| 摘要 |
<p>553,360. Dust, confining in industrial processes. CHICAGO PNEUMATIC TOOL CO. Aug. 18, 1942, No. 11591. Convention date Dec. 9, 1941. [Class 8 (ii)] [Also in Group XXII] A drilling tool particularly for drilling aircraft structures is provided with a dustremoving attachment mounted on the tool body and comprising an axially movable guide surrounding the drill and connected with a dust extractor. A housing 20 supports a flanged cylinder 44, Fig. 4; which carries a sleeve member 42 slidable over the cylinder 44. The sleeve is urged forward by a spring 48, the movement being limited by the end of a stop member 53 pivoted to a hand-lever 55 which is itself pivoted at 56a to the cylinder 44. The sleeve 42 is connected by a line 61, 36 to a dust bag 37, suction being exerted at the working point by means of an air stream 39 directed into the bag. Specification 545,864 is referred to.</p> |
