TW202417191A - 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 various tools designed to extract or remove fasteners, such as bolts and nuts. In particular, the present invention relates to a combination of a fastener extraction device, wherein the fastener extraction device can extract a broken fastener without sliding between the broken fastener and the broken fastener.

Hexagonal bolts, nuts, screws, and other similar threaded devices are used to secure multiple workpieces together by engaging complementary threads, such as male or female threads. The construction of these types of fasteners generally 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 in a hole or nut to secure the fastener and join the workpieces 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 an external tool, such as a wrench, to apply torque to the fastener so that the fastener engages the female thread to a certain extent. These fasteners are simple, cheap, and effective, so they are commonly used in modern industry. One of the most common problems with these fasteners is that the external tool, such as a wrench, can slip on the head of either male or female threaded fasteners. This problem is often caused by: worn fasteners or tools, rust, over-tightening, or damage to the fastener head. There are various known methods for removing fasteners, some of which are more invasive than others. Once the fastener head is damaged, more invasive methods must be used to remove the clamped fastener. In this case, using an electric drill to dig out the fastener is a common method used by some users to remove the fastener. Although this method does work in some cases, it carries a high risk of damaging the internal threads of the screw hole.

One of the most common problems with these fasteners is that these external tools, such as wrenches, can slip on the head of either male or female threaded fasteners. This problem often occurs due to: worn fasteners or tools, rust, over-tightening, or damage to the fastener head. There are various known methods for removing fasteners, some of which are more invasive than others. Once the fastener head is damaged, more invasive methods must be used to remove the clamped fastener. In this case, using an electric drill to dig out the fastener is a common method used by some users to remove the fastener. Although this method does work in some cases, it carries a high risk of damaging the internal threads of the screw hole.

The present invention provides a fastener extraction device that can effectively eliminate the possibility of slippage between the fastener and the extraction device. The present invention uses a series of keyway structures combined together to bite the head of the fastener and effectively transmit torque between the extraction device and the head of the fastener. The present invention also solves common problems of traditional bolt extraction tools, such as the problem of the fastener head or the fastener itself being attached to the fastener extraction tool. Furthermore, the present invention allows the user to easily withdraw the remaining material or the removed fastener from the extraction device.

In one embodiment, the fastener removal device of the present invention comprises: at least one rod, a drive head, at least one torque tool body, and at least one external thread, wherein the torque tool body further comprises: a plurality of side walls, and at least one coupling feature; the plurality of side walls are distributed around a rotation axis of the torque tool body; a coupling feature is coupled to a specific side wall among the plurality of side walls; the drive head is concentrically connected to one end of the rod; the torque tool body is distributed along the rod in a direction opposite to the drive head, and is concentrically connected to the other end of the rod; the external thread extends along the rod between the torque tool body and the drive head; the external thread is connected to the side of the rod.

In one embodiment, the fastener removal device of the present invention further comprises: a tubular sleeve, an internal thread, and a nut, wherein the internal thread is inside the tubular sleeve; the internal thread extends along the tubular sleeve and cuts into the inner side surface of the tubular sleeve; the rod is concentrically located inside 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; and the rod is located inside 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 torque tool body; each of the plurality of coupling features is coupled to an associated side wall of the plurality of side walls.

In one embodiment, the present invention is designed as a double-headed tool. In this embodiment, at least one rod further includes: a first rod and a second rod; at least one torque tool body further includes: a first torque tool body and a second torque tool body; at least one external thread further includes: a first external thread and a second external thread; the first rod and the second rod are opposite to each other across the drive head; the first torque tool body is concentrically connected to one end of the first rod and is separated from the second rod by the drive head. A rod is opposite to the drive head; a first external thread extends on the first rod between the first torque tool body and the drive head; the first external thread is connected to the side surface of the first rod; the second torque tool body is concentrically connected to one end of the second rod and is opposite to the drive head across the second rod; the second external thread extends on the second rod between the second torque tool body and the drive head; the second external thread is connected to the side surface of the second rod.

1: Rod body

10: Curve area

11: Straight line area

12: Rotation axis

13: First base

14: Second base

15: External thread

16: Tubular sleeve

17: Internal thread

18: Nut

19: Overall cross section of the junctional protrusion structure

2: Drive head

20: Specific sidewalls

21: Lateral edge

22: First rod

23: Second rod

24: First torque tool body

25: 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: Combination characteristics

9: Overall cross section of the combined cavity

Figure 1 is a three-dimensional diagram of a fastener removal device according to an embodiment of the present invention.

Figure 2 is a three-dimensional exploded view of a fastener removal device according to an embodiment of the present invention.

Figure 3 is a three-dimensional partial enlarged view of the torque tool body of a fastener removal device according to an embodiment of the present invention.

FIG4 is a top view of the rod, driving head, and torque tool body of a fastener removal device according to an embodiment of the present invention.

Figure 5 is a three-dimensional diagram of the rod, driving head, and torque tool body of a fastener removal device according to another embodiment of the present invention.

FIG6 is a top view of the rod, driving head, and torque tool body of a fastener removal device according to another embodiment of the present invention.

FIG. 7 is a three-dimensional diagram of a rod, a driving head, and a torque tool body of a fastener removal device according to another embodiment of the present invention.

Figure 8 is a three-dimensional diagram of a fastener removal device according to another embodiment of the present invention.

First of all, it should be specially pointed out that the illustrations used in this manual are only used to illustrate certain embodiments of the present invention, and the scope of the present invention is not limited by these illustrations.

The present invention relates to a fastener extraction tool and fastener extraction tool accessories. The present invention discloses a variety of fastener extraction screwdriver bits, including male and female threaded embodiments. Removing damaged fasteners from a fastener extraction tool is a difficult task. The present invention solves this problem by disclosing an extraction sleeve, wherein the extraction sleeve is combined with an extraction device, which is specially designed to help the user remove any damaged fastener that has been clamped on the fastener extraction tool.

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

The torque tool body 3 is a rod-shaped structure that can be combined with a clamped fastener, such as a screw with a socket, a screw with a socket, a broken screw with a hole of a specific size drilled out, or any rod-shaped object with threads, so as to apply torque to withdraw the clamped fastener. The torque tool body 3 is distributed along the rod 1 in the opposite direction of the drive head. Please refer to Figure 3. The torque tool body 3 includes: a plurality of side walls 4, at least one combining 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 1. Each of the plurality of side walls 4 is coupled to the socket fastener and bites the socket fastener, thereby efficiently transmitting torque from the external torque tool to the socket fastener. The plurality of side walls 4 are distributed around a rotation axis 12 of the torque tool body 3 to form a geometric shape that complements the shape of the socket fastener. The plurality of side walls 4 can be varied to match the shapes of various socket fasteners. In one embodiment of the present invention, the number of side walls 4 is 6, so that the cross-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 opposite to each other across the side wall 4, and the rod 1 is connected to the second base 14 and is opposite 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 torque 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 the lateral edge 21 is chamfered. Furthermore, the first base 13 can be made into a cone with a pointed tip, like a punch tool. When the impact force is applied to the drive head 2, the coupling feature 8 bites into the side of the object to be removed. Thereby, the coupling feature 8 increases the friction between the plurality of side walls 4 and the socket fastener and the connection between them, thereby preventing relative sliding between them. A coupling feature 8 is coupled 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 1. The inner thread 17, the outer thread 15, the tubular sleeve 16, and the nut 18 together form an ejection mechanism for removing the remaining material or the socket fastener 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, wherein the first end of the tubular sleeve 16 is close to the torque tool body 3. In this way, the contact area between the tubular sleeve 16 and the foreign object attached to the torque tool body 3 can be increased. The tubular sleeve 16 moves along the rod 1 and pushes the socket fastener on the torque tool body 3 until the socket fastener, that is, the so-called foreign object, is ejected. The outer thread 15 extends along the rod 1 between the torque tool body 3 and the drive head 2. Alternatively, the outer thread 15 is connected to the side of the rod 1. The inner thread 17 is designed to complement the outer thread 15 so that they can be engaged in an interlocking manner. The inner thread 17 extends along the tubular sleeve 16 inside the tubular sleeve 16. Alternatively, the inner thread 17 cuts into the inner side surface of the tubular sleeve 16. For ease of operation, the rod 1 is concentrically located inside the tubular sleeve 16, and the inner thread 17 is mechanically engaged with the outer thread 15. In this way, when the rod 1 and the tubular sleeve 16 are engaged with each other, the tubular sleeve 16 can slide along the rod 1. After the user uses the torque tool body 3 to remove a stuck socket fastener, the user may need to remove the socket fastener from the torque tool body 3. During operation, the user rotates the tubular sleeve 16 against the rod 1 to move the tubular sleeve 16 toward the torque tool body 3 until the tubular sleeve 16 abuts against the socket fastener and withdraws the socket fastener from the torque tool body 3. The user can use his hands to rotate the tubular sleeve 16, but two torque tools, such as wrenches, can also be used to rotate the tubular sleeve 16 by lever action. One of the wrenches is mechanically coupled to the rod 1 via the drive 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 1 is located inside the nut 18. The shape of the nut 18 is preferably hexagonal, although other geometric shapes can also be used. The size, length, and material of the tubular sleeve 16 and the nut 18 can be changed to suit actual needs and user preferences.

Please refer to Figures 3 and 4. In one embodiment of the present invention, the coupling feature 8 is a coupling recess. Each of the plurality of side walls 4 further includes: a first side edge 5, a second side edge 6, and a support surface 7. The support surface 7 physically abuts against a socket fastener, especially the side wall of the socket fastener head. The first side edge 5 and the second side edge 6 are opposite to each other across the support surface 7. Regardless of whether viewed from the top or the bottom, the first side edge 5 and the second side edge 6 of each of the plurality of side walls 4 constitute the corners of the torque tool body 3. The coupling recess is vertically recessed into the support surface 7 of a specific side wall 20, thereby generating an additional bite point/bite tooth on the support surface 7. This bite point is jointly generated by the coupling recess and the support surface 7. In one embodiment of the present invention, the coupling recess extends from the first base 13 to the second base 14 on the torque 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 capacity. In one embodiment of the present invention, the coupling recess gradually decreases from the first base 13 to the second base 14, as shown in Figure 3. In order to ensure the maximum bite capacity, the overall cross-sectional surface 9 of the coupling recess is parallel to the first base 13 and the second base 14.

Please refer to Figures 3 and 4. In one embodiment of the present invention, the overall cross-section 9 of the combined recess is a partial circle. More specifically, the 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 the specific side wall 20. This partial circle ensures that there are few or even no high stress points in the torque tool body 3, thereby increasing the overall life of the tool. In one embodiment of the present invention, the overall cross-section 9 of the combined recess is a triangle. More specifically, the 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 the specific side wall 20. The overall cross-section 9 of the combined recess can also be other shapes, including but not limited to: semi-square, semi-rectangular, and semi-elliptical. In a preferred embodiment of the present invention, the inner angles of the triangle, square, and rectangle have a radius to increase the overall strength of the tool.

Please refer to Figure 4. In one embodiment of the present invention, the overall cross-section 9 of the coupling recess further includes: a curved area 10, and a straight area 11. Thereby, the bite point formed has a unique shape, which can be used as a sharp bite tooth, which can bite into the corner of the socket fastener, allowing the material on the inner side of the socket fastener to enter the coupling recess, thereby generating a better bite ability than traditional tools. Traditional tools are only designed to push away materials. The excellent bite ability of the present invention is particularly evident for the socket of the worn or damaged fastener. The curved area 10 is a partially circular curve, which is adjacent to the first side edge 5 of a specific side wall 20. The straight 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 straight area 11 guides a portion of the socket member to form a coupling tooth. The straight area 11 extends from the curved area 10 to the second side edge 6 of the specific side wall 20. In other words, the straight area 11 starts at the curved area 10 and ends at the second side edge 6 of the specific side wall 20. By reversing 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 coupling recess is located at the center of the supporting surface 7 of a specific side wall 20. Furthermore, the coupling recess 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, wherein the first length is equal to the second length. In other embodiments of the present invention, the first length is not necessarily equal to the second length. Such a position allows the coupling recess to couple with the inner side edge of the socket fastener to achieve maximum torque transfer efficiency and minimum slippage possibility. Furthermore, this embodiment can rotate the socket fastener in a clockwise direction or a counterclockwise direction.

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

Please refer to Figure 6. In one embodiment of the present invention, the overall cross-section 19 of the coupling protrusion structure is a partial circle. Moreover, the partial circle protrudes from between the first side edge 5 of a specific side wall 20 and the second side edge 6 of the specific side wall 20. Since the tool receiving hole of the socket fastener will expand during wear, 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 and bite into the worn surface of the socket fastener.

Please refer to Figures 4 and 6. In a preferred embodiment of the present invention, at least one coupling feature 8 includes a plurality of coupling features 8. The plurality of coupling features 8 are distributed around the rotation axis 12, and each of the plurality of coupling features 8 is coupled to a corresponding side wall 4, as shown in Figure 3. Such a design produces an additional bite 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 gradually shrinks (taperes) from the second base 14 to the first base 13. This design allows the present invention to be applied to socket fasteners of different sizes. The degree of taper can be changed depending on actual needs and user preferences. In one embodiment of the present invention, the torque tool body 3 can be connected to a variety of auxiliary tools. These auxiliary tools can be but are not limited to: impact tools, hydraulic screws, socket wrenches, and screwdrivers.

Please refer to FIG8. In one embodiment, the present invention is designed as a double-ended tool. In this embodiment, the rod 1 further includes: a first rod 22 and a second rod 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-ended version of the present invention. This double-ended version can provide the present invention with a variety of uses. Furthermore, this embodiment allows clockwise and counterclockwise rotation; the first rod 22 and the second rod 23 are opposite to each other across the drive head 2; the first torque tool body 24 is concentrically connected to one end of the first rod 22 and is opposite to the drive head 2 across the first rod 22; the first external thread 26 extends on the first rod 22 between the first torque tool body 24 and the drive head 2; further, the first external thread 26 is connected to the side surface of the first rod 22; the above describes a single coupling end of the present invention. Symmetrical to the above-mentioned coupling end, the second torque tool body 25 is concentrically connected to one end of the second rod 23 and is opposite to the drive head 2 across the second rod 23; the second external thread 27 extends on the second rod 23 between the second torque tool body 25 and the drive head 2; moreover, the second external thread 27 is connected to the side surface of the second rod 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 a two-in-one tool is formed.

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

1: Rod body

12: Rotation axis

13: First base

14: Second base

16: Tubular sleeve

18: Nut

19: Overall cross section of the junctional protrusion structure

2: Drive head

20: Specific sidewalls

21: Lateral edge

3: Torque tool body

4: Side wall

7: Support surface

8: Combination characteristics

Claims (11)

A fastener removal device, comprising: At least one rod; a drive head; At least one torque tool body; The drive head is concentrically connected to one end of the rod; The torque tool body is distributed along the rod in the opposite direction to the driving head; The torque tool body is concentrically connected to the other end of the rod; The torque tool body further includes: a first base and a second base; Each of the plurality of side walls further comprises: a first side edge, a second side edge, and a supporting surface; The first side edge and the second side edge are opposite to each other across the supporting surface; The rod is connected to the second base and is opposite to the first base; Its main features are: The torque tool body includes: a plurality of side walls, and at least one coupling feature; wherein the binding feature is a binding cavity; The coupling cavity is vertically recessed into the supporting surface of the specific side wall; The plurality of side walls are distributed around a rotation axis of the torque tool body; One of the bonding features is bonded to a specific side wall among the plurality of side walls. The fastener removal device as described in Item 1 of the application scope further includes: A nut; At least one external thread; The external thread extends along the rod between the torque tool body and the drive head; The external thread is connected to the side of the rod; The rod is located within the nut; The nut is mechanically coupled to the outer thread of the rod; The fastener removal device as described in Item 2 of the application scope further includes: a tubular sleeve; One internal thread; The internal thread is inside the tubular sleeve; The internal thread extends along the tubular sleeve; The internal thread cuts into the inner side surface of the tubular sleeve; The rod is concentrically located 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. A fastener removal device as described in Item 1 of the application scope, wherein: The at least one binding feature comprises a plurality of binding features; The plurality of coupling features are distributed around the rotation axis of the torque tool body; Each of the plurality of bonding features is bonded to an associated one of the plurality of sidewalls. The fastener removal device as described in Item 1 of the application scope, wherein the overall cross-section of the combined recess is parallel to the first base and the second base. A fastener removal device as described in Item 5 of the application scope, wherein: The overall cross-section of the combined cavity further includes: a curved area and a straight area; The curved region is adjacent to the first side edge of a specific side wall; The straight area is adjacent to the curved area and is opposite to the first side edge of the specific side wall; The straight line region extends from the curved region to the second side edge of the specific side wall. A fastener removal device as described in Item 1 of the application scope, wherein: The binding feature is a binding protrusion structure; The torque tool body further includes: a first base and a second base; Each of the plurality of side walls further comprises: 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 opposite to each other across the supporting surface; The rod is connected to the second base and is 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 is located between the first side edge of the specific side wall and the second side edge of the specific side wall. As described in item 7 of the application scope, the overall cross-section of the combined protrusion structure is parallel to the first base and the second base. A fastener removal device as described in Item 7 of the application scope, wherein: The overall cross-section of the junction protrusion structure is a partial circle; The partial circle protrudes from between the first side edge of a specific side wall and the second side edge of the specific side wall. A fastener removal device as described in Item 1 of the application scope, wherein: The torque tool body further includes: a first base and a second base; The rod is connected to the second base and is opposite to the first base; The torque tool body gradually tapers from the second base to the first base. The fastener removal device as described in Item 1 of the application scope further includes: At least one external thread; a tubular sleeve; One internal thread; The internal thread is inside the tubular sleeve; The at least one rod further comprises: a first rod and a second rod; The at least one torque tool body further comprises: a first torque tool body, and a second torque tool body; The at least one external thread further includes: a first external thread and a second external thread; The first rod and the second rod are opposite to each other via the driving head; The first torque tool body is concentrically connected to one end of the first rod and is opposite to the driving head across the first rod; The first external thread extends on the first rod between the first torque tool body and the drive head; The first external thread is connected to the side surface of the first rod; The second torque tool body is concentrically connected to one end of the second rod and is opposite to the driving head across the second rod; The second external thread extends on the second rod between the second torque tool body and the drive head; The second external thread is connected to the side surface of the second rod.

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