Switch Cabinet Secondary Door Lock Lever Accessibility
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Solution Overview
Problem
Existing locking devices for switch cabinets with secondary doors have a mechanism that is difficult to access manually when the lock door is open, as the lever for operating the secondary door lock is located inside the cabinet and not visible to the user.
Innovation Solution
A swiveling lever on the secondary door is pivotably mounted on an outer free profile side, allowing it to move between open and locking positions, making it accessible from the front and avoiding obstruction by the secondary door, with a scissor element mechanism and pinch protection covers for safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the lever for operating the secondary door lock is located on the inside of the cabinet on the door leaf, then the locking mechanism can be compactly integrated, but the lever becomes inaccessible and invisible to the user when the lock door is open
Solution Approach 1:
The lever is mounted on the outer free profile side of the U-profile, extending perpendicular to the door leaf plane. This spatial repositioning moves the lever from the internal door leaf area to the external accessible surface, allowing user interaction from the front of the switch cabinet while maintaining compact integration through the U-profile structure.
2Ease of operation
If the swivelling lever is mounted on the outer free profile side of the U-profile, then the lever becomes accessible from the front, but additional structural features (U-profile with outer free profile side) are required
Solution Approach 1:
The U-profile serves multiple functions: it provides the mounting structure for the lever, creates the outer free profile side for accessible operation, and integrates with the door leaf as a single piece. This multi-functionality reduces the need for separate components while achieving both accessibility and structural requirements.
Solution Approach 2:
The U-profile is integrally formed with the door leaf, combining what could be separate components into a unified structure. This merging reduces assembly complexity and ensures precise alignment while providing the necessary outer free profile side for lever mounting.
3Ease of operation
If the swivelling lever moves between open and locking positions perpendicular to the door leaf plane, then the lever is fully accessible from the front, but the movement path may expose fingers to pinching hazards
Solution Approach 1:
Pinch protection covers are provided that preemptively prevent finger access to the pinching zone during lever operation. The covers are positioned to block the space between the lever and U-profile before the lever moves, eliminating the pinching hazard while preserving full front accessibility for normal operation.
Data Source
AI summary
A locking device for a switch cabinet, with a lock door and a secondary door, wherein the secondary door, on a vertical outer edge opposite its hinge side, has a U-profile formed on a door leaf of the secondary door with a receptacle for a lock mechanism of the lock door, which receptacle is offset back relative to the door leaf and which is open towards the door leaf, wherein on an outer free profile side of the U-profile, a swivelling lever of a lock of the secondary door is pivotably mounted about an axis of rotation between an open position and a locking position. Furthermore, a corresponding switch cabinet is described.