| 摘要 |
A coupler having a coupler head and a shank which extends from the coupler head and terminates at a butt end adjacent which a pinhole is formed for receiving a pivot pin that is used to pivotally mount the coupler on a railroad car, mine car, etc. A semi-cylindrical recess is formed in the backside of the pinhole closest the butt end of the shank for receiving a matingly configured wearplate that is held captive in the recess between the pivot pin and adjacent butt end of the shank. The wearplate is composed of an ultra high molecular weight polymer.
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