Armrest Rotating Structure for Quiet Secure Angle Positioning
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Solution Overview
Problem
Conventional armrests lack angular adjustment capabilities and often produce noise during operation due to the existing angular adjusting structures.
Innovation Solution
A rotating structure for armrests featuring a rotary plate with a pivotal member, a slidable retaining tab biased by a spring, and toothed recesses and protrusions for secure and quiet angular adjustment, allowing quick and secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a biasing member (such as a biasing ball) is used to generate engaging force for angular adjustment, then the armrest can achieve angular adjustment capability, but considerable noise is made during operation
Solution Approach 1:
The patent replaces the conventional biasing ball mechanical system with a spring-loaded retaining tab system that uses elastic deformation of the spring to provide engaging force. The retaining tab engages with toothed recesses in a controlled manner, substituting the noisy ball-and-socket engagement with a quieter tab-to-tooth engagement mechanism that maintains angular adjustment capability while reducing noise.
Solution Approach 2:
The patent introduces a retaining tab as an intermediary element between the biasing spring and the toothed recesses. This retaining tab acts as a mediator that transfers the engaging force from the spring to the positioning mechanism, enabling controlled engagement and disengagement that reduces noise compared to direct ball-to-surface contact.
2Adaptability or versatility
If a conventional angular adjusting structure is used, then angular adjustment is achieved, but the positioning is not quick or secure
Solution Approach 1:
The patent segments the continuous rotation capability into discrete angular positions by providing multiple toothed recesses around the receiving chamber. Each toothed recess represents a discrete positioning station, allowing the armrest to be adjusted to specific angles rather than continuous rotation, which provides secure and quick positioning at predetermined angles.
Solution Approach 2:
The patent creates a dynamic engagement system where the retaining tab can be pressed to disengage from the toothed recesses, allowing rotation, and then automatically engages with the nearest toothed recess to provide secure positioning. This dynamic engagement-disengagement mechanism enables quick adjustment to multiple positions while maintaining security at each position.
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 quick and secure angular adjustment of armrests without noise, ensuring user comfort and reducing operational noise.
Implementation Method 1
a cutout 24 fixed on one side thereof for receiving a slidable retaining tab 22 which is biased by a spring 23
Data Source
AI summary
A rotating structure for armrests includes a rotary plate disposed onto a support mounted to a holder extending upwardly on each of two sides of a chair. The support includes a receiving chamber formed on the top surface thereof and having a plurality of toothed recesses arranged around the external rim thereof. The rotary plate includes a pivotal member extending therefrom corresponding to the support and having a cutout fixed on one side thereof for receiving a slidable retaining tab which is biased by a spring. The retaining tab includes a number of toothed protrusions attached thereon and engaging with the toothed recesses. The bottom of a holding panel for placing a user's elbow may be assembled with the rotary plate, thereby obtaining a quick and secure positioning purpose and preventing making noise while in operation.