Sawdust collection system for a circular saw

A sawdust collection system for a circular saw, comprising:

• a sawdust duct longitudinally adapted to be secured in a saw blade housing and having an enlarged portion formed on a front end of the sawdust duct, a slot defined in a top portion of the enlarged portion, the slot adapted to separately receive a saw blade of the circular saw;
• a sawdust chute partially longitudinally received in a lower portion of the enlarged portion of the sawdust duct, a pin laterally extending the sawdust duct and the sawdust chute to pivotally mounted the sawdust chute to the sawdust duct such that the sawdust chute can be swung relative to the sawdust duct, the sawdust chute including:
• a first stopper laterally outwardly extending from a bottom of the sawdust chute;
• a torsion spring sleeved on the pin, the torsion spring having a first end abutting against an inner periphery of the sawdust duct and a second end downward abutting against the first stopper to prevent the sawdust chute from a vibration during operating;
• and
• a second stopper laterally outwardly extending from a top of the sawdust chute, the second stopper adapted to selectively abut a distal edge of the enlarged portion of the sawdust duct to limit the moving range of the sawdust duct and prevent the sawdust chute from being contacted with the saw blade when the saw blade is downward moved near a base of the circular saw;
• and
• a support adapted to be secured on a body of the circular saw for supporting a bottom of the sawdust chute to adjust the angle between the sawdust duct and the sawdust chute before the saw blade housing and the enlarged portion of the sawdust duct contacting with the second stopper.