JPS5848458Y2 - pipe joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved pipe joint structure.

Previously proposed pipe joints of this type are those that can prevent the connecting pipe from being pulled out but do not have elasticity; Some of them lacked the function to prevent them from falling off.

For pipe joints with the structure described above, if a pull-out force is applied to the connecting pipe during earthquakes, ground law changes, etc., the former case may be damaged due to abnormal force being applied to the joint part, and the latter case may be damaged. In this case, there were drawbacks such as the connecting pipe sometimes coming off.

In the present invention, the end 2 of the insertion tube 1 is inserted into the mouth end of the main mouth tube 4 having the screw 3, and a backing 5, a push ring 6, and an inner circumferential portion are attached to the outer peripheral surface 7 of the insertion tube 1. An end ring 10 having a toothed portion 8 and a tapered portion 9 formed on the outer periphery is placed on the insertion tube 1 in that order, and the insertion tube 1 is fitted,
An outer thread 11 is formed to be screwed into the inner regulator 3 provided at the mouth end of the main port pipe 4, and an outer thread 11 is formed on the inner circumferential surface of the rear end portion 12 and the inner circumferential surface of the tip portion 14 that contacts the push ring 6. , each of which has tapered walls 13.15 abutting the tapered portion 9 of the end ring 10, and has a straight wall 135 between each of the tapered walls 13.15. 4
This is a pipe joint formed by pressing the end 2 of the insertion tube 1 into the mouth end of the tube. The purpose is to prevent loose connections and disconnections, and also to provide elasticity.

Since the present invention has the above-mentioned configuration, the watertightness of the end 2 of the insertion tube 1 inserted into the mouth end of the main mouth tube 4 having the internal regulator 3 is determined by the watertightness of the end 2 of the insertion tube 1 that is The distal end 14 of the sleeve tube 16 screwed onto the eye end of the tube 4 is secured liquid-tightly by the backing 5 which is pressed via the push ring 6 in contact with the end 2 of the insertion tube 1. A tapered portion 9 is formed on the outer periphery, with which the tapered wall 15 formed on the inner periphery of the tip 14 of the tube 16 abuts, and a toothed portion 8 that bites into the outer periphery T of the insertion tube 1 is formed on the inner periphery. Since it is stably supported by the end ring 10, it is possible to securely connect the insertion tube 1 with the end 2 inserted inside the eye end of the reception tube 4.
When the insertion tube 1 connected as described above is subjected to a pull-out force greater than that caused by an earthquake, ground subsidence, or change in the pressure of the fluid flowing inside, the inner periphery of the tip 14 of the sleeve tube 16 may form. The end ring 10 having a tapered portion 9 formed on its outer periphery that abuts against the tapered wall 15 contracts in the radial direction, and the teeth 8 formed on its inner periphery bite into the outer circumferential surface 7 of the insertion tube 1. When the initial withdrawal of the insertion tube 1 is prevented and a strong withdrawal force is further applied to the insertion tube 1, the end ring 10 is contracted in the radial direction by the tapered wall 15, and the toothed portion 8 is further tightened around the outer periphery of the insertion tube 1. A straight wall 135 that bites into the surface 7 and is connected to the tapered wall 15 while keeping the biting force constant.
While moving in the withdrawal direction along with the insertion tube 1, the withdrawal force is reduced and absorbed, and finally, as shown in Fig. 2,
The tapered portion 9 formed on the outer circumference of the end ring 10 abuts against the tapered wall 13 formed on the inner circumferential surface of the rear end portion 12 of the sleeve tube 16, and is further compressed in the radial direction. As a result, Since the tooth portion 8 formed on the inner circumference bites deeper into the outer circumferential surface 7 of the insertion tube 1 and reliably bites the insertion tube 1, the connected insertion tube will not be pulled out.

Therefore, according to the present invention, there is an advantage that the insertion tube can be connected reliably and that the connected insertion tube can be effectively prevented from being pulled out.In addition, by providing the straight wall, it is possible to prevent the connected insertion tube from being pulled out. The structure absorbs the expansion and contraction of the tube, so
Since no excessive force is applied to the joint, there is no risk of damage to the pipe or the joint.

Furthermore, after fitting the backing, push ring, and end ring in that order inside the mouth end of the socket tube into which the end of the insertion tube has been inserted, the push ring and the end ring are inserted into the socket tube. Since it is only necessary to press the tip of the sleeve tube that is screwed onto the mouth end, this kind of connection work can be easily performed, which is extremely convenient in terms of construction.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional side view of the main parts showing a connected state, and FIG. 2 is a longitudinal sectional side view showing a state in which the insertion tube has moved in the withdrawal direction. 1... Insertion tube, 2... End, 3...
...Inner screw, 4...Socket tube, 5...
Backing, 6... Press ring, 7... Outer circumferential surface, 8... Teeth, 9... Part of taper,
10...Ended ring, 11...Outer screw, 12...Rear end, 13...Tapered wall, 14...Tip Part, 15...Tapered wall, 16...Sleeve pipe, 135...
・Straight wall.

Claims (1)

[Scope of utility model registration request] Main opening tube 4 having an inner guide 3 into which the end 2 of the insertion tube 1 is inserted
A backing 5, a press ring 6, a toothed portion 8 that bites into the outer circumferential surface 7 of the insertion tube 1 on the inner periphery, and an end ring 10 having a tapered portion 9 on the outer periphery are installed in that order. The insertion tube 1 is fitted onto the insertion tube 1, and an outer thread 11 is formed to be screwed into the inner guard 3 provided at the eye end of the main mouth tube 4. Forming tapered walls 13° and 15 on the inner circumferential surface and on the inner circumferential surface of the tip portion 14 that contacts the push ring 6, respectively, to abut the tapered portion 9 of the end ring 10,
A pipe joint formed by pressing the end 2 of the insertion tube 1 into the mouth end of the main tube 4 by a sleeve tube 16 having a straight wall 135 between the tapered walls 13 and 15.