Working table of machine tool having protective cover

A machine tool comprising:

• a base including an upper portion and including at least one end portion;
• a working table slidably supported on said upper portion of said base, having an upper surface, said working table being slidable to a position outward of the base beyond the at least one end portion of the base, and including a first end;
• a protective cover including a first end rotatably secured to said first end of said working table with a pivot shaft and rotatable about said pivot shaft, and including a second end opposite said first end of said cover;
• said second end of said protective cover being rotatable about said pivot shaft to a position located below said upper surface of said working table when said working table is moved to said outward position, and said protective cover being caused to rotate relative to said pivot shaft and to move upward of said upper portion of said base when said first end of said working table is moved to a position that is not outward of the base beyond the at least one end portion of the base;
• and
• a positioning means for positioning said cover relative to said working table, said positioning means including a rod pivotally coupled between said cover and said base for limiting a rotational movement of said cover relative to said base, said rod including two ends, said positioning means further including two couplers secured to said ends of said rod and pivotally secured to said cover and said base respectively for pivotally coupling said rod between said cover and said base.