Patent GB-190106784-A (GB)
Title: Improvements in and relating to Machinery for Grinding or Abrading and other similar Operations
Inventor: BROOKES ALFRED GEORGE
Filed: 1901-04-01
Granted: 1901-07-20
Abstract: 6784. Brookes, A. G., [Norton Grinding Co.]. April 1. Surfacing and polishing.-The machine is applicable for grinding straight, cylindrical, and taper work. The work is rotated between centres on a headstock D, Fig. 15, and a tail-stock E, Fig 3, which slide on and are adjustably clamped to a table C having roughly a triangular section, with the slides 28 and 29 some distance apart, and roughly vertically beneath and level with the centres and axis respectively, of the grinding-wheel 220. The bearing- faces 45, 43 are respectively flat and angular, as shown. The table C is pivoted at 21 to the carriage B, and can be set at an angle to it for taper work by rotating a worm which engages with a rack pivoted to the carriage B. The carriage has flat and angular faces 18, 17 for sliding on the base a<1>, which is roughly of T-form in plan, the work being fed along the horizontal part of the T, and the grinding-wheel carriage along the stem of it. A water tank is placed in one angle of the T, and from it water is pumped into the tube 228, whence it drops on to the grinding-wheel and work. Water guards are arranged at 30, 32, 33, and 36, which pass the water directly back to the tank. The work is rotated at a variable speed by a stepped pulley 60, Fig. 15, supported by pivoted arms 63. The weight of the pulley keeps the band tight wherever it is placed on the pulley. Between the steps the pulley is conical, to facilitate shifting the band, which passes through the loop 68 on an adjustable slide. The work is fed by a rack 78 fixed to the carriage B. A spur-wheel gears with this rack, and is driven either by spur gearing from the shaft 117 or, when disconnected by a clutch, by a hand-wheel. The gearing just referred to includes a cup-shaped bevel-wheel with which engage two bevel-wheels loose on the shaft 117. A clutch on the shaft 117 couples these bevel-wheels alternately with the shaft to reverse the travel of the carriage. The clutch is operated by the lever 131 through a spring tripping-device, which ensures that the clutch always engages with one of the bevel-wheels. All this mechanism is carried by a single plate fixed to the front of the machine. The lever 131 carries a pin 166, which is struck by adjustable dogs on the carriage B to reverse automatically the motion of the carriage. The dogs do not hinder the carriage from being fed by hand to any extent, as they are shaped so as to ultimately piss beneath and beyond the pin 166. The automatic feed, as determined by the position of the dogs, remains unaffected by the hand feed. The speed of rotation of the shaft 117 is varied by variable - speed gearing operated by a clutch and by cone pulleys, the band over which is kept taut by the weight of idle pulleys. The grinding-wheel carriage is operated by a squarethreaded screw 240, which bears against the piece 248, engages with the half-nut 250, and rotates in an oil bath. The shaft 233, Figs. 3 and 11, of the screw carries a spur-wheel 251 engaging with a wheel fixed to the ratchet-wheel 259. The grinding-wheel is fed automatically at each traverse of the work-support by the lever 131, having the arm 307 to which is adjustably clamped the rack 297 engaging with the pinion 295 fixed to the crankpin 298'. This pin is connected to the pawl 301 by a link 298. The feed is varied by shifting the clamp. The feed may be stopped automatically at any point by the shield 305, which is carried by the arm 267 and may be fixed to the wheel 259. The grinding - wheel may be fed rapidly by hand by turning the wheel 263 fixed to the arm 267. This arm carries a very small spur-wheel engaging with the feed-wheel 259. For rapid hand feeding, the spurwheel is locked to the arm. For very fine hand feeding, the arm 267 is locked by the nut 265, and the spur-wheel is rotated, the spring pin 287 fitting into one or other of the holes 292 in the fixed disc 290.