conduit fitting body into which a conduit is inserted. At the end of the conduit fitting main body 1, a flange-shaped protrusion 2 having an inclined upper surface 3 at an outer upper end portion is formed. Steps 4, 4 are formed at two places on the inner surface of the conduit fitting body 1, a first inner diameter portion 1 a between the steps 4, 4, and a fourth step extending from the step 4 to the end of the conduit fitting body 1. It is divided into two inner diameter portions 1b. The first inner diameter portion 1a is substantially equal to the outer diameter of a conduit (not shown) to be inserted, and the second inner diameter portion 1b is made larger than the outer diameter of the conduit. A screw hole 6 provided in the body portion 5 of the conduit fitting body 1 is adapted to screw a push bolt (not shown) for pressing and fixing the conduit tube.

A bushing member 10 made of a synthetic resin material having high elasticity is provided with a box-shaped annular head 11 having a locking portion 13 which can be locked to the back surface of the flange-shaped protrusion of the conduit fitting main body. An elastic tubular portion 12 having a reduced diameter portion smaller than the above-mentioned conduit tube is integrally formed with the box-shaped annular head 11.

The bushing member 10 is pushed into the end of the conduit fitting main body 1 as shown by an arrow in FIG. 1 so that the locking portion 13 of the box-shaped annular head 11 comes into contact with the inclined surface 3 of the flange-shaped protrusion 2. If it is pressed in after contacting and abutting, the box-shaped annular head 11 bends obliquely upward and deforms, and the locking portion 13 rises on the inclined surface 3, and finally, a point in FIG. As shown by the chain line, the bushing member 10 is engaged with and engaged with the back surface of the flange-shaped protrusion 2, and the flange-shaped protrusion 2 is surrounded by the box-shaped annular head 11 of the bushing member 10. Complete.

As described above, when the bushing member 10 is mounted, an appropriate space 14 is formed between the free end of the elastic tubular portion 12 and the step portion 4. The presence of the space 14 allows the elastic tubular portion 12 to be displaced in the longitudinal direction when a conduit is inserted inside the elastic tubular portion 12 of the waterproof bushing 10 and the reduced diameter portion of the elastic tubular portion 12 is enlarged. Therefore, the above-described diameter-expanding action is not hindered. In addition, the outer surface of the conduit inserted into the elastic tubular portion 12 is repressed by the repulsive elastic force of the deformed elastic tubular portion 12, so that no water enters from outside.

Regardless of whether the above-mentioned bushing member 10 is attached by the box-shaped annular head 11 or the waterproof effect of the elastic tubular portion 12 of the bushing member 10, both of them depend on the properties of the synthetic resin material having high elasticity. It is important to select appropriate materials. The bushing member 10 may be formed of one kind of synthetic resin material, but the elastic cylindrical portion 12 for pressing the outer surface of the conduit to prevent water from entering is more flexible than the box-shaped annular head 11. Rich people are preferred. Therefore, the box-shaped annular head 11 is made of a hard synthetic resin such as polypropylene, and the elastic cylinder 12 is made of a known two synthetic resin material such as a soft synthetic resin such as an olefin-based thermoplastic elastomer. It is preferable to use one obtained as an integral molded product by the two-color injection molding method.

Although the elastic cylindrical portion 12 shown in FIG. 1 has a shape in which a relatively linear portion is long, the elastic cylindrical portion 12 may have two peaks as shown in FIG. 2 or a single peak as shown in FIG. In any case, the free end of the elastic tubular portion 12 has a curved shape that allows passage of the conduit fed from the opposite direction. On the other hand, in the examples of FIGS. 4 to 6, the conduit pipe sent from the opposite direction is locked and cannot pass. This is because, in the example of FIG. 4, the pipe stop 7 that is not provided in the example of FIG. 1 is formed on the inner surface of the conduit fitting main body 1, so that the pipe from the opposite direction is allowed to pass therethrough. No ingenuity is needed.

[0013]

[Effect of the invention]

 In the conduit joint of the present invention, the end of the conduit joint body has a flange-shaped protrusion with an inclined upper outer end portion, and the bushing member is a flange-shaped part of the conduit joint body. Since there is a box-shaped annular head formed with a locking portion that can be locked on the back surface of the protruding portion, the bushing member can be mounted only by pushing the bushing member into the end of the conduit fitting main body. In addition, since the bushing member is mounted and an appropriate distance is formed between the free end of the elastic tubular portion of the bushing member and the stepped portion, the wire tube is inserted into the bushing member and the wire tube is inserted into the bushing member. As a result of appropriate deformation when passing through the reduced diameter portion of the small-diameter bushing member, insertion is easily and reliably performed, and a liquid sealing effect is obtained. In other words, it will be a simple conduit fitting that requires as little effort and cost as possible.

[0014] In the bushing member, the box-shaped annular head and the elastic cylindrical portion may be integrally molded by a known two-color injection molding method using different synthetic resin materials. Then, it is possible to select an appropriate material suitable for each part, and mounting by the box-shaped annular head and blocking of intruding water by the elastic cylindrical portion can be more reliably and easily achieved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a conduit fitting according to the present invention.

FIG. 2 is a sectional view of a bushing member that can be used for the conduit fitting main body of FIG. 1;

FIG. 3 is a sectional view of a bushing member that can be used for the conduit fitting main body of FIG. 1;

FIG. 4 is a sectional view of the conduit fitting according to the present invention, which is different from FIG. 1;

FIG. 5 is a sectional view of a bushing member that can be used for the conduit fitting main body of FIG. 4;

FIG. 6 is a sectional view of a bushing member that can be used for the conduit fitting main body of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conduit main body 1a 1st inside diameter part 1b 2nd inside diameter part 2 Flange-shaped protrusion part 3 Inclined surface 4 Step part 7 Pipe stop 10 Bushing member 11 Box-shaped annular head 12 Elastic cylinder part 13 Engagement of box-shaped annular head Stopping 14 intervals

Claims (2)

[Utility model registration claims] A hollow cylindrical conduit fitting body into which a conduit is inserted, and a liquid seal between the conduit and the conduit joint body which is fitted to an end of the conduit joint body. A conduit fitting comprising a bushing member made of a synthetic resin material rich in elasticity, wherein the end of the conduit fitting body has a flange-shaped protrusion having an inclined upper end at an outer upper end portion. The inside is
The bushing member is divided into a first inner diameter portion substantially equal to the outer diameter of the electric conduit and a second inner diameter portion larger than the outer diameter of the electric conduit through a step. A box-shaped annular head having a locking portion that can be locked to the back of the flange-shaped protrusion of the joint body, and an elasticity having a reduced diameter portion smaller than the conduit tube connected to the box-shaped annular head. A conduit joint, wherein a tubular portion is integrally formed, and an appropriate space is formed between a free end of the elastic tubular portion and the step portion when the bushing member is mounted. 2. The bushing member is an integrally molded product obtained by a known two-color injection molding method using a box-shaped annular head and an elastic tubular portion using different synthetic resin materials. Item 2. The conduit fitting according to Item 1.