Adjustable Sofa Backrest Rail Mechanism for Continuous Seat Depth
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Solution Overview
Problem
Traditional sofas have non-adjustable seat depths, leading to discomfort for individuals of varying sizes, and existing adjustable sofas have limited depth adjustment ranges and cumbersome mechanisms that shorten their lifespan.
Innovation Solution
A sofa design featuring an adjustable backrest with a guide rail rack and drive means, allowing continuous seat depth adjustment through a sliding mechanism with minimal friction, facilitated by an electric motor for easy operation and enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If tongue and groove engagement is used to adjust backrest position, then adjustable seat depth is achieved, but the range of adjustment is very limited
Solution Approach 1:
The patent replaces the traditional tongue and groove engagement mechanism with an electric motor-driven sliding mechanism. The support bracket slides along the guide rail under motor control, enabling continuous adjustment of backrest position rather than limited preset positions. This substitution of mechanical engagement with motorized actuation resolves the contradiction by providing unlimited adjustment range while maintaining operational simplicity.
Solution Approach 2:
The invention transitions from a static preset position system to a dynamic continuous adjustment system. The electric motor enables the support bracket to move smoothly along the guide rail to any desired position, making the seat depth adjustable dynamically rather than being constrained to fixed predetermined positions, thereby significantly expanding the adjustment range.
2Strength
If large size backrest is used, then structural stability is improved, but average user may have difficulty in adjusting the position
Solution Approach 1:
The patent replaces manual adjustment of the large backrest with an electric motor-driven system. The motor provides the necessary force to move the support bracket and backrest assembly, eliminating the need for users to manually manipulate the heavy structure. This allows users with average strength to easily adjust the backrest position while the large backrest maintains its structural stability for comfort and support.
Solution Approach 2:
The electric motor acts as an intermediary between the user's control input and the backrest position change. Instead of users directly moving the large backrest, they control the motor which then moves the support bracket along the guide rail, indirectly adjusting the backrest position. This intermediary mechanism makes operation easy while preserving the backrest's large size and stability.
3Adaptability or versatility
If repeated dismounting or connection is performed, then adjustability is achieved, but life of sofa is shortened
Solution Approach 1:
The patent replaces the dismountable tongue and groove connection system with a permanent guide rail and sliding support bracket mechanism. The support bracket continuously slides along the fixed guide rail without requiring disassembly or reconnection. This eliminates the wear and loosening associated with repeated mounting and dismounting, thereby maintaining adjustability while significantly extending the sofa's service life.
Solution Approach 2:
The invention separates the adjustable component (support bracket) from the fixed structural component (guide rail). The guide rail remains permanently fixed to maintain structural integrity, while only the support bracket moves along it. This segmentation allows continuous adjustment without requiring disconnection of the main structural elements, preventing the wear and reliability issues caused by repeated assembly and disassembly.
4Adaptability or versatility
If guide rail rack with sliding mechanism is used, then continuous adjustment is enabled, but friction resistance increases
Solution Approach 1:
The patent replaces direct sliding contact with a wheel-on-rail rolling mechanism. Wheels are installed on the support bracket to roll along the guide rail, converting sliding friction into rolling friction. This substitution dramatically reduces the resistance force, allowing the electric motor to easily move the backrest assembly through the continuous adjustment range without excessive power requirements.
Solution Approach 2:
The invention changes the physical state of the contact interface from sliding to rolling motion. By introducing wheels, the mode of interaction between the support bracket and guide rail changes from sliding friction to rolling friction, which has a much lower coefficient of resistance. This parameter change in the motion type enables continuous adjustment with minimal friction resistance.
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
Enables easy and continuous adjustment of seat depth, improving user comfort and extending the sofa's lifespan by reducing mechanical stress and friction, while maintaining a compact and durable structure.
Implementation Method 1
The second end of the support bracket is provided with a wheel, and the guide rail is provided with a groove in which the wheel may be disposed in a rollable manner. The cooperation between the wheel and the groove is called rolling cooperation with less friction
Data Source
AI summary
A sofa (1) having adjustable backrest position, and including a seat frame (10), a backrest frame (20), a guide-rail frame (30) and a driving device (40); the guide-rail frame (30) includes a guide-rail (300) which is fixedly connected to the seat frame (10) and which extends in the front-back direction of the sofa (1); a first end of a support frame (50) is connected to the backrest frame (20); a second end of the support frame (50) is connected to the guide-rail (300) so as to be able so slide relative thereto; the driving device (40) is arranged so as to be linked-motion connected to the support frame (50) in order to lead the second end of the support frame (50) to slide relative to the guide-rail (300).