GB135877A - Improvements relating to Jigs and the like. - Google Patents

Abstract

135,877. Winpenny, A. R. June 22, 1918. Boring and drilling.-In a jig for boring, drilling, spot-facing, and hollow-milling levers, flanges, couplings, tubes, rolls, bushes, &c., of the kind in which the work is held between two oppositelydisposed and laterally-fixed locating-bushes or other fittings mounted in the same carrying-frame, into and from which the work may be inserted and removed without removing the apparatus from the drilling or boring machine table to which it is fixed, the top bush fitting is fixed axially, and the bottom bush or fitting is axially adjustable. A base 1, Fig. 1, fixed to the machine table has integral therewith, or 'fixed thereto, standards 10 and a cross-member 11. The central boss 2 of the base is bored and feathered to receive a screwthreaded sleeve 3 containing a bush 9 keyed thereto, and having fitted therein a keyed locating- bush 15. The screw is adjusted by a hand-wheel 4 having a threaded boss 5 and prevented from axial movement by flanges 7 fixed to the boss 2. Alternatively, the sleeve 3 may be integral with the hand-wheel and the boss 2 screw-threaded, the bush being provided with ball thrust-washers. A plate 8 serves to prevent the access of shavings to the screw. The top bush 14 is keyed to a flanged disk 13, which is keyed to a boss 12 in the crossmember. The bushes 14, 15 are of the same shape as the boss of the levers to be drilled, which is adjusted to the correct position by sight and feel. The lever may be supported at its other end by a ledge 19 on a slotted member 17, which is adjustable vertically on a bolt 18 passing through a horizontal slot 27 in one of four members 16 projecting from the member 11. The member 17 also serves as a stop for preventing rotation of the lever. A second stop may consist of a pin fixed to the top bush or disk. For facing purposes, the bushes are replaced by hollow fittings shaped to grip the lever close to the boss. The fittings may also be provided with sleeves. When drilling or boring both ends of a lever, the free end is held by hand on a locating boss on the member 17, and, on reversing the lever, the drilled boss is located by a pin on the member 17. In a modification for drilling tubes, bushes, rolls, &c., the lower bush has a V-recess for the work, the end of which rests against the end of the member 17 for locating purposes. In a further modification, Fig. 4, for boring a universal joint centre, the disk 13 has projecting arms 24 to receive pins 25 for locating and holding the work on the bush 15, and is also provided with a drill bush 34. The disk may be provided with a bush which registers on the top of the work to test the setting. A rule or straight-edge 26 may rest on ledges 27 on the arms 24 to test the depth of cut in spot-facing, so as to ensure that the finished top of the work is in alinement with the ledges.