Power Tool Gearbox Actuator Locking for Stable Speed Switching
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Solution Overview
Problem
Manual machine tools with complex constructions require precise adjustments of gearbox speed ratios, which can be cumbersome for operators due to the need for manual actuation and stable positioning of actuating parts.
Innovation Solution
A locking arrangement with a control surface arrangement featuring gliding surfaces and vertices is introduced, allowing the actuating part to be locked in stable positions automatically, enabling easy adjustment of gearbox switch positions through a toggle-like mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual actuation of gearbox switching elements is used, then the operator can adjust speed ratios, but the operator must precisely position actuating parts which increases operating complexity and time
Solution Approach 1:
The locking part automatically locks into locking indentations at defined actuating positions without requiring manual intervention for positioning. The control surface arrangement with vertices and gliding surfaces guides the locking part into stable positions autonomously, eliminating the need for the operator to precisely position the actuating part.
Solution Approach 2:
The patent replaces the traditional mechanical cam guide system with a control surface arrangement featuring vertices and gliding surfaces. This new mechanical system uses the geometry of the control surface to automatically guide and lock the actuating part into defined positions, simplifying the operator's task.
2Adaptability or versatility
If complex construction with multiple switching gear elements is used, then multiple speed ratios can be achieved, but the actuating device construction becomes complex and difficult to operate
Solution Approach 1:
The patent combines multiple switching gear elements and their actuation mechanisms into a single integrated actuating part with a unified control surface arrangement. This merging reduces the number of separate components and simplifies the overall construction while maintaining the capability to achieve multiple speed ratios.
Solution Approach 2:
The actuating part serves multiple functions: it actuates multiple switching gear elements simultaneously and incorporates the locking mechanism with control surface arrangement. This multi-functionality reduces the need for separate actuating mechanisms for each switching element, simplifying the device construction.
Data Source
AI summary
A manual machine tool having a drive motor, a gearbox and a tool holder, wherein a motor output of the drive motor having a gearbox drive of the gearbox and a gearbox output of the gearbox are coupled to the tool holder in a manner which permits rotation, wherein the manual machine tool has an actuating device to adjust the gearbox between its switch positions, wherein the actuating device has an actuating part which is movably mounted between actuating positions relative to a machine housing of the manual machine tool and which can be manually actuated, which actuating part is coupled to the at least one switching gear element to set the switch positions. The actuating device has a locking arrangement with locking indentations arranged on a locking structure to lock the actuating part in the actuating positions, which locking indentations are assigned to actuating positions of the actuating part, and with a locking part to engage in the locking indentations.