JP2010155309A - Drawing structure of embedded pin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drawing structure of an embedded pin easily and surely drawing the embedded pin from an installation object. <P>SOLUTION: The drawing structure of the embedded pin 2 includes: the embedded pin 2; a cylindrical body 3 covering the rear end side of the embedded pin 2; a drawing nut 4 fixed to the rear end of the cylindrical body 3; and a drawing bolt 5 inserted into the cylindrical body 3 while being screwed into the drawing nut 4. A male screw to be screwed with the drawing nut 4 is formed up to the distal end of the drawing bolt 5. A female screw led in the same direction as the male screw on the distal end side of the drawing bolt 5 is formed on the read end side of the embedded pin 2. A coupling member 6 which is screwed into the male screw on the rear end side of the embedded pin 2 and the male screw on the distal end side of the drawing bolt 5, and couples the embedded pin 2 with the drawing bolt 5 is inserted into the cylindrical body 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structure for pulling out an embedding pin for pulling out an embedding pin placed on a placement target.

  2. Description of the Related Art Conventionally, as an embedded pin pulling-out structure for pulling out an embedded pin placed on a placement target, one disclosed in Patent Document 1 is known. As shown in FIG. 3, the drawing structure of the embedded pin disclosed in Patent Document 1 is hit more than the rear end of the embedded pin 100 in order to cover the rear end side of the embedded pin 100 placed on the placement target T. A cylindrical body 101 extending far from the installation target T, a pulling nut 102 attached to the rear end of the cylindrical body 101, and being inserted into the cylindrical body 101 while being screwed to the pulling nut 102, and the embedded pin 100 And a pulling bolt 103 for pulling out the wire. The drawing bolt 103 has a normal diameter portion 103a and a small diameter portion 103b, and the female screw of the normal diameter portion 103a and the female screw of the small diameter portion 103b are led in opposite directions. That is, if the normal diameter portion 103a is the right lead, the small diameter portion 103b is the left lead, and if the normal diameter portion 103a is the left lead, the small diameter portion 103b is the right lead.

  Then, when pulling out the embedding pin 100, as shown in FIG. 4, the extraction nut 102 is rotated with a spectacle wrench, and the extraction bolt 103 is rotated or held in the opposite direction to the spectacle wrench with a spanner. At this time, the spectacle wrench is rotated in the direction in which the extraction bolt 103 is extracted from the cylindrical body 101. Then, the small-diameter portion 103b shown in FIG. 3 rotates in the direction of biting into the embedding pin 100. However, if the screw portions are already completely engaged with each other, the screwing hardly proceeds and the embedding pin 100 and The drawing bolt 103 further increases the fastening force. In this case, the force to rotate the embedded pin 100 becomes larger than the frictional resistance with the inner wall of the fitting hole to be placed, and the embedded pin 100 rotates while sliding on the inner wall of the fitting hole. To do. Thereby, the embedding pin 100 is moved integrally with the drawing bolt 103 in the left direction in the figure, and the embedding pin 100 is pulled out from the placement target T.

JP-A-3-281178

However, in the conventional embedded pin pulling-out structure described above, since a female screw is formed at the rear end portion of the embedded pin 100, the screw diameter of the small diameter portion 103b of the pulling bolt 103 to be screwed to this is increased. There was a problem in strength when the embedded pin 100 was pulled out. That is, when the embedding pin 100 is pulled out, if the tightening force of the placement target T to the embedding pin 100 is large, the screw thread of the small diameter portion 103b may be damaged and the embedding pin 100 may not be pulled out.
As a structure for pulling out the embedded pin that can solve this problem, a structure in which the pin side is a male screw and the jig side is a female screw is known. When the tightening force to the target embedding pin is large, a lot of labor is required for extraction.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide an embedded pin drawing structure that allows an embedded pin to be easily and reliably extracted from an object to be placed.

The present invention has been made as a means for solving such a problem.
The pull-out structure of the embedded pin according to the present invention includes an embedded pin placed on the placement target and a rear end of the embedded pin when pressed against the placement target to cover the rear end side of the embedded pin. A cylindrical body extending far from the placement target, a pulling nut fixed to the rear end of the cylindrical body, and being inserted into the cylindrical body while being screwed to the pulling nut, and the embedded pin A pull-out structure for an embedded pin comprising a pull-out bolt for pulling-out, wherein the pull-out bolt is formed with a male screw that engages with a pull-out nut up to the front end of the bolt, on the rear end side of the embedded pin Is formed with a male screw that leads in the same direction as the male screw on the front end side of the extraction bolt, and is engaged with the male screw on the rear end side of the embedding pin and the male screw on the front end side of the extraction bolt. The embedded pin and the Connecting members for connecting the vent bolt, characterized in that it is inserted into the cylindrical body.
In this invention, since the connecting member that is screwed into the male screw on the rear end side of the embedding pin and the male screw on the front end side of the extraction bolt and connects the embedding pin and the extraction bolt is inserted into the cylindrical body, Compared with the case where the rear end side of the pin is a female screw, the screw diameter can be increased, and the strength of the screw portion on the front end side of the drawing bolt is increased. Therefore, it is possible to pull out the embedded pin having a larger tightening force depending on the placement target. Further, when pulling out the pulling bolt, the pulling nut is rotated with a wrench or the like while restricting the rotation of the pulling bolt with a spanner or the like, so that the pulling operation can be performed with a small force by the lever principle. Therefore, the embedded pin can be easily and reliably extracted from the placement target.

In the pull-out structure for the embedded pin according to the present invention, the cylindrical body is a cylindrical body, and the cross-section of the connecting member is circular.
In this invention, the cross-section of the connecting member inserted into the cylindrical body is circular, and the connecting member can be smoothly rotated in the cylindrical body when the embedded pin is pulled out. Moreover, if the surface roughness of the outer peripheral surface of a connection member is made small, it will become still smoother.

In the embedded pin drawing structure according to the present invention, the outer diameter of the connecting member is larger than the outer diameter of the body portion of the embedded pin.
In this invention, when the outer diameter of the connecting member is increased, the diameter of the male screw on the rear end side of the embedding pin and the diameter of the male screw on the front end side of the extraction bolt can be increased. Therefore, when the embedded pin is pulled out, the embedded pin can be reliably pulled out without damaging the screw thread even if the tightening force to the embedded pin to be placed is large. When the outer diameter of the connecting member is increased, the inner diameter of the cylindrical body is increased accordingly.

Further, the embedded pin pulling structure of the present invention is such that a small diameter portion having a smaller diameter than the normal diameter portion is formed on the tip end side of the drawing bolt, and the normal diameter portion and the small diameter portion are mutually the same. A male screw led in the direction is formed.
In this invention, since it has a normal diameter part and a small diameter part to which the connecting member is screwed, and has two stages, the size (diameter) of the drawing bolt can be increased. For example, it is possible to use a bolt having a diameter larger than that of the connecting member. As a result, the diameter of the drawing nut increases, so that the workability when the drawing bolt and the drawing nut are relatively rotated is improved.

  In the embedded pin pull-out structure of the present invention, a connecting member that is screwed into the male screw on the rear end side of the embedded pin and the male screw on the front end side of the pull-out bolt is inserted into the cylinder. Therefore, the embedded pin can be easily and reliably extracted from the placement target.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative positions, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to that unless otherwise specified.

  FIG. 1 is an explanatory view showing an embodiment of an embedding pin drawing structure according to the present invention. As shown in the drawing, the embedded pin drawing structure 1 of the present embodiment includes an embedded pin 2 placed on the placement target T and a placement target to cover the rear end side of the placement pin 2. And a cylindrical body 3 extending farther from the placement target T than the rear end of the embedding pin 2 when pressed against T. The pulling-out structure 1 for the embedded pin of the present embodiment includes a pulling nut 4 attached to the rear end of the cylindrical body 3, and is inserted into the cylindrical body 3 while being screwed to the pulling nut 4. And a drawing bolt 5 for pulling out 2.

  A small-diameter portion 5b having a smaller diameter than the normal diameter portion 5a is formed on the distal end side of the drawing bolt 5. The normal diameter portion 5a and the small diameter portion 5b are formed with male screws that are lead in the same direction. The embedding pin 2 has a cylindrical main body 2a and a rear end 2b protruding from the rear end of the main body 2a. The rear end portion 2b is formed with a male screw that is led in the same direction as the male screw on the front end side of the drawing bolt 5. In the present embodiment, the rear end portion 2b, the normal diameter portion 5a, and the small diameter portion 5b are set to the right lead. Of course, the left lead may be unified. The shape of the embedding pin 2 is not particularly limited, and may be a tapered shape, for example.

  Then, the connecting member 6 that is screwed into the male screw on the rear end side of the embedding pin 2 and the male screw on the front end side of the extraction bolt 5 is connected to the cylindrical body 3 to connect the embedding pin 2 and the extraction bolt 5. Has been. The connecting member 6 has a circular cross section and is fitted to the cylindrical body 3. Therefore, when a rotational force is applied to the connecting member 6, the connecting member 6 rotates smoothly in the cylindrical body 3. Here, if the surface roughness of the outer peripheral surface of the connecting member 6 is reduced, the smoothness becomes even smoother. In the present embodiment, the inner diameter of the cylindrical body 3 and the outer diameter of the connecting member 6 are fitted, but a gap may be formed between the outer wall of the connecting member 6 and the inner wall of the cylindrical body 3. Moreover, in this embodiment, although the connection member 6 is cylindrical and the through hole is formed, it may not be a through hole.

Next, a drawing method of the embedded pin drawing structure 1 will be described.
First, the connecting member 6 is screwed into the rear end portion 2b of the embedding pin 2 in a state of being placed on the placement target T. (FIG. 2 (a) → FIG. 2 (b)). Note that a right lead male screw is formed at the rear end 2b, and a female screw is formed on the connecting member 6 in order to screw the male screw and the connecting member 6.

  Next, as shown in FIG. 2B, the combination of the cylindrical body 3, the drawing nut 4 and the drawing bolt 5 is brought close to the connecting member 6. Here, the drawing nut 4 is integrally provided at the rear end of the cylindrical body 3 by brazing or the like. Insertion of the extraction bolt 5 into the extraction nut 4 is performed by holding the cylindrical body 3 with one hand and rotating it while picking the head of the extraction bolt 5 with a finger of the other hand. .

  Next, when the connecting member 6 is fitted into the cylindrical body 3, a structure as shown in FIG. At this time, the tip of the drawing bolt 5 is in contact with the rear end surface of the connecting member 6, and the tip of the cylindrical body 3 is not in contact with the placement target T.

  Next, the drawing bolt 5 is rotated clockwise. Then, the drawing bolt 5 and the connecting member 6 are fitted, and the cylindrical body 3 comes into contact with the hit target T as shown in FIG.

  Further, as shown in FIG. 2 (e), while the rotation of the extraction bolt 5 is held by the spanner S, the extraction nut 4 is rotated by the spanner S while pressing the extraction nut 4 toward the contact target T side. Of course, the extraction nut 4 may be extracted using a wrench instead of a spanner. Then, the drawing bolt 5 moves to the right side (withdrawing direction) in the non-rotating state. With this movement, the connecting member 6 and the embedded pin 2 also move linearly. At this time, the connecting member 6 slides on the inner peripheral surface of the drawing nut 4. If the rotation of the extraction nut 4 is further continued, the embedded pin 2 is completely extracted from the hole Ta of the placement target T as shown in FIG.

  In the embedded pin pull-out structure of the above-described embodiment, the embedded pin 2 and the extraction bolt 5 are connected by being screwed into the male screw on the rear end side of the embedded pin 2 and the male screw on the front end side of the extraction bolt 5. Since the connecting member 6 is inserted into the cylindrical body 3, the screw diameter can be increased as compared with the case where the rear end side of the embedding pin 2 is a female screw, and the screw portion on the front end side of the pull-out bolt 5. Strength increases. Therefore, it is possible to pull out the embedded pin 2 having a greater tightening force due to the placement target T. Further, when pulling out the extraction bolt 5, the extraction nut 4 is rotated with a wrench or the like while restricting the rotation of the extraction bolt 5 with a spanner or the like, so that the extraction operation can be performed with a small force by the lever principle. . Therefore, the embedded pin 2 can be easily and reliably extracted from the placement target T.

  In the above-described embodiment, the example in which the outer diameter of the embedded pin 2 is equal to the outer diameter of the connecting member 6 has been described. However, the outer diameter of the connecting member 6 may be larger than the outer diameter of the embedded pin 2. . When the outer diameter of the connecting member 6 is made larger than the outer diameter of the embedded pin 2, the diameter of the male screw on the rear end side of the embedded pin 2 and the diameter of the male screw on the front end side of the extraction bolt 5 can be increased. Therefore, when the embedded pin 2 is pulled out, the embedded pin 2 can be reliably pulled out without damaging the screw thread even if the clamping force of the placement target T to the embedded pin 2 is large. When the outer diameter of the connecting member 6 is increased, the inner diameter of the cylindrical body 3 is increased accordingly.

  Moreover, in embodiment mentioned above, since it has the normal diameter part 5a and the small diameter part 5b to which the connection member 6 screws, it has two steps, Therefore The size (diameter) of the extraction | drawer bolt 5 is used. Can be bigger. For example, a bolt having a diameter larger than the diameter of the connecting member 6 can be used. Accordingly, the diameter of the extraction nut 4 is increased, so that the workability when the extraction bolt 5 and the extraction nut 4 are relatively rotated is improved.

  Further, in the above-described embodiment, the example in which the insertion bolt 5 is formed with the two-stage male screw of the normal diameter portion 5a and the small diameter portion 5b has been described. However, the insertion bolt 5 is formed from one male screw without a step. May be. In this case, a general-purpose screw can be used.

  In the embedded pin drawing structure of the present invention, the embedded pin can be easily and reliably extracted from the placement target. The pull-out structure of the embedded pin of the present invention can be applied when a member embedded in a wall such as metal, concrete, or mortar, ground, natural rock, or the like is pulled out. It can be applied to a wide range of fields such as architecture, civil engineering, automobiles (especially suspension parts), and rock climbing.

FIG. 1 is an explanatory view showing an embodiment of an embedding pin drawing structure according to the present invention. FIG. 2 is an explanatory view showing a process of pulling out the embedded pin placed on the placement target. FIG. 2A shows a state before the connecting member is screwed into the embedded pin. FIG. 2B shows a state before the connecting member is fitted into the cylindrical body. FIG. 2C shows a state in which the leading end of the drawing bolt is in contact with the rear end of the connecting member, and shows a state before the drawing bolt is picked with a finger and rotated to the right. FIG. 2D shows a state in which the extraction bolt is rotated clockwise and the extraction bolt is screwed to the connecting member. FIG. 2 (e) shows a state in which the extraction pin is pulled out by rotating the extraction nut while restricting the rotation of the extraction bolt. FIG. 2F shows a state in which the embedded pin is pulled out from the placement target. FIG. 3 is an explanatory view showing a conventional structure for pulling out an embedded pin. FIG. 4 is an explanatory view showing a method of extracting the embedded pin of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pull-out structure 2 Embedded pin 2a Body part 2b Rear end part 3 Cylindrical body 4 Pull-out nut 5 Pull-out bolt 5a Normal diameter part 5b Small diameter part 6 Connecting member 100 Embedded pin 101 Cylindrical body 102 Pull-out nut 103 Pull-out bolt 103a Normal diameter part 103b Small diameter part T Placed object Ta hole

Claims (4)

An embedded pin placed on the object to be placed;
A cylindrical body that extends farther from the placement target than the rear end of the embedded pin when pressed against the placement target to cover the rear end side of the implantation pin;
A drawing nut fixed to the rear end of the cylindrical body;
A drawing bolt that is inserted into the cylinder while being screwed to the drawing nut and for pulling out the embedded pin;
An embedded pin pull-out structure comprising:
The extraction bolt is formed with a male screw that engages with the extraction nut up to the tip of the bolt,
On the rear end side of the embedding pin, a male screw led in the same direction as the male screw on the front end side of the drawing bolt is formed,
A connecting member that is screwed into a male screw on the rear end side of the embedded pin and a male screw on the front end side of the extraction bolt and that connects the embedded pin and the extraction bolt is inserted into the cylindrical body. An embedded pin pullout structure characterized by   The pulling structure for an embedded pin according to claim 1, wherein the cylindrical body is a cylindrical body, and a cross section of the connecting member is circular.   2. The structure for pulling out an embedded pin according to claim 1, wherein an outer diameter of the connecting member is larger than an outer diameter of a main body portion of the embedded pin. A small-diameter portion having a smaller diameter than a normal diameter portion is formed on the tip side of the drawing bolt,
2. The pullout structure for an embedded pin according to claim 1, wherein the normal diameter portion and the small diameter portion are formed with male screws that are led in the same direction.

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