Hinge Screw Head Step-Down Design for Impact Resistance
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Solution Overview
Problem
Electronic devices with hinged units face challenges in resisting impact during falls, as existing designs often concentrate load and impact on specific areas, leading to deformation and damage.
Innovation Solution
The design incorporates a housing made of metal with a resin cover and a screw with a larger-diameter head and step-down part, along with ribbed projections and fitting parts, to distribute impact forces and prevent deformation of hinges and screws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional screw structure is used to attach units, then the device can be assembled, but the screw and hinge are vulnerable to bending or shearing during impact
Solution Approach 1:
The screw head is designed with a larger-diameter part that fits into a larger-diameter step-down part on the housing surface, creating a localized reinforcement zone. This local quality enhancement provides additional support and load distribution at the critical screw head location, preventing bending or shearing during impact while maintaining the overall simplicity of the screw structure
Solution Approach 2:
The fitting part is designed to protrude beyond the head of the screw, creating a preliminary protective structure that engages before the screw head itself during impact events. This preliminary action ensures that impact forces are absorbed and distributed by the fitting part and step-down part before reaching the vulnerable screw shank, preventing bending or shearing of the screw
2Device complexity
If impact forces are concentrated on specific areas, then the structure is simpler, but deformation and damage occur more easily
Solution Approach 1:
Rather than complicating the entire structure, the invention applies local quality enhancement by creating a larger-diameter step-down part on the housing that corresponds to the larger-diameter part on the screw head. This localized structural enhancement provides impact resistance exactly where needed without adding complexity to the overall device structure
Solution Approach 2:
The larger-diameter step-down part acts as an intermediary structure between the screw head and the housing body. It serves as a load-distributing interface that prevents concentrated impact forces from being transmitted directly to the screw shank and hinge, thereby reducing deformation and damage while maintaining structural simplicity
Data Source
AI summary
An electronic device in a first aspect includes: a housing comprising metal that houses an electronic component; a cover comprising resin that covers at least a part of a principal surface of the housing from an outside; and a screw screwed into the housing via a through-hole provided at the cover and, the screw having a head that protrudes to the outside from the cover. A larger-diameter part having a diameter larger than a diameter of a screw part is provided on a head side of the screw. A larger-diameter step-down part that fits the larger-diameter part is provided on the principal surface of the housing.