Power Tool Mode-Setting Unit With Integrated Plastic Selector
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Solution Overview
Problem
Conventional hand-held power tools require multiple components for mode-setting units, leading to complexity and potential reliability issues in switching between operating modes like impact drilling, drilling, and screwing.
Innovation Solution
A mode-setting unit formed as a single piece from plastic, with a rotatable actuating and setting element, supported axially on the gear housing, and including a blocking element to securely set and change operating modes, simplifying the support and activation of transmission elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple components are used for mode-setting units, then the mode-setting function can be achieved, but the device complexity increases and reliability decreases
Solution Approach 1:
The actuating element and setting element are merged into a single integrated component formed as one piece from plastic. This single component performs multiple functions: it acts as both the actuating element that transmits rotational movement and the setting element that engages with blocking elements to fix the transmission element in different axial positions. By combining what were previously separate components into one unified element, the patent reduces the number of parts, simplifies the mode-setting unit structure, and improves reliability by eliminating interfaces between multiple components.
2Device complexity
If a single piece structure is used for mode-setting unit, then the number of components is reduced and reliability is improved, but manufacturing complexity may increase
Solution Approach 1:
The single-piece mode-setting unit is designed to perform multiple functions within one component. The actuating element and setting element are integrated, with the setting element incorporating blocking elements that can engage with corresponding features on the transmission element. This multi-functional design allows one component to replace what would traditionally require multiple separate parts, simplifying assembly while maintaining the necessary mode-setting functionality through clever geometric design rather than complex manufacturing processes.
3Adaptability or versatility
If the transmission element is axially displaceable, then mode switching is enabled, but the structure becomes more complex requiring additional support and blocking mechanisms
Solution Approach 1:
The transmission element is designed with dynamic axial displacement capability, allowing it to move between different axial positions corresponding to different operating modes (impact drilling, drilling, screwing). The setting element, integrated with the actuating element, provides dynamic blocking through its blocking elements that can engage or disengage from the transmission element. When the actuating element is rotated, it moves the setting element axially, which in turn blocks or unblocks the transmission element, enabling controlled axial displacement and mode switching without requiring complex external mechanisms.
Data Source
AI summary
In a hand-held power tool including a gear for driving an output shaft, which is situated in an assigned gear housing, and including a mode-setting unit for setting the operating mode for an impact drilling mode, a drilling mode, or a screwing mode, the mode-setting unit including a rotatable actuating element and a rotatable setting element coupled to the rotatable actuating element. The setting element is coupled, at least in one operating mode, to a transmission element which is mounted on the gear housing and is axially displaceable on the gear housing in a screwing position assigned to the screwing mode and is axially fixed on the gear housing in impact drilling and drilling positions assigned to the impact drilling and drilling modes. The actuating element and the setting element are formed as one piece from plastic.