Nut washer assembly

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By designing a special structure for the movable washer and nut, the problem of separation and loss of the nut and washer during frequent disassembly is solved, achieving a stable connection and anti-loosening effect in complex environments.

CN224533227UActive Publication Date: 2026-07-21GUANGZHOU GUANGRI ELEVATOR IND

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: GUANGZHOU GUANGRI ELEVATOR IND
Filing Date: 2025-07-14
Publication Date: 2026-07-21

AI Technical Summary

Technical Problem

Nuts and washers are prone to separation during frequent disassembly, leading to the loss of washers, especially in confined or complex environments where they are difficult to find and can result in permanent loss.

Method used

A nut-washer assembly was designed, in which the movable washer and the nut can move relative to each other. The elastic deformation generates a reverse elastic force to increase friction and prevent separation and loss. The assembly includes a special structural design for the smooth shank and protruding part of the nut.

Benefits of technology

It effectively prevents the nut and washer from separating and being lost in scenarios requiring frequent disassembly, increases the stability and anti-loosening performance of the connection, and is suitable for various disassembly environments.

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Abstract

The utility model discloses a nut gasket assembly, including nut and movable gasket, nut is provided with body part, light pole part and convex part, light pole part is from the body part bottom surface and becomes, and the convex part is from the light pole part bottom side extension and becomes, movable gasket is provided with through -hole, and the through -hole of movable gasket is sleeved in the light pole part of nut, and the through -hole diameter of movable gasket is greater than the light pole part diameter of nut, and the through -hole diameter of movable gasket is less than the convex part diameter of nut, and when the body part bottom surface of nut and movable gasket top surface abut, the convex part bottom surface of nut is higher than movable gasket bottom surface. The utility model discloses movable gasket and nut can be relatively movable, and will not fall off separation, simple structure, is applicable to various need regular or often dismounting scene, can effectively prevent the loss caused by nut and gasket separation. Through the elastic deformation of gasket produces reverse spring force, increases the friction of nut and bolt, can prevent the connection slackening caused by dynamic load.

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Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and more specifically, to a nut-washer assembly for preventing washer loss. Background Technology

[0002] In the field of mechanical connections, nuts and washers are the most basic and widely used fastener combination, and their importance is self-evident. Nuts provide axial clamping force through threaded engagement with bolts, and are the core component for connecting and securing parts. Washers, typically placed between the nut and the surface of the connected parts, play a crucial auxiliary role. The main functions of washers include: distributing pressure, providing a support surface, preventing loosening, sealing, and adjusting clearances. Therefore, in most situations requiring reliable fastening, the use of nuts and washers has become a standard configuration and an essential requirement in engineering practice.

[0003] However, in scenarios requiring frequent disassembly, nuts and washers are prone to separation, leading to washer loss. During disassembly, operators typically use tools to loosen and remove the nut. In situations with limited space, poor lighting, where the operator's attention is primarily focused on the nut itself, or when a quick disassembly is required, washers are very likely to slip off the bolt, spring off, or be accidentally knocked off. Especially inside equipment, on aerial work platforms, or in other complex working environments, detached small washers are often difficult to find and may even fall into internal gaps, resulting in permanent loss. Summary of the Invention

[0004] The purpose of this utility model is to overcome the defects and deficiencies of the prior art and provide a nut and washer assembly in which the movable washer and the nut can move relative to each other without falling off or separating. The movable washer is in a loose but not detached state, thus avoiding the risk of losing the movable washer.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A nut and washer assembly includes a nut and a movable washer. The nut has a body, a smooth rod, and a protrusion. The smooth rod extends downward from the bottom of the body, and the protrusion extends laterally from the bottom of the smooth rod. The movable washer has a through hole that fits onto the smooth rod of the nut. The diameter of the through hole of the movable washer is larger than the diameter of the smooth rod of the nut, and the diameter of the through hole of the movable washer is smaller than the diameter of the protrusion of the nut. When the bottom surface of the body of the nut abuts against the top surface of the movable washer, the bottom surface of the protrusion of the nut is higher than the bottom surface of the movable washer.

[0007] Furthermore, the height of the smooth rod is greater than the depth of the through hole.

[0008] Furthermore, the movable gasket has a thin-walled structure.

[0009] Furthermore, the movable pad is frustum-shaped.

[0010] Compared with existing technologies, this utility model features a movable washer and nut that can move relative to each other, resulting in a simple structure suitable for various scenarios requiring periodic or frequent disassembly. It effectively prevents loss due to separation of the nut and washer. The elastic deformation of the washer generates a reverse elastic force, increasing the friction between the nut and bolt, thus preventing loosening of the connection due to dynamic loads. Attached Figure Description

[0011] Figure 1 These are sectional and side view structural diagrams of the nut and washer assembly.

[0012] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0013] Explanation of icon numbers:

[0014] 1-Nut; 11-Body part; 111-Bottom surface of body part; 12-Smooth rod part; 13-Protrusion; 131-Bottom surface of protrusion; 2-Modible washer; 21-Through hole; 22-Top surface of movable washer; 23-Bottom surface of movable washer. Detailed Implementation

[0015] The nut and washer assembly of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0016] Please see Figure 1 and Figure 2 This utility model discloses a nut and washer assembly, including a nut 1 and a movable washer 2. The nut 1 has a body portion 11, a smooth rod portion 12, and a protrusion 13. The smooth rod portion 12 extends downward from the bottom surface 111 of the body portion, and the protrusion 13 extends laterally from the bottom of the smooth rod portion 12. The movable washer 2 is a frustum-shaped thin-walled structure with a through hole 21, and the through hole 21 of the movable washer 2 is fitted onto the smooth rod portion 12 of the nut 1.

[0017] The diameter of the through hole 21 of the movable washer 2 is larger than the diameter of the smooth rod portion 12 of the nut 1, and the diameter of the through hole 21 of the movable washer 2 is smaller than the outer edge diameter of the protrusion 13 of the nut 1. The height of the smooth rod portion 12 is greater than the depth of the through hole 21. When the bottom surface 111 of the body portion of the nut 1 abuts against the top surface 22 of the movable washer, the bottom surface 131 of the protrusion of the nut 1 is higher than the bottom surface 23 of the movable washer.

[0018] When the nut and washer assembly is in operation, the bottom surface 111 of the nut 1 body abuts against the top surface 22 of the movable washer. The thin wall of the movable washer 2 is compressed and undergoes elastic deformation, generating a reverse elastic force, which increases the friction between the nut 1 and the bolt, preventing loosening of the connection due to dynamic load. When the nut assembly is separated from the bolt, since the diameter of the through hole 21 of the movable washer 2 is larger than the diameter of the smooth rod portion 12 of the nut 1 and smaller than the outer edge diameter of the protrusion 13 of the nut 1, the movable washer 2 and the nut 1 can move relative to each other without falling off or separating. That is, the movable washer 2 is in a loose but not detached state, thereby avoiding the risk of losing the movable washer 2.

[0019] The above description is a detailed description of the preferred embodiments of the present utility model. However, the embodiments are not intended to limit the scope of the patent application of the present utility model. All equivalent changes or modifications made under the technical spirit disclosed in the present utility model should fall within the patent scope covered by the present utility model.

Claims

1. A nut and washer assembly, characterized in that, The device includes a nut and a movable washer. The nut has a body, a smooth rod, and a protrusion. The smooth rod extends downward from the bottom of the body, and the protrusion extends laterally from the bottom of the smooth rod. The movable washer has a through hole that fits onto the smooth rod of the nut. The diameter of the through hole of the movable washer is larger than the diameter of the smooth rod of the nut, and the diameter of the through hole of the movable washer is smaller than the diameter of the protrusion of the nut. When the bottom surface of the body of the nut abuts against the top surface of the movable washer, the bottom surface of the protrusion of the nut is higher than the bottom surface of the movable washer.

2. The nut and washer assembly according to claim 1, characterized in that, The height of the smooth rod is greater than the depth of the through hole.

3. The nut and washer assembly according to claim 1, characterized in that, The movable gasket has a thin-walled structure.

4. The nut and washer assembly according to claim 1 or 3, characterized in that, The movable gasket is truncated cone-shaped.