Abstract: This invention is a new structure of blackboard eraser with cordless vacuum functionality. The main components in the design include a chalk eraser, chalk dust collector and vacuum fan. A brusher mounted in the edge of inlet hole of chalk dust collector removes the chalk dust from the surface of eraser belt shape fabric and then the chalk dust is vacuumed into the collector chamber by vacuum fan. The roller shafts are inserted to the eraser bracket side holes and then go to the center of cylinder rollers. The eraser belt shape fabric covers to the external of the four rollers and eraser bracket. The eraser belt fabric will be conveyed back and forth by the friction with rollers and erase the chalk dust from the blackboard. One filter bag installed in the collect chamber filters the chalk power from the inlet air of the vacuum fan.

Abstract: This invention is a new structure of blackboard eraser with cordless vacuum functionality. The main components in the design include a chalk eraser, chalk dust collector and vacuum fan. A brusher mounted in the edge of inlet hole of chalk dust collector removes the chalk dust from the surface of eraser belt shape fabric and then the chalk dust is vacuumed into the collector chamber by vacuum fan. The roller shafts are inserted to the eraser bracket side holes and then go to the center of cylinder rollers. The eraser belt shape fabric covers to the external of the four rollers and eraser bracket. The eraser belt fabric will be conveyed back and forth by the friction with rollers and erase the chalk dust from the blackboard. One filter bag installed in the collect chamber filters the chalk power from the inlet air of the vacuum fan.

Abstract: This invention is a new design in the structure of a Dustless Eraser for Blackboards. The main component includes a rectangular hollow eraser case with, screw holes, roller shaft holes, and spring holders on the two sides. An interior brusher, with the same dimensions as the eraser case, is mounted in the base of the eraser case and comes into contact with the eraser fabric. Two rollers are secured to the eraser case via the roller shafts, which are secured to the roller shaft holes. A hat shaped bracket is screwed to the eraser case via the two sides bolts hole and two rollers are arranged on the front and back of the bracket. The eraser belt fabric is sleeved onto the outside of the two rollers and the bracket. The eraser belt fabric is supported by the top surface of the bracket. Two springs are hooked to the roller shaft in the oblong shaft holes and then hooked to the end of eraser case via the spring holders. A pad made of soft material is mounted around the edge of the eraser case.