CN213360781U

CN213360781U - Nut anti-loosening accessory

Info

Publication number: CN213360781U
Application number: CN202021802552.1U
Authority: CN
Inventors: 冯鲁民
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-25
Filing date: 2020-08-25
Publication date: 2021-06-04
Anticipated expiration: 2030-08-25

Abstract

A nut anti-loosening accessory relates to the technical field of loosening prevention of threaded fasteners. The anti-loosening purpose between the bolt and the nut can be realized only by pressing or smashing the anti-loosening accessory and the protective cap into the nut from the top of the nut along the axis of the thread after the common bolt and the nut are pre-tightened, and the anti-loosening nut has the dustproof, waterproof and antirust protective functions. The anti-loosening accessory and nut protecting cover comprises a nut limiting device and a screw rod limiting device. The nut limiting device is a structure matched with the outline of the nut, and the bolt limiting device is a structure that at least one bolt limiting device is distributed on an inner cylindrical surface matched with the diameter of the screw rod along the axis direction. The application condition of the technology is that the bolt thread is required to be exposed out of the top of the nut by at least 2-4 buttons. The scheme has the advantages of simple structure, low cost, convenient production, simple and convenient operation, convenient disassembly, easy installation in a large quantity, repeated use and particular suitability for bridge fastening construction and common fastening operation.

Description

Nut anti-loosening accessory

Technical field the utility model relates to a locking technique of taking off of fastener, especially friction locking fastener or locknut.

The slotted nut in the background technology is a commonly used anti-loose nut and is mostly applied to anti-loose of an axle nut originally.

Patent CN209925407U "a bolt anti-loosening device" proposes another application of using slotted nuts for anti-loosening. The utility model provides a tail end at the screw rod sets up a little outer hexagonal structure to open a through-hole on this little outer hexagonal structure. After the slotted nut is pre-tightened, a cover with a hole and a center of which can be matched with the small outer hexagonal structure is used for penetrating through the small outer hexagonal structure and attaching to the slotted end of the slotted nut. The cover is also provided with two clips which can be inserted into the groove of the slotted nut, so that the groove position of the slotted nut and the small outer hexagonal structure of the screw rod form fixed positions, and finally, the pin is inserted into the through hole on the small outer hexagonal structure to prevent the cover from falling off, thereby achieving the anti-loosening effect of the slotted nut.

Patent CN209875691U "a non-loose screw assembly" proposes a solution similar to the above solution, but applied to a common nut, the tail of the bolt also has a protrusion, so that a cover with holes is embedded on the angular protrusion.

The design is the same as the previous proposal, and special designs such as holes are needed to be made on the screw rod, and a small outer hexagonal or four-corner convex structure is arranged at the tail end of the screw rod.

The lock washer with ratchet is a common solution in the technical solution that the bolt and the screw are not specially designed for the purpose of locking. The washer is usually ratcheted on both sides to prevent rotation of the washer with respect to the nut and the part surfaces, respectively. However, in strong transverse vibration, the gasket and the surface of the part usually have a slippage phenomenon, and a transverse shaft torsion phenomenon also exists between the gasket and the nut, so that the premise that relative movement does not exist between the gasket and the surface of the part and between the gasket and the supporting surface of the nut is inevitably destroyed. Such gasket failure is therefore due to the untrue nature of its anti-loosening principle.

In the practice of thread anti-loosening, the anti-loosening function achieved after the thread is pre-tightened is mostly in the form of anti-loosening fittings, but the anti-loosening fittings are generally in the scheme of pins and wire bundles. This anti-loosening solution is complicated to operate, especially at installation.

The utility model provides a locking accessory based on ordinary bolt and nut need not to do any extra design on bolt and nut, just can realize locking purpose between bolt and the nut, still can add dustproof waterproof rust-resistant nut lid function for the nut.

The utility model discloses locking accessory and nut protective cover, including nut limiting device and screw rod limiting device. The nut limiting device is a structure matched with the outline of the nut and comprises an inner hexagonal structure, an inner tetragonal structure, at least one clamp contacting the outer facade of the nut and at least one clamp embedded in a crenellated port on a similar slotted nut; the bolt limiting device is an inner cylindrical surface matched with the diameter of the screw rod, and at least one bolt limiting device is distributed on the inner cylindrical surface along the axis direction and comprises a ratchet and a single edge.

After the nut is prefastened, will locking accessory and helmet follow the bolt screw thread department that the nut top exposes and impress, or use the hammer to strike and pound and go into, make nut limiting device coincide with nut outline adaptation, a shallow slot is drawn in the external screw thread outer fringe of bolt stopper simultaneously, makes single-blade or ratchet embedding external screw thread surface, causes unable rotation between nut and the screw rod screw thread, reaches the locking purpose of nut.

The bolt limiting device also has a bolt limiter aiming at the end face of the tail part of the bolt. The stop is also of the single-edged or ratchet type. When the utility model discloses a during the helmet scheme, the blade that is located this bolt stopper on the inside top of helmet will be by the material surface of embedding bolt afterbody terminal surface, forms the restriction to the bolt for the nut position. However, this solution is not described as a preferred embodiment of the invention, since it is easy to be out of limits.

The utility model discloses an application condition is that the bolt screw thread exposes the environment that 2 ~ 4 knots in nut top, nevertheless if under the applied condition that flushes at bolt tail end and nut upper portion, just must adopt the bolt stopper scheme to bolt rear end face. The utility model has the advantages of, easy and simple to handle during a large amount of installations, only need during the dismantlement sled the helmet can. And the utility model discloses a cost is lower, can one-time stamping forming, and it is stretch forming moreover much, and the mould is longe-lived, is favorable to reduce cost.

Description of the drawings:

figure 1 is a first preferred embodiment of the present invention of a facade clip and single blade solution;

FIG. 2 is a second preferred embodiment of the present invention of a hexagonal-inside and ratchet helmet solution;

FIG. 3 is a crenellated clip solution to a slotted nut according to a third preferred embodiment of the present invention;

figure 4 is a third preferred embodiment of the present invention directed to a reinforcing structure for a slotted nut crenel clip.

The reference numbers are exemplary: 1. a locking fitting; 11. a nut limiting device; 111. an internal hexagonal configuration; 113. an outer facade clamp; 114. a slotted nut crenelation clamp; 12. a bolt limiting device; 121. an inner cylindrical surface; 122. a bolt retainer; 1221. a single edge; 1222. a ratchet; 13. the top of the bolt limiting device; 2. a steel wire retainer ring; 21. a steel wire retaining ring groove.

The specific implementation mode is as follows:

the utility model discloses a first preferred embodiment is that nut stop device adopts the checkpost of two outer facades of contact nut, and the scheme that bolt stopper adopted the single-edged.

As shown in figure 1, the anti-loosening fitting (1) is composed of an upper part and a lower part, wherein the upper part is provided with a bolt limiting device (12), and the lower part is provided with a nut limiting device (11). The nut limiting device (11) at the lower part adopts two oppositely placed clips (113) to form a door-shaped shape which is matched with the outer hexagonal opposite side of the nut. If the nut rotates relative to the bolt, the outer hexagonal vertical surface of the nut inevitably drives the anti-loosening accessory (1) to rotate synchronously through the door-shaped structure of the nut limiting device (11), so that the bolt limiting device (12) at the upper part rotates synchronously. The bolt limiting device (12) at the upper part is matched with the external diameter of the external thread at the screw rod, is an inner cylindrical surface (121), and is provided with six inward sharp raised lines, namely a single blade (1221), along the axial direction. The single-edged edge faces radially towards the axis of the inner cylindrical surface (121). In addition, the top (13) of the bolt limiting device is open, so that the exposed length of the external thread can be matched.

When the anti-loosening accessory is placed on the fastened bolt and nut, the lower end of the door-shaped structure can be aligned to the outer vertical surface of the nut at first, and the single-edge cutting edge of the bolt limiting device is not enough to contact the bolt threads at the moment. At the moment, the anti-loosening accessory is forcibly knocked down, the single-edge cutting edge of the bolt limiting device breaks a shallow groove in the surface of the external thread of the bolt, so that the single edge penetrates into the outer edge of the external thread, and the effect of preventing the bolt limiting device from rotating relative to the bolt is achieved. This achieves the object of the present invention.

The utility model discloses a second preferred embodiment is that nut stop device adopts hexagon socket head cap mechanism, and the bolt stopper adopts the scheme of ratchet and helmet.

As shown in fig. 2, the loose fitting (1) in this embodiment is in the form of a nut helmet, since the top (13) of the bolt retainer in the loose fitting (1) is blind. On the inner cylindrical surface (121) of the bolt limiting device (12), the bolt limiter (122) is in the form of ratchet teeth (1222). The utility model discloses an application that this kind of scheme was applicable to locking function and nut helmet combination.

In order to avoid the loosening prevention fitting (1) from axial movement in a strong vibration environment, so that the loosening prevention fitting is separated from the nut to cause failure, a steel wire retainer ring (2) is arranged at the lower part of the nut limiting device in the embodiment. The steel wire retainer ring (2) is embedded in the steel wire retainer ring groove (21). Accordingly, a matching annular groove is also required on the nut.

The third preferred embodiment of the present invention is directed to a split nut.

As shown in fig. 3, the nut stopper (11) and the bolt stopper (12) of the loose fitting (1) are constituted by six slotted nut crenels catches (114). The slotted nut crenel clip (114) is configured to constitute both the nut stop (11) and the bolt stop (12) in this embodiment. The inner cylindrical surface (121) of the slotted nut crenelle clip (114) is in the form of a bolt stop (12) on which a bolt stop is in the form of a single blade (1221). The single-edged tip in fig. 3 has a simple tip transition form. The side of the slotted nut crenelle catch (114) is in contact with the slotted nut, thus forming a nut limiting device (11). The number of slotted nut crenels is at least one, but preferably balanced if more than one.

Another type of lock fitting for a slotted nut is somewhat different in form from the configuration shown in fig. 3. As shown in fig. 4, six slotted nut crenels catches (114) are located at the intersecting edges of adjacent facade of the nut. The design has higher strength, and can ensure the depth of the bolt limiter (122) penetrating into the outer edge of the external thread.

The utility model provides a bolt stopper, no matter be single-edged or ratchet, its sword prelude of inserting the external screw thread outer fringe at first has the general transition body of tool bit, and this does not show in the picture of some preferred embodiments above, but is not the transition body structure contrary to the utility model discloses the original aim at, and makes this kind of transition body experience have many forms, and its form is not the innovation scope of the utility model. The utility model discloses a bolt limiting device's blade is opened the form at bolt external screw thread outer fringe surface and bolt tail end top. This kind of technical form is not only single-edged and ratchet can realize, the utility model discloses also no longer describe.

The utility model discloses a nut stop device's form because the profile of nut has very many forms in the reality, for example four directions nut etc. consequently except that the outer facade of contact nut or slotted nut buttress mouthful checkpost, interior hexagonal in this scheme, all the other no longer give consideration to everyone.

In order to prevent that nut limiting device from upwards breaking away from the nut along the axial from the outer facade of nut in using the utility model provides a nut limiting device middle part sets up the axial stopper also is natural design direction. For example, a steel wire retainer ring is arranged at the middle part of the nut limiting device corresponding to the middle section of the nut, and an annular groove matched with the steel wire retainer ring is arranged at the corresponding position in the middle of the nut. Since the present invention does not involve any other design on the nut, such a design is not intended to be a scope of the embodiments of the present invention, but is not contrary to the inventive idea.

Claims

1. The utility model provides a nut locking accessory, includes nut stop device and bolt stop device, and nut stop device is the structure of an adaptation nut profile, characterized by: the bolt limiting device comprises an inner construction surface matched with the screw rod, and at least one bolt limiting stopper is distributed on the inner construction surface.

2. The nut lock fitting of claim 1 wherein: the inner structural surface is an inner cylindrical surface matched with the outer diameter of the screw thread, and at least one bolt limiter is distributed on the inner cylindrical surface along the circumferential direction.

3. The nut lock fitting of claim 2 wherein: the bolt limiter is of a single-blade construction extending in the axial direction.

4. The nut lock fitting of claim 2 wherein: the bolt stop is of an axially elongated ratchet configuration.

5. A nut lock fitting as claimed in claim 3 or 4 wherein: the top end of the bolt limiting device is sealed.

6. The nut lock fitting of claim 1 wherein: the inner structure surface is an inner circle plane matched with the end surface of the tail part of the screw rod, and at least one bolt limiter is distributed on the inner circle plane along the circumferential direction.

7. A nut lock fitting as defined in claim 6, wherein: the bolt limiter is a single-blade structure which is contacted with the end face of the tail part of the bolt.

8. A nut lock fitting as defined in claim 6, wherein: the bolt limiter is a ratchet structure which is contacted with the end face of the tail part of the bolt.

9. A nut lock fitting as claimed in claim 3 or 4 wherein: the nut limiting device is at least one slotted nut crenelation clamp.