Seat Lifter with Planetary Gears for Synchronized Frame Motion
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Solution Overview
Problem
Existing seat lifters face difficulties in smoothly lifting and lowering both right and left seat frames due to inadequate mechanisms, leading to inefficient seat adjustment.
Innovation Solution
A seat lifter design featuring first and second links rotatably coupled to base and seat frames, respectively, with interlocking planetary gear groups and sun gears, allowing synchronized lifting and lowering of both seat frames through a dual mechanism system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only one lifting and lowering mechanism section is used to control one seat frame, then the mechanism structure is simplified, but the other seat frame cannot be adequately lifted and lowered
Solution Approach 1:
The patent combines two lifting and lowering mechanism sections into a single integrated system where the first mechanism section controls the first seat frame and the second mechanism section controls the second seat frame, with both sections working in coordination to achieve reliable lifting and lowering of both seat frames simultaneously
2Device complexity
If a single mechanism lifts one seat frame while the other is pushed by shaft movement, then the mechanism is simpler, but smooth lifting and lowering of both seat frames is difficult to achieve
Solution Approach 1:
The patent merges two independent lifting and lowering mechanism sections that work in parallel, with each mechanism section dedicated to one seat frame, ensuring that both seat frames can be lifted and lowered smoothly and independently without interference from shaft movement
Solution Approach 2:
The patent segments the lifting and lowering function into two separate mechanism sections, with the first mechanism section dedicated to the first seat frame and the second mechanism section dedicated to the second seat frame, allowing each segment to operate optimally for its specific function
3Reliability
If complex internal gear arrangements are used to lift and lower both seat frames, then both seat frames can be controlled, but the seat frame size and weight increase
Solution Approach 1:
The patent segments the control system into two separate lifting and lowering mechanism sections, each with its own drive system, eliminating the need for complex internal gear arrangements that would be required to control both seat frames with a single mechanism, thereby reducing overall weight
Solution Approach 2:
The patent uses identical or similar lifting and lowering mechanism sections for both seat frames, copying the successful single-seat-frame mechanism design to control both frames independently, avoiding the need for complex differentiated gear arrangements
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
Enables smooth and synchronized lifting and lowering of both seat frames, reducing the risk of mechanical inefficiencies and enhancing user experience by eliminating the need for complex internal gear arrangements, while also downsizing the seat frame and reducing weight.
Implementation Method 1
a first planetary gear group (40) having a plurality of first planetary gears (44) which are respectively meshed with the first sun gear (62)
Implementation Method 2
a first sun gear (62) and a first planetary gear group (40) to lift and lower the first seat frame (3a) with respect to the first base member (2a)
Data Source
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AI summary
It is an object of the present invention to provide a seat lifter capable of smoothly lifting and lowering both right and left seat frames with respect to respective base members so as to allow a seat to be smoothly lifted and lowered, and a seat having the seat lifter. The seat lifter of the present invention comprises first to fourth link members (4a to 4d), and a coupling member (6) which couples the first link member (4a) and the second link member (4b), and has a first sun gear (62) and a second sun gear (162). The first link member (4a) has a first link body (41) which is interlockably coupled to a first planetary gear group (40) having a plurality of first planetary gears (44), and a planetary-gear operating section (5). The second link member (4b) has a second link body (141) which is interlockably coupled to a second planetary gear group (140) having a plurality of second planetary gears (144).