Fold-Flat Seat Assembly With Sliding Cushion Clearance
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Solution Overview
Problem
Existing vehicle seats occupy excessive space and obstruct the field of view when backrests are folded down due to protrusions like lumbar supports, compromising passenger comfort and movement space.
Innovation Solution
A seat assembly with a base, seat cushion bracket, and backrest bracket that allows independent movement and rotation, enabling the seat cushion to move away from the backrest to accommodate protrusions and reduce overall height, facilitated by a connecting rod mechanism and sliding grooves for precise adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the backrest is folded down onto the seat cushion, then space for passenger movement is increased and field of view is improved, but the overall height of the seat remains large due to protrusions like lumbar support
Solution Approach 1:
The seat structure is divided into independent movable components: the seat cushion bracket and backrest bracket can move independently relative to the base. The cushion bracket moves along a guide sliding groove while the backrest bracket rotates, allowing the backrest to be folded down without the protruding lumbar support creating excessive height, thus reducing the overall seat height while maintaining passenger space.
Solution Approach 2:
The seat employs dynamic mechanisms where the seat cushion bracket is movably connected to the base and can translate along a guide sliding groove, while the backrest bracket is rotatably connected and can change its angle relative to the base. This dynamic configuration allows the backrest to be folded down compactly, reducing the overall height while maximizing passenger movement space.
2Ease of operation
If protrusions like lumbar support are added to the backrest, then support for passenger comfort is improved, but space is occupied and field of view is obstructed when backrest is folded down
Solution Approach 1:
The lumbar support protrusion is segmented from the main backrest structure. When the backrest bracket rotates to fold the backrest down, the lumbar support protrusion moves along with the backrest bracket but does not interfere with the folded position, allowing comfortable support features to coexist with compact folding capability.
Solution Approach 2:
The lumbar support protrusion is positioned and oriented in a specific dimensional configuration that allows it to provide ergonomic support when the backrest is upright, while when the backrest is folded down, the protrusion's position in three-dimensional space changes such that it no longer obstructs the passenger's field of view or movement space.
3Adaptability or versatility
If the backrest bracket is rotatably connected to allow angle adjustment, then adaptability is improved, but device complexity increases
Solution Approach 1:
The seat mechanism is segmented into independent functional modules: the guide sliding groove mechanism for cushion bracket movement, the rotating connection for backrest bracket angle adjustment, and the connecting rod linkage. Each module performs a specific function, making the overall system adaptable while managing complexity through modular design.
Solution Approach 2:
The backrest bracket is rotatably connected to the base, enabling dynamic angle adjustment for adaptability. The rotating connection allows the backrest to achieve various angles while the guide sliding groove constrains the cushion bracket to move along a specific path, creating a coordinated dynamic system that balances versatility with controlled complexity.
4Volume of moving object
If the seat cushion bracket moves away from the backrest bracket, then space is reserved for accommodating protrusions, but the structure requires additional moving components
Solution Approach 1:
The guide sliding groove and the moving connection between the cushion bracket and base are merged into a single integrated mechanism. The guide sliding groove is provided on the base and the cushion bracket moves along it, combining the functions of guiding movement and providing structural support, thus creating space for accommodating backrest protrusions without adding excessive moving components.
Solution Approach 2:
The guide sliding groove serves multiple functions: it guides the movement of the cushion bracket, provides structural support, and creates the necessary space between the cushion and backrest for accommodating protrusions like lumbar support. This multi-functional design achieves the space requirement without proportionally increasing device complexity.
Data Source
AI summary
Embodiments of this application disclose a seat assembly, a seat and a control method therefor, a control device, and a transportation system, and pertain to the field of mechatronics technologies. The seat includes a base, a seat cushion bracket, a backrest bracket, and a connecting rod. The backrest bracket is rotatably connected to the base. The seat cushion bracket can move relative to the base in a direction close to or away from the backrest bracket. One end of the connecting rod is rotatably connected to the seat cushion bracket at a second joint. The second joint is close to a front edge. The other end of the connecting rod is rotatably connected to the base.