Injection molding part capable of preventing preassembled nut from falling off

By setting locking teeth on the outer periphery of the pre-installed nut and inserting a flexible wrapping sleeve and elastic pad between them, and filling it with particles with poor thermal stability, the problem of the in-mold injection nut detaching at high temperatures is solved, thereby improving the stability of the connection and product quality.

CN223814240UActive Publication Date: 2026-01-20ZHEJIANG YUANSHENG PLASTIC IND CO LTD
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Patent Information

Application Number
CN202520768085.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-04-22
Publication Date
2026-01-20
Estimated Expiration
2035-04-22

AI Technical Summary

Technical Problem

Existing in-mold injection nuts are prone to detaching from the injection molded part due to expansion under high temperature conditions, resulting in unstable connection and the occurrence of defective products, especially during transportation.

Method used

Multiple locking teeth are integrally formed on the outer circumference of the pre-installed nut, and a flexible wrapping sleeve and an elastic pad are fitted at the annular notch between the locking teeth. The flexible wrapping sleeve is filled with filler particles with poor thermal stability, such as polyvinyl chloride or polypropylene, and the outer layer is nested with an elastic pad to increase friction and prevent the nut from falling off.

Benefits of technology

It effectively prevents nuts from coming off due to expansion under high temperature conditions, improves the stability of the connection, reduces the problem of falling off due to vibration or thermal expansion and contraction, and ensures product quality.

✦ Generated by Eureka AI based on patent content.
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Abstract

The utility model discloses a preassembled nut anti-drop injection molding part, which comprises a preassembled nut, the preassembled nut enters a hole groove with an adaptive size arranged on the injection molding part through stamping, a plurality of latches are integrally formed on the periphery of the preassembled nut, the latches are distributed at intervals along the axial direction of the preassembled nut, an annular notch is formed between every two adjacent latches, and the preassembled nut is inserted into the hole groove. The annular notch is sleeved with a plurality of annular blocking layers, and the outer diameter of the outermost blocking layer is equal to the outer diameter of the annular notch. According to the injection molding part capable of preventing the preassembled nut from falling off, the clamping teeth which are arranged at intervals are integrally formed on the periphery of the preassembled nut, the annular notches are formed among the clamping teeth, the hollow flexible wrapping sleeve is sleeved at the annular notches firstly, and then the thin elastic cushion is nested at the annular notches, so that the wrapping sleeve on the inner side can be restrained to be in a relatively regular state, and the preassembled nut can be prevented from falling off. And the annular gap is completely filled outwards and is in contact with the inner wall of the hole groove, so that the contact friction force is further increased, and the problem that the preassembled nut falls off after swinging and shaking is avoided.
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