Anti-loosening nut

Abstract

The disclosure relates to an anti-loosening nut wherein same can be quickly and easily fastened and fixed to an end side of a bolt that penetrates an object to be fastened in a state in which a nut part and a washer part are pre-coupled, and when fastened to a bolt, the elastic grip of the washer part is pressed against the outer circumferential surface of the bolt such that, despite impacts or vibrations applied from the outside, inadvertent loosening can be reliably prevented. The disclosure relates to an anti-loosening nut which is screw-coupled to an end side of a bolt that penetrates an object to be fastened. An embodiment of the disclosure provides an anti-loosening nut comprising: a nut unit having a female screw hole formed through one side thereof to be screw-coupled to an end side of the bolt, having a grip insertion groove formed on the other side thereof to communicate with the female screw hole, and having an engaging ledge formed on the inner wall of the grip insertion groove to be recessed; and a washer unit having a through-hole formed through the center thereof to be fitted to the end side of the bolt, having a plurality of elastic grips formed to protrude from the circumference of the through-hole such that same can be inserted into the grip insertion groove of the nut unit and is divided by a division slit, and having an engaging protrusion formed to protrude from the outer circumferential surface of at least two of the plurality of elastic grips to be detachably coupled to the engaging ledge.

Description

anti-loosening nut

[0001] The disclosed content relates to a loosening prevention nut that is screwed onto the end side of a bolt that penetrates a fastening object to prevent loosening due to shock, vibration, etc.

[0002] Unless otherwise indicated herein, the materials described in this section are not prior art to the claims of this application, and their inclusion in this section is not intended to be admitted as prior art.

[0003]

[0004] In general, bolts and nuts are widely used as fastening members for integrally fastening and fixing objects such as various machine devices or structural parts.

[0005] These bolt-and-nut fasteners are formed by screwing a nut into the end of a bolt that has passed through the object to be fastened. This type of bolt-and-nut fastening structure has a problem in that the fastening strength decreases as the nut loosens due to external shock and vibration over time. To prevent this decrease in bolt-and-nut fastening strength, a washer is first inserted into the end of the bolt before the nut is fastened, interposing it between the object to be fastened and the nut.

[0006] As an example of a loosening prevention nut including such a washer, Republic of Korea Utility Model Registration No. 20-0297160 (announced on December 11, 2002) discloses a loosening prevention nut and washer characterized by including a washer having an inclined surface formed along the inner surface, and a nut having a compression portion that, when an external force is applied, contacts one side of the washer with the inclined surface to compress the washer.

[0007] In addition, Korean Patent Publication No. 10-2001-0015543 (published on February 26, 2001) discloses a nut loosening prevention structure in which at least one seating surface of the upper and lower surfaces of a ring-shaped washer body having a bolt insertion hole penetrating the center of the shaft is formed into a gently inclined surface obliquely in one direction, the washer is placed on the lower surface of a nut, the nut is screwed onto the bolt, and the washer is fastened to a fastened member with a predetermined torque, thereby bringing the lower surface of the nut into close contact with the upper surface of the washer and simultaneously pressing the inclined seating surface of the washer against the upper surface of the fastened member, thereby simultaneously generating pressure toward the bolt shaft and surface pressure against the fastened member, thereby preventing loosening of the nut.

[0008] In addition, Korean Patent Publication No. 10-2022-0078213 (published on June 10, 2022) discloses a loosening prevention nut structure characterized by including a washer member having a first through hole formed in the center to allow a bolt to pass through and a connecting portion formed to protrude upwards and surround the first through hole through eccentric processing and tapered processing, and a nut member having a second through hole formed in the center to allow a bolt to pass through and tapered so that the lower part of the inner circumferential surface engages with the connecting portion of the washer member during a screw-in process with the bolt.

[0009] However, in the case of conventional anti-loosening nuts including washers, since the washers are formed separately from the nut, a worker wearing work gloves must first insert the washer into the end of the bolt that penetrates the fastening object while carrying the nut and washer separately, and then screw the nut in. Therefore, the fastening and fixing work of the anti-loosening nut is very cumbersome and time-consuming.

[0010] The present invention provides a loosening prevention nut that can be quickly and easily fastened to the end side of a bolt that has penetrated a fastening object in a state in which a nut portion and a washer portion or a nut portion and an elastic gripping portion are pre-assembled.

[0011] The present invention provides a loosening prevention nut that can reliably prevent arbitrary loosening even when subjected to external shock or vibration by having the elastic grip of the washer portion or the elastic grip of the elastic grip ring portion press against the outer surface of the bolt when fastened to the bolt.

[0012] In addition, it is obvious that the technical tasks are not limited to the technical tasks described above, and other technical tasks may be derived from the following description.

[0013] The disclosed content is a loosening prevention nut that is screwed into the end side of a bolt that penetrates a fastening object, characterized in that it includes a nut part having a female screw hole formed through the end side of the bolt on one side thereof, a grip insertion groove formed in communication with the female screw hole on the other side thereof, and a catch projection formed into the inner wall of the grip insertion groove; and a washer part having a through hole formed through the center thereof to be fitted into the end side of the bolt, a plurality of elastic grips that can be inserted into the grip insertion groove of the nut part and are divided by a split slit and are formed protruding around the through hole, and a catch projection that is detachably coupled to the catch projection is formed protruding on the outer surface of at least two of the plurality of elastic grips.

[0014] According to a preferred feature of the disclosed content, the grip insertion groove is formed such that the inner diameter becomes narrower as it goes toward the female screw hole, so that when the nut portion is fastened to the bolt, the plurality of elastic grips can be pressed and pressed against the outer surface of the bolt.

[0015] According to a preferred feature of the disclosed content, the washer part can be made of a metal material or a synthetic resin material.

[0016] According to a preferred feature of the disclosed content, the washer part may include a washer body having a first hole formed in the center and a ring-shaped coupling step formed around the first hole, and an elastic grip ring that is coupled to the ring-shaped coupling step of the washer body and has a second hole formed through the center and a plurality of elastic grips protruding around the inner circumference.

[0017] According to a preferred feature of the disclosed content, anti-rotation grooves are formed at regular angular intervals on the inner circumference of the ring-shaped coupling step of the washer body, and an anti-rotation protrusion that is inserted and coupled to correspond to the anti-rotation grooves can be formed protrudingly on the elastic grip ring.

[0018] According to a preferred feature of the disclosed content, the washer body may be made of a metal material and the elastic grip ring may be made of a synthetic resin material.

[0019] According to a preferred feature of the disclosed content, the nut portion and the washer portion can be screw-connected to the end side of the bolt penetrating the fastening object in a pre-connected state such that the hooking projections of the plurality of elastic grips are connected to the hooking projections of the grip insertion groove.

[0020] In addition, the disclosed content is a loosening prevention nut that is screwed into the end side of a bolt that penetrates a fastening object, characterized in that it includes a nut portion having a female screw hole formed through the nut portion on one side to be screwed into the end side of the bolt and a grip insertion groove formed on the other side to be connected to the female screw hole; and a washer portion having a through hole formed through the center to be fitted into the end side of the bolt and having a plurality of elastic grips protruding around the through hole and formed into a plurality of split slits that can be inserted into the grip insertion groove of the nut portion.

[0021] According to a preferred feature of the disclosed content, the grip insertion groove is formed such that the inner diameter becomes narrower as it goes toward the female screw hole, so that when the nut portion is fastened to the bolt, the plurality of elastic grips can be pressed and pressed against the outer surface of the bolt.

[0022] According to a preferred feature of the disclosed content, the nut portion and the washer portion can be screwed onto the end side of the bolt penetrating the fastening object in a pre-assembled state so that the plurality of elastic grips are inserted into the grip insertion groove.

[0023] In addition, the disclosed content is a loosening prevention nut that is screwed into the end side of a bolt that penetrates a fastening object, characterized in that it includes a nut portion having a female screw hole formed through one side to be screwed into the end side of the bolt and a grip ring insertion groove formed on the other side to be in communication with the female screw hole; and an elastic grip ring portion having a hole formed through the center of the nut portion that can be inserted into the grip ring insertion groove and that is fitted into the end side of the bolt, and a plurality of elastic grips formed protruding by split slits around the hole.

[0024] According to a preferred feature of the disclosed content, the grip insertion groove is formed such that the inner diameter becomes narrower as it goes toward the female screw hole, so that when the nut portion is fastened to the bolt, the plurality of elastic grips can be pressed and pressed against the outer surface of the bolt.

[0025] According to a preferred feature of the disclosed content, the nut portion and the elastic grip ring portion can be screw-connected to the end side of the bolt penetrating the fastening object in a pre-connected state so that the plurality of elastic grips are inserted into the grip insertion groove.

[0026] According to the anti-loosening nut according to the embodiment of the disclosed content, there is an advantage in that the nut portion and the washer portion, or the nut portion and the elastic gripping portion, can be quickly and easily fastened and fixed to the end side of a bolt penetrating a fastening object in a pre-assembled state.

[0027] According to an anti-loosening nut according to one embodiment of the disclosed content, the grip insertion groove or grip ring insertion groove formed in the nut portion is formed such that the inner diameter becomes narrower as it goes toward the female screw hole, so that when the nut portion is fastened to the bolt, a plurality of elastic grips are pressed against the outer surface of the bolt, thereby having the advantage of being able to reliably prevent arbitrary loosening even under external shock or vibration.

[0028] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0029] Figure 1 is a diagram showing the state of use of an anti-loosening nut according to one embodiment of the disclosed content.

[0030] FIG. 2 is a perspective view of an anti-loosening nut according to one embodiment of the disclosed subject matter.

[0031] FIG. 3 is an exploded perspective view of an anti-loosening nut according to one embodiment of the disclosed subject matter.

[0032] Figure 4 is a cross-sectional view of a use state of an anti-loosening nut according to one embodiment of the disclosed content.

[0033] FIG. 5 is an exploded perspective view of another embodiment of a washer portion of an anti-loosening nut according to one embodiment of the disclosed content.

[0034] FIG. 6 is a diagram showing the anti-loosening operation of an anti-loosening nut according to one embodiment of the disclosed content.

[0035] FIG. 7 is an exploded perspective view of an anti-loosening nut according to another embodiment of the disclosed subject matter.

[0036] FIG. 8 is a diagram showing the anti-loosening operation of an anti-loosening nut according to another embodiment of the disclosed content.

[0037] FIG. 9 is an exploded perspective view of an anti-loosening nut according to another embodiment of the disclosed subject matter.

[0038] FIG. 10 is a diagram showing the anti-loosening operation of an anti-loosening nut according to another embodiment of the disclosed subject matter.

[0039] Hereinafter, the configuration and operational effects of a preferred embodiment will be described with reference to the attached drawings. Note that in the drawings below, each component is omitted or schematically illustrated for convenience and clarity, and the size of each component does not reflect its actual size. Furthermore, throughout the specification, the same reference numerals designate the same components, and drawing numbers for identical components are omitted in individual drawings.

[0040]

[0041] According to one embodiment of the disclosed content, a loosening prevention nut (1) is screw-connected to the end side of a bolt (3) that penetrates a fastening object (2) as shown in FIG. 1 to prevent loosening due to impact, vibration, etc., and as shown in FIGS. 2 to 4, a plurality of elastic grips (23) formed on a washer portion (20) are inserted into a grip insertion groove (12) of a nut portion (10), and a plurality of hooking projections (24) of an elastic grip (23) are engaged with a hooking protrusion (13) of the grip insertion groove (12), so that the nut portion (10) and the washer portion (20), which are formed separately from each other, are fastened and fixed to the end side of a bolt (3) that penetrates a fastening object (2) in a pre-connected state.

[0042] Here, the nut portion (10) corresponds to the body of the anti-loosening nut (1) according to one embodiment of the disclosed content, and serves to integrally fasten the fastening object (2) by being screwed onto the end side of the bolt (3) that penetrates the fastening object (2).

[0043] A female screw hole (11) is formed through one side of the nut portion (10) to be screw-connected to the end side of the bolt (3). The female screw hole (11) has an inner diameter corresponding to the outer diameter of the bolt (3) so that the bolt (3) can be inserted through screw connection.

[0044] In addition, a grip insertion groove (12) is formed on the other side of the nut portion (10) to be connected to the female screw hole (11). The grip insertion groove (12) corresponds to a type of joining groove into which a plurality of elastic grips (23) of the washer portion (20) to be described later are detachably inserted and joined.

[0045] It is preferable that the grip insertion groove (12) be formed so that the inner diameter becomes narrower as it goes toward the female screw hole (11). In this case, when fastening the nut portion (10) to the bolt (3), as the fastening progresses, the plurality of elastic grips (23) of the washer portion (20) to be described later are pressed radially inward, and when the fastening of the nut portion (10) to the bolt (3) is completed, the outer surface of the bolt (3) is pressed and closely contacted, thereby preventing arbitrary loosening of the nut portion (10) to the bolt (3).

[0046] In addition, a catch (13) is formed into the inner wall of the grip insertion groove (12). The catch (13) corresponds to a portion where the catch projections (24) of a plurality of elastic grips (23), which will be described later, are detachably connected by the elasticity of the elastic grips (23). It is preferable that the catch projections (13) be formed into the inner wall of the grip insertion groove (12) in the form of a kind of ring groove so that the catch projections (24) can be caught simply by inserting a plurality of elastic grips (23) into the grip insertion groove (12), regardless of the position or insertion direction of the catch projections (24) of the plurality of elastic grips (23).

[0047] Between the aforementioned nut portion (10) and the fastening object (2), a washer portion (20) is interposed while penetrating through the bolt (3).

[0048] The washer part (20) is interposed between the aforementioned nut part (10) and the fastening object (2), and serves to prevent the nut part (10) from being loosened arbitrarily and the fastening force from being reduced due to external shock or vibration applied after fastening of the nut part (10).

[0049] A through hole (21) that fits into the end side of the bolt (3) is formed through the center of this washer portion (20). This through hole (21) has a diameter larger than the outer diameter of the bolt (3) so that the bolt (3) can pass through it.

[0050] In addition, an elastic grip (23) is formed protrudingly around the circumference of the hole (21) by being divided into a plurality of pieces by means of a split slit (22). The elastic grip (23) is inserted into the grip insertion groove (12) of the nut portion (10) to enable pre-engagement of the washer portion (20) to the nut portion (10), and when the nut portion (10) is screwed onto the end side of the bolt (3) that has penetrated the fastening object (2), the outer surface of the bolt (3) on which the threads are formed is pressed against the outer surface, thereby preventing the loosening prevention nut (1) according to one embodiment of the disclosed content from being arbitrarily loosened from the end side of the bolt (3). This elastic grip (23) is formed by being divided into a plurality of pieces by means of the split slit (22) and has its own elasticity in the radial direction.

[0051] In addition, at least two of the plurality of elastic grips (23) have protruding projections formed on the outer surfaces thereof, which are detachably coupled to the projections (13) formed on the inner walls of the grip insertion grooves (12) of the washer portion (20). At this time, it is preferable that the projections (24) are formed protruding one by one on each of the plurality of elastic grips (23), but in the minimum case, they may be formed on only two of the plurality of elastic grips (23) facing each other.

[0052] This washer part (20) may be manufactured as a single body using a metal material or synthetic resin material as shown in FIGS. 2 to 4, but depending on the embodiment, it may be formed by being separated into two parts as shown in FIG. 5.

[0053] In the latter case, the washer part (20) may include a washer body (20a) having a first hole (25) formed in the center and a ring-shaped coupling step (26) formed around the first hole (25), as shown in FIG. 5, and an elastic grip ring (20b) that is coupled to the ring-shaped coupling step (26) of the washer body (20a), has a second hole (28) formed through the center, and has a plurality of elastic grips (23) protruding around the inner circumference.

[0054] At this time, in order to prevent the elastic grip ring (20b) from rotating relative to the washer body (20a), it is preferable that anti-rotation grooves (27) are formed at regular angular intervals around the inner circumference of the ring-shaped coupling step (26) of the washer body (20a), and that anti-rotation protrusions (29) are formed protrudingly on the elastic grip ring (20b) to be inserted and coupled to correspond to the anti-rotation grooves (27).

[0055] In addition, the washer body (20a) and the elastic grip ring (20b) may both be made of metal, or both may be made of synthetic resin, but it is particularly preferable that the washer body (20a) be made of metal so that the elasticity of the elastic grip (23) can be increased, while the elastic grip ring (20b) be made of synthetic resin so that when the elastic grip (23) is pressed against the outer surface of the bolt (3), the threads formed on the outer surface of the bolt (3) can dig into the contact surface of the elastic grip (23), thereby increasing the loosening prevention performance.

[0056] Hereinafter, the operation of the anti-loosening nut (1) according to one embodiment of the disclosed content will be described with reference to FIGS. 1 to 6 as follows:

[0057] In the case of the anti-loosening nut (1) according to one embodiment of the disclosed content, a grip insertion groove (12) having a catch (13) formed therein is formed in communication with a female screw hole (11) in the nut portion (10), and a plurality of elastic grips (23) having catch projections (24) corresponding to the catch projections (13) protrude in the washer portion (20) so as to be insertable into the grip insertion groove (12), so that the nut portion (10) and the washer portion (20) can be quickly and easily fastened to the end side of the bolt (3) penetrating the fastening object (2) in a state where the catch projections (24) of the plurality of elastic grips (23) are coupled to the catch projections (13) of the grip insertion groove (12).

[0058] In addition, in the case of the anti-loosening nut (1) according to one embodiment of the disclosed content, since the grip insertion groove (12) formed in the nut portion (10) is formed to have an inner diameter that becomes narrower as it goes toward the female screw hole (11), when the nut portion (10) is fastened to the bolt (3), a plurality of elastic grips (23) are pressed against the outer surface of the bolt (3), especially the screw threads, so that arbitrary loosening can be reliably prevented even when there is an impact or vibration applied from the outside.

[0059]

[0060] According to another embodiment of the disclosed content, a loosening prevention nut (1') is screwed onto the end side of a bolt (3) penetrating a fastening object (2) as shown in FIGS. 7 and 8 to prevent loosening due to impact, vibration, etc., and has a structure in which a nut portion (10') and a washer portion (20') are pre-joined so that a plurality of elastic grips (23') formed on a washer portion (20') are inserted into a grip insertion groove (12') of a nut portion (10') and are fastened and fixed onto the end side of a bolt (3) penetrating a fastening object (2).

[0061] Here, the nut portion (10') corresponds to the body of the anti-loosening nut (1') according to another embodiment of the disclosed content, and serves to integrally fasten the fastening object (2) by being screwed onto the end side of the bolt (3) that penetrates the fastening object (2).

[0062] A female screw hole (11') is formed through one side of the nut portion (10') to be screw-connected to the end side of the bolt (3). The female screw hole (11') has an inner diameter corresponding to the outer diameter of the bolt (3) so that the bolt (3) can be inserted through screw connection.

[0063] In addition, a grip insertion groove (12') is formed on the other side of the nut portion (10') to be connected to the female screw hole (11'). The grip insertion groove (12') corresponds to a type of joining groove into which a plurality of elastic grips (23') of the washer portion (20') to be described later are detachably inserted and joined.

[0064] It is preferable that the grip insertion groove (12') be formed so that the inner diameter becomes narrower as it goes toward the female screw hole (11'). In this case, when fastening the nut portion (10') to the bolt (3), the elastic grips (23') of the washer portion (20') to be described later are pressed radially inward as the fastening progresses, and when the fastening of the nut portion (10') to the bolt (3) is completed, the outer surface of the bolt (3) is pressed and closely contacted, thereby preventing arbitrary loosening of the nut portion (10') to the bolt (3).

[0065] Between the aforementioned nut portion (10') and the fastening object (2), a washer portion (20') is interposed while penetrating through the bolt (3).

[0066] The washer part (20') is interposed between the aforementioned nut part (10') and the fastening object (2), and serves to prevent the nut part (10') from being loosened arbitrarily due to external impact or vibration applied after fastening of the nut part (10'), thereby reducing the fastening force.

[0067] A through hole (21') is formed in the center of this washer portion (20') to fit into the end side of the bolt (3). This through hole (21') has a diameter larger than the outer diameter of the bolt (3) so that the bolt (3) can pass through it.

[0068] In addition, an elastic grip (23') is formed protrudingly around the circumference of the hole (21') and is divided into a plurality of pieces by a split slit (22'). The elastic grip (23') is inserted into the grip insertion groove (12') of the nut portion (10') to enable pre-engagement of the washer portion (20') to the nut portion (10'), and when the nut portion (10') is screwed onto the end side of the bolt (3) that has penetrated the fastening object (2), the outer surface of the bolt (3) having a thread formed is press-fitted, thereby preventing the loosening prevention nut (1') according to another embodiment of the disclosed content from being arbitrarily loosened from the end side of the bolt (3). This elastic grip (23') is formed by being divided into a plurality of pieces by the split slit (22') and has its own elasticity in the radial direction.

[0069] This washer part (20') may be manufactured as a single body using metal or synthetic resin.

[0070] Hereinafter, the operation of the anti-loosening nut (1') according to another embodiment of the disclosed content will be described with reference to FIGS. 7 and 8 as follows:

[0071] In the case of the anti-loosening nut (1') according to another embodiment of the disclosed content, a grip insertion groove (12') is formed in the nut portion (10') to communicate with the female screw hole (11'), and a plurality of elastic grips (23') are formed protrudingly in the washer portion (20') so as to be insertable into the grip insertion groove (12'), so that the nut portion (10') and the washer portion (20') can be quickly and easily fastened and fixed to the end side of the bolt (3) that penetrates the fastening object (2) in a state in which the nut portion (10') and the washer portion (20') are pre-joined so that a plurality of elastic grips (23') can be inserted into the grip insertion groove (12').

[0072] In addition, in the case of the anti-loosening nut (1') according to another embodiment of the disclosed content, since the grip insertion groove (12') formed in the nut portion (10') is formed to have an inner diameter that becomes narrower as it goes toward the female screw hole (11'), when the nut portion (10') is fastened to the bolt (3), a plurality of elastic grips (23') are pressed against the outer surface of the bolt (3), especially the screw threads, so that arbitrary loosening can be reliably prevented even when there is an impact or vibration applied from the outside.

[0073]

[0074] According to another embodiment of the disclosed content, a loosening prevention nut (1") is screwed onto the end side of a bolt (3) that penetrates a fastening object (2) as shown in FIGS. 9 and 10 to prevent loosening due to shock, vibration, etc., and has a structure in which a plurality of elastic grips (23") formed on an elastic grip ring portion (20") are inserted into a grip ring insertion groove (12") of a nut portion (10") and the elastic grip ring portion (20") are pre-joined and fastened onto the end side of a bolt (3) that penetrates a fastening object (2).

[0075] Here, the nut portion (10") corresponds to the body of the anti-loosening nut (1") according to another embodiment of the disclosed content, and serves to integrally fasten the fastening object (2) by being screwed onto the end side of the bolt (3) that penetrates the fastening object (2).

[0076] A female screw hole (11") is formed through one side of the nut portion (10") to be screw-connected to the end side of the bolt (3). The female screw hole (11") has an inner diameter corresponding to the outer diameter of the bolt (3) so that the bolt (3) can be inserted through screw connection.

[0077] In addition, a grip ring insertion groove (12") is formed on the other side of the nut portion (10") to be connected to the female screw hole (11"). The grip ring insertion groove (12") corresponds to a type of joining groove into which a plurality of elastic grips (23") of the elastic grip ring portion (20"), which will be described later, are detachably inserted and joined.

[0078] It is preferable that the grip ring insertion groove (12") be formed so that the inner diameter becomes narrower as it goes toward the female screw hole (11"). In this case, when fastening the nut portion (10") to the bolt (3), the elastic grips (23") of the elastic grip ring portion (20"), which will be described later, are pressed radially inward as the fastening progresses, and when the fastening of the nut portion (10") to the bolt (3) is completed, the outer surface of the bolt (3) is pressed and tightly pressed, thereby preventing arbitrary loosening of the nut portion (10") to the bolt (3).

[0079] An elastic grip ring part (20") can be inserted into the grip ring insertion groove (12") of the aforementioned nut part (10").

[0080] The elastic grip ring part (20") is inserted in advance into the grip ring insertion groove (12") of the aforementioned nut part (10"), and when the nut part (10") is fastened to the fastening object (2), the elastic grip (23") is gradually tightened radially inward and comes into close contact with the outer surface of the bolt (3), thereby preventing the nut part (10") from being randomly loosened due to external shock and vibration, thereby reducing the fastening force.

[0081] A through hole (21") is formed in the center of this elastic grip ring (20") to fit into the end side of the bolt (3). This through hole (21") has a diameter larger than the outer diameter of the bolt (3) so that the bolt (3) can pass through it.

[0082] In addition, an elastic grip (23") is formed protrudingly around the circumference of the through hole (21"), which is divided into a plurality of pieces by a split slit (22"). The elastic grip (23") is inserted into the grip ring insertion groove (12") of the nut portion (10") to enable pre-engagement of the elastic grip ring portion (20") to the nut portion (10"), and when the nut portion (10") is screwed onto the end side of the bolt (3) that has penetrated the fastening object (2), the outer surface of the bolt (3) having a thread formed thereon is pressed against the threaded surface, thereby preventing the loosening prevention nut (1") according to another embodiment of the disclosed content from being arbitrarily loosened from the end side of the bolt (3). This elastic grip (23") is formed by being divided into a plurality of pieces by the split slit (22") and has its own elasticity in the radial direction.

[0083] This elastic grip ring (20") may be manufactured as a single body using a metal material or synthetic resin material.

[0084] Hereinafter, the operation of the anti-loosening nut (1") according to another embodiment of the disclosed content will be described with reference to FIGS. 9 and 10 as follows:

[0085] In another embodiment of the disclosed content, in the case of the anti-loosening nut (1"), a grip ring insertion groove (12") is formed in the nut portion (10") to communicate with the female screw hole (11"), and a plurality of elastic grips (23") are formed protrudingly in the elastic grip ring portion (20") so as to be insertable into the grip ring insertion groove (12"), so that the nut portion (10") and the elastic grip ring portion (20") can be quickly and easily fastened and fixed to the end side of the bolt (3) that has penetrated the fastening object (2) in a state in which the nut portion (10") and the elastic grip ring portion (20") are pre-joined so that a plurality of elastic grips (23") can be inserted into the grip ring insertion groove (12").

[0086] In addition, in the case of the anti-loosening nut (1") according to another embodiment of the disclosed content, the grip ring insertion groove (12") formed in the nut portion (10") is formed so that the inner diameter becomes narrower as it goes toward the female screw hole (11"), so that when the nut portion (10") is fastened to the bolt (3), a plurality of elastic grips (23") are pressed against the outer surface of the bolt (3), especially the screw threads, so that arbitrary loosening can be reliably prevented even when there is an impact or vibration applied from the outside.

[0087]

[0088] Although the preferred embodiments of the present invention have been described with reference to the attached drawings, the embodiments described in this specification and the configurations illustrated in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application. Therefore, the embodiments described above should be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the claims described below rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included in the scope of the present invention.

[0089] [Explanation of symbols]

[0090] 1, 1', 1": Anti-loosening nut

[0091] 2: Object of contract

[0092] 3: Bolt

[0093] 10, 10', 10" : Nut part

[0094] 11, 11', 11': female screw hole

[0095] 12, 12': Grip insertion groove

[0096] 12": Grip ring insertion groove

[0097] 13: Jaw

[0098] 20, 20': Washer part

[0099] 20a: Washer body

[0100] 20b: Elastic coupling ring

[0101] 20": Elastic grip ring

[0102] 21, 21', 21" : Through hole

[0103] 22, 22', 22": Split slit

[0104] 23, 23', 23": Elastic grip

[0105] 24: Stumbling block

[0106] 25: First Public Works

[0107] 26: Ring-shaped joint

[0108] 27: Anti-rotation groove

[0109] 28: Second air raid

[0110] 29: Anti-rotation protrusion

[0111] The disclosed content can be applied to a field related to a pull-up prevention nut that is screwed into a bolt that fastens a fastening object to prevent loosening.

Claims

1. In a loosening prevention nut that is screwed onto the end of a bolt that penetrates the fastening object, A nut part having a female screw hole formed through one side to be screwed into the end side of the bolt, a grip insertion groove formed in communication with the female screw hole on the other side, and a catch formed on the inner wall of the grip insertion groove; and A loosening prevention nut characterized in that it includes a washer portion in which a hole is formed in the center to fit into the end side of the bolt, a plurality of elastic grips are formed protruding around the hole and are divided by a split slit and can be inserted into the grip insertion groove of the nut portion, and at least two of the plurality of elastic grips have a protruding catch that is detachably coupled to the catch step on the outer surface thereof.

2. In claim 1, A loosening prevention nut characterized in that the grip insertion groove is formed so that the inner diameter becomes narrower as it goes toward the female screw hole, so that when the nut portion is fastened to the bolt, the plurality of elastic grips are pressed against the outer surface of the bolt.

3. In claim 1, An anti-loosening nut characterized in that the above washer part is made of metal or synthetic resin.

4. In claim 1, A loosening prevention nut characterized in that the washer part includes a washer body having a first hole formed in the center and a ring-shaped coupling step formed around the first hole, and an elastic grip ring that is coupled to the ring-shaped coupling step of the washer body and has a second hole formed through the center and a plurality of elastic grips protruding around the inner circumference.

5. In claim 4, A loosening prevention nut characterized in that rotation prevention grooves are formed at regular angular intervals on the inner circumference of the ring-shaped coupling step of the washer body, and rotation prevention projections that are inserted and coupled to correspond to the rotation prevention grooves are formed protruding on the elastic grip ring.

6. In claim 4, An anti-loosening nut characterized in that the washer body is made of metal and the elastic grip ring is made of synthetic resin.

7. In any one of claims 1 to 6, A loosening prevention nut characterized in that the nut portion and the washer portion are screwed onto the end side of the bolt that penetrates the fastening object in a pre-assembled state so that the hooking projections of the plurality of elastic grips are engaged with the hooking projections of the grip insertion groove.

8. In the anti-loosening nut that is screwed onto the end of the bolt that penetrates the fastening object, A nut portion having a female screw hole formed through one side to be screwed into the end side of the bolt and a grip insertion groove formed in communication with the female screw hole on the other side; and A loosening prevention nut characterized in that it includes a washer portion in which a hole is formed in the center to fit into the end side of the bolt, and a plurality of elastic grips are formed protrudingly around the hole and are insertable into the grip insertion groove of the nut portion and are divided by a split slit.

9. In claim 8, A loosening prevention nut characterized in that the grip insertion groove is formed so that the inner diameter becomes narrower as it goes toward the female screw hole, so that when the nut portion is fastened to the bolt, the plurality of elastic grips are pressed against the outer surface of the bolt.

10. In claim 8 or claim 9, A loosening prevention nut characterized in that the nut portion and the washer portion are screwed onto the end side of the bolt that penetrates the fastening object in a pre-assembled state so that the plurality of elastic grips are inserted into the grip insertion groove.

11. In the anti-loosening nut that is screwed onto the end of the bolt that penetrates the fastening object, A nut portion having a female screw hole formed through one side to be screwed into the end side of the bolt and a grip ring insertion groove formed in communication with the female screw hole on the other side; and A loosening prevention nut characterized by including an elastic grip ring portion that can be inserted into a grip ring insertion groove of the nut portion and has a hole formed through the center thereof to fit into the end side of the bolt, and a plurality of elastic grips formed by split slits protruding around the hole.

12. In claim 11, A loosening prevention nut characterized in that the grip ring insertion groove is formed so that the inner diameter becomes narrower as it goes toward the female screw hole, so that when the elastic grip ring part is fastened to the bolt, the plurality of elastic grips are pressed against the outer surface of the bolt.

13. In claim 11 or claim 12, A loosening prevention nut characterized in that the nut portion and the elastic grip ring portion are screwed onto the end side of the bolt that penetrates the fastening object in a pre-assembled state so that the plurality of elastic grips are inserted into the grip ring insertion groove.

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