Chair Upholstery Drawstring Assembly for Recline Alignment
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Solution Overview
Problem
Existing chair designs lack efficient mechanisms for adjusting and securing upholstery, particularly in office chairs, which affects user comfort and aesthetics as the chair components move between upright and reclined positions.
Innovation Solution
A chair assembly featuring a single-piece drawstring operably coupled with a cover member to securely wrap around chair components, adjusting and aligning with raised portions for secure fastening, ensuring proper alignment and tension throughout the upholstery arrangement as the chair moves between positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a traditional upholstery securing mechanism is used, then the upholstery can be attached to the chair frame, but the upholstery becomes misaligned and loose when the chair moves between upright and reclined positions
Solution Approach 1:
The drawstring mechanism is made adjustable and dynamic, allowing it to change tension and configuration as the chair moves between upright and reclined positions. The drawstring can be tightened or loosened to maintain upholstery alignment across different chair positions, transforming a static securing system into an adaptive one that responds to position changes.
Solution Approach 2:
The tension parameter of the drawstring is changed adaptively to maintain upholstery alignment. By adjusting the drawstring tension according to the chair's position (upright vs. reclined), the system compensates for the changing geometric relationships between the upholstery and chair frame, keeping the upholstery properly aligned throughout the range of motion.
2Stability of the object's composition
If multiple separate drawstrings are used to secure upholstery on different chair components, then each component can be adjusted independently, but the overall upholstery appearance becomes uneven and misaligned
Solution Approach 1:
Multiple separate drawstrings are merged into a single continuous drawstring that passes through or around multiple chair components (seat, backrest, armrests). This unified drawstring system allows for coordinated adjustment of all components simultaneously, ensuring even upholstery distribution and alignment across the entire chair while reducing the number of separate adjustment mechanisms needed.
3Stability of the object's composition
If the upholstery is tightly secured in the upright position, then the upholstery remains aligned when upright, but the upholstery becomes overly tense and distorted when the chair is reclined
Solution Approach 1:
The drawstring tension is made dynamic rather than fixed, allowing it to be adjusted according to the chair's position. When the chair is upright, the drawstring can be tightened to secure the upholstery; when the chair is reclined, the drawstring tension can be reduced to prevent distortion. This dynamic adjustment capability allows the same securing mechanism to adapt to different positional requirements.
Data Source
AI summary
A chair component includes a first chair member adapted to support a seated user, a second chair member movable between a first position, wherein the second chair member is substantially coplanar with the first chair member, and a second position, wherein the second chair member is substantially parallel with the first chair member, a cover member wrapped about at least a portion of the first chair member and at least a portion of the second chair member, and a single-piece drawstring operably coupled with the cover member to draw the cover member about the at least a portion of the first chair member and the at least a portion of the second chair member when the second chair member is in the first position.