JP2016014466A - Spiral insert - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a tail portion of a present spiral insert is hard to be removed.SOLUTION: A spiral insert includes a spiral portion 1, a tail portion 2, and a side direction notch 3. The spiral portion 1 is formed in a hollow cylindrical spiral structure. The spiral portion 1 includes a first end 1a and a second end 1b. The tail portion 2 includes a third end 2a and a fourth end 2b. The third end 2a of the tail portion 2 connects with the second end 1b of the spiral portion 1, and the fourth end 2b of the tail portion 2 is projected at a hollow part of the spiral portion 1. The side direction notch 2 is opened at a connecting part of the tail portion 2 and the spiral portion 1, and the side direction notch 3 is configured so as to be positioned on the inner side of the folding of the connecting part.

Description

  The present invention relates to a spiral insert, and more particularly to a spiral insert for avoiding collapse when a screw thread of a bolt is screwed into a screw hole.

  FIG. 16 is a bottom view of a conventional spiral insert. Referring to FIG. 16, the conventional spiral insert 8 is formed by continuously winding a single wire, and the spiral insert 8 includes a spiral portion 81 and a tail portion 82. The spiral portion 81 is a portion of a hollow cylindrical spiral structure formed by winding the wire. The tail portion 82 is continuous with the end of the spiral portion 81 and extends toward the center of the spiral portion 81. The spiral insert 8 configured in this manner gradually sandwiches the tail portion 82 of the spiral insert 8 with a tool and screwes the spiral portion 81 of the spiral insert 8 into the screw hole of the base seat to be applied. The bolt can be used for screwing into the spiral part 81 by screwing into the screw.

  Further, by providing the concave portion 83 on the bottom end surface of the spiral portion 81, the portion where the concave portion 83 is provided in the spiral portion 81 is formed as a portion having a relatively weak strength structurally. Thus, after the spiral portion 81 of the spiral insert 8 is screwed into the corresponding screw hole by a tool, an impact force is applied to the tail portion 82, so that the spiral portion 81 is torn in the recess portion 83. And the spiral portion 81 can be separated and the tail portion 82 can be removed.

  However, since the recess 83 of the spiral insert 8 in such a conventional spiral insert is installed on the bottom end surface of the spiral portion 81, the impact force applied to the tail portion 82 is from the surface where the recess 83 is not opened. As a result, the spiral portion 81 hardly breaks in the concave portion 83, and the tail portion 82 must be impacted with a large force or several times during the operation, which makes it difficult to operate. Further, when the spiral insert 8 is used for a screw hole having a blind hole shape, there is a problem that it is difficult to take out the torn tail portion 82.

  In addition, the conventional spiral insert 8 described above does not include a structure for “removal”, so that after the tail portion 82 of the spiral insert 8 is removed, the spiral insert 8 corresponds. When the spiral insert 8 locked in the screw hole is to be replaced (for example, the spiral insert 8 locked in the screw hole is rusted). Etc.), there is a problem that the replacement becomes impossible.

  FIG. 17 is a bottom view of another conventional spiral insert. Referring to FIG. 17, the conventional spiral insert 9 is continuously wound with a single wire, and the spiral insert 9 includes one spiral portion 91 and two recesses 92. The spiral portion 91 is a portion of a hollow cylindrical spiral structure formed by winding a wire, and a lead angle 911 is provided at the end of the spiral portion 91, and the head end of the spiral portion 91 is similarly formed. One of the recesses 92 is provided at the end of the spiral portion 91, and the other recess 92 is provided at the head end of the spiral portion 91. The opening of each concave portion 92 is formed so as to face the center of the spiral portion 91, and each concave portion 92 includes a contact peripheral wall 921. The contact peripheral wall 921 is formed so as to be orthogonal to the inner peripheral edge of the spiral portion 91.

  Thereby, when using this conventional spiral insert 9, the tool is engaged with the recess 92 provided at the end of the spiral portion 91 and is brought into contact with the contact peripheral wall 921 of the recess 92. Then, the spiral portion 91 of the spiral insert 9 is gradually screwed into the screw hole of the base seat, and then screwed into the spiral portion 91 with a bolt. Then, the tool is engaged with the recess 92 provided at the head end of the spiral portion 91 and then brought into contact with the contact peripheral wall 921 of the recess 92, so that the spiral portion 91 of the spiral insert 9 is gradually adjusted. Retreat from the screw hole in the seat.

  However, in such a conventional spiral insert 9, the spiral insert 9 screwed into the screw hole can be retracted by rotating in the reverse direction. By driving the spiral portion 91 only from the contact peripheral wall 921 having a small area, it can be screwed into or retracted from the corresponding screw hole, and the portion of the spiral portion 91 provided with the recess 92 is structurally strong. Is formed as a relatively weak part, the driving force applied to the helical insert 9 by the tool is very limited. Therefore, since the spiral insert 9 can only be screwed into a screw hole whose inner diameter is the same as or slightly smaller than the outer diameter of the spiral insert 9, a very small diameter is formed between the spiral insert 9 and the screw hole. It has only a bearing force in the direction.

  As described above, since the connection between the spiral insert 9 and the screw hole is not stable, the bolt inserts the spiral insert 9 into a deeper portion of the screw hole in the process of screwing the bolt into the spiral insert 9. Not only cannot the bolts be inserted, but the bolts cannot be smoothly connected to the helical insert 9. Further, when the bolt is withdrawn from the spiral insert 9, the spiral insert 9 is also withdrawn from the screw hole together, and the operation of screwing the spiral insert 9 into the screw hole must be performed again. Therefore, there is a problem that it is very inconvenient in use.

  Further, the spiral portion 91 of the spiral insert 9 has a lead angle 911 at the end and the head end of the spiral portion 91 in order to avoid frictional resistance between the inner peripheral wall of the screw hole during the screwing or withdrawal process. By being provided, it is possible to ensure that the spiral insert 9 is smoothly screwed into and out of the corresponding screw hole by the tool. However, since the two lead angles 911 provided at the end of the spiral portion 91 and the head end cannot be formed without extra processing, there is a problem that the manufacture of the spiral insert 9 is relatively complicated. It was.

  In "Method for producing spiral coil insert" described in Japanese Patent No. 4018844 (Patent Document 1), by installing one notch for each step in one wire, and further performing a winding operation of the wire, A tongue is formed at one end of the wire, and adjacent to one notch in the wire, and then wound around to form a spiral, and then cut the wire to cut the spiral between the cutting site and the next notch. Therefore, a tongue-like spiral insert similar to the conventional spiral insert 8 described above can be manufactured. In addition, two heads and two recesses that are opposed to each other in a single wire are installed, and the wire is further wound, and then the wire is cut between two adjacent heads. By doing so, a tongue-less spiral insert similar to the conventional spiral insert 9 described above can be manufactured.

  18a and 18b, the tongue-like spiral inserts 8 ′ and 8 ″ that can be manufactured by the manufacturing method described in the above-mentioned patent can be selectively replaced with the notch N of the spiral insert 8 with the tongue. It can be positioned at the bottom end face of the ′ or can be formed to face the tongue of the helical insert with tongue 8 ″. However, the two tongue-like spiral inserts 8 ', 8' 'still have the disadvantages that the above-mentioned tongue is difficult to cut and cannot be removed.

Japanese Patent No. 4018844

  The present invention was invented in view of such problems, and the object of the present invention is to make it easier to screw the spiral part into the screw hole by the tail part connected to the end of the spiral part. It is an object of the present invention to provide a helical insert that can ensure that the screw hole and the screw hole are tightly coupled and can be easily removed and removed after being coupled to the screw hole.

  A second object of the present invention is a spiral shape that can be taken out in the reverse direction after being screwed into a screw hole, and does not require the formation of a lead angle on the peripheral edge of the cross section of the spiral portion, thereby simplifying the manufacturing process. To provide an insert.

  To achieve the above objective, the helical insert according to the present invention comprises a helix, a tail and a lateral notch. The spiral portion is formed in a hollow cylindrical spiral structure, and the spiral portion includes a first end and a second end. The tail includes a third end and a fourth end, the third end of the tail is connected to the second end of the spiral, and the fourth end of the tail is disposed in a hollow portion of the spiral. . The lateral cutout is provided at a connecting portion of the tail portion and the spiral portion, and is disposed inside the bent portion of the connecting portion.

  The helical insert according to the present invention can also be formed by winding a single wire. The wire includes a head end and a distal end, the head end of the wire becomes the first end of the spiral portion, and the end of the wire becomes the fourth end of the tail portion. The side notch includes a first wall and a second wall, and the first wall and the second wall include a separation end and a connection end, respectively. The connecting end of the first wall and the second wall is connected to each other, and the wire diameter of the wire is formed to be a minimum value at the connecting end of the first wall and the second wall.

  The spiral insert according to the present invention includes a central axis in the spiral portion, the wire has an inner diameter end edge and an outer diameter end edge in the spiral portion, and a connecting surface is a connecting portion of the tail portion and the spiral portion. The connecting surface may pass through the central axis of the spiral portion and be orthogonal to the outer diameter edge, and the first wall of the lateral cutout may be formed to pass through the connecting surface.

  The spiral insert according to the present invention may be formed such that the separation end of the first wall passes through the connection surface, and the connection end of the first wall and the second wall are all located at the tail. it can. The connecting end of the first wall and the second wall passes through the connecting surface, the separating end of the first wall is disposed in the spiral portion, and the separating end of the second wall is disposed in the tail portion. It can also be formed. Further, the first wall may be disposed on the connecting surface, and the separation end of the second wall may be disposed on the tail.

  In the spiral insert according to the present invention, the spiral portion includes a central axis, the wire has an inner diameter end edge and an outer diameter end edge in the spiral portion, and a connecting surface is connected to the tail portion and the spiral portion. The connecting surface passes through the central axis of the spiral part and is perpendicular to the outer edge, the second wall of the side notch is positioned on the connecting surface, and the first wall is separated. The end may be formed to be positioned in the spiral portion.

  In addition, the spiral insert according to the present invention is provided with an engaging recess, and the engaging recess is formed so as to be close to the first end of the spiral portion and far from the second end of the spiral portion. And the said engagement recessed part can also be established in the internal-diameter end edge of the said wire.

  In the spiral insert according to the present invention, the engaging recess may include a hook-shaped peripheral wall and a guiding peripheral wall. Both ends of the hook-shaped peripheral wall and the guide peripheral wall are positioned at the inner diameter end edge of the wire, and the hook-shaped peripheral wall extends from the inner diameter end edge of the wire toward the outer diameter end edge. The other ends of the drawing wall are connected to each other. The reference plane passes through the radial cross section of the wire and one end where the hook-shaped peripheral wall is located at the inner edge, and the connecting portion of the hook-shaped peripheral wall and the guide peripheral wall is the head end of the reference surface and the wire Located between.

    According to the spiral insert of the present invention, it is easy to screw the spiral part into the screw hole by the tail part connected to the end of the spiral part, and it is possible to ensure a tight coupling between the spiral part and the screw hole, and to couple to the screw hole. There is an advantage that it can be easily removed and taken out by the tail after being done.

  Further, according to the spiral insert of the present invention, it is possible to take out by rotating in the reverse direction after screwing into the screw hole, and it is not necessary to form a lead angle at the peripheral edge of the cross section of the spiral portion. There is an advantage that can be simplified.

FIG. 1 is an explanatory view of a three-dimensional structure when the bottom of a spiral insert according to the first embodiment of the present invention is directed downward. FIG. 2 is an explanatory view of a three-dimensional structure when the bottom of the spiral insert according to the first embodiment of the present invention is directed upward. FIG. 3 is an explanatory view of a cross-sectional structure of the side surface of the base seat to which the spiral insert according to the first embodiment of the present invention is to be coupled. FIG. 4 is an explanatory diagram of a planar structure along the line II in FIG. FIG. 5 is an explanatory view when the spiral insert according to the first embodiment of the present invention is screwed into the screw hole by the tool. FIG. 6 is an explanatory view when the spiral insert according to the first embodiment of the present invention cuts the tail portion in the reverse direction with a tool. FIG. 7 is an explanatory view of a side cross-sectional structure after the spiral insert according to the first embodiment of the present invention is joined into the base and screwed with a bolt. FIG. 8 is an explanatory view of the installation position of the side notch of the spiral insert according to the second embodiment of the present invention. FIG. 9 is an explanatory view when the spiral insert according to the second embodiment of the present invention cuts the tail. FIG. 10 is an explanatory view of the installation position of the side notch of the spiral insert according to the third embodiment of the present invention. FIG. 11 is an explanatory view of the installation position of the side notch of the spiral insert according to the fourth embodiment of the present invention. FIG. 12 is a cross-sectional side view in which the spiral insert according to the first embodiment of the present invention is coupled into the base. FIG. 13 is an explanatory diagram of a planar structure along the line II-II in FIG. FIG. 14 is an explanatory view when the spiral insert according to the first embodiment of the present invention is taken out of the screw hole by a tool. FIG. 15 is a cross-sectional side view of the helical insert of the present invention formed by a diamond-shaped coil and coupled into a screw hole. FIG. 16 is a bottom view of a conventional spiral insert. FIG. 17 is a bottom view of another conventional helical insert. FIG. 18a is an explanatory view of a three-dimensional structure of a conventional helical insert with a tongue. FIG. 18 b is an explanatory diagram of a three-dimensional structure of another conventional helical insert with a tongue.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an explanatory view of a three-dimensional structure when the bottom of the spiral insert according to the first embodiment of the present invention is directed downward. Referring to FIG. 1, the spiral insert mainly includes a spiral portion 1, a tail portion 2, and a lateral notch 3. The tail portion 2 is connected to one end of the spiral portion 1, and the side notch 3 is provided at a connecting portion between the tail portion 2 and the spiral portion 1.

  FIG. 3 is an explanatory view of a cross-sectional structure of the side surface of the base seat to which the spiral insert according to the first embodiment of the present invention is to be coupled. 1 and 3, the spiral portion 1 is formed in a hollow cylindrical spiral structure, and the spiral portion 1 includes a first end 1a and a second end 1b. The spiral portion 1 can be used to join into the screw hole b of the base B. A female thread is formed in the screw hole b, and the pitch P1 of the thread of the spiral portion 1 is the same as the pitch P2 of the female thread in the screw hole b. When the cross section of the coil is formed in a circular shape, the outer diameter D1 of the spiral portion 1 is greater than or equal to the pitch circle diameter D2 of the female screw in the screw hole b (that is, the average value of the large diameter and the small diameter of the female screw). Formed to be. Among them, preferably, by forming the outer diameter D1 to be larger than the pitch circle diameter D2, the spiral portion 1 is compressed in the radial direction after the spiral portion 1 is coupled into the screw hole b. As a result, an expanding support force in the radial direction is generated with respect to the screw hole b, so that the spiral portion 1 can be tightly coupled into the screw hole b.

  FIG. 2 is an explanatory view of the three-dimensional structure when the bottom of the spiral insert according to the first embodiment of the present invention is directed upward. Referring to FIGS. 1 and 2, the tail portion 2 includes a third end 2 a and a fourth end 2 b, and the third end 2 a of the tail portion 2 is connected to the second end 1 b of the spiral portion 1 and the fourth end of the tail portion 2. The end 2b is located in the hollow part of the spiral portion 1. In this embodiment, the spiral insert is formed by winding a single wire, and the wire includes a head end and a terminal end. The head end of this wire is the first end 1 a of the spiral portion 1, and the end of the wire is the fourth end 2 b of the tail portion 2.

  FIG. 4 is an explanatory diagram of a planar structure along the line II in FIG. 3 and 4, the spiral portion 1 includes a central axis A. The wire forms an inner diameter edge 1c and an outer diameter edge 1d in the spiral portion 1. The connecting surface F1 is located at a connecting portion between the tail portion 2 and the spiral portion 1, and the connecting surface F1 passes through the central axis A of the spiral portion 1 and is orthogonal to the outer diameter edge 1d.

  Referring again to FIGS. 2 and 4, the lateral notch 3 is provided at the connecting portion of the tail portion 2 and the spiral portion 1 and is located inside the bend of the connecting portion. In this embodiment, the side notch 3 includes a first wall 31 and a second wall 32, and the first wall 31 and the second wall 32 include separation ends 31a and 32a and connecting ends 31b and 32b, respectively. . The connecting ends 31 b and 32 b of the first wall 31 and the second wall 32 are connected to each other, and the wire diameter of the wire is formed to be a minimum value at the connecting ends 31 b and 32 b of the first wall 31 and the second wall 32. Thereby, it is formed as a site having a relatively weak structural strength. In addition, the first wall 31 and the second wall 32 are selectively formed to have two inclined surfaces, two concave surfaces, one inclined surface and one concave surface, or other cooperating notch modes. Since it can consist of a structure, it does not specifically limit in this invention.

  Further, the side notch 3 can selectively pass through the connecting surface F <b> 1 from the first wall 31. In this embodiment, the separation end 31a of the first wall 31 is located in the spiral portion 1, and the connecting end 31b and the second wall 32 of the first wall 31 are all located in the tail portion 2, or in other forms The first wall 31 can also be formed so as to pass through the connecting surface F1 from the separation end 31a.

  3 and 4 again, according to the above-described structure, when the spiral insert is screwed into the screw hole b of the base B, the upper portion of the spiral portion 1 is used by using a screwing tool. To the hollow part of the spiral part 1 and the tail part 2 can be clamped.

  FIG. 5 is an explanatory view when the spiral insert according to the first embodiment of the present invention is screwed into the screw hole by the tool. Referring to FIGS. 3 and 5, the bottom of the spiral portion 1 is brought into contact with the opening portion of the screw hole b, and the screwing tool is rotated through the tail portion 2 by rotating the screwing tool. Therefore, the spiral portion 1 can be gradually screwed into the screw hole b. Further, when the screwing tool is turned, the tail part 2 held by the screwing tool is turned toward the second end 1b of the spiral part 1, so that the lateral notch 3 is further compressed (that is, the first notch 1). The wall 31 and the second wall 32 approach each other). Therefore, the tail portion 2 is not separated from the spiral portion 1 in the process of screwing the helical insert into the screw hole b.

  FIG. 6 is an explanatory view when the tail portion is cut by rotating the spiral insert according to the first embodiment of the present invention in the reverse direction with a tool, and FIG. 7 is a diagram showing the basis of the spiral insert according to the first embodiment of the present invention. It is explanatory drawing of the cross-sectional structure of the side surface after it couple | bonds in a seat and is screwed together with the volt | bolt. Referring to FIG. 6, after the spiral portion 1 is completely screwed into the screw hole b and screwed (as shown in FIG. 7), the tail portion sandwiched by the screwing tool is turned by turning the screwing tool in the opposite direction. 2 is moved away from the second end 1b of the spiral portion 1 and the side notch 3 is further expanded (that is, the first wall 31 and the second wall 32 are separated from each other). The tail part 2 and the spiral part 1 are separated by tearing toward the side.

  Among them, since the wire is formed as a portion having relatively weak structural strength at the connection ends 31b and 32b of the first wall 31 and the second wall 32, when the side notch 3 is expanded, the first wall As a result of the stress concentration phenomenon occurring at the connection ends 31b and 32b of the first wall 31 and the second wall 32, it is ensured that a fracture surface is generated from the connection ends 31b and 32b of the first wall 31 and the second wall 32 to the outer edge of the wire. can do.

  Referring to FIG. 7 again, after the spiral portion 1 of the spiral insert is completely screwed into the screw hole b and the tail portion 2 of the spiral insert is removed, the hollow portion of the spiral portion 1 has a tail portion. The obstacle by 2 disappears. Subsequently, the fastened member L is placed on the base B, and the through hole C penetrating the fastened member L is aligned with the screw hole b of the base B, and the bolt S is inserted into the through hole of the fastened member L. After being pierced through C, the external threaded portion T of the bolt S is screwed into the helical portion 1 of the helical insert, and further the pressed member L is pressed by the head H of the bolt S, whereby the fastened member L and the base Seat B can be joined.

  In summary, the main feature of the present invention is that the side notch 3 is installed at the connecting part of the tail part 2 and the spiral part 1, and the side notch 3 is positioned inside the bent part of the connecting part. Thereby, in this invention, not only can the screwing tool holding the tail part 2 couple the spiral part 1 into the relatively small screw hole b, but the spiral part 1 can be connected to the screw hole b. It is possible to ensure that the two are tightly coupled by the supporting force due to the expansion in the radial direction.

  In the present invention, by rotating the screwing tool in the reverse direction, the wire rod can be cut directly from the surface on which the side notch 3 is installed, and further, it is rotated by a large force generated by the stress concentration phenomenon or several times. Since the tail 2 can be easily removed without requiring an impact, and the tail 2 can be directly taken out after cutting, the convenience of use is extremely improved.

  FIG. 8 is an explanatory view of the installation position of the side notch of the spiral insert according to the second embodiment of the present invention. Referring to FIG. 8, the side notch 3 selectively has a separation end 31 a of the first wall 31 spirally when the connection ends 31 b and 32 b of the first wall 31 and the second wall 32 pass through the connection surface F <b> 1. The separation end 32 a of the second wall 32 is located at the tail 2.

  FIG. 9 is an explanatory view when the helical insert according to the second embodiment of the present invention cuts the tail. Based on the above structure, the screw 1 is screwed into the screw hole b, and the screw is turned in the opposite direction. It can contact the inner peripheral wall of the screw hole b at the outer edge portion. That is, by contacting the inner peripheral wall of the screw hole b from the cross-sectional periphery of the first end 1a of the spiral portion 1, it is possible to prevent the spiral portion 1 from sliding due to frictional force. Thus, according to the spiral insert of the present invention, it is possible to more reliably avoid the spiral insert from moving to a deeper portion of the screw hole b in the process of screwing the bolt S into the spiral portion 1 (see FIG. 7).

  FIG. 10 is an explanatory view of the installation position of the side notch of the spiral insert according to the third embodiment of the present invention. Referring to FIG. 10, similarly, the same is achieved by selectively positioning the first wall 31 of the side notch 3 on the connecting surface F1 and the separation end 32a of the second wall 32 on the tail 2. The effect can be achieved.

  FIG. 11 is an explanatory view of the installation position of the side notch of the spiral insert according to the fourth embodiment of the present invention. Referring to FIG. 11, by selectively positioning the second wall 32 of the side cutout 3 on the connecting surface F1 and positioning the separation end 31a of the first wall 31 in the spiral portion 1, the tail portion is similarly obtained. The same effect can be achieved after removing 2.

  FIG. 12 is an explanatory view of a side sectional structure in which a spiral insert according to a first embodiment of the present invention is coupled in a base. With reference to FIGS. 1 and 12, the helical insert is further provided with an engagement recess 4 to further complete the effect of the helical insert of the present invention. The engaging recess 4 is formed so as to be close to the first end 1a of the spiral portion 1 and away from the second end 1b of the spiral portion 1, and the engaging recess 4 is provided at the inner diameter edge 1c of the wire rod. Thus, even after the spiral portion 1 of the spiral insert is screwed into the screw hole b, it can be retracted in the opposite direction (described in more detail later).

  FIG. 13 is an explanatory diagram of a planar structure along the line II-II in FIG. Referring to FIG. 13, the engaging recess 4 includes a hook-shaped peripheral wall 41 and a guiding peripheral wall 42. One end of each of the hook-shaped peripheral wall 41 and the guide peripheral wall 42 is located at the inner diameter edge 1c of the wire, and the hook-shaped peripheral wall 41 extends from the inner diameter edge 1c of the wire toward the outer diameter edge 1d. The other ends of the hook-shaped peripheral wall 41 and the guiding peripheral wall 42 are connected to each other. The reference surface F2 passes through the radial cross section of the wire and one end where the hook-shaped peripheral wall 41 is positioned at the inner diameter edge 1c, and the connecting portion between the hook-shaped peripheral wall 41 and the guide peripheral wall 42 is the reference surface F2 and the head end of the wire ( That is, it is located between the first ends 1a) of the spiral portion 1. In other words, an acute angle is formed between the hook-shaped peripheral wall 41 and the inner diameter end edge 1c of the wire, so that the engaging recess 4 is the first part of the spiral portion 1 at the connecting portion of the hook-shaped peripheral wall 41 and the guide peripheral wall 42. It is formed at a part most adjacent to the end 1a.

  FIG. 14 is an explanatory view when the spiral insert according to the first embodiment of the present invention is taken out of the screw hole by a tool. Referring to FIGS. 12 and 14, based on the above structure, when the spiral portion 1 of the spiral insert is retracted from the screw hole b of the base B, the exit tool is inserted into the hollow portion of the spiral portion 1, Further, by inserting a catching head (not shown) of the exit tool into the engaging recess 4, the catching head can be stably brought into contact with the hook-shaped peripheral wall 41 by the guiding of the guiding peripheral wall 42.

  Thus, when the exit tool is turned, the hooking head of the exit tool applies an inward rotation force to the hook-shaped peripheral wall 41, so that the first end 1 a of the spiral portion 1 is made hollow. By pulling toward the part, the outer diameter edge 1d of the first end 1a of the spiral portion 1 does not contact the inner peripheral wall of the screw hole b, and the first end 1a of the spiral portion 1 and the inner peripheral wall of the screw hole b Since there is no frictional force, the spiral portion 1 can be smoothly interlocked to rotate, and the spiral portion 1 can be withdrawn from the screw hole b of the base B.

  In the spiral insert according to the present invention, when the spiral portion 1 needs to be retracted from the screw hole b by having the hook-shaped peripheral wall 41 formed in an inclined manner in the engagement recess 4, the spiral is inserted. Since the first end 1a of the portion 1 does not come into contact with the inner peripheral wall of the screw hole b, it is not necessary to install a lead angle on the periphery of the cross section of the first end 1a of the spiral portion 1. In other words, when manufacturing the helical insert of the present invention, it is not necessary to form a lead angle with respect to the peripheral edge of the cross section of the first end 1a of the spiral portion 1, and thus the wire portion is directly cut with a cutter and the spiral portion 1 is cut. By forming the first end 1a, the manufacturing process can be simplified and the production efficiency can be increased.

  Referring to FIG. 13 again, when the spiral portion 1 is screwed into the screw hole b, the first end 1a of the spiral portion 1 is aligned with the peripheral edge of the cross section of the first end 1a of the spiral portion 1 of the screw hole b. By making contact with the inner peripheral wall, it is possible to avoid sliding of the spiral portion 1 due to frictional force, which can help to improve the coupling stability between the spiral portion 1 and the screw hole b. . Briefly speaking, when manufacturing the helical insert of the present invention, it is not necessary to install a lead angle at the peripheral edge of the cross section of the first end 1a of the spiral portion 1, and the production efficiency is increased and the helical insert is screwed into the screw hole. It is possible to provide a double effect that the bonding stability after being screwed into b can be enhanced.

  FIG. 15 is a cross-sectional structure explanatory view of a side surface in which a spiral insert according to the present invention is coupled to a screw hole by a coil having a diamond-shaped cross section. Referring to FIG. 15, the outer side of the radial cross section of the wire rod can be aligned with the female screw of the screw hole b, and the inner side of the radial cross section of the wire rod can be aligned with the male screw of the bolt S. Thus, after the spiral portion 1 is screwed into the screw hole b, surface contact is formed with the inner peripheral wall of the screw hole b, and surface contact with the outer screw portion T of the bolt S is further achieved. Since it is formed, the stability of the bond can be increased.

  Further, the outer diameter of the spiral portion 1 can be formed to be larger than or equal to the larger diameter of the female screw of the screw hole b. Among them, it is preferable to be formed so as to be large, so that after the spiral portion 1 is coupled into the screw hole b, the spiral portion 1 is compressed in the radial direction and radially with respect to the screw hole b. Since the supporting force is generated by the expansion of the screw portion 1, the spiral portion 1 can be more tightly coupled in the screw hole b.

  Overall, according to the helical insert of the present invention, the tight connection between the spiral portion and the screw hole can be secured, and the tail portion can be easily removed or taken out after being connected to the screw hole. The effect of enhancing the convenience of use can be achieved.

  According to the helical insert of the present invention, it is possible to retract in the reverse direction after screwing into the screw hole, and it is not necessary to form a lead angle at the cross-sectional peripheral edge of the spiral portion, so that the manufacturing process can be simplified. In addition, the effect of increasing production efficiency can be achieved.

  The present invention may be implemented in other ways without departing from the spirit and essential characteristics thereof. Accordingly, the preferred embodiments described herein are illustrative and not intended to be limiting.

DESCRIPTION OF SYMBOLS 1 Spiral part 1a 1st end 1b 2nd end 1c Inner diameter edge 1d Outer diameter edge 2 Tail part 2a 3rd end 2b 4th end 3 Side notch 31 1st wall 32 2nd wall 4 Engagement recessed part 41 Key-shaped peripheral wall 42 Leading peripheral wall 8 Spiral insert 8 'Spiral insert with tongue 8 "Spiral insert with tongue 81 Spiral insert 82 Tail portion 83 Recess 9 Spiral insert 91 Spiral portion 911 Lead angle 92 Recess 921 Abutting peripheral wall A Central axis B Base Seat b Screw hole C Through hole D1 Outer diameter D2 Pitch circle diameter F1 Connecting surface F2 Reference surface H Head L Fastened member P1 Pitch P2 Pitch S Bolt T External thread N Notch

Claims (9)

  A spiral insert including a spiral portion (1), a tail portion (2) and a lateral notch (3), wherein the spiral portion (1) is formed in a hollow cylindrical spiral structure, and the spiral portion (1) Includes a first end (1a) and a second end (1b), the tail (2) includes a third end (2a) and a fourth end (2b), and a third of the tail (2). The end (2a) is connected to the second end (1b) of the spiral portion (1), and the fourth end (2b) of the tail portion (2) is disposed in the hollow portion of the spiral portion (1), and the side A directional notch (3) is provided at a connecting portion between the tail portion (2) and the spiral portion (1), and the side notch (3) is located inside a bent portion of the connecting portion. Spiral insert.   The helical insert is formed by spirally winding a single wire, and the wire includes a head end and a terminal, and the head end of the wire is the first end (1a) of the spiral portion (1). The end of the wire becomes the fourth end (2b) of the tail (2), the side notch (3) includes the first wall (31) and the second wall (32), and the first The wall (31) and the second wall (32) include a separation end and a connection end, respectively. The connection ends of the first wall (31) and the second wall (32) are connected to each other, and the wire of the wire The spiral insert according to claim 1, wherein the diameter is formed to be a minimum value at a connecting end of the first wall (31) and the second wall (32).   The spiral portion (1) has a central axis (A), and the wire has an inner diameter edge (1c) and an outer diameter edge (1d) formed in the spiral portion (1), and the tail portion (2) The connecting surface (F1) is positioned at the connecting portion of the spiral portion (1), and the connecting surface (F1) passes through the central axis (A) of the spiral portion (1) and the outer diameter edge (1d). The helical insert according to claim 2, characterized in that the first wall (31) of the lateral notch (3) passes through the connecting surface (F1).   The separating end of the first wall (31) passes through the connecting surface (F1), and the connecting end of the first wall (31) and the second wall (32) are all located at the tail (2). The helical insert according to claim 3.   The connection end of the first wall (31) and the second wall (32) passes through the connection surface (F1), and the separation end of the first wall (31) is located in the spiral portion (1), The helical insert according to claim 3, characterized in that the separating end of the second wall (32) is located in the tail (2).   The spiral according to claim 3, characterized in that the first wall (31) is located on the articulating surface (F1) and the separating end of the second wall (32) is located on the tail (2). Insert.   The spiral portion (1) has a central axis (A), and the wire has an inner edge (1c) and an outer diameter edge (1d) formed in the spiral portion (1), and the tail portion (2). The connecting surface (F1) is positioned at the connecting portion of the spiral portion (1), and the connecting surface (F1) passes through the central axis (A) of the spiral portion (1) and the outer diameter edge (1d). ), The second wall (32) of the lateral notch (3) is positioned on the connecting surface (F1), and the separation end of the first wall (31) is positioned on the spiral portion (1). The helical insert according to claim 2, wherein:   An engagement recess (4) is further provided, the engagement recess (4) being close to the first end (1a) of the spiral portion (1) and from the second end (1b) of the spiral portion (1). The helical insert according to claim 3, 4, 5, 6 or 7, wherein the helical recess is formed so as to be far away, and the engaging recess (4) is provided at an inner diameter edge (1c) of the wire.   The engaging recess (4) includes a hook-shaped peripheral wall (41) and a guiding peripheral wall (42), and one end of each of the hook-shaped peripheral wall (41) and the guiding peripheral wall (42) is an inner diameter edge of the wire rod. (1c), the hook-shaped peripheral wall (41) extends from the inner diameter end edge (1c) of the wire toward the outer diameter end edge (1d), and the hook-shaped peripheral wall (41) and the guiding peripheral wall ( The other end of 42) is connected to each other, and the reference plane (F2) passes through one end where the radial cross section of the wire and the hook-shaped peripheral wall (41) are positioned at the inner diameter edge (1c). The spiral insert according to claim 8, wherein a connecting portion of the peripheral wall (41) and the guiding peripheral wall (42) is located between the reference surface (F2) and the head end of the wire rod.

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