Apparatus for tightening threaded fasteners

摘要

According to a first aspect of the invention we provide an apparatus for reaction - free and reaction - assisted tightening and loosening of an industrial fastener including: a motor ( 102 ) to generate a turning force to turn the fastener; a turning force multiplication mechanism ( 210 ) for a lower speed/higher torque mode including a plurality of turning force multiplication transmitters ( 211, 212, 213 ); a turning force impaction mechanism ( 250 ) for a higher speed/lower torque mode including a plurality of turning force impaction transmitters ( 251, 252 ); a housing ( 220 ) operatively connected with at least one multiplication transmitter; a reaction mechanism ( 401 ) to transfer a reaction force generated on the housing during the lower speed/higher torque mode to a stationary object; wherein during the lower speed/higher torque mode at least two multiplication transmitters rotate relative to the other; and wherein during the higher speed/lower torque mode at least two multiplication transmitters are unitary to achieve a hammering motion from the impaction mechanism.