Hand-held Tool Lock Mechanism Positioning
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Solution Overview
Problem
Existing hand-held disk grinders face operability issues due to the difficulty in viewing and accessing the operation member for locking and unlocking the grinding wheel cover, requiring a tool for position changes which complicates the grinding operation.
Innovation Solution
A hand-held tool design featuring a lock mechanism with an operation member positioned on the opposite side of the gear head device, allowing remote operation and easy viewing, which includes a lock claw, biasing member, and slider for compact and reliable locking and unlocking of the grinding wheel cover without the need for additional tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operation member is positioned at or in the vicinity of the grinding wheel cover support portion, then the lock mechanism can be compact, but it becomes difficult for the operator to view and access the operation member
Solution Approach 1:
The operation member is repositioned from the conventional location at the grinding wheel cover support portion to a different spatial location on the tool body. This dimensional relocation allows the operator to easily view and access the operation member while maintaining the compactness of the lock mechanism through the coupling device that connects the remotely positioned operation member to the locking mechanism.
2Ease of operation
If a fixing screw tightening type structure is used to change the position of the grinding wheel cover, then the cover can be securely fixed, but the position changing operation becomes troublesome requiring a screwdriver
Solution Approach 1:
The lock mechanism is designed to be operated directly by the user's hand without requiring external tools. The operation member can be manually actuated to lock and unlock the grinding wheel cover position, making the system self-servicing and eliminating the need for screwdrivers or other tooling while maintaining secure fixation through the lock mechanism.
3Ease of operation
If the operation member is positioned remotely from the grinding wheel cover, then it becomes easy to view and access, but the coupling device becomes more complex
Solution Approach 1:
A coupling device serves as an intermediary mechanism that connects the remotely positioned operation member to the lock mechanism. This coupling device transmits the operational force from the distant operation member to the locking mechanism, enabling remote operation while keeping the coupling structure relatively simple through direct mechanical linkage.
Data Source
AI summary
A hand-held tool has an operation member operably coupled to a lock mechanism. The lock mechanism can lock and unlock the position of a cover that covers at least a part of an end tool. The operation member is positioned on an opposite side to a coupling device that movably couples the cover to a gear head device mounted to a tool body.