Patent ID: 6991407

Claim:
A lift cylinder assembly for a hydraulic support frame for underground mining comprising a lift cylinder, arranged essentially upright relative to the base shoes of the support frame, for lifting the base shoes during advancing, the lift cylinder being supported on one side by a return rod extending between the support frame and a face conveyor and on the other side by a drawbar which is connected to the base shoes, whereby the lift cylinder is attached in a limited pivoting manner to the drawbar with an end supporting head, wherein the supporting head is attached to the drawbar by use of a plug-type locking system comprising two plug-type locking elements, which include first locking notches on the drawbar essentially arranged laterally to the longitudinal axis of the lift cylinder, and, arranged essentially complementarily thereto second locking notches on the supporting head, whereby the plug-type locking elements engage in the first locking notches and/or the second locking notches with clearance.