Pantograph Cam Locking for Secure Contact Strip Storage
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Solution Overview
Problem
Current collectors face challenges in securely holding the contact strip device in a storage position, preventing unintentional transfer from storage to sliding contact position due to operational loads, which can cause wear and inefficiency.
Innovation Solution
A locking device comprising a cam, a rotatably mounted shaft, and an anti-rotation device that secures the contact strip device in the storage position by rotating the shaft to lock the cam against the current collector, preventing movement back to the sliding contact position, and uses an anti-rotation mechanism to positively lock the shaft's rotational movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact strip device is held in storage position using only gravitational force, then the structure remains simple, but the device cannot reliably prevent unintentional transfer to sliding contact position under operational loads
Solution Approach 1:
The locking device uses a dynamic cam mechanism that can be actuated to transition between locked and unlocked states. The cam's rotational position dynamically controls the locking status, allowing reliable engagement during storage while enabling easy release when needed, resolving the contradiction between reliability and simplicity.
Solution Approach 2:
The cam acts as an intermediary element between the shaft and the contact strip device. By rotating the cam along the shaft, it mediates the locking action that prevents unintentional transfer, providing reliable locking without requiring a complex dedicated locking mechanism.
2Force
If the cam is designed to engage with the rocker unit for locking, then the locking force is sufficient to prevent movement, but the mechanism becomes more complex
Solution Approach 1:
The cam serves multiple functions: it provides locking force through engagement with the rocker unit, enables easy release through rotational actuation, and integrates with the existing shaft structure. This multi-functionality achieves sufficient locking force while minimizing additional mechanism complexity.
Solution Approach 2:
The locking function is merged with the existing shaft and rocker unit structure. The cam integrates with the rocker unit's geometry, combining the locking action with the existing mechanical components rather than adding a separate complex locking system.
3Ease of operation
If the shaft is designed to rotate freely for cam actuation, then the cam can be easily positioned, but the shaft cannot maintain its rotational position for secure locking
Solution Approach 1:
The shaft transitions from a static fixed position to a dynamic rotatable position. The anti-rotation device allows the shaft to rotate freely during positioning for easy cam actuation, then provides positive locking to maintain the rotational position securely during operation, resolving the contradiction between ease of operation and position stability.
Solution Approach 2:
The anti-rotation device applies preliminary anti-action by preventing unwanted rotational movement of the shaft after the cam has been positioned. This ensures that once the cam is set in its locking position, the shaft maintains its position reliably under operational loads.
Data Source
AI summary
A locking device for securing a contact strip device of a current collector in a storage position, the contact strip device being movable between a storage and sliding contact position relative to a conductor rail. The locking device has a cam, a rotatably mounted shaft and an anti-rotation device, the cam disposed on the shaft in a rotationally fixed manner and the cam movable from a release to locking position by rotation of the shaft, and the cam in the storage position of the contact strip device being able to be brought into contact at a first contact surface by being transferred to the locking position on the current collector in a manner that movement of the contact strip device is blocked relative to the conductor rail, and rotational movement of the shaft for securing the cam in the release or locking position being positively blocked of the anti-rotation device.