Stand for a surgical microscope

1. 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 ).

2. The stand ( 3 ) as defined in claim 1 , wherein the rotary bearing ( 4 ) includes a flange ( 13 ) having a recess ( 14 ) facing the pivot arm ( 5 ) for reception of the brake pad ( 9 ), and the hollow stem ( 10 ) is arranged in the flange ( 13 ).

3. The stand ( 3 ) as defined in claim 1 , wherein the brake pad ( 9 ) is manufactured from bronze.

4. The stand ( 3 ) as defined in claim 1 , wherein the brake pad ( 9 ) has a curved surface ( 15 ) for contacting the pivot arm ( 5 ).

5. The stand ( 3 ) as defined in claim 4 , wherein the curved surface ( 15 ) of the brake pad ( 9 ) is concave.