Stackable chair
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Solution Overview
Problem
Existing stacking chairs often suffer from damage due to frame-to-frame contact during stacking, get stuck together due to concentrated weight, and lack tilting functionality, which limits space efficiency and comfort.
Innovation Solution
A chair design featuring a rotating seating portion and backrest with matching profiles that distribute weight across large surfaces, reducing contact force and allowing for tilting, combined with injection molded foam for comfort and structural rigidity, enabling easy stacking and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chairs are designed for frame-to-frame contact to avoid surface-to-surface contact of upholstered seats, then chairs can be stacked stably, but the contact area is small causing concentrated weight that makes chairs stick together or become difficult to remove
Solution Approach 1:
The chair design features nested curved surfaces where the bottom surface of the seat and the top surface of the backrest are shaped to nest within each other when stacked. This nesting configuration increases the contact area between chairs, distributing weight more evenly and preventing chairs from sticking together while maintaining stacking stability.
2Ease of operation
If padding is added to increase comfort, then seating comfort is improved, but the chair occupies more space reducing the number of chairs that can be stacked within typical door heights
Solution Approach 1:
The nested curved surfaces design allows the padded seat and backrest to interlock efficiently when stacked, maximizing space utilization. The curvature enables each chair to nest partially within the previous chair, reducing the overall stacking height and allowing more padded chairs to fit within standard door heights while maintaining comfort.
Solution Approach 2:
The chair incorporates a tilting mechanism that allows the seat to rotate more than 90 degrees relative to the backrest. This angular adjustment capability provides an additional dimension for space optimization, enabling chairs to be positioned at optimal angles for both comfort and compact stacking arrangements.
3Ease of manufacture
If the seating surface is made stationary to simplify structure, then manufacturing is easier, but the chair cannot tilt to optimize space in aisles and between rows
Solution Approach 1:
The chair features a dynamic tilting mechanism where the seat can rotate more than 90 degrees relative to the backrest. This dynamic capability allows the seating surface to adjust its angle, optimizing space utilization in aisle configurations and between rows while maintaining relatively simple construction through the use of curved surfaces and nested profiles.
Data Source
AI summary
A stacking chair with a frame connected to a rotating seating portion and backrest portion each of the seating portion and backrest portion having matching profiles such that when stacked the weight of the chairs is distributed across facing surfaces that nest together due to matching profiles, the seating portion may rotate through an angle of rotation greater than 90 degrees and the seating and/or backrest portions may include a injection molded foam interior surrounding an internal frame and with a removable cover on the outside of the foam.