Z-Shaped Cantilever Chair Frame for Lateral Rocking and Stacking
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Solution Overview
Problem
Cantilever chairs with resilient frames lack lateral mobility and are not stackable due to their U-shaped configuration, which restricts their usability and storage efficiency.
Innovation Solution
A Z-shaped frame configuration with upper, lower, and middle parts, where the middle parts connect the lower parts to the upper part at an angle, allowing for lateral movement and improved stackability by overlapping when stacked, enhancing mobility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a U-shaped frame configuration is used for cantilever chairs, then the frame provides structural support and resilience, but the chair cannot sway laterally and is not stackable
Solution Approach 1:
The frame is designed with a Z-shape configuration consisting of two lower parts, two upper parts, and two middle parts that allow controlled lateral movement. The middle parts connect the lower and upper parts at angles that enable the seat to sway side-to-side while maintaining overall structural stability, transforming the static U-shape into a dynamic structure.
Solution Approach 2:
The middle parts of the frame are positioned asymmetrically with varying distances from the upper part - closer at the front than at the rear. This asymmetric arrangement allows lateral rocking motion while maintaining forward stability, enabling the chair to sway laterally without compromising its structural integrity.
2Adaptability or versatility
If a U-shaped frame configuration is used for cantilever chairs, then the frame provides structural support, but the chair is not stackable due to frame geometry
Solution Approach 1:
The Z-shaped frame configuration with asymmetric middle part positioning creates a compact geometry that enables stacking. When two chairs are stacked, the middle parts of the upper chair fit into the spaces between the lower parts of the chair below, allowing stable vertical stacking that was not possible with the traditional U-shaped configuration.
3Ease of operation
If the middle parts of the frame are positioned close to the upper part, then lateral rocking is enabled, but the lower parts may lift off the ground
Solution Approach 1:
The middle parts of the frame are positioned at different distances from the upper part along its length - closer at the front area and farther at the rear area. This local variation in positioning allows lateral rocking motion at the front while maintaining ground contact stability at the rear, where the lower parts remain firmly planted.
Data Source
AI summary
A piece of seating furniture, particularly a chair with a resilient frame which, from the side view, is substantially configured Z-shaped and which includes an upper part of the frame, two lower parts of the frame and two middle parts of the frame, each connecting the lower part of the frame with the upper part of the frame. The middle parts of the frame each reach from the respective lower part of the frame in the rear area of a seat surface upwards at an angle to the upper part of the frame in the front area of the seat surface. The distance of the middle parts of the frame to one another at the upper part of the frame is up to a maximum of half, preferably up to a maximum of one third of the width of the seat surface in the front area. Thus, the piece of seating furniture which is particularly easy to stack, enables a large legroom for a person sitting on the piece of seating furniture and wherein the seat surface can be rocked towards the left and the right.