Heavy buffer door closer

By designing the transmission gear set and the limiting structure, the impact force problem of the buffer door closer when the door is closed is solved, achieving stable buffering and improved safety, and simplifying the installation and maintenance process.

CN224173919UActive Publication Date: 2026-04-28GUANGDONG HARDWAY TECH CO LTD
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Patent Information

Application Number
CN202520835040.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-04-29
Publication Date
2026-04-28
Estimated Expiration
2035-04-29

AI Technical Summary

Technical Problem

Existing door closers cannot provide a stable buffering effect during the opening and closing of doors, resulting in a large impact force when the door closes, which affects the safety and lifespan of the door. Furthermore, the opening angle is uncontrollable, which can easily lead to door collision damage or damage to the door closer structure.

Method used

The system uses a transmission gear set to drive a rack and pinion to control the opening and closing of the buffer. Combined with a limit structure and positioning pin, it ensures that the door automatically, slowly and smoothly closes at a specific angle. The connection design between the top cover and the outer shell facilitates installation and disassembly.

Benefits of technology

It achieves stable buffering when the door closes, avoiding impact and noise, improving safety and lifespan, and is easy to install and maintain.

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Abstract

The utility model discloses a heavy buffering door closer which comprises a shell, a cavity, a rack and a hook part. A mounting groove is formed in the shell, and a top cover is arranged at the top of the shell; the cavity is formed in the shell and located on one side of the mounting groove, and a buffer is arranged in the cavity; the buffer has the advantages that the transmission gear set drives the rack and the drag hook to control the buffer to be opened and closed, the stable buffering effect can be provided in the door opening and closing process, when the door is closed, the door can be automatically, slowly and stably closed from 80 degrees, and large impact force generated when the door is rapidly closed is avoided; the maximum door opening angle of the product is limited to be 94 degrees, and the door can be freely stopped between 85 degrees and 94 degrees, so that the design can meet the use requirements of daily passage and the like; the whole transmission structure is more stable through the fact that a positioning pin connected in the shell penetrates through a plurality of driven gears, a positioning block of a driving gear is matched with a positioning part of the shell, the sliding connection effect of a tooth groove on a rack is achieved, and the like.
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