US Patent 10493579 Dust collection system for a rotary power tool

A dust collection system for a rotary power tool, which has a flexible shaft connected to a handpiece, includes a vacuum blower configured to generate a negative pressure and a connecting hose defining a first void region fluidly connected to the blower and which has the negative pressure. The connecting hose is configured to extend along a first length of the flexible shaft. The dust collection system further comprises a nozzle portion defining a second void region fluidly connected to the first void region and which has the negative pressure, the nozzle portion being configured to extend along a second length of the handpiece.