Patent GB-190315230-A (GB)
Title: Improvements in Machines for Milling either Right or Left Spirals, Worms or Screw-threads in Metal.
Inventor: HANSON BENGT MAGNUS WILHELM
Filed: 1903-07-09
Granted: 1903-08-27
Abstract: 15,230. Hanson, B. M. W. July 12, A.D. 1902, [date applied for under Patents Act, A.D. 1901]. Screwing; milling; dividing - apparatus.- A machine for milling right and left handed spirals, worms, threads, and teeth, is shown in Fig. 1. Fig. 5 shows a vertical section of the main head 2, Fig. 4 a horizontal section of the cutter-slide 45, and Fig. 15 a vertical section of the steady-rest 75, Fig. 4, which is omitted from Fig. 1. The work is supported at one end by a centre 5, and is gripped at the other end between the chuck-jaws 7 of the hollow spindle 6, which is mounted in another hollow spindle 4, and carries an "indexing " or dividing ring 20, the notches 20<1> of which are engaged by a locked pawl 23, pivoted on the flange 4<1> of the spindle 4. This spindle works in bearings in the head 2, and carries a sliding clutch 29, which may be moved into gear with the friction-wheel 28, or with the worm-wheel 32 by means of a forked lever on the shaft 37, and the handle 40. The wheels 28, 32 are driven in opposite directions, the wheel 28 by belts, and the wheel 32 bv belts and a worm on the shaft 42. The wheel 32 is toothed at 33 to engage with teeth on the clutch 29. The spindle 4 is connected with the screw 18, for traversing the slide 45 along the bed, by means of change-gearing 9, 10, 12, 13, 17, the nut for the screw being toothed on its outside so as to be capable of being rotated in the nut chamber in the slide 45 by means of the handle 121 and a worm on the spindle 119, for the purpose of adjusting the slide. The cutter-spindle 70 is connected by gearing 72, 68, 67, 66, 50 with the belt pulley 51, the shafts 65, 69, 70 being mounted in a cutter-frame 63 provided with trunnions 57, 48. The trunnions are supported in the bearings 47<1>, 47<2> of the transversely-moving carriage 47 of the slide 45, the frame being secured in any position, and consequently the cutter 71 at any desired angle with the work 90, by the screw 59, and the nut 73 on the end of the trunnion 48. The steady-rest 75 is adapted to receive a number of segmental bushes 78 of various sizes, and is fixed in any position on the carriage 47 by the handle 89, cam shaft 88, and binder 83 which slides in the undercut groove 81. The carriage 47 is moved along the slide 46 by the wheel 92 and a screw, and may be fixed by the screw 126. At each end of the traverse of the slide 45, a projection 98 contacts with the adjustable stops 96, 97 on the sliding rod 95, and, by means of the link 100, slotted lever 103, and a link 106, moves the handle 40 from one extreme position into its mid-position, thus throwing the clutch 29 out of gear. After the cutter-slide 47 has been adjusted, the handle 40 is moved by the attendant into its other extreme position, and the spindle 4 is either rapidly rotated by the pulley 28 during the non-cutting stroke of the slide, or slowly rotated by the wheel 32, until the projection 98 contacts with the other stop 96 or 97 and again stops the machine. A spring-pressed pin 108 takes into holes in a plate let into the bed 1, and holds the lever 40 in any of its three positions. When right-handed spirals &c. are being cut, the change-wheels are arranged to move the slide 45 towards the head 2 while the cutter is in operation, the wrist-pin 101 being fixed at the bottom of the slotted lever 103, but, when cutting left-handed spirals, the slide 45 is moved from the head 2 while the cutter is in operation, and the pin 101 is fixed at the top of the lever 103.