TW202012121A - Fastener extractor device - Google Patents

Abstract

A fastener extractor device for removing seized fasteners and aiding in disengaging the extractor device from said seized fastener afterwards. The extractor device includes a shank body, a drive head, a torque-tool body, a tubular sleeve, an external thread, and an internal thread. The torque-tool body includes a plurality of laterally-bracing sidewalls and an at least one engagement feature. The engagement feature is integrated into a specific sidewall to bite into a sized fastener. The drive head is terminally and concentrically connected to the shank body to receive an external torque tool. The torque-tool body is terminally and concentrically connected to the shank body, opposite the drive head. The tubular sleeve is slidably engaged along the shank body through the internal thread and the external thread to physically disengaged the torque-tool body from a seized fastener.

Description

Fastener removal device

The present invention relates to tools of various designs to remove or remove fasteners, such as bolts and nuts. In particular, the present invention relates to a combination of a fastener taking-out device, in which the fastener taking-out device can take out the broken fastener without sliding with the broken fastener.

Hexagon bolts, nuts, screws, and other similar threaded devices are used to securely join multiple workpieces by combining complementary threads, such as male or female threads. The structure of these types of fasteners usually has a cylindrical shaft, an external thread on the surface of the shaft, and a head at one end of the shaft. The external thread is combined with a complementary female thread tapped into the hole or nut to fix the fastener and join the work pieces together. The head of the fastener receives an external torque. The head of the fastener is a means for rotating or driving the fastener into the female thread. The head of the fastener is made into a special shape to allow external tools, such as a wrench, to apply torque to the fastener, allowing the fastener to be bonded to the female thread to some extent. These fasteners are simple, cheap and effective, so they are commonly used in modern industry. One of the most common problems with using these fasteners is that whether they are male or female thread fasteners, these external tools, such as wrenches, will slide on their heads. This problem is often caused by: worn fasteners or tools, corrosion, excessive tightening, or damage to the head of the fastener. There are various conventional methods that can be used to remove fasteners, some of which are more aggressive. Once the head of the fastener is damaged, a more aggressive method must be used to remove the fastener locked by the clip. In this case, digging fasteners with an electric drill is a method that some users often use to remove fasteners. Although this method is indeed effective in some occasions, it has a high risk of damaging the internal thread of the screw hole.

One of the most common problems with using these fasteners is that whether they are male or female thread fasteners, these external tools, such as wrenches, will slide on their heads. This problem is often caused by: worn fasteners or tools, corrosion, excessive tightening, or damage to the head of the fastener. There are various conventional methods that can be used to remove fasteners, some of which are more aggressive. Once the head of the fastener is damaged, a more aggressive method must be used to remove the fastener locked by the clip. In this case, digging fasteners with an electric drill is a method that some users often use to remove fasteners. Although this method is indeed effective in some occasions, it has a high risk of damaging the internal thread of the screw hole.

The present invention provides a fastener take-out device that can surely eliminate the possibility of slippage between the fastener and the take-out device. The present invention uses a series of keyway structures combined together to bite the head of the fastener, and effectively transfers torque between the take-out device and the head of the fastener. The invention also solves the common problems of the traditional bolt removal tool, for example: the problem that the head of the fastener or the fastener itself is attached to the fastener removal tool. Moreover, the present invention allows the user to easily withdraw the residual material or the removed fastener from the removal device.

In one embodiment, the fastener extraction device of the present invention includes: at least one rod body, one drive head, at least one torque tool body, and at least one external thread, wherein the torque tool body further includes: a plurality of side walls, and at least one combination Features; a plurality of side walls are distributed around a rotation axis of the torque tool body; a combination feature is combined with a specific side wall among the plurality of side walls; the driving head is concentrically connected to one end of the rod body; the torque tool body is oriented along the rod body It is distributed in the opposite direction to the drive head, and is concentrically connected to the other end of the rod body; the external thread extends along the rod body between the torsion tool body and the drive head; the external thread is connected to the side of the rod body.

In one embodiment, the fastener extraction device of the present invention further includes: a tubular sleeve, an internal thread, and a nut, wherein the internal thread is within the tubular sleeve; the internal thread extends along the tubular sleeve and cuts into the tubular The inner side of the sleeve; the rod body is located concentrically within the tubular sleeve; the internal thread is mechanically coupled to the external thread; the nut is concentrically connected to one end of the tubular sleeve; the rod body is located within the nut.

In one embodiment, the present invention has a plurality of coupling features; the plurality of coupling features are distributed around the rotation axis of the torsion tool body; each of the plurality of coupling features is combined with a related side wall of the plurality of side walls.

In one embodiment, the invention is designed as a double-ended tool. In this embodiment, at least one rod body further includes: a first rod body and a second rod body; at least one torque tool body further includes: a first torque tool body and a second torque tool body; at least An external thread further includes: a first external thread and a second external thread; the first rod body and the second rod body face each other across the driving head; the first torsion tool body is concentrically connected to one end of the first rod body , And opposite to the driving head through the first rod body; the first external thread extends above the first rod body between the first torsion tool body and the driving head; the first external thread is connected to the side of the first rod body Surface; the second torsion tool body is concentrically connected to one end of the second rod body, and is opposed to the drive head via the second rod body; the second external thread extends from the second rod between the second torsion tool body and the drive head On the body; the second external thread is connected to the side surface of the second rod body.

1‧‧‧rod

10‧‧‧curve area

11‧‧‧ linear area

12‧‧‧rotation axis

13‧‧‧The first base

14‧‧‧Second base

15‧‧‧Male thread

16‧‧‧Tubular sleeve

17‧‧‧ female thread

18‧‧‧Nut

19‧‧‧Overall cross section of the protruding structure

2‧‧‧Drive head

20‧‧‧Specified side wall

21‧‧‧Lateral edge

22‧‧‧The first rod

23‧‧‧The second rod

24‧‧‧The first torque tool body

25‧‧‧The second torque tool body

26‧‧‧First external thread

27‧‧‧Second external thread

3‧‧‧Torque tool body

4‧‧‧Side wall

5‧‧‧First side edge

6‧‧‧Second side edge

7‧‧‧Support surface

8‧‧‧Combined features

9‧‧‧Integral cross section of the combined cavity

FIG. 1 is a perspective view of a fastener extraction device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a fastener extraction device according to an embodiment of the present invention.

3 is a partially enlarged perspective view of a torsion tool body of a fastener take-out device according to an embodiment of the present invention.

4 is a top view of the rod body, drive head, and torque tool body of the fastener take-out device according to an embodiment of the present invention.

5 is a perspective view of a shaft body, a driving head, and a torsion tool body of a fastener extraction device according to another embodiment of the present invention.

6 is a top view of the shaft body, the driving head, and the torsion tool body of the fastener extraction device according to another embodiment of the present invention.

7 is a perspective view of a shaft body, a driving head, and a torque tool body of a fastener take-out device according to yet another embodiment of the present invention.

8 is a perspective view of a fastener take-out device according to a further embodiment of the present invention.

First of all, it should be particularly explained that the illustrations used in this specification are only used to illustrate some embodiments of the present invention, and the scope of the present invention is not limited by these illustrations.

The invention relates to a technology for a fastener take-out tool and a fastener take-out tool accessory. The invention discloses a variety of fasteners for removing screwdriver heads, which include embodiments of male threads and female threads. It is a difficult job to remove the broken fastener from the fastener removal tool. The present invention solves this problem by revealing an ejection sleeve, in which the ejection sleeve withdrawal and ejection device are specially designed to help the user remove any broken fasteners that have been clamped in the fastener extraction tool.

Please refer to Figure 1 and Figure 2. The invention includes: a rod body 1, a driving head 2, a torsion tool body 3, an external thread 15, a tubular sleeve 16, an internal thread 17, and a nut 18. The rod body 1 and the driving head 2 allow the present invention to be attached to an external torque tool, and apply torque through the torque tool body 3 to the fastener with socket to take out the fastener, just like the conventional design. The external torque tools may be, but not limited to, electric drills, torque wrenches, pneumatic drills, socket screwdrivers, and other similar torque tools. The drive head 2 is an element that is combined with an external torque tool. In more detail, the driving head 2 is shaped like a nut, and is concentrically connected to one end of the rod body 1. The shape of the drive head 2 is preferably a hexagon, although other geometric shapes can also be used. In one embodiment of the invention, the shape of the drive head 2 is a square. In another embodiment of the present invention, the bottom end of the driving head 2 is a circular arch, wherein the bottom end of the driving head 2 is the end opposite to the rod body 1 across the driving head 2. This round arch design forms a protruding surface, and the force of impact will be applied to this protruding surface to force the torque tool body 1 into the object to be removed. However, the present invention does not specifically limit the surface of this impact to be a circular arch.

The torsion tool body 3 is a rod-shaped structure that can be combined with a clamped bite, such as a screw with a socket, a screw with a socket, a damaged screw drilled with holes of a specific size, or any A threaded rod-like object in order to apply torque to withdraw the clamped bite. The torsion tool body 3 is distributed along the rod body 1 in a direction opposite to the driving head. Please refer to Figure 3. The torque tool body 3 includes: a plurality of side walls 4, at least one coupling feature 8, a first base 13 and a second base 14. Generally speaking, the torque tool body 3 is a prismatic structure made of high-strength metal, and is concentrically connected to one end of the rod body 1. Each of the plurality of side walls 4 will be integrated within the socket fastener and bite the socket fastener, whereby the torque can be efficiently transmitted from the external torque tool to the socket fastener. A plurality of side walls 4 are distributed around a rotation axis 12 of the torque tool body 3 to form a geometry complementary to the shape of the socket fastener. The plurality of side walls 4 can be varied to match the shape of various socket fasteners. In one embodiment of the present invention, the number of side walls 4 is 6, so that the section of the torque tool body 3 is a hexagon. In another embodiment of the present invention, the number of side walls 4 is 4, so that the cross section of the torque tool body 3 is a square.

The first base 13 and the second base 14 are opposed to each other via the side wall 4, and the rod body 1 is connected to the second base 14 and opposed to the first base 13. Furthermore, the first base 13 and the second base 14 are perpendicular to each of the plurality of side walls 4, thereby forming a prismatic structure of the torsion tool body 3. In a preferred embodiment of the present invention, the first base 13 further includes a first base surface, and the first base surface is perpendicular to each of the plurality of side walls 4. In a preferred embodiment of the present invention, there is a lateral edge 21 between each of the plurality of side walls 4 and the first base 13, and this lateral edge 21 is subjected to a chamfering treatment. Furthermore, the first base 13 may be formed into a tapered shape with a pointed tip, like a punch tool. When the force of the impact is applied to the driving head 2, the coupling feature 8 will bite into the side of the object to be removed. Thereby, the coupling feature 8 will increase the friction between the plurality of side walls 4 and the socket fasteners and the connection between them, so that the relative sliding between them can be prevented. A bonding feature 8 will be bonded to a specific side wall 20 among the plurality of side walls 4, and this specific side wall 20 represents any one of the plurality of side walls 4.

The tubular sleeve 16 is a long tubular structure and its inner diameter matches the outer diameter of the rod body 1. The internal thread 17, the external thread 15, the tubular sleeve 16, and the nut 18 together form an ejection mechanism for removing residual material or socket fasteners from the torque tool body 3. In a preferred embodiment of the present invention, the diameter of the tubular sleeve 16 in the direction of its first end gradually increases along the tubular sleeve 16, where the first end of the tubular sleeve 16 is close to the torque tool body 3. In this way, the contact area of the tubular sleeve 16 and the foreign objects attached to the torque tool body 3 can be increased. The tubular sleeve 16 moves along the rod body 1 and pushes the socket fastener on the torsion tool body 3 until the socket fastener, so-called foreign object, is withdrawn. The external thread 15 extends along the rod body 1 between the torque tool body 3 and the drive head 2. Furthermore, the external thread 15 is connected to the side of the rod body 1. The internal thread 17 is designed to be complementary to the external thread 15, so it can be combined in an interlocking manner. The internal thread 17 extends along the tubular sleeve 16 within the tubular sleeve 16. Furthermore, the internal thread 17 cuts into the inner side of the tubular sleeve 16. For ease of operation, the rod body 1 is located concentrically within the tubular sleeve 16 and the internal thread 17 is mechanically coupled to the external thread 15. As such, when the rod body 1 and the tubular sleeve 16 are combined with each other, the tubular sleeve 16 can slide along the rod body 1. After the user takes out a socket fastener fastened by the clamp with the torque tool body 3, the user may need to remove the socket fastener from the torque tool body 3. In operation, the user rotates the tubular sleeve 16 against the rod body 1 to move the tubular sleeve 16 toward the torque tool body 3 until the tubular sleeve 16 abuts the socket fastener and withdraws the socket fastener from the torque Tool body 3. The user can use his hand to rotate the tubular sleeve 16, but two torque tools, such as a wrench, can also be used to rotate the tubular sleeve 16 by leveraging. One of the wrenches is mechanically coupled to the rod body 1 via the driving head 2, and the other wrench is mechanically coupled to the tubular sleeve 16 via the nut 18. To achieve this, the nut 18 is concentrically connected to one end of the tubular sleeve 16. The rod body 1 is located inside the nut 18. The shape of the nut 18 is preferably hexagonal, although other geometric shapes can be used. The size, length, and material of the tubular sleeve 16 and the nut 18 can be changed to suit the actual needs and user preferences.

Please refer to Figures 3 and 4. In one embodiment of the invention, the bonding feature 8 is a bonding pocket. Each of the plurality of side walls 4 further includes: a first side edge 5, a second side edge 6, and a supporting surface 7. The supporting surface 7 physically abuts a socket fastener, especially the side wall of the head of the socket fastener. The first side edge 5 and the second side edge 6 face each other across the support surface 7. The first side edge 5 and the second side edge 6 of each of the plurality of side walls 4 constitute a corner of the torsion tool body 3 regardless of the angle from the top view or the bottom view. The combined recesses are vertically recessed into the support surface 7 of the specific side wall 20, thereby creating an additional bite point/bite on the support surface 7. This bite point is generated by the combined recess and the support surface 7. In one embodiment of the invention, this coupling pocket extends from the first base 13 to the second base 14 on the torsion tool body 3. In this way, it can be ensured that the additional bite extends along the length of the torque tool body 3 to obtain the maximum bite ability. In one embodiment of the present invention, this bonding cavity gradually becomes smaller from the first base portion 13 to the second base portion 14, as shown in FIG. In order to ensure maximum bite capacity, a whole cross-section 9 of the coupling pocket is parallel to the first base 13 and the second base 14.

Please refer to Figures 3 and 4. In one embodiment of the invention, the overall cross-section 9 of the combined recess is a partial circle. Furthermore, this partial circle is recessed into the torque tool body 3 from the first side edge 5 of a specific side wall 20 to the second side edge 6 of this specific side wall 20. This partial circular shape can ensure that the torque tool body 3 has few or even no high stress points, thus increasing the overall life of the tool. In one embodiment of the invention, the overall cross-section 9 of the combined recess is a triangle. Furthermore, this triangle is recessed into the torque tool body 3 from the first side edge 5 of a specific side wall 20 to the second side edge 6 of this specific side wall 20. The overall cross-section 9 of the combined cavity may also have other shapes, including but not limited to: semi-square, semi-rectangular, and semi-elliptical. In a preferred embodiment of the present invention, the inner corners of triangles, squares, and rectangles have radians to increase the overall strength of the tool.

Please refer to Figure 4. In an embodiment of the present invention, the overall cross-section 9 of the combined cavity further includes: a curved area 10 and a linear area 11. In this way, the formed bite point has a unique shape, which can be used as a sharp bite tooth, which can bite into the corner of the socket fastener, and allow the material inside the socket fastener to enter the coupling cavity, and enter Excellent bite ability of traditional tools. Traditional tools are just designed to push away materials. The excellent biting ability of the present invention is particularly evident for sockets that wear or break fasteners. The curved region 10 is a partially circular curve, which is adjacent to the first side edge 5 of a specific side wall 20. The linear area 11 is adjacent to the curved area 10 and is opposite to the first side edge 5 of the specific side wall 20. The linear region 11 guides a part of the socket member against the formed coupling teeth. The linear area 11 extends from the curved area 10 to the second side edge 6 of this particular side wall 20. In other words, the linear area 11 starts at the curved area 10 and ends at the second side edge 6 of this particular side wall 20. By flipping the positions of the curved area 10 and the straight area 11, this embodiment can be implemented in a clockwise configuration or a counterclockwise configuration.

In one embodiment of the present invention, the combining cavity is located in the center of the supporting surface 7 of a specific side wall 20. Furthermore, the combined acupuncture point is a first length away from the first side edge 5 of the specific side wall 20 and a second length away from the second side edge 6 of the specific side wall 20, where the first length is equal to the second length. In other embodiments of the invention, the first length is not necessarily equal to the second length. Such a position allows the combining cavity to be combined with the inner side of the socket fastener, thereby achieving the maximum torque transfer efficiency and the lowest slip possibility. Moreover, in this embodiment, the socket fastener can be rotated in a clockwise direction or a counterclockwise direction.

Please refer to Figure 5, Figure 6 and Figure 7. In one embodiment of the invention, the bonding feature 8 is a protruding structure for bonding. This coupling protrusion configuration protrudes from a specific side wall 20 of the torque tool body 3 (used to generate additional biting elements). Moreover, this coupling protrusion structure is laterally connected to the support surface 7 of this one specific side wall 20. Furthermore, the coupling protrusion structure extends from the first base portion 13 to the second base portion 14, so that the additional engaging element extends along the length of the torsion tool body 3, so that the present invention can bite into a deeper depth of the socket fastener, and Maximize the torque transmitted to the socket fastener. In a preferred embodiment of the present invention, the combined protrusion structure is located between the first side edge 5 of a specific side wall 20 and the second side edge 6 of this specific side wall 20. This design allows this embodiment to be used as a Tools for clockwise and counterclockwise. In order to ensure consistent biting force along the torsion tool body 3, a whole cross section 19 combined with the protrusion structure is parallel to the first base portion 13 and the second base portion 14.

Please refer to Figure 6. In one embodiment of the invention, the overall cross-section 19 incorporating the protrusion structure is a partial circle. Furthermore, this partial circle protrudes from the first side edge 5 of a specific side wall 20 and the second side edge 6 of this specific side wall 20. Because when worn, the tool receiving hole of the socket fastener will expand. Therefore, the above design is particularly useful for extremely worn socket fasteners. The coupling protrusion structure extends from the supporting surface 7 of the specific side wall 20 and can abut against the worn surface of the socket fastener.

Please refer to Figure 4 and Figure 6. In a preferred embodiment of the present invention, at least one bonding feature 8 includes a plurality of bonding features 8. A plurality of bonding features 8 are distributed around the axis of rotation 12, and each of the plurality of bonding features 8 is combined with an associated side wall 4, as shown in FIG. Such a design produces an additional occlusion feature in each of the plurality of side walls 4. In this way, an effective bite can be ensured between the present invention and a socket fastener.

Please refer to Figure 6. In one embodiment of the present invention, the torque tool body 3 is gradually reduced (converged) from the second base 14 to the first base 13. This design makes the invention applicable to socket fasteners of different sizes. The degree of tapering can vary depending on actual needs and user preferences. In one embodiment of the present invention, the torque tool body 3 can be connected with various auxiliary tools. These auxiliary tools may be, but not limited to, impact tools, hydraulic screws, socket wrenches, and screwdrivers.

Please refer to Figure 8. In one embodiment, the invention is designed as a double-ended tool. In this embodiment, the rod body 1 further includes: a first rod body 22 and a second rod body 23; the torque tool body 3 further includes: a first torque tool body 24 and a second torque tool body 25 The external thread 15 further includes: a first external thread 26, and a second external thread 27. This embodiment provides a double-headed version of the present invention. This double-headed version can provide a variety of uses for the present invention. Furthermore, this embodiment allows clockwise and counterclockwise rotation; the first rod body 22 and the second rod body 23 are opposed to each other via the driving head 2; the first torsion tool body 24 is concentrically connected to the first rod body 22 One end, and opposed to the driving head 2 through the first rod body 22; the first external thread 26 extends above the first rod body 22 between the first torsion tool body 24 and the driving head 2; The thread 26 is connected to the side surface of the first rod body 22; the above depicts a single joint end of the present invention. The second torsion tool body 25 is concentrically connected to one end of the second rod body 23 and is opposed to the drive head 2 via the second rod body 23; the second external thread 27 is in the second The torque tool body 25 and the driving head 2 extend above the second rod body 23; moreover, the second external thread 27 is connected to the side surface of the second rod body 23. In this embodiment, the coupling characteristics of the first torque tool body may be different from the coupling characteristics of the second torque tool body, and form a two-in-one tool.

The invention has been described above with examples. However, it should be understood that, without departing from the spirit or application scope of the present invention, modifications or changes made to these embodiments are still included in the scope of the present invention.

1‧‧‧rod

12‧‧‧rotation axis

13‧‧‧The first base

14‧‧‧Second base

16‧‧‧Tubular sleeve

18‧‧‧Nut

19‧‧‧Overall cross section of the protruding structure

2‧‧‧Drive head

20‧‧‧Specified side wall

21‧‧‧Lateral edge

3‧‧‧Torque tool body

4‧‧‧Side wall

7‧‧‧Support surface

8‧‧‧Combined features

9‧‧‧Integral cross section of the combined cavity

Claims (13)

A fastener extraction device, comprising: at least one rod body; one drive head; at least one torsion tool body; at least one external thread, wherein: the torsion tool body includes: a plurality of side walls, and at least one coupling feature; the plurality of The side wall is distributed around a rotation axis of the torsion tool body; one of the coupling features is combined with a specific side wall of the plurality of side walls; the drive head is concentrically connected to one end of the rod body; the torsion tool body is along the The rod body is distributed in the opposite direction to the drive head; the torsion tool body is concentrically connected to the other end of the rod body; the external thread extends along the rod body between the torsion tool body and the drive head; the outer The thread is connected to the side of the rod body. The fastener extraction device as described in item 1 of the application scope, further comprising: a tubular sleeve; and an internal thread, wherein the internal thread is within the tubular sleeve; the internal thread extends along the tubular sleeve The internal thread cuts into the inner side of the tubular sleeve; the rod body is concentrically located within the tubular sleeve; the internal thread is mechanically coupled to the external thread. The fastener extracting device as described in item 2 of the application scope further includes: a nut, wherein the nut is concentrically connected to one end of the tubular sleeve; the rod body is located inside the nut. The fastener extraction device according to item 1 of the application scope, wherein the at least one coupling feature includes a plurality of coupling features; the plurality of coupling features are distributed around the rotation axis of the torsion tool body; among the plurality of coupling features Each of them is combined with a related side wall of the plurality of side walls. The fastener extracting device as described in item 1 of the application scope, wherein the coupling feature is a coupling recess; the torsion tool body further includes: a first base and a second base; each of the plurality of side walls It further includes: a first side edge, a second side edge and a supporting surface; the first side edge and the second side edge are opposed to each other across the supporting surface; the rod body is connected to the second base and is in contact with the The first base is opposed; the combining cavity is vertically recessed into the supporting surface of a specific side wall. The fastener extracting device as described in item 5 of the application scope, wherein an overall cross-section of the combining pocket is parallel to the first base and the second base. The fastener extracting device as described in item 5 of the application scope, wherein a whole cross section of the combining cavity further comprises: a curved area and a linear area; the curved area is adjacent to the first side wall of the specific side wall Side edge; the linear area is adjacent to the curved area and is relative to the first side edge of the specific side wall; the linear area extends from the curved area to the second side edge of the specific side wall. The fastener extracting device as described in item 1 of the application scope, wherein the coupling feature is a coupling protrusion structure; the torsion tool body further includes: a first base and a second base; each of the plurality of side walls It further includes: a first side edge, a second side edge and a supporting surface; the first side edge of a specific side wall and the second side edge of the specific side wall are opposed to each other across the supporting surface; the rod body is connected On the second base and opposite to the first base; the coupling protrusion structure is laterally connected to the supporting surface of the specific side wall; the coupling protrusion structure extends from the first base to the second base; the coupling protrusion structure Located between the first side edge of the specific side wall and the second side edge of the specific side wall. The fastener extracting device as described in item 8 of the application scope, wherein an overall cross section of the coupling protrusion structure is parallel to the first base and the second base. The fastener taking-out device as described in item 8 of the application scope, wherein the whole cross-section of the combined protrusion structure is a partial circle; the partial circle is from the first side edge of a specific side wall and the specific side wall It protrudes between the second side edges. The fastener extracting device according to item 1 of the application scope, wherein the torsion tool body further includes: a first base and a second base; the rod body is connected to the second base and opposite to the first base; the The torsion tool body gradually shrinks from the second base to the first base. The fastener extracting device according to item 5 of the application scope, wherein each of the plurality of side walls and the first base has a lateral edge, and the lateral edge is subjected to a chamfering treatment. The fastener extracting device according to item 1 of the application scope, wherein the at least one rod body further includes: a first rod body and a second rod body; the at least one torque tool body further includes: a first torque tool body And a second torsion tool body; the at least one external thread further includes: a first external thread and a second external thread; the first rod body and the second rod body are opposed to each other across the drive head; The first torsion tool body is concentrically connected to one end of the first rod body, and is opposed to the driving head via the first rod body; the first external thread extends between the first torsion tool body and the driving head On the first rod body; the first external thread is connected to the side surface of the first rod body; the second torsion tool body is concentrically connected to one end of the second rod body, and is separated by the second The rod body is opposite to the driving head; the second external thread extends above the second rod body between the second torsion tool body and the driving head; the second external thread is connected to the second rod body Side surface.

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