Patent ID: 6860339
Filing Date: 2005-03-01
Classification: E02F

Abstract:
1. A bit striking apparatus in an excavator comprising: a back head having a central inlet through which air is introduced under a predetermined value of pressure; a check valve located under the inlet of the back head for preventing backflow of introduced air to the inlet of the back head; a sleeve tube for being hermetically coupled by an upper inner periphery with a lower end of the back head and slidably coupled by a lower inner periphery with a hammer bit which is fixed by a chuck; a piston located over the hammer bit within the sleeve tube which is moved up and down within the sleeve tube owing to distribution of air pressure by an air distributor to strike down the hammer bit ; and the air distributor located between the back head and the piston within the sleeve tube for adequately distributing air so that the piston can be vertically moved to strike the hammer bit.