Ratcheting armrest assembly for a vehicle
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Adjusting vehicle armrests is often cumbersome, discouraging occupants from making proper adjustments for comfort, as existing mechanisms lack efficient and user-friendly locking and unlocking features.
Innovation Solution
A ratcheting armrest assembly with an articulating frame, a ratchet anchor, and a directional spring, allowing for easy adjustment by self-locking in one direction and free rotation in the other, using interlocking teeth and a spring biasing mechanism for smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional armrest adjustment mechanism is used, then the armrest can be adjusted to different positions, but the adjustment process is cumbersome and difficult to operate
Solution Approach 1:
The adjustment mechanism is segmented into distinct functional components: a ratchet component with teeth for locking, a pawl component for engagement, and a directional spring for automated operation. This segmentation allows each component to perform its specific function efficiently, making the overall system easier to operate while maintaining manageable complexity
Solution Approach 2:
The directional spring provides self-service functionality by automatically returning the pawl to its engagement position with the ratchet teeth after the armrest is adjusted. This eliminates the need for manual resetting or complex control mechanisms, significantly improving ease of operation while keeping the device complexity low
2Reliability
If a secure locking mechanism is implemented to hold armrest position, then the armrest remains stable in desired position, but the mechanism becomes more complex and harder to adjust
Solution Approach 1:
The traditional complex mechanical locking system is replaced with a simplified ratchet-and-pawl mechanism driven by a directional spring. This substitution provides reliable position holding through the interlocking teeth while the spring automatically manages the engagement/disengagement cycle, making adjustment as easy as moving the armrest to the desired position
Solution Approach 2:
The ratchet teeth are designed with asymmetric geometry that allows free movement in one direction (adjustment) while providing secure locking in the opposite direction (position holding). This asymmetric design inherently combines reliability with ease of operation, as the armrest can be freely adjusted but locks securely in place
3Ease of operation
If a simple rotation mechanism is used, then the armrest can be freely adjusted, but it cannot maintain position without additional locking components
Solution Approach 1:
The locking function is merged with the rotation mechanism itself through the ratchet teeth integrated into the rotating component. The pawl and directional spring are combined to form an automatic locking system that activates during rotation, eliminating the need for separate locking mechanisms and reducing overall device complexity
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 effortless and precise adjustment of armrests, enhancing user comfort and perception of vehicle quality by simplifying the adjustment process while maintaining secure locking in desired positions.
Implementation Method 1
a directional spring biasing the ratchet in the second direction in a first orientation and in the first direction in a second orientation
Data Source
AI summary
A ratcheting armrest assembly includes an articulating frame assembly. Also included is a ratchet anchor operatively coupled to the articulating frame assembly for rotation with the articulating frame assembly. Further included is an anchor assembly operatively coupled to the articulating frame assembly. Yet further included is a ratchet operatively coupled to the anchor assembly. The ratchet includes a first plurality of teeth and the ratchet anchor including a second plurality of teeth, wherein the first plurality of teeth and the second plurality of teeth are engageable with each other, the second plurality of teeth free to rotate relative to the first plurality of teeth in a first rotational direction and self-locking with the first plurality of teeth in a second rotational direction. Also included is a directional spring biasing the ratchet in the second direction in a first orientation and in the first direction in a second orientation.