JPH1051924A - Tube joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability of tube joint fitting work at the time of fitting a tube joint to a box main body and reduce the cost of the tube joint by reducing the number of parts. SOLUTION: A large-diameter pipe section 11 into which tubes are integrally inserted is provided on one side of a tube joint main body 10 and, at the same time, a small- diameter pipe section 12 which is inserted into the hole 5a of a box main body 5 is provided on the other side of the main body 10 and a contacting surface section 13 which is engaged with the peripheral edge section of the hole 5a is provided between the sections 11 and 12. Checking claw sections 31 and 32 which are protruded toward the section 13 are provided on the outer peripheral surface of the section 12 so that the claw sections 31 and 32 can be folded in claw grooves 33 and 34. The sections 31 and 32 elastically expand on the opposite side of the hole 5a after passing through the hole 5a when the section 12 is inserted into the hole 5a. Therefore, when the narrow-diameter section 12 is inserted into the hole 5a, the joint main body 10 can be fixed to the box main body 5 through one action, because the main body 5 is held between the contacting surface section 13 of the main body 10 and the front ends of the claw sections 31 and 32 which expand after passing through the hole 5a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint used for connecting a pipe such as a wiring protection pipe to a box body such as a wall outlet box and a ceiling concrete box.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional pipe joint. This is used in a wiring outlet box embedded in a wall on which concrete is cast, and by screwing one of the threaded portions 1a of the joint body 1 and the metal fitting holding body 2 therebetween, And the distal end of the flexible wiring protection tube 4 is connected to the joint body 1 through the opening of the fitting holding ring 2.
Once the wire protection tube 4 is fitted, the distal end of the tube locking claw 3 engages with the valley groove 4a formed on the outer peripheral surface of the wire protection tube 4, and the wire protection tube 4 does not come off.

[0003] The other threaded portion 1b of the joint body 1 integrated with the tip of the wiring protection tube 4 in this way is inserted into the inside of the box main body 5 through an insertion hole 5a formed in the box main body 5. Then, the nut 6 is screwed and fixed to the screwing portion 1b of the joint body 1. The opening of the joint body 1 is closed by the cap 7 until wiring work is performed.

[0004]

This conventional pipe joint is
The manual work of screwing the nut 6 inside the narrow box body 5 is not easy, and it takes time to perform this work especially with the hands wearing working gloves. The work involves considerable difficulty and impairs the workability.

[0005] Further, this conventional pipe joint includes a joint body 1,
The number of parts is large, including the metal fitting holding body 2, the pipe locking claw metal fittings 3 and the nut 6, and further, the threaded portions 1a,
Since there is 1b, there is also a problem in terms of manufacturing cost such as the formation of the screw groove is not easy and an expensive mold is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and improves the workability of mounting a pipe joint to a box body, reduces the number of parts of the pipe joint, eliminates screw grooves, and reduces cost. The purpose is to do so.

[0007]

According to a first aspect of the present invention, there is provided a pipe joint for connecting a pipe to a box body, the pipe joint having one tubular portion for integrally fitting the pipe, and being bored in the box body. A joint body having the other cylindrical portion fitted into the inserted insertion hole, and a contact surface portion provided on the joint body and engaged with a peripheral portion of the insertion hole when fitted into the insertion hole of the box body; A pipe joint having a check claw portion formed in a direction facing the contact surface portion from the outer peripheral surface of the joint body and elastically expanding on the opposite side through the insertion hole of the box body when fitted to the box body; It is.

By simply inserting the other cylindrical portion of the joint main body into the insertion hole of the box main body, the joint main body is formed by the contact surface portion of the joint main body and the check claw that expands after passing through the insertion hole. Can be fixed to the box body with one touch.

According to a second aspect of the present invention, in the pipe joint according to the first aspect, a plurality of check claws corresponding to a plurality of plate thicknesses of the box body are provided at different intervals with respect to the contact surface. It is provided.

When the joint body is inserted into the insertion hole of the relatively thin box body, the check pawl for the thick plate is expanded at the side opposite to the insertion hole, and then the check pawl for the thin plate is opened. Similarly, the joint main body is fitted and fixed to the box main body by the one-touch operation by the check pawl portion for the thin plate and the contact surface portion. When the joint body is inserted into the insertion hole of the relatively thick box body, the check pawl for the thick plate is expanded on the side opposite to the insertion hole, and the check pawl for the thick plate is brought into contact with the check pawl. The joint body is fitted and fixed to the box body with one touch by the surface portion. At this time, the non-return claw portion for the thin plate is fitted in a closed state in the insertion hole of the box body.

According to a third aspect of the present invention, in the pipe joint according to the first aspect, the movable piece that can bend inward and outward in the joint body is formed by the notch and the notch formed in the joint body. Formed on the inner surface on the tip side of this movable piece,
A pipe locking claw for projecting the pipe in the pipe insertion direction and locking the pipe in the opposite direction is provided.

When the pipe is pushed and inserted into the joint main body, the movable piece once bends outward so as to escape, and then the tip of the pipe locking claw engages with the valley groove of the pipe, thereby connecting the pipe. It cannot be pulled in the opposite direction.

According to a fourth aspect of the present invention, in the pipe joint according to the third aspect, the distal end of the elongated tool is engaged with the distal end of the movable piece on the outer surface of the movable piece. Are formed integrally with each other, and at the base end side of the movable piece portion, a convex portion serving as a rotation fulcrum of the tool is integrally formed.

When it is necessary to pull out the pipe from the joint main body, the tip of the tool is inserted into the hook-like portion, and the tool is levered with the convex portion as a fulcrum to move the tool up to the hook-like portion. When given, the distal end side of the movable piece rotates to open outward, and the pipe locking claw is disengaged from the valley groove of the pipe, so that the pipe can be pulled out of the joint body.

According to a fifth aspect of the present invention, in the pipe joint according to the first aspect, an intermediate member is sandwiched between the inner surface of the box body and the check claw portion. Can also be used for larger diameter insertion holes.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIGS.

FIGS. 1 and 2 show a pipe joint mounted to a box body 5 such as a wall outlet box.
With this pipe joint, a flexible synthetic resin wiring protection tube (so-called CD tube, PF tube, etc.) 4 shown in FIG.
Connect.

In this pipe joint, a cylindrical joint body 10 is formed of a synthetic resin as shown in FIG. The joint body 10 has a large-diameter cylindrical portion 11 as one cylindrical portion formed into a large diameter, and a small-diameter cylindrical portion as the other cylindrical portion formed into a small diameter.
12 and has.

A flange-shaped contact surface portion 13 is integrally provided between the large-diameter tube portion 11 and the small-diameter tube portion 12 so as to fit into the insertion hole 5 a formed in the box body 5. At the time of wearing, the contact surface portion 13 is engaged with the peripheral edge portion of the insertion hole 5a.

As shown in FIGS. 1 and 2, an opening 14 for inserting a wiring protection tube (not shown) is provided at the left end of the large-diameter cylindrical portion 11.

A groove 15 is formed in a part of the large-diameter cylindrical portion 11 from the inside.
Is cut out to form a thin portion 16 outside the concave groove 15, and a U-shaped notch 17 continuous with the thin portion 16 is cut and formed as shown in FIG. Notch
With 17, a movable piece 18, which can bend inward and outward from the large-diameter cylindrical portion 11 around the thin portion 16, is formed.

The thin portion 16 is used as a rotation base end of the movable piece portion 18, and a tube locking claw portion 21 is integrally formed on the inner side surface on the opposite end side. The tube locking claw portion 21 has a slope 21a that allows the wiring protection tube to slide in the tube insertion direction, and a check surface 21b that locks the sliding in the opposite direction.

On the other hand, on the outer surface of the movable piece 18, a distal end 22a of an elongated tool 22 such as a driver shown in FIG.
A hook 23 for engaging with the movable piece 18 is integrally formed on the distal end side of the movable piece 18, and a projection 24 serving as a rotation fulcrum of the tool 22 is integrally formed on the base end of the movable piece 18. Molding.

Further, as shown in FIGS. 1 and 2, a plurality of check claws 31, 32 corresponding to different plate thicknesses of the box body 5 are formed in the small-diameter cylindrical portion 12 in the axial direction of the outer peripheral surface. Claw groove 3
Integrally molded with synthetic resin or the like so as to be cut and raised from 3 and 34 respectively.

The tips of the check pawls 31 and 32 projecting in the direction opposite to the contact surface 13 pass through the insertion holes 5a of the box body 5 when they are fitted to the box body 5 and are opposed to each other. When it is released to the side, it is formed into a shape that elastically expands as shown in FIG. 3 by its own elastic restoring force.

The check pawls 31 located on the left and right portions of the small-diameter cylindrical portion 12
The claw groove 33 corresponding thereto is formed to be long, and the check claw portion 32 located at the upper and lower portions of the small-diameter cylindrical portion 12 and the claw groove corresponding thereto are formed to be short. In short, as shown in FIG. 5, the long check pawl 31 and the short check pawl 32 are connected to the small-diameter cylindrical portion 12.
Are provided alternately on the outer peripheral surface of.

The long non-return claw portion 31 is provided with a tip at a position relatively close to the contact surface portion 13, and as shown in FIG.
13 is a non-return claw for a thin plate which sandwiches a metal box body 5 having a relatively thin plate thickness.

On the other hand, the short non-return claw portion 32 is provided with a distal end at a position relatively distant from the contact surface portion 13 and is relatively thick made of synthetic resin between the short claw portion 32 and the contact surface portion 13 as shown in FIG. This is a check claw for a thick plate that sandwiches the thick box body 5.

Next, the operation of the illustrated embodiment will be described.

The wire protection tube 4 shown in FIG.
When the wiring protection tube 4 is inserted into the large-diameter cylindrical portion 11 by inserting the wiring protection tube 4, the groove 4a and the crest 4b are formed on the outer peripheral surface of the wiring protection tube 4.
Are alternately formed, so that the movable piece portion 18 repeats the bending operation of escaping outward due to the peak portion 4b and the operation of elastically returning inward in the valley groove 4a, and finally the pipe locking claw portion The non-return surface 21b of 21 is engaged with the valley groove 4a, so that the wire protection tube 4 can be reliably prevented from being pulled out, and the wire protection tube 4 can be easily connected to the large-diameter cylindrical portion 11 of the joint body 10.

On the other hand, when it is necessary to pull out the wire protection tube 4 from the large-diameter cylindrical portion 11, the tip 22a of a tool 22 such as a screwdriver is inserted into the hook-like portion 23 as shown in FIG. When the handle 22b is operated to lower, the tool 22 acts to push up the hook-like portion 23 by the tip portion 22a with the convex portion 24 as a fulcrum according to the principle of leverage, and the movable piece portion 18 Rotate so that the tip side is opened outward to the center. As a result, the non-return surface 21b of the pipe locking claw portion 21 is brought into contact with the valley groove 4a of the wiring protection pipe 4.
Therefore, the wiring protection tube 4 can be easily taken out from the opening 14 of the joint body 10.

When the pipe joint is to be mounted on a relatively thin metal box body 5 as shown in FIG. 1, the small-diameter tube portion 12 of the joint body 10 is inserted into the insertion hole 5a of the box body 5, and the insertion is first performed. Check tab 32 for thick plate released to the opposite side through hole 5a
Is expanded by its own restoring force, and then the check nail 31 for the thin plate that has passed through the insertion hole 5a is expanded by its own restoring force, and the tip of the check nail 31 and the contact surface 13 are Thus, the joint body 10 can be fitted and fixed to the box body 5 so as to sandwich the box body 5. This operation can be easily performed by one-touch operation simply by inserting the small-diameter cylindrical portion 12 into the insertion hole 5a of the box body 5.

Conversely, the pipe joint is inserted into one insertion hole 5a of the box body 5.
When removing from the mounting hole and replacing it with another insertion hole, the two non-return claw portions 31 and the two non-return claw portions 32 are sequentially sandwiched by pliers or the like, and each is folded into the claw grooves 33 and 34. In the meantime, the small-diameter cylindrical portion 12 of the joint main body 10 is pulled out from one insertion hole 5a of the box main body 5, and is reinserted and locked in another insertion hole as described above.

When the pipe joint is mounted on a relatively thick box body 5 made of synthetic resin as shown in FIG.
When the small-diameter cylindrical portion 12 is inserted into the insertion hole 5a of the box body 5, the check claw portion 32 for the thick plate that has passed through the insertion hole 5a and has been released to the opposite side.
Is expanded by its own restoring force, and the check pawl for this thick plate
The joint main body 10 can be fitted and fixed to the box main body 5 with one touch so that the box main body 5 is sandwiched between the tip of the 32 and the contact surface portion 13. At this time, the check nail 31 for the thin plate is
Into the insertion hole 5a in a closed state.

Next, FIG. 6 shows another embodiment of the present invention. In some cases, it is desired to use the same pipe joint not only for the small-diameter insertion hole 5a but also for the relatively large-diameter insertion hole 5b. The abutment surface portion 13 is formed to have a larger diameter, and has the same inner diameter as the small-diameter insertion hole 5a, and has a relatively large-diameter insertion hole.
By inserting an intermediate member 35 such as a washer (washer) having an outer diameter larger than 5b between the inner surface of the box main body 5 and the short non-return claw portion 32, the pipe joint for the small-diameter hole is relatively large. It can also be used for the diameter insertion hole 5b.

Next, an embodiment of the present invention not shown in the drawings will be described.

The pipe joint of the present invention is not limited to an outlet box for a wall or a concrete box for a ceiling, but can be applied to a case where a pipe is connected to another box body.

In the first aspect of the present invention, the check pawl 31 for a thin plate and the check pawl 32 for a thick plate do not always have to be provided. Either one may be used.

Further, the check pawl portions 31 and 32 may be formed so as to be cut not only from the claw grooves 33 and 34 but also from notch grooves formed by cutting three sides.

In addition, the invention according to claim 2 is not limited to the two types of check claws 31 and 32, but three or more types of check claws corresponding to three or more types of box body plate thicknesses. A part may be provided.

[0041]

According to the first aspect of the present invention, just by inserting the joint body into the insertion hole of the box body, the contact claw portion of the joint body and the check pawl that expands after passing through the insertion hole. Thus, the joint main body can be easily fitted and fixed to the box main body with one touch, and workability at the time of attaching the pipe joint to the box main body can be remarkably improved. Further, since the check claws are formed on the outer peripheral surface of the joint main body, the number of parts of the pipe joint can be reduced, and the cost can be reduced by eliminating the screw groove.

According to the second aspect of the present invention, the same pipe joint can be applied to the insertion holes of the box bodies having different thicknesses by the plurality of check claws corresponding to the thickness of the box body.

According to the third aspect of the present invention, the pipe can be pulled out in the opposite direction only by inserting the pipe into the joint body and using the pipe locking claw projecting from the inner surface of the movable piece. This can be reliably prevented, and the workability of pipe connection to the joint body can be significantly improved. Further, since the pipe locking claw is integrally provided on the joint body via the movable piece, the number of parts of the pipe joint can be reduced, and the cost can be reduced by eliminating screw grooves.

According to the fourth aspect of the present invention, when the tip of the tool is inserted into the hook-like portion and a force is applied to push up the hook-like portion at the tip of the tool with the convex portion as a fulcrum, the tip side of the movable piece becomes The pipe is pivoted so as to open outward, and the pipe locking claw is disengaged from the groove of the pipe, so that the pipe can be pulled out from the joint body as necessary.

According to the fifth aspect of the present invention, the same pipe joint is used for a larger-diameter insertion hole by sandwiching the intermediate member between the inner surface of the box body and the check pawl. be able to.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example in which a pipe joint according to the present invention is used for a relatively thin box body.

FIG. 2 is a sectional view showing an example in which the pipe fitting is used for a relatively thick box body.

FIG. 3 is a perspective view of the same pipe joint.

FIG. 4 is a front view showing an operation when removing the wiring protection tube from the pipe joint.

FIG. 5 is a side view of the pipe fitting.

FIG. 6 is a cross-sectional view showing an example in which the pipe fitting is used for a hole having a different diameter.

FIG. 7 is a sectional view showing a conventional pipe joint.

[Explanation of symbols]

 4 Tube 5 Box body 5a Insertion hole 10 Joint body 11 Large-diameter cylindrical portion as one cylindrical portion 12 Small-diameter cylindrical portion as the other cylindrical portion 13 Contact surface portion 15 Groove 17 Notch 18 Movable piece 21 Pipe locking Claw 22 Tool 23 Hook 24 Convex 31, 32 Non-return claw 35 Intermediate member

Claims (5)

[Claims] 1. A pipe joint for connecting a pipe to a box main body, the pipe joint having one cylindrical part for integrally fitting the pipe and the other cylindrical part fitted to an insertion hole formed in the box main body. A joint body having a contact surface portion provided on the joint body and engaged with a peripheral portion of the insertion hole when fitted into the insertion hole of the box body; and a direction opposite to the contact surface portion from the outer peripheral surface of the joint body. And a check claw portion that is formed and elastically expands on the opposite side through an insertion hole of the box body when fitted to the box body. 2. The pipe joint according to claim 1, wherein a plurality of check claws corresponding to a plurality of plate thicknesses of the box main body are provided at different intervals from the contact surface. 3. A movable piece which can be bent inward and outward of the joint body is formed by a concave groove and a notch formed in the joint body, and a pipe is inserted into an inner surface on a distal end side of the movable piece. 2. The pipe joint according to claim 1, wherein a pipe locking claw for projecting the pipe in the opposite direction and locking the pipe in the opposite direction is provided. 4. A hook-like portion for engaging a distal end portion of an elongated tool is integrally formed on a distal end side of the movable piece portion on an outer surface of the movable piece portion, and a base end side of the movable piece portion. 4. The pipe joint according to claim 3, wherein a convex portion serving as a rotation fulcrum of said tool is integrally formed. 5. The pipe joint according to claim 1, wherein an intermediate member is interposed between the inner surface of the box body and the check pawl.