Chair Upholstery Assembly Using Drawstring Alignment Features
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Solution Overview
Problem
Existing chair assemblies face challenges in efficiently aligning and securing upholstery covers over complex back structures, particularly in ensuring proper alignment and stability across the width of the chair, which affects user comfort and aesthetics.
Innovation Solution
A method involving a drawstring mechanism operably coupled with the cover member, which is aligned with raised portions on the chair member to secure the cover using fasteners within these raised features, allowing for lateral alignment and tensioning to maintain the upholstery's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cover member is wrapped about a complex back structure, then the upholstery can be secured to the chair member, but it becomes difficult to achieve proper alignment and stable attachment across the width of the chair
Solution Approach 1:
The invention divides the attachment system into multiple independent attachment features distributed across the width of the chair member. Each attachment feature includes a raised portion on the chair member and a corresponding recess in the cover member, allowing independent alignment and attachment at multiple locations. This segmentation enables the operator to align and secure the cover at discrete points across the width, ensuring both proper alignment and stable attachment without the difficulty of aligning a single continuous attachment system.
Solution Approach 2:
The raised portions on the chair member and corresponding recesses in the cover member are pre-formed during manufacturing, establishing alignment references before the assembly process. These pre-formed features guide the operator in properly positioning the cover member relative to the chair member, eliminating the need for complex alignment procedures during assembly. The preliminary formation of these alignment features ensures that when the cover is wrapped and tensioned, it naturally aligns with the raised portions for secure attachment.
2Reliability
If the cover member is tensioned to maintain position, then attachment stability is improved, but the complexity of the securing mechanism increases
Solution Approach 1:
The drawstring mechanism operates on a self-service principle where the operator simply pulls the drawstring to tension the cover member and maintain its position. The tensioning action is self-regulating, allowing the operator to achieve the desired fit by pulling the drawstring until the cover is properly tensioned against the chair member. This simple self-service mechanism eliminates the need for complex fastening systems with multiple components, adjustment mechanisms, or specialized tools, while still providing reliable cover position stability through continuous tension.
Solution Approach 2:
The cover member is constructed as a flexible fabric or thin film material that can be tensioned and conform to the contours of the chair member. This flexibility allows the cover to maintain its position through tension alone, without requiring rigid structural supports or complex mechanical fastening systems. The flexible nature of the cover material enables it to be securely held by the drawstring tension while accommodating the complex back structure, achieving position stability with minimal mechanism complexity.
Data Source
AI summary
A method of assembling a chair component includes providing a first chair member adapted to support a user and that includes forwardly and a rearwardly-facing surfaced, wherein the first chair member further includes at least one raised portion extending rearwardly from the rear surface, wrapping a cover member about a portion of the first chair member, providing a drawstring operably coupled with the cover member, drawing the cover member about the portion of the first chair member by the drawstring, aligning the cover with the at least one raised portion to properly align the cover with respect to the first chair member, and securing the drawstring to the first chair member with at least one fastener that is received within the at least one raised portion.