Anti-theft screw

Abstract

The utility model relates to the technical field of screws, and discloses an anti-theft screw which comprises a screw head and a sleeve, a round hole is formed in the bottom of the sleeve, the screw head is placed in the sleeve, a screw rod is fixed on one side of the screw head, one end of the screw rod penetrates through the round hole and extends outwards, a round plate is placed above the sleeve, and the round plate is fixed on the sleeve. An inner ring plate is fixed to the bottom of the circular plate, the outer wall of the inner ring plate is in threaded connection with the inner wall of the sleeve, a rectangular inserting groove is formed in the upper portion of the circular plate, and a rectangular baffle is arranged in the rectangular inserting groove. When a screw needs to be disassembled, a straight screwdriver needs to be inserted into the rectangular inserting groove to rotate to open the circular plate block, the screw in the sleeve can be disassembled, the rectangular baffle is arranged on the upper portion in the rectangular inserting groove, then the rectangular baffle is fixed through the fixing mechanism, and therefore the screw can be disassembled. Therefore, the straight screwdriver can be prevented from being inserted into the rectangular slot.

Description

TECHNICAL FIELD

[0001] The utility model relates to screw technical field more specifically, the utility model relates to a kind of theftproof screw. BACKGROUND

[0002] In real life, many public facilities and important equipment on screw often face the risk of being stolen or maliciously disassembled, once the screw is stolen, it may cause damage to the device, not only will cause property loss, but also may pose a threat to safety.

[0003] The traditional screw structure is relatively simple, and can be easily disassembled using a general tool, which cannot meet the demand of theft prevention, and the existing theftproof screw adopts a special groove on the screw head, which can only be disassembled by using a special tool. Although this method can achieve a certain anti-theft effect, when the user needs to disassemble the screw, it cannot be disassembled without a special tool, which increases the inconvenience of use. UTILITY MODEL CONTENT

[0004] In order to overcome the shortcomings of the prior art, the utility model provides a theftproof screw to solve the problems in the background art.

[0005] In order to achieve the above purpose, the utility model provides the following technical scheme: a theftproof screw, comprising a screw head and a sleeve, the sleeve bottom is provided with a round hole, the screw head is placed in the sleeve, the screw head is fixed with a screw rod on one side, and the screw rod extends outward through the round hole, a circular plate is placed above the sleeve, the circular plate is fixed with an inner ring plate at the bottom, and the inner ring plate is connected with the sleeve inner wall through threads, a rectangular slot is provided above the circular plate, a rectangular baffle is arranged in the rectangular slot, springs are fixed on both sides of the bottom of the rectangular baffle, one end of the two springs is fixed on both sides of the bottom of the rectangular slot, and a fixing mechanism is arranged between the rectangular baffle and the circular plate.

[0006] As a preferred technical scheme of the utility model, the screw rod is made of CrMo alloy steel.

[0007] As a preferred technical scheme of the utility model, the surface of the screw rod is plated with a double-layer zinc-chromium coating.

[0008] As a preferred technical scheme of the utility model, a spring washer is sleeved on one side of the screw rod.

[0009] As a preferred technical scheme of the utility model, the fixed mechanism includes threaded slot, limiting hole, jack, bolt, the threaded slot is set in the rectangular slot side wall, the limiting hole is set in the rectangular baffle one side, the jack is set in the other side wall of the rectangular slot, and the circular plate side wall of one end of the jack is provided with a groove, one end of the bolt passes through the jack and limiting hole and is inserted in the threaded slot, and the bolt and the threaded slot are connected through the thread.

[0010] As a preferred technical scheme of the utility model, the groove is placed with a rubber plug.

[0011] Compared with the prior art, the utility model has the advantages that:

[0012] 1, the utility model discloses a screw head is placed in the sleeve, then the screw rod is moved and passes through the round hole at the bottom of the sleeve to use, when the screw is fixed on the equipment, then the circular plate is installed on the sleeve top through the thread, so as to protect the screw head.

[0013] 2, the utility model discloses when needing to disassemble the screw, need to insert the flat screwdriver into the rectangular slot and rotate to open the circular plate, can only then disassemble the screw in the sleeve, through the rectangular baffle setting in the rectangular slot top, then through the fixed mechanism and fixing the rectangular baffle, can block the flat screwdriver and insert the rectangular slot, if do not know how to release the fixed rectangular baffle, can not rotate the circular plate, so can effectively prevent the theft of the screw by outsiders. DRAWINGS

[0014] Fig. 1 It is the three-dimensional structure schematic diagram of the utility model one kind of theftproof screw;

[0015] Fig. 2 It is the main view structure schematic diagram of the utility model one kind of theftproof screw;

[0016] Fig. 3 It is the side view structure schematic diagram of the utility model one kind of theftproof screw.

[0017] In the drawing: 1, screw rod;2, screw head;3, sleeve;4, inner ring plate;5, circular plate;6, rectangular slot;7, rectangular baffle;8, spring;9, bolt;10, limiting hole;11, threaded slot;12, groove;13, rubber plug;14, spring washer. CONCRETE IMPLEMENTATION

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] like Figs. 1 to 3 As shown, this utility model provides an anti-theft screw, including a screw head 2 and a sleeve 3. The bottom of the sleeve 3 has a round hole, and the screw head 2 is placed inside the sleeve 3. A screw rod 1 is fixed to one side of the screw head 2, and one end of the screw rod 1 passes through the round hole and extends outward. A circular plate 5 is placed on top of the sleeve 3. An inner ring plate is fixed to the bottom of the circular plate 5, and the outer wall of the inner ring plate is connected to the inner wall of the sleeve 3 by threads. The anti-theft screw is used by placing the screw head 2, which needs to be anti-theft, inside the sleeve 3, and then moving the screw rod 1 through the round hole at the bottom of the sleeve 3. After the screw is fixed on the equipment, the circular plate 5 is then installed on top of the sleeve 3 by threads to protect the screw head. The side wall of the circular plate 5 is smooth.

[0020] A rectangular slot 6 is provided above the circular plate 5. A rectangular baffle 7 is provided inside the rectangular slot 6. Springs 8 are fixed on both sides of the bottom of the rectangular baffle 7. One end of each spring 8 is fixed to the bottom sides of the rectangular slot 6. A fixing mechanism is provided between the rectangular baffle 7 and the circular plate 5. By inserting a flathead screwdriver into the rectangular slot 6 and rotating it, the circular plate 5 can be opened, thereby allowing the screws inside the sleeve 3 to be removed. By positioning the rectangular baffle 7 above the rectangular slot 6 and fixing it with the fixing mechanism, the flathead screwdriver can be prevented from being inserted into the rectangular slot 6.

[0021] Among them, screw 1 is made of 35CrMo alloy steel, and the surface of screw 1 is coated with a double layer of zinc-chromium coating. 35CrMo alloy steel has good comprehensive mechanical properties, with a tensile strength of over 1000MPa and a yield strength of around 850MPa, which can meet the connection requirements of various automotive components under high load conditions. Adding appropriate amounts of alloying elements such as chromium (Cr) and molybdenum (Mo) to the steel can effectively improve the hardenability, tempering stability and corrosion resistance of the steel. Chromium can form a dense oxide film on the surface of the steel, enhancing the steel's oxidation and corrosion resistance. Molybdenum can refine the grains, improve the strength and toughness of the steel, and make the screw less prone to deformation and breakage under high loads. The zinc and chromium elements in the zinc-chromium coating can form a dense protective film on the surface of screw 1, effectively blocking the contact between air, moisture and other corrosive media and the screw 1 substrate, thereby significantly improving the corrosion resistance of screw 1.

[0022] The spring washer 14 can effectively prevent loosening to a certain extent, especially for some occasions with vibration or impact, such as mechanical equipment, automobiles and the like, the spring washer 14 can provide additional fastening force and increase the reliability of connection.

[0023] The fixing mechanism comprises a threaded groove 11, a limiting hole 10, a bushing and a bolt 9, the threaded groove 11 is arranged on the side wall of the rectangular slot 6, the limiting hole 10 is arranged on one side of the rectangular baffle 7, the bushing is arranged on the other side wall of the rectangular slot 6, a groove 12 is arranged on the side wall of the circular plate 5 at one end of the bushing, the bolt 9 passes through the bushing and the limiting hole 10 and is inserted into the threaded groove 11, and the bolt 9 is connected with the threaded groove 11 through threads, the bolt 9 can be taken out from the limiting hole 10 by using a small screwdriver, and then a flat screwdriver is inserted into the rectangular slot 6 to press down the rectangular baffle 7, so that the rectangular baffle 7 can be pressed down, and the flat screwdriver can rotate the circular plate 5.

[0024] The rubber plug 13 is arranged in the groove 12, the rubber plug 13 arranged in the groove 12 can prevent others from finding the bolt 9, the color of the circular plate 5 and the rubber plug 13 is black, so that it is difficult for others to find the position of the groove 12, and the bolt 9 cannot be disassembled, and the rubber plug 13 can be pried out from the groove 12 when the user needs to disassemble the bolt 9.

[0025] The working principle and use process of the utility model are as follows: the screw head 2 needing to be prevented from being stolen is arranged in the sleeve pipe 3, the screw rod 1 is moved to pass through the circular hole at the bottom of the sleeve pipe 3, the circular plate 5 is installed above the sleeve pipe 3 through threads after the screw is fixed on the equipment, the rectangular baffle 7 is arranged above the rectangular slot 6, and the rectangular baffle 7 is fixed through the fixing mechanism, so that the flat screwdriver cannot be inserted into the rectangular slot 6, the screw cannot be disassembled if the fixing of the rectangular baffle 7 cannot be opened, and the effect of preventing theft is achieved.

[0026] When the user needs to disassemble the screw, the bolt 9 is taken out from the limiting hole 10 by using a small screwdriver, the rectangular baffle 7 is pressed down by using a flat screwdriver inserted into the rectangular slot 6, the flat screwdriver can be inserted into the rectangular slot 6, and the circular plate 5 can be opened by rotating, so that the screw in the sleeve pipe 3 can be disassembled.

[0027] It is to be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0028] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A theft-proof screw comprising a screw head (2) and a sleeve (3), characterized in that: The sleeve (3) is provided with a circular hole at the bottom, the screw head (2) is placed in the sleeve (3), one side of the screw head (2) is fixedly provided with a screw rod (1), one end of the screw rod (1) penetrates through the circular hole and extends outward, a circular plate (5) is placed above the sleeve (3), the circular plate (5) is fixedly provided with an inner ring plate at the bottom, and the outer wall of the inner ring plate is threadedly connected with the inner wall of the sleeve (3), the circular plate (5) is provided with a rectangular slot (6) at the top, the rectangular slot (6) is provided with a rectangular baffle (7), the rectangular baffle (7) is fixedly provided with springs (8) at the bottom on both sides, one end of the two springs (8) is fixedly arranged at the bottom on both sides of the rectangular slot (6), and a fixing mechanism is arranged between the rectangular baffle (7) and the circular plate (5).

2. The theft-proof screw according to claim 1, wherein: The screw rod (1) is made of 35CrMo alloy steel.

3. The theft-proof screw according to claim 1, wherein: The surface of the screw rod (1) is plated with a double-layer zinc-chromium coating.

4. The theft-proof screw according to claim 1, wherein: The screw rod (1) is provided with a spring washer (14) on one side.

5. The theft-proof screw of claim 1, wherein: The fixing mechanism comprises a threaded groove (11), a limiting hole (10), a bushing and a bolt (9), the threaded groove (11) is formed in the side wall of the rectangular slot (6), the limiting hole (10) is formed in one side of the rectangular baffle (7), the bushing is formed in the other side wall of the rectangular slot (6), a recess (12) is formed in the side wall of the circular plate (5) at one end of the bushing, one end of the bolt (9) penetrates through the bushing and the limiting hole (10) and is inserted into the threaded groove (11), and the bolt (9) is threadedly connected with the threaded groove (11).

6. A tamperproof screw as claimed in claim 5, wherein: The recess (12) is provided with a rubber plug (13).

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