Patent ID: 7128300

Claim:
A stand ( 3 ) for a surgical microscope comprising: a stand column ( 1 ); a pivot arm ( 5 ); a rotary bearing ( 4 ) for mounting the pivot arm ( 5 ) on the stand column ( 1 ); an electromagnetic brake ( 6 ) for blocking the pivoting motion of the pivot arm ( 5 ) in the rotary bearing ( 4 ); and a mechanical brake ( 7 ) having adjustable braking force for braking the pivot arm ( 5 ) in the rotary bearing ( 4 ), wherein the mechanical brake ( 7 ) includes a resiliently preloaded pin ( 8 ) and a brake pad ( 9 ) connected to the pin ( 8 ) and wherein the mechanical brake further includes a hollow stem ( 10 ), a cup spring packet arranged in the hollow stem, and a set screw ( 11 ) threadably received by the hollow stem ( 10 ), the pin ( 8 ) is mounted in the hollow stem ( 10 ), and the preload on pin ( 8 ) is adjustable by way of the set screw ( 11 ), a hollow stem ( 10 ) and a set screw ( 11 ) threadably received by the hollow stem ( 10 ), wherein the pin ( 8 ) is mounted in the hollow stem ( 10 ), and the preload on the pin ( 8 ) is adjustable by way of the set screw ( 11 ), and wherein the mechanical brake further includes a cup spring packet ( 12 ) arranged in the hollow stem ( 10 ).