Adjustable Chair Hinge With Moving Pivot for Stable Support Positioning
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Solution Overview
Problem
Existing adjustable chair constructions often fail to accommodate the unique needs of handicapped users, particularly in terms of adjustability and comfort, as they typically only allow adjustment of one or a few features, leading to displacement of additional supports during reclining, and require costly custom-made solutions that become obsolete as users grow.
Innovation Solution
An adjustable chair construction with a hinge mechanism linking the backrest and seat, featuring interlocking teeth on curved or linear top sections and a pivotable connecting member, allowing the pivot point to translate with the user's movement, along with adjustable width, length, and angulation capabilities, ensuring that additional supports remain optimally positioned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional fixed pivot point hinge construction is used, then the backrest can be reclined, but the additional supports (side supports, back supports, chest supports) are displaced from their optimal positions
Solution Approach 1:
The patent applies the dynamics principle by making the pivot point movable rather than fixed. The connecting member with curved or linear top section allows the pivot point to translate horizontally as the backrest reclines, dynamically adapting to the user's back movement. This resolves the contradiction by enabling reclining motion while maintaining accurate support positioning throughout the range of motion.
Solution Approach 2:
The connecting member acts as an intermediary between the seat and backrest, mediating the motion transmission. Through its curved or linear top section with meshed teeth, it translates the reclining motion into horizontal displacement of the pivot point, thereby maintaining the optimal positioning of additional supports while enabling backrest adjustment.
2Adaptability or versatility
If custom-made chair constructions are produced for each handicapped user, then the chair can be perfectly adjusted to the user's needs, but the cost and resource demand increase significantly
Solution Approach 1:
The patent applies universality by designing a standardized chair construction with adjustable features that can accommodate multiple users with different needs. The hinge construction with movable pivot point, adjustable seat width, and configurable additional supports creates a universal platform that can be adapted to various handicapped users without requiring custom-made solutions for each individual.
Solution Approach 2:
The adjustable features including seat width, backrest angle, and additional support positions enable the chair to dynamically adapt to different user requirements. This maintains high adaptability while using standardized components, reducing production costs compared to fully custom-made constructions.
3Manufacturing precision
If one-off special constructions are made for children, then the chair fits the child's current size, but as the child grows the chair becomes a compromise and requires further custom construction
Solution Approach 1:
The patent applies dynamics by making the chair construction adjustable rather than fixed. The movable pivot point hinge, adjustable seat dimensions, and reconfigurable additional supports allow the chair to adapt as the child grows. This maintains precise fit initially while providing long-term adaptability, eliminating the need for frequent custom reconstructions.
Solution Approach 2:
The chair is segmented into adjustable components (seat, backrest, additional supports) that can be independently configured. This segmentation allows the chair to grow with the child by adjusting individual components rather than requiring complete reconstruction, maintaining both initial precision and long-term adaptability.
4Device complexity
If the backrest pivot point is fixed in traditional constructions, then the hinge construction is simple, but the pivot point does not follow the actual movement of the user's back during reclining
Solution Approach 1:
The patent resolves this contradiction by making the pivot point dynamic rather than static. The connecting member with curved or linear top section enables the pivot point to translate horizontally during reclining, following the natural movement of the user's back. This increases device complexity slightly but dramatically improves the anatomical accuracy of the backrest movement.
Data Source
AI summary
An adjustable chair construction is described which is particular in that the backrest is linked to the seat by means of at least one hinge construction, where said hinge construction on the seat comprises at least one first projecting member (23) having a curved or linear top section on which top section teeth are arranged, and on the back rest at least one second projecting member (82) having a curved or linear top section on which top section teeth are arranged, such that the teeth on one section mesh with the teeth on the other section, and that at least one connecting member (100) being pivotable fastened to the first and second projecting members (23, 82) maintains the teeth of the curved sections in meshed relationship.