Automatic Headrest Lifting Linkage for Concealed Sofa Adjustment
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Solution Overview
Problem
Conventional sofa headrest adjustment mechanisms require manual operation and expose hinges, compromising comfort and aesthetics.
Innovation Solution
An automatic lifting stand with a linear drive device and connecting link assembly allows for automatic adjustment of the headrest angle without manual intervention, using a linear drive device connected to a system of linking members that unfold and fold to change the headrest position, maintaining a clean appearance by concealing the mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional hinge structure is used for headrest adjustment, then the headrest angle can be changed, but the hinge becomes exposed and compromises the sofa's appearance
Solution Approach 1:
The lifting stand mechanism is nested within the sofa body structure. The connecting links are arranged in a compact configuration where they fold into each other when retracted, allowing the adjustment mechanism to be concealed within the sofa's internal space, thus maintaining a clean external appearance while preserving adjustment functionality
Solution Approach 2:
The mechanism transitions from a two-dimensional hinge rotation to a three-dimensional linkage system that moves in multiple directions. The connecting links unfold and fold in a coordinated manner across different spatial planes, enabling the headrest to be adjusted while the mechanism remains concealed within the sofa's depth and structure
2Device complexity
If manual operation is required to pull the headrest for adjustment, then the hinge can be simple in structure, but the operation becomes inconvenient
Solution Approach 1:
The lifting stand operates automatically using a linear drive device that provides self-powered motion. The system uses an electric motor to drive the connecting links through a transmission mechanism, eliminating the need for manual pulling or forcing of the headrest, thus greatly improving ease of operation while keeping the overall structure relatively simple
Solution Approach 2:
The manual mechanical operation is replaced with an electromechanical system. The linear drive device converts electrical energy to mechanical motion, substituting the need for human physical effort with an automated motor-driven mechanism, thereby improving operational convenience
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 effortless and automatic adjustment of the headrest angle, enhancing user comfort and maintaining the sofa's aesthetic appeal by hiding the mechanism from view.
Implementation Method 1
a linear drive device and at least one connecting link assembly... The linear drive device is started to protrude its output end, which actuates the third connecting links
Implementation Method 2
the third connecting link and the fourth connecting link are folded relatively to the first fastener while the output end is drawn back, and the third connecting link and the fourth connecting link are unfolded relatively to the first fastener while the output end is protruded
Data Source
AI summary
A lifting stand for adjusting headrest includes a linear drive device and a connecting link assembly. The connecting link assembly includes a first fastener, a second fastener, a first connecting link, a second connecting link, a third connecting link, and a fourth connecting link. The first and second links are pivotally connected to the first fastener, the other end of the first connecting link is pivotally connected to the third connecting link which is connected to the second fastener, and the second connecting link is pivotally connected to the fourth connecting link which is connected to the second fastener and the third connecting link. The linear drive device is connected to the first fastener, and its output end is connected to the third connecting link. The lifting stand can automatically adjust the position of the headrest and keep a nice appearance for sofas.