| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a suction head of a low manufacturing cost for reducing a wear of a sealing element by precisely guiding a drill tool in the case of a drilling operation. SOLUTION: In the suction head for a suction apparatus having a ring-like support 1, a tubular guide body 2 releasably coupled to the support 1, a suction connector 51 connected to the support 1, and a ring-like sealing element 6 protruded from a movable end of the side opposed to a perforating direction of the support 1; a first end region 22 of the body 2 is projected from a first movable end of the support 1 in an axial direction. In this case, the element 6 is projected in the degree not exceeding a projecting range for projecting it from the first end of the support 1.</p> |
