Impact Tool Lever Assembly for Smooth Mode Switching
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Solution Overview
Problem
Existing work tools and impact tools face issues with smooth mode switching due to the deviation of pins from the axis of the internal gear, leading to potential slipping or switching failure, and the difficulty in joining a highly rigid shift arm.
Innovation Solution
A work tool and impact tool design featuring a lever member that is swingable about a support shaft with an elongated hole for the shaft, allowing for easy joining and smooth mode switching, along with a sleeve member and linkage part for axial movement, enabling efficient operational mode changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shift arm is designed to be highly rigid for reliable mode switching, then switching reliability is improved, but the difficulty of joining the shift arm to projections increases
Solution Approach 1:
The shift arm is designed with a pivotable connection to the support shaft, allowing it to dynamically adjust its position during operation. This dynamic design enables the shift arm to accommodate manufacturing tolerances and join easily to the support shaft while maintaining reliable mode switching functionality throughout its range of motion
2Ease of operation
If pins are positioned to engage with the internal gear, then mode switching is enabled, but the pins deviate from the gear axis causing slipping or switching failure
Solution Approach 1:
The support shaft acts as an intermediary element between the shift arm and the internal gear. It provides a stable rotational axis that ensures the pins engage with the internal gear teeth at the correct position, preventing deviation and eliminating slipping or switching failure while enabling smooth mode transitions
Data Source
AI summary
A work tool switches smoothly between operational modes and has a lever member that is easily joined. The work tool includes an operation member, a lever member, and a switching member. The lever member is swingable about a support shaft in response to an operation on the operation member and is swingable with the support shaft placed through the lever member. The lever member has an elongated hole through which the support shaft is placed. The elongated hole extends along the lever member. The switching member is linked with a swing of the lever member to move linearly.