Anti-loosening bolt assembly

Abstract

The present invention relates to an anti-loosening bolt assembly that prevents loosening of the bolt by ensuring a secure connection with the bolt through the lock washer and preventing the bolt from loosening by rotating the lock washer together with the bolt during the fastening process of the bolt and the lock washer. More specifically, the assembly comprises a bolt consisting of a bolt head and a shaft extending downward from the bolt head and having screw threads formed on its outer surface; and a disc-shaped lock washer having a hole through which a tooth pattern and a cam pattern are formed on the upper and lower surfaces, respectively, to prevent loosening when coupled between the bolt head and the object to be fastened, wherein the bolt head is characterized by having a locking rod protruding downward from one side of the cam pattern on the lower surface and being fitted into a groove formed outward from the hole of the lock washer.

Description

Technology Field

[0001] The present invention relates to an anti-loosening bolt assembly, and more specifically, to an anti-loosening bolt assembly in which, using a lock washer, the bolt is easily rotated in the fastening direction and rotation is prevented in the loosening direction, wherein the lock washer is rotated together with the bolt when the bolt is fastened, thereby preventing wear of the cam pattern formed on the bottom surface of the bolt head, which consists of an inclined surface and a stepped surface, and the cam pattern of the lock washer during the fastening process, and a lock is formed in the fastened state to firmly fasten the bolt and prevent the bolt from loosening. Background Technology

[0002] Generally, fastening means using bolts have been widely used since ancient times as a means to fasten, lock, or secure structures.

[0003] These bolts are configured to firmly fasten and secure a structure by being composed of a head formed in a predetermined shape and a shaft extending from the head and having threads formed on its surface, and by being fastened to a substrate or nut having threads machined on its inner surface.

[0004] However, fastening methods using bolts have the problem that contamination and lubricant may adhere to the screw joint, or that they may easily loosen due to prolonged external vibration and impact.

[0005] Accordingly, a structure in which a locking washer is inserted into the bolt to prevent the unauthorized loosening of such a bolt has been devised by the applicant and is disclosed in Public Patent No. 10-2018-0131038.

[0006] The above prior art provides the effect of increasing fastening force and preventing loosening due to vibration and impact by forming a locking washer with a disc-shaped body having a bolt insertion hole in the center, forming a cam pattern with continuous inclined and stepped surfaces on one side and a tooth pattern made of fine teeth on the other side, and forming a cam pattern corresponding to the cam pattern of the locking washer on the bottom surface of the bolt head, thereby allowing rotation in the fastening direction of the bolt and preventing rotation in the loosening direction.

[0007] However, during the process of tightening while the bolt is in contact with the lock washer, the lock washer remains stationary and only the bolt rotates to tighten until the bolt is fully tightened. Consequently, as the bottom surface of the bolt head and the cam pattern of the inclined surface and stepped surface of the lock washer continue to rub against each other while the bolt rotates, wear occurs on the inclined surface due to the friction between the cam pattern of the bolt head and the cam pattern of the lock washer. This results in a decrease in the locking function as well as the interlocking function of the bolt head and the lock washer, leading to a reduction in tightening force and a disadvantage in that the bolt can easily loosen due to vibration or impact. The problem to be solved

[0008] The objective of the present invention is to resolve the above-mentioned problems by providing an anti-loosening bolt assembly that achieves a greater effect in preventing bolt loosening along with a secure fastening, by preventing wear on the inclined surface and stepped surface of the bolt head by preventing friction between the cam pattern of the bolt head and the cam pattern of the lock washer when the bolt is fastened, and by forming a locking rod downwardly on one side of a cam pattern formed on the bottom surface of the bolt head and a stepped portion, and forming a groove in the inner circumference of the lock washer into which the locking rod is inserted, thereby allowing the bolt and the lock washer to be fastened in an integrated state. means of solving the problem

[0009] The present invention, as a means to achieve such an objective, comprises a bolt including a bolt head having a cam pattern formed on its bottom surface and a shaft extending downward from the bolt head and having screw threads formed on its outer surface; The present invention provides an anti-loosening bolt assembly comprising: a bolt head and a lock washer disposed between the bolt head and a fastening target; wherein the lock washer comprises a cam pattern formed on an upper surface, a tooth pattern formed on a lower surface and pressed into the fastening target, and a through hole formed in the center, wherein a locking rod protruding downward is formed on one side of the cam pattern on the lower surface of the bolt head, and a groove extending outward is formed in the through hole of the lock washer so that the locking rod is inserted and coupled into the groove, wherein when the bolt is fastened, the cam pattern of the bolt head and the cam pattern of the lock washer come into contact with each other and press the lock washer in the axial direction so that the tooth pattern is pressed into the fastening target (M), and when the bolt is rotated in reverse, the rotation of the lock washer is suppressed by the coupling of the locking rod and the groove, thereby preventing loosening.

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[0013] delete Effects of the invention

[0014] According to the present invention, when a bolt is fastened, it is rotated and fastened in a state combined with the lock washer through the engagement of the locking rod on the bottom surface of the bolt head and the groove of the lock washer. As a result, friction with the cam pattern of the lock washer is not generated during the bolt fastening process, thereby preventing wear on the inclined surface and the stepped surface, which enables a secure fastening of the bolt and has the effect of preventing the bolt from easily loosening due to vibration or impact in the fastened state. Brief explanation of the drawing

[0015] FIG. 1 is an exemplary perspective view of a bolt and a lock washer according to an embodiment of the present invention. FIG. 2 is a plan view of a state in which a locking rod is inserted into the groove of a rock washer. FIG. 3 is the fastening state diagram of FIG. 1. FIG. 4 is a cross-sectional view of the fastening state of a bolt and a lock washer according to an embodiment of the present invention. FIG. 5 is an exemplary perspective view according to an embodiment using two lock washers. FIG. 6 is the fastening state diagram of FIG. 5 Specific details for implementing the invention

[0016] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings, focusing on the parts necessary to understand the operation and function according to the present invention.

[0017] The embodiments described in this specification and the configurations illustrated in the drawings are merely one preferred embodiment of the present invention and do not represent all of the technical concepts of the present invention; therefore, it should be understood that various modifications capable of replacing them may exist at the time of filing this application.

[0018] In describing the embodiments of the present invention, unnecessary technical details that are well known in the technical field to which the present invention belongs and are not directly related to the present invention are omitted to ensure clearer communication without obscuring the essence of the invention.

[0019] Referring to FIGS. 1 to 4, an anti-loosening bolt assembly according to one embodiment of the present invention comprises a bolt (100) and a lock washer (200) that is inserted into the bolt (100) and coupled between a fastening target (M) to prevent loosening.

[0020] The above bolt (100) is composed of a bolt head (110) that is rotated by pressure by an external force and a shaft (120) that extends below the bolt head (110) and has screw threads (121) formed on its outer surface.

[0021] Additionally, the bolt head (110) is formed with a cross-section in the shape of a polygon, such as a hexagon, so that it can be tightened with a tool such as a wrench, and the bottom surface is formed with a cam pattern (220) having an inclined surface (221) and a stepped surface (222), and a locking rod (300) is provided on one side that extends downward and protrudes.

[0022] The above-mentioned lock washer (200) is formed in the shape of a disc that penetrates a hole (201) into which the shaft (120) of the bolt (100) can be inserted, and on the upper surface that is in contact with the cam pattern (220) on the bottom surface of the bolt head (110), a cam pattern (220) is formed having a radial inclined surface (221) and a stepped surface (222) extending from the hole (201) toward the outer surface, and on the lower surface that is in contact with the fastening target (M), a tooth pattern (210) consisting of radial teeth extending from the hole (201) toward the outer surface is formed, and a groove (400) is provided in which the locking rod (300) of the bolt head (110) is fitted outward from the hole (201).

[0023] One or more of the locking rod (300) of the bolt head (110) and the groove (400) of the lock washer (200) may be provided.

[0024] In an anti-loosening bolt assembly according to one embodiment of the present invention, when a lock washer (200) is fitted onto the shaft (120) of a bolt (100) and placed on a fastening target (M), a locking rod (300) protruding from the bottom surface of a bolt head (110) is fitted into a groove (400) of a lock washer (200), and when the bolt (100) is fastened to the fastening target (M), the cam pattern (220) of the bolt head (110) and the cam pattern (220) of the lock washer (200) come into precise contact and are coupled. When the bolt (100) is rotated during the fastening process, the lock washer (200) also rotates together with the bolt (100) due to the engagement between the locking rod (300) and the groove (400). When the bolt (100) is fastened with strong pressure while in close contact with the lock washer (200) on the fastening target (M), The tooth pattern (210) on the lower surface that is in close contact with the fastening target (M) is strongly fixed by digging into the fastening target (M), and the cam pattern (210) of the lock washer (200) that is in close contact with the cam pattern (220) of the bolt head (110) is strongly compressed in the tightening direction on the lower surface of the bolt head (110) by strong pressure during fastening, thereby maintaining a stable connection state that does not loosen in the opposite direction.

[0025] To elaborate, in the conventional coupling structure of a bolt (100) and a lock washer (200), the lock washer (200) does not rotate simultaneously when the bolt (100) is fastened. Therefore, the cam pattern (220) on the bottom surface of the bolt head (110) and the cam pattern (220) on the top surface of the lock washer (200) do not engage at a certain position when the bolt (100) is fastened. As friction occurs continuously during the rotation process, the inclined surfaces of the bolt head (110) and the lock washer (200) are worn down. Consequently, the coupling force between the bolt head (110) and the cam pattern (210) of the lock washer is weak, the fastening force is not firm, and there is a problem that it gradually loosens due to vibration and impact.

[0026] In contrast, the present invention has the characteristic that when the bolt head (110) and the lock washer (200) are fastened by the combination of the locking rod (300) and the groove (400), they rotate simultaneously and do not rub against each other, thereby preventing wear on the inclined surface (221) and the stepped surface (222) of the cam pattern (220), and the fastening force is strong and the anti-loosening effect is increased.

[0027] FIGS. 5 and 6 illustrate an embodiment using two lock washers (200). When the cam pattern of the first lock washer (200-1) and the cam pattern of another second lock washer (200-2) are in close contact and inserted into the shaft of the bolt, the tooth pattern (210) of the first lock washer is pressed against the cam pattern (220) formed on the bottom surface of the bolt head (110), and the tooth pattern (210) of the second lock washer is pressed against the fastening target (M), and the cam patterns (220) of the joint surface are interlocked and coupled with each other to prevent the bolt (100) from loosening, as is known.

[0028] In the present invention, when using two such lock washers (200), if a groove (400) into which the locking rod (300) of the bolt head (110) is inserted is formed in the first lock washer (200-1), the first lock washer (200-1) rotates integrally with the bolt head (110) when fastened through the engagement of the locking rod (300) and the groove (400), and the internal cam pattern (220) engaged with the second lock washer (200-2) rotates while the inclined surface (221) and the stepped surface (222) engage with each other, thereby strongly pressing the second lock washer (200-2) against the fastening target (M). Thus, when fastening the bolt (100), the tooth pattern (210) and the cam pattern (220) are fastened without causing wear, thereby maintaining a solid connection state and preventing the phenomenon of loosening due to vibration and impact.

[0029] Although preferred embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above but is defined by the claims, and it is obvious that various modifications and improvements can be made in the technical field to which the present invention belongs. Explanation of the symbols

[0030] 100 : Bolt 110: Bolt head 120: Shaft 121 : Thread M : Attachment target 200 : Lock washer 201 : Hole 210 : Tooth pattern 220 : Cam pattern 221 : Horizontal surface 222 : Step surface 300 : Stopper rod 400 : Groove 200-1 : 1st lock washer 200-2 : 2nd lock washer

Claims

Claim 1 A bolt (100) comprising a bolt head (110) having a cam pattern (220) formed on its bottom surface, and a shaft (120) extending downward from the bolt head (110) and having screw threads (121) formed on its outer surface; The anti-loosening bolt assembly comprises: a bolt head (110) and a lock washer (200) disposed between the bolt head (110) and a fastening target (M); wherein the lock washer (200) comprises a cam pattern (220) formed on an upper surface, a tooth pattern (210) formed on a lower surface and pressed into the fastening target (M), and a through hole (201) formed in the center; wherein a locking rod (300) protruding downward is formed on one side of the cam pattern (220) on the lower surface of the bolt head (110), and a groove (400) extending outward is formed in the through hole (201) of the lock washer (200) so that the locking rod (300) is inserted and coupled into the groove (400), and when the bolt is fastened, the cam pattern of the bolt head (110) and the cam pattern (220) of the lock washer (200) come into contact with each other in a corresponding manner. A bolt assembly that prevents loosening, characterized in that the lock washer (200) is pressed axially so that the tooth pattern (210) is pressed into the fastening target (M), and when the bolt is rotated in reverse, the rotation of the lock washer (200) is suppressed by the coupling of the locking rod (300) and the groove (400). Claim 2 delete Claim 3 delete

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