Arm Stand Rotary Link Unit with Counterweight for Wide Angle Adjustment
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Solution Overview
Problem
Conventional arm stands for display units have a limited range of height adjustment due to the elastic force of springs causing parallel links to return to their original position beyond a certain angle, restricting the range within which the display unit can be adjusted.
Innovation Solution
An arm stand design featuring a rotary link unit with a tension spring that applies equal forces to both the main and auxiliary rotary links, allowing the display unit to maintain a stationary state at any angle within a 0° to 90° range, thereby increasing the adjustability of the display unit's height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a spring is used in the conventional arm stand to support the display unit, then the display unit can be supported with adjustable position, but the elastic force of the spring causes the parallel links to return to their original position beyond a predetermined angle, limiting the adjustment range
Solution Approach 1:
The patent introduces a counterweight mechanism that balances the elastic force of the spring, allowing the parallel links to maintain stationary positions beyond the predetermined angle. The counterweight creates a opposing moment that counteracts the spring's restoring force, enabling the display unit to be held at various angles within the 0° to 90° range without returning to the original position.
Solution Approach 2:
The patent modifies the mechanical parameters of the arm stand by introducing additional links and adjusting the moment arms. This changes the force balance equation, allowing the system to maintain equilibrium at larger rotation angles. The parameter changes enable the display unit to be positioned anywhere from 0° to 90° while maintaining a stationary state.
2Adaptability or versatility
If the parallel links are designed to rotate beyond 40° to 45°, then the height adjustment range is increased, but the elastic force of the spring causes the links to return to their original positions, making it impossible to maintain the adjusted position
Solution Approach 1:
The counterweight mechanism provides a balancing moment that opposes the spring's elastic restoring force. This allows the parallel links to be held at any rotation angle from 0° to 90° without automatically returning to the original position, making the adjusted position maintainable across the full rotation range.
3Reliability
If a complex mechanism like cams is used to maintain the display unit at any position, then the position stability is improved, but the device complexity and production cost increase
Solution Approach 1:
The patent divides the arm stand into multiple independent links (mounting bracket, horizontal bracket, parallel links) that work together through simple rotational joints. This segmentation allows each component to perform a specific function while maintaining overall position stability, avoiding the need for a single complex cam mechanism.
Solution Approach 2:
The patent creates a dynamic balance system where the counterweight and spring forces continuously adjust to maintain equilibrium at any angle. This dynamic approach replaces static complex mechanisms like cams, providing position stability through force balance rather than mechanical constraints.
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
The arm stand allows for greater adjustability of the display unit's position without returning to its original position, maintaining an upright state and enabling rotation beyond 90°, while simplifying the construction and reducing production costs by avoiding complex components like cams.
Implementation Method 1
a tension spring which is rotatably provided between a first upper support axis formed above the base rotating axis of the mounting bracket and a lower support axis formed in the horizontal bracket below the central rotating axis
Data Source
AI summary
The present invention provides an arm stand for a display unit which includes a mounting bracket (110), a horizontal bracket (150) and a rotary link unit (120). The rotary link unit includes a main rotary link (130) which is rotatably provided between a base rotating axis (a) of the mounting bracket and a central rotating axis (b) of the horizontal bracket, and an auxiliary rotary link (190) which is rotatably provided between a first upper support axis (c) formed in the mounting bracket above the base rotating axis and a second upper support axis (d) formed in the horizontal bracket above the central rotating axis. The rotary link unit further includes a tension spring (170) which is rotatably provided between the first upper support axis and a lower support axis (e) formed in the horizontal bracket below the central rotating axis.