Tool for drilling and/or chiseling

A tool for at least one of drilling and chiseling comprises a housing (1), an axially extending guide tube (9) mounted in said housing and having a leading end and a trailing end spaced apart in the axial direction of said guide tube, a striking mechanism (6) mounted in said guide tube towards the trailing end thereof and includes a first piston (7) guided by said guide tube for reciprocating movement in the axial direction of said guide tube (9), a second piston (19) located within said guide tube and spaced from said first piston in the axial direction of said guide tube towards the leading end thereof for forming an air cushion within said guide tube between said first and second pistons, a driving anvil (17) located within said guide tube (9) on the opposite side of said second piston from said first piston (7) and arranged to be driven by said second piston as said first piston is reciprocated and said second piston is correspondingly reciprocated via said air cushion, said guide tube (9) having a series of first air passages (10) of the same cross section extending radially therethrough in a first plane (E1) arranged perpendicularly of the axial direction of said guide tube, a control body axially displaceable in the axial direction of said guide tube and arranged to selectively cover said first air passages (10), said control body interacting with said driving anvil (17) for displacement in the axial direction, said guide tube (9) having additional radially extending second air passages (11) therethrough located in at least one second plane (E2) spaced from first plane (E1) and located closer to said first piston (7) with said planes (E1, E2) arranged substantially parallel to one another.