Cordless Concrete Screed Power Unit for Precise Single-Operator Control
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Solution Overview
Problem
Conventional powered concrete forming tools are bulky, heavy, and difficult to transport and operate precisely, often requiring multiple operators and lacking robust operator control features, which leads to premature wear and damage.
Innovation Solution
A cordless electrical power unit for a concrete screed that includes a frame with a drive housing, a powered drive with an electric motor and battery, and a drive shaft connected to a rotatable drum, allowing for manual advancement and precise operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional powered concrete forming tools use internal combustion engines or hydraulic power sources, then they provide sufficient power for concrete forming operations, but they become bulky and heavy making them difficult to transport and operate precisely
Solution Approach 1:
The patent replaces internal combustion engines and hydraulic power sources with an electric motor powered by a battery pack. This substitution eliminates the need for fuel tanks, exhaust systems, and hydraulic fluid reservoirs, dramatically reducing the tool's weight and bulk while providing sufficient power for concrete forming operations through electric motor torque.
Solution Approach 2:
The patent changes the power source parameters from mechanical/hydraulic systems to electrical systems. The battery-powered electric motor provides comparable power output to conventional systems but with significantly reduced weight and improved maneuverability, allowing single-operator use instead of requiring multiple operators.
2Ease of operation
If conventional powered screeds have lateral shiftable handles for operator control, then operators can hold and advance the screed, but lateral shifting causes manipulation difficulties and increases likelihood of damage
Solution Approach 1:
Instead of having handles that shift laterally relative to the drum axis, the patent inverts the control mechanism by providing a telescoping handle that moves axially (in and out) while maintaining fixed lateral positioning. This eliminates lateral shifting that causes manipulation difficulties and damage, while the axial telescoping motion provides the necessary adjustment for operator comfort and control.
Solution Approach 2:
The patent makes the handle telescoping to provide dynamic adjustment capability. The handle can extend and retract axially to accommodate different operator heights and working positions, while the telescoping mechanism is designed to be smooth and controlled, preventing sudden movements that could cause damage during operation.
3Strength
If conventional powered tools are designed for power and durability, then they can handle harsh operating conditions, but they lack robust operator control features leading to premature wear and damage
Solution Approach 1:
The patent segments the control system into distinct functional components: a telescoping handle for positioning, a trigger mechanism for power control, and a fixed lateral connection to the drum. This segmentation allows each component to be optimized for its specific function - the handle for ergonomic control, the trigger for precise power modulation, and the fixed connection for structural reliability - preventing premature wear and damage while maintaining operator control precision.
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 cordless power unit enables easier transportation and more precise operation of the concrete screed, reducing operator fatigue and the risk of damage, while providing robust control features for efficient concrete grading and finishing.
Implementation Method 1
The powered drive includes an electric motor and a battery operably coupled to the electric motor and configured to power the electric motor
Implementation Method 2
The powered drive includes an electric motor and a battery operably coupled to the electric motor and configured to power the electric motor
Data Source
AI summary
A power unit is configured for use as part of a concrete screed and includes a frame and a powered drive. The frame includes a drive housing. The powered drive is operably supported by the drive housing and is configured to rotate a rotatable concrete forming drum. The powered drive includes an electric motor and a battery operably coupled to the electric motor and configured to power the electric motor. The powered drive includes a drive shaft drivingly connectable relative to the drum, with rotation of the drive shaft causing corresponding rotation of the drum.