Battery Cutout Switch Handle Locking Mechanism
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Solution Overview
Problem
Existing battery cutout switches lack a mechanism to securely lock the handle in both closed and open positions, applicable to both removable and non-removable handles, which can lead to accidental changes in the electrical system's power state during maintenance or operation.
Innovation Solution
A battery cutout switch design featuring a rotatable handle with control members and a cam system that allows locking in both positions, using a separate locking element and stop member to ensure the handle remains stable, and an optional cap for protection against contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is added to secure the handle in both open and closed positions, then the reliability of the switch is improved, but the device complexity increases
Solution Approach 1:
The locking element is nested within the handle structure, with a locking protrusion on the handle that engages with a locking recess in the housing. This integrated nesting approach provides reliable locking in both positions without adding external complex mechanisms.
Solution Approach 2:
A cam mechanism serves as an intermediary between the handle rotation and the locking element engagement. The cam profile guides the locking protrusion into the locking recess at specific handle positions, enabling reliable locking through a simple geometric intermediary rather than complex control systems.
2Reliability
If the handle is made non-removable with integrated locking, then the reliability of maintaining switch position is improved, but the ease of operation for maintenance decreases
Solution Approach 1:
The locking mechanism is designed to be dynamically engageable and disengageable during normal handle rotation. The cam mechanism automatically releases the locking element when the handle is rotated to specific positions, allowing maintenance personnel to access and remove the handle when needed while maintaining stability during operation.
Solution Approach 2:
The locking protrusion and recess are pre-positioned on the handle and housing respectively, so that locking occurs automatically when the handle is rotated to the correct position. This preliminary positioning eliminates the need for separate locking actions during maintenance while ensuring stability during normal use.
3Adaptability or versatility
If a separate locking element is provided that can be inserted through the handle, then the versatility of the locking system is improved, but the device complexity increases
Solution Approach 1:
The locking element serves multiple functions: it can be engaged by rotating the handle to lock in either open or closed position, and it can also be independently accessed through the handle for external locking if needed. This multi-functionality provides versatility without requiring separate locking mechanisms for different positions.
Solution Approach 2:
The locking element is merged with the handle structure through the locking protrusion, combining the handle and locking functions into a single integrated component rather than separate parts. This reduces overall component count while maintaining versatile locking capability.
Data Source
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AI summary
A switch, in particular a battery cutout switch for vehicles and the like, comprising: - a housing (12) carrying at least one pair of fixed electrical contacts (22) and having a tubular neck (42) extending along a longitudinal direction (A), - a contact-holder body (28) carrying at least one movable electrical contact (32) and movable between an open contacts position and a closed contacts position, and - a handle (44) rotatable with respect to the housing (12) about said longitudinal axis (A), between an open position and a closed position, wherein: - said handgrip (48) of the handle (44) has two transverse through-holes (100) opposite to each other; - the tubular neck (42) has an edge (106, 108) facing said handgrip (48) having a first and a second locking seat (110, 112), angularly offset from each other and arranged so that in the open position of the handle (44), one of said through-holes (100) is aligned with the first locking seat (110) and in the closed position of the handle (44) said hole (100) is aligned with the second locking seat (112); and - a separate locking element (114), insertable through one of said through-holes (100) and through the locking seat (110, 112) facing thereto, to lock the handle (44) in the closed position or in the open position.