Patent ID: 8435096

Claim:
A dust proof machine tool, comprising: a tool body which includes a housing chamber to hold a spindle, the housing chamber including an air intake section and an air discharge section communicating with the air intake section, the tool body also including an air inlet formed on the air intake section and an air outlet communicating with the air discharge section, the spindle being coupled with an action member outside the air outlet and being coupled with a balance weight set, the balance weight set including a first balance weight portion and a second balance weight portion that overlap with each other; and a fan located on the balance weight set and located in the housing chamber to introduce external air through the air inlet to the air intake section, and direct the air to the air discharge section to be discharged towards the action member outside the air outlet, the fan including a first blade portion located on the first balance weight portion and a second blade portion located on the second balance weight portion.