| 摘要 |
<p>A suction cup dust extractor for a drill comprising: a housing (10); a drill collar (12) attached to the housing (10), having a drill passage (18) formed through it; a recess (38) formed by the walls (50, 52) of the housing (10) having an opening and which, in use, locates against a work piece to create a chamber; an aperture (24) located on the housing (10) through which air can pass; at least one first air passage (32) formed within the housing (10) which enables air to pass from the drill passage (18) to the aperture (24); and
at least one second air passage (36) formed within the housing (10) which enables air to pass from the recess (38) to the aperture (24); wherein the collar comprises:
an inner wall (500) which at least partially surrounds the drill passage (18); an outer wall (502) which at least partially surrounds the inner wall (500); the inner wall (500) and outer wall (502) forming a wall passage (504) in between them which connects to the at least one first air passage (32) to allow air to pass from the wall passage to the at least one first air passage (32); the depth of at least part of the inner wall (500) being less than that of the outer wall (502) to allow air to flow around the base (506; 900,902) of the inner wall from the drill passage (18) to the wall passage (504); characterised in that there is provided a cover (600) which attaches to the outer wall to enclose the lower side of the wall passage (504).</p> |
