Display Support Arm With Variable Torque Balance Positioning
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Solution Overview
Problem
Existing supporting devices for displays lack the ability to maintain the display at arbitrary positions between the lowest and highest positions without external force, as they fail to balance torques effectively, leading to instability and limited adjustability.
Innovation Solution
A supporting device with a constant force arm unit, a variable force arm unit, and an elastic force module, where the first wire is wound on a shaft with a constant diameter and the second wire is wound on a gyro body with a spiral groove, allowing for torque balance and adjustable positioning through the interaction of the elastic force and the variable effective force arms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed effective force arm is used in the lifting device, then the structure is simple, but the display cannot be stably maintained at arbitrary positions without continuous external force
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed effective force arm into a variable effective force arm. The second wire is wound around a gyro body with a spiral groove instead of a straight shaft, allowing the effective force arm length to change dynamically as the wire unwinds. This enables the device to adapt its mechanical advantage at different positions, allowing stable maintenance at arbitrary positions without continuous external force while managing structural complexity.
2Reliability
If the wire is wound on a straight shaft, then the effective force arm is constant, but torque cannot be balanced at arbitrary positions
Solution Approach 1:
The patent applies the curvature principle by replacing the straight shaft with a gyro body featuring a spiral groove. The spiral (curved) geometry of the groove causes the effective force arm to vary as the wire unwinds, creating the necessary torque balance capability at different positions. This curved structure enables reliable torque balance while accepting the increased structural complexity of the gyro body.
3Ease of operation
If elastic force is used to counterbalance gravity, then the display can be held at arbitrary positions, but the elastic force varies with position requiring variable effective force arm
Solution Approach 1:
The patent applies the parameter changes principle by varying the effective force arm length (through the spiral groove geometry) to match the changing elastic force at different positions. As the elastic force decreases when the display is raised, the effective force arm also decreases proportionally, maintaining torque balance. This enables full positioning capability while managing the complexity through a unified spiral groove design.
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 the display to be stably maintained at any position between the lowest and highest positions by balancing torques, providing enhanced adjustability and stability without the need for continuous external force.
Implementation Method 1
an elastic member having a first end and a second end opposite to each other, wherein the first end is connected to the first tail end of the first wire, and the elastic member constantly provides an elastic force
Implementation Method 2
when the external force is removed, a first torque generated in the first wire and a second torque generated in the second wire are balanced each other
Data Source
AI summary
A supporting device is provided and includes: a base; an upright column disposed on the base; a lifting module disposed on the upright column; a constant force arm unit including: a first rotating member rotatably disposed on the upright column and defining a constant first effective force arm; and a first wire wound on the first rotating member; a variable force arm unit including: a second rotating member linked with the first rotating member and defining a variable second effective force arm; and a second wire wound on the second rotating member; and an elastic force module connected to the first wire; where the torques respectively generated in the first wire and the second wire are balanced with each other.