JP6710065B2 - Pipe insertion tool - Google Patents

Description

The present invention relates to a pipe insertion tool for inserting a tool inside a pipe.

As such an intra-tube inserter, a coil-shaped insert is known in which a metal band plate material is spirally formed so as to surround the tool (see Patent Document 1).
According to the pipe-insertion tool formed in the coil shape as described above, the insertion side end of the coil can be engaged with the stepped portion inside the pipe to get over the stepped portion inside the pipe. However, it is useful in that the tool can be inserted inside.

JP, 2013-134154, A (paragraph number "0028", "0029", refer to Drawing 4).

However, in the one described in Patent Document 1, the coil-shaped member is formed by a spiral in one direction. For this reason, it is possible to rotate the coiled in-tube insertion tool to the right or left to advance in the pipe, but it is improved in that it cannot get over the step difference inside the pipe depending on the rotation direction. There is room for
That is, since the coil-shaped member that constitutes the intraluminal insertion tool is a spiral in one direction, that is, right-handed or left-handed, it engages with the stepped portion inside the tube only by a rotating operation in either one of right rotation or left rotation, Although it is possible to get over the stepped portion in the pipe, there is a tendency that when it is rotated in the opposite direction, it spins idle and does not engage with the stepped portion in the pipe, and therefore cannot get over it.

The present invention intends to be able to change the direction to either the left or right side by the forward/reverse rotation of the leading conductor included in the insertion tool, and to overcome the stepped portion inside the tube by rotating the leading conductor to either the forward or reverse side. To do.

The pipe insertion tool for achieving the above object includes a tip conductor that can be inserted into a pipe, and a long rotation operation member that has flexibility and is connected to the rear side of the tip conductor. The leading conductor is provided with a tip rotating body that is rotatable with the rotation of the rotation operating member around the axis, and is formed on the outer peripheral side of the tip rotating body so as to project radially inward inside the pipe. A step portion that can be engaged with the rotation of the tip rotating body is formed with respect to the in-pipe step portion, and the step portion is a first step that engages with rotation of the tip rotating body in one direction. And a second step portion that engages with rotation in a direction opposite to the one direction, and the front conductor, together with the tip rotor located at the forefront end, is rearward of the tip rotor. The rotation operating member is rotatably supported by the shaft supporting member so that the front end portion is connected to the tip rotating body and is rotated at the base end side. It is characterized in that it is configured to be operable, and that the shaft support member is connected to a cylindrical body that is fitted onto the rotation operation member .

According to the above characteristic configuration, a step portion that is engageable with the in-tube step portion is formed on the outer peripheral side of the tip rotating body as the tip rotating body rotates, and the step portion is formed in one direction of the front conductor. A first step portion that engages with rotation and a second step portion that engages with rotation in a direction opposite to the one direction are provided.
Therefore, even if there is an in-pipe step portion that protrudes radially inward inside the pipe at a location where it comes into contact with either rotation of the forward conductor in one direction or the opposite direction, the first step portion , Or the second step portion engages with the in-tube step portion, and the tip end rotating body rides up and passes through the in-tube step portion.
As a result, it is possible to change the direction of the in-tube inserter on either the left or right side by the forward and reverse rotations of the tip rotating body, and it is easy to get over the stepped portion inside the tube by rotating the tip rotating body to either the forward or reverse side. There is an advantage that.
Further, according to the above characteristic configuration, the front conductor includes the tip rotating body located at the forefront end portion and the shaft support member located rearward of the tip rotating body, and the front end portion of the rotation operation member. The tip rotating body connected to is rotatably supported by a shaft support member. For this reason, only the distal end rotating body needs to be rotated by the rotating operation member, and it is not necessary to rotate the shaft supporting member or the cylindrical body supporting the shaft supporting member. As a result, the rotating operation of the tip rotator can be performed easily.

A further characteristic configuration of the in-pipe insertion tool is that a protrusion protruding forward is formed on the front surface side of the tip rotating body, and the first step portion, etc. are formed on one end side of the protrusion in the circumferential direction of the tip rotating body. The second step is formed on the end side, and the protrusion is provided within the range of 90 degrees or less in terms of the rotation angle of the tip rotating body.

According to the above characteristic configuration, since the step portion is provided within the range of 90 degrees or less in the rotation angle of the tip end rotating body, the step inside the pipe is different from the case where the step portion is provided in a range wider than this range. The step portion is easily engaged with the portion.

A further characteristic configuration of the in-tube inserter is that the tubular body is formed of a spiral body in which a wire is spirally wound and formed into a tubular shape, and the inside of the tubular body corresponding to the rear side of the leading conductor. The point is that the tool storage part is provided.

According to the above characteristic configuration, the tool accommodating portion can be formed by using the tubular body that supports the shaft support member, and the structure can be simplified, and the tubular body is configured by the spiral body. It is possible to obtain a structure having a high dynamic strength and excellent flexibility.

A further characteristic configuration of the in-pipe inserter is that the protruding amount of the step portion to the front side of the front surface of the tip rotating body excluding the step portion is between the spiral pitches of the wire rods forming the spiral body. It is set to the same level as the gap.

According to the above-mentioned characteristic configuration, the protrusion amount of the step portion is set to the same extent as the gap between the spiral pitches set in order to maintain the shape of the spiral body as a cylindrical body and the flexibility in a well-balanced manner. Therefore, the stepped portion can easily engage with the stepped portion in the pipe without any hindrance, but the existence of the stepped portion does not cause a large operation resistance when the tip rotating body rotates.

It is the whole side view showing the pipe insertion tool. It is a front view which shows the front-end|tip rotating body of a front conductor. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is a perspective view showing a tip rotary member. It is a side view which shows the pivotal support member of a front conductor. It is sectional drawing of piping in the state which inserted the pipe insertion tool. It is explanatory drawing which shows the operation principle of the insertion tool in a pipe. It is sectional drawing which shows the site|part which attached the tool to the tube insertion tool by the side view in a reference form. It is a front view showing a tip conductor of an insertion tool in a pipe in a reference form.

Hereinafter, an example of an embodiment of an intraductal insert according to the present invention will be described based on the description of the drawings.
FIG. 1 is a side view showing the entire intravascular insertion tool 1. 2 to 5 show the tip conductor 2, FIG. 2 is a front view of the tip rotor 20 in the tip conductor 2, FIG. 3 is a sectional view of the tip rotor 20, and FIG. 4 is a perspective view of the tip rotor 20. FIG. 5 is a side view showing the shaft support member 25 in the front conductor 2.

〔overall structure〕
The pipe insertion tool 1 is connected to the front conductor 2 having a diameter slightly smaller than that of the pipe so that it can be inserted into the pipe such as a gas pipe, and is flexible and connected to the rear side of the front conductor 2. And a long shaft-like operation body 3 (corresponding to a rotation operation member). The outer side of the shaft-shaped operating body 3 is covered with a spiral body 4 (corresponding to a cylindrical body) which is formed by spirally winding a wire rod into a cylindrical shape.

The wire rod forming the spiral body 4 is a flat-plate spring steel material, and is formed into a tubular shape by spirally winding the wire rod. That is, the spiral body 4 is formed in a coil shape, is flexible, and can be bent in an arbitrary direction by elastic deformation. Lubrication plating is applied to the surface of the wire material if necessary.

The front portion of the spiral body 4 is a large diameter portion 40 in which the winding diameter of the wire is larger than that of the other portions, and a tool (not shown) is housed in the space inside the large diameter portion 40. In a portion of the spiral body 4 that continues to the rear side of the large diameter portion 40, a small diameter portion 42 having a small winding diameter of the wire is formed via a tapered portion 41 having a gradually decreasing winding diameter of the wire.

The tools accommodated in the space inside the large diameter portion 40 of the spiral body 4 include an inspection camera, a gyroscope for measuring the arrangement angle and position of the pipe, or an ultrasonic probe for measuring the wall thickness of the pipe. Various sensors such as tentacles are used. The tool wiring 43 and the tool operating linear body 44 are housed in the tapered portion 41 and the small diameter portion 42 (see FIG. 8 ).

The large-diameter portion 40 has a coiled shape in which a front portion of the large-diameter portion 40 is formed by spirally forming a wire rod in the longitudinal direction of the spiral body 4 while leaving a gap s1, and a rear portion of the large-diameter portion 40 spirals the wire rod in the longitudinal direction of the spiral body 4 without a gap. It is formed in a coil shape. The spiral pitch p1 of the wire rod in the front portion of the large diameter portion 40 can be appropriately set according to the bending performance required for the large diameter portion 40. The small-diameter portion 42 has a coil shape in which the wire is spirally formed in the longitudinal direction of the spiral body 4 without any gap.

[Leader conductor]
The front conductor 2 provided at the front end of the pipe insertion tool 1 will be described.
As shown in FIGS. 1 to 5, the front conductor 2 includes a tip rotating body 20 located at the foremost end portion and a shaft support member 25 located rearward of the tip rotating body 20. The tip rotating body 20 and the shaft-shaped manipulating body 3 are formed of synthetic resin materials.
A shaft-shaped operating body 3 made of a metal wire is connected to the tip-end rotating body 20, and the tip-end rotating body 20 rotates around the axis p0 of the shaft-like operating body 3 by a rotational operation of the shaft-like operating body 3. It is rotated by.

The shaft-shaped operation body 3 penetrates the shaft support member 25 located on the rear side of the tip rotation body 20, and the front end portion thereof is connected to the tip rotation body 20. The shaft-shaped operating body 3 penetrating the shaft supporting member 25 is supported by the shaft supporting member 25 so as to be relatively rotatable.
Therefore, the tip rotating body 20 connected to the front end portion of the shaft-shaped manipulating body 3 passes through the shaft-shaped manipulating body 3 around the same shaft center as the shaft center p0 of the shaft-manipulating body 3 and the shaft support member. It is configured to be rotatable relative to 25.

Specifically, as shown in FIGS. 2 to 4, the tip rotating body 20 includes a disc-shaped rotating plate portion 21 and a boss portion 22 extending to the rear side of the rotating plate portion 21. ing. A connecting hole 22a is formed on the rear side of the center of the boss portion 22 and a screw hole 22b is formed from the side of the boss portion 22 so as to communicate with the connecting hole 22a.
The front end portion of the shaft-shaped operating body 3 is inserted into the connecting hole 22a, and the fixing screw 22c is screwed into the screw hole 22b, so that the shaft-shaped operating body 3 is connected to the distal end rotating body 20 so as to rotate integrally. be able to.

On the rotary plate portion 21 of the distal end rotary body 20, a protrusion portion 23 is formed in the vicinity of the outer peripheral portion of the rotary plate portion 21 so as to project more frontward than the front surface 21A of the rotary plate portion 21.
The protrusion 23 is provided with step portions 24 on both sides in the circumferential direction of the rotary plate portion 21. Of the step portion 24, the first step portion 24a existing on one side in the circumferential direction and the second step portion 24b existing on the other side in the circumferential direction are within a range of 90 degrees or less in rotation angle of the rotary plate portion 21. In this embodiment, the first step portion 24a and the second step portion 24b are provided within a range of about 30 degrees.
The first step portion 24a and the second step portion 24b stand upright so as to form a rising wall surface that intersects the front surface 21A of the rotary plate portion 21 at an angle of approximately 90 degrees.

In addition, the protrusions 23 having the stepped portions 24 have a protrusion amount d1 from the front surface 21A of the rotary plate portion 21 to a front side at a position excluding the range where the protrusions 23 are present. Is set to be approximately the same as the clearance s1 between the spiral pitches p1 and p1.
The protrusion amount d1 of the protruding portion 23 set in this way does not cause a large operation resistance when the tip rotating body 20 rotates, and as shown in FIG. 6, the tip rotating body 20 exists in the pipe. The amount of protrusion is appropriate for the step portion 24 of the projection 23 to easily engage with the pipe portion on the small diameter side in the pipe when the pipe step over the pipe step portion.

The shaft support member 25 arranged on the rear side of the tip rotating body 20 is configured as shown in FIG.
In other words, the overall shape is a short cylinder, and the through hole 26 is provided in the center thereof. The shaft-shaped operation body 3 is inserted into the through hole 26 and supported so as to be relatively rotatable.
On the outer peripheral side, a spiral groove 27 into which the wire rod at the front end of the large diameter portion 40 of the spiral body 4 can be screwed is formed. By connecting the front end portion of the spiral body 4 to the spiral groove 27, the shaft support member 25 is fixed in position by the spiral body 4, and the distal end rotary body 20 connected to the shaft-shaped operating body 3 is relatively rotatable. It has the function of supporting.

[How to use the insertion tool in the tube]
The in-tube inserter 1 thus configured is used as follows.
First, a tool (not shown) is provided between the shaft-shaped operating body 3 of the in-tube inserter 1 and the large-diameter portion 40 of the spiral body 4 fitted on the outside thereof.
After that, the shaft-shaped operation body 3 is inserted into the connection hole 22a of the front tip rotary body 20 through the through hole 26 of the shaft support member 25 of the front conductor 2 to be connected. The front end portion of the spiral body 4 is screwed into a spiral groove 27 formed in the outer peripheral portion of the shaft support member 25 of the front conductor 2 to connect the shaft support member 25 and the spiral body 4.

In the pipe 5 shown in FIG. 6, the front conductor 2 of the in-tube inserter 1 and the large diameter portion 40 of the spiral body 4 are inserted from the upper end opening 50a of the straight pipe 50, and further the small diameter portion 42 of the succeeding spiral body 4 is inserted. The front portion of the in-tube insertion tool 1 is caused to enter the location where the first elbow pipe 51 is present by pushing in with holding it.

The pipe insertion tool 1 is further pushed in, and the front portion of the spiral body 4 is inserted while being curved along the inner surface of the first elbow pipe 51. At this time, since the wire rod in the front portion is formed in a spiral shape with a gap s1 provided in the longitudinal direction, bending deformation can be absorbed in the gap s1. Moreover, since the space is secured between the shaft-shaped operating body 3 and the spiral body 4 by interposing the shaft support member 25, the tool inside the space does not hinder the bending of the spiral body 4.

When the in-pipe inserter 1 is further pushed in, as shown in FIG. 6, the tip end rotating body 20 of the leading conductor 2 is stepped by the end portion of the second elbow pipe 52 that is internally fitted to the terminal end side of the first elbow pipe 51. (Corresponding to the step inside the pipe). From this state, when the axial operating body 3 is rotated to push the intra-tube inserter 1 while rotating the distal end rotating body 20, the stepped portion 24 existing on the protruding portion 23 of the distal end rotating body 20 causes the second elbow to move. By engaging with the step portion 52a at the end of the pipe 52, the tip end rotating body 20 rotates so as to get over the step portion 52a formed by the second elbow pipe 52.

In this way, by further pushing the in-pipe insertion tool 1 in a state in which the distal end rotating body 20 has passed over the step portion 52a at the end of the second elbow pipe 52, the in-pipe insertion tool 1 is further intruded into the inner side of the pipe. , The pipe connected to the other end of the second elbow pipe 52, or the like, can be directed to the location where the next pipe step portion exists, and the subsequent pipe step portion can be overcome by the same procedure as above.

Next, a description will be given of an operation mode when the in-tube inserter 1 is used by inserting it into the T-shaped tube 6.
FIG. 7 shows the principle of operation when the in-tube insertion tool 1 is inserted into the T-shaped tube 6 and operated.
In the T-shaped tube 6 shown on the left side in the drawing, the axial operating body is inserted at the time when the in-tube insertion tool 1 is inserted into the T-shaped tube 6 and the tip conductor 2 reaches the branch point of the T-shaped tube 6. 3 shows a state in which 3 is rotated clockwise.
Further, in the T-shaped tube 6 shown on the right side of the drawing, when the tube insertion tool 1 is inserted into the T-shaped tube 6 and the tip conductor 2 reaches the branch point of the T-shaped tube 6, the axial operation is performed. The figure shows a state in which the body 3 is rotated counterclockwise.

In the T-shaped tube 6 described on the left side, the shaft-shaped operating body 3 traveling in the vertical tube 60 is rotated clockwise. However, the rotational operation force acts on the flexible shaft-shaped operation body 3 so that the acting force F1 in the leftward direction opposite to the rotation direction acts, and the shaft-shaped operation body 3 moves. It moves along the left wall surface of the vertical pipe 60.
However, since the front conductor 2 located on the front end side of the shaft-shaped manipulating body 3 advances in a state where the shaft-shaped manipulating body 3 is held so as to be located near the center of the vertical pipe 60, At a close position, an acting force F2 acts on the axial operating body 3 in a direction away from the left pipe wall surface of the vertical pipe 60. Therefore, at the time when the leading conductor 2 reaches the intersection of the vertical pipe 60 and the horizontal pipe 61, the axial operating body 3 moves from the position close to the left pipe wall surface of the vertical pipe 60 to the vertical pipe as shown in the figure. It is in a tilted posture, which is separated from the position near the center of 60 and heads diagonally to the right.
Further, when the front conductor 2 advances in a direction traversing the horizontal pipe 61 along the extension direction of the vertical pipe 60, the tip rotating body 20 of the front conductor 2 rotating rightward rolls along the longitudinal direction of the horizontal pipe 61, and further. An acting force F3 that tilts the axial operating body 3 to the right acts.
In this way, the pipe insertion tool 1 in which the shaft-shaped operation body 3 is rotated to the right changes the direction to the right at the branch point of the T-shaped pipe 6.

In the T-shaped tube 6 described on the right side, the shaft-shaped operating body 3 traveling in the vertical tube 60 is rotated counterclockwise. However, the rotational operation force acts on the flexible shaft-shaped operation body 3 so that the acting force F1 acts in the rightward direction opposite to the rotation direction, and the shaft-shaped operation body 3 moves. It moves along the right wall surface of the vertical pipe 60.
However, since the front conductor 2 located on the front end side of the shaft-shaped manipulating body 3 advances in a state where the shaft-shaped manipulating body 3 is held so as to be located near the center of the vertical pipe 60, At a close position, an acting force F2 acts on the axial operating body 3 in a direction away from the wall surface of the right pipe of the vertical pipe 60. Therefore, at the time when the leading conductor 2 reaches the intersection of the vertical pipe 60 and the horizontal pipe 61, the axial operating body 3 moves from the position close to the wall surface of the right pipe of the vertical pipe 60 to the vertical pipe as shown in the figure. It is in an inclined posture, which is separated from the portion near the center of 60 and heads diagonally to the left.
Further, when the front conductor 2 advances in the direction traversing the horizontal pipe 61 along the extension direction of the vertical pipe 60, the tip rotating body 20 of the front conductor 2 rotating counterclockwise rolls along the longitudinal direction of the horizontal pipe 61, and further. An acting force F3 that tilts the axial operating body 3 to the left acts.
In this way, the tube insertion tool 1 in which the shaft-shaped operation body 3 is rotated counterclockwise changes its direction to the left at the branch point of the T-shaped tube 6.

In the case where a step portion (not shown) (corresponding to an in-tube step portion) is present in the horizontal pipe 61 after the direction is changed at the branch point of the T-shaped pipe 6, when the step portion 52a of the second elbow pipe 52 is crossed over. You can get over it in the same way. That is, regardless of whether the shaft-shaped operating body 3 is rotated to the right or to the left, the tip rotating body 20 of the front conductor 2 has a stepped portion that engages with the in-tube stepped portion in either the left or right rotation direction. Since the portion 24 is provided, it is possible to get over the stepped portion in the pipe without any trouble.

[Other Embodiment 1]
In the above-described embodiment, as the protrusion 23 provided with the step portion 24, the single protrusion 23 protruding toward the front side of the front surface 21A of the rotary plate portion 21 of the tip rotor 20 is provided. However, the structure is not limited to this.
For example, it may have a shape in which a plurality of protrusions 23 protrude toward the front side of the front surface 21A of the rotary plate portion 21, and the number of the protrusions 23 is not particularly limited. Even when there are a plurality of protrusions 23, it is desirable that the range in which the protrusions 23 are formed is provided within a range of 90 degrees or less in terms of the rotation angle of the rotary plate portion 21 in the distal end rotor 20.
Further, in the embodiment, the cross-sectional shape of the protrusion 23 in the direction along the front surface 21A of the tip rotating body 20 is formed into a shape close to a rectangle, but the shape is not limited to this, and a polygonal shape, a columnar shape, or the like. The cross-sectional shape may be appropriately curved.
Further, the protrusions 23 formed on the front surface 21A of the rotary plate portion 21 are not limited to those formed in the range including the outer peripheral edge of the rotary plate portion 21, and are slightly closer to the center side in the radial direction than the outer peripheral edge. It may be formed in.
Other configurations may be the same as those of the above-described embodiment.

[Other embodiment 2]
In the above-described embodiment, as the protrusion 23 having the step portion 24, the one having a structure protruding toward the front side from the front surface 21A of the rotary plate portion 21 of the tip rotary body 20 is illustrated, but the structure is not limited to this. It is not something that can be done.
For example, although not shown, a cutout portion having a shape recessed radially inward may be formed on the outer peripheral side of the rotary plate portion 21, and the stepped portion 24 may be formed by the cutout portion. In this case, one end portion of the cutout portion in the circumferential direction of the rotary plate portion 21 constitutes the first step portion 24a, and the other end portion opposite to this in the circumferential direction constitutes the second step portion 24b. ..
Then, both the first step portion 24a formed at one end of the cutout portion and the second step portion 24b formed at the other end thereof are substantially orthogonal to the peripheral surface of the rotary plate portion 21. It is desirable that the structure provided with the wall surface in the line direction facilitates engagement with the stepped portion in the pipe.
Also in this structure, the range in which the first step portion 24a and the second step portion 24b are formed is preferably within the range of 90 degrees or less in terms of the rotation angle of the rotary plate portion 21.
Other configurations may be the same as those of the above-described embodiment.

[ Reference Form 4]
In the above-described embodiment, the tip conductor 2 has a structure in which only the tip rotor 20 is rotationally operated by using the tip rotor 20 that is rotationally operated and the shaft support member 25 that is not rotationally operated. Another structure is illustrated .
For example, as shown in FIGS. 8 and 9, as a rotary operation member for rotationally operating the front conductor 2 , although not within the scope of right of the present application , the spring steel material is used instead of the shaft-shaped operation body 3 in the same manner as the spiral body 4 described above. A cylindrical operating body 30 formed in a cylindrical shape by spirally winding a wire made of may be used.
In this case, the tip conductor 2 is not separated into the tip rotor 20 and the shaft support member 25, but a structure in which these are integrated, that is, as shown in FIG. 9, a ring-shaped tip rotor 28. A spiral groove 27 into which the front part of a spiral tubular operating body 30 is screwed is formed on the outer peripheral side of the, and a projection having step portions 24 on both sides in the rotation direction on the front side of the tip rotating body 28. The part 23 is formed.

In this structure, since the tip end rotating body 28 is fixed to the tubular operating body 30, the tip end rotating body 28 and the tubular operating body 30 are rotated as a whole, and the tip end rotating body 28 of the front conductor 2 is rotated. It is necessary to determine the traveling direction and rotate the whole body to get over the step inside the pipe.
According to this structure, since the tip rotating body 28 is formed in a ring shape and the front side is open, the interior tool 7 is equipped with a camera for photographing the front side, a gas bag for projecting to the front side, or the like. Easy to do.
Other configurations may be the same as those of the above-described embodiment.

[Fifth Embodiment]
In the above-described embodiment, the structure in which the cylindrical body constituted by the spiral body 4 is provided outside the shaft-shaped operation body 3 as the rotation operation member is exemplified, but the structure is not limited to this. For example, as the tubular body, a flexible synthetic resin tubular member other than the spiral body 4 may be used, or the tubular body may not be used at all.
Other configurations may be the same as those of the above-described embodiment.

[Sixth Embodiment]
In the above embodiment, the tip rotary body 20 and the shaft-shaped manipulating body 3 are exemplified by a structure made of a molded product of a synthetic resin material, but the structure is not limited to this. For example, the tip rotating body 20 and the shaft-shaped operating body 3 may be made of a metal material.
Other configurations may be the same as those of the above-described embodiment.

[Seventh Embodiment]
In the above-described embodiment, the shaft support member 25 has a through hole 26 through which the shaft-shaped operation body 3 is inserted in the central portion and a spiral groove 27 on the outer peripheral side, and has a short cylindrical shape. However, the structure is not limited to this.
For example, although not shown, a through hole 26 through which the shaft-shaped operating body 3 is inserted is provided in a hub portion at a central position, and between the hub portion and a ring portion constituting the outer peripheral surface of the shaft support member 25, front and rear The structure may include a space that communicates in the direction. With this configuration, some tool-related member can be arranged through the space communicating in the front-rear direction, and the front can be visually recognized.
Further, the connection between the shaft support member 25 and the tubular body is not limited to the connection between the spiral groove 27 and the spiral body 4, and it is possible to employ an appropriate connection means.
Other configurations may be the same as those of the above-described embodiment.

Note that the configurations disclosed in the above-described embodiments (including other embodiments) can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction arises. The embodiment disclosed in 1 is an exemplification, and the embodiment of the present invention is not limited to this, and can be appropriately modified within a range not departing from the object of the present invention.

INDUSTRIAL APPLICABILITY The pipe insert according to the present invention is not limited to gas pipes, and can be used as a pipe insert for inserting into pipes such as electric wire pipes, air conditioning pipes, etc. where the inside is hollow.

2 Lead conductor 3 Rotation operation member 4 Spiral body 20 Tip rotation body 23 Projection portion 24 Step portion 24a First step portion 24b Second step portion 25 Shaft support member 30 Cylindrical operation body d1 Projection amount p1 Spiral pitch s1 Gap

Claims (4)

A leading conductor that can be inserted inside the pipe,
A long rotating operation member having flexibility and connected to the rear side of the leading conductor,
The tip conductor includes a tip rotating body that is rotatable with the rotation of the rotary operation member around its axis,
On the outer peripheral side of the tip rotator, a step portion that is engageable with the rotation of the tip rotator is formed with respect to a pipe step portion that is formed to project radially inward inside the pipe,
The step portion includes a first step portion that engages with rotation of the distal end rotating body in one direction, and a second step portion that engages with rotation in a direction opposite to the one direction ,
The front conductor includes the tip rotating body located at the foremost end portion, and a shaft support member located rearward of the tip rotating body,
The rotation operating member is rotatably supported by the shaft supporting member in a relatively rotatable manner, its front end portion is connected to the tip rotating body, and is configured to be rotatable on the base end side.
An in- pipe inserter in which a tubular body fitted to the rotation operation member is connected to the shaft support member . A protrusion protruding forward is formed on the front surface side of the tip rotating body, the first step portion is formed on one end side of the protrusion portion in the circumferential direction of the tip rotating body, and the second step portion is formed on the other end side. The in-pipe insertion tool according to claim 1, wherein the protrusion is provided within a range of a rotation angle of the distal end rotating body of 90 degrees or less. The cylindrical body is configured by a spiral body formed by winding a wire rod in a spiral shape, and a tool accommodating portion is provided inside the cylindrical body corresponding to a rear side of the shaft support member. Item 1. The in-tube inserter according to Item 1 or 2. The amount of protrusion of the step portion to the front side of the front surface of the tip rotating body excluding the step portion is set to be approximately the same as the gap between the spiral pitches of the wire rods forming the spiral body. Item 3. A tube insertion tool according to item 3.

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