Vibration Isolating Joint for Construction Tool Handle
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Solution Overview
Problem
Walk-behind construction equipment, such as plate compactors, transmit significant vibrations to operators, leading to operator fatigue and discomfort due to the lack of effective vibration isolation in existing handles.
Innovation Solution
The proposed handle design incorporates a vibration isolating joint between the handlebar and the upper handle portion, a counterweight assembly within the upper handle portion to attenuate vibrations, and a secondary handlebar with independent degrees of freedom relative to the primary handlebar, providing multiple mechanisms to reduce vibration transmission to the operator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid handle structure is used to provide stable control, then handling stability is improved, but vibration transmission to the operator increases causing fatigue
Solution Approach 1:
The handle structure is divided into multiple segments (lower handle portion, upper handle portion, handlebar) connected by joints. The vibration isolating joint segments the vibration transmission path, allowing each segment to independently absorb and isolate vibrations while maintaining overall structural stability for control.
Solution Approach 2:
A vibration isolating joint is introduced as an intermediary element between the upper handle portion and the handlebar. This joint acts as a mediator that decouples the rigid handle structure from vibration transmission, allowing the handle to maintain structural integrity while filtering out harmful vibrations through its degree of freedom movements.
2Object-affected harmful factors
If a vibration isolating joint with multiple degrees of freedom is added to reduce vibrations, then vibration isolation is improved, but device complexity increases
Solution Approach 1:
The vibration isolating joint is designed with multiple degrees of freedom that allow dynamic movement in different directions. This dynamic capability enables the joint to adapt to multi-directional vibrations and absorb them through controlled movements, achieving effective vibration isolation without requiring an overly complex rigid structure.
Solution Approach 2:
The joint's degrees of freedom are designed to provide specific movement capabilities (first and second degrees of freedom) that change the mechanical parameters of the handle system. This allows the joint to modify vibration transmission characteristics by enabling controlled movements that counteract incoming vibrations, achieving isolation through parameter modification rather than structural complexity.
3Object-affected harmful factors
If a counterweight assembly is added to attenuate vibrations, then vibration reduction is improved, but handle weight increases
Solution Approach 1:
A counterweight assembly is incorporated into the upper handle portion to counteract vibrations generated during operation. The counterweight uses gravitational force and inertial effects to attenuate vibrations transmitted to the handlebar, reducing vibration amplitude without requiring excessive weight by strategically positioning the counterweight to work against the harmful vibrational forces.
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 handle design significantly reduces operator fatigue by effectively isolating vibrations, allowing for more comfortable and efficient operation of construction equipment by minimizing the impact of vibrations on the operator.
Implementation Method 1
a vibration isolating joint positioned between the handlebar and the upper handle portion. The vibration isolating joint isolates the handlebar from vibration transmitted to the upper handle portion from the construction tool
Implementation Method 2
a counterweight assembly disposed within the upper handle portion and configured to attenuate vibration transmitted to the handlebar from the construction tool. The counterweight is configured to reciprocate out of phase with vibration transmitted to the upper handle portion from the construction tool
Data Source
AI summary
A handle for a construction tool includes a lower handle portion configured to be coupled to the construction tool, an upper handle portion coupled to the lower handle portion, a handlebar coupled to the upper handle portion and configured to be grasped by a user during operation of the construction tool, and a vibration isolating joint positioned between the handlebar and the upper handle portion. The vibration isolating joint isolates the handlebar from vibration transmitted to the upper handle portion from the construction tool. The vibration isolating joint provides a first degree of freedom to the handlebar relative to the upper handle portion and a different, second degree of freedom to the handlebar relative to the upper handle portion.