Folding Chair Backrest Frame and Ganging for Curved Rows
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Solution Overview
Problem
Conventional folding chairs suffer from insecure connections between the backrest and front leg frame, leading to deformation and loose attachments, and ganging devices that restrict spacing and alignment in straight rows, causing discomfort and neck strain in large events.
Innovation Solution
A folding super chair design featuring a backrest frame with an L-shaped cross section and dome-shaped contour, spot-welded to the front leg frame, and a ganging device with angled side faces to maintain secure connections and allow curved row arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a thin metal strip connection ridge is used to connect the backrest to the front leg frame, then the structure is simple and easy to manufacture, but the connection becomes insecure and deforms under stress over time
Solution Approach 1:
The connection structure is divided into multiple components: the connection ridge, the reinforcing plate, and the front leg frame with positioning holes. The reinforcing plate acts as a separate structural element that segments the stress distribution, preventing the thin connection ridge from bearing all the load alone. This segmentation maintains manufacturing simplicity while significantly improving connection reliability.
Solution Approach 2:
The connection structure combines the thin metal strip connection ridge with a thicker reinforcing plate made of similar material. This composite structure allows the thin ridge to maintain ease of manufacture while the thicker reinforcing plate provides the necessary structural strength and reliability to prevent deformation under stress.
2Ease of operation
If conventional ganging devices with L-bars and loops are used to connect chairs, then chairs can be connected side by side, but the gap between chairs is small causing discomfort and the arrangement is restricted to straight lines
Solution Approach 1:
The ganging device incorporates an arc-shaped connection surface that allows chairs to be arranged in curved rows rather than only straight lines. This curvature enables the chairs to form a semi-circular or arc-shaped configuration, providing better viewing angles for attendees while maintaining comfortable spacing between chairs. The arc-shaped design directly addresses both the comfort and flexibility requirements.
Solution Approach 2:
The ganging device uses a movable connection mechanism with the arc-shaped surface that allows for dynamic adjustment of chair spacing and arrangement. The connection structure can accommodate variations in spacing while maintaining stability, enabling both comfortable seating gaps and flexible curved row configurations. This dynamic capability allows the same device to satisfy both comfort and adaptability needs.
Data Source
AI summary
A folding super chair includes a front leg frame, a backrest, a backrest frame and a ganging device. The backrest frame has a contour corresponding to an upper inner portion of the front leg frame and an L-shaped cross section. The backrest frame is disposed between the front leg frame and the backrest. The backrest is placed on the backrest frame, which relieve stress. Thus, a ridge of the backrest does not deform, and the backrest is securely fixed on the folding super chair. The ganging device includes a main member, a slot fastener and a knob fastener. The main member has a front face, a rear face and two side faces. The rear face is larger than the front face, and therefore the two side faces form an included angle therebetween. When the folding super chairs are lined up and connected by the ganging device, the folding super chairs form a curved row.