Pivoting Adjustable-Height Chair Structure for Simple Stackable Seating
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Solution Overview
Problem
Existing adjustable height furniture, particularly chairs, are complex in construction, costly to manufacture, and lack features like simplicity, lightweight design, ease of height adjustment, and stackability.
Innovation Solution
The design features a first frame with two platforms secured at an angle, pivotably attached to second frames with cross members that support the platforms, allowing height adjustment by rotating the frames, and includes side frames that angle inward for stackability, with various shapes like Z, Y, X, and rectangular designs for structural strength and aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional adjustable height furniture is designed with multiple mechanisms and components, then height adjustment capability is achieved, but construction complexity and manufacturing cost increase
Solution Approach 1:
The chair is divided into distinct functional modules: a base assembly with cross members, a seat assembly with platforms, and connecting mechanisms. This segmentation allows each component to be manufactured independently and assembled systematically, reducing overall construction complexity while maintaining height adjustment functionality through modular reconfiguration.
Solution Approach 2:
The cross members serve multiple functions: they provide structural support for the platforms, act as pivot points for height adjustment, and function as stacking interfaces when the chair is not in use. This multi-functionality eliminates the need for separate components, simplifying construction while preserving adaptability.
2Strength
If traditional adjustable height furniture includes robust support structures, then structural strength is maintained, but weight increases
Solution Approach 1:
The side frames incorporate curved and angled geometries rather than purely straight rigid members. These curved configurations provide structural strength through geometric distribution of forces while using less material, thereby reducing weight without compromising load-bearing capacity.
Solution Approach 2:
The chair employs composite construction combining wood or wood-like materials with metal hardware components. This composite approach optimizes the weight-to-strength ratio by using lightweight materials where possible and reinforcing only critical stress points with stronger but heavier materials.
3Ease of manufacture
If traditional chairs have fixed leg structures, then manufacturing is simplified, but stackability is reduced
Solution Approach 1:
The leg structures are designed with adjustable angles and positions that can be configured for different functions. When stacked, the legs angle inward to nest efficiently; when in use, they extend outward for stability. This dynamic reconfiguration capability is built into the basic manufacturing design, maintaining ease of production while enabling stackability.
Solution Approach 2:
The chair legs are specifically shaped and angled to allow nested stacking, where the legs of one chair fit within the leg structure of another. This nesting capability is achieved through the geometric design of the leg members themselves, requiring no additional components and maintaining manufacturing simplicity.
Data Source
AI summary
An adjustable height chair has a pair of side frames and a seat frame with two seat/backrest portions secured together, with the seat frame pivotably mounted in the side frames. The chair height is changed by rotating the side frames in a direction opposite to the rotation of the seat frame, so that a seat panel which previously served as a platform to sit on becomes a backrest, and vice-versa. The chair preferably has one or more crossbars to serve the double duty of strengthening the frame of the chair, and supporting the seat panels in both sitting positions of the chair.