| 主权项 |
1. A buffer device with a self-adjustable stop, the device comprising a buffer head in the form of a shank and a socket into which said buffer head in the form of a shank can be driven axially, the device further comprising an annular ring inserted axially in an axial bore of said socket and actuatable in turning to block the axial position of said buffer head in said socket, said ring comprising a bottom edge defining a thrust ramp designed, when said ring is caused to turn, for producing a cam effect with said axial bore in a counterbore in the end of said socket and enabling said buffer head to be raised, wherein
said shank of said buffer head presents along its entire length at least one flat, and adjacent to said at least one flat, at least one zone of touching ribs or grooves forming serrations; said ring has an inside surface having at least one smooth longitudinal strip that extends axially, and at least one ribbed longitudinal strip that extends adjacent to the at least one said smooth strip; said shank of said buffer head is prevented from turning under said counterbore in said socket; the outer annular surface of said ring is provided with a cam path defining a cam profile that co-operates with at least one cam follower finger provided on the top edge of said bore; and said ring and said shank of said buffer head are designed to interact together so that said ring has a first angular position in said socket in which said buffer head can be driven into said ring serration by serration, and a second angular position in which said buffer head is blocked in axial position in said ribs of said ring. |
