| 摘要 |
A debris shield for a rotary tool or machine for collecting debris generated while cutting or drilling holes in a work surface has a debris collection housing having a top structure, side walls depending from said top cover structure to form a debris collection chamber, an open bottom with a surface contact rim, and a compression axis extending through the housing's top structure and bottom opening. In one aspect of the invention, the debris collection housing is a bellows housing with a vacuum port, and has a shank-holding and vent assembly in top structure of the bellows housing for receiving and rotatably holding the shank of a rotary surface working implement such as a drill bit, spade bit or hole saw. In another aspect of the invention the debris collection housing can be either a bellows type housing or rigid housing, and can have a vacuum port or not. In this aspect of the invention, the housing is provided with a chuck-arbor assembly having a chuck end and an arbor end rotatably mounted in the top structure of said debris collection housing so that it lies on a rotary axis that is substantially parallel to the compression axis of said debris collection housing. The chuck end of said chuck-arbor assembly is situated within said housing for receiving and holding the arbor end of a surface working implement, and the arbor end of said chuck-arbor assembly projects above the top structure of said housing such that the arbor end of said chuck-arbor assembly can be inserted into the chuck of a rotary tool such as a handle drill. In one embodiment, compression along the compression axis is provided by means of a bellows type housing; in another embodiment compression is provided by a chuck-arbor assembly having a spring loaded shaft which is slidably mounted in the top structure of the housing, such that the chuck end of the chuck-arbor assembly can be made to advance against the restoring force of the spring loaded shaft toward a work surface.
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