Structure for adjusting support force of lumbar pillow, and chair
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Solution Overview
Problem
Current lumbar pillows on chairs can only adjust their position, failing to provide varying support forces suitable for different users, leading to inadequate support for the lumbar region, which can cause fatigue and spinal issues.
Innovation Solution
A structure comprising a backrest bracket, lumbar pillow, elastic support, and an adjustment mechanism with a lead screw and bevel gears that allows the support force to be adjusted by changing the support angle and deformation of the elastic support, accommodating different user needs and body shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lumbar pillow is fixed to the backrest bracket without adjustment mechanism, then the structure is simple and stable, but the support force magnitude cannot be adjusted for different users
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed lumbar pillow structure into an adjustable one. The elastic support connects the lumbar pillow to the backrest bracket, allowing the support force to be dynamically adjusted through the lead screw mechanism. This enables the system to adapt to different users while maintaining structural integrity, resolving the contradiction between adaptability and structural stability.
Solution Approach 2:
The patent implements parameter changes by using a lead screw mechanism to adjust the support angle of the elastic support. By rotating the lead screw, the slider moves along the vertical direction, changing the angle between the elastic support and the backrest bracket. This parameter adjustment directly controls the magnitude of support force, enabling customization for different users without complex overhauls of the entire structure.
2Adaptability or versatility
If the lumbar pillow can only adjust position, then the structure is simple, but it fails to provide varying support forces for different users
Solution Approach 1:
The patent introduces an intermediary mechanism - the lead screw and slider assembly - that mediates between the user's manual operation and the adjustment of support force. By rotating the lead screw, the user indirectly controls the slider's position, which in turn adjusts the elastic support's angle and the resulting support force. This intermediary mechanism provides precise control while maintaining ease of operation through simple rotational motion.
3Adaptability or versatility
If the elastic support angle is fixed, then the manufacturing is simple, but the support force magnitude cannot be adjusted
Solution Approach 1:
The patent applies segmentation by dividing the adjustment function into separate components: the elastic support, the slider, and the lead screw. This segmentation allows each component to be manufactured independently with standard tolerances, reducing overall manufacturing complexity. The slider with internally threaded hole and the lead screw with external threads are separate manufacturable parts that assemble together to provide the angle adjustment capability.
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 convenient adjustment of the support force to match individual user requirements, enhancing lumbar support and improving user experience by allowing customizable support for the lumbar region.
Implementation Method 1
the adjustment mechanism includes a lead screw, wherein the lead screw runs through the internally threaded hole, the lead screw is rotatably connected to the backrest bracket, and an extension direction of a rotation axis of the lead screw with respect to the backrest bracket is consistent with a vertical direction of the backrest bracket; and in response to the lead screw rotating with respect to the backrest bracket, the slider slides upward and downward along the vertical direction of the backrest bracket
Implementation Method 2
one end of the elastic support is connected to a back of the lumbar pillow, and the other end of the elastic support is provided with a slider... to change a support angle of the elastic support for the lumbar pillow, such that a magnitude of the support force of the elastic support to the lumbar pillow is adjusted
Data Source
AI summary
The structure for adjusting a support force of a lumbar pillow includes: a backrest bracket, a lumbar pillow, an elastic support, and an adjustment mechanism; wherein a top of the lumbar pillow is flexibly connected to a front side of the backrest bracket; one end of the elastic support is connected to a back of the lumbar pillow, and the other end of the elastic support is provided with a slider, the slider being provided with an internally threaded hole; the adjustment mechanism includes a lead screw; and in response to the lead screw rotating with respect to the backrest bracket, the slider slides upward and downward along the vertical direction of the backrest bracket to change a support angle of the elastic support for the lumbar pillow, such that a magnitude of the support force of the elastic support to the lumbar pillow is adjusted.