Patent ID: 8082787

Claim:
Apparatus for measuring forces which are produced by an unbalance of a rotary member, comprising a measuring shaft ( 2 ) which is supported in a rotary mounting ( 26 ) rotatably about its axis ( 23 ) and to which the rotary member ( 1 ) is fixed for the measurement operation, and a support means ( 3 ) having force measuring sensors ( 4 , 5 ) for supporting the measuring shaft ( 2 ) on a stationary frame ( 6 ), wherein the support means ( 3 ) has an intermediate frame ( 7 ) on which the measuring shaft ( 2 ) is supported in a mounting plane having a force measuring sensor ( 4 ), the intermediate frame ( 7 ) is supported on the stationary frame ( 6 ) by way of a further force measuring sensor ( 5 ) and by way of a first pair ( 11 , 12 ) of support levers and pivots ( 15 to 18 ), the rotary mounting ( 26 ) is fixedly connected to a stiff holding device ( 29 ) at an axial spacing with respect to the mounting plane ( 8 ) in which the force measuring sensors ( 5 , 6 ) are disposed, the holding device ( 29 ) is supported on the intermediate frame ( 8 ) by way of a second pair ( 13 , 14 ) of support levers and pivots ( 19 to 22 ), the holding device ( 29 ) has in a plan view a triangular form and comprises an angle support member ( 34 ) fixedly connected to a holding plate ( 33 ) which extends perpendicularly to the axis ( 23 ) of the measuring shaft ( 2 ), the support levers ( 11 to 14 ) are formed by stiff flat members arranged between the associated pivots ( 15 to 22 ), and the pivots ( 15 to 22 ) are in the form of linearly extending weak locations with a concave cross-section, having axes extending substantially perpendicularly to the direction in which the forces applied to the force measuring sensors ( 4 , 5 ) are operative, and in addition the measuring shaft ( 2 ) is supported on the intermediate frame ( 7 ) and the intermediate frame ( 7 ) on the stationary frame ( 6 ) in a respective virtual mounting location ( 24 , 25 ) formed by support levers ( 11 , 12 , 13 , 14 ), characterized in that a first segment ( 42 ) of each of the two pivots ( 20 , 21 ) which connect the second pair of support levers ( 13 , 14 ) to the holding device ( 29 ) is formed into the material of the holding device ( 29 ) and the remaining second segment ( 43 ) of the pivot is formed into the material of the respective support lever ( 13 , 14 ), the first segment ( 42 ) of the pivot ( 20 , 21 ) is formed into the material of the holding plate ( 33 ), the first segment ( 42 ) of the pivot ( 20 , 21 ) forms the side edge of the holding plate ( 33 ), wherein the surface of the first segment ( 42 ) of the pivot ( 21 , 22 ) is directed substantially to the mounting plane ( 8 ) in which the force measuring sensors ( 5 , 6 ) are disposed, and the surfaces of the concave pivots ( 15 to 22 ) are disposed on the outer side surfaces of the support means ( 3 ).