Self-Locking Hinge Durability via Force Distribution
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Solution Overview
Problem
The existing image reading apparatuses with self-locking hinges face durability issues due to concentrated reaction forces when the conveyer unit is repeatedly opened and closed, leading to potential damage and reduced longevity.
Innovation Solution
The image reading apparatus incorporates a self-locking hinge system with a rigid attachable member that distributes the torque across the main and auxiliary areas of the bottom cover, using a metal frame to absorb and redirect reaction forces, thereby reducing stress on specific areas and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the self-locking hinge is mounted in the end position closer to the linear opening with the in-conveyer-unit section fixed to the conveyer unit, then the handling convenience and space efficiency are improved, but the reaction force concentrates in the vicinity of the in-conveyer-unit section causing durability issues
Solution Approach 1:
A rigid attachable member (metal frame) is introduced as an intermediary between the self-locking hinge and the bottom cover. This mediator distributes the reaction force from the hinge across a broader area of the bottom cover, preventing concentration of stress at the hinge mounting location while maintaining the compact design and ease of operation.
Solution Approach 2:
The reaction force distribution is extended from a point-like concentration at the hinge mounting position to a distributed pattern across the bottom cover surface. The rigid attachable member transforms the localized force into a distributed load pattern, effectively using spatial dimensionality to mitigate stress concentration.
2Volume of moving object
If the self-locking hinge is mounted at the end position to reduce the entire size of the image reading apparatus, then the compactness is improved, but the concentrated torque causes exhaustion or damage to the bottom cover over long period use
Solution Approach 1:
The rigid attachable member serves as a mediator that allows the self-locking hinge to be positioned at the optimal location for compactness while protecting the bottom cover from damage. The intermediary structure transfers and distributes the mechanical stress, enabling the hinge to be mounted at the end position without compromising the service life of the bottom cover.
3Reliability
If the rigid attachable member extends to include both main area and auxiliary area, then the reaction force distribution is improved, but the device complexity increases
Solution Approach 1:
The rigid attachable member is designed to serve multiple functions: it distributes reaction forces, provides structural support, and acts as a mounting base for the self-locking hinge. By making the attachable member multi-functional, the design achieves improved durability without proportionally increasing complexity, as a single component performs multiple roles.
Data Source
AI summary
An image reading apparatus is provided. The image reading apparatus includes a main unit and a conveyer unit swingably coupled to the main unit via a hinge. The conveyer unit includes a lower cover with an opening, which extends orthogonally to a swing axis of the conveyer unit, and an attachable member. The attachable member includes a main part and an auxiliary part and is fixed to the lower cover by the main part and to a rotatable fixing section of the hinge by the auxiliary part.