Resiliently Suspended Vibrator Mechanism for Concrete Finishing Tools
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Solution Overview
Problem
Existing concrete finishing tools lack a self-contained, optimally positioned vibration mechanism that allows for variable and controlled vibration, which is essential for achieving a smooth surface and preventing cracking in concrete slabs.
Innovation Solution
A vibration imparting device with a housing containing a vibrator and battery, where the vibrator is resiliently suspended using a collar and anchored within the housing, and connected to the handle and terminus of the tool via adaptors, allowing for remote control and variable speed operation, and utilizing a rotor with an eccentric weight to generate vibrations transmitted through a resilient band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a vibration mechanism is added to concrete finishing tools, then the surface smoothness and cracking prevention are improved, but the device complexity and weight increase
Solution Approach 1:
The vibration mechanism is nested within the handle structure of the concrete finishing tool. The housing contains both the vibrator and battery, with the vibrator positioned within a chamber formed by the housing inner surface. This nesting approach integrates the vibration function into the existing tool structure without requiring separate external components.
Solution Approach 2:
The patent combines multiple functions into a single integrated unit: the housing simultaneously provides structural support, contains the vibrator, accommodates the battery, and serves as the handle structure. The vibrator and power source are merged into one self-contained assembly that attaches to the finishing tool.
2Manufacturing precision
If a vibration mechanism is added to concrete finishing tools, then the surface smoothness and cracking prevention are improved, but the weight of the tool increases
Solution Approach 1:
The vibration mechanism components are nested within the existing handle structure. The housing is sized to accommodate both the vibrator and battery within the handle volume, utilizing space that would otherwise be empty or underutilized in the tool structure.
3Device complexity
If the vibrator is directly mounted to the housing, then the structural simplicity is improved, but the vibration transmission efficiency and control are worsened
Solution Approach 1:
A resilient collar acts as an intermediary between the vibrator and the housing. The collar surrounds and contacts the vibrator within the housing chamber, forming a spaced relationship that allows controlled vibration transmission while isolating the vibrator from direct rigid mounting to the housing inner surface.
Solution Approach 2:
The resilient collar changes the mechanical coupling parameter between the vibrator and housing from rigid to flexible. This allows the vibrator to operate with optimal vibration characteristics while the collar provides controlled interaction with the housing structure.
4Volume of stationary object
If the battery is placed directly against the housing wall, then the space utilization is improved, but the battery damage due to vibration is worsened
Solution Approach 1:
A spacer is interposed between the battery and the housing inner wall before the vibration mechanism operates. This spacer provides protective cushioning that prevents direct contact between the battery and the vibrating housing wall, protecting the battery from vibration-induced damage while maintaining compact space utilization.
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 device provides efficient and controlled vibration to concrete finishing tools, ensuring a smooth surface and preventing cracking, while being lightweight, easy to retrofit, and maintain, and adaptable for various tool types.
Implementation Method 1
The resilient collar forms a spaced relationship between the vibrator and the housing inner surface within the chamber
Implementation Method 2
The rotor also includes a shaft that extends outwardly from the rotor, as well a weighted body that is connected to the rotor apart from the shaft, producing vibration
Implementation Method 3
Vibrations are transmitted to the housing from the rotor via such resilient band
Implementation Method 4
The housing is sized to accommodate a vibrator and an electrical battery to provide electrical power to the vibrator
Data Source
AI summary
A remote controlled vibration imparting device for a concrete finishing tool uses a housing having a chamber surrounded by an inner surface of the housing. A vibrator with a support, a rotor with a shaft and weighted body, a motor, and a resilient link between the shaft and the motor is positioned within the housing chamber. The vibrator also includes a resilient band to separate the vibrator from the housing inner surface. First and second adaptors are employed for the housing to be placed between the handle and the terminus of a concrete finishing tool.