| 摘要 |
A rail vehicle has a pivotal latch pivotally mounted to its frame so that gravity urges one end of the locking latch toward a rack extending along the railway on which the rail vehicle is positioned for movement. A smooth slideway extends parallel to and adjacent the rack and a rocker arm pivotally mounted on the locking latch has a lower end pivotally urged by gravity into contact with the slideway so that forward movement of the rail vehicle pivots the rocking arm to cause the locking latch to be pivoted upwardly out of contact with the rack with any initiation of rearward movement causing reverse pivoting of the rocker arm to lower the locking latch into engagement with the rack to prevent further reverse movement of the vehicle. Maintaining the locking latch out of contact with the rack during forward movement reduces wear and avoids the generation of clacking noise during forward movement of the vehicle.
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