Opening-Closing Lock Structure for Stronger Force Transmission
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Solution Overview
Problem
Existing lock devices face challenges in increasing the breaking strength of the operating member without increasing its rigidity, leading to difficulties in enhancing the operating force transmission efficiency.
Innovation Solution
A lock device design that includes a stopper portion connected to an operating load transmission wall portion, with shaft portions protruding from both sides, supported by deformation restriction wall portions, which restricts rotation by contacting a stopper receiving portion, allowing the operating load to be transmitted through these wall portions and shaft support structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigidity of the operating member is increased to increase breaking strength, then breaking strength is improved, but mass increases
Solution Approach 1:
The operating member has different rigidity characteristics in different regions: the cylindrical portion has lower rigidity to allow deformation, while the shaft support portions and stopper portion have higher rigidity to maintain structural integrity. This local differentiation allows the operating member to achieve sufficient breaking strength without uniformly increasing mass throughout the entire component.
Solution Approach 2:
The operating member is designed to dynamically deform during operation, particularly the cylindrical portion which bends to transmit operating loads. This dynamic deformation capability allows the structure to absorb and distribute stresses without requiring excessive rigidity, thereby avoiding unnecessary mass increase while maintaining breaking strength.
2Force
If rigidity of the operating member is increased to improve operating force transmission efficiency, then operating force transmission is improved, but device complexity increases
Solution Approach 1:
The operating member is segmented into distinct functional regions: the cylindrical portion for load transmission and deformation, the shaft support portions for rotational support, and the stopper portion for limiting rotation. This segmentation allows each region to be optimized for its specific function, achieving efficient force transmission without requiring the entire structure to be overly complex or rigid.
Solution Approach 2:
The operating member utilizes controlled changes in rigidity parameters across different regions. The cylindrical portion has lower rigidity to enable deformation for force transmission, while the shaft support portions maintain higher rigidity. This parameter differentiation achieves efficient operating force transmission without uniformly increasing structural complexity throughout the entire operating member.
Data Source
AI summary
A lock device for an opening-closing body includes: a base member; and an operating member. The operating member has an operating plate portion, an operating portion, an operating load transmission wall portion protruding, the shaft portions disposed so as to protrude from both sides of the operating load transmission wall portion or the shaft support portions, and a stopper portion connected to the operating load transmission wall portion on a side of the operating portion with respect to the shaft portions or the shaft support portions. The base member has a pair of deformation restriction wall portions disposed outside portions of the operating load transmission wall portion where the shaft portions or the shaft support portions are provided, the shaft support portions or the shaft portions, and a stopper receiving portion that is configured to restrict rotation of the operating member.