Anti-loosening screw

Abstract

The present invention relates to an anti-loosening screw to which two types of nuts having different screw directions are both fastened, and of which a first screw portion and a second screw portion, to which the respective nuts are fastened, have different pitches and lead angles, thereby enabling the prevention of a loosening phenomenon of the screw from occurring even as a result of impact or vibration, and thus enabling the prevention of a safety accident from occurring. The screw is provided with a head portion (15) and a screw portion (11). The screw portion (11) comprises: a first screw portion (12) having a first lead angle (θ1) and a first pitch (P1); and a second screw portion (13) having a second lead angle (θ2) inclined in the opposite direction from the first lead angle (θ1), and having a second pitch (P2) greater than the first pitch (P1) by the formation of a root in a screw thread portion of the first screw portion (12).

Description

self-locking screw

[0001] The present invention relates to an anti-loosening screw, and more specifically, to an anti-loosening screw in which two types of nuts having different screw directions are both fastened, and the pitch and lead angle of a first screw portion and a second screw portion to which each nut is fastened are different, thereby preventing the screw from loosening even due to impact or vibration, thereby preventing the occurrence of safety accidents.

[0002] Screws and nuts are widely used as fasteners in various industries and even in everyday life. Therefore, in fastening structures utilizing screws and nuts, the reliability of the screw connection is paramount.

[0003] However, screws may loosen over time due to various factors such as shock and vibration caused by strong winds and earthquakes, temperature changes, and climate conditions.

[0004] For example, in structures exposed to wind and continuous vibration, such as solar power plants, steel towers, and bridges, screw loosening is highly likely to occur. This can directly lead to safety accidents and cause significant damage and loss. In particular, solar modules installed on the roofs of tall buildings have a large surface area, making them highly vulnerable to strong winds and earthquakes. Furthermore, the constant vibration increases the risk of screw loosening, which can lead to extremely dangerous, large-scale safety accidents.

[0005] The scale of damage from these accidents is so enormous that it is impossible to estimate, including enormous economic losses, casualties, and secondary damage.

[0006] Accordingly, various anti-loosening structures are being developed to prevent screw loosening, but most of them have complex structures, making processing difficult and increasing manufacturing costs.

[0007] Meanwhile, as a result of searching for prior art related to the present invention, a number of patent documents were retrieved, some of which are introduced as follows.

[0008] Patent Document 1 includes a screw that is inserted through a first object and a second object and has a first screw thread formed on an outer periphery; a nut that is fastened to a lower portion of the screw to fix the screw and the first object and the second object; a loosening prevention lock that is fastened to a lower portion of the screw that protrudes below the nut to prevent the screw from rotating in a loosening direction; and a stopper that is coupled to an inner lower portion of the loosening prevention lock and supports the screw so that only one direction of rotation is possible, wherein the loosening prevention lock has a housing in which a screw insertion hole into which the screw is inserted is formed over the entire height and is formed in a color that is distinct from the screw;A spring coil member is included that is accommodated inside the housing and is wound and spread along the first screw thread of the screw when the screw is rotated and inserted into the housing, the lower end of the spring coil member is fixed to the inner wall surface of the housing and the upper end of the spring coil member is positioned in a free state, the spring coil member is wound and spread along the first screw thread of the screw when the screw is inserted, and when the screw is rotated in the loosening direction, tension is applied to the outer periphery of the screw to prevent rotation of the screw, a housing fixing extension end that extends radially outward is provided at the lower end of the spring coil member, a spring fixing groove into which the housing fixing extension end is inserted and fixed is formed on the lower inner wall surface of the housing, an extension support wall that protrudes horizontally from the inner wall surface on one side of the lower inner wall surface of the housing to contact and support the lower end of the housing fixing extension end, and an extension support wall that protrudes obliquely on the other side of the extension support wall to A spring release prevention wedge is provided to prevent external separation of a spring coil member, and the stopper is provided in the form of a disk that is forcibly fitted into the inner wall surface of the housing, and an insertion hole into which the screw is inserted is formed through, and a plurality of catches are formed to protrude radially inwardly along the circumference around the insertion hole, and a screw loosening prevention lock is disclosed that prevents loosening of the screw even when strong vibration or external force such as strong wind or earthquake is applied, thereby stably maintaining the state of binding with the fastened object.

[0009] Patent Document 2 discloses a screw fastening device including a flat plate-shaped base plate having a through hole formed therein; a cam portion having a side wall surface formed by protruding from a first surface among both surfaces of the base plate portion and facing the through hole, and a cam surface extending radially outward from an upper end of the side wall surface with respect to the center of the through hole and being inclined so as to have a lower height from the first surface as it goes along a first circumferential direction; and a locking portion formed by protruding from a second surface opposite the first surface among both surfaces of the base plate portion, wherein rotation of the washer in the loosening direction is prevented, and the screw fastener is prevented from rotating in the loosening direction by interaction between the cam surface formed on the screw fastener and the washer, thereby preventing loosening of the screw fastener.

[0010] Patent Document 3 discloses a screw joint assembly having a loosening prevention function, which includes a first member having a screw portion, a second member having a female screw portion formed in the center for screw-connecting with the male screw portion of the first member and a first bevel ring gear formed on a loosening side surface, at least one bevel pinion gear gear-connected to the first bevel ring gear of the second member, and a third member having a through hole formed in the center for inserting the male screw portion of the first member and a second bevel ring gear gear-connected to the bevel pinion gear formed on a locking side surface, thereby ensuring stable connection of a screw joint such as a bolt and nut joint and fundamentally preventing loosening by resisting external forces of various shapes and sizes, thereby ensuring the reliability of the screw joint.

[0011] Patent Document 4 discloses a loosening prevention screw having multiple threads formed, which comprises a loosening prevention bolt having two threads formed simultaneously and a single thread; a nut having two threads formed on the bolt and a nut having a single thread formed, wherein the two nuts are fastened in the same direction, enabling quick and intuitive fastening; and a reinforced structure that can withstand not only loosening due to rotation but also complex external forces such as vibration and shock in the axial direction.

[0012] [Patent Document]

[0013] (Patent Document 1) KR 10-2323654 B1

[0014] (Patent Document 2) KR 10-2021-0047116 A

[0015] (Patent Document 3) KR 10-2023-0115963 A

[0016] (Patent Document 4) KR 20-0326819 Y1

[0017] Accordingly, the present invention has been devised to solve the problems of the above-mentioned prior art, and the purpose of the present invention is to provide a loosening prevention screw in which two types of nuts with different screw directions are both fastened, and the pitch and lead angle of the first screw portion and the second screw portion to which each nut is fastened are different, thereby preventing the screw from loosening even due to impact or vibration, thereby preventing the occurrence of safety accidents.

[0018] In order to achieve the above object, the anti-loosening screw of the present invention is characterized in that the screw has a head portion and a screw portion, wherein the screw portion (11) comprises a first screw portion having a first lead angle and a first pitch, and a second screw portion having a second lead angle inclined in a direction opposite to the first lead angle and having a second pitch larger than the first pitch, and a groove is formed in the thread portion of the first screw portion.

[0019] In addition, according to the anti-loosening screw of the present invention, the nominal diameter of the second screw portion is larger than the nominal diameter of the first screw portion, and the angular diameter of the second screw portion is the same as the effective diameter of the first screw portion.

[0020] In addition, according to the anti-loosening screw of the present invention, the first pitch of the first screw portion is 1.75 mm, and the second pitch of the second screw portion is 2.0 mm.

[0021] In addition, according to the anti-loosening screw of the present invention, the first screw portion is a left-hand screw, and the second screw portion is a right-hand screw.

[0022] In addition, according to the anti-loosening screw of the present invention, the head portion is characterized in that the washer is formed integrally.

[0023] Since the anti-loosening screw of the present invention has a second lead angle of the second screw portion formed to be inclined in the opposite direction to the first lead angle and a second pitch larger than the first pitch, by fastening the first nut to the first screw portion and then fastening the second nut to the second screw portion in the opposite direction to firmly tighten the first nut, it is possible to prevent the first nut from loosening.

[0024] That is, since there is friction between the first nut and the second nut, when the first nut tries to loosen, the second nut also tries to rotate in the same direction as the first nut is loosening, but since the direction in which the first nut is loosened is the direction in which the second nut is fastened, the first nut can be prevented from loosening.

[0025] In addition, according to the present invention, since the nominal diameter of the second screw portion is larger than the nominal diameter of the first screw portion, the first screw portion can be formed first and then the second screw portion can be processed, and since the concave diameter of the second screw portion and the effective diameter of the first screw portion are the same, there is an effect of being able to visually confirm whether the groove portion of the second screw portion formed in the first screw portion is accurately formed.

[0026] In addition, according to the present invention, since the washer is formed integrally in the head portion, the contact surface with the member to be fastened is increased, thereby improving the fastening force and minimizing damage to the member to be fastened.

[0027] Figure 1 is a schematic diagram showing a loosening prevention screw according to the present invention.

[0028] Figure 2 is a drawing showing the anti-loosening screw according to the present invention viewed from various directions.

[0029] Figure 3 is a drawing showing the screw portion of the anti-loosening screw according to the present invention.

[0030] Figure 4 is a drawing for explaining a fastening structure using an anti-loosening screw according to the present invention.

[0031] Hereinafter, the anti-loosening screw of the present invention will be described with reference to the attached drawings.

[0032] The terms used in the present invention are terms defined in consideration of their functions in the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, the definitions of these terms should be interpreted as meanings and concepts that are consistent with the technical aspects of the present invention.

[0033] In addition, the embodiments of the present invention do not limit the scope of the present invention, but are merely exemplary matters of the components presented in the claims of the present invention, and are embodiments that include components that are included in the technical idea throughout the specification of the present invention and can be replaced as equivalents in the components of the claims.

[0034] Additionally, the optional terms in the examples below are used to distinguish one component from another, and the components are not limited by the terms.

[0035] Accordingly, in describing the present invention, detailed descriptions of related known technologies that may unnecessarily obscure the gist of the present invention are omitted.

[0036] To explain a preferred embodiment of the present invention, FIG. 1 is a schematic diagram showing an anti-loosening screw according to the present invention, FIG. 2 is a diagram showing the anti-loosening screw according to the present invention as viewed from various directions, FIG. 3 is a diagram showing a threaded portion of an anti-loosening screw according to the present invention, and FIG. 4 is a diagram for explaining a fastening structure using an anti-loosening screw according to the present invention.

[0037] As shown in FIGS. 1 to 3, the loosening screw according to the present invention has a head portion (15) and a screw portion (11), and the screw portion (11) is composed of a first screw portion (12) having a first lead angle (θ1) and a first pitch (P1), and a second screw portion (13) having a second lead angle (θ2) and a second pitch (P2).

[0038] At this time, the second screw portion (13) has a structure in which the second lead angle (θ2) is inclined in the opposite direction to the first lead angle (θ1), and the second pitch (P2) is formed with a groove in the screw thread portion of the first screw portion (12) so that it is larger than the first pitch (P1).

[0039] For example, if the first pitch of the first screw portion (12) is 1.75 mm, the second pitch of the second screw portion (13) is set to 2.0 mm.

[0040] And it is preferable that the nominal diameter of the second screw portion (13) is larger than the nominal diameter of the first screw portion (12), and that the curvature of the second screw portion (13) is the same as the effective diameter of the first screw portion (12).

[0041] That is, when the first screw portion (12) is formed to an M20 standard, the second screw portion (13) has an M24 standard, so that the nut fastened to the second screw portion (13) can come out after completely passing through the screw portion (11).

[0042] At this time, the first screw portion (12) may be formed as a left-hand screw, and the second screw portion (13) may be formed as a right-hand screw.

[0043] Of course, it is acceptable for the first screw portion (12) to be formed as a right-hand screw and the second screw portion (13) to be formed as a left-hand screw.

[0044] And, it is preferable to use the head part (15) formed integrally with a washer (16) to improve adhesion.

[0045] The anti-loosening screw of the present invention configured as described above is configured such that both a left-hand thread nut and a right-hand thread nut are fastened to prevent the screw from loosening due to vibration or impact.

[0046] When inserting the anti-loosening screw (10) so as to penetrate the fastening object (50)(50') and fastening the nut to the screw portion (11) protruding outwardly of one fastening object (50), the left-hand threaded nut (20) fastened to the first screw portion (12) is fastened first, and then the right-hand threaded nut (30) fastened to the second screw portion (13) is fastened until it is in close contact with the left-hand threaded nut (20).

[0047] Accordingly, when the left-hand screw nut (20) is about to loosen due to external impact, etc., the right-hand screw nut (30) that is in close contact with the left-hand screw nut (20) also rotates in the same direction as the left-hand screw nut (20) due to friction and tries to be fastened, thereby preventing the left-hand screw nut (20) from loosening.

[0048] However, when fastening a nut to the screw portion (11) of the anti-loosening screw (10), if the right-hand thread nut (30) is fastened first, the nominal diameter of the second screw portion (13) is larger than the nominal diameter of the first screw portion (12), so the right-hand thread nut (30) completely passes through the screw portion (11) and then comes off.

[0049] Therefore, it becomes impossible to prevent loosening by first fastening the right-hand threaded nut (30) to the anti-loosening screw (10) and then fastening the left-hand threaded nut (20) so that it is tightly attached to the right-hand threaded nut (30).

[0050] While the present invention has been described and illustrated with reference to several embodiments to illustrate the technical concept of the present invention, it is to be understood by those skilled in the art that the present invention is not limited to the configuration and operation described above, and that numerous changes and modifications to the present invention are possible without departing from the scope of the technical concept described in the description of the invention. Accordingly, all such appropriate changes and modifications and equivalents should be considered to fall within the scope of the present invention.

[0051] [Explanation of symbols]

[0052] 10..Anti-loosening screw

[0053] 11... Screw

[0054] 12...1st screw section

[0055] 13...Second Screw Division

[0056] 15...head

[0057] 16...washer

[0058] 20...left-hand thread nut

[0059] 30...right-hand thread nut

[0060] 50, 50'...object of contract

[0061] P1...1st pitch

[0062] P2...2nd pitch

[0063] θ1...first lead angle

[0064] θ2...second lead angle

Claims

1. In a screw having a head portion (15) and a screw portion (11), The above screw portion (11) has a first screw portion (12) having a first lead angle (θ1) and a first pitch (P1), An anti-loosening screw characterized in that it comprises a second screw portion (13) having a second lead angle (θ2) inclined in the opposite direction to the first lead angle (θ1) and a second pitch (P2) larger than the first pitch (P1) and formed with a groove in the screw thread portion of the first screw portion (12).

2. In the clause, The nominal diameter of the second screw portion (13) is larger than that of the first screw portion (12), An anti-loosening screw characterized in that the diameter of the second screw portion (13) is the same as the effective diameter of the first screw portion (12).

3. In paragraph 1, The first pitch of the above first screw portion (12) is 1.75 mm, An anti-loosening screw characterized in that the second pitch of the second screw portion (13) is 2.0 mm.

4. In paragraph 1, The above first screw portion (12) is formed as a left-hand screw, An anti-loosening screw characterized in that the second screw portion (13) is formed as a right-hand screw.

5. In paragraph 1, An anti-loosening screw characterized in that the head portion (15) is formed integrally with a washer (16).

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