公开(公告)号：US3552070A

公开(公告)日：1971-01-05

申请号：US3552070D

申请日：1968-12-16

申请人： OZTEC IND INC

发明人： REISS PETER F

IPC分类号： A47L11/16 ,  B24B7/18 ,  B24B23/00 ,  B24B25/00

CPC分类号： B24B7/186 ,  A47L11/16 ,  A47L11/4058 ,  A47L11/4069

摘要： IN A FLOOR GRINDER, A MOTOR DRIVES A HOLLOW VERTICAL SHAFT. A LOWER SHAFT TELESCOPES INTO THE HOLLOW SHAFT, IS SPRING LOADED DOWNWARD, AND HAS A GRINDING PLATE FIXED TO ITS LOWER PROJECTING END. THE HOLLOW SHAFT HAS AT LEAST ONE SPIRAL DRUM CAM CUTOUT FORMED IN IT AND THE LOWER SHAFT HAS A CAM FOLLOWER EXTENDING INTO THE DRUM CAM CUTOUT SO THAT EXCESSIVE TORQUE IMPOSED BY FRICTIONAL RESISTANCE ENCOUNTERED BY THE GRINDING PLATE CAUSES THE DRUM CAM CUTOUT TO RAISE THE CAM FOLLOWER AND THE LOWER SHAFT AND LIFT THE GRINDING PLATE THEREBY LIMITING TORQUE.