Rail Coupler Head Locking for Crash-Ready Knuckle Alignment
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Solution Overview
Problem
Existing coupler systems, such as Janney couplers, risk unintentional unlocking during unintentional actuation, leading to potential damage due to non-aligned forces during crashes, and fail to maintain proper alignment for efficient energy absorption.
Innovation Solution
A coupler assembly with a second lock that prevents rotation of the knuckle to the coupled position under normal conditions but unlocks when a predetermined force is exceeded, featuring a locking element that breaks or resiliently moves to allow coupling during crashes, ensuring proper alignment and energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a torsion spring is used to automatically pivot and maintain the fully open position of the knuckle when the uncoupling mechanism is actuated, then the knuckle is maintained in the fully open position, but the lock cannot fall back into its locking position because it rests on the ledge of the knuckle which was pushed open by means of the torsion spring
Solution Approach 1:
The patent removes the torsion spring from the coupler assembly, eliminating the harmful force that prevents the lock from returning to its locking position. The uncoupling mechanism is simplified to only include the hand-operated lever that lifts the lock, without any additional springs or automatic positioning mechanisms that would interfere with lock return.
Solution Approach 2:
Instead of using a torsion spring to automatically maintain the knuckle in the open position, the patent relies on the natural gravity and mechanical design of the lock to allow the knuckle to remain open during coupling operations, while the lock can freely return to its locking position when the uncoupling mechanism is not actuated. The system inverts the approach by not using an active force to maintain the open position, thereby eliminating the interference with lock return.
2Ease of operation
If the knuckle is kept in the fully open position during uncoupling, then coupling readiness is improved, but unintentional opening of the coupler cannot be prevented leading to potential damage during crashes
Solution Approach 1:
The patent incorporates a stop member that preliminarily prevents the knuckle from rotating beyond a certain angle, thereby preventing unintentional opening during crash conditions. This stop member acts as a preliminary protective measure that limits the rotational movement of the knuckle to safe boundaries, preventing harmful effects while still allowing proper coupling operations.
Solution Approach 2:
The patent modifies the operational parameters of the knuckle rotation by introducing a stop member that limits the maximum rotation angle. This parameter change ensures that the knuckle can rotate sufficiently to maintain coupling readiness but cannot rotate beyond a safe limit that would cause unintentional opening during crashes or other extreme conditions.
3Reliability
If a locking mechanism is added to prevent unintentional opening, then safety during crash is improved, but the device complexity increases
Solution Approach 1:
The patent merges the locking function with the existing uncoupling mechanism by using a lock that is lifted by the hand-operated lever during intentional uncoupling. The same lock that enables intentional uncoupling also prevents unintentional opening during crash conditions, eliminating the need for separate locking and unlocking mechanisms and thereby reducing overall device complexity.
Solution Approach 2:
The lock in the patent serves multiple functions: it enables intentional uncoupling when lifted by the hand-operated lever, and it prevents unintentional opening during crash conditions. This multi-functionality reduces the need for additional separate mechanisms, thereby maintaining simplicity while improving safety and reliability.
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A coupler head (1) for a (Janney) coupler assembly of a multi-car rail vehicle comprises a coupler head body (10), a knuckle pin (12) and a knuckle (11) which is rotatable about the knuckle pin relative to the coupler head body between a coupled position and an uncoupled position. A first lock is configured to prevent rotation of the knuckle (11) when the knuckle (11) is in the coupled position. A second lock (20) is configured to prevent rotation of the knuckle (11) when the knuckle (11) is in the uncoupled position. The second lock (20) is further configured to unlock when a predetermined force, which acts on the knuckle (11) so as to rotate the knuckle (11) toward the coupled position, is exceeded, so that the second lock (20) no longer hinders rotation of the knuckle (11) toward the coupled position.