JP3027062U - Pipe joint tightening device - Google Patents

Abstract

(57) [Abstract] [Problem] To improve workability when tightening a flange in a pipe joint. SOLUTION: Bolt through holes 6 and 8 having a diameter considerably larger than a shaft portion of a bolt used for a flange 4 of a joint receiving port 3 and a push ring 7 are provided. The bolt 10 is provided with an elastic sleeve 13 which is tightly fitted in the bolt through hole 6 on the base end side of the shaft portion 12. The bolt 10 is inserted into the bolt through holes 6 and 8 and tightened with a nut.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tightening device for a pipe joint that connects pipes to each other.

[0002]

[Prior art]

 For pipes such as drainage systems, flange type pipe joints that compress and seal elastic packing are often used in place of conventional screw type pipe joints. As this type of pipe joint, for example, as described in Japanese Utility Model Publication No. 7-10151, a packing material and a lock ring are provided between a flange of a pipe body to be connected and a push ring, and a flange is used. The one that tightens the push ring with bolts and nuts to compress the packing material, and presses the inner peripheral edge of the lock ring against the pipe body for sealing connection.

[0003]

[Problems to be solved by the device]

 By the way, this type of piping system product is used with low accuracy due to site construction, etc., but especially the bolt insertion hole that tightens the flange and the push ring makes it easy to pass the bolt on site. Therefore, it is formed slightly larger than the bolt. As a result, the inserted bolt will fall off, so the nut cannot be tightened with a tool until the nut is screwed in while holding the bolt by hand and tightened by hand to some extent, and it is necessary to perform centering while tightening. Was required and the workability was poor.

The present invention has been made in order to solve the problem that the workability at the time of tightening the flange is poor as described above. A bolt provided with a sleeve that prevents the bolt from falling off and facilitates centering is provided. It is intended to provide a pipe joint tightening device having excellent workability by using the same.

[0005]

[Means for Solving the Problems]

 The structure of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments. According to the present invention, the end portion of the joint pipe 2 is inserted into the joint socket 3 of the joint pipe 1, In the pipe joint in which the push ring 7 inserted into the joint pipe 2 is clamped and coupled to the joint receiving port 3 with the packing material 15 interposed therebetween in the pipe axial direction via the bolt nuts 10 and 18, The flange 4 and the push wheel 7 are provided with bolt through holes 6 and 6 having a diameter larger than that of the bolt 10, and the shaft portion 11 having a diameter smaller than the bolt through hole is elastic so that the bolt through hole 6 is tightly fitted. It is characterized in that a bolt 10 having a sleeve 12 fitted therein is formed, the bolt 10 is inserted into the bolt through holes 6 and 8 and fastened by a nut 18.

[0006]

[Embodiment of device]

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view showing an embodiment of the device according to the present invention, FIG. 2 is a vertical sectional view showing the member separately, FIG. 3 is a vertical sectional view showing a sleeve, and FIG. 4 is a front view thereof. Is.

In the above figures, 1 is a joint pipe, which is provided with a joint receiving port 3 into which the end of the joint pipe 2 is inserted, and a flange 4 having a sealing surface 5 of increased diameter. The flange 4 is provided with a plurality of bolt loose insertion holes 6 and 6 which are staggered holes having a diameter larger than that of a shaft portion 11 of a bolt 10 which will be described later and are circumferentially spaced from each other. Reference numeral 7 denotes a push ring inserted into the joining pipe 2, and bolt loose insertion holes 8 and 8 having substantially the same diameter as the hole 6 are provided at positions corresponding to the bolt insertion holes 6 and 6 of the flange 4. An enlarged diameter step portion 9 is formed on the inner side facing the flange 4.

Reference numeral 10 is a hinged bolt having a turning-preventing head 11 which is inserted into the bolt loose insertion holes 6 and 8, and the shaft portion 12 has a diameter considerably smaller than the bolt loose insertion holes 6 and 8. Has been formed. A sleeve 13 tightly fitted in the bolt loose insertion hole 6 is externally fitted to the base end side of the shaft portion. The sleeve 13 is made of an elastic material such as rubber and has an outer diameter slightly smaller than that of the bolt insertion hole 6 and a height that protrudes slightly outward from the bolt loose insertion hole 6 on the outer periphery thereof. A plurality of ridges 14 and 14 along the axial direction are separated from each other, and a flange portion 15 that is in contact with the head portion 11 of the bolt 10 is provided at the base end portion.

Reference numeral 16 is a lock packing composed of an annular packing material 17 elastically fitted to the outer periphery of the joint pipe 2 and a lock ring 18 made of a hard metal.

In order to join the joint pipe 1 and the joint pipe 2, the push ring 7 and the lock packing 16 are fitted to the ends of the joint pipe 2 and joined to the joint receiving port 3 as shown in FIG. Insert the end of the tube 2 and push the tip of the lock packing 16 into the recess with the sealing surface 5. Then, as shown in FIG. 1, the enlarged-diameter stepped portion 9 of the push wheel 7 is fitted to the rear portion of the lock packing, and the bolt 10 is inserted from the bolt loose insertion hole 6 of the flange 4 to the bolt loose insertion hole 8 of the pushing portion 7. And then tighten the nut 19 to tighten it.

At that time, since the diameter of the bolt 10 is considerably smaller than the diameter of the bolt loose insertion hole 8, it becomes easy to insert the bolt 10 in the field, and the bolt loose insertion holes 6 and 8 are not connected to each other. The position of the bolt 10 does not have to be strict, and the bolt 10 comes into close contact with the bolt loose insertion hole 6 through the ridges 14, 14 of the elastic sleeve 13, so that the bolt 10 is prevented from falling off. Then, by tightening the nut 19, the ridges 14, 14 of the sleeve 13 are press-fitted into the bolt loose insertion holes 6 so that the entire sleeve 3 is tightly fitted and the mutual axes are aligned. Since the flange portion 15 of the sleeve 13 adheres to the end surface of the flange 4, the bolt 10 has a rotation preventing effect when tightening, and the nut 19 can be tightened simply by closing it.

By the tightening with the bolts and nuts, the packing material 17 of the lock packing 16 is compressed in the pipe axial direction and pressed against the seal surface 5 of the joint receiving port 3 and the outer surface of the joint pipe 2 to maintain watertightness. At the same time, the inner circumference of the lock ring 18 comes into pressure contact with the outer circumferential surface of the joint pipe 2 and bites into it, so that the joint pipe 2 is prevented from coming out. The bolt 10 may be a normal bolt having a hexagonal head, without using a T-shaped bolt as in the illustrated example.

[0013]

[Effect of device]

 As described above, according to the present invention, a bolt having a sleeve that can be tightly fitted in the bolt loose insertion hole of the flange is used on the shaft portion having a diameter considerably smaller than the bolt loose insertion hole of the joint receiving flange and the push ring. Since the bolts are tightened by tightening the bolts, when the bolts are inserted into the bolt loose insertion holes, the bolts will not come off due to the sleeve being in close contact with the bolt loose insertion holes and the flange. Without the need to use a tool from the start of screwing the nut, the bolt will not run idle and workability when tightening the flange will be greatly improved. It is especially effective for work in high places and narrow places. Further, since the bolt is tightly fitted in the bolt loose insertion hole through the sleeve, the nuts can be tightened to automatically align the two. However, since the bolt does not idle when the nut is screwed in, the bolt can be an ordinary inexpensive hexagon head bolt instead of the expensive T-bolt as in the past, and the cost can be reduced.

[Submission date] January 30, 1996

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

Reference numeral 10 is a T-shaped bolt having a rotation-preventing head 11 that is inserted through the bolt loose insertion holes 6 and 8 and its shaft portion 12 has a diameter considerably smaller than the bolt loose insertion holes 6 and 8. Has been formed. A sleeve 13 that is tightly fitted in the bolt loose insertion hole 6 is externally fitted to the base end side of the shaft portion. The sleeve 13 is made of an elastic material such as rubber and has an outer diameter slightly smaller than that of the bolt insertion hole 6, and the outer periphery thereof slightly projects outward from the bolt loose insertion hole 6. A plurality of protrusions 14, 14 having a height along the axial direction are spaced from each other, and a flange portion 15 that is in contact with the head portion 11 of the bolt 10 is provided at the base end portion.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

In order to join the joint pipe 1 and the joint pipe 2, the push ring 7 and the lock packing 16 are fitted to the end of the joint pipe 2 and joined to the joint receiving port 3 as shown in FIG. The end of the tube 2 is inserted and the tip of the lock packing 16 is pushed into the recess having the sealing surface 5. Then, as shown in FIG. 1, the enlarged diameter stepped portion 9 of the push wheel 7 is fitted to the rear portion of the lock packing, and the bolt loose insertion hole 6 of the flange 4 is bolted to the bolt loose insertion hole 8 of the push wheel 7. 10 is inserted, and the nut 19 is screwed and tightened.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013]

[Effect of device]

 As described above, according to the present invention, a bolt having a sleeve that can be tightly fitted in the bolt loose insertion hole of the flange is used on the shaft portion having a diameter considerably smaller than the bolt loose insertion hole of the joint receiving flange and the push ring. Since the bolts are tightened by tightening the bolts, when the bolts are inserted into the bolt loose insertion holes, the bolts will not come off due to the sleeve being in close contact with the bolt loose insertion holes and the flange. Without the need to use a tool from the start of screwing the nut, the bolt will not run idle and workability when tightening the flange will be greatly improved. It is especially effective for work in high places and narrow places. Further, since the bolt is tightly fitted in the bolt loose insertion hole through the sleeve, the nuts can be tightened to automatically align the two. However, since the bolt does not run idle when the nut is screwed in, the bolt can be an ordinary inexpensive hexagon head bolt instead of the expensive T-bolt as in the past, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the device of the present invention.

FIG. 2 is a vertical cross-sectional view showing the same member separately.

FIG. 3 is a vertical sectional view showing a sleeve fitted to a bolt.

FIG. 4 is a front view of the same.

[Explanation of symbols]

 1 joint pipe 2 joint pipe 3 joint socket 4 flange 6,8 bolt through hole 7 push ring 10 bolt 11 shaft part 12 sleeve 13 ridge 15 lock packing 16 packing material 17 lock ring 18 nut

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Yasuo Takahashi 4-5-6 Nishikawaguchi, Kawaguchi City, Saitama Prefecture (72) Creator Muneo Okabe 2-26-4 Umejima, Adachi-ku, Tokyo Tokyo Gom Products Co., Ltd. Within

Claims (1)

[Scope of utility model registration request] Insert the end of the joint pipe into the joint socket of the joint pipe, and insert the push ring inserted into the joint pipe into the joint socket by tightening the packing material in the pipe axial direction with bolts and nuts. In a pipe joint, the flange and the push ring of the joint receiving hole are provided with a bolt through hole having a diameter larger than that of the bolt, and the shaft portion having a diameter smaller than the bolt through hole has an elasticity that is tightly fitted into the bolt through hole. A fastening device for a pipe joint, characterized in that a bolt fitted with a sleeve is formed, the bolt is inserted into a bolt through hole and fastened with a nut.