Adjustable Headrest Assembly With Rotation and Height Control
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Solution Overview
Problem
Conventional headrest systems in reclining furniture are not adjustable, leading to uncomfortable support positions for occupants as the chair back rotates, with the headrest either being too far back in reclined positions or too far forward in upright positions, failing to accommodate different user preferences.
Innovation Solution
A headrest assembly system with a movable headrest portion connected to a back support via armrests, featuring a first adjustment member for rotational movement and a second adjustment member for vertical adjustment, allowing occupants to manually adjust the headrest's position between rearward and forward rotations, as well as upward and downward extensions, using lever mechanisms and cables within a cavity between armrest frame elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the headrest support is fixed to the back seat member, then the structure is simple and stable, but the headrest position becomes uncomfortable in different rotated positions and cannot accommodate different occupants
Solution Approach 1:
The headrest assembly is transformed from a fixed structure to a dynamic, adjustable one. The headrest portion is made movable relative to the back support portion through a mechanism involving a movable connection, allowing it to change position in response to different backrest angles and occupant needs, thereby resolving the contradiction between simplicity and adaptability.
Solution Approach 2:
The headrest assembly is divided into separate functional components: a headrest portion, a back support portion, and adjustment mechanisms. This segmentation allows independent adjustment of each component, enabling the headrest to adapt to different positions without requiring complete structural redesign, thus balancing adaptability with manageable complexity.
2Ease of operation
If the headrest remains in fixed orientation with respect to the seat back member, then the manufacturing is simple, but the headrest is too far back in fully reclined position and too far forward in fully upright position
Solution Approach 1:
The headrest adjustment mechanism is designed to be manually operable by the occupant without requiring external assistance or complex electronic controls. The movable connection allows the occupant to directly adjust the headrest position to suit their needs, achieving ease of operation while keeping the mechanism relatively simple.
3Adaptability or versatility
If the headrest cushion remains fixed during back seat rotation, then the structure is stable and simple, but the headrest support position becomes uncomfortable for different occupants and positions
Solution Approach 1:
The headrest cushion is made dynamic through the movable connection, allowing it to change its position relative to the back support portion. This enables the headrest to maintain comfortable support positions across different backrest rotation angles and for different occupants, achieving adaptability while the movable connection design keeps the complexity manageable.
Data Source
AI summary
A system for moving a furniture member headrest includes an armrest fixedly connected to a base. A back support is connected to the armrest. A headrest is movably connected to the back support. A first adjustment member operates to rotate the headrest. The first adjustment member is positioned in a cavity between interior and exterior armrest frame elements and is manually movable. A second adjustment member moves the headrest upwardly or downwardly with respect to the backrest. The second adjustment member is also positioned in the cavity and manually movable by the occupant.