Conveyance Seat Link Mechanism Component Reduction
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Solution Overview
Problem
Conventional conveyance seat height adjustment mechanisms are complex and require a large number of components to restrict the rotation ranges of drive links and operation levers, leading to increased complexity and weight.
Innovation Solution
A conveyance seat design that includes a link member rotatably mounted on the cushion frame, a gear part engaging with the link member, a link-rotation restricting member to limit the rotation range, and an operating section that adjusts the height through the gear part, where the movement of the operating section is restricted by the link-rotation restricting member, reducing the number of components needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate restriction member is provided to restrict the movement of the operating section, then the operation range can be limited, but the number of components increases and device complexity increases
Solution Approach 1:
The patent combines the link-rotation restricting member and the operating section restriction function into a single integrated component. The link-rotation restricting member not only limits the rotation of the link member but also simultaneously restricts the movement of the operating section through its interaction with the rotation application section, eliminating the need for a separate restriction member and reducing overall device complexity
Solution Approach 2:
The link-rotation restricting member is designed to perform multiple functions: it restricts the rotation range of the link member and simultaneously restricts the movement range of the operating section. This multi-functional design allows a single component to achieve what would traditionally require multiple separate components, thereby simplifying the overall mechanism
2Ease of operation
If multiple separate components are used to restrict movement, then each function can be independently optimized, but the overall device weight and complexity increase
Solution Approach 1:
By merging the movement restriction function into the existing link-rotation restricting member, the patent eliminates the need for additional separate components that would contribute to overall weight. The integrated design ensures that the same structural element performs multiple functions without requiring additional mass
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration simplifies the component count, improves rigidity, and reduces shock when reaching the operation range limit, while maintaining effective height adjustment functionality.
Implementation Method 1
a gear part which engages with the link member and rotates the link member
Implementation Method 2
the movement of the operating section is restricted when the link-rotation restricting member abuts on the rotation application section
Data Source
AI summary
The number of components required to restrict the movement of an operating section, when a cushion frame is moved in the height direction, and a link member, which is for moving the cushion frame, is reduced. The seat is provided with: a drive link that is rotatably attached to the cushion frame and that moves the cushion frame in the height direction according to rotation thereof; a gear part that engages with the drive link and that rotates the drive link; a link-rotation restricting member for restricting the rotation range of the drive link; an operating section that accepts an operation for adjusting the height of the cushion frame; and a rotation application section for rotating the drive link via the gear part according to the operating section. The movement of the operating section is restricted as a result of the link-rotation restricting member abutting against the rotation application section.