Patent GB-189916162-A (GB)
Title: Improvements in Machines for Generating the Teeth of Bevel Gears.
Inventor: DYMOND GEORGE CECIL
Filed: 1899-08-08
Granted: 1899-11-25
Abstract: 16,162. Dymond, G. C., [Leland & Faulconer Manufacturing Co.]. Aug. 8. Milling.-Relates to an emery-disc machine for trueing up the teeth of steel bevel-wheels after they have been hardened, but various forms of cutters may be substituted for the emery disc. A bevel-wheel having involute teeth is caused to rotate on its own axis and to swing about the apex of its cone, as if it were in engagement with a circular rack having teeth with straight sides. The grinding-disc has its working edge shaped to correspond to the teeth of this imaginary rack and, while rotating, is caused to move to and from the axis thereof. The bevel-wheel B is secured upon an interchangeable mandrel 100 fixed in the end of a spindle 99 which is supported in a bearing 4. This bearing is clamped upon a quadrant 3 so as to bring the apex of the wheel into the axis of the quadrant. The quadrant stands upon a table 2, which oscillates in a horizontal plane about an axis which also passes through the apex of the wheel. The rotation of the wheel is derived from the moving table by means of two pinions on a vertical spindle in the table, gearing, one with a curved rack on the frame of the machine, and the other with a straight rack on the slide 14, the motion of which is transferred by pin-and-slot mechanism to a rack slide 24 in gear with a segment A<3> pivoted coaxially with the quadrant 3; another toothed segment A<5>, adjustable on the segment A<3>, gears with the pinion 30 on the spindle 99. In order to allow of the advance of the wheel tooth by tooth, the pinion is secured, not directly upon the spindle, but upon the boss of an arm 105 having a spring plunger to engage the notched disc 104, united to the ratchet-wheel 102, which may be clamped on the spindle at the desired angle. When the arm 105 is in its extreme position to the left, the plunger is retracted by a cam 108, on the spindle 97, mounted in arms on the bearing 4, and, while it remains stationary, the ratchet-wheel, spindle, &c. are advanced by a cam 117 acting upon the pawl 109. The pawl is drawn back by a spring, and is then kept out of action by a fixed shield. The table is operated by a toothed segment 7, in gear with a segment 8 on an arm F which is pivoted coaxially with the lever 46, and may be clamped thereto at any required angle. The lever 46 is adjustably connected to a lever 43 pivoted at b and engaging at e with a cam-wheel 41 geared to the main driving-shaft 33. The spindle 97 is connected by bevel-wheels to a vertical spindle 92, which is coupled by universal joints to a spindle 91 driven from the intermittent gearing 85, 86. The grinding-wheel slide 63, adjustable on a plate 62, is worked to and fro by an eccentric spindle 54 geared to a spindle H on the head 5. which is driven from the shaft 33. The grinding-wheel is moved clear of the bevel-wheel, while this is being advanced, by means of a cam 50 and lever 51 acting on a slide 53 upon which the upper slide 62, 63 is mounted. The grinding-disc 81 is clamped upon a flanged sleeve which is itself clamped against a collar on the spindle. The spindle runs in split taper bushes N, N', adjustable in spherical bearings seated in the brackets 70, which are provided with hinged caps 77 and are formed on the outer of a set of compound slides supported on the face of the slide 63. The pin-and-slot mechanism is made adjustable by pivoting the slotted bar 16 at one end a and adjusting its inclination by means of a screw 20; its outer end is clamped to a slotted wing on the slide 14. The screw 20 is formed with a keyway for a feather on a collar the edge of which is divided up to show, in conjunction with a fixed mark, the extent of the rotation.