Patent ID: 6994503

Claim:
A quick nut for positive friction locking of a disc-like tool ( 2 ) to an external thread ( 3 ) of an axially extending working spindle ( 4 ) driven about an axis of rotation (A), said nut having an axially extending inner-threaded part ( 5 ) encircling said axis of rotation (A) for engagement with said external thread ( 3 ), a manually displaceable tensioning means ( 6 , 6 ′, 6 ″) encircling said axis of rotation (A) and movable axially relative to said inner threaded part ( 5 ) between a clamping position and a release position relative to said tool ( 2 ), and a spring structure encircling said inner threaded part ( 5 ) comprising at least one leaf spring ( 7 ) extending generally parallel to the axis of rotation (A) and being bowed in an axial direction in said release position, said at least one leaf spring being deflectable in the clamping position by said tensioning means into flat leaf spring in an axial direction and having first and second axially spaced ends, said first end being mounted in a stop ( 8 ) and said second end being mounted in said inner threaded part ( 5 ).