A supporting device for mounting a protective cover to shield a cutting blade of a cutting machine, said supporting device comprising:
- a mount member which is adapted to be secured to the cutting machine, said mount member including a major abutment wall which has a proximate tightening surface facing rearward;
- a tightening bolt having a shank which has a front end fastened to said major abutment wall, a rear end opposite to said front end along an axis, and guided and threaded segments that are interposed between said front and rear ends, and that are proximate to and distal from said front end, respectively;
- a supporting frame which has an upper end adapted to hold the protective cover, and a middle segment which extends downwardly from said upper end and which has proximate and distal tightened major surfaces opposite to each other along the axis, and a guiding slot that extends through said proximate and distal tightened major surfaces and that permits passage of said shank therethrough, said guiding slot permitting said middle segment to be movable between a position of use, where said shank is remote from said upper end, and a retreat position, where said shank is closer to said upper end;
- a movable tightening member which is sleeved on and which is in splined engagement with said guided segment, and which includes a tightening major wall that confronts said distal tightened major surface, and a biasing-force acquiring major wall that is opposite to said tightening major wall along the axis, and that is configured to acquire, as a result of yielding of said biasing-force acquiring major wall to a pushing force, an urging force to counteract the pushing force;
- and
- an actuating member including
- an actuating body which has a force-applying end wall that confronts said biasing-force acquiring major wall, and that is turnable about the axis, said actuating body having an internally threaded surface threadedly engaged with said threaded segment to generate a frictional force such that, by virtue of splined engagement of said movable tightening member with said guided segment, turning of said internally threaded surface relative to said threaded segment results in axial displacement of said force-applying end wall between a loosening position, where said force-applying end wall is not in pressing engagement with said biasing-force acquiring major wall, and a tightening position, where said biasing-force acquiring major wall is pressed forward by the pushing force, thereby acquiring the urging force, and
- a handgrip which extends radially from said actuating body to facilitate turning of said actuating body so as to vest said force-applying end wall with the pushing force to place said biasing-force acquiring major wall in the tightening position, where the urging force biases said force-applying end wall to counteract the frictional force, thereby guarding said handgrip against angular movement away from the tightening position.