Angle Grinder Switching Pawl and Cam Guide for Safe Activation
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Solution Overview
Problem
Existing power tools, particularly angle grinders, lack ergonomic and user-friendly switching mechanisms that ensure safe operation while meeting legal requirements and standards.
Innovation Solution
A switching unit design featuring a movably mounted switching pawl element guided by a cam guide element, with a releasing element pivotably mounted on the pawl element, allowing a combined linear and pivoting movement, and a pivot axis perpendicular to the pawl's main direction, enhancing ergonomic operation and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple switching mechanism is used, then the device complexity is reduced, but the reliability and safety of operation deteriorates due to accidental activation
Solution Approach 1:
The switching mechanism is divided into separate functional components: a switching pawl element for actuation, a releasing element for unlocking, and a guide element for defining movement paths. This segmentation allows each component to perform its specific function reliably while maintaining overall system safety without requiring excessive complexity.
Solution Approach 2:
The guide element acts as an intermediary between the switching pawl element and the releasing element, mediating their interaction through a predefined cam track. This intermediary structure ensures that the releasing element can only unlock the pawl at the correct moment in the movement cycle, preventing accidental activation while maintaining operational simplicity.
2Reliability
If a complex switching mechanism with multiple components is used, then the reliability and safety are improved, but the ease of operation deteriorates due to difficult manipulation
Solution Approach 1:
The releasing element is pivotably mounted directly on the switching pawl element, merging the unlocking function with the actuated component. This integration allows the user to operate the release with the same hand motion that activates the switch, maintaining ease of operation while ensuring reliable locking through the combined movement of the pawl and release elements.
Solution Approach 2:
The switching mechanism employs dynamic movement paths defined by the cam guide element, where the pawl element follows a predetermined curved trajectory. This dynamic design automatically guides the user's hand through the switching motion, making the operation intuitive and easy to perform while maintaining reliable engagement and disengagement of the locking mechanism.
3Ease of operation
If the releasing element is mounted on the switching pawl element, then the ease of operation is improved through direct connection, but the device complexity increases due to additional mounting requirements
Solution Approach 1:
The pivot mounting structure serves multiple functions simultaneously: it provides the rotational axis for the releasing element, defines the relative position between the pawl and release, and guides the interaction between the two components during operation. This multi-functional mounting approach improves ease of operation while avoiding the need for separate complex mounting mechanisms.
Data Source
AI summary
A power tool, in particular an angle grinder, is disclosed which has at least one switching unit which has at least one movably mounted switching pawl element, at least one guide element, in particular a cam guide element, for guiding the switching pawl element in a defined movement, and at least one releasing element pivotably mounted on the switching pawl element for unlocking a movement lock of the switching pawl element. The releasing element has at least one pivot axis extending at least essentially perpendicular to a main direction of movement of the switching pawl element and at least essentially perpendicular to a longitudinal extension direction of the switching pawl element.