Motor Drive Cover Lock With Visual Locked-State Indication
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Solution Overview
Problem
Conventional motor drive devices lack a visual indication of the locked state, making it difficult for users to determine whether the cover is locked or unlocked, which can lead to accidental opening and contact with the terminal block.
Innovation Solution
A motor drive device with a rotatable lock unit that includes a state indicator, allowing easy visual determination of the locked or unlocked state through a rotation angle-dependent mechanism with 'LOCK' and 'OPEN' indications on the cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is provided to restrict cover opening, then safety against accidental contact is improved, but visual indication of locked state deteriorates
Solution Approach 1:
The patent applies color changes by providing a state indicator that displays different visual appearances according to the rotation angle of the lock unit. The indicator shows different colors or patterns to indicate locked versus unlocked states, making it easy for users to visually determine the cover's state without adding complex mechanical indicators.
Solution Approach 2:
The patent uses an intermediary element (the state indicator) that mediates between the lock unit's rotational position and the user's visual perception. The indicator translates the mechanical state into visual information, resolving the contradiction between having a simple locking mechanism and providing clear visual feedback.
2Device complexity
If no state indicator is provided, then device complexity is reduced, but ease of operation deteriorates
Solution Approach 1:
The state indicator utilizes color or pattern changes based on the lock unit's rotation angle, providing clear visual feedback without adding mechanical complexity. This allows users to easily determine the locked state while keeping the lock unit structure simple.
Solution Approach 2:
The lock unit itself provides the visual indication function through its rotation angle-dependent state indicator, eliminating the need for separate complex indication mechanisms. The system serves its own information display needs through the inherent rotational position of the lock unit.
Data Source
AI summary
A motor drive device includes a case including a first surface and a housing portion that opens to the first surface side, a terminal block including a terminal to which an electric wire extending to an outside of the case is connectable and being housed in the housing portion, an openable and closable cover covering the opening, and a lock unit restricting opening and closing of the cover and bringing the cover into a locked state in a state where the cover is closed. The lock unit is provided on the cover to be rotatable about an axis perpendicular to the first surface in a state where the cover is closed. An unlocked state in which the cover is openable and the locked state are switched according to rotation angle of the lock unit. The lock unit includes a state indicator indicating that the cover is in the locked state.