Fifth Wheel Coupling Safety Latch Mechanism
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Solution Overview
Problem
The existing fifth wheel coupling systems for articulated vehicles lack a reliable safety mechanism to prevent accidental separation of tractor and trailer sections, which can lead to dangerous situations due to failed locking mechanisms or improper latching.
Innovation Solution
A fifth wheel coupling system with a safety latch mechanism that includes a keyhole slot, a coupling aperture, and a locking mechanism, where a movable safety latch blocks the keyhole slot to prevent kingpin dislodgment when coupled, and an operating mechanism to move the latch into an inactive position for uncoupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety latch is added to prevent accidental separation, then safety and reliability are improved, but device complexity increases
Solution Approach 1:
The safety latch is nested within the existing fifth wheel coupling structure, utilizing the keyhole slot and integrating with the locking mechanism components. The latch operates within the confined space of the coupling assembly, adding safety functionality without requiring a separate external mechanism.
Solution Approach 2:
The safety latch is positioned to automatically engage and block the keyhole slot before the kingpin can disengage. The latch mechanism is pre-configured to intercept the kingpin's movement path, preventing separation before it can occur rather than reacting after failure.
2Reliability
If the safety latch blocks the keyhole slot to prevent separation, then safety is improved, but ease of operation deteriorates due to difficulty in uncoupling
Solution Approach 1:
The safety latch transitions from a static blocking position to a dynamic movable position through the operating mechanism. The latch can be actively displaced along its axis to move between blocking the keyhole slot and allowing kingpin passage, enabling both safety during coupling and ease of uncoupling.
Solution Approach 2:
The safety latch operating mechanism serves as an intermediary device that mediates between the locked safety state and the uncoupled state. By operating this intermediate mechanism, the user can safely transition the latch from its blocking position to permit controlled separation.
3Reliability
If the safety latch is always engaged to prevent separation, then reliability is improved, but productivity deteriorates due to additional steps required for uncoupling
Solution Approach 1:
The safety latch operating mechanism is integrated into the existing coupling system's operational flow, allowing the same or similar controls used for locking to also manage the safety latch. This self-service approach minimizes additional operational steps by utilizing the system's existing control structure.
Data Source
AI summary
A safety latch is mounted in the keyhole of a fifth wheel coupling for joining the sections of an articulated vehicle. The safety latch is movable from an inactive position permitting the kingpin to move through the slot and into the aperture to an active position blocking the keyhole slot thereby preventing movement of the kingpin through the keyhole slot when the sections are coupled together.