Backward-Tilt Stop Layout for Better Chair Force Absorption
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Solution Overview
Problem
Existing seating furniture designs suffer from unfavorable leverage ratios during the limitation of the opening movement of the seat surface with respect to the backrest, leading to inefficient force absorption and restricted movement.
Innovation Solution
The backward-tilt stop is positioned in extension of the vertical support of a pedestal, directly or indirectly connected to both the seat and the pedestal, allowing for improved force absorption and enabling variable movement by incorporating a blockable and pivotable mechanism with a stop shaft and stop piston, and a spherical or hemispherical connection element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the backward-tilt stop is positioned next to a vertical support of a pedestal, then the opening movement of the seat surface is limited, but unfavorable leverage ratios arise leading to inefficient force absorption
Solution Approach 1:
The backward-tilt stop is repositioned from a lateral position next to the vertical support to an extension of the vertical support itself, changing the spatial dimension of force application. This dimensional change optimizes the leverage ratio by aligning the stop directly with the vertical load path, improving force absorption efficiency.
2Reliability
If the backward-tilt stop is positioned in extension of the vertical support of a pedestal, then forces are well absorbed during use, but the structure requires additional connection elements
Solution Approach 1:
The backward-tilt stop is merged with the vertical support structure by positioning it in extension of the support. This integration reduces the number of separate connection elements needed, as the stop becomes part of the existing vertical load-bearing structure rather than a separate component requiring additional connections.
3Stability of the object's composition
If the backward-tilt stop is blocked, then no relative movement of the seat with respect to the vertical support is possible, but no relative movement of the backrest with respect to the seat is also possible
Solution Approach 1:
The backward-tilt stop incorporates a variable-length section that can transition between blocked and unblocked states. This dynamic capability allows the system to switch between stable (blocked) and adaptable (unblocked) configurations, enabling both firm seat positioning and flexible movement when needed.
Solution Approach 2:
The stop mechanism changes its length parameter dynamically through the variable-length section. By adjusting the length parameter between blocked and unblocked states, the system can control the degree of movement restriction, allowing operators to modify the mechanical parameters to suit different usage requirements.
Data Source
AI summary
A piece of seating furniture includes a backrest and a seat. The seat is operatively connected to the backrest. The backrest and the seat, during a pivoting of the backrest, open one another at an opening angle. A backward-tilt stop is included for limiting relative movement of the seat and the backrest. The backward-tilt stop is situated in extension of a vertical support of a pedestal.