Tilting Armrest Assembly With Safety Cover for Backrest Recline
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Solution Overview
Problem
Existing height adjustable armrest assemblies in chairs cause user discomfort when the backrest tilts, as the armrests are integrally assembled and cannot adjust their angle or position to match the tilting motion, leading to potential injury from gaps between components.
Innovation Solution
A height adjustable armrest assembly with a tilting arm pad that slides in the front-rear direction to match the tilting angle of the backrest, featuring a fixing bracket with a lifting part and a safety cover that links only during tilting, preventing user injury by adjusting the inclined angle and ensuring the safety cover is not interfered with during sliding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the armrest assembly is integrally assembled to the seat plate part, then the structure is simple and stable, but the user experiences discomfort when the backrest tilts because the armrest cannot adjust its angle or position
Solution Approach 1:
The armrest assembly is divided into multiple independent components: the fixing bracket part attached to the seat plate, the lifting part for height adjustment, and the tilting arm pad part for angle adjustment. This segmentation allows each part to perform its specific function independently, enabling the armrest to adapt to backrest tilting while maintaining structural simplicity.
Solution Approach 2:
The armrest assembly incorporates dynamic adjustment capabilities through the lifting part (vertical height adjustment) and the tilting arm pad part (inclined angle adjustment). These dynamic features allow the armrest to adapt to different user positions and backrest angles, resolving the contradiction between structural simplicity and user comfort during tilting.
2Ease of operation
If the armrest assembly is provided to slide in the front-rear direction during tilting, then user comfort is improved, but a gap occurs between the tilting arm pad part and fixing bracket part causing potential injury
Solution Approach 1:
The safety cover part acts as an intermediary component between the tilting arm pad part and the fixing bracket part. It covers the potential gap created during tilting movement, preventing user injury while allowing the sliding motion to occur for comfort. The safety cover is designed to move with the tilting arm pad part, maintaining coverage throughout the range of motion.
3Reliability
If the safety cover part is linked with tilting movement, then user injury is prevented, but it may interfere with sliding movement
Solution Approach 1:
The safety cover part is designed as a separate component that can be selectively linked only to the tilting movement mechanism, not to the sliding movement mechanism. This segmentation allows the safety cover to follow the tilting arm pad part during tilting (providing safety) while remaining unlinked from the sliding mechanism, thus not interfering with front-rear sliding movement.
Solution Approach 2:
The safety cover part is designed with dynamic linkage that activates only during tilting movement. It is connected to the tilting arm pad part through a mechanism that allows it to move with the tilting motion while remaining stationary or unlinked during sliding movement, thus providing safety without interfering with the sliding function.
Data Source
AI summary
A height adjustable armrest assembly includes: a fixing bracket portion having an inner space; and a lifting portion provided on top of the fixing bracket portion so as to be movable in the vertical direction. In the lifting portion, a part of a rotation lock portion that is engaged with or disengaged from the fixing bracket portion is formed to rotate toward a front side of the inner space of the fixing bracket portion, thus providing the advantage of greatly improving ease of use for a user.