GB164228A - Improvements in or relating to devices for gripping or holding the work in drilling - Google Patents

Abstract

164,228. Wildy, D. W., and Wildy, D. W. May 21, 1920. Drilling.-In a jig for cross-drilling rods, pins, spindles, bars, tubes, spheres, circular articles, &c. of the kind in which the work is secured in transverse slots in a hollow body having a drill passage in its end by a screw-adjusted member movable longitudinally of the axis of the drill passage, the movable member is adjusted by a separate screwed cap or collar engaging a screw-thread in the hollow body. The work z is passed through a hollow body a and is clamped centrally against the flat upper edge of the slot by a V-recessed shouldered plug b, which is keyed at a<1> to the body and is adjusted by an internally-flanged screw cap d. Interchangeable flanged drill bushes f are screwed in the end of the body and may project either as far as or beyond the flat edge of the slot. The plug has a tapered stem c by which it may be secured in the tail spindle of a lathe or in a base g so as to rest on a bench in drilling machine. A hooked rod h, Fig. 6, furnished with a scale co-operating with a line on the body acts as a longitudinal stop for the end of the work. It is secured by a nut h<2> in a groove h<1> in the body and may also be angularly adjustable to suit the diameter of the work so as to engage it axially. In cases where the hole to be drilled is at a considerable distance from the end of the work, a measuring rule may be used in conjunction with the line on the body. The gripping surface of the plug may be curved or straight and the edge of the slot may be curved or V-shaped. In drilling spherical work the underside of the drill passage in the bush may be countersunk to facilitate clamping. For drilling closely adjacent holes a bush provided with several passages may be used. The apparatus may also be used for drilling triangular or square work.