Zero-Wall Recliner Linkage With Single-Motor Motion Sequencing
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Solution Overview
Problem
Conventional linkage mechanisms in motion upholstery furniture require complex designs and multiple motors to achieve full range of motion, often causing interference and out-of-sequence adjustments between positions, limiting design flexibility and automation efficiency.
Innovation Solution
A simplified lifter-recliner linkage mechanism that can be assembled with a single compact motor, featuring a sequence plate and linear actuator with phased movements to ensure sequenced adjustment between closed, extended, reclined, and seat-lift positions, maintaining consistent inclination and preventing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional linkage mechanisms are used to achieve full range of motion, then the seating unit can reach all required positions, but the device complexity increases and multiple motors are required
Solution Approach 1:
The linkage mechanism is divided into multiple articulated segments including a seat pan, backrest, footrest, and various linkage arms connected by pivots. This segmentation allows each component to move independently through its required range while maintaining overall coordination, achieving full range of motion without requiring an overly complex monolithic structure
Solution Approach 2:
The linkage mechanism employs dynamic geometric relationships where the relative positions and orientations of linkage components change during operation. The mechanism transitions between different geometric configurations to achieve various seating positions (seated, reclined, elevated) while maintaining mechanical advantage and control throughout the range of motion
2Extent of automation
If multiple motors with extensive strokes are used to automate the linkage mechanism, then full automation is achieved, but the device complexity and cost increase
Solution Approach 1:
The mechanism combines multiple functions (seating, reclining, elevating, footrest extension) into a single integrated linkage system that can be controlled by one motor. The articulated linkage structure allows one motor to sequentially actuate multiple degrees of freedom through mechanical coupling, reducing the number of motors required while maintaining full automation capability
Solution Approach 2:
The linkage mechanism is designed with pre-configured geometric relationships and mechanical advantages that allow a single motor to sequentially drive different components through controlled phases of motion. The mechanism prepares and transitions through intermediate positions that enable one motor to achieve what would otherwise require multiple motors with extensive strokes
3Adaptability or versatility
If complex linkage assemblies are used, then full range of motion is achieved, but the motor interferes with crossbeams, underlying surface, or moving parts during adjustment
Solution Approach 1:
The linkage mechanism utilizes three-dimensional spatial arrangement where components move in multiple directions and planes. The motor is positioned and oriented to drive the linkage through a path that clears crossbeams and the underlying surface by utilizing vertical and lateral dimensions, avoiding interference while maintaining full range of motion
4Ease of operation
If conventional linkage mechanisms are used, then seating unit positions can be adjusted, but the ottoman and backrest move out of sequence during motorized adjustment
Solution Approach 1:
The linkage mechanism incorporates pre-configured mechanical coupling and geometric constraints that ensure components move in the correct sequence. The mechanism is designed so that the motor's motion path naturally causes the ottoman to extend before the backrest reclines, maintaining proper sequencing without requiring additional control mechanisms
Solution Approach 2:
The linkage mechanism uses intermediate linkage components and pivot points that mediate the motion between the motor, ottoman, and backrest. These intermediary elements translate and coordinate the motor's linear or rotational motion into the sequential angular movements required for proper component sequencing
5Area of stationary object
If the seating unit is positioned against a wall or within close proximity of fixed objects, then space utilization is improved, but conventional linkage mechanisms cannot achieve full range of motion
Solution Approach 1:
The linkage mechanism is designed to utilize vertical space and three-dimensional motion paths, allowing the backrest to recline by moving through a trajectory that clears the wall or fixed objects. The mechanism employs angular and vertical displacement rather than purely horizontal movement, enabling full reclining capability even when positioned close to vertical surfaces
Data Source
AI summary
A seating unit that includes a linkage mechanism adapted to move the seating unit between seat-lift, closed, extended, reclined, and seat-lift positions is provided. The linkage mechanism includes a seat-mounting plate mounted to a footrest assembly, a base plate fixedly mounted to a lift assembly, a back-mounting link rotatably coupled to the seat-mounting plate, a seat-adjustment assembly with a bellcrank, and a linear actuator for automating adjustment of the linkage mechanism. In operation, a stroke in a first phase of the linear actuator generates a force on the bellcrank that translates the seat-mounting plate rearward in a consistent angle of inclination and rotates the back-mounting link from a reclined to an upright orientation. A stroke in a second phase acts to collapse the footrest assembly. A stroke in a third phase causes the lift assembly to raise and tilt the seating unit, thereby accommodating egress and ingress of an occupant.