| 摘要 |
923,618. Machine-tool details. DEREFA, ETABLISSEMENT POUR LE DEVELOPPEMENT, RECHERCHES ET FABRICATIONS INDUSTRIELLES. May 24, 1961 [May 27, 1960], No. 18752/61. Class 83 (3). [Also in Group XXIV] In a machine tool, air is blown between a slideway and a collapsible covering element 11a of plastics, leather or metal sheeting to prevent the ingress of dust. In a milling and boring machine, the spindle head 3 is displaceable vertically on a horizontally-movable column 1. Air is drawn from an external pipe 35 and blown through ducts 33, 27, the outlets beneath the telescopic element 11a being controlled by valves 29. Similar air supply means are provided for the covering means 11b, 44a. |
