Dual Spring Counterbalance Assembly for Mechanical Arms
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Solution Overview
Problem
Conventional counterbalancing mechanisms for mechanical arms, such as counterweights and spring-based systems, face challenges in maintaining balance across the full range of motion due to added mass, increased inertia, and the risk of drifting or falling under gravity, necessitating the use of brakes or overbalancing to prevent accidents.
Innovation Solution
A dual spring counterbalance assembly is introduced, featuring two force-generating devices interacting with cams fixed eccentrically relative to the pivot of a joint, which maintains equilibrium torque throughout rotation by adjusting the pre-compression of springs to counteract the payload's weight and linear changes in force, allowing for continuous balance without the need for counterweights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If counterweights are used to balance the mechanical arm, then gravitational force is counteracted, but added mass and increased inertia occur
Solution Approach 1:
The patent uses springs configured to provide upward counterbalancing force against the downward gravitational force on the payload, creating an anti-weight effect without adding significant mass. The springs are arranged to oppose the weight force directly, achieving balance through elastic force rather than gravitational counterweight.
Solution Approach 2:
The invention replaces the traditional mechanical counterweight system with a spring-based elastic force system. This substitution eliminates the need for heavy counterbalancing masses while maintaining the gravitational counteraction function through the elastic properties of the springs.
2Force
If tension springs are used for balancing, then balance is achieved within a small angle, but complete balance is possible only for one or two configurations
Solution Approach 1:
The balancing system is divided into multiple spring elements arranged at different orientations and positions. This segmentation allows each spring to contribute to balancing at different angular positions, collectively providing balance across the full range of motion rather than being limited to a single configuration.
Solution Approach 2:
The patent extends the balancing capability from a single-plane, single-configuration system to a multi-dimensional arrangement with springs positioned at various angles and locations. This dimensional expansion enables the system to maintain balance across multiple configurations and the entire range of motion.
3Adaptability or versatility
If compression springs are used to overcome angular limitation, then better balance is offered over the entire range of travel, but drift or falling under gravity still occurs
Solution Approach 1:
The patent combines multiple compression springs in a coordinated arrangement where their forces work together to maintain balance. This merging of multiple force-generating elements creates a more reliable system that prevents drift and falling under gravity while maintaining balance across the entire range of travel.
Solution Approach 2:
The spring-based system provides continuous gravitational counteraction that automatically adjusts to maintain equilibrium. The elastic force of the springs responds to positional changes and gravitational effects in real-time, providing feedback-based stabilization that prevents drift and falling without requiring active control.
4Reliability
If brakes are added to prevent drifting or falling, then safety is improved, but device complexity increases
Solution Approach 1:
The spring-based counterbalance system is self-regulating and automatically maintains equilibrium without requiring external braking mechanisms. The elastic forces of the springs inherently prevent drift and falling, making the system self-sufficient for safety and eliminating the need for additional brake components.
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 dual spring counterbalance assembly effectively maintains equilibrium torque across the entire range of motion, reducing the risk of drifting and falling, and eliminates the need for counterweights, resulting in a more compact and accessible mechanical arm design with reduced power requirements.
Implementation Method 1
a first spring and a second spring; the relationship of the first spring to the second spring and the first cam to the second cam being preserved throughout rotation of the joint
Implementation Method 2
counteract the force of gravity for hinged and/or articulated arm
Data Source
AI summary
A mechanical arm assembly comprises an arm rotatable about a pivot, a first force generating device for maintaining the arm at a datum, and a second force generating device for compensating for the first generating device to maintain the arm in positions other than the datum.