Patent ID: 6557653
Filing Date: 2003-05-06
Classification: B25D,E21B

Abstract:
A working tool for use with a percussion power tool having a percussion piston (5) and an anvil (6) that transmits shock pulses from the piston to the working tool, the working tool comprising a cushioning elongate stem (3); and a head (4) connected with the stem (3) for joint rotation therewith and for a limited axial displacement relative thereto, the tool stem (3) and the tool head (4) having mutually abutting each other end surfaces (10) which form at least a partially flat contact upon abutting each other, whereby shock pulses, which are produced by the percussion piston (5), are transmitted by the stem (3) to the head (4), and wherein the head (4) is dimensioned in accordance with dimensions of at least one of the percussion piston (5) and the anvil (6), whereby the shock pulses, which are produced by the percussion piston (5), are transmitted to the head (4) substantially without loss of pulse energy.