Patent GB-343302-A (GB)
Title: Improvements in and relating to machines for boring or turning railway wheel tyres and similar articles
IPC: B23B5/28
Filed: 1930-02-05
Abstract: 343,302. Boring and turning mills. CHIPPERFIELD, W., 16, Ashburnham Gardens, Harrow, Westminster. Feb. 5, 1930, No. 3884. [Class 83 (iii).] In a vertical-turning or boring lathe for finishing wheel tyres or similar articles the work 3 is mounted on a horizontal table 1 and a tool turret or holder 4 mounted above the work and movable axially and radially in relation thereto is mounted on a saddle 15 of right-angle triangular section, one face forming a vertical guideway 16 for the tool holder and the horizontal side 18 having spaced seatings moving on guideways 19 on the machine bed. The table is driven from a motor 14 through a rope drive 12, 13, shaft 11, worm gearing 10, shaft 8 and pinion 7. The tool turret is mounted in a head 5 which is vertically movable on the guides 16 by a screw 20 driven through worm gearing 21, shaft 22, and change speed and reversing gearing 23 from a separate motor, the speed changes and reversing being effected through hand-levers 24, 25, and lever mechanism. A counterweight 26 supported by cables 27, 28 balances the weight of the turret head, The saddle is prevented from lifting by means of members 32 engaging the undersides of the guides 19. Movement of the saddle along its guides is effected from a motor 35 which drives a screw 34 through gears 36 .. 38 and worm gearing 40. The saddle screw may also be rotated from a hand-wheel 41 acting through a gear train 42 .. 46. The tool turret, Figs. 4 and 5, comprises a cylindrical block 47 having recesses forming supporting faces 48 for multiple tools 50 which are clamped in position by bolts 55 and clamping pieces 54. Projections 49 are provided on the block to support the tools with their cutting faces 56 disposed radially of the turret. The turret is locked by a power-operated axiallymoving member acting through levers (not shown), and rotation of the turret to bring the required tool into position against a setting stop 59 is effected by worm gearing from a hand-wheel 57. The worm may be disengaged and the turret operated directly when desired. A jib crane 58 is provided for lifting the work on and off the table. In a modification, Fig. 6, the machine is provided with an additional tool-holder 4a mounted on a second saddle 15a, the two saddles being connected integrally together at their lower parts by a bridgepiece 60. The vertical movement of the tool holder 5a is effected by a screw 20a driven in a manner similar to that described above for the screw 20. In this modification, the holders 5, 5a, are provided with arms 61 to which are pivoted lever devices 65 carrying grippers 66 engageable with the edge of a work piece. The grippers may be lifted clear of the tools when not required by means of weighted bell-crank levers 63. The machine is provided with feeding - rollers 69 adapted to receive a rough blank and with delivery-rollers 70 to receive the finished wheel. In operation, in the position shown in Fig. 6, the grippers 66a are lowered to pick up a wheel 71 from the feed rollers while the turret tools operate on a blank 72 mounted on the table. When this operation is complete, the finished blank is raised by the grippers 66 and the saddles moved to the right by a screw 34, driven from a motor 75 operating through a change-speed and reversing gearbox 74 controlled by hand-operated lever mechanism. This movement brings the blank 71 above the work table, on to which it is lowered and secured while it is turned by the - tools in the holders 4a. Meanwhile, the finished blank in the grippers 66 is lowered on to the delivery rollers 70. The saddle is then moved back to position shown in Fig. 6 and the. cycle of operations is repeated. If desired, the holder 4a may be replaced by a second turret such as 4, or, alternatively, only a single turret or holder may be employed, the saddle part 15a serving to pick up and convey the wheels to the table.