Hand-held Power Tool Rotary Percussion Switch-off Mechanism
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Solution Overview
Problem
Existing hand-held power tools lack a seamless transition between rotary percussion and hammer percussion operations, leading to inefficient energy transfer and limited versatility in tool usage.
Innovation Solution
Incorporating a rotary percussion switch-off device that interrupts the transfer of rotary percussions during hammer percussion operations, along with a striker catch device for secure rotational fixation during hammer percussion, and a rotary drive shaft for versatile operating modes, allowing efficient energy transfer and mode switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the striker continuously transfers rotary percussions to the output unit, then rotary percussion operation is maintained, but hammer percussion operation cannot be performed
Solution Approach 1:
The rotary percussion receiver is designed with dynamic engagement and disengagement capabilities. During rotary percussion operation, the receiver is rotationally fixed to the output unit to establish mechanical connection. During hammer percussion operation, the receiver is disengaged from the output unit, allowing the striker to deliver hammer percussion pulses directly. This dynamic reconfiguration enables versatile operation modes without requiring a completely separate mechanism for each function.
Solution Approach 2:
The power tool device is segmented into distinct functional components: the striker, the rotary percussion receiver, and the output unit. The striker can operate independently to deliver hammer percussion pulses when the rotary percussion receiver is disengaged. This segmentation allows the same striker to serve dual purposes - rotary percussion through the receiver and hammer percussion directly - thereby achieving operation mode switching without adding significant device complexity.
2Adaptability or versatility
If the striker is used for both rotary and hammer percussion, then versatility is improved, but energy transfer efficiency may be compromised
Solution Approach 1:
The rotary percussion receiver acts as an intermediary component that selectively mediates energy transfer from the striker to the output unit. During rotary percussion operation, the receiver is engaged to transfer rotary percussion pulses efficiently. During hammer percussion operation, the receiver is disengaged, allowing direct energy transfer from the striker to the output unit. This intermediary mechanism ensures optimal energy transfer efficiency for each specific operation mode while maintaining striker versatility.
Data Source
AI summary
A hand-held power tool device is described which includes an output unit, a striker, and a rotary percussion receiver which is designed for establishing a transfer of rotary percussions between the striker and the output unit, at least during a rotary percussion operation. It is provided that the hand-held power tool device includes a rotary percussion switch-off device which is designed for interrupting the transfer of rotary percussions from the striker to the rotary percussion receiver, at least during a hammer percussion operation.