Nut Releasing Prevention Device for Bolt

Abstract

The present invention relates to a bolt nut loosening prevention device that prevents a nut from unintentionally loosening from a bolt due to external vibration or impact, wherein the device comprises: a first body (10) having a shaft portion (3) connected to the center of the bolt head portion (2) for a certain length, having an insertion hole (11) and a plurality of extraction holes (12) formed inwardly at the upper portion and screw threads formed on the outer surface; a second body (20) connected to the first body for a certain length, having a storage groove (21) formed on the inner surface and screw threads formed on the outer surface, and divided into a plurality of parts; and a link member (30) that is hinge-connected to the first body (10) and the second body (20) with multiple joints to allow the second body (20) to be raised, lowered, and spread apart from the first body (10). The present invention prevents the nut screw-coupled to the first body from unintentionally loosening or separating from the bolt due to external vibration or impact when the second body, which is connected to the first body by a link member, is divided into multiple parts and fixedly coupled to the outer surface of the first body, thereby preventing safety accidents. Furthermore, when the bolt nut loosening prevention device is applied to the wheels of a vehicle or to various machines or devices that generate vibration and impact, it is designed to prevent secondary problems in addition to the inherent problems of the corresponding device.

Description

Technology Field

[0001] The present invention relates to a device for preventing the loosening of a nut for bolt fastening, and more specifically, to a device for preventing the nut from unintentionally loosening from the bolt due to external vibration or impact, for a fixed object joined by fastening with a bolt and a nut. Background Technology

[0002] Generally, bolts and nuts are mechanical elements with spirals used to join two or more fixed objects. Bolts and nuts utilize the principle of the inclined plane; that is, they incorporate an inclined plane into traditional nails, which are typically hammered, allowing them to be tightened by rotating. Furthermore, as the bolt and nut rotate to tighten, the travel distance increases, meaning that while the amount of work performed remains the same, the required force decreases. In other words, the inclined plane principle dictates that increasing the force reduces the travel distance, while decreasing the force increases the travel distance. Moreover, bolts and nuts secure objects using friction. Specifically, friction is the force that hinders the movement of two objects between their contact surfaces. The magnitude of friction is influenced by surface roughness and the normal force. Mathematically, this can be expressed as F = μN. Here, F represents the friction force, μ represents the coefficient of friction, and N represents the normal force. Such bolts are divided into a head section for tightening or loosening and a threaded section corresponding to the shaft. The head section is approximately hexagonal in shape, while the threaded section is approximately cylindrical with threads formed on its outer surface. The structure of the head and tip of a bolt is formed in various shapes and forms depending on the application. A nut is fastened to the shaft of the bolt and is roughly ring-shaped, with a hexagonal outer surface and threads formed on the inner surface for fastening with the bolt. The structure of the nut is formed in various shapes and forms depending on the application. Furthermore, washers with various functions and shapes are interposed between the bolt and the nut to increase the bonding force to the fixed object. These bolts and nuts are fastened to various fixed objects to exert fixing force on the fixed object.

[0003] In the past, when a fixed object secured by fastening bolts and nuts was subjected to poor maintenance or continuous vibration or impact from the outside, the bolts and nuts failed to maintain their fastened state and gradually loosened, resulting in a problem where the bolts and nuts could not perform their normal fastening and fixing functions. For example, when a vehicle's wheel is fixed to an axle or brake disc using bolts and nuts, the nut may loosen from the bolt and the wheel may detach while vibration caused by continuous wheel rotation or external impact is applied. Consequently, if a wheel detaches from the axle or brake disc of a vehicle traveling on the road, it can cause serious safety accidents to the moving vehicle, and there was also a problem of secondary safety accidents where the detached wheel could cause harm to vehicles traveling in adjacent lanes or following vehicles. Prior art literature

[0004] Korean Registered Patent Publication No. 10-1825694 (Published on 2018.00.00) Korean Registered Patent Publication No. 10-2194640 (Published on 2020.12.23) Korean Published Patent Publication No. 10-2018-0039856 (Published on 2018.04.19) Korean Published Patent Publication No. 10-2025-0000714 (Published on 2025.01.03) The problem to be solved

[0005] The present invention aims to solve the above problem and is intended to prevent bolts and nuts fixedly fastened to a fixed object from unintentionally loosening due to external vibrations or shocks.

[0006] In addition, another objective of the present invention is to prevent a nut fastened to a bolt from separating from the shaft of the bolt by horizontally dividing the shaft of the bolt, then vertically dividing it into multiple parts, and fixing it to the outside of the shaft. means of solving the problem

[0007] To achieve the above objective, the present invention provides a bolt nut anti-loosening device comprising: a first body having a shaft portion connected to the center of the bolt head portion for a certain length, having an insertion hole and a plurality of withdrawal holes formed inwardly at the upper portion and screw threads formed on the outer surface; a second body connected to the first body for a certain length, having a storage groove formed on the inner surface and screw threads formed on the outer surface, and divided into a plurality of parts; and a link member hinge-coupled to the first body and the second body with multiple joints to allow the second body to be raised, lowered, and spread apart from the first body.

[0008] In addition, in the present invention, the link member may include a first link having a first connecting part formed with a lifting shaft protruding from one side that is lifted and lowered to guide grooves formed on both sides of the extraction hole of the first body, and a second connecting part formed with a first hinge shaft protruding from both sides that is hinged to one side of the second link; a second link having a third connecting part formed with one side that is hinged to the first hinge shaft of the second connecting part, and a fourth connecting part formed with the other side that is hinged to one side of the third link; and a third link having a fifth connecting part formed with one side that is hinged to the fourth connecting part, and a sixth connecting part formed with the other side that is hinged to a storage groove formed on the inside of the second body.

[0009] In addition, in the present invention, a fixing hole is formed on the outer surface of the first body, a fixing projection is formed protrudingly on the inner side of the storage groove, and a through hole is formed in the center of the sixth connecting part so that the fixing projection can pass through the through hole and be inserted and fixed in the fixing hole.

[0010] In addition, in the present invention, the insertion hole may be connected from the upper center of the first body to the lower end of the extraction hole.

[0011] In addition, the present invention may further include a fixing cap that fixes and combines the upper portions of the first body and the second body while the second body, which is connected to the first body by a link member, is divided and fixed in close contact with the outer surface of the first body. Effects of the invention

[0012] According to the present invention, when a fixed object is fixedly coupled to the shaft portion of a bolt, a nut screwed onto a first body is fixedly coupled to the outer surface of the first body after the second body, which is connected to the first body by a link member, is divided into multiple parts, thereby preventing the nut from unintentionally loosening or separating from the bolt due to external vibration or impact, thus preventing the occurrence of safety accidents. Furthermore, when the bolt nut loosening prevention device is applied to the wheels of a vehicle or to various machines or devices that generate vibration and impact, it has the advantage of preventing secondary problems that may occur in addition to the inherent problems of the device. Brief explanation of the drawing

[0013] FIG. 1 is a perspective view showing the state before operation of a bolt nut loosening prevention device according to an embodiment of the present invention. FIG. 2 is a perspective view showing the state after operation of the bolt nut loosening prevention device according to the present invention. FIG. 3 is a perspective view showing a part of the first body of a bolt nut loosening prevention device according to the present invention. FIG. 4 is a cross-sectional view showing the first body of a bolt nut loosening prevention device according to the present invention. FIG. 5 is a perspective view showing the second body of a bolt nut loosening prevention device according to the present invention. FIG. 6 is a perspective view showing a link member of a bolt nut loosening prevention device according to the present invention. FIG. 7 is an exemplary diagram showing the combined state of the second body and the link member of the bolt nut loosening prevention device according to the present invention. FIG. 8 is a plan view showing a bolt nut loosening prevention device according to the present invention. FIG. 9 is a cross-sectional view showing the coupling of a fixing projection of a second body to a fixing hole of a first body in a bolt nut loosening prevention device according to the present invention. FIG. 10 is an exploded perspective view showing another embodiment of a bolt nut loosening prevention device according to the present invention. FIG. 11 is a schematic diagram illustrating a fixing cap that is fixedly coupled to a bolt nut loosening prevention device according to the present invention. FIG. 12 is a schematic diagram exemplarily illustrating the process of inserting and fixing a link member into a first body in a bolt nut loosening prevention device according to the present invention. FIG. 13 is a schematic diagram showing the operation regarding the conversion and fixed coupling of the first body to the second body of a bolt nut loosening prevention device according to the present invention. FIG. 14 is a sample photograph showing the second body divided into three and four parts from the first body in a bolt nut loosening prevention device according to the present invention. Figure 15 is a photograph showing the result of a vibration test performed with a standard bolt on a bolt nut anti-loosening device according to the present invention. Specific details for implementing the invention

[0014] Hereinafter, an embodiment of a bolt nut loosening prevention device according to the present invention will be described in detail with reference to the attached drawings.

[0015] Referring to the perspective views of FIG. 1 and FIG. 2, the present invention prevents a nut (4) fastened to a bolt (1) from unintentionally loosening. The bolt (1) is connected to a certain length from the center of a polygonal head portion (2) including a cylindrical or hexagonal shape, and is divided into a shaft portion (3) having screw threads formed on its outer surface. The shaft portion (3) is divided into a first body (10) and a second body (20) that are horizontally divided, and the first body (10) and the second body (20) are connected by a link member (30). The second body (20) is vertically divided into multiple parts.

[0016] In FIGS. 3 and 4, a plurality of extraction holes (12) are formed to a certain depth inwardly perpendicular to the edge of the upper part of the first body (10). Then, an insertion hole (11) is formed in an approximately diagonal direction from the center of the upper part of the first body (10) to the lower part of each extraction hole (12). The insertion hole (11) is connected from the center of the upper part of the first body (10) to the approximately center of the extraction hole (12). And a fixing hole (15) is formed on the outer surface corresponding to the extraction hole (12) formed in the first body (10).

[0017] In FIG. 5, the second body (20) is extended from the first body (10) with approximately the same diameter and length, and the second body (20) can be vertically divided into multiple parts, such as two, three, or four. A storage groove (21) is formed on the inner surface of the second body (20), and screw threads are formed on the outer surface. Also, depending on the number of divisions of the second body (20), the number of corresponding extraction holes (12) of the first body (10) will also vary.

[0018] In FIG. 6, the link member (30) is hinge-connected in the form of a multi-joint between the first body (10) and the second body (20), and the link member (30) connects the first body (10) to the second body (20) so that it can be raised and lowered and spread out at a certain distance. The link member (30) is divided into a first link (31) that rises and falls from the extraction hole (12) of the first body (10), a second link (35) that is hinge-connected to the first link (31) and is located at the upper end of the first body (10) or inserted into the extraction hole (12) of the first body (10), and a third link (40) that is hinge-connected to the second link (35) and is inserted into the storage groove (21) of the second body (20) or inserted into the extraction hole (12) of the first body (10).

[0019] As a link member (30), the first link (31) is composed of a first connecting part (32) and a second connecting part (33), and the first connecting part (32) has a lifting shaft (34) protrudingly formed to be lifted and lowered in guide grooves (13) formed on each side of the extraction hole (12) of the first body (10). The guide grooves (13) formed in the extraction hole (12) of the first body (10) support the lifting and lowering of the lifting shaft (34) protruding on both sides of the first connecting part (32) and prevent the lifting shaft (34) from being unintentionally separated and slipping out of the extraction hole (12). The second connecting part (33) has a first hinge shaft (38) protrudingly formed on both sides to be hinged to one side of the second link (35).

[0020] The second link (35) is composed of a third connecting part (36) and a fourth connecting part (37), the third connecting part (36) is hinge-coupled to the first hinge shaft (38) of the second connecting part (33), and the fourth connecting part (37) is hinge-coupled to one side of the third link (40) and the second hinge shaft (44). By combining the second connecting part (33) and the third connecting part (36), the second connecting part (33) may have a protrusion shape and the corresponding third connecting part (36) may have a groove formed therein to be hinge-coupled, or the second connecting part (33) may have a groove shape and the corresponding third connecting part (36) may have a protrusion formed therein to be hinge-coupled.

[0021] The third link (40) is composed of a fifth connecting part (41) and a sixth connecting part (42). The fifth connecting part (41) is hinge-coupled to the fourth connecting part (37) by a second hinge shaft (44), and the sixth connecting part (42) is hinge-coupled to the hinge hole (23) on the side of the storage groove (21) formed on the inner side of the second body (20) by a third hinge shaft (45). Due to the combination of the fourth connecting part (37) and the fifth connecting part (41), the fourth connecting part (37) may have a protrusion shape and the corresponding fifth connecting part (41) may have a groove formed therein to be hinge-coupled, or the fourth connecting part (37) may have a groove shape and the corresponding fifth connecting part (41) may have a protrusion formed therein to be hinge-coupled. A through hole (43) is formed in the center of the sixth connecting part (42).

[0022] In FIGS. 7 to 9, the through hole (43) formed in the third link (40) is a space provided for inserting a fixing projection (22) that protrudes into the storage groove (21) of the second body (20). Furthermore, the fixing projection (22) that protrudes into the storage groove (21) may be fixedly coupled by a press fit into the fixing hole (15) formed on the outer surface of the first body (10), or a structure may be formed for coupling between the end of the fixing projection (22) and the inner side of the fixing hole (15).

[0023] In addition, in FIG. 10, a coupling hole (16) is formed on the upper surface of the first body (10), and correspondingly, a plurality of coupling protrusions (24) are formed on the lower surface of the second body (20). That is, when the coupling protrusions (24) of the second body (20) are inserted into the coupling hole (16) of the first body (10), the first body (10) and the second body (20) can maintain a vertical connection intact.

[0024] In FIG. 11a, the fixing cap (50) securely connects the upper portions of the first body (10) and the second body (20) while the second body (20), which is connected to the first body (10) by a link member (30), is split and securely fixed to the outer surface of the first body (10). In FIG. 11b, the fixing cap (50) has an open bottom and a receiving hole (51) formed inside, thereby further securely connecting the first body (10) and the second body (20) in FIG. 11c and FIG. 11d, and also preventing the connection between the first body (10) and the second body (20) from being exposed to the outside, thus preventing corrosion of the first body (10) and the second body (20). Screw threads are formed on the inner surface of the fixing cap (50) so that they can be screw-coupled with the screw threads formed on the outer surface of the first body (10) and the second body (20) that are fixedly coupled. In addition, the fixing cap (50) may be made of an elastic material to improve the fixing force.

[0025] In the cross-section showing the first body (10) of FIG. 12, FIG. 12a shows that the insertion hole (11) formed inside the first body (10) is initially used to insert a link member (30) so that the link member (30) is coupled to the withdrawal hole (12). This is done so that the link member (30) is connected to the first body (10) and the second body (20).

[0026] That is, in FIG. 12b, the link member (30) is inserted into the insertion hole (11) through the upper center of the first body (10) while the first link (31), the second link (35), and the third link (40) of the link member (30) are each hinge-connected. At this time, the first link (31) of the link member (30) is inserted into the insertion hole (11) first. FIG. 12c is inserted into the insertion hole (11) and then into the corresponding withdrawal hole (12) into which the link member (30) is to be inserted. FIG. 12d is made so that the link member (30) inserted through the insertion hole (11) stands upright in the corresponding withdrawal hole (12). This can be achieved by tilting the bolt (1) at a certain angle or laying it horizontally so that the link member (30) stands upright. FIG. 12e shows the link member (30) standing upright within the extraction hole (12) being pulled out to the top of the extraction hole (12) of the first body (10). At this time, the first body (10) may be rotated 180 degrees so that the link member (30) is exposed in the extraction hole (12). Additionally, FIG. 12f shows the first link (31) and the second link (35) of the link member (30) being bent approximately at a right angle along the first hinge axis (38), and the second link (35) and the third link (40) being bent approximately at a right angle along the second hinge axis (44). Accordingly, the second body (20) is connected through the hinge holes (23) on both sides of the storage groove (21) of the second body (20), which is hinge-coupled to the sixth connecting part (42) of the third link (40) and the third hinge shaft (45).

[0027] Next, the operation of the bolt nut loosening prevention device according to the present invention is explained. FIG. 13 is explained with reference to the second body (20) of the bolt (1) being divided into four parts.

[0028] That is, in FIG. 13a, the bolt (1) maintains a vertical state between the horizontally divided first body (10) and the second body (20). At this time, in FIG. 13b, after the bolt (1) penetrates the fixed object, a nut (4) is screwed through the second body (20) and the first body (10) of the shaft portion (3). In FIG. 13c, when the nut (4) is screwed, the second body (20), which is horizontally divided from the first body (10), is raised so that the nut (4) does not unintentionally loosen from the shaft portion (3) of the bolt (1). At this time, the link member (30), which was partially inserted into the extraction hole (12) of the first body (10), is pulled out along the second body (20). The first body (10) rises to the top of the guide groove (13) formed in the extraction hole (12) through the lifting shaft (34) protruding from both sides of the first link (31) of the link member (30). In FIG. 13d, when the second body (20) rises to the top of the first body (10), the second body (20) spreads out radially. At this time, the first link (31) and the second link (35) of the link member (30) are connected by the first hinge shaft (38), the second link (35) and the third link (40) are connected by the second hinge shaft (44), and the third link (40) is connected by the third hinge shaft (45) hinged to the storage groove (21) of the second body, so that the hinge action causes the second body to spread out laterally. In FIG. 13e, the second body (20) is spread open so that the first link (31) and the second link (35) of the link member (30) are approximately perpendicular. Then, the third link (40) of the link member (30) will be hinged at approximately a right angle in the storage groove (21) of the second body (20). Also, in FIG. 13f, the spread second body (20) is lowered downward. At this time, the second link (35) and the third link (40) of the link member (30) are approximately perpendicular, and the third link (40) will be inserted into the lower part of the storage groove (21) of the second body (20). Furthermore, the fixing projection (22) protruding from the storage groove (21) of the second body (20) is inserted into the fixing hole (15) formed on the outer surface of the first body (10).Accordingly, the second body (20), connected to the first body (10) by a link member (30), is fixed in close contact with the side of the first body (10). Therefore, the diameter of the shaft portion (3) is expanded by the connection of the second body (20) to the first body (10), so that the nut (4) does not loosen or separate from the shaft portion (3) without being removed. Additionally, after the second body (20) is fixedly connected to the outer surface of the first body (10), if a fixing cap (50) is fitted over the first body (10) and the second body (20) to fix them together, the shaft portion (3) of the bolt (1) will maintain an even more secure fixed state.

[0029] Meanwhile, in order to separate from the connection of the bolt (1) and the nut (4), the connection of the shaft portion (3) of the first body (10) and the second body (20) can be returned to its original state in the reverse order of FIGS. 13a to 13f, and the nut (4) fixedly connected to the shaft portion (3) can be separated.

[0030] FIG. 14a is a photograph showing an embodiment in which the shaft portion (3) of the bolt (1) is divided into three parts, and FIG. 14b is a photograph showing an embodiment in which the shaft portion (3) of the bolt (1) is divided into four parts. Accordingly, the shaft portion (3) of the bolt (1) can be applied by dividing it into two to four parts, and the total length of the shaft portion (3) and the horizontal division position of the first body (10) and the second body (20) can be applied by taking into consideration the thickness of the nut (4) and the thickness of the object to be fixed.

[0031] FIG. 15 shows an experimental example of a bolt nut loosening prevention device according to the present invention. When a bolt (1) made of the structure and configuration according to the present invention and a general comparison bolt (100) are each fixed to a fixed object (101), a vibration generating device (102) is operated so that a certain frequency of vibration is transmitted to the bolt (1) of the present invention and the comparison bolt (100). As a result, it was found that the nut of the comparison bolt (100) was loosened from the bolt after a certain period of time, but the bolt (1) of the present invention continued to maintain its initial connection state.

[0032] Therefore, the bolt nut loosening prevention device according to the present invention can prevent the nut (4) from loosening or separating from the bolt (1) due to external vibration or impact when the nut (4) screw-coupled to the first body (10) is fixedly coupled to the outer surface of the first body (10) after the second body (20), which is connected from the first body (10) to the link member (30), is divided into multiple parts. This prevents the occurrence of safety accidents. Furthermore, when the bolt nut loosening prevention device of the present invention is applied not only to a vehicle but also to various machines or devices where vibration and impact occur, it can prevent secondary problems that may arise in addition to the inherent problems of the corresponding device.

[0033] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by such embodiments. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention. Explanation of the symbols

[0034] 1: Bolt 2: Head 3: Shaft 4: Nut 10: First body 11: Insertion hole 12: Pull-out hole 13: Guide groove 15: Fixing hole 16: Connecting hole 20: Second body 21: Storage groove 22: Fixing projection 23: Hinge hole 24: Connecting projection 30: Link member 31: First link 32: First connecting part 33: Second connecting part 34: Lifting shaft 35: Second link 36: Third connecting part 37: Fourth connecting part 38: First hinge shaft 40: Third link 41: Fifth connecting part 42: Sixth connecting part 43: Through hole 44: Second hinge shaft 45: Third hinge shaft 50: Fixed cap 51: Receiving hole 100: Bolt to be compared 101: Fixed object 102: Vibration generating device

Claims

Claim 1 A bolt nut anti-loosening device comprising: a first body (10) having a shaft portion (3) connected to the center of the head portion (2) of the bolt for a certain length, wherein an insertion hole (11) and a plurality of extraction holes (12) are formed inwardly at the upper portion and screw threads are formed on the outer surface; a second body (20) connected to the first body for a certain length, having a storage groove (21) formed on the inner surface and screw threads formed on the outer surface, and divided into a plurality of parts; and a link member (30) hinge-coupled to the first body (10) and the second body (20) at multiple joints to allow the second body (20) to be raised, lowered, and spread apart from the first body (10). Claim 2 In claim 1, the link member (30) comprises a first link (31) having a first connecting part (32) formed with a lifting shaft (34) protruding from one side that is lifted and lowered to guide grooves (13) formed on each side of the extraction hole (12) of the first body (10), and a second connecting part (33) having a first hinge shaft (38) protruding from both sides that is hinged to one side of the second link (35); a second link (35) having a third connecting part (36) formed with one side hinged to the first hinge shaft (38) of the second connecting part (33), and a fourth connecting part (37) formed with the other side hinged to one side of the third link (40); and a fifth connecting part (41) formed with one side hinged to the fourth connecting part (37), and the other side being on the inside of the second body (20). A bolt nut anti-loosening device comprising a third link (40) having a sixth connecting part (42) that is hinge-connected to a formed storage groove (21). Claim 3 In paragraph 2, a fixing hole (15) is formed on the outer surface of the first body (10), a fixing projection (22) is formed protrudingly on the inner side of the storage groove (21), and a through hole (43) is formed in the center of the sixth connecting part (42), so that the fixing projection (22) passes through the through hole (43) and is inserted and fixed into the fixing hole (15), thereby preventing the bolt nut from loosening. Claim 4 In claim 1, the insertion hole (11) is connected from the upper center of the first body (10) to the lower end of the extraction hole (12), forming a bolt nut anti-loosening device. Claim 5 A bolt nut anti-loosening device according to claim 1, further comprising a fixing cap (50) that fixes and connects the upper portions of the first body (10) and the second body (20) while the second body (20), which is connected to the first body (10) by a link member (30), is divided and fixed in close contact with the outer surface of the first body (10).

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