Chair for user sitting
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Solution Overview
Problem
Existing chairs are costly, complex to produce and assemble, lack ergonomic comfort, and do not meet legal requirements for seat tilting, while being aesthetically unpleasing.
Innovation Solution
A chair design featuring a single-body structure with a hinged back and seat connected by elastic return means, allowing the seat to translate and rotate, and incorporating adjustable height and aesthetically pleasing design elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If chairs are formed by multiple separate elements that are assembled together, then ergonomic comfort and professional usability are improved, but manufacturing complexity and assembly complexity increase significantly
Solution Approach 1:
The patent merges the seat and backrest into a single integrated shell structure made of plastic, eliminating the need for multiple separate elements. This unibody design maintains ergonomic comfort while dramatically simplifying manufacturing and assembly, as the entire chair can be produced as one piece and requires no complex assembly operations.
Solution Approach 2:
The single-body plastic shell serves multiple functions simultaneously: it provides structural support, defines the ergonomic shape, incorporates the seat and backrest surfaces, and integrates aesthetic design elements. This multi-functionality eliminates the need for separate components while maintaining all necessary ergonomic features.
2Ease of operation
If chairs are formed by multiple separate elements that are assembled together, then ergonomic comfort is improved, but production cost and assembly time increase
Solution Approach 1:
The patent combines multiple chair components into a single molded plastic body, allowing the entire chair to be manufactured in one production cycle. This eliminates sequential assembly operations and reduces production time, directly improving productivity while maintaining ergonomic comfort through the integrated design.
3Device complexity
If leaf springs are used only for exerting elastic return force on the back, then the mechanism is simple, but the chair becomes uncomfortable during use
Solution Approach 1:
The patent combines the elastic return function with the seat structure itself by integrating the leaf springs into the molded plastic body. The springs are embedded within the seat shell, allowing them to provide both the elastic return force for the backrest and guide the seat movement simultaneously, improving comfort without adding complex external mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The chair is simple and inexpensive to produce, requires no specialized assembly, provides ergonomic comfort, meets legal requirements, and offers a visually appealing aesthetic.
Implementation Method 1
elastic return means, which are connected to the back and one between the support structure and the seat, and are configured for exerting an elastic return force on the back in order to bring it back from the reclined position once again towards the rest position
Data Source
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AI summary
Chair for user sitting, which comprises a support structure (2), a seat (3), which comprises, in a single body, a support portion (31), mounted above the support structure (2), and a seat portion (32). The chair (1) also comprises a back (4), hinged and rotatable with respect to the support portion (31) between at least one rest position (A) and at least one reclined position (B). The back (4) is mechanically connected to the seat portion (32), above the hinging point, in order to move said seat portion (32) along a translation direction (T) following the rotation of the back (4). The seat (3) comprises elastic return means (5), which are integral with the support portion (31) and the seat portion (32) and comprise at least two elastic leaf springs (50), each of which comprising a central portion (51), fixed to the support portion (31), and two lateral wings (52), which are fixed to the seat portion (32) and are extended projecting from the central portion (51), moving away from the back (4), tilted with respect to an axis (N) substantially orthogonal to the seat surface of said seat portion (32). The lateral wings (52) are configured for being elastically bent between a first position, in which they are placed tilted with respect to the axis (N) by a rest angle (α), and a second bending position, in which they are placed tilted with respect to the axis (N) by an operative angle (β), smaller than the rest angle (α).