Patent ID: 7475622
Filing Date: 2009-01-13
Classification: B27G,Y10T

Abstract:
1. A supporting device for mounting a protective cover to shield a cutting blade of a cutting machine which is driven to rotate about a rotating axis, said supporting device comprising: a mount unit which is adapted to be secured to the cutting machine, said mount unit including a major abutment wall which has a proximate tightening surface that has an axial hole extending therethrough along a tightening axis parallel to the rotating axis of the cutting blade; a tightening bolt having a shank which is configured to pass through said axial hole, and which has front and rear ends opposite to each other in the tightening axis, and an intermediate segment interposed between said front and rear ends; a supporting frame which has upper and lower ends opposite to each other, and a middle segment interposed between said upper and lower ends, said upper end being adapted to hold the protective cover, said middle segment having proximate and distal tightened major surfaces opposite to each other along the tightening axis, and a guiding slot which extends through said proximate and distal tightened major surfaces and which 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 said shank, and which has a thrust major wall to which the tightening axis is normal, said thrust major wall having a distal tightening surface which confronts and which is to be brought to press said distal tightened major surface so as to force said proximate tightened major surface to abut against said proximate tightening surface, and a cam follower surface which is opposite to said distal tightening surface along the tightening axis, and which has first and second pressed areas that are angularly displaced from each other about the tightening axis, and that are respectively proximate to and distal from said distal tightening surface along the tightening axis; a cam actuating member including a biasing member disposed on said shank adjacent to said rear end of said shank such that, as a result of displacement of said actuating body to the tightening position, said biasing member acquires an increment of a biasing force which biases said front end of said shank towards said supporting frame so as to counteract the axial frictional force to thereby keep said actuating body in the tightening position.