| 摘要 |
<p>A tool-holder (9) has the upper end (10) screwable into a pre-existing threaded cavity (8) of the chuck (1) of a machine-punch (2), two opposite longitudinal slots (15) made in its lateral walls and an intermediate chamber (9A) in which an extractor cylinder (16) slides and is transversally crossed by a pin (17) that has each end sliding along a longitudinal slot (15) and serrated in a sleeve (18) sliding along the tool-holder (9), purpose of this sleeve (18) is to stop against a fixed or adjustable part of the machine-punch (4) at the end of the upstroke of the chuck, so that the spindle (13) is extracted from the bushing (12). <IMAGE></p> |
