Chair Chassis Single-Handle Control for Tilt and Seat Adjustment
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Solution Overview
Problem
Current chair chassis designs require multiple handles for adjusting height, tilting, and seat position, which complicates operation and affects aesthetics.
Innovation Solution
A multi-function chair chassis with a single adjusting handle featuring a spiral teeth screw rod, locating blocks, and pulling lines that allow for independent control of tilting, locking, and height adjustment, providing a compact and easy-to-operate structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple handles are used to control different chair functions (tilting, locking, height adjustment), then each function can be controlled independently, but the number of handles increases affecting aesthetics and operational simplicity
Solution Approach 1:
The patent combines multiple independent handle functions into a single integrated adjusting handle assembly. This handle integrates the tilting control, locking mechanism, and height adjustment functions that were previously controlled by separate handles, thereby reducing the number of components while maintaining full functional control over the chair's backrest and seat positioning
Solution Approach 2:
The single adjusting handle is designed as a multi-functional device that can perform multiple operations: controlling backrest tilting angle, locking/unlocking the tilting position, and adjusting seat height. This universal handle replaces several specialized handles, achieving the same adaptability with reduced complexity
2Device complexity
If a single multi-function handle is used to control tilting, locking, and height adjustment, then the number of handles is reduced improving aesthetics and simplicity, but the mechanism complexity within the handle increases
Solution Approach 1:
The adjusting handle is segmented into distinct functional modules: a tilting control section with spiral teeth for angle adjustment, a locking section with a locating block and pulling line for securing positions, and a height adjustment section with a block that slides along the screw rod. This segmentation allows each module to be manufactured and assembled independently, simplifying the overall manufacturing process despite the integrated functionality
3Ease of manufacture
If height adjustment is limited to pulling the handle only, then the mechanism remains simple, but the adjustment range and user comfort are restricted
Solution Approach 1:
The height adjustment mechanism transitions from a static pull-only operation to a dynamic system where the block can slide along the adjusting screw rod in multiple directions. This allows the user to adjust height by pulling the handle upward or by sliding the block along the rod, providing greater adjustment range and flexibility while maintaining mechanical simplicity through the existing screw rod 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
Enables users to seamlessly control tilting, locking, and lifting of the chair's components with a single handle, enhancing user comfort and reducing the number of handles, thus improving the chair's aesthetic appeal and operational simplicity.
Implementation Method 1
The adjusting handle comprises an adjusting screw rod. On one end of the adjusting screw rod exists spiral teeth, which can adjust the angle of the back by rotating.
Implementation Method 2
A first pulling line is wrapped around the locating block, and it can lock or unlock the right or left tilting angle of the connecting rods.
Data Source
AI summary
A chair chassis, comprising a chassis pedestal, a left and a right connecting rod for back, a seat supporting frame, an adjusting handle, the adjusting handle comprises an adjusting screw rod. On the adjusting screw rod exists a locating block for mounting handle and, the first pulling line and the second pulling line are wrapped around it, the two pulling lines are respectively used to lock or unlock the tilting angle of the back and to lock or unlock the position of the supporting frame; the adjusting handle also comprises a block for the pulling line, which is connected with the third pulling line, and the block for the pulling line is connected with the adjusting screw rod and can relatively slide on it. The invention is multi-functioned with the action of only one adjusting handle, and the structure of the invention is compact, and it is convenient to operate.