Twist-off type anti-theft bolt pair

Abstract

The utility model discloses a twist-off type anti-theft bolt pair, and relates to the technical field of anti-theft bolts. One end of the screw rod is provided with a semispherical end part, the plane of the semispherical end part is fixedly connected with the screw rod, the screw rod is provided with a smooth section from one end of the semispherical end part, and a threaded section is arranged from the smooth section of the screw rod to the tail end of the screw rod; the nut comprises a first connecting part, the first connecting part is of a cone frustum structure, a cylindrical first through hole is formed in the middle of the first connecting part, the size of the first through hole is matched with that of the screw rod, and an internal thread matched with the threaded section of the screw rod is arranged on the inner side wall of the first through hole; the small-diameter end of the first connecting part is connected with a second connecting part, the second connecting part is of an outer hexagonal structure, a second through hole is formed in the middle of the second connecting part, and the outer edge of the small-diameter end of the first connecting part is fixed to the edge of the second through hole of the second connecting part; the twisting-off force between the second connecting part and the first connecting part is larger than or equal to the minimum torque for installing the nut.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-theft bolts, in particular to a twist-off type anti-theft bolt pair. Background Art

[0002] Existing commonly used bolt and nut fasteners are indispensable parts for connecting mechanical parts and fixing devices. Bolt and nut fasteners are very convenient to use, easy to install and disassemble. However, for bolt and nut fasteners in infrastructure in the field, their safety is very important, such as bolt and nut fasteners used in infrastructure such as railways, highway bridges, transmission towers, microwave communication towers, etc.

[0003] There are two common types of anti-theft bolts: the first has a convex semicircular shape at one end of the screw, which restricts the bolt's direction during use; the second has a nut with a built-in steel ball and anti-theft spring. Both types of bolts are difficult to manufacture, especially the second type. Placing a steel ball and anti-theft spring inside the nut requires additional machining, which is limited by the processing technology and is difficult to achieve. Furthermore, the nut cannot be too small, making it difficult to produce small bolts and resulting in high production costs. Utility Model Content

[0004] To this end, an embodiment of the present invention provides a twist-off anti-theft bolt pair to solve the problems existing in the above-mentioned technology.

[0005] In order to achieve the above objectives, the present invention provides the following technical solutions:

[0006] A twist-off anti-theft bolt pair, comprising a screw and a nut, is characterized by:

[0007] One end of the screw is provided with a hemispherical end portion, the plane of the hemispherical end portion is fixedly connected to the screw, the screw is provided with a smooth section starting from one end of the hemispherical end portion, and a threaded section is provided from the smooth section to the end of the screw;

[0008] The nut includes a first connecting portion, which is configured as a truncated cone structure. A cylindrical first through-hole is axially penetrated in the middle of the first connecting portion, and the size of the first through-hole is adapted to the size of the screw. An inner sidewall of the first through-hole is provided with an internal thread adapted to the screw thread segment. A second connecting portion is connected to one end with a smaller diameter of the first connecting portion. The second connecting portion is an external hexagonal structure, and a second through-hole is formed in the middle of the second connecting portion. The outer edge of the smaller diameter end of the first connecting portion is fixed to the edge of the second through-hole of the second connecting portion.

[0009] The nut is threadedly connected to the screw rod through the first connecting portion;

[0010] The twisting force between the second connecting portion and the first connecting portion is greater than or equal to the minimum torque for installing the nut.

[0011] Optionally, the spherical surface of the hemispherical end of the screw is provided with a smooth spherical surface.

[0012] Optionally, the outer surface of the first connecting portion is configured to be a smooth surface.

[0013] Optionally, the smooth section is adapted to the thickness of the object to be fixed, and an elastic washer is provided between the large-diameter end of the first connecting portion and the object to be fixed.

[0014] Optionally, the elastic washer is a spring washer.

[0015] The utility model has at least the following beneficial effects:

[0016] The utility model is composed of a first connecting portion with a truncated cone and a second connecting portion with an external hexagon. After the screw is fixed to the object to be fixed by the nut, since the twisting force between the second connecting portion and the first connecting portion is greater than or equal to the minimum torque for installing the nut, the second connecting portion and the second connecting portion can be twisted off by continuing to twist the second connecting portion, and the first connecting portion fixes the object. Moreover, since the first connecting portion has a truncated cone structure and the end of the screw has a hemispherical structure, conventional tools cannot twist the screw and the nut, thereby realizing the anti-theft function and having low production costs.

[0017] The utility model sets the twisting force between the second connecting part and the first connecting part to be greater than or equal to the minimum torque for installing the nut, so that the second connecting part can be disconnected after the first connecting part of the nut is tightened, thereby preventing under-tightening or over-tightening. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the prior art and the present invention, the following briefly introduces the drawings required for describing the prior art and the embodiments of the present invention. Obviously, the drawings described below are merely illustrative, and those skilled in the art can derive other drawings based on the provided drawings without inventive effort.

[0019] The structures, proportions, sizes, etc. illustrated in this specification are intended only to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented. Any structural modifications, changes in proportions, or adjustments in sizes shall remain within the scope of the technical contents disclosed herein without affecting the efficacy and objectives of the present invention.

[0020] Figure 1This is a schematic structural diagram of a nut from a first perspective according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of a nut according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of a screw and nut fixing structure according to an embodiment of the present invention;

[0023] Figure 4 The figure is a schematic diagram of a nut-breaking structure according to an embodiment of the present invention.

[0024] Description of reference numerals:

[0025] 1. Screw; 101. Smooth section; 102. Threaded section; 2. Nut; 201. First connecting portion; 202. First through-hole; 203. Second connecting portion; 204. Second through-hole; 3. Hemispherical end; 4. Spring washer. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0027] In the description of the present invention, unless otherwise specified, "plurality" means two or more. The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are intended to distinguish the objects referred to. For schemes with a sequential flow, this terminology does not necessarily need to be understood as describing a specific order or sequence. For schemes with device structures, this terminology does not distinguish between importance, positional relationships, etc.

[0028] In addition, the terms "including", "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that have been explicitly listed, but may also include other steps or units that are not explicitly listed but are inherent to these processes, methods, products or apparatuses, or steps or units that are added based on further optimization solutions conceived by the present invention.

[0029] like Figures 1-4 As shown, a twist-off anti-theft bolt pair disclosed in the present utility model includes a screw rod 1 and a nut 2;

[0030] One end of the screw 1 is provided with a hemispherical end 3, the plane of the hemispherical end 3 is fixedly connected to the screw 1, the screw 1 is provided with a smooth section 101 starting from one end of the hemispherical end 3, and a threaded section 102 is provided from the smooth section 101 to the end of the screw 1;

[0031] The nut 2 includes a first connecting portion 201, which is configured as a truncated cone structure. A cylindrical first through-hole 202 is axially formed in the middle of the first connecting portion 201. The size of the first through-hole 202 matches the size of the screw 1. The inner sidewall of the first through-hole 202 is provided with an internal thread that matches the threaded section 102 of the screw 1. The smaller end of the first connecting portion 201 is connected to a second connecting portion 203. The second connecting portion 203 has an external hexagonal structure and a second through-hole 204 is formed in the middle of the second connecting portion 203. The outer edge of the smaller end of the first connecting portion 201 is fixed to the edge of the second through-hole 204 of the second connecting portion 203.

[0032] The nut 2 is threadedly connected to the screw 1 through the first connecting portion 201;

[0033] The twisting force between the second connecting portion 203 and the first connecting portion 201 is greater than or equal to the minimum torque for installing the nut 2 .

[0034] The screw 1 is divided into three parts: a hemispherical end 3, a smooth section 101, and a threaded section 102. The spherical surface of the hemispherical end is smooth, and the smooth section 101 of the screw 1 is fixed on one side of the flat surface. The smooth section 101 and the threaded section 102 are integrally provided, and the diameter of the smooth section 101 is the same as the maximum diameter of the thread teeth of the threaded section 102. The length of the smooth section 101 is set according to the thickness of the fixed object, and the length of the threaded section 102 is slightly longer than the length of the nut 2.

[0035] The above-mentioned nut 2 consists of an integrally formed first connecting portion 201 and a second connecting portion 203. The first connecting portion 201 is a truncated cone structure with a smooth outer surface. The second connecting portion 203 is an external hexagonal nut 2 structure. The end with a smaller diameter of the first connecting portion 201 is fixed to the second connecting portion 203, and a first through hole 202 is axially penetrated on the first connecting portion 201. An internal thread is arranged inside the first through hole 202 to be connected to the threaded segment 102 of the screw 1, and the end with a smaller diameter of the first connecting portion 201 has its outer edge connected to the inner edge of the second connecting portion 203. The size of the connecting part depends on the size of the twisting force. The inner diameter of the second connecting portion 203 is smaller than the size of the screw 1. The second connecting portion 203 only serves as a torsional member, not as a connecting structure. The external hexagonal corner of the second connecting portion 203 can be adapted to conventional torque wrenches or power tools, etc.

[0036] When the torque on the second connecting part 203 is greater than the twisting force, the second connecting part 203 and the first connecting part 201 can be twisted off, the first connecting part 201 remains on the screw 1, and the second connecting part 203 is removed. At this time, since one end of the screw 1 is a hemispherical end 3 and the other end is a frustum-shaped first connecting part 201, both are circular structures and cannot be operated by conventional tools. Therefore, they will not be easily disassembled, ensuring the integrity of the fixed structure and preventing the fixed structure from being removed.

[0037] The smooth section 101 is adapted to the thickness of the object to be fixed, and an elastic washer is provided between the large-diameter end of the first connecting portion 201 and the object to be fixed.

[0038] The elastic washer is a spring washer 4.

[0039] Providing a spring washer 4 between the object to be fixed and the first connecting portion 201 can improve the stability of the fixation between the nut 2 and the screw rod 1 and further prevent the nut 2 and the screw rod 1 from loosening.

[0040] The above specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0041] The technical features of the above embodiments can be combined arbitrarily (as long as there is no contradiction in the combination of these technical features). In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

[0042] The above description of the present invention is relatively specific and detailed through a general explanation and specific embodiments. It should be noted that variations and modifications to these specific embodiments are possible without departing from the spirit of the present invention, and all such variations and modifications fall within the scope of protection of this application. Therefore, the scope of protection of this patent application shall be determined by the appended claims.

Claims

1. A twist-off anti-theft bolt pair, comprising a screw and a nut, characterized in that: One end of the screw is provided with a hemispherical end portion, the plane of the hemispherical end portion is fixedly connected to the screw, the screw is provided with a smooth section starting from one end of the hemispherical end portion, and a threaded section is provided from the smooth section to the end of the screw; The nut includes a first connecting portion, which is configured as a truncated cone structure. A cylindrical first through-hole is axially penetrated in the middle of the first connecting portion, and the size of the first through-hole is adapted to the size of the screw. An inner sidewall of the first through-hole is provided with an internal thread adapted to the screw thread segment. A second connecting portion is connected to one end with a smaller diameter of the first connecting portion. The second connecting portion is an external hexagonal structure, and a second through-hole is formed in the middle of the second connecting portion. The outer edge of the smaller diameter end of the first connecting portion is fixed to the edge of the second through-hole of the second connecting portion. The nut is threadedly connected to the screw rod through the first connecting portion; The twisting force between the second connecting portion and the first connecting portion is greater than or equal to the minimum torque for installing the nut.

2. The twist-off anti-theft bolt pair according to claim 1, characterized in that: The spherical surface of the hemispherical end of the screw is provided with a smooth spherical surface.

3. The twist-off anti-theft bolt pair according to claim 1, characterized in that: The outer surface of the first connecting portion is configured to be a smooth surface.

4. The twist-off anti-theft bolt pair according to claim 1, characterized in that: The smooth section is adapted to the thickness of the object to be fixed, and an elastic washer is provided between the large-diameter end of the first connecting portion and the object to be fixed.

5. The twist-off anti-theft bolt pair according to claim 4, characterized in that: The elastic washer is a spring washer.

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