Hammer front cylinder assembly

The electric hammer front cylinder assembly design with dual springs working together solves the problems of locking reliability and starting effort, realizing labor-saving starting of the electric hammer and portability for high-altitude operations, and improving the stability of the locking sleeve and the life of the springs.

CN224347793UActive Publication Date: 2026-06-12YONGKANG INGHAN ELECTRIC TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
YONGKANG INGHAN ELECTRIC TECH CO LTD
Filing Date
2025-06-20
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

The locking springs in the existing electric hammer front cylinder assembly are insufficient in balancing locking reliability and ease of starting, resulting in difficulty in starting the electric hammer, especially when working at heights.

Method used

The design employs a dual-spring synergy, including a tower-shaped spring and a constant-diameter compression spring. It reduces starting resistance by transmitting the separation force along a stepped path and gradually increases the locking force during use to ensure that the drill bit does not loosen.

Benefits of technology

It achieves labor-saving operation when starting the electric hammer, improves locking reliability, meets the portability requirements of high-altitude operations, reduces the downward pressure during startup, and extends the service life of the spring.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224347793U_ABST
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Abstract

This utility model discloses a front cylinder assembly for an electric hammer, comprising a front cylinder, inside which a cylinder and a rotating sleeve are assembled. Several first steel balls are embedded in the cylinder wall of the rotating sleeve to prevent the drill bit from dislodging. A locking sleeve for pressing and releasing the first steel balls is slidably fitted on the rotating sleeve. A spring assembly is assembled behind the locking sleeve to keep it in the locked position. The spring assembly includes a first spring, a second spring, and a supporting plate. The supporting plate is fitted onto the rotating sleeve and located behind the locking sleeve. The front end of the first spring abuts against the rear end face of the locking sleeve, and its rear end abuts against the front wall of the supporting plate. The sleeve end of the cylinder is fitted onto the rotating sleeve, allowing the rotating sleeve to slide axially relative to the cylinder. The outer wall of the sleeve end forms a supporting edge. The front end of the second spring abuts against the rear wall of the supporting plate, and its rear end abuts against the supporting edge. This utility model utilizes the synergistic effect of two springs to provide reliable locking force while reducing the downward pressure required during startup.
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