摘要 |
<p>The centering appliance is used in cutting circular holes in foil sheets which are being laid on walls where pins have to pass through for placing them correctly (as in 2604533). This involves a tubular piece (1) covered by a plate (2) cut out in a ring shape, together with a guideway cylinder (3) for the hole-cutter. This is held centrally by a floating arm on the chassis (5) at a set interval, so that the insertion slot (6) can be correctly placed to lay the foil centrally above the tubular piece. The tubular piece I.</p> |