| 摘要 |
1,105,067. Boring and facing heads. E. WOHLHAUPTER, and E. WOHLHAUPTER, [trading as EMIL. WOHLHAUPTER.u. CO.]. 14 Oct., 1965 [16 Oct., 1964], No. 43669/65. Heading B3C. A boring and facing head comprises a plurality of pairs of planetary gears 18, 19 any pair of which can be connected between a pair of central toothed rings 16b, 22 for displacing a cross slide 13 relative to the main body 11 of the head, each of the pairs of gears 18, 19 being connectable through inclined dog faces (18b), (19b), (Fig. 5, not shown) to complete the drive. Each pair of gears 18, 19 give a different feed rate to the cross-slide and selection is achieved by push button 26 acting through lever (33), (Fig. 3, not shown), to push the dog faces (18b), (19b) of the gears together. Release of a pair of gears is achieved by knob mechanism 75, (Fig. 2, not shown). Pneumatic, hydraulic or electromagnetic means may also be used (Fig. 4, not shown) to select and release a pair of gears. For returning the cross slide at a faster speed a retaining ring 25 is locked to a scale ring 16 by a retainer pin (48), (Fig. 3, not shown). In operation the retaining ring 25 is held stationary by rod (43) while the head rotates and actuation of the push buttons 26 couples the gears 18, 19 and drive scale ring 16 to operate, through pinion 15 and toothed ring 16a, the cross slide. The planet gears and toothed rings may have their teeth inclined so that a displacement force urges the said gears out of engagement with the dog faces. The displacement force is reacted by a spring and ball catch acting on the push button 26 which is released if the transmitted torque is too high. |
