PERCUSSION-ACTION MACHINE Russian patent published in 2005 - IPC

FIELD: machine engineering, namely manual percussion action machines such as electric hammers and perforators used in building, mining, machine engineering and other industry branches for making openings in building materials and rocks and also for breaking them.

SUBSTANCE: in percussion apparatus when guiding cylinder providing percussion action is arranged in limit axial position, opening is arranged outside zone 2R of working stroke of piston and outside zone H of air cushion, higher than working end of piston being in upper dead point. At idle stroke of percussion machine when guiding cylinder is in other limit axial position, striker is hold in front position due arrangement of opening in zone 2R of working stroke of piston directly near its working end when piston is in upper dead point. It provides short-time communication of air cushion with atmosphere.

EFFECT: enhanced reliability of idle stroke mode of percussion action machine.

2 dwg