Movable Seating Mechanical Extension Device for Zero-Wall Clearance
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Solution Overview
Problem
Existing movable seat designs fail to achieve true zero-wall clearance and comfort due to complex mechanical structures, stiffness, and gaps between the backrest and seat during position transitions, which also cause clothing to be pulled out.
Innovation Solution
A mechanical extension device with a multi-link mechanism, including a seat frame, backrest assembly, and leg extension device, that allows the seating device to transition seamlessly between sitting, TV, and reclining positions without backward movement of the backrest, ensuring zero-gap design and comfort by using a four-bar linkage and linear electric actuator for smooth motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex mechanical structures with multiple connections are used to enable position transitions, then the seating device can achieve multi-position transformation functions, but the device complexity increases and manufacturing costs increase
Solution Approach 1:
The mechanical extension device is divided into independent functional modules: a leg extension device for extending the footrest, and a backrest assembly for controlling backrest movement. This segmentation allows each module to be optimized independently, reducing overall structural complexity while maintaining multi-position transformation capabilities.
Solution Approach 2:
The patent employs dynamic mechanical linkages that automatically adjust the relationship between the backrest and seat section during position transitions. The linkage system dynamically changes the relative positions and angles of components, enabling smooth transitions without requiring complex fixed connections or multiple adjustment mechanisms.
2Adaptability or versatility
If traditional mechanical linkages are used for position transitions, then the seating device can change positions, but stiffness appears in the mechanical structure's posture transitions
Solution Approach 1:
The mechanical extension device uses dynamic linkages that automatically adjust during motion, allowing the structure to adapt to changing positions smoothly. The leg extension device and backrest assembly work in coordination to maintain optimal mechanical advantage throughout the transition range, eliminating stiffness and enabling fluid posture changes.
Solution Approach 2:
The patent changes key geometric parameters of the mechanical linkage during operation. As the seating device transitions between positions, the angles and relative positions of linkage components change dynamically, allowing the mechanism to maintain smooth motion characteristics across the entire range of motion rather than being constrained by fixed geometric relationships.
3Adaptability or versatility
If the backrest is pivotally connected to enable reclining motion, then the seating device can transition to reclining positions, but gaps appear between the backrest portion and seat section during unfolding
Solution Approach 1:
The backrest assembly uses a dynamic linkage system that maintains continuous contact between the backrest portion and seat section during the transition from sitting to reclining position. The mechanical connection dynamically adjusts to eliminate gaps, ensuring the backrest remains firmly attached to the seat throughout the entire motion range while still enabling full reclining capability.
4Adaptability or versatility
If the rear end of the backrest moves backward during transition, then the backrest can recline properly, but zero wall clearance layout cannot be achieved
Solution Approach 1:
The patent resolves the space conflict by changing the dimension of motion. Instead of allowing the backrest to move purely in the horizontal backward direction, the mechanical extension device guides the backrest assembly through a combined motion path that includes vertical and forward components. This dimensional change allows the backrest to achieve proper reclining angles while minimizing backward displacement, enabling zero wall clearance layouts.
Data Source
AI summary
Provided is a seating device including an armrest, a seat, a backrest, an ottoman, and a mechanical extension device including a seat frame attached to the seat, a backrest assembly including a backrest bracket; a leg extension device. The mechanical extension device is configured to move the seating device from a first position to a second position. The backrest assembly includes a backrest bracket, a first backrest link, and a second backrest link, the backrest bracket is configured to attach the backrest, the first backrest link is pivotally connected to a front end of the backrest bracket at a first pivot point, the first backrest link is pivotally connected to the seat frame at a second pivot point, and the first pivot point has a trajectory that moves towards the leg extension device in the process of moving the seating device from the sitting position to the reclining position.