| 摘要 |
A tractor chain is fitted with removable contact studs (3), e.g. of rubber, to suit the profile of the extrusion and to grip it. The studs (3) are held in holders (4) by a lock (5). An unlocking device (6) with an inclined surface (8) can be placed in the path, e.g. by moving it in the direction (Q) with an actuating cylinder, to undo the lock and release the studs as they pass Independent claims are also included for a corresponding device with the opposite action for placing new studs into the holders and for an automated combination of such removal and placement devices to change the studs on a tractor chain.
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