| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems that as a size of a tightening nut for a disc grinder varies depending on manufacturers thereof, it is necessary to use a face spanner wrench dedicated for the tightening nut of each manufacturer, and since large strength is required to dismount the tightening nut when large torque is applied for grinding work and the tightening nut is firmly tightened, but an angle between a body and the face spanner wrench can only be set at intervals of 90 degrees, dismounting work is fairly difficult when there is no room but to select an angle in which strength is hard to be exerted. SOLUTION: Diameter of an insertion hole compatible with the face spanner wrench is set between 5.4 mm and 5.8 mm, pitch between the insertion holes is set between 19.2 mm and 19.4 mm, and the four pairs of the insertion holes, that is, eight insertion holes are concentrically arranged at intervals of 45 degrees. COPYRIGHT: (C)2011,JPO&INPIT |
