Hammer mill for e.g. manually operated drill hammer, has crank gear driveably-connected with piston by connecting rod, where piston is rotatably supported at connecting rod around longitudinal center axis of piston

摘要

The mill (3) has a piston (4) stroke-adjustably arranged in a cylinder (5), and a crank gear (6) driveably-connected with the piston by a connecting rod (7), where the piston is rotatably supported at the connecting rod around a longitudinal center axis (18) of the piston. The piston is coupled with the connecting rod over a ball head bearing (20). A ball head of the ball head bearing is engaged and rotatably supported in a ball retainer. The ball retainer has a set of periphery segments arranged in a circumferential direction.