Cut-length indicating device guide unit integration
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Solution Overview
Problem
Existing cut-length indicating devices for hand power tools, such as plunge-cut circular saws, face mechanical stress due to floating cabling, leading to reduced service life as electric power cables are subjected to high mechanical load during movement.
Innovation Solution
The guide unit and electric power supply unit are designed to be partially integral, with a sliding-action contact unit that includes a linear guide element and a plain bearing bush element, allowing for a durable electrical connection through a stationary current conduction element, reducing mechanical stress on soldered connections and enabling simple electrical implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If floating cabling is used to supply electric current to movably mounted indicating elements, then the indicating elements can be positioned flexibly during movement, but the electric power cables are subjected to high mechanical load leading to reduced service life
Solution Approach 1:
The guide unit and electric power supply unit are merged into a partially integral structure where the guide element serves dual functions as both a mechanical guide and a current conduction element. This integration eliminates the need for separate floating cabling, reducing mechanical stress on electrical connections while maintaining flexible positioning of indicating elements through the guide unit's movement capabilities.
2Ease of operation
If separate floating cabling is used for electrical connection, then the indicating elements can move independently, but the soldered connection points are subjected to high mechanical load
Solution Approach 1:
The guide element is merged with the current conduction element, creating a unified structure where mechanical guidance and electrical current transmission occur through the same component. This eliminates separate soldered connections for power supply, as the guide element itself conducts current to the indicating elements during movement.
Solution Approach 2:
The guide element performs multiple functions simultaneously: it provides mechanical guidance for the indicating elements, enables their movement along a defined path, and serves as the current conduction element for supplying electric power. This multi-functionality eliminates the need for separate floating cabling and reduces mechanical stress on electrical connections.
3Ease of manufacture
If guide unit and electric power supply unit are designed separately, then each unit can be optimized independently, but the device complexity increases and service life decreases
Solution Approach 1:
The guide unit and electric power supply unit are integrated into a partially integral structure where the guide element serves as both a mechanical guide and a current conduction element. This reduces the number of separate components and connections needed, simplifying the overall device structure while maintaining the ability to function as both a guide mechanism and power supply system.
Data Source
AI summary
A cut-length indicating device for a hand power tool includes at least one guide unit configured to moveably guide at least one movably mounted and electrically operated indicating element. The device also includes at least one electric power supply unit configured to supply electric current to the at least one indicating element. The at least one guide unit and the at least one electric power supply unit are configured so as to be partially integral with each other.