TWI750829B - Screw remover - Google Patents

Abstract

A screw remover of the present invention includes a head portion and a tail portion. The head portion is adapted for connecting to a driving tool. The tail portion is coaxial to the head portion and is a frustum. The tail portion has a terminal face at an end thereof remote from the head portion. The tail portion is tapered from an end thereof closer to the head portion toward the terminal face. At least one thread is formed on the peripheral face of the tail portion and spirally extends around an axis of the tail portion. At least one groove crossing the at least one thread is formed on the peripheral face of the tail portion. An end of the at least one groove extends to the terminal face. Thereby, the tail portion is adapted for inserting into the driving hole of the screw, and the head portion is adapted for connecting to other driving tools so that the screw can be rotated to remove via the screw remover.

Description

Screw removal tool

The present invention relates to a screw removal tool, in particular, to a screw removal tool for removing screws with worn screw holes.

Press, screws are quite common parts in various items or machines. However, under the influence of rust or dust accumulation over time, or due to the deformation of screws and screw holes, screws may be too tightly combined with screw holes. It is not easy to be removed by screwing. At this time, if you try to remove the screw several times and forcefully, it may cause the hexagon socket hole in the screw to be worn and rounded. snap so that the screws cannot be removed.

In order to remove this type of screw, new screw holes are usually drilled on the screw, or a screw thread is formed in the original hexagonal hole, and then a tool is used to screw it to remove the screw. However, this method is not only a procedure It is cumbersome, time-consuming and labor-intensive, and it also produces metal debris. In addition, the screw will suffer irreversible damage, and not every screw has enough volume to drill a new screw hole or form a screw thread.

One of the objectives of the present invention is to provide a screw removal tool, which can remove worn and difficult-to-remove screws in a relatively simple manner, avoiding the complicated procedures and destructive means of the prior art.

Based on the above purpose, the present invention provides a screw removal tool, which includes a head and a tail, the head is for socketing a hand tool, the tail is coaxial with the head, the tail is a frustum, and the tail is farther away from the One end of the head has an end face, the tail is tapered from the end closer to the head toward the end face, and at least one thread protrudes from the peripheral surface of the tail and surrounds an axis of the tail along the peripheral surface of the tail The core extends spirally, at least one groove is formed on the peripheral surface of the tail portion and intersects with the at least one thread, and one end of the at least one groove extends to the end surface.

In some cases, the screw removal tool of the present invention further comprises a step portion, the step portion is a cylinder and is coaxial with the socket hole, the step portion is connected between the head portion and the tail portion, the step portion is The outer diameter is smaller than the outer diameter of the head.

In some cases, the end surface of the tail portion defines a circular outer edge contour, the at least one groove forms an opening on the end surface of the tail portion, and opposite ends of the contour of the opening are respectively defined as a first end and a The second end, the outer edge contour of the end face of the tail passes through the opening and the part between the first end and the second end is defined as an imaginary contour, and the distance from the contour of the opening to the imaginary contour is defined at the maximum value It is a bottom, and the linear distance from the bottom to the first end is not equal to the linear distance from the bottom to the second end; preferably, the outline of the opening of the at least one groove is between the first end and the bottom The contour of the opening of the at least one groove is also a straight line between the second end and the bottom, so that the at least one groove is surrounded by two side walls; in another embodiment, the at least one groove is formed by two side walls. The outline of the opening of a groove is a concave arc shape, so that the at least one groove is surrounded by a concave arc surface.

In some cases, the head has a socket hole, the socket hole is a non-circular hole, and the tail is coaxial with the socket hole.

In some cases, the head is a polygonal cylinder.

In some cases, the depth of the at least one groove increases from an end proximate the head toward an end proximate the end face of the tail.

In some cases, the longitudinal extension direction of the at least one groove is not parallel to the generatrix of the tail.

In some cases, the tail is a truncated cone and its taper is not less than 0.175 and not more than 0.28; preferably, the longitudinal length of the at least one groove is greater than half of the length of the generatrix of the tail.

In some cases, the end surface of the tail portion is a concave arc surface whose center is more concave than the periphery.

In some cases, the number of the at least one thread is an integer multiple of six.

Therefore, the screw removal tool provided by the present invention can be firmly inserted into the hexagonal inner hole of the screw, and by connecting the other end with a tool such as an air wrench, the air wrench can be used to drive the screw to rotate together with the screw removal tool, and then the screw can be removed. It is very convenient to remove the screws without destroying the screws, and it is suitable for screws of different sizes or different degrees of wear.

X: axis

10,10a: Head

11: Socket hole

20,20a: tail

21: End face

22: Thread

23: Groove

231, 231a: Openings

232, 232a: first end

233, 233a: Second end

234, 234a: Bottom

30: Class Ministry

40: Air wrench

50: Screw

51: Hexagon hole

FIG. 1 is a perspective view of the present invention.

Figure 2 is a front view of the present invention.

3 is a cross-sectional view of the present invention.

FIG. 4 is a top view of the present invention.

FIG. 5 is a top view of the second embodiment of the present invention.

FIG. 6 is a schematic diagram of the use of the present invention.

FIG. 7 is a perspective view of a third embodiment of the present invention.

FIG. 8 is a top view of a third embodiment of the present invention.

FIG. 9 is a perspective view of a fourth embodiment of the present invention.

Please refer to FIGS. 1 to 3 , the present invention provides a screw removal tool, which includes a head 10 and a tail 20 . In this embodiment, the head 10 has a socket hole 11 , and the socket hole 11 is a socket A non-circular hole, such as a quadrangular column hole, and the socket hole 11 can have rounded corners that expand outwards to facilitate the insertion of other tools. In other possible embodiments, the head 10a can be a polygonal column. The tail 20 is coaxial with the socket hole 11, and the tail 20 is a frustum (preferably a truncated cone, with a taper not less than 0.175 and not higher than 0.28, that is to say, the angle between the bus bar of the tail 20 and the axis is about 5 to 8 degrees), the end of the tail 20 farther from the head 10 has an end face 21, the end face 21 is preferably The ground is a concave arc surface whose center is more concave than the periphery. The tail portion 20 tapers from the end closer to the head portion 10 toward the end face 21. At least one screw thread 22 is formed protruding from the peripheral surface of the tail portion 20 and along the end surface 21. The peripheral surface of the tail portion 20 spirally extends around an axis X of the tail portion 20 , at least one groove 23 is formed on the peripheral surface of the tail portion 20 and staggered with the at least one screw thread 22 , and one end of the at least one groove 23 extends to the end face 21; preferably, the screw removal tool is integrally formed with steel or other metals, and can also be made of plastic or other composite materials. In addition, in this embodiment, the at least one screw thread 22 includes a plurality of screws. The number of teeth 22 is an integer multiple of six, the at least one groove 23 also includes a plurality of grooves 23, and the number is also preferably an integer multiple of six, and the grooves 23 are arranged around the axis X of the tail portion 20. Equiangular distribution, each of the grooves 23 and a plurality of the screw teeth 22 are staggered; however, in other possible embodiments, the number of grooves in the tail portion 20a can also be less than six, for example, as shown in FIG. 7 and FIG. Two of the grooves 23 are included.

Specifically, in this embodiment, the screw removal tool further includes a step portion 30, the step portion 30 is a cylinder and is coaxial with the socket hole 11, the step portion 30 is connected to the head 10 and the Between the tail portions 20, the outer diameter of the stepped portion 30 is smaller than the outer diameter of the head portion 10; preferably, the head portion 10 and the stepped portion 30 are respectively cylindrical.

Please refer to FIGS. 4 and 5 , the end surface 21 of the tail portion 20 defines a circular outer edge profile, each of the grooves 23 , 23 a forms an opening 231 , 231 a on the end surface 21 of the tail portion 20 . The portion of the outer edge profile passing through the openings 231, 231a and inside the openings 231, 231a is defined as an imaginary profile (ie The imaginary arc contour on the outer side of the opening), the opposite ends of the imaginary contour are respectively defined as a first end 232, 232a and a second end 233, 233a, the shortest distance from each point of the actual contour of the opening 231, 231a to the imaginary contour Defined as a first length, the actual contour of the openings 231, 231a has the largest position of the first length is defined as a bottom 234, 234a, the linear distance from the bottom 234, 234a to the first end 232, 232a and the bottom 234, 234a The straight-line distances to the second ends 233, 233a are not equal, so that the openings 231, 231a are left-right asymmetrical, and preferably, the openings of the grooves 23, 23a have the same inclination direction, which is the same as when the screws are removed. corresponding to the direction of rotation.

In this embodiment, the contour of the opening 231 of each groove 23 is a straight line between the first end 232 and the bottom 234 , and the contour of the opening 231 of each groove 23 is between the second end 233 and the bottom 234 . There is also a straight line between the bottoms 234, so that each of the grooves 23 is surrounded by two side walls, as shown in FIG. 4; however, in other embodiments, the contour of the opening 231a of each of the grooves 23a can also be Concave arc shape, so that each of the grooves 23a is surrounded by a concave arc surface.

In more detail, in order to make the tail portion 20 easy to rotate and insert into the hexagonal hole 51 of the screw 50, the longitudinal extension direction of each of the grooves 23, 23a is not parallel to the busbar direction of the tail portion 20, so that the The grooves 23, 23a are all inclined in the same direction to the bus bar of the tail portion 20, and the direction of the inclination corresponds to the direction of the screw (preferably, it is opposite to the screw direction of the screw teeth 22), wherein the bus bar refers to the axis around the axis A circle is formed to form the hypotenuse of a right-angled triangle of a cone; in addition, in order to facilitate the stable insertion of the tail 20 into the hexagonal hole 51 of the screw 50, the depth of each of the grooves 23, 23a starts from one end of the groove 23, 23a close to the end of the head 10 It is gradually increased toward one end of the end surface 21 of the tail portion 20, that is, each of the grooves 23, 23a has a maximum depth at the opening 231, 231a; on the other hand, considering that the tail portion 20 is actually inserted into the screw 50 For the insertion depth of the hexagonal hole 51 , the longitudinal length of each of the grooves 23 and 23 a is preferably greater than half the length of the bus bar of the tail portion 20 .

In actual use, please refer to FIG. 6 , when the user wants to remove the screw 50 with the inner hexagonal hole 51 , he can insert the pneumatic wrench 40 or other rotating tool into the socket hole 11 , and insert the tail 20 into the screw In the hexagonal hole 51 within 50, the screw of the present invention can be disassembled by using tools such as the pneumatic wrench 40. When the tool is rotated, since the tail portion 20 is tapered, the tail portion 20 can be further tightly embedded in the hexagonal hole 51 due to the rotation, so that the screw 50 and the screw removal tool are rotated together. At this time, an air wrench can be used. 40 and other tools drive the screw removal tool and the screw 50 to rotate at one time, thereby removing the screw 50 .

It should be noted that, because the tail is tapered, even if the hexagonal socket of the screw is worn and rounded to different degrees, it can be adjusted by the depth at which the tail is inserted into the hexagonal hole to ensure the tightness of the tail. In addition, the present invention can also be used in hexagonal sockets that are not worn and rounded. For example, when a hexagonal screwdriver of the same size is lacking on site, the present invention can easily achieve the purpose of removing screws.

In view of the above, the screw removal tool provided by the present invention only needs to be matched with a rotating tool such as a pneumatic wrench, and can easily remove a screw with a hexagon socket, without the need for destructive procedures such as drilling, which not only saves labor and time, but also avoids Metal chips can be generated, and screws can be avoided. The tapered tail is suitable for hexagon sockets of different sizes, and the depth of embedding can be used to match the hexagon sockets with different degrees of wear and rounding. It is important that the The concave grooves make the tail also have uneven shape in the circumferential direction, which is more conducive to closely combining with the inner hexagon hole and ensures the smooth removal of the screw.

To sum up, the screw removal tool provided by the present invention can be used to easily remove the worn and rounded hexagon socket holes, avoiding damage to the screws, and can be applied to socket socket holes of different sizes or different degrees of wear, which is really relevant As expected by the industry, the above embodiments are only intended to illustrate and describe the technical content of the present invention.

X: axis

10: Head

20: tail

21: End face

22: Thread

23: Groove

30: Class Ministry

Claims (13)

A screw removal tool, comprising a head and a tail, the head is for socketing a hand tool, the tail is coaxial with the head, the tail is a frustum, and the end of the tail farther from the head has an end surface , the tail is tapered from the end closer to the head toward the end face, at least one thread protruding from the peripheral surface of the tail and extending spirally around an axis of the tail along the peripheral surface of the tail, at least one concave A groove is formed on the peripheral surface of the tail portion and staggered with the at least one thread, and one end of the at least one groove extends to the end surface; wherein, the end surface of the tail portion defines a circular outer edge contour, and the at least one groove An opening is formed on the end face of the tail, the portion of the outer edge of the end face of the tail passing through the opening and inside the opening is defined as an imaginary contour, and the opposite ends of the imaginary contour are respectively defined as a first end and a first end. Two ends, the shortest distance from each point of the outline of the opening to the imaginary outline is defined as a first length, the position on the outline of the opening with the largest first length is defined as a bottom, and the distance from the bottom to the first end The straight-line distance is not equal to the straight-line distance from the bottom to the second end. The screw removal tool of claim 1, wherein the head has a socket hole, the socket hole is a non-circular hole, and the tail is coaxial with the socket hole. The screw removal tool as claimed in claim 1, wherein the head is a polygonal cylinder. The screw removal tool according to claim 2, further comprising a step portion, the step portion is a cylinder and is coaxial with the socket hole, the step portion is connected between the head portion and the tail portion, and the step portion is connected between the head portion and the tail portion. The outer diameter is smaller than the outer diameter of the head. The screw removal tool of claim 1, wherein the contour of the opening of the at least one groove is a straight line between the first end and the bottom, and the contour of the opening of the at least one groove is between the second end and the bottom. There is also a straight line between the bottoms, so that the at least one groove is surrounded by two side walls. The screw removal tool of claim 1, wherein the contour of the opening of the at least one groove is a concave arc shape, so that the at least one groove is surrounded by a concave arc surface. The screw removal tool of claim 1, wherein the depth of the at least one groove increases from an end close to the head portion toward an end close to the end face of the tail portion. The screw removal tool of claim 1, wherein the longitudinal extension direction of the at least one groove is not parallel to the bus bar of the tail. The screw removal tool of claim 1, wherein the tail is a truncated cone and its taper is not lower than 0.175 and not higher than 0.28. The screw removal tool of claim 9, wherein the longitudinal length of the at least one groove is greater than half the length of the busbar of the tail. The screw removal tool according to any one of claims 1 to 10, wherein the number of the at least one groove is an integer multiple of six, and the grooves are equiangularly distributed around the axis of the tail. The screw removal tool according to any one of claims 1 to 10, wherein the end surface of the tail portion is a concave arc surface whose center is more concave than the periphery. The screw removal tool according to any one of claims 1 to 10, wherein the number of the at least one screw thread is an integer multiple of six.

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