Reclining Chair Backrest With Raised Shoulder and Head Support
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Solution Overview
Problem
Existing chairs lack improved ergonomic support for the shoulder and head area when the backrest is reclined, failing to provide adequate support and comfort.
Innovation Solution
A chair design featuring a synchronized backrest and seat mechanism with an elastically deformable backrest part that pivots, incorporating a back panel with a head restraint and lumbar support, utilizing pivot shafts and docking parts to adjust and provide enhanced support through elastic deformation, and a spring subassembly to maintain the upright position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the backrest is designed to pivot from upright to reclined position, then the chair provides reclining functionality, but the support for shoulder area and head deteriorates in reclined position
Solution Approach 1:
The backrest is divided into multiple segments: a rigid backrest frame, an elastically deformable backrest part, and a separately adjustable head restraint. This segmentation allows each part to perform its specific function - the rigid frame provides structural support while the elastic part deforms to maintain contact with the user's back during reclining, and the head restraint can be independently positioned to support the head in any recline angle.
Solution Approach 2:
The backrest part is designed to be elastically deformable rather than rigid, allowing it to dynamically adapt its shape during reclining. The elastic deformation enables the backrest part to follow the user's back contour changes while maintaining continuous contact and support throughout the reclining motion.
2Reliability
If the backrest part is made elastically deformable to improve back support, then the ergonomic function is enhanced, but the structural complexity increases
Solution Approach 1:
The backrest part utilizes an elastic shell or film structure that can deform conformally with the user's back. This flexible structure provides ergonomic adaptation without requiring complex mechanical mechanisms, achieving elastic deformation through material properties rather than complex linkages or actuators.
3Adaptability or versatility
If the head restraint is separated from the back panel and made adjustable, then the head support adaptability is improved, but the device complexity increases
Solution Approach 1:
The head restraint is completely separated from the back panel and implemented as an independent component that can be freely positioned and adjusted. This segmentation allows the head restraint to be optimally positioned for any recline angle without being constrained by the back panel structure, maximizing adaptability.
Solution Approach 2:
The head restraint is designed as a universal component that can function effectively in both upright and reclined positions. Its independent mounting system allows it to serve multiple functions: supporting the head in various angles, providing lateral support, and adapting to different user preferences without requiring separate mechanisms for different positions.
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
The design enhances ergonomic support by providing improved shoulder and head support when reclined, allowing for comfortable adjustment and maintaining the upright position through pretensioning, thus improving user comfort and ergonomic functionality.
Implementation Method 1
the application of a force in the direction of the reclined position having in principle a concave tendency to the back of the user, means are provided for an opposing raising of the shoulder area
Data Source
AI summary
The chair has a sub frame (1) set on the floor, a mechanism (2) set on the sub frame, a seat (3) set on the mechanism (2) and a backrest (7) attached to the mechanism (2). The backrest (7) exhibits a backrest frame (5), which supports an elastically deformable backrest part (6) with a back panel (62). The back panel (62) has a back part (60), to which a head restraint (61) is attached. The backrest (7) is capable of pivoting about a first pivot shaft (D1) from an essentially upright, neutral position to a reclined position displaced towards the rear. The movements of the seat (3) and the backrest (7) are synchronized with one another. In the event of the elastic deformation of the back part (60) into a free space for the backrest frame (5), by the application of a force in the direction of the reclined position having an essentially concave tendency to the back of the user, means (53,67,D4;55,610,D5) are provided for an opposing raising of the shoulder area, as a transitional zone of the back part (60) for the head restraint (61), and of the head restraint (61).