Bolt assembly with anti-theft and anti-loosening functions
By incorporating positioning recesses, positioning protrusions, and insertion holes in the bolt assembly, combined with an irregular hole design, the problems of poor anti-loosening and anti-theft effects of existing bolts are solved, achieving higher security and anti-theft performance.
Patent Information
- Application Number
- CN202421243575.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-06-03
AI Technical Summary
Existing bolts are inadequate in preventing loosening and theft, especially cotter pins, which are easily pulled out, resulting in poor effectiveness in preventing loosening and theft.
A bolt assembly was designed, including a screw, a nut, and a cotter pin. The nut has retaining teeth, the screw has a positioning notch in the tail hole, and the cotter pin has a positioning protrusion on the pin shank. It is fixed by inserting a rod into the insertion hole. The head of the screw has an irregular hole that requires a special tool to rotate.
It achieves excellent anti-loosening and anti-theft effects. The cotter pin is difficult to pull out and requires a special tool to turn the screw, thus improving the safety of the bolt.
Smart Images
Figure CN222315635U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fasteners, in particular to a bolt assembly with anti-theft and anti-loosening functions. Background Art
[0002] Bolts are a common fastener that is mainly used to fasten two or more parts together. They are used in conjunction with nuts to achieve a fastened connection. Bolts usually have threads on one end and a head (such as a hexagonal head, a cross-slot head, etc.) on the other end, which is easy to turn with a wrench or screwdriver. Bolts are indispensable connecting elements in the fields of automobiles, construction, machinery, etc.
[0003] In order to prevent the screw from loosening, some existing bolts use slotted nuts in conjunction with screws with holes at the tail and cotter pins to prevent the screw and nut from rotating relative to each other. After the nut is tightened, the cotter pin is inserted into the nut slot and the hole at the tail of the screw, and the tail of the cotter pin is pulled apart to prevent the nut and the screw from rotating relative to each other. The bolts of this structure have excellent anti-loosening performance, but since the cotter pin is easy to be manually pulled out from the nut slot and the hole at the tail of the screw, after pulling out the cotter pin, the user can use a wrench to make the nut and the screw rotate relative to each other, so it does not have an anti-theft effect. However, in many usage scenarios, this type of bolt is required to have a certain anti-theft effect. In view of this, the present application makes improvements. Utility Model Content
[0004] The utility model provides a bolt assembly with anti-theft and anti-loosening functions, which solves the above problems existing in the use process of the prior art.
[0005] The technical solution of the utility model is achieved as follows: a bolt assembly with anti-theft and anti-loosening functions, including a screw, a nut and a cotter pin, the screw including a head and a threaded column, the nut threadedly fits on the threaded column, the nut is integrally formed with a latch tooth at an end away from the head, a plurality of latch teeth are provided and are equidistantly distributed on the nut at a circumference, a nut groove is provided between each adjacent latch tooth, a screw tail hole is radially penetrated on the threaded column, the cotter pin is used to insert into the nut groove and the screw tail hole, the cotter pin includes a first pin rod and a second pin rod connected to each other, the first pin rod and the second pin rod are symmetrically arranged, the first pin rod and the second pin rod are both provided with a positioning convex portion bent and protruding toward the outside, and positioning recesses for the positioning convex portion to be inserted into are provided on both sides of the screw tail hole.
[0006] Preferably, a connecting rod is fixedly connected between the middle parts of the first pin rod and the second pin rod.
[0007] Preferably, two positioning protrusions on the first pin rod and the second pin rod are provided on both sides of the connecting rod.
[0008] Preferably, both ends of the first pin rod and the second pin rod are open.
[0009] Preferably, the positioning protrusion includes an outer arched surface that arches outward and fits in the positioning recess, and a recessed surface located on the inner side. The threaded column is provided with an insertion hole on the end away from the head, which penetrates to the two recessed surfaces corresponding to the first pin rod and the second pin rod. An insertion rod is inserted into the insertion hole with interference fit, and the end of the insertion rod is held between the two recessed surfaces corresponding to the first pin rod and the second pin rod.
[0010] Preferably, the end of the insertion rod is provided with a chamfer for easy insertion.
[0011] Preferably, the head is provided with a hexagonal star-shaped special-shaped hole, and a convex column is also provided in the middle of the special-shaped hole.
[0012] In summary, the beneficial effects of the present invention are:
[0013] 1. After the nut is tightened on the threaded column of the screw, the cotter pin is inserted into the nut groove and the tail hole of the screw, and the end of the cotter pin is opened to prevent the nut and the screw from rotating relative to each other, thereby achieving a good anti-loosening effect. Because the first pin rod and the second pin rod in the cotter pin of the utility model are both provided with positioning protrusions that are bent and protruded toward the outside, and positioning recesses for the positioning protrusions to be inserted are provided on both sides of the tail hole of the screw, after the cotter pin is inserted into the tail hole of the screw, it is difficult to be pulled out, thereby achieving a certain anti-theft effect.
[0014] 2. By inserting the insertion rod into the insertion hole with interference fit, the end of the insertion rod is abutted between the concave surfaces of the two corresponding positioning protrusions on the first pin and the second pin, so it is difficult to pull out the cotter pin, thereby achieving a good anti-theft effect.
[0015] 3. The head of the screw is a hexagonal star-shaped special-shaped hole, and a convex column is also provided in the middle of the special-shaped hole. Therefore, a special tool is needed to enable a wrench to rotate the screw, further improving the anti-theft effect of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0018] Figure 2 It is a schematic diagram of the explosion of the structure of the utility model;
[0019] Figure 3 It is a side view of the utility model;
[0020] Figure 4 for Figure 3 Schematic diagram of the cross-section structure in the AA direction;
[0021] Figure 5 This is a schematic diagram of the structure of the utility model when observing from one side of the head;
[0022] Figure 6 A special tool required for a wrench to turn the head of the screw rod of the utility model;
[0023] Figure 7 for Figure 6 Schematic diagram of the structure when observed from another angle.
[0024] In the figure: 1. screw; 11. head; 111. special-shaped hole; 112. boss; 12. threaded column; 121. screw tail hole; 122. positioning notch; 123. insertion hole; 2. nut; 21. latching tooth; 22. nut groove; 3. cotter pin; 31. first pin rod; 32. second pin rod; 33. positioning convex part; 331. outer arched surface; 332. recessed surface; 34. connecting rod; 4. insertion rod; 41. easy-insertion chamfer. DETAILED DESCRIPTION
[0025] The following will be combined with the attached embodiment of the utility model Figure 1-7 , clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0026] Example:
[0027] like Figures 1 to 5As shown, the utility model discloses a bolt assembly with anti-theft and anti-loosening functions, including a screw rod 1, a nut 2 and a cotter pin 3, wherein the screw rod 1 includes a head 11 and a threaded column 12, and the nut 2 is threadedly fitted on the threaded column 12, and the nut 2 is integrally formed with a latch tooth 21 at one end away from the head 11, and a plurality of latch teeth 21 are provided and are equidistantly distributed on the nut 2 at a circumference, and a nut groove 22 is provided between each adjacent latch tooth 21, and a screw tail hole 121 is radially penetrated on the threaded column 12, and the cotter pin 3 is used to insert the nut groove 22 and the screw tail hole 121. Specifically, the cotter pin 3 includes a first pin rod 31 and a second pin rod 32 connected to each other, and the first pin rod 31 and the second pin rod 32 are symmetrically arranged, and a positioning protrusion 33 bent and protruding toward the outside is provided on the first pin rod 31 and the second pin rod 32, and positioning recesses 122 for the positioning protrusion 33 to be inserted into are provided on both sides of the screw tail hole 121.
[0028] Among them, the specific way of connecting the first pin rod 31 and the second pin rod 32 is: a connecting rod 34 is fixedly connected between the middle parts of the first pin rod 31 and the second pin rod 32, and the ends of the first pin rod 31 and the second pin rod 32 are both open. Generally, only one end of a traditional cotter pin is open, so the end that is not open can easily be hooked by objects such as wire and then pulled out, which is not conducive to anti-theft. Therefore, both ends of the cotter pin 3 of the utility model are open, and it can only be pulled out by clamping it with tools such as pliers and requiring great force. This structure is also conducive to improving the anti-theft effect.
[0029] Furthermore, two positioning protrusions 33 on the first pin rod 31 and the second pin rod 32 of the utility model are provided on both sides of the connecting rod 34, which can further make it difficult to pull out the cotter pin 3 after being inserted into the tail hole 121 of the screw, thereby improving the anti-theft effect.
[0030] Furthermore, the positioning protrusion 33 includes an outer arched surface 331 that arches outward and fits in the positioning recess 122, and a recessed surface 332 located on the inner side. The threaded column 12 is provided with a socket 123 at the end away from the head 11, which penetrates to the two recessed surfaces 332 corresponding to the first pin rod 31 and the second pin rod 32. An insertion rod 4 is inserted into the insertion hole 123 with interference fit, and the end of the insertion rod 4 is abutted between the two recessed surfaces 332 corresponding to the first pin rod 31 and the second pin rod 32. In this way, it is difficult to pull out the cotter pin 3, thereby achieving a good anti-theft effect.
[0031] Among them, an easy-insertion chamfer 41 is provided at the end of the insertion rod 4, which is convenient for being inserted between the two recessed surfaces 332 corresponding to the first pin rod 31 and the second pin rod 32. Because the first pin rod 31 and the second pin rod 32 are inserted into the screw tail hole 121, although the cotter pin 3 has a certain deformation reset ability, the positioning protrusion 33 may also be deformed. However, as the insertion rod 4 is inserted through the easy-insertion chamfer 41, the positioning protrusion 33 can be stretched open, so that the positioning protrusion 33 is pressed by the insertion rod 4 in the positioning recess 122.
[0032] In the present invention, the head 11 of the screw 1 is provided with a hexagonal star-shaped special-shaped hole 111, and a protrusion 112 is also provided in the middle of the special-shaped hole 111. Therefore, a special tool is required to enable the wrench to rotate the screw 1. The special tool is as follows: Figure 6 and Figure 7 As shown, the anti-theft effect of the utility model can be further improved.
[0033] When the present invention is in use, after the nut 2 is tightened on the threaded column 12 of the screw rod 1, the cotter pin 3 is inserted into the nut groove 22 and the screw tail hole 121, and the two ends of the first pin rod 31 and the second pin rod 32 in the cotter pin 3 are opened outward to prevent the nut 2 and the screw rod 1 from rotating relative to each other, thereby achieving a good anti-loosening effect. Because the first pin rod 31 and the second pin rod 32 in the cotter pin 3 of the present invention are both provided with a positioning protrusion 33 bent and protruding toward the outside, and the two sides of the screw tail hole 121 are provided with a positioning recess 122 for the positioning protrusion 33 to be inserted into, after the cotter pin 3 is inserted into the screw tail hole 121, it is difficult to be pulled out. Then, the insertion rod 4 is inserted through the insertion hole 123 between the two recessed surfaces 332 corresponding to the first pin rod 31 and the second pin rod 32, so that it is difficult to pull out the cotter pin 3, thereby achieving a good anti-theft effect.
[0034] It should also be pointed out that the terms used in the present invention, such as "front", "rear", "vertical", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention.
[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A bolt assembly with anti-theft and anti-loosening functions, comprising a screw rod, a nut and a cotter pin, characterized in that: The screw includes a head and a threaded column, the nut thread is fitted on the threaded column, the nut is integrally formed with a latch tooth at the end away from the head, a plurality of latch teeth are provided and are equidistantly distributed on the nut at a circumference, a nut groove is provided between each adjacent latch tooth, a screw tail hole is radially penetrated on the threaded column, the cotter pin is used to insert into the nut groove and the screw tail hole, the cotter pin includes a first pin rod and a second pin rod connected to each other, the first pin rod and the second pin rod are symmetrically arranged, and the first pin rod and the second pin rod are both provided with a positioning protrusion bent and protruding toward the outside, and positioning recesses for the positioning protrusion to be inserted into are provided on both sides of the screw tail hole.
2. A bolt assembly with anti-theft and anti-loosening functions according to claim 1, characterized in that: A connecting rod is fixedly connected between the middle parts of the first pin rod and the second pin rod.
3. The bolt assembly with anti-theft and anti-loosening functions according to claim 2, characterized in that: Two positioning protrusions on the first pin rod and the second pin rod are arranged on both sides of the connecting rod.
4. The bolt assembly with anti-theft and anti-loosening functions according to claim 2, characterized in that: Both ends of the first pin rod and the second pin rod are open.
5. The bolt assembly with anti-theft and anti-loosening functions according to claim 1, characterized in that: The positioning protrusion includes an outer arched surface that arches outward and fits in the positioning recess, and a recessed surface located on the inner side. The threaded column is provided with an insertion hole that penetrates between the two recessed surfaces corresponding to the first pin rod and the second pin rod at the end away from the head. An insertion rod is inserted into the insertion hole with interference fit, and the end of the insertion rod is held between the two recessed surfaces corresponding to the first pin rod and the second pin rod.
6. The bolt assembly with anti-theft and anti-loosening functions according to claim 5, characterized in that: The end of the insertion rod is provided with an easy-insertion chamfer.
7. The bolt assembly with anti-theft and anti-loosening functions according to claim 1, characterized in that: The head is provided with a hexagonal star-shaped special-shaped hole, and a convex column is also provided in the middle of the special-shaped hole.