Patent ID: 6062114
Filing Date: 2000-05-16
Classification: B25B

Abstract:
A power nutrunner, comprising:a housing (11);a rotation motor;a reduction gearing (12) including at least one planetary gearing, said at least one planetary gear including a ring gear (25);a torque limiting release clutch (13) arranged between the ring gear (25) of said at least one planetary gearing and said housing (11);said ring gear (25) being rotatably but axially immovably supported relative to said housing (11) and provided with a first axially acting cam (42);an annular axially movable thrust element (45) provided with a second cam (44);a lock device (47-49) which rotationally locks said thrust element (45) relative to said housing (11);a spring (53) arranged to exert an axial bias load on said thrust element (45); andat least two rolling elements (43) located between said thrust element (45) and said ring gear (25) so as to be engaged by said first and said second cams (42, 44) under said bias load;wherein:said ring gear (25) is substantially tubular in shape and has a cylindrical outer surface (40);said thrust element (45) has a larger diameter than said ring gear (25) and encircles said cylindrical outer surface (40) of said ring gear (25); andsaid ring gear (25) has an annular shoulder (41) which extends radially outwardly from said cylindrical surface (40) and which comprises said first cam (42).