Titanium Hammer Head Locking Assembly Against Impact Loosening
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Solution Overview
Problem
Existing hammers, particularly two-piece designs, face challenges in maintaining secure assembly of the hammer head and handle under repeated impact, leading to potential axial and rotational movement, which compromises safety and durability.
Innovation Solution
A two-piece hammer design featuring a titanium handle and a hardened steel head, secured by a locking mechanism with a wedge and fastener, which includes a hoop with a nub-and-notch configuration to prevent axial and rotational movement, ensuring the head remains tightly assembled even under heavy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a two-piece hammer design with mechanical fasteners is used, then the handle and head can be assembled separately with different materials, but the assembly may experience axial and rotational movement under repeated impact
Solution Approach 1:
The hammer is divided into separate head and handle components that can be manufactured from different materials (e.g., steel head, titanium handle) and assembled together, allowing material optimization for each component while maintaining overall structural integrity through the locking mechanism
Solution Approach 2:
The locking mechanism features pre-configured geometric elements (nub on the head, corresponding notch and flattened section on the handle) that are formed during manufacturing. These preliminary structural features ensure that when assembled, the components automatically engage to prevent both axial separation and rotational movement without requiring additional adjustment or tightening during use
2Ease of manufacture
If traditional mechanical fasteners are used to secure the head to the handle, then assembly is straightforward, but the fasteners may fail under repeated impact loads
Solution Approach 1:
The locking mechanism incorporates pre-formed geometric locking features (nub, notch, flattened wall section) that are integrated into the head and handle during manufacturing. These features create an inherent mechanical interlock that resists both axial and rotational forces, eliminating the need for separate fasteners while maintaining assembly simplicity
Solution Approach 2:
The locking mechanism addresses both axial and rotational movement simultaneously through a multi-dimensional geometric interlock. The nub-notch interface prevents rotation in the horizontal plane, while the flattened wall section engagement prevents axial separation, creating a three-dimensional constraint system that secures the joint against all primary failure modes
Data Source
AI summary
A handheld titanium hammer including a handle with a transverse hoop at one end, and a hammer head inserted therein. The hoop at the front-facing edge includes a notch. The hammer head includes a flange with a nub and an intermediate portion with a downward facing sloped surface and a recessed bed. A wedge having an upward facing angular surface fits into the hoop from the back end and pushes against the sloped surface of the intermediate portion for a wedging action. The wedging action also lifts the bed into a flattened wall section of the hoop capturing it therein. The nub of the flange is captured within the notch in the hoop. A fastened secures the wedge and hammer head together inside the hoop.