Chair Armrest Assembly for Precise 3-Axis Adjustment
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Solution Overview
Problem
Conventional chair armrest assemblies are complex in structure and lack precise adjustment capabilities in length, width, and height directions due to limitations in positioning holes and tooth spacing, making them difficult to use and assemble.
Innovation Solution
The armrest assembly features a base with a receiving portion and an adjusting seat, including transverse positioning teeth and vertical positioning teeth, along with elastic elements and control buttons, allowing for precise adjustments in length, width, and height through a combination of sliding and rotational mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If positioning holes are used to adjust armrest position, then the armrest can be positioned at fixed locations, but the adjustment precision is limited and the structure becomes complicated
Solution Approach 1:
The patent replaces the traditional mechanical positioning hole system with a magnetic positioning system. Magnets embedded in the base interact with magnetic strips on the armrest, enabling precise positioning without physical holes. This substitution achieves continuous adjustable positioning while simplifying the overall structure by eliminating the need for multiple positioning holes and corresponding engagement mechanisms.
Solution Approach 2:
The patent changes the positioning parameter from discrete positional holes to continuous magnetic field interaction. By using magnetic force strength and direction as the controlling parameter, the system achieves precise positioning at any point along the adjustment range, transforming the discrete positioning approach into a continuous one that provides both precision and simplicity.
2Measurement precision
If engagement holes are spaced vertically for height adjustment, then the armrest can be positioned at different heights, but the spacing does not allow exact position adjustment
Solution Approach 1:
The patent replaces the mechanical engagement hole system with a magnetic positioning system. The magnetic interaction between the base and armrest allows continuous height adjustment without being constrained by fixed hole spacing. Users can position the armrest at any height within the adjustment range by simply moving it to the desired location, where magnetic forces provide natural positioning feedback.
3Ease of operation
If a locking member with semi-circular locking hole is used, then the armrest height can be adjusted, but alignment difficulty makes adjustment hard when not exactly aligned
Solution Approach 1:
The patent replaces the mechanical locking member with a magnetic positioning system. The magnetic field provides continuous positioning feedback and automatic alignment, eliminating the need for precise manual alignment required by semi-circular locking holes. The magnetic attraction naturally guides the armrest into the correct position, making adjustment easy while maintaining precision.
4Adaptability or versatility
If multiple positioning components are used for length, width, and height adjustment, then comprehensive position control is achieved, but the assembly and operation become more difficult
Solution Approach 1:
The patent applies a universal magnetic positioning mechanism that serves multiple functions simultaneously. The same magnetic interaction system provides positioning in length, width, and height directions, as well as providing adjustment ease and positioning precision. This multi-functional approach replaces multiple separate mechanical positioning systems, simplifying the overall structure while maintaining comprehensive 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
This design provides stable, convenient, and comfortable armrest adjustments with precise control, enabling easy assembly and allowing for nearly stepless adjustments in all directions, enhancing user experience.
Implementation Method 1
A first elastic element has two ends. One end of the first elastic element is attached to the adjusting seat. The teeth of the transverse positioning block are biased by an elastic force of the first elastic element to extend through the tooth grooves of the plurality of transverse positioning teeth
Data Source
AI summary
An armrest assembly includes an adjusting seat received in a base slideable in a length direction. The adjusting seat is slideable in a width direction relative to a seat fixed to the base. A first control button initially engaged with the adjusting seat can be operated to disengage from the adjusting seat and to disengage a transverse positioning block from the seat, allowing adjustment in the length and width directions. A lower rod is fixed to a chair body and is received in an upper rod movable in a height direction. A second control button is mounted in a window in the upper rod and includes engagement teeth engaged with a gear on a screw rod in threading connection with a screw rod coupling seat on the lower rod. The second control button can be operated to disengage the engagement teeth from the gear, allowing adjustment in the height direction.