Automatic lubricating device for the chisel of a hydraulic striking mechanism

An automatic lubricating arrangement for a chisel of a hydraulic striking mechanism which is charged from a source of operating pressure, the chisel being movable within a chisel guide, comprising:

• conveying means adapted for connection to the chisel guide for charging the chisel guide with lubricating grease and for connection to the source of operating pressure for the striking mechanism, said conveying means including a conveying chamber for receiving lubricating grease and means for performing a predetermined conveying stroke of adjustable magnitude each time the striking mechanism is charged with operating pressure for forcing lubricating grease out of said conveying chamber and into the chisel guide under pressure derived from the source of operating pressure;
• and
• means defining a lubricant reservoir for storing lubricating grease, said lubricant reservoir being connected to said conveying means and having a movable separating element and compression spring means biasing said separating element against the lubricating grease for supplying lubricating grease to the conveying chamber of said conveying means.