JP2002066948A - Pipe joint tightening tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint tightening tool capable of easily performing the execution works without digging a very large working pit. SOLUTION: An operation bolt 11 to be operated by a tool such as a pipe wrench is provided so that the axis Q of rotation is orthogonal to the axis P of an objective pipe, and located within a range occupied by a joint holder 10 with respect to the direction of the axis P. The rotation of the operation bolt 11 is transmitted to a second spur gear 24 via a first bevel gear 12, a second bevel gear 13, and a first spur gear 14 to rotate a gland 71 together with the second spur gear 24. The pipe joint tightening tool 50 capable of performing the execution without digging any very large working pit around the objective pipe can be provided thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint tightening tool for tightening or loosening a pipe joint for connecting a cast iron pipe or the like buried underground. More specifically, the present invention relates to a pipe joint tightening tool that can be installed without digging a working well too much.

[0002]

2. Description of the Related Art As a conventional tool of this type, Japanese Utility Model Publication No. 6
A pipe connection tool described in JP-A-3-2300 is exemplified. The pipe connection tool described in this publication includes an operation lever 82 swingable in the direction of an arrow in the figure and an axis Z parallel to the pipe axis direction X, as shown in FIG. And a rotatable wide spur gear 83. The pivot axis Y of the operation lever 82 and the spur gear 83 are formed by a pair of bevel gears 85 and 8.
5 are connected. A ratchet mechanism is interposed between the operation lever 82 and the bevel gear 85. The body frame 81 on which these are mounted is fixed to the socket 84 of the pipe joint by chains 88,88.

At the end of the socket 84, a flange 90 having a large-diameter narrow-width spur gear 87 is attached. The spur gear 87 and the flange 90 are of an upper and lower split type, and are detachably attached to the end of the socket 84. In the state of FIG. 3, it is hidden by the flange 90 and cannot be seen.
There is a pressing ring at the end. The pressing ring cannot be removed from the end of the socket 84. By screwing the press ring, the socket 84 and the new pipe 86 are fixed.

In the state shown in FIG. 3, the spur gear 87 and the flange 90, and the pressing ring inside them can rotate only integrally. Further, the spur gear 87 and the spur gear 83 mesh with each other. Therefore, when the operation lever 82 is swung, the spur gear 87 and the flange 90 rotate through the ratchet mechanism, the bevel gear pair 85, 85, and the spur gear 83. Accordingly, the press wheel also rotates and is screwed. As a result, the socket 84 and the new pipe 86 are fixed. After the operation, the chains 88, 88 are loosened to remove the main body frame 81, and then the spur gear 87 and the flange 90 may be separated and removed.

[0005]

However, the above-mentioned prior art has the following problems. In other words, the work cannot be done unless the work pit is dug large. This is because it is necessary to secure a swing space for the operation lever 82 projecting substantially perpendicularly to the pipe axis direction. Generally, the working pit is dug to the right of the position where the operation lever 82 is drawn in FIG. 3, and is dug laterally therefrom to expose the entire joint portion. Therefore, the operation of the operation lever 82 cannot be performed unless the side hole is extremely large. In particular, a problem occurs on the back side of the horizontal hole (generally, on the delivery destination side).

The present invention has been made to solve the above-mentioned problems of the prior art. That is, it is an object of the present invention to provide a pipe joint tightening tool which can easily perform a construction work without digging a work pit so much.

[0007]

SUMMARY OF THE INVENTION A pipe joint tightening tool according to the present invention, which has been made to solve the above-mentioned problems, has an operation part capable of rotating from outside and a first part receiving rotation transmitted from the operation part. A gear, and a fixed part for fixing the operating part and the first gear to the target pipe, wherein the fixed part holds the operating part and the first gear.
When the gear is fixed to the target pipe, the rotation axis of the operation unit is fixed in a direction intersecting the central axis direction of the target pipe, and the rotation of the first gear tightens or loosens the pressing ring at the joint portion of the target pipe. . Here, the rotation axis of the operation section is within the range of the fixed section in the axial direction of the target pipe, and the shortest distance between the rotation axis of the operation section and the central axis of the target pipe is smaller than the outer radius of the target pipe. And at least one of the above.

In the pipe joint tightening tool of the present invention, when the operation unit is rotated while the operation unit and the first gear are fixed to the target pipe by the fixing unit, the operation unit is rotated and the rotation is stopped. It is transmitted to one gear. Therefore, the first gear also rotates. Due to the rotation of the first gear, the pressing wheel at the joint portion of the target pipe is tightened or loosened. Here, the above-described operation is performed in a state where the operation unit is fixed in a direction crossing the central axis direction of the target tube. For this reason, when operating the operation unit with a pipe wrench or the like, the pipe wrench may be arranged along the target pipe and rocked. For this reason, a small operation space is not required, and the working well may be small.

If the rotating shaft of the operating part is out of the range of the fixed part, a large operation space is required in either the case where the joint is attached to the existing pipe or the case where the new pipe is attached to the joint. is there. In addition, as the shortest distance between the rotation axis of the operation unit and the central axis of the target pipe increases, the pipe wrench that operates the operation unit is located farther from the target pipe. This means that a large operation space is required, so that the work pit needs to be dug greatly. This is not the case with the pipe joint tightening tool of the present invention.

In this case, the fixing part is an operation part and a first part.
“Fixing” the gear to the target tube simply means fixing the positional relationship. Specifically, even when the operation unit and the first gear are fixed to the target pipe by the fixing unit, rotation of the operation unit and the first gear around the axis is not hindered thereby. In addition, it is practically easy for the first gear to make the rotation axis direction thereof intersect with the rotation axis direction of the operation unit. The “fixed part”
Either a chuck type by sandwiching the target pipe or a chain type by a chain may be used. The “intersecting direction” refers to a direction that is not parallel. The “target pipe” is any of the existing pipe, the joint, and the new pipe. Generally, an object to be fixed by the fixing part is a joint.

[0011] The pipe joint tightening tool of the present invention is attached to the press ring of the joint portion of the target pipe, and has a second gear that meshes with the first gear in the attached state, and the second gear is rotated by rotation of the first gear. It is desirable that the gear and the pressing wheel at the joint of the target pipe rotate together.
In this case, when the operation of rotating the operation unit is performed,
The rotation of the operation unit is transmitted to the second gear and the pressing wheel at the joint of the target pipe via the first gear. As a result, the press ring at the joint portion of the target pipe is tightened or loosened.

[0012]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
In this embodiment, the present invention is applied to a pipe joint tightening tool for tightening or loosening a joint portion of a gas pipe buried in the soil. FIG. 1 is a side view showing a state in which the pipe joint tightening tool according to the present embodiment is attached to a gas pipe as a target pipe. The fitting tightening tool 50 of FIG.
Is roughly divided into a first tool 1 attached to the middle part 70 of the pipe joint and a second tool 2 attached to the pressing wheel 71 at the end of the pipe joint.

The first tool 1 includes a joint scissors 10 for holding the middle portion 70, an operation bolt 11 that can be rotated by a tool 51 such as a pipe wrench, a first bevel gear 12 coaxial with the operation bolt 11, It has a second bevel gear 13 that meshes with one bevel gear 12 and a first spur gear 14 that is coaxial with the second bevel gear 13. The joint scissors 10 are provided with fastening bolts 15. As shown in FIG. 2, the scissors receiving member 16 is provided on the back side of the joint scissors 10.
And the middle part 70 is sandwiched between them. The tightening bolt 15 performs the tightening and loosening of the clamping. When the middle part 70 is sandwiched between the joint scissors 10 and the scissors receiving member 16, the first tool 1 is fixed to the middle part 70.

In the first tool 1, the operation bolt 11 and the first bevel gear 12 rotate integrally. In addition, the second bevel gear 13 and the first spur gear 14 also rotate integrally. The rotation axis Q of the operation bolt 11 and the first bevel gear 12 is orthogonal to the rotation axis R of the second bevel gear 13 and the first spur gear 14. Then, in a state where the middle abdomen 70 is sandwiched between the joint scissors 10 and the scissors receiving member 16,
The rotation axis Q of the operation bolt 11 and the first bevel gear 12 is orthogonal to the center axis P of the target pipe.
In this state, the central axis P of the target pipe and the rotation axis R of the second bevel gear 13 and the first spur gear 14 are also parallel.
Furthermore, the rotation axis Q of the operation bolt 11 and the first bevel gear 12 is located within a range occupied by the joint scissors 10 with respect to the direction of the center axis P of the target pipe.

The second tool 2 has a two-part structure including an upper member 21 and a lower member 22. The upper member 21 and the lower member 22 are connected by bolts 23, so that the pressing wheel 7 is
1 to form an annular shape. Both the upper member 21 and the lower member 22 are in the axial direction (the horizontal direction in FIG. 1).
A spur gear portion is provided substantially at the center of the gear. When the upper member 21 and the lower member 22 are connected to each other, the two spur gear portions are combined to form a second spur gear 24. In a state where the upper member 21 and the lower member 22 are connected, the second tool 2 and the pressing wheel 71 can rotate only integrally. Since the upper member 21 and the lower member 22 are integrally rotated as described above, there is no significant meaning between the upper and lower portions.

When both the first tool 1 and the second tool 2 are correctly mounted, the first tool 1
The spur gear 14 and the second spur gear 24 of the second tool 2 mesh with each other. Here, the first spur gear 14 and the second spur gear 14
The spur gears 24 both have a considerable width in the axial direction (the left-right direction in FIG. 1). As a result, even if there is some movement in the axial direction, there is no problem in meshing.

When the pipe joint is actually tightened by the pipe joint tightening tool 50, the following is performed. First,
The first tool 1 and the second tool are connected to the pipe joint (one end (the left side in FIG. 1) is already fixed to the existing pipe).
With the tool 2 not attached, the new pipe 72 is inserted into the free end of the pipe joint. Then, the second tool 2 is attached to the pressing wheel 71 into which the new pipe 72 is inserted. Next, the first tool 1 is attached to the middle part 70 of the pipe joint so that the first spur gear 14 and the second spur gear 24 mesh with each other. Thus, the pipe joint tightening tool 50 is mounted on the target pipe.

Therefore, a suitable tool 51 such as a pipe wrench is used.
Accordingly, when the operation bolt 11 of the first tool 1 is rotated, the new ring 72 can be fixed to the pipe joint by tightening the pressing wheel 71. That is, the first bevel gear 12 rotates together with the operation bolt 11, and the rotation is transmitted to the second bevel gear 13. Therefore, the first spur gear 14 rotates together with the second bevel gear 13, and the rotation is transmitted to the second spur gear 24. Therefore, the second tool 2 (the second spur gear 24) and the pressing wheel 71 rotate, and the pressing wheel 71 is tightened. The pressing wheel 71 slightly moves in the axial direction (left and right direction in FIG. 1) with the tightening, and the second spur gear 2
4 also moves a little in the axial direction with this. However, as described above, the movement causes the first spur gear 14 and the second spur gear 24 to move.
There is no trouble in meshing with.

After the tightening is completed, first, the first tool 1 is removed from the middle part 70, and then the second tool 2 is removed from the pressing wheel 71. It goes without saying that the pipe joint tightening tool 50 can be used not only for tightening but also for loosening.

Here, in the pipe joint tightening tool 50, the rotation axis Q of the operation bolt 11 intersects the center axis P of the target pipe as described above. Therefore, the tool 51 for turning the operation bolt 11 can be arranged along the target pipe.
Does not require much space for its operation. Therefore, it is possible to construct the work well without excavating it too much. If the rotation axis Q of the operation bolt 11 is shifted to the right or left in FIG. 2 and does not intersect with the center axis P of the target pipe, more operation space is required. In particular, if the shortest distance between the rotation axis Q and the central axis P becomes larger than the outer radius of the target pipe, the work pit needs to be digged very large. In the pipe joint tightening tool 50, the rotation axis Q and the central axis P intersect and the shortest distance is 0, so that is not the case.

Further, in the pipe joint tightening tool 50, the rotation axis Q of the operation bolt 11 is located within the range occupied by the joint scissors 10 with respect to the direction of the center axis P of the target pipe as described above. This also contributes to the construction without having to dug the work pit too much. If the rotation axis Q of the operation bolt 11 is further left in FIG.
If it is out of the range of 0, it is necessary to excavate the work pit accordingly. This is because the operation is performed from the right side in the figure in the case of FIG. If the rotation axis Q of the operation bolt 11 is
If it is farther to the right and out of the range of the joint scissors 10, there is no problem in the case of FIG. 1, but a similar problem occurs when the joint is attached to the empty end of the existing pipe. In the case of the pipe joint tightening tool 50, the rotation axis Q of the operation bolt 11 is within the range of the joint scissors 10. Therefore, such a case does not occur in any case.

As described in detail above, in the pipe joint tightening tool 50 according to the present embodiment, the operation bolt 11 directly receives an operation by a general tool such as a pipe wrench.
Are provided so that the rotation axis Q is orthogonal to the central axis P of the target pipe, and is located within the range occupied by the joint scissors 10 in the direction of the central axis P. Then, when the operation bolt 11 is rotated, the rotation is transmitted to the second tool 2, and the pressing wheel 71 is rotated to tighten or loosen. As a result, a pipe joint tightening tool 50 that can be installed without digging a work well around the target pipe so much is realized.

The present embodiment is merely an example, and does not limit the present invention. Therefore, naturally, the present invention can be variously modified and modified without departing from the gist thereof. For example, in the present embodiment, the rotation of the operation bolt 11 in the first tool 1 is changed in direction by the bevel gears 12 and 13 and then transmitted to the second tool. However, it is not limited to this.
As an example, the first bevel gear 12 may have a larger diameter, the second bevel gear 13 and the first spur gear 14 may be eliminated, and the second spur gear 24 may be replaced with a bevel gear so as to mesh with the first bevel gear 12. Good. Further, a ratchet mechanism may be interposed between the operation bolt 11 and the first bevel gear 12 (or another location) to facilitate the operation.

[0024]

As is apparent from the above description, according to the present invention, there is provided a pipe joint tightening tool capable of easily performing a construction work without digging a work well too much.

[Brief description of the drawings]

FIG. 1 is a diagram showing a state in which a pipe joint tightening tool according to an embodiment is attached to a target pipe, as viewed from a lateral direction with respect to an axial direction of the target pipe.

FIG. 2 shows a pipe joint tightening tool according to the embodiment shown in FIG.
It is the figure seen from the middle left.

FIG. 3 is a side view of a conventional pipe connection tool.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Joint scissors 11 Operation bolt 14 1st spur gear 24 2nd spur gear 50 Pipe joint tightening tool

Claims (4)

[Claims] 1. An operation unit capable of external rotation operation,
A first gear receiving rotation transmission from the operation unit; and a fixing unit for fixing the operation unit and the first gear to a target pipe, wherein a rotation axis of the operation unit is in the axial direction of the target pipe. In a state in which the operating portion and the first gear are fixed to the target pipe by the fixing portion, the rotation axis of the operating portion is fixed in a direction intersecting with the central axis direction of the target pipe. A pipe joint tightening tool for tightening or loosening a press wheel at a joint portion of a target pipe by rotation of the first gear. 2. An operation unit capable of external rotation operation,
A first gear receiving rotation transmission from the operation unit; and a fixing unit for fixing the operation unit and the first gear to a target pipe, wherein a first gear is provided between a rotation axis of the operation unit and a central axis of the target pipe. Is smaller than the outer radius of the target pipe, and when the operating part and the first gear are fixed to the target pipe by the fixing part, the rotation axis of the operating part intersects with the central axis direction of the target pipe. A pipe joint tightening tool fixed in a direction, and tightening or loosening a press ring at a joint portion of a target pipe by rotation of the first gear. 3. The pipe joint tightening tool according to claim 1, wherein a shortest distance between a rotation axis of the operation section and a central axis of the target pipe is smaller than an outer radius of the target pipe. Joint tightening tool. 4. One of claims 1 to 3
In the pipe fitting tightening tool described in (1), the fitting tool has a second gear that is attached to the press ring of the joint portion of the target pipe and meshes with the first gear in the attached state, and the second gear is rotated by rotation of the first gear. A pipe joint tightening tool, wherein a gear and a pressing wheel at a joint portion of a target pipe rotate together.