Chair with a fitting for removably coupling a chair to a table
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Solution Overview
Problem
Existing chair-table coupling mechanisms restrict the ability to adjust the angle between the chair and tabletop without redesigning the chair, leading to potential scratches and limited versatility.
Innovation Solution
A removable fitting system with a C-shaped channel and adjustable attachments between the chair's backrest and seat portion, allowing for varying angles and reduced protrusion of chair legs, preventing direct contact between hard surfaces and enabling easy replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a continuous backrest structure is used to support the chair on the tabletop, then the chair can be stably coupled to the table, but the angle between the tabletop and chair cannot be changed and the structure limits chair design versatility
Solution Approach 1:
The backrest is divided into a continuous portion and a separate adjustable portion that can be independently positioned. This segmentation allows the adjustable portion to be moved to different locations along the backrest, enabling angle adjustment while maintaining overall structural stability through the continuous backrest portion.
Solution Approach 2:
The adjustable portion of the backrest is designed to be movable rather than fixed, allowing it to be repositioned along the continuous backrest. This dynamic element enables the angle between the tabletop and chair to be changed without redesigning the entire chair structure, while the continuous backrest provides stable support.
2Ease of operation
If the tabletop is placed between the backrest and armrest or seat portion, then the chair can be coupled to the table, but the angle between the tabletop and chair cannot be varied without redesigning the chair
Solution Approach 1:
The backrest is segmented into a continuous portion and a separate adjustable portion. This segmentation allows the adjustable portion to be independently repositioned to achieve different angles, while the continuous backrest maintains the simple coupling structure between tabletop and chair.
Solution Approach 2:
The adjustable portion serves multiple functions: it enables angle adjustment, maintains structural stability, and allows easy coupling to the tabletop. This multi-functionality achieves angle variation without increasing overall chair structure complexity.
3Force
If the tabletop bears against the back portion and seat portion, then the chair can be supported on the table, but scratches are easily formed on these components
Solution Approach 1:
A separate adjustable portion of the backrest is introduced as an intermediary element between the tabletop and the main chair structure. This intermediary component bears the contact force from the tabletop, preventing direct contact and potential scratches on the back portion and seat portion.
Solution Approach 2:
The contact function between tabletop and chair is extracted from the main back portion and seat portion, and assigned to a separate adjustable portion. This extraction protects the original components from scratches while maintaining the support function.
4Ease of repair
If a removable fitting is used to couple the chair to the table, then the fitting can be easily replaced, but the fitting mouth must be precisely positioned to control leg protrusion
Solution Approach 1:
The fitting system is segmented into a removable fitting portion and a fixed mounting portion. The removable fitting can be easily replaced, while the fixed mounting portion ensures precise positioning relative to the chair structure, controlling leg protrusion without requiring high precision in the removable component itself.
Solution Approach 2:
The fitting acts as an intermediary component that can be easily replaced. The mounting structure provides the precise positioning reference, while the removable fitting itself does not require high manufacturing precision, as its position is determined by the mounting features.
Data Source
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AI summary
The invention relates to a fitting (2) for coupling a chair (1) and a table (7) to each other in a removable manner, the table (7) comprising a tabletop (71) which rests on table legs (72) and the chair (1) comprising a back (11) as well as a seat portion (12) provided with chair legs, said seat portion (12) having a sitting section (121) which rests on a horizontal frame (122) of the seat portion, said frame having also connected therewith an upward directed back (11) by way of a support rack (111), whereby on the support rack (111) of the chair's back (11) is mounted fixedly or removably said fitting (2). The fitting (2) has a mouth (6), comprising a mouth bottom (61) as well as an upper jaw (62) of the mouth and a lower jaw (63) of the mouth integral with the mouth bottom (63) which extend at a distance (V) from each other over the entire length thereof, whereby the upper and lower jaws (62, 63) are co-directional with or at an angle relative to each other and between what in a view from the mouth bottom are the furthermost edges (62b, 63b) thereof is left an entrance (64) of the mouth, which, in a view from the mouth bottom, is located in its entirety ahead of the sitting section (121) of the chair's seat portion and opens towards said sitting section, such that between a middle plane (K) of a mouth opening (65) left between the mouth's upper and lower jaws (62, 63) and a middle plane (T) of the tabletop is established an acute angle (a) as the chair (1) has been coupled to the tabletop (71) by way of the fitting (2) by arranging the tabletop (71) in the mouth opening (65) in such a way that the mouth has its trough bottom (61) and its upper jaw (62) bearing against a top surface (71 a) of the tabletop (71) and the mouth has its lower jaw (63) bearing against a bottom surface (71 b) of the tabletop.