Patent GB-229062-A (GB)
Title: Improvements in and relating to machine tools of the vertical wheel lathe type
IPC: B23B5/28
Filed: 1924-01-14
Abstract: 229,062. Marks, E. C. R., (Niles-Bement- Pond Co.). Jan. 14, 1924. Boring and turning mills; chucks; lathe drivers; mandrels.-In a vertical lathe, particularly for turning the contour of the tread and flange and facing one side of the hub of rolled steel car wheels, the wheel is drawn into driving engagement with a number of dogs mounted on a rotary table by means of a clamping member having jaws engaging the bore of the wheel and carried on a power-actuated vertical shaft, and the turning operations are effected by means of tools carried in slides having independent automatic feeds. The rough wheel W is raised by a pneumatic hoist 3 on to a table 2, which has a conical bearing surface engaging the ring 8, and is secured to a vertical spindle 10 carried in bearings 11, 12. The table is rotated from a shaft 14 through gears 23, shaft 20, bevel gearing 24, and spur gearing 28, the shaft 14 being driven either directly or through back gears from a motor 13. The large driving wheel 28 is mounted below the floor line to avoid interference with the working of the machine. The work is centred on the table by means of devices each comprising a member 39, pivoted to a nut 37 and connected by a link 40 to a second nut 38, the nuts 37, 38 running respectively on fine and coarse threads provided on an adjustable sleeve mounted on a spindle 33, the spindles being interconnected for simultaneous adjustment by bevel-gearing 42. The table is further provided with work-driving members each comprising an adjustable base 29 having a serrated driving-jaw 31 and a hook clamp 32 adapted to be engaged with the inner portion of the wheel rim by means of a. wedging key. A shaft 44 within the work-supporting shaft carries a screwed extension 49 having a conical bushing 45 provided with spring-pressed work-engaging jaws 47, and the shaft 44 is centred by pivoted pawls 54 in a bushing 53 secured axially within the spindle 10. The shaft 44 is normally held in its raised position by means of a weight 57 carried on cords passing over pulleys mounted in the bushing 53, but in order to draw the work into firm engagement with its driving dogs the shaft 44 is forced downwards by means of a pivoted arm 59 actuated by a wedge operated by a fluidpressure cylinder 65 carried by the driving wheel 28. The shaft 26 is extended upwardly at 67 and is connected through bevel gearing 69 and changespeed gearing 73 to a. horizontal shaft 71 from which the horizontal tool slides 4. 5 and the vertical tool slide 6 are operated through the gearing shown in Fig. 10. The tool slide 4, guided by gibs 91, 92, comprises a tool holder 93 vertically adjustable by a screw 94 and carrying a profiled tread-turning tool 95. The front of the tool holder 93 carries a second adjustable tool holder 98 carrying tools 100, 101 for respectively finishing the inner and outer portions o@ the wheel rim- An auxiliary tool holder 102 is pivoted to the holder 98 and is adapted to carry a tool which may be swung downwardly for cutting a wear line on the wheel. The actuating means of the slides 4 and 5 are similar and each comprises a worm-wheel 107 on a shaft carrying a loose wheel 109 keyed to a hand-wheel 110 for manual operation of the slide 4. When the power feed is required a splined clutch member is engaged by means of a hand-wheel 117. A second clutch 104 operated either from a pedal 120 or automatically may also be used to disengage the power feed, the automatic disengagement being effected by an adjustable dog 126 on the slide 4 which operates to shift a lever 123 from its position above a spring-pressed vertical rod 121 connected through lever mechanism, Fig. 6, with the clutch 104, thus releasing the rod to disengage the clutch. The vertical slide 6 is counterbalanced by a weight 135 and its feed' is also controlled by manual or automatic clutch mechanism. The operating worm-wheel 89 is loose on a shaft 90 to which it may be connected by a splined clutch 128, the shaft 90 being provided with a wheel 129 for hand adjustment of the slide. The clutch 128 may be manually operated from a pedal 140 while automatic operation is effected by an adjustable dog 152 fixed in an annular slot in the face of one of the gears 149 of the feed train, this dog being arranged to shift a lever 147 from the path of a spring-pressed rod 144 connected by lever mechanism to the clutch 128.