Scissor Linkage With Offset Pivots for Lower Stress
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Solution Overview
Problem
Existing scissor linkages suffer from high manufacturing costs and stress concentration at pivot points, which can reduce durability and aesthetics.
Innovation Solution
The scissor linkage design includes offset end portions on support members, allowing for direct pivot connections without additional structures, reducing stress concentration and manufacturing costs while enhancing durability and appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional scissor linkages use welded pivot support structures at each end of support members, then the linkage can be assembled, but stress concentration occurs at pivot points reducing durability and aesthetics
Solution Approach 1:
The support members are designed with asymmetric geometry where the pivot locations are offset from the central longitudinal axis. This asymmetry redistributes the stress distribution pattern, preventing stress concentration at traditional welded pivot points and improving durability while maintaining aesthetic appearance.
Solution Approach 2:
The patent applies different geometric properties to different portions of the support members. Specifically, the end portions have offset pivot locations while the central portions maintain structural integrity, creating localized stress management zones that enhance overall durability without compromising the entire structure.
2Ease of manufacture
If traditional scissor linkages use additional welded pivot support structures, then pivot connections can be made, but manufacturing costs increase
Solution Approach 1:
The patent merges the support member body and pivot support structure into a single integrated component. The offset pivot locations are directly formed as part of the support member geometry, eliminating the need for separate welded pivot support structures and reducing manufacturing complexity and cost.
Solution Approach 2:
The invention extracts the unnecessary welded pivot support structures from the traditional design, retaining only the essential support member with integrated offset pivot locations. This simplification reduces manufacturing steps, material usage, and overall production cost.
Data Source
AI summary
A scissor linkage according to the disclosure may include a first support member including a first central portion and a first end portion having a first end pivot location. The first support member may further include at least one bend so that the first end portion is offset with respect to a longitudinal axis that extends through the first central portion. In addition, the scissor linkage may include a second support member having a second end portion attached to the first end portion of the first support member at the first end pivot location of the first support member so that the second support member is pivotable about a pivot axis that extends through the first end pivot location of the first support member.