Patent ID: 6615705
Filing Date: 2003-09-09
Classification: E21D,F15B

Abstract:
A hydraulic cylinder, for use in underground mining, with a locking ring arranged on an outer cylinder tube sealing it at its end with an opening as defined by the locking ring which accommodates an axially movable rod element accommodated in it, whereby the locking ring is provided in the opening as defined by the locking ring which accommodates the rod element, with a sealing arrangement resting on the outer side of the rod element, in which the sealing arrangement has a guide ring provided with grease grooves open to the outer side of the rod element, which is supplied with lubricant for the grease grooves via a lubricant line accessible on the outside on the hydraulic cylinder and which is arranged in an accepting groove formed in the locking ring between an axially inner and an axially outer collar, whereby the gap formed between the outer collar and the rod element is greater than the gap between the rod element (and the inner collar and that the guide ring is arranged axially inside adjacent to an axial further outward lying O-ring seal.