| 摘要 |
903,569. Drilling-machines. GENERAL MOTORS CORPORATION. Jan. 25, 1961 [Jan. 25, 1960], No. 2912/61. Class 83 (3). A machine tool comprises an angularly and laterally adjustable spindle head 300 and a rotary work-table 68 mounted on a support 70 pivoted to a horizontally movable table 30. In a drilling machine, variable-speed motors 20 rotate the spindles and the feed mechanisms, the speed changes being effected by drive units 22, 24. The table 30 is movable on tubular guides 38, 40 by a screw 42 rotated by hand wheels such as 46. Power drive of the table is controlled by levers 54, 56. The work is mounted by T-slots and screwed holes in the table 68 which is rotated on the support 70 by a ring gear 94. The support is adjusted about a pivot 76 by a hand wheel 88 and a segmental gear 82 on a table 58 rotatable on the table 30. The means for rotating the table 68 include worm gearing 100, a sprocket 130, a double gear consisting of twin chains 132 surrounding an annulus 134, and a sprocket 138. The latter sprocket can be rotated through a chain 144 and hand-knobs, or through bevel gearing 142, clutches controlled by hand-levers and the variable speed motors 20. Similar means are provided for adjusting the table 68 by a handcrank 196 or the motors 20. Hand levers 206, 210 are connected to means for locking the tables in position. The spindle head 300 is adjustable angularly on a slide 262 which, with associated feed means 252, spindle drive means 254 and a traverse screw 256, is mounted on a column 248 rotatable on a slide movable on guide rods by a hand wheel 226 or the motors 20. A second spindle head 306 is angularly adjustable on a slide 330 and locked by a screwed plate 336. The slide 330 is movable on a rail 324 angularly adjustable by trunnion plates 326, 328 locked by levers 354, 434 to slides 312, 314 movable vertically on columns 308, 310. |
