JPH029237B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a box connector used to connect a corrugated flexible tube to a box.

[Background technology]

Conventionally, there is a commonly used box connector for connecting corrugated flexible tubes as shown in FIG. 1, and a box connector as shown in FIG. 2 is also available on the market. The box connector shown in Fig. 1 has a cylindrical body (connector main body) 3 whose front end becomes a flexible tube connection part 1 and whose rear end becomes a box connection part 2.
A stopper part (flexible tube connecting part) 4 is connected to the tip of the connecting part 1 so as to be bendable inside the cylinder 3. The stopper portion 4 is provided with protrusions (claws) 4a on a surface that becomes inside when the stopper portion 4 is bent inside the cylindrical body 3. This protrusion 4
is for fitting into the concave and concave portions 5a of the corrugated flexible tube 5. The inner peripheral surface of the connecting portion 2 is provided with a female thread 2a that is screwed into the threaded portion 6a of the nipple 6.

This box connector is connected to the flexible tube 5 in the following manner. That is, as shown by the solid line in FIG. into the recess 5a of the flexible tube 5. This box connector has a problem in that once the flexible tube is inserted into the flexible tube connection part, the flexible tube cannot be removed, so it is impossible to remove the flexible tube from the box connector and redo the piping. Ta.

The box connector shown in FIG. 2 has a cylindrical body 7, a nut 8, and a cylindrical grip 9, respectively. The front end of the cylindrical body 7 has a male thread 7a, and the rear end has a threaded portion 10 of a nipple 10.
A female thread 7b is provided, which is screwed into the part a. The connecting tube 8 has a male thread 7a of the cylindrical body 7 at the rear end.
A female thread 8a is provided to be screwed into the inner peripheral surface, and the inner circumferential surface is a tapered surface 8b whose diameter becomes smaller toward the front. The cylindrical grip 9 is housed in the connecting tube 8 and has a protrusion 9a that fits into the uneven recess 11a on the outer periphery of the corrugated flexible tube 11, and has a taper that fits the tapered surface 8b of the connecting tube 8. The surface 9b is the outer peripheral surface. and,
This cylindrical grip 9 is provided with a notch 9c extending from the front end to the rear end, so that its diameter can be changed.

This box connector is connected to the flexible tube in the following manner. First, the cylindrical body 7 of the connecting tube 8
The diameter of the cylindrical grip 9 is increased by loosening the fitting between the corrugated flexible tube 11 and the cylindrical grip 9.
is pushed through the front end opening of the connecting tube 8, and its tip is inserted into the cylindrical grip 9. When the connecting tube 8 is tightened against the cylindrical main body 7, the diameter of the cylindrical grip 9 becomes smaller, and its protrusions 9a also become closer to the corrugated flexible tube 1.
The corrugated flexible tube 11 is connected to the box connector.

In this box connector, the connection of the corrugated flexible tube can be released by loosening the connecting tube with respect to the cylindrical body and increasing the diameter of the cylindrical grip. However, due to the large number of components,
The problem was that it was difficult to manufacture.

[Purpose of the invention]

This invention was made in view of these circumstances, and because the number of component parts is small, it is easy to manufacture.
To provide a box connector which can reliably connect a corrugated flexible tube with a simple operation and also allows the corrugated flexible tube to be freely connected and detached.

[Disclosure of the invention]

In order to achieve the above object, the present invention has a cylindrical body and a cylindrical tightening body fitted onto the cylindrical body so as to be movable back and forth, and the cylindrical body has a front outer peripheral surface. has a tapered surface whose diameter becomes larger toward the front, and this tapered surface is provided with a convex portion for fixing the clamping body, and the inner circumferential surface is provided with a concave portion on the outer circumferential surface of the corrugated flexible tube. A protrusion for connecting the corrugated flexible tube to be inserted is provided, and a notch extending in the axial direction is provided on the front circumferential wall so that the diameter can be changed. A convex portion serving as a guide for forward and backward movement and a screw for connecting the box are provided, and the inner peripheral surface of the tightening body has a tapered surface that matches the tapered surface of the cylindrical body, This tapered surface includes a guide groove that extends in the axial direction and is open at the rear end, into which the guide convex portion of the cylindrical body is inserted, and a guide groove that extends in the circumferential direction and becomes deeper at one end and gradually shallower at the other end. The gist of the box connector is that a groove is provided deep into which a tightening body fixing projection is inserted when the tightening body is guided by a guide projection of a cylindrical body and moves forward.

Hereinafter, the present invention will be described in detail based on drawings showing embodiments.

As shown in FIGS. 3 to 5, the box connector 12 according to the present invention includes a cylindrical main body (connector main body) 13 and a cylindrical fastener externally fitted onto the cylindrical main body 13 so as to be movable back and forth. Attached body (tightening sleeve) 1
Has 4. The cylindrical main body 13 is a, b, c in FIG.
As shown in FIG. 5, the outer peripheral surface of the front part (flexible tube connection side) is a tapered surface 13a whose diameter increases toward the front, and the front end of the tapered surface 13a (where the outer diameter is the maximum Two protrusions (convex portions) 13b extending along the circumferential direction are provided near the position (near the position). The protrusions 13b are used for fixing the fastening body, and the number thereof is not particularly limited. Two protrusions (protrusions) 13c for connecting a corrugated flexible tube extending along the circumferential direction are also provided at the front end of the front inner circumferential surface, and the front circumferential wall is provided with a large or small diameter. Two notches (split grooves) 13d are provided so that they can be changed. Number of protrusions 13c and notches 13
The number of d is also not particularly limited. A flange 13 is provided on the outer peripheral surface of the tip of the rear (box connection side) of the cylindrical body 12.
e, and one protrusion (projection) 13h extends in the axial direction from the front surface of the flange 13e. The number of these protrusions 13h is not particularly limited.
A threaded portion 15a of the nipple 15 is provided on the rear inner peripheral surface.
(See FIG. 5) is provided with a female screw 13f that is screwed into the screw. The flange 13e is provided with a protrusion 13g to facilitate retightening when attaching the box connector to the box.
It is becoming easier to use pipe wrenches, etc. As shown in FIGS. 4a and 4b and FIG. 5, the tightening body 14 has an inner peripheral surface formed into a tapered surface 14a that matches the tapered surface 13a of the cylindrical main body 13,
A guide groove 14d that extends in the axial direction and is open at the rear end is provided on the inner circumferential surface of the tapered surface 14a from the middle part to the rear part, and a groove (recess) 14b that extends in the circumferential direction is also provided at the front end. There are two.
The protrusion 13h of the cylindrical main body 13 is inserted into the groove 14d, and the protrusion 13b of the cylindrical main body 13 is inserted into the groove 14b. The groove 14d is deep at one end and gradually becomes shallower at the other end, and the protrusion 13h guides the clamping body so that the protrusion 13b is inserted deep into the groove 14b. Here, groove 14b
The protrusion 13b is provided so that it has the same depth up to about 1/2 of its length from one end, and the rest gradually becomes shallower as it approaches the other end until the depth becomes 0.
The length is shorter than 1/2 of the length of the groove 14b. [See Figure 7 a]. On the outer circumferential surface of the tightening body 14, a non-slip member 14c made of unevenness is provided.

This box connector is connected to the corrugated flexible tube and the box, for example, in the following manner. As shown in FIG. 5, first, the threaded part 15a of the nipple 15 is inserted from inside the box into the hole 16a provided in the wall 16 of the box, and is caused to protrude outside. Insert into the female thread 13f of the shaped main body 13. And the cylindrical body 13
flange 13e and flange 15 of nipple 15
The box connector 12 is connected to the wall 16 of the box by sandwiching the wall 16 with b. Next, as shown in FIG. 6a, the tightening body 14
In order to reduce or eliminate the insertion resistance of the corrugated flexible tube 17 by retracting the cylindrical body 1,
3. Keep the diameter of the front part enlarged. At this time, the guide protrusion 13h is fitted into the groove 14d. After this, cylindrical body 1
3. Insert the corrugated flexible tube 17 from the front opening of FIG.
As shown in FIG. 7, the clamping body 14 is advanced, and the protrusion 13b of the cylindrical body 13 is inserted deep into the groove 14b of the clamping body 14, as shown in FIG. 7a. The cylindrical body 13
Reduce the front diameter. At this time, as shown in FIG. 6b, the protrusion 13h is pulled out from the groove 14d, and as shown in FIG. It is inserted into an uneven recess 17a formed on the outer peripheral surface of the tube 17. Next, as shown in FIG. 6c, the tightening body 1
4 (about 90 degrees in this example), and rotate the 7th
As shown in figure b, the protrusion 13b is inserted into the shallow part of the groove 14b. Then, the corrugated flexible tube 17 is tightened more strongly at the front part of the cylindrical body, and the protrusion 13c of the cylindrical body 13 is deeply inserted into the recess 17a of the corrugated flexible tube 17.
It is firmly connected to the box connector 12.

In this way, the connecting operation of the corrugated flexible tube 17 is very simple because it is only necessary to move the clamping body 14 forward and then rotate it. When removing the corrugated flexible tube 17 from the box connector 12, rotate the clamping body 14 in the opposite direction to when connecting, then move it back to increase the diameter of the front part of the cylindrical body 13, and release the connection. Pull out the corrugated flexible tube 17.

In the box connector according to the present invention, when the corrugated flexible tube is connected, the protrusions of the cylindrical body are inserted into the grooves of the clamping body, so that the clamping body automatically moves due to vibration etc. There is no possibility that something like that would happen if the corrugated flexible tube were to come off by itself from the box connector due to backing up. Therefore, the corrugated flexible tube can be reliably connected. If the tip of the projection 13h is positioned immediately behind the rear end of the clamping body 14 when the clamping body 14 moves forward as in the above embodiment [see b in FIG. 6], the clamping After rotating the body 14, the rear end of the tightening body 14 is connected to the protrusion 13.
Since it hits the tip of h, the clamping body 14 cannot retreat [see c in FIG. 6]. Therefore,
This eliminates the risk of something like what happens when the corrugated flexible tube shifts on its own. By rotating the clamping body, the inner wall surface of the front part of the cylindrical body is strongly pressed against the corrugated flexible tube and the corrugated flexible tube can be firmly connected, so the box connector can be inserted into the fresh concrete. Even if you do
There is no risk of fresh concrete entering the box connector. Since it consists of two components, the clamping body and the cylindrical body, the number of components is small and manufacturing is easy. In addition, material costs are low and manufacturing costs are low. The corrugated flexible tube can be repeatedly connected and disconnected, making it economical and reusable.

In the embodiment described above, a female thread into which the threaded portion of the nipple is inserted is provided at the rear end as a means for connecting the boxes, but a thread may be provided on the outer peripheral surface of the rear end. In this case, the box connector is connected to the box by inserting a lock nut into this male thread. In the embodiment, a long protrusion is provided on the cylindrical body for fixing the clamping body and for guiding, but a dotted protrusion may be provided instead of the protrusion.

〔Effect of the invention〕

The box connector according to the present invention has a cylindrical body and a cylindrical tightening body fitted onto the cylindrical body so as to be movable back and forth, and the diameter of the cylindrical body decreases as the front outer peripheral surface approaches the front. The tapered surface becomes larger, and this tapered surface is provided with a convex portion for fixing the clamping body, and the inner circumferential surface is provided with a corrugated flexible tube to be inserted into the concave portion of the outer circumferential surface of the corrugated flexible tube. A convex portion for connecting the flexible pipe is provided, and a notch extending in the axial direction is provided on the front circumferential wall so that the diameter can be changed in size, and the rear portion serves as a guide for the forward and backward movement of the clamping body. A convex portion and a screw for connecting the box are provided, and the inner circumferential surface of the tightening body has a tapered surface that matches the tapered surface of the cylindrical body, and the tapered surface includes: A guide groove extends in the axial direction and is open at the rear end, into which the guide protrusion of the cylindrical body is inserted; When the main body moves forward guided by the guide convex part, there is a groove in the deep part into which the tightening body fixing convex part is inserted, so the number of components is small, easy to manufacture, and easy to operate. The corrugated flexible tube can be firmly connected, and the corrugated flexible tube can be freely connected and detached.

[Brief explanation of drawings]

1 and 2 are partially cutaway side views of a conventional box connector, FIG. 3a is a front view of the cylindrical body of the box connector according to the present invention, and FIG. 4a is a vertical sectional view of the clamping body of the box connector according to the present invention; FIG. 4b is a side sectional view of the clamping body; FIG. 5 6 is a partially cutaway side view showing the box connector according to the present invention connected to the box by a nipple, and FIGS. 6 a to c and FIGS. It is an explanatory view when connecting a corrugated flexible tube to a connector. 12... Box connector, 13... Cylindrical body, 1
3a...Tapered surface, 13b...Protrusion for fixing the clamping body (protrusion), 13c...Protrusion for connecting corrugated flexible pipe (protrusion), 1
3d...notch, 13f...female thread, 13h...guide protrusion (protrusion), 14...tightening body, 14a...tapered surface, 14b...groove (recess), 14d...guide groove.

Claims (1)

[Claims] 1. A cylindrical main body and a cylindrical tightening body externally fitted onto the cylindrical main body so as to be movable back and forth, and the diameter of the cylindrical main body increases as the front outer circumferential surface approaches the front. The tapered surface is provided with a convex portion for fixing the clamping body, and the inner circumferential surface is provided with a corrugated flexible tube to be inserted into the concave portion of the outer circumferential surface of the corrugated flexible tube. A convex part for connecting the pipe is provided, and a notch extending in the axial direction is provided on the front circumferential wall so that the diameter can be changed in size, and a convex part on the rear part serves as a guide for the forward and backward movement of the clamping body. and a screw for connecting the box, and on the other hand, the inner circumferential surface of the tightening body has a tapered surface that matches the tapered surface of the cylindrical body, and this tapered surface has a shaft. A guide groove that extends in the direction and is open at the rear end and into which the guide protrusion of the cylindrical body is inserted; A box connector that is provided with a groove deep into which a tightening body fixing protrusion is inserted when the box connector moves forward while being guided by the guide protrusion. 2 The guide convex part of the cylindrical body is located behind the clamping body when the clamping body moves forward and the clamping body fixing convex part of the cylindrical body matches the corresponding concave part of the clamping body. A box connector according to claim 1, wherein the box connector is formed so that its front end is located immediately after the end.