Patent ID: 7228941

Claim:
A metering device for lubricant having a lubricant reservoir ( 1 ), a piston ( 3 ), which is arranged on a threaded spindle ( 2 ), within the lubricant reservoir ( 1 ) and a drive head ( 4 ), which has a drive shaft ( 7 ) connected to the threaded spindle ( 2 ) and an electromechanical drive ( 5 ) for actuating the drive shaft ( 7 ), wherein the drive shaft ( 7 ) contains a lubricant passage duct ( 8 ) which opens into a lubricant storage space of the lubricant reservoir ( 1 ), wherein a ram ( 9 ) is inserted into the lubricant passage duct ( 8 ) of the drive shaft ( 7 ), said ram having an axial bore ( 10 ) with a nonreturn valve ( 11 ) on the inlet side, and a ram head ( 13 ) which is arranged in a rotationally fixed manner and is loaded by a compression spring ( 12 ), and wherein the ram head ( 13 ) bears under the effect of the compression spring ( 12 ) against a control surface ( 14 ) of the drive shaft ( 7 ), the control surface ( 14 ) and an associated contact surface ( 15 ) of the ram head ( 13 ) being designed as slotted-guide surfaces which, when the control surface ( 14 ) rotates, bring about stroke movements of the ram ( 9 ), said movements conveying the lubricant through the bore ( 10 ) in the ram ( 9 ) to a lubricant outlet at the end of the ram.