Cordless Concrete Screed Power Head With Cam Trigger Actuation
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Solution Overview
Problem
Conventional powered concrete roller screeds often require a remote power source, limiting mobility and efficiency, as they rely on corded electric or gas motors, which can be cumbersome and restrict worker movement.
Innovation Solution
A cordless, battery-operated power head with a handle and driver housing, featuring a translatable link and eccentric cam mechanism that actuates a trigger to rotate the output shaft, allowing independent operation without a remote power source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a corded electric motor or gas motor is used to power the screed roller, then the power source is reliable and continuous, but the worker's mobility is restricted and the equipment becomes cumbersome
Solution Approach 1:
The patent replaces the mechanical power transmission system (electrical cord or gas fuel supply) with a battery-powered electric motor system. The cordless driver housing contains a battery pack that provides electrical power directly to the motor, eliminating the need for external fuel tanks, electrical cords, or complex power transmission mechanisms, thereby achieving both reliability and mobility.
Solution Approach 2:
The power head is segmented into distinct functional modules: the driver housing containing the battery and motor, the handle for operator control, and the screed roller assembly. This modular segmentation allows each component to be optimized independently and facilitates easier handling and positioning by workers.
2Duration of action of stationary object
If a remote power source is used, then continuous power supply is ensured, but the equipment complexity and setup requirements increase
Solution Approach 1:
The patent merges the power source (battery pack), power conversion system (motor), and control mechanisms into a single integrated driver housing. This consolidation eliminates the need for separate power supply equipment, extension cords, or external control systems, reducing overall equipment complexity while maintaining continuous operational capability.
Solution Approach 2:
The cordless driver is designed as a self-contained unit where the battery pack provides autonomous power without requiring external connections or infrastructure. The integrated design allows the equipment to service itself, eliminating dependencies on remote power sources, fuel stations, or electrical outlets.
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
Enables greater mobility and efficiency in concrete finishing by providing a self-sufficient, portable power source that can rotate the screed roller without the need for a remote power connection, reducing the burden on workers and improving workflow.
Implementation Method 1
an eccentric cam. The eccentric cam is operatively connected to the translatable link within the drive housing such that translation of the translation link imparts rotation of the eccentric cam about a rotational axis of the eccentric cam to an actuated position
Data Source
AI summary
A power head for a powered concrete roller screed includes a handle and a driver housing at a distal end of the handle. A cordless, battery-operated driver is received in the driver housing. A head actuator includes a translatable link extending along the handle and an eccentric cam. The eccentric cam is operatively connected to the translatable link within the drive housing such that translation of the translation link imparts rotation of the eccentric cam about a rotational axis of the eccentric cam to an actuated position. The eccentric cam is adjacent a trigger of a cordless, battery-operated driver and is configured to depress the trigger when the eccentric cam is rotated about its rotational axis to the actuated position.