| 摘要 |
The dust-extraction equipment for a portable power drill comprises a housing (13) through which the bit (12) passes and which incorporates an outer wall (13c) and a washer (13b). A suction pipe (14) from the housing side is connected, preferably detachably, to the vacuum source, its inner cross-section widening towards the latter. The washer, at the side firthest from the work (A), accommodates a seal enclosing the bit. On or more air inlets (17) are formed in the outer wall, These can be tangental to the bit and at right angles to its axis, and extend in the direction of rotation, while the seal can be inclined towards the suction pipe. USE/ADVANTAGE - Full dust-extraction from around drill bit with no deposits in housing,.
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