Chain boards of a metal filings conveyer

Chain boards of a metal filings conveyer comprising a plurality of chain boards arranged in parallel, each said chain board formed with a rectangular base plate, said base plate having two short sides respectively bent inward to form a side plate, said side plate provided with a central line perpendicular to a lengthwise axis of said base plate, said central line dividing said side plate into a first half portion and a second half portion, said second half portion retracted inward along said lengthwise axis of said base plate to form a step with said first half portion, said base plate having two broadsides respectively disposed along said lengthwise axis with a plurality of pivotal tubes arranged in stagger and at least one side pivotal tube abutting upon said second half portion of one of two said side plates, said metal filings conveyer further comprising a plurality of pivotal rods, said pivotal rods respectively inserted in said pivotal tubes at adjacent sides of every two said chain boards to connect said chain boards together to make up a said metal filings conveyer;

• and characterized by
• said pivotal tube, which abuts upon said second half portion, defined to be a first pivotal tube, said first pivotal tube having one end close to said second half portion cut short to form a notch for said chain board;
• and
• a plurality of filling collars respectively received in said notch of each said chain board, each said filling collar bored with a central insert hole, a central axis of said insert hole and a central axis of said pivotal tube positioned coaxially, said pivotal rods further respectively inserted in said central insert holes of said filling collars.