Four-Bar Mechanical Limiter to Prevent Balance Arm Load Drop
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Solution Overview
Problem
Existing balance arm systems in hospital equipment lack a mechanical limiting mechanism to prevent loads from falling due to spring failure, such as mechanical spring fatigue or disconnection, which is crucial for meeting medical device testing standards.
Innovation Solution
A mechanical limiting mechanism comprising a swivel base, spring arm, reinforcing arm, and loading part forming a four-bar linkage, where the spring arm and reinforcing arm interact to limit movement when the spring fails, preventing the load from falling without additional parts, by adjusting the size of the spring and reinforcing arms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical limiting mechanism is added to prevent load falling, then safety and reliability are improved, but device complexity increases
Solution Approach 1:
The limiting mechanism is merged with the existing balance arm system by integrating the reinforcing arm into the four-bar linkage structure. The reinforcing arm shares common pivot points (first pivot and third pivot on swivel base, second pivot and fourth pivot on loading part) with the spring arm, combining the limiting function with the existing suspension mechanism rather than adding separate independent components.
Solution Approach 2:
The reinforcing arm serves multiple functions: it acts as both a structural component of the four-bar linkage mechanism and a limiting element. The same reinforcing arm that provides structural support also prevents excessive downward movement of the loading part when the spring fails, achieving multi-functionality with a single component.
2Adaptability or versatility
If the size of spring arm and reinforcing arm is adjusted to change limiting height, then adaptability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The limiting height is adjusted by changing the geometric parameters (size) of the spring arm and reinforcing arm. By modifying dimensions such as the length of the arms or the position of pivot points, different limiting heights can be achieved. This allows the mechanism to adapt to different load weights and application requirements through parameter adjustment rather than requiring completely different structural designs.
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 mechanism effectively prevents loads from falling by utilizing a four-bar linkage mechanism, ensuring safety without additional components and allowing for adjustable limiting heights through simple structural adjustments.
Implementation Method 1
A balance arm system is a device that relies on springs (mechanical springs or gas springs) to balance a load at an end
Implementation Method 2
functional spring components of the balance arm system have a high reliability within the allowable design load weight
Implementation Method 3
a spring arm, and wherein a first end of the spring arm is connected to the swivel base; a loading part for carrying a load, wherein a second end of the spring arm is connected to the loading part; and a reinforcing arm, wherein a first end of the reinforcing arm is connected to the swivel base, and a second end of the reinforcing arm is connected to the loading part, so that the spring arm, the swivel base, the reinforcing arm and the loading part constitute a four-bar linkage mechanism
Data Source
AI summary
A mechanical limiting mechanism comprises a swivel base, a spring arm, a loading part and a reinforcing arm. The spring arm, the swivel base, the reinforcing arm and the loading part constitute a four-bar mechanism, the loading part moves up and down through the rotation of the spring arm, and a limiting is realized through a contact of the spring arm and the reinforcing arm. When the spring arm and the reinforcing arm drive the loading part to move downwards, after the spring arm is abutted against the reinforcing arm, the four-bar linkage mechanism cannot rotate, a mechanical limiting is realized, and the loading part can be prevented from falling. There is no need to add additional parts, and different height changes of the limiting are realized only by adjusting the size of the spring arm and/or the size of the reinforcing arm.