High frequency pneumatically actuated drilling hammer

摘要: A drilling hammer in which a piston cylinder is propelled opposite directions by compressed air to impact repeatedly upon an anvil connected drill bit. On its return stroke, the impacts against spring device, storing energy therein returned device on downstroke, causing frequency of reciprocation increase considerably, correspondingly increasing power output hammer. Preferably, comprises stack Belleville springs or discs, are more efficient operation and result compact