Zero-Wall Recliner Linkage With Single-Actuator Motion Sequencing
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Solution Overview
Problem
Existing motion upholstery furniture requires complex linkage mechanisms for reclining, lifting, and adjusting positions, which limits design flexibility and incorporation of automation due to interference issues with motors and other components, necessitating multiple motors for full range of motion.
Innovation Solution
A simplified lifter-recliner linkage mechanism using a single compact motor and innovative sequencing of cam control links, sequence cams, and linear actuators to achieve automatic adjustment between closed, extended, reclined, and seat-lift positions without interference, allowing for various styling options and reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional linkage mechanisms are used for reclining and lifting seating units, then full range of motion can be achieved, but the mechanism complexity increases and requires multiple motors with extensive strokes
Solution Approach 1:
The linkage mechanism is divided into separate functional modules: a reclining mechanism with pivot points for backrest adjustment, and a lifting mechanism with linkages for seat elevation. This segmentation allows each module to be optimized independently, reducing overall complexity while maintaining full range of motion capabilities.
Solution Approach 2:
The patent introduces a vertical lifting dimension in addition to the horizontal reclining motion. By adding lift assemblies with their own linkage system, the mechanism achieves three-dimensional movement capability (reclining angle + lifting height + footrest extension), eliminating the need for overly complex single-plane mechanisms.
2Extent of automation
If complex linkage assemblies are used to provide reclining and lifting capability, then full movement range is achieved, but automation becomes constrained due to motor interference with crossbeams and moving parts
Solution Approach 1:
The motor mounting locations are extracted and positioned in dedicated spaces that do not interfere with the linkage movement paths. The reclining motor is mounted to affect backrest rotation without contacting crossbeams, and the lifting motor is positioned to drive vertical motion without interfering with footrest or backrest movement, thereby enabling full automation.
Solution Approach 2:
The patent introduces intermediate transmission elements such as pulleys, belts, or gear mechanisms that transfer motor power to the linkage components without direct motor contact with moving parts. This intermediary approach allows motors to be positioned in fixed locations while still achieving controlled movement of all linkage components through the transmission system.
3Adaptability or versatility
If traditional linkage mechanisms are used, then reclining function is provided, but wall clearance requirements increase limiting placement flexibility
Solution Approach 1:
Instead of having the backrest pivot forward from a vertical position, the mechanism is inverted to pivot rearward from an already-reclined position. This inversion allows the seating unit to be placed directly against a wall in its upright position, with the reclining motion occurring away from the wall, thereby eliminating the need for front clearance space.
Solution Approach 2:
The linkage mechanism employs dynamic adjustment of pivot points and linkage lengths during the reclining cycle. As the backrest reclines, the mechanism dynamically shifts its effective pivot location to maintain optimal motion arcs, allowing the unit to achieve full recline angles even when constrained by a wall behind it.
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 solution enables efficient, automated, and cost-effective adjustment of seating units with reduced complexity, maintaining the seat's consistent location and allowing for zero-wall clearance, enhancing operational stability and design flexibility.
Implementation Method 1
a cam control link, a sequence cam, and a sequence element. The cam control link includes a front end and a rear end, where the front end of the cam control link is pivotably coupled with the footrest assembly. The sequence cam includes a contact edge and is rotatably coupled to the seat-mounting plate
Implementation Method 2
The linkage mechanism may be configured with features that assist in sequencing the seating-unit adjustment between positions... a linear actuator that provides automated adjustment of the linkage mechanisms
Data Source
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AI summary
A seating unit that includes a linkage mechanism adapted to move the seating unit between closed, extended, reclined, and seat-lift positions is provided. The linkage mechanism includes a footrest assembly and a back-mounting link coupled to a seat-mounting plate, a base plate coupled to a lift-base assembly via a lift assembly, a seat-adjustment assembly including a drive bracket, and a linear actuator for automating adjustment of the linkage mechanism. In operation, a stroke in a first phase of the linear actuator rotates the drive bracket a first angular increment causing the seat-adjustment assembly to bias the seat-mounting plate. A stroke in a second phase rotates the drive bracket a second angular increment causing the footrest assembly to extend or retract without affecting the bias of the back-mounting link. A stroke in a third phase causes the lift assembly to raise and tilt the base plate directly over the lift-base assembly.