Multi-Speed Hand Tool Gearbox With Linked Switching Elements
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Solution Overview
Problem
Manual machine tools with four-speed gearboxes require complex actuating devices to control multiple switching gear elements individually, leading to cumbersome operation and increased complexity.
Innovation Solution
The gearbox design incorporates a switch actuator from the first gear wheel arrangement that directly influences the second gear wheel arrangement, allowing for simultaneous adjustment between two switch positions without the need for separate actuation of each gear element, simplifying the actuation device and reducing the number of necessary components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple switching gear elements are controlled individually by separate actuating devices, then each gear element can be switched independently, but the actuating device becomes complicated and the operation becomes cumbersome
Solution Approach 1:
The patent combines multiple switching gear elements (first switching gear element and second switching gear element) into a single integrated switching mechanism. The first switching gear element is designed to simultaneously engage with both the first gear wheel arrangement and the second gear wheel arrangement, allowing a single actuating device to control multiple gear elements together rather than requiring separate actuating devices for each element.
Solution Approach 2:
The first switching gear element is designed with multi-functionality to serve dual purposes: it acts as both the switching element for the first gear wheel arrangement and as the actuator for the second gear wheel arrangement. This universal design allows one component to perform multiple switching functions that previously required separate dedicated components.
2Ease of operation
If a deflection gear is used to convert rotational movement to linear movement for switching, then the switching gear element can be actuated, but additional components and housing openings are required
Solution Approach 1:
The patent extracts and eliminates the deflection gear component from the switching mechanism. Instead of using a deflection gear to convert rotational movement to linear movement, the design allows the switching gear element to be directly adjusted in the linear direction along the setting axis through the gear wheel arrangements, removing the need for this intermediate conversion component and its associated housing openings.
Solution Approach 2:
The gear wheel arrangements serve as intermediaries that directly translate the switching action into the necessary linear movement of the switching gear element along the setting axis, eliminating the need for the deflection gear as a movement conversion intermediary.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design simplifies the operation of manual machine tools by allowing the switching gear element of the first gear wheel arrangement to act as a switch actuator for the second, reducing the complexity of the actuation device and eliminating the need for additional housing openings, resulting in easier and more straightforward gear switching.
Implementation Method 1
The switching gear element of the first gear wheel arrangement forms a switch actuator for the second gear wheel arrangement to switch the gearbox between at least two of the switch positions
Data Source
AI summary
A manual machine tool having a drive motor, a gearbox arranged on a gearbox housing and a tool holder, wherein a motor drive of the drive motor with a gearbox drive of the gearbox and a gearbox output of the drive that is rotatable about an axis of rotation are coupled to the tool holder in a manner which permits rotation, wherein the gearbox can be switched between at least two switch positions in which the speed ratios between the gearbox drive and the gearbox output are different from one another, wherein the gearbox comprises a first wheel arrangement and at least a second wheel arrangement, each of which have at least one gear wheel and a switching gear element, wherein in both gear wheel arrangements the at least one gear wheel on the switching gear element and/or the switching gear element on at least one gear wheel can roll and the respective switching gear element is mounted in a locally adjustable manner to adjust the switch settings of the gearbox on the gearbox holding structure between the at least two setting positions and/or can be adjusted relative to the gearbox holding structure (44A) between an immobile position and a mobile position.