WO2021056169A1

WO2021056169A1 - Anti-theft screw and driving tool thereof

Info

Publication number: WO2021056169A1
Application number: PCT/CN2019/107449
Authority: WO
Inventors: Yi Shi; Qiaozhong XU
Original assignee: Neutron Holdings, Inc.
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2021-04-01

Abstract

An anti-thief screw (100) and a matching anti-theft screwdriver (400). The anti-theft screw(100) includes a screw shaft (102) including at least one thread twisted along a first direction (107); and a screw head (101) at one end of the screw shaft (102), including a plurality of working surfaces formed on an end surface of the screw head (101) to withstand a torque force (106) that drives the anti-theft screw (100) along or against the first direction (107), each of the plurality of working surfaces extends along a longitudinal direction, the longitudinal directions of the plurality of working surfaces do not point to a first common center, and a normal direction of each of the plurality of working surface does not point to a second common center. The anti-theft screwdriver (400) includes an end surface matching the shape of an end portion of the anti-theft screw (100).

Description

ANTI-THEFT SCREW AND DRIVING TOOL THEREOF

TECHNICAL FIELD

The present invention generally relates to an anti-theft screw and its related driving tool, more particularly to an anti-theft screw having a non-standard form of working surface and a driving tool for engaging the working surface.

BACKGROUND

Some valuable devices can be placed in a public area and secured with traditional fastening bolts or screws. In such a case, people can use ordinary tools to remove the bolts or the screws and steel the devices. The traditional anti-theft way is to destructively weld the bolts or screws used to secure the devices, which will waste a lot of screws or bolts. So there is a need to develop an economical anti-theft screw.

SUMMARY

To solve the above-mentioned problems of the conventional screws, the present application provides a new type of anti-theft screw. By designing a unique working structure at an end of the anti-theft screw, it will be difficult for an ordinary tool to engage with the anti-theft screw. Moreover, even if an ordinary tool can structurally engage with the working structure of the anti-theft screw, the ordinary tool can easily slip off from the working structure when it tries to screw the anti-theft screw, thereby achieving an anti-theft effect. The present application also provides a screwdriver specially designed for the anti-theft screw, which can be used to screw and unscrew the anti-theft screw.

A first aspect of the present invention relates to an anti-theft screw, including a screw shaft and a screw head on at one end of the screw shaft. The screw shaft includes at least one thread winding along a first direction; and the screw head includes a plurality of working surfaces formed on an end surface of the screw head for withstanding a torque force that drives the anti-theft screw along or against the first direction, wherein each of the plurality of working surfaces extending along a longitudinal direction, and the longitudinal directions of the plurality of working surfaces do not point to a first common center.

According to some embodiments, each of the plurality of working surfaces is a long sidewall of a groove formed on an end portion of the screw head.

According to some embodiments, the long sidewall is inclined.

According to some embodiments, each of the plurality of working surfaces is a long sidewall of a protrusion formed on an end portion of the screw head.

According to some embodiments, the long sidewall is inclined

According to some embodiments, each of the plurality of working surface has a normal direction that does not point to a second common center.

According to some embodiments, the longitudinal directions of the plurality of working surfaces are tangent to a common cylinder.

According to some embodiments, the groove includes a bottom surface, and at least a portion of the bottom surface is inclined.

According to some embodiments, the end surface of the screw head is a concave surface.

According to some embodiments, the end surface of the screw head is a convex surface.

A second aspect of the present invention relates to anti-theft screwdriver, including an end surface matching a shape of an end portion of an anti-theft screw, wherein the end surface includes: a plurality of working surfaces formed on the end surface to apply a torque force to the anti-theft screw, wherein each of the plurality of working surfaces extends along a longitudinal direction, and the longitudinal directions of the plurality of working surfaces do not point to a third common center.

According to some embodiments, the screwdriver has a T-shape, including a traverse section and a vertical section.

According to some embodiments, the end surface is located at an end of the traverse section.

According to some embodiments, the end surface is located at an end of the vertical section.

According to some embodiments, each of the working surfaces is a long sidewall of a groove formed on the end surface of the anti-theft screwdriver.

According to some embodiments, the long sidewall is inclined.

According to some embodiments, each of the plurality of working surface has a normal direction that does not point to a fourth common center.

Other features of the present application will be set forth in part in the description which follows. The contents of the following figures and examples will become apparent to those skilled in the art based on the description. The detailed contents of the present application can be fully explained through practice or using the methods, apparatus, and combinations thereof set forth in the detailed examples described below.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure is further described in terms of exemplary embodiments. The foregoing and other aspects of embodiments of present disclosure are made more evident in the following detail description, when read in conjunction with the attached drawing figures.

FIG. 1a is a top view of an exemplary anti-theft screw according to some embodiments of the present disclosure;

FIG. 1b is a front view of an exemplary anti-theft screw according to some embodiments of the present disclosure;

FIG. 2a is top view of an exemplary anti-theft screw with inclined working surfaces according to some embodiments of the present disclosure;

FIGs. 2b and 2c are cross-sectional views of the inclined working surfaces along a direction of X-X as indicated in FIG. 2a;

FIG. 2d is a cross-sectional views of an inclined bottom surface of the working structure along a direction of Y-Y as indicated in FIG. 2a;

FIG. 3a and 3b are front views of an exemplary anti-theft screw with a non-flat top surface according to some embodiments of the present disclosure;

FIG. 4a is a front view of an exemplary anti-theft screwdriver according to some embodiments of the present disclosure; and,

FIG. 4b is a bottom view of an exemplary anti-theft screwdriver according to some embodiments of the present disclosure.

DETAILED DESCRIPTION

The present disclosure provides an anti-theft screw and a driving tool designed for the anti-theft screw, such as a screwdriver or a powered tool for driving screws. The anti-theft screw may include an uncommon recessive or protruding structure, such that an ordinary driving tool cannot easily find a pivot from the recessive or protruding structure of the screw head, rendering it the security against ill-intentioned disassembly and/or theft. Further, the recessive or protruding structure may have a groove or a protrusion that does not extend from a center of the screw head, thus a torque produced by rotating a conventional driving tool may be weakened. An ordinary driving tool can hardly unscrew the anti-theft screw since much larger torque is required and the tip of an ordinary driving tool may easily slip from the recessive or protruding structure.

The following description provides specific application scenarios and requirements of the present application in order to enable those skilled in the art to make and use the present application. Various modifications to the disclosed embodiments will be apparent to those skilled in the art. The general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the disclosure. Therefore, the present disclosure is not limited to the embodiments shown herein, but the broadest scope consistent with the claims.

The terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. As used herein, the singular forms “a” , “an” and “the” may include their plural forms as well, unless the context clearly indicates otherwise. When used in this disclosure, the terms “comprises” , “comprising” , “includes” and/or “including” refer to the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used in this disclosure, the term "A on B" means that A is directly adjacent to B (from above or below) , and may also mean that A is indirectly adjacent to B (i.e., there is some element between A and B) ; the term "A in B" means that A is all in B, or it may also mean that A is partially in B.

In view of the following description, these and other features of the present disclosure, as well as operations and functions of related elements of the structure, and the economic efficiency of the combination and manufacture of the components, may be significantly improved. All of these form part of the present disclosure with reference to the drawings. However, it should be clearly understood that the drawings are only for the purpose of illustration and description, and are not intended to limit the scope of the present disclosure. It is also understood that the drawings are not drawn to scale.

An anti-theft screw of the present disclosure may include a screw shaft and screw head connected thereon. The screw head may be located at one end of the screw shaft. The screw shaft may include at least one thread twisted along a first direction. The first direction may be a clockwise direction or an anti-clockwise direction. When the anti-theft screw is driven to rotate along the first direction, the anti-theft screw may be loosened or tightened.

The screw head may include a plurality of working surfaces formed on a top surface of the screw head to withstand a torque force that drives the anti-theft screw along or against the first direction. A driving tool (e.g., a screwdriver) may apply a torque force on a working surface to drive the anti-theft screw to rotate along the first direction or against the first direction. Each of the plurality of working surfaces may extend along a longitudinal direction. For instance, the working surface may be a long sidewall of a groove formed at an end of the screw head, and the longitudinal direction of the working surface may be a length direction of the long sidewall of the groove. For another instance, the working surface may be a long sidewall of a protrusion formed at the end of the screw head, and the longitudinal direction of the working surface may be a length direction of the long sidewall of the protrusion.

The longitudinal directions of the plurality of working surfaces may not point to a first common center. In some embodiments, the first common center may be a center of the screw head if the screw head is substantially circular or in another regular shape. The longitudinal direction of each working surface may not be perpendicular to a rotation direction of the screw head. Thus, the torque force applied to the working surface may not be perpendicular to the working surface of the screw head. In this way, if a conventional driving tool does not match the plurality of working surfaces, it may be difficult for the conventional driving tool to properly engage with the working surfaces. Further, even if a conventional driving tool can engage with the working surfaces, the tip of the driving tool may easily slip off from the screw head when the it tries to screw or unscrew the anti-theft screw. In some embodiments, the longitudinal directions of the plurality of grooves or protrusions may be tangent to a common cylinder. In some embodiments, normal directions of each of the plurality of working surface of the screw head do not point to a second common center.

FIG. 1a is a top view of an exemplary anti-theft screw according to some embodiments of the present disclosure. FIG. 1b is a front view of an exemplary anti-theft screw according to some embodiments of the present disclosure.

As shown in FIG. 1a and 1b, an anti-theft screw 100 may include a screw shaft 102 and a screw head 101 connected thereon. The screw head 101 may be located at one end of the screw shaft 102. The screw shaft 102 may include at least one thread twisted along a first direction. The first direction may be an anti-clockwise direction 107. When the anti-theft screw is driven to rotate along the first direction, the anti-theft screw may be loosened.

The screw head 101 may include a plurality of working structures (e.g., a working structure 103-1, a working structure 103-2, a working structure 103-3, etc. ) formed on a top surface 105. In some embodiments, the working structure may be a groove or a protrusion. As shown in FIG. 1b, the working structures 103-1, 103-2, and 103-3 are grooves in this embodiment. The screw head 101 may include a plurality of working surfaces (e.g., a working surface 104-1, a working surface 104-2, a working surface 104-3, a working surface 104-4, a working surface 104-5, and a working surface 104-6, etc. ) formed on an end surface of the screw head to withstand a torque force that drives the anti-theft screw along or against the first direction. The working surfaces 104-1 and 104-2 may be the long sidewalls of the working structure 103-1. The working surfaces 104-3 and 104-4 may be the long sidewalls of the working structure 103-2. The working surfaces 104-5 and 104-6 may be the long sidewalls of the working structure 103-3. Each of the plurality of working surfaces may extend along a longitudinal direction thereof. For example, the longitudinal direction of the working surface 104-1 may be a length direction along the working surface 104-1, and the longitudinal direction of the working surface 104-3 may be a length direction along the working surface 104-3. A driving tool (e.g., a screwdriver) may apply the torque force 106 to the working surface 104-6 to drive the anti-theft screw 100 to rotate along the anti-clockwise direction 107 to loosen the anti-theft screw 100.

The longitudinal directions of the plurality of working surfaces may not point to a first common center O. The first common center O may be a center of the screw head 101. The plurality of working surfaces may not extend from the first common center O. The longitudinal direction of each working surface may not be perpendicular to a rotation direction (e.g., the anti-clockwise direction 107) of the screw head. Thus, the torque force 106 applied to the working surface 104-6 may not be perpendicular to the working surface 104-6. Since the torque force applied to a working surface is not perpendicular to the working surface, in the case where a conventional driving tool does not match the plurality of working surfaces, the tip of this drive tool may easily slip off the screw head when it tries to unscrew the anti-theft screw.

In some embodiments, the longitudinal directions of the plurality of working structures (e.g., a working structure 103-1, a working structure 103-2, a working structure 103-3, etc. ) may be tangent to a common cylinder 108.

FIG. 2a is top view of an exemplary anti-theft screw with inclined working surfaces according to some embodiments of the present disclosure. FIGs. 2b and 2c are cross-sectional views of the working structure 202 along an X-X direction as indicated in FIG. 2a. FIG. 2d is a cross-sectional view of the working structure 203 along an Y-Y direction as indicated in FIG. 2a..

As shown in FIGs. 2a-2d, the screw head 206 of the anti-theft screw 200 may include a plurality of working structures (e.g., a working structure 201, a working structure 202, a working structure 203, etc. ) formed on a top surface thereof. The working structure may include a plurality of working surfaces. For example, the working structure may include working surfaces 204-1 and 204-2. Compared the working surfaces illustrated in FIG. 1a, the working surfaces shown in FIG. 2a are inclined, in other words, the working surfaces shown in FIG. 2a are not perpendicular to the top surface of the screw head 206. For example, if the working structure 202 is a groove structure, a cross section along the X-X direction as shown in FIG. 2b may be formed, which is an inverted trapezoidal cross section. If the working structure 202 is a protrusion structure, a cross section along the X-X direction as shown in FIG. 2c may be formed, which is a trapezoidal cross section. Since the working surfaces are not perpendicular to the top surface of the screw head, if a conventional driving tool cannot match the plurality of working surfaces, the tip of the drive tool may easily slip off the screw head when it is used to screw or unscrew the anti-theft screw.

In some embodiments, the working structure may further include a bottom surface. For example, the working structure 203 may include a bottom surface 205 as shown in FIG. 2a. In some embodiments, the bottom surface may be a flat surface. In some embodiments, the bottom surface may be an inclined surface as shown in FIG. 2d (an inclined surface is a surface that is not parallel to a horizontal plane) . As a result, the working structure 203 has a wedge shape, which is deep at one end and shallow at another end. Compared with a flat bottom surface, since the working structure 203 is shallower, the inclined bottom surface may have reduced area of the working surface (e.g., the working surfaces 204-1 and 204-2) , which makes the tip of a drive tool easily slip off the screw head when it is used to screw or unscrew the anti-theft screw if this drive tool does not match the working surfaces.

FIG. 3a and 3b are front views of an exemplary anti-theft screw with a non-flat top surface according to some embodiments of the present disclosure.

As shown in FIG. 3a and 3b, an anti-theft screw 300 may include a screw shaft 302 and a screw head 301 connected thereon. The screw head 301 may be located at one end of the screw shaft 302. The screw head 301 may include a top surface 303. In some embodiments, the top surface 303 may be a convex surface as shown in FIG. 3a. A portion of the top surface 303 at the edge of the screw head 301 may be lower than a portion of the top surface 303 at the center of the screw head 301. In some embodiments, the top surface 303’ may be a concave surface as shown in FIG. 3b. A portion of the top surface 303’ at the edge of the screw head 301 may be higher than a portion of the top surface 303’ at the center of the screw head 301. The working surfaces or the working structures as illustrated in FIGs. 1a-1b and FIGs. 2a-2d may be formed on the top surface 303, 303’ of the screw head 301. If a conventional driving tool does not match the concave or convex top surface of the anti-theft screw, the tip of this driving tool may easily slip off the screw head when the conventional driving tool apply a torque force to screw or unscrew the anti-theft screw.

FIG. 4a is a front view illustrating an exemplary driving tool according to some embodiments of the present disclosure. For example, the driving tool may be an anti- theft screwdriver.

The anti-theft screwdriver may have an end surface matching the shape of an end portion of an anti-theft screw. The end surface of the anti-theft screwdriver may include a plurality of matching working surfaces to apply a torque force that drives the anti-theft screw to rotate along or against the first direction. Each of the plurality of matching working surfaces may extend along a longitudinal direction thereof. For instance, the matching working surface may be a long sidewall of a groove formed on the end portion of anti-theft screwdriver, and the longitudinal direction of the matching working surface may be a length direction of the long sidewall of the groove. For another instance, the matching working surface may be a long sidewall of a protrusion formed on the end surface of the anti-theft screwdriver, and the longitudinal direction of the matching working surface may be a length direction of the long sidewall of the protrusion. If the working surfaces of the anti-theft screw are formed in a groove, then the matching working surfaces of the anti-theft screwdriver may be formed on a protrusion matching the groove. If the working surfaces of the anti-theft screw is formed on a protrusion, the matching working surface of the anti-theft screwdriver may be formed in a groove matching the protrusion.

The longitudinal directions of the plurality of matching working surfaces of the anti-theft screwdriver may not point to a third common center. In some embodiments, the third common center may be a center of the end surface of the anti-theft screwdriver if the end surface is substantially circular or in another regular shape. The longitudinal direction of each matching working surface of the anti-theft screwdriver may not be perpendicular to a rotation direction of the screw head. In some embodiments, normal directions of each of the plurality of matching working surface of the anti-theft screwdriver does not point to a fourth common center.

In some embodiments, each of the matching working surfaces is a long sidewall of a groove formed on the end surface of the anti-theft screwdriver. The long sidewall of the groove formed on the end surface of the anti-theft screwdriver may be inclined to match the working surface of the protrusion formed on the top surface of the anti-theft screw. The longitudinal directions of the plurality of grooves formed on the end surface of the anti-theft screwdriver may be tangent to a common cylinder.

In some embodiments, each of the matching working surfaces is a long sidewall of a protrusion formed on the end surface of the anti-theft screwdriver. The long sidewall of the protrusion formed on the end surface of the anti-theft screwdriver may be inclined to match the working surface of the groove formed on the top surface of the anti-theft screw. The longitudinal directions of the plurality of protrusions formed on the end surface of the anti-theft screwdriver may be tangent to a common cylinder.

As shown in FIG. 4a, the anti-theft screwdriver 400 may have a T-shape, or it may be in a bar shape. However, the present disclosure has no limit to the specific shape of the anti-theft screwdriver, as long as it can match the corresponding part of the anti-theft screw and operate properly The screwdriver 400 may include a traverse section 401 and a vertical section 402. The traverse section 401 may include an end portion 403; the vertical section 402 may include an end portion 404. The end portion 403 and/or the end portion 404 may have an end surface matching the top surface 110 of an anti-theft screw. For example, the end portion 403 may have an end surface 410 matching the shape of the end portion 110 of an anti-theft screw, and/or the end portion 404 may have an end surface 420 matching the shape of the end portion 110 of an anti-theft screw.

FIG. 4b is a bottom view illustrating an exemplary driving tool according to some embodiments of the present disclosure. The anti-theft screwdriver may end

surfaces

410, 420 matching the shape of a top surface of an anti-theft screw. The shape of the end portion 403 may be the same as the shape of the end portion 404. Of course, the shape of the end portion 403 may be different from that of the end portion 404, in order to screw or unscrew anti-theft screws with various end portion shapes.

As shown in FIG. 4b, the end 404 of the anti-theft screwdriver 400 may include a plurality of working structures (e.g., a working structure 405, a working structure 406, a working structure 407, etc. ) formed on the end portion 404. The working structure of the anti-theft screwdriver 400 may match the working structure of the anti-theft screw 200 as illustrated in FIG. 2a. The working structure of the anti-theft screwdriver may include a plurality of matching working surfaces matches the working surfaces of an anti-theft screw as illustrated in FIG. 2a. For example, if the working structure of the anti-theft screw (e.g., the working

structures

201, 202 and 203) as illustrated in FIG. 2a are grooves, working structures of the anti-theft screwdriver (e.g., a working structure 405, a working structure 406, a working structure 407) may be protrusions matching the grooves. If the working structures of the anti-theft screw (e.g., the working

structures

201, 202 and 203) as illustrated in FIG. 2a are protrusions, the working structures of the anti-theft screwdriver (e.g., a working structure 405, a working structure 406, a working structure 407) may be grooves matching the protrusions.

In the process of screwing or unscrewing the anti-theft screw 200, the

end portion

403 or 404 of the anti-theft screwdriver 400 is engaged with a top end of the anti-theft screw 200, that is, the matching working surfaces on the

end portion

403 or 404 of the anti-theft screwdriver 400 are engaged with the working surfaces on an end of the anti-theft screw. A user may apply a torque force to the anti-theft screwdriver 400, the torque force is then transmitted to the working surfaces of the anti-theft screw 200 through the matching working surfaces of the anti-theft screwdriver 400. Since the anti-theft screwdriver has the end faces 410, 420 matching the shape of the end portion of the anti-theft screw, the matching working surfaces of the anti-theft screwdriver 400 and the working surfaces on the end portion of the anti-theft screw will not slip off from each other during an operating process. Therefore, the anti-theft screw 200 can be successfully screwed or unscrewed.

In view of the foregoing, it will be understood by those skilled in the art that although not explicitly stated herein, those skilled in the art will understand that the present application is intended to cover various changes, improvements and modifications of the embodiments. These changes, modifications, and improvements are intended to be made by the present disclosure and are within the spirit and scope of the exemplary embodiments of the present disclosure.

In addition, some of the terms in this application have been used to describe embodiments of the present disclosure. For example, "one embodiment" , "an embodiment" and/or "some embodiments" means that a particular feature, structure or characteristic described in connection with the embodiment may be included in at least one embodiment of the present disclosure. Therefore, it should be emphasized and understood that in various parts of the present disclosure, two or more references to "an embodiment" or "one embodiment" or "an alternate embodiment" are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined as appropriate in one or more embodiments of the present disclosure.

It should be understood that in the description of the embodiments of the present disclosure, to assist in understanding a feature and for the purpose of simplifying the present disclosure, sometimes various features may be combined in a single embodiment, or drawings, description thereof. Alternatively, various features may be described in different embodiments of the present application. However, this is not to say that a combination of these features is necessary, and it is entirely possible for those skilled in the art to understand that a part of these features may be extracted as a separate embodiment. That is to say, the embodiments in the present application can also be understood as the integration of a plurality of secondary embodiments. It is also true that the content of each of the sub-embodiments is less than all of the features of a single previously disclosed embodiment.

In some embodiments, numbers expressing quantities or properties used to describe or define the embodiments of the present application should be understood as being modified by the terms "about, " "approximate, " or "substantially" in some instances. For example, "about" , "approximately" or "substantially" may mean a ±20%change in the described value o unless otherwise stated. Accordingly, in some embodiments, the numerical parameters set forth in the written description and the appended claims are approximations, which may vary depending upon the desired properties sought to be obtained in a particular embodiment. In some embodiments, numerical parameters should be interpreted in accordance with the value of the parameters and by applying ordinary rounding techniques. Although a number of embodiments of the present application provide a broad range of numerical ranges and parameters that are approximations, the values in the specific examples are as accurate as possible.

Each of the patents, patent applications, patent application publications, and other materials, such as articles, books, instructions, publications, documents, products, etc., cited herein are hereby incorporated by reference, which are applicable to all contents used for all purposes, except for any history of prosecution documents associated therewith, any identical, or any identical prosecution document history, which may be inconsistent or conflicting with this document, or any such subject matter that may have a restrictive effect on the broadest scope of the claims associated with this document now or later. For example, if there is any inconsistent or conflicting in descriptions, definitions, and/or use of a term associated with this document and descriptions, definitions, and/or use of the term associated with any materials, the term in this document shall prevail.

Finally, it should be understood that the embodiments of the application disclosed herein are merely described to illustrate the principles of the embodiments of the application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed herein are by way of example only and not limitations. Those skilled in the art can adopt alternative configurations to implement the invention in this application in accordance with the embodiments of the present application. Therefore, the embodiments of the present application are not limited to those embodiments that have been precisely described in this disclosure.

Claims

An anti-theft screw, comprising:

a screw shaft including at least one thread twisted along a first direction; and

a screw head at one end of the screw shaft, including a plurality of working surfaces formed on an end surface of the screw head to withstand a torque force that drives the anti-theft screw along or against the first direction, wherein

each of the plurality of working surfaces extending along a longitudinal direction, and

the longitudinal directions of the plurality of working surfaces do not point to a first common center.
The anti-theft screw of claim 1, wherein each of the plurality of working surfaces is a long sidewall of a groove formed on an end portion of the screw head.
The anti-theft screw of claim 2, wherein the long sidewall is inclined.
The anti-theft screw of claim 1, wherein each of the plurality of working surfaces is a long sidewall of a protrusion formed on an end portion of the screw head.
The anti-theft screw of claim 4, wherein the long sidewall is inclined.
The anti-theft screw of claim 1, wherein each of the plurality of working surface has a normal direction that does not point to a second common center.
The anti-theft screw of claim 1, wherein the longitudinal directions of the plurality of working surfaces are tangent to a common cylinder.
The anti-theft screw of claim 2, wherein the groove includes a bottom surface, and at least a portion of the bottom surface is inclined.
The anti-theft screw of claim 1, wherein the end surface of the screw head is a concave surface.
The anti-theft screw of claim 1, wherein the end surface of the screw head is a convex surface.
An anti-theft screwdriver, comprising an end surface matching a shape of an end portion of an anti-theft screw, wherein the end surface includes:

a plurality of working surfaces formed on the end surface to apply a torque force to the anti-theft screw, wherein

each of the plurality of working surfaces extends along a longitudinal direction, and

the longitudinal directions of the plurality of working surfaces do not point to a third common center.
The anti-theft screwdriver of claim 11, wherein the screwdriver has a T-shape, including a traverse section and a vertical section.
The anti-theft screwdriver of claim 12, wherein the end surface is located at an end of the traverse section.
The anti-theft screwdriver of claim 12, wherein the end surface is located at an end of the vertical section.
The anti-theft screwdriver of claim 11, wherein each of the working surfaces is a long sidewall of a groove formed on the end surface of the anti-theft screwdriver.
The anti-theft screwdriver of claim 15, wherein the long sidewall is inclined.
The anti-theft screwdriver of claim 11, wherein each of the plurality of working surfaces is a long sidewall of a protrusion formed on an end portion of the screw head.
The anti-theft screwdriver of claim 17, wherein the long sidewall is inclined.
The anti-theft screwdriver of claim 11, wherein each of the plurality of working surface has a normal direction that does not point to a fourth common center.
The anti-theft screwdriver of claim 11, wherein the longitudinal directions of the plurality of working surfaces are tangent to a common cylinder.