초록 ▼

There is provided by this invention a chip extraction apparatus for extracting chip swarf from a workpiece for collection in an external vacuum source. The chip extraction apparatus is comprised of a nosepiece assembly which houses a spring/atmospheric pressure actuated piston for providing telescop

There is provided by this invention a chip extraction apparatus for extracting chip swarf from a workpiece for collection in an external vacuum source. The chip extraction apparatus is comprised of a nosepiece assembly which houses a spring/atmospheric pressure actuated piston for providing telescopic capabilities to a drill bushing. The drill bushing contains an air inlet port for allowing air to be drawn into the interior fo the drill bushing where it will mix with chip swarf. The air application assists chip flow and contributes to efficient vacuum withdrawal of chip swarf from the drill flutes into the vaccum chamber of the nosepiece assembly. The chip swarf is eventually expelled through a vacuum port in the nosepiece assembly to the external vacuum source. Alternative drill bushing configurations are disclosed to provide consistent chip extraction rates for different material requirements and cutting tool types. Additionally, a means for introducing coolant/lubricant or pressurized air to, and removing coolant/lubricant or pressurized air from, the surface of the workpiece is disclosed. The chip extraction apparatus is disclosed in the context of both a portable drill used in conjunction will drill plates and a handheld drill in which the nosepiece assembly is eliminated, but the chip extraction capability is retained.

대표청구항 ▼

In combination with drilling equipment, a chip extraction apparatus attached thereto, comprising: a) a nosepiece assembly comprising a vacuum chamber for temporarily collecting chip swarf and a vacuum port interconnecting said vacuum chamber with an external vacuum source for passing the chip swarf

In combination with drilling equipment, a chip extraction apparatus attached thereto, comprising: a) a nosepiece assembly comprising a vacuum chamber for temporarily collecting chip swarf and a vacuum port interconnecting said vacuum chamber with an external vacuum source for passing the chip swarf from said vacuum chamber to said external vacuum source; b) a piston apparatus, slidably disposed in said nosepiece assembly, having a first side bounding said vacuum chamber; c) a guide bushing, attached to said piston apparatus, having at least one air inlet port and an output port for discharging air and chip swarf to said vacuum chamber; and d) a means for retractably extending said guide bushing within said nosepiece assembly.