Pantograph Down Stop Mechanism for Trolley Power Transfer
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Solution Overview
Problem
Pantograph assemblies in machines like off-highway trucks experience stress and instability when traveling over uneven surfaces due to jostling, which can lead to disengagement from overhead conductors and premature component failure.
Innovation Solution
A pantograph assembly with an articulated linkage system, stop member, and latch assembly that limits the downward movement of the collector rail assembly and locks it in place, preventing disengagement from the conductor and reducing stress on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pantograph assembly is lowered to make connection with overhead conductors, then electrical power transfer is enabled, but the components may be jostled by uneven work surfaces creating stresses and potential disengagement
Solution Approach 1:
The patent applies preliminary anti-action by providing a stop member that preemptively prevents excessive downward movement of the pantograph assembly before jostling forces can cause disengagement or component failure. The stop member is positioned to limit the downward travel of the articulated linkage, creating a mechanical barrier against harmful movements that could occur when the vehicle encounters uneven terrain during operation.
2Ease of operation
If the pantograph assembly is allowed full downward movement, then ease of connection is improved, but component wear and premature failure increase
Solution Approach 1:
The patent implements preliminary action by pre-positioning the stop member to define a predetermined lower limit position for the pantograph assembly before operational wear occurs. This stop member is installed in advance during assembly, establishing mechanical boundaries that prevent excessive movement and reduce cumulative stress on components during normal operation, thereby extending service life while maintaining operational ease.
3Reliability
If a locking mechanism is added to prevent disengagement, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies the taking out principle by extracting and isolating the limiting function into a separate, dedicated stop member that is distinct from the main pantograph linkage and actuation mechanisms. This stop member is a simple, standalone component that performs solely the function of limiting downward movement, rather than integrating the limiting function into the complex existing linkage system, thereby maintaining simplicity while improving reliability.
Data Source
AI summary
A pantograph assembly configured to transfer electrical power from an overhead conductor to a machine is disclosed. The pantograph assembly may include a pantograph base detachably mounted to the machine, an articulated linkage assembly having a linkage assembly lower end operatively connected to the pantograph base and a linkage assembly upper end pivotally connected to the linkage assembly lower end, a collector rail assembly operatively connected to the linkage assembly upper end, and a stop member. The stop member may be connected to the pantograph base and engaging the articulated linkage assembly, or connected to the articulated linkage assembly and engaging the pantograph base, to prevent the articulated linkage assembly from being lowered toward the pantograph base below a predetermined down position or lower limit position. A latch assembly may be mounted on the pantograph base and operable to move between a latch locked position and a latch unlocked position.