Ratcheting Armrest Assembly with Directional Spring Locking
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Solution Overview
Problem
Adjusting vehicle armrests is often cumbersome, discouraging occupants from making proper adjustments for comfort, as existing mechanisms are not user-friendly.
Innovation Solution
A ratcheting armrest assembly with an articulating frame, locking mechanism, and directional spring that allows for easy angular adjustment and self-locking in desired positions, enabling comfortable positioning without requiring excessive effort.
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 requires excessive effort
Solution Approach 1:
The armrest assembly incorporates a ratcheting mechanism that allows dynamic adjustment in one direction (toward the user) while providing automatic locking in the opposite direction. The spring-loaded pawl and ratchet teeth enable the armrest to move freely during adjustment but lock securely when positioned, transforming a bidirectional mechanical joint into a unidirectional adjustable system with automatic positioning.
Solution Approach 2:
The ratcheting mechanism with spring-loaded pawl automatically locks the armrest in place without requiring user intervention. When the armrest is pushed toward the user, the pawl disengages from the ratchet teeth, allowing movement. When pushed away, the spring forces the pawl into engagement with the teeth, automatically locking the position and eliminating the need for manual locking or excessive force to maintain position.
2Adaptability or versatility
If the armrest is made pivotably adjustable for comfort, then user comfort is improved, but the adjustment mechanism becomes complex and difficult to operate
Solution Approach 1:
The pivot joint connecting the armrest to the seat is enhanced with a ratcheting mechanism that provides dynamic adjustability. The armrest can be freely pivoted toward the user for adjustment, and the spring-loaded pawl automatically engages with ratchet teeth to lock the position. This transforms a simple pivot joint into an intelligently controlled mechanism that provides adaptability without complex controls or multiple components.
3Ease of operation
If the armrest adjustment mechanism allows easy movement, then ease of operation is improved, but the armrest may not remain securely locked in position
Solution Approach 1:
The spring-loaded pawl automatically engages with the ratchet teeth to lock the armrest in position without requiring user intervention. The spring maintains constant force on the pawl, ensuring reliable engagement with the teeth. When the armrest is pushed toward the user during adjustment, the pawl lifts off the teeth and allows movement; when pushed away, the spring automatically forces the pawl back into engagement, providing secure locking that maintains reliability while preserving ease of adjustment.
Solution Approach 2:
The locking function is extracted as a separate mechanism (ratchet teeth and pawl) from the pivot joint itself. The ratchet teeth are formed on the armrest or its mounting structure, and the pawl is a distinct component that engages with these teeth. This separation allows the locking function to operate independently from the adjustment motion, providing reliable positioning without interfering with the ease of movement during adjustment.
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
Facilitates effortless adjustment and secure locking of the armrest in optimal positions, enhancing user comfort and perceived vehicle quality by simplifying the adjustment process.
Implementation Method 1
A directional spring is operatively coupled to the ratchet and biases the ratchet in engagement with the ratchet anchor
Implementation Method 2
A ratchet is fixed to the anchor assembly and arranged such that the ratchet selectively locks the armrest assembly in different rotational positions
Data Source
Figure 1
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AI summary
A ratcheting armrest assembly (10) includes an articulating frame assembly (12). Also included is a ratchet anchor (52) operatively coupled to the articulating frame assembly for rotation with the articulating frame assembly. Further included is an anchor assembly (22) operatively coupled to the articulating frame assembly. Yet further included is a ratchet (38) operatively coupled to the anchor assembly. The ratchet includes a first plurality of teeth (54) and the ratchet anchor including a second plurality of teeth (56), 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 (60) biasing the ratchet in the second direction in a first orientation and in the first direction in a second orientation.