Patent ID: 8591292

Claim:
A ceiling grinding machine ( 1 ) comprising: a drive unit ( 8 , 9 , 10 ), a grinding plate ( 12 , 12 ′; 31 ; 49 ), which can be set in rotation by means of the drive unit ( 8 , 9 , 10 ), a grinding-head housing ( 6 ) receiving the grinding plate ( 12 , 12 ′; 31 ; 49 ) and having an opening ( 13 ) giving the grinding plate ( 12 , 12 ′; 31 ; 49 ) access to a surface ( 14 ) to be ground, and a holding element ( 5 ) for holding the grinding machine ( 1 ), the ceiling grinding machine ( 1 ) further comprising means for generating a reduced pressure inside the grinding-head housing ( 6 ) so that the ceiling grinding machine ( 1 ) is held against the surface ( 14 ) to be ground, the means for generating the reduced pressure comprising lamellar elements ( 20 , 20 ′; 39 - 42 ; 68 - 75 ) that rotate (arrow R) around an axis (S) of the grinding plate ( 12 , 12 ′; 31 ; 49 ) during grinding operation of the ceiling grinding machine ( 1 ) and cause an air flow (arrows A, B, C, D) that induces a static reduced pressure inside the grinding head housing ( 6 ), wherein the reduced pressure generated by the lamellar elements alone genrates a force which acts in the direction of the surface to be ground and which corresponds to at least 60% of the weight of the entire ceiling grinding machine.