Power Tool Switch Locking for Hands-Free Active Operation
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Solution Overview
Problem
Hand-held power tools with SDSplus tool holders face challenges in maintaining an active operating mode independently of operator activation force, leading to ergonomic issues and safety risks during prolonged use, especially when handling heavy tools or performing tasks that require sustained effort.
Innovation Solution
Incorporating a locking unit with timer function, acoustic pick-up element, movement characteristic variable pick-up, sensor units for safety monitoring, and a communication interface to maintain the active operating mode automatically or through voice and gesture control, ensuring continuous operation without manual actuation and enhancing safety features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional switch device is used that requires continuous operator activation, then the tool can be operated, but operator fatigue increases and ergonomic performance deteriorates during prolonged use
Solution Approach 1:
The locking unit is pre-configured to automatically maintain the active operating mode once activated. The operator performs the preliminary action of activating the mode, and the locking unit takes over to maintain it automatically, eliminating the need for continuous manual activation and reducing operator fatigue during prolonged use
2Ease of operation
If the tool is designed to maintain active operating mode automatically, then operator fatigue is reduced, but the device complexity increases due to additional locking mechanisms
Solution Approach 1:
The locking unit is merged with the existing switching element and switch device structure. The locking mechanism integrates with the switching element's housing and utilizes the same actuation space, combining multiple functions (switching and locking) into a unified structure rather than adding separate independent components
3Productivity
If continuous operation mode is enabled, then productivity increases, but safety risks increase due to potential unintended activation
Solution Approach 1:
The switching element can be dynamically positioned in multiple states: deactivated, activated, and locked in activated mode. The locking unit provides a distinct locked position that maintains activation without requiring continuous pressure, allowing the tool to adapt its operational state based on the operator's input while maintaining safety through clear state differentiation
4Ease of operation
If a locking unit is added to maintain operating mode, then ease of operation improves, but the manufacturing cost and manufacturing complexity increase
Solution Approach 1:
The locking unit serves multiple functions: it maintains the active operating mode, provides tactile feedback to the operator about the locked state, and integrates with the existing switching element structure. This multi-functionality reduces the need for additional separate components and simplifies the overall manufacturing process
Data Source
AI summary
The disclosure is based on a hand-held power tool having at least one switch device which comprises at least one switching element at least for activating a power supply of a drive unit, having at least one quick-change tool holder which is provided for holding an insertion tool which is different from an insertion tool with an SDS® shaft having a maximum transverse extent of 10 mm and/or having at least one accumulator interface. It is proposed that the at least one switching device comprises at least one locking unit which is provided for maintaining, at least essentially independently of an effect of an operator activation force, an active operating mode which can be activated by actuating the at least one switching element.