Conveyance Seat Cable Routing and Bracket Rigidity
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Solution Overview
Problem
Conventional conveyance seats with panel type seatback frames face difficulties in routing and fixing structures for operation cables and lever brackets, which are similar to those in pipe type frames, leading to potential cable entanglement and reduced rigidity.
Innovation Solution
A conveyance seat design featuring a panel type seatback frame with a routing restricting portion to prevent cable entanglement and a lever bracket fixed via multiple points to enhance rigidity, utilizing a gate-shaped rigid-frame structure with side frame portions, an upper panel, and support brackets to distribute operation forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the operation cable is routed through the space between the bracket and upper panel portion, then the routing path is simplified, but the cable may get caught and hinder operation
Solution Approach 1:
A cable guide member is introduced as an intermediary component between the bracket and upper panel portion. This guide member channels the operation cable along a predetermined path, preventing the cable from getting caught in the space while maintaining the simplified routing approach. The guide member acts as a mediator that resolves the conflict between easy routing and reliable operation.
2Device complexity
If the lever bracket is fixed at only one point on the seatback frame, then the fixing structure is simplified, but the rigidity against operation force is reduced
Solution Approach 1:
The fixing structure is segmented into multiple fixing points distributed across the bracket. Instead of a single complex fixed point, the bracket is anchored at multiple locations (e.g., first and second fixing points) on the seatback frame. This segmentation distributes the operation force across multiple attachment points, enhancing overall rigidity while keeping each individual fixing point relatively simple.
3Strength
If the panel type seatback frame uses a rigid-frame structure with multiple joining portions, then the rigidity is enhanced, but the difficulty in adapting cable routing and bracket fixing structures increases
Solution Approach 1:
The bracket fixing structure is segmented into multiple independent fixing points that can be separately implemented on the rigid-frame structure. This allows the bracket to be securely attached to different portions of the rigid frame without requiring a completely new integrated design, thus adapting the fixing structure to the rigid frame while maintaining modularity.
Solution Approach 2:
The cable guide member serves as an intermediary that adapts the cable routing to the rigid-frame structure. It provides a standardized routing path that can be accommodated on the rigid frame without requiring complex custom routing designs, thus mediating between the rigid frame structure and the cable routing requirements.
Data Source
AI summary
Provided is a conveyance seat. The conveyance seat comprises: a seatback frame that constitutes a seatback; a bracket that is configured to support an operation lever provided on an upper end side of the seatback; an operation cable that transmits operation of the operation lever; and a routing restricting portion that is provided in at least one of the bracket and an upper panel portion and restricts a routing direction of the operation cable.