Handle Lock Switch Layout to Prevent Dirt-Induced Misoperation
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Solution Overview
Problem
Hand-held working devices often malfunction due to incorrect actuation of switches, particularly caused by contamination in the handle, which impairs the function of the switching element and prevents the release of a necessary signal for operation.
Innovation Solution
The design includes a switch positioned between the locking element and the underside of the handle section, aligned to prevent dirt from accumulating on the switching element, with a locking element and control circuit that ensures the drive motor is only released when the switch sends a valid signal, and features like a cranked end section and cleaning opening to maintain cleanliness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the switch is positioned in the handle section with the switching element facing upward, then the switch is easily accessible and simple to operate, but contamination accumulates on the switching element causing malfunctions
Solution Approach 1:
The patent inverts the conventional orientation of the switching element by positioning it to face downward toward the underside of the handle section instead of upward. This inversion causes contamination to fall away from the switching element due to gravity, preventing accumulation on the critical contact surfaces while maintaining operational functionality.
2Reliability
If the locking element is positioned on the upper side of the handle section, then it provides a secure locked position, but dirt particles can enter and contaminate the switching element
Solution Approach 1:
The patent introduces the handle section underside as an intermediary protective barrier between the locking element mechanism and the switching element. This intermediate structure prevents direct exposure of the switching element to contaminants that would otherwise enter from above when the locking element is positioned on the upper side of the handle section.
3Reliability
If the switch is positioned below the locking element, then the switching element is protected from contamination, but the switch structure becomes more complex
Solution Approach 1:
The patent merges the protective function with the structural design by integrating the switching element orientation directly into the handle section geometry. The downward-facing switching element is positioned within the natural profile of the handle section, combining contamination protection with the existing structural form rather than adding separate protective components.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a hand-held power tool. The power tool comprises an actuating element (8) for actuating the drive motor (3), a locking element (9) arranged on the upper side (6) of the handle section (5), wherein the locking lever (9) is operatively connected to the actuating element (8), a control circuit (17) for controlling the drive motor (3), and a switch (15) with a switching element (16) that can be actuated via the locking element (9), wherein the switch (15) sends a signal to the control circuit (17) when activated. The switch (15) is arranged in the handle section (5) between the locking element (9) and the underside (7) of the handle section (5) and is oriented such that the switching element (16) of the switch (15) faces the underside (7) of the handle section (5).