Power Tool Blade Locking Mechanism for Tool-Free Replacement
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Solution Overview
Problem
Existing electric scissors require users to carry and use tools like screwdrivers and wrenches for blade replacement, which is inconvenient and poses safety risks, especially when used outdoors.
Innovation Solution
A blade replacement apparatus that allows users to replace blades without any instruments, featuring a nut loosening/tightening member, a locking member, and an operating member that can be moved between operating and non-operating positions to facilitate hand-operated tightening or loosening of the nut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional bolt and nut fixation is used for blade assembly, then the blade connection is reliable, but the blade replacement requires tools (screwdrivers and wrenches) and is time-consuming
Solution Approach 1:
The operating member is designed to be directly operable by hand without requiring external tools. The user can directly rotate the operating member to loosen or tighten the nut, eliminating the need for wrenches and screwdrivers, thereby enabling tool-free blade replacement and reducing replacement time
Solution Approach 2:
The operating member serves multiple functions: it acts as both a locking mechanism (when in the locked position) and a nut loosening/tightening tool (when rotated). This multi-functionality eliminates the need for separate tools and simplifies the blade replacement process
2Reliability
If traditional bolt and nut fixation is used for blade assembly, then the connection is secure, but the replacement process poses safety risks and parts may be lost
Solution Approach 1:
The locking member is pre-configured with engagement structures that automatically secure the blade assembly when the operating member is in the locked position. This preliminary locking action prevents parts from falling or being lost during the replacement process and eliminates safety risks associated with loose components
Solution Approach 2:
The locking member acts as an intermediary between the operating member and the blade assembly. It provides a controlled interface that ensures proper engagement and disengagement of the blade, preventing accidental drops or loss of small parts during replacement
3Stability of the object's composition
If a locking mechanism is added to prevent accidental rotation, then the blade connection stability is improved, but the device complexity increases
Solution Approach 1:
The locking member is integrated with the operating member and nut loosening/tightening member into a unified assembly. The locking protrusion and engagement groove are formed as part of the same structural component, eliminating the need for separate locking devices and keeping the overall structure simple while providing stable blade assembly
Data Source
AI summary
A blade replacement apparatus is disclosed, including a nut loosening/tightening member, a locking member, and an operating member, wherein one of the nut loosening/tightening member and the operating member is provided with a first matching portion, and the locking member is provided with a second matching portion. The operating member is movable between an operating position and a non-operating position. When the operating member is in the non-operating position, the first matching portion engages with the second matching portion. The locking member and the operating member are rotatable to one another. Rotation of the nut loosening/tightening member around a first axis is obstructed by the locking member. When the operating member is in the operating position, the first matching portion is disengaged from the second matching portion, and rotation of the nut loosening/tightening member around the first axis tightens or loosens the nut.