Sofa Headrest Linkage for Synchronous Retraction and Even Load
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Solution Overview
Problem
Prior art sofa pillow driving devices result in uneven stress distribution across the headrest, asynchronous retraction of the headrest sides, and difficulty in fully fitting the headrest when retracted, especially in wider sofas.
Innovation Solution
A sofa pillow driving device comprising a side plate mounting member, headrest mounting member, rotation limit member, elastic member, and driving device, where the rotation limit member is rotatably connected to the side plate mounting member, the headrest mounting member is connected to the rotation limit member, and the driving device is connected to both the rotation limit member and the backrest wood frame, allowing synchronized opening and retraction with uniform stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the headrest is pushed away indirectly by a driving device and folded by a spring, then the structure is simpler, but the two sides of the headrest are not uniformly stressed and the distance between the two sides when opened varies obviously
Solution Approach 1:
The patent introduces a rotation limit member as an intermediary component between the driving device and the headrest mounting member. This rotation limit member includes a limiting groove that guides the movement of a limiting pin, ensuring that both sides of the headrest move synchronously and maintain consistent distance during opening and closing operations, thereby resolving the precision issue while keeping the overall structure manageable.
Solution Approach 2:
The patent employs an elastic member connected to both the headrest mounting member and the rotation limit member to create a balanced force distribution system. This elastic member ensures that both sides of the headrest experience uniform stress during movement, preventing asymmetric behavior and maintaining equipotential conditions throughout the operation cycle.
2Force
If the headrest is retracted by a spring, then the retraction force is provided, but the headrest is difficult to fully fit and retracting on left and right sides are asynchronous when the sofa has a large width
Solution Approach 1:
The rotation limit member serves as a mediator that coordinates the retraction movement of both headrest sides. The limiting groove in this component guides the limiting pin to ensure synchronized movement, while the elastic member provides the necessary retraction force through balanced force distribution, achieving both full fitting and synchronous retraction.
Solution Approach 2:
The elastic member connected to both sides of the headrest mounting member creates equipotential conditions by distributing retraction force uniformly. This ensures that both left and right sides experience equal force during retraction, preventing asynchronous movement and enabling synchronized return to the initial position.
3Device complexity
If the headrest is pushed away indirectly, then the driving device structure is simpler, but uniform stress distribution across the headrest cannot be achieved
Solution Approach 1:
The elastic member is strategically positioned to connect both the headrest mounting member and the rotation limit member, creating a force distribution system that ensures uniform stress across the headrest during opening and closing operations. This equipotential arrangement balances the stress on both sides while maintaining a relatively simple driving device structure.
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
Ensures uniform stress distribution across the headrest when opened and synchronous retraction, preventing hand entrapment and maintaining consistent distance between the headrest ends, while allowing the headrest to fold neatly onto the backrest.
Implementation Method 1
one end of the elastic member being connected to the headrest mounting member and the other end being connected to the rotation limit member
Data Source
AI summary
The present invention discloses a sofa pillow driving device, which comprises a side plate mounting member, a headrest mounting member, and a driving device, the sofa pillow driving device further comprises a rotation limit member and an elastic member, the rotation limit member being rotatably connected to the side plate mounting member, the headrest mounting member being rotatably connected to the rotation limit member, one end of the elastic member being connected to the headrest mounting member and the other end being connected to the rotation limit member, one end of the driving device being rotatably connected to the rotation limit member and the other end being rotatably connected to a backrest wood frame, the driving device drives the headrest mounting member to rotate by the rotation limit member.