Patent ID: 7048107

Claim:
A shaft locking device for a spindle ( 1 , 1 a , 1 b ) of a motor-driven, hand-guided work tool, said shaft locking device comprising: a spindle ( 1 , 1 a , 1 b ); a driven member ( 4 , 4 a , 4 b ) fixedly connected to said spindle ( 1 , 1 a , 1 b ); a freewheel ( 28 ) having locking members ( 22 ); a ring ( 23 ), fixedly connected to a housing, wherein said locking members ( 22 ) engage said ring ( 23 ) in both rotating directions of said spindle ( 1 , 1 a , 1 b ); a drive member ( 3 , 3 a , 3 b ) coaxially arranged to said spindle ( 1 , 1 a , 1 b ) and provided with unlocking members ( 10 , 10 a , 10 b ), wherein said unlocking members ( 10 , 10 a , 10 b ) co-operate with said locking members ( 22 ) in order to release said locking members ( 22 ) when said drive member ( 3 , 3 a , 3 b ) is driven such that said driven member ( 4 , 4 a , 4 b ) is released from said ring ( 23 ) and is rotatable; said driven member ( 4 , 4 a , 4 b ) and said drive member ( 3 , 3 a , 3 b ) having torque-transmitting catch surfaces ( 18 , 18 a , 18 b , 19 , 19 a , 19 b ) for a motor-driven drive action of said spindle ( 1 , 1 a , 1 b ), whereby said catch surfaces ( 18 , 18 a , 18 b , 19 , 19 a , 19 b ) have a larger distance from one another in a neutral position of said drive member ( 3 , 3 a , 3 b ) than a distance provided between said unlocking members ( 10 , 10 a , 10 b ) and respectively associated ones of said locking members ( 22 ); said drive member ( 3 , 3 a , 3 b ) having cams ( 11 , 11 a , 11 b ) that are spatially separated from said unlocking member ( 10 , 10 a , 10 b ), wherein said cams ( 11 , 11 a , 11 b ) penetrate into said driven member ( 4 , 4 a , 4 b ), and wherein said drive member ( 3 , 3 a , 3 b ) is a toothed wheel ( 7 , 7 a , 7 b ) supported on said spindle ( 1 ); said driven member ( 4 , 4 a , 4 b ) having catch openings ( 30 ); wherein said torque-transmitting catch surfaces ( 18 , 18 a , 19 , 19 a , 19 b ) are formed by cam surfaces ( 18 , 18 a , 18 b ) of said cams ( 11 , 11 a , 11 b ) and by drive surfaces ( 19 , 19 a , 19 b ) of said catch openings ( 30 ) facing said cam surfaces ( 18 , 18 a , 18 b ) in a respective rotational direction of said spindle ( 1 , 1 a , 1 b ).