Spring Cable Counterbalance for Non-Linear Display Torque
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Solution Overview
Problem
In non-linear applications, the load moment becomes non-linear throughout the lever arm's range of motion, leading to imbalance issues, as the counterweight moment does not consistently match the load moment, causing instability.
Innovation Solution
A spring mechanism is coupled to the lever arm using a cable, producing a non-linear counter torque that opposes the display torque, ensuring balance throughout the lever arm's range of motion by varying the spring torque in opposition to the display torque, maintaining a net torque of zero.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a counterweight is used to balance the load moment, then the system achieves balance in linear applications, but the system becomes unbalanced in non-linear applications where the load moment varies throughout the range of motion
Solution Approach 1:
The patent replaces the static counterweight with a dynamic spring mechanism that can adjust its counterbalancing force throughout the lever arm's range of motion. The spring's force varies non-linearly with displacement, allowing it to adapt to changing load moments and maintain balance stability in non-linear applications.
Solution Approach 2:
The patent changes the physical parameter of the counterbalancing mechanism from a fixed mass (counterweight) to a variable force element (spring). The spring constant and displacement parameters are selected to generate a non-linear counter torque that matches the non-linear load moment profile, enabling adaptability to varying conditions.
2Stability of the object's composition
If a spring mechanism is used to provide non-linear counter torque, then the system achieves balance in non-linear applications, but the device complexity increases compared to a simple counterweight
Solution Approach 1:
The patent uses a spring as a counterbalancing element that generates a counter torque opposite to the load moment. By positioning the spring to act on the lever arm and selecting appropriate spring parameters, it provides the necessary anti-weight effect for non-linear applications without requiring complex active control systems.
Solution Approach 2:
The spring acts as an intermediary element between the lever arm and the fixed support structure. It mediates the force transmission by converting the lever arm's rotational displacement into a non-linear counter torque through its elastic deformation, simplifying the overall system architecture.
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 spring torque effectively counterbalances the display torque across the entire range of motion, preventing imbalance and ensuring stability, even in non-linear scenarios, by adjusting to the changing display torque with rotation.
Implementation Method 1
a spring that couples to the lever arm using a cable. The spring produces, through the lever arm, a spring torque around the pivot point that is equally opposite of the display torque throughout the lever arm range of motion
Data Source
AI summary
An apparatus includes a lever arm that couples to a pivot point on one end and a display on the other end. The lever arm rotates around the pivot point through a lever arm range of motion, and the weight of the display produces a display torque around the pivot point that varies as the lever arm rotates through the lever arm range of motion. The apparatus also includes a spring that couples to the lever arm using a cable. The spring produces, through the lever arm, a spring torque around the pivot point that is equally opposite of the display torque throughout the lever arm range of motion.