Car Seat Armrest Cam Linkage Reduces Adjustment Force
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Solution Overview
Problem
Conventional armrests for car seats require significant force to adjust the armrest's angle due to the alignment of the axis of rotation and cam, limiting the ease of multistage rotation and comfort for passengers.
Innovation Solution
The armrest design features a connection bracket, a rest body, and a cam system with a two-bar link structure, where the axis of rotation of the rest body and cam are positioned differently, allowing for reduced operation force through indirect driving and increased armrest length via rotational position adjustment, enabling smooth rotation from a horizontal to a downwardly inclined state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the axis of rotation of the rest body and the axis of rotation of the cam are aligned, then the structure is simple, but the force required to adjust multistage rotation is large
Solution Approach 1:
The patent relocates the cam's axis of rotation from the same position as the rest body's axis to a different position in space, creating a two-bar link structure. This spatial reconfiguration changes the force transmission path and reduces the adjustment force required while maintaining structural feasibility
2Force
If the cam has a two-bar link structure with separated axes of rotation, then the operation force is reduced, but the device complexity increases
Solution Approach 1:
The cam is designed with a two-bar link structure that enables multistage rotation through dynamic geometric transformation. The first and second coupling portions form a variable geometry mechanism that adapts its configuration during rotation, allowing force reduction while achieving multiple rotation stages
3Length of moving object
If the armrest length is increased for better comfort, then the space utilization improves, but the rotation adjustment becomes more difficult
Solution Approach 1:
The cam acts as an intermediary mechanism between the gas cylinder and the rest body. Through its two-bar link structure with first and second coupling portions, it provides mechanical advantage that reduces the force needed to rotate the longer armrest, mediating between the actuator and the load
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 design reduces the force needed for multistage rotation, enhances comfort by allowing the armrest to be adjusted to various angles, and increases the armrest's length, improving passenger convenience and space utilization.
Implementation Method 1
a gas cylinder connected to the third cam, the gas cylinder being configured to be extended and contracted in a longitudinal direction
Data Source
AI summary
The present disclosure relates to an armrest for car seats including a connection bracket coupled to a car seat, a rest body connected to the connection bracket so as to be turnable about a fourth axis of rotation, a third cam connected to the rest body so as to be turnable about the fourth axis of rotation, a gas cylinder connected to the third cam, the gas cylinder being configured to be extended and contracted in a longitudinal direction, and a manipulation button installed at the rest body, the manipulation button being configured to manipulate the gas cylinder.