Patent GB-190718930-A (GB)
Title: Improvements in Apparatus for Grinding Cylindrical Surfaces.
Inventor: BOGERT JOHN LAWRENCE
Filed: 1907-08-22
Granted: 1908-04-16
Abstract: 18,930. Bogert, J. L. Aug. 22. Surfacing and polishing cylindrical articles. In a machine of the type in which the work is rotated and treated by abrading - m a - terial carried by a reciprocating clamp surrounding t h e work, the clamp, which is mounted on guide - rods, is moved axially without transverse constraint along the work. The clamp comprises two portions 6, 6<1>, Fig. 5, connected by bolts 6<a>, which are pivoted to the lower half and carry washers 6<g> which are pressed down on to the upper half by springs 6<d>, the tension in which is adjusted by nuts 6<k>. To remove the upper half of the clamp in order to insert the work, the tension in the spring is slackened and the bolts are moved out of the open-ended slots in the upper portion into the position shown on the right in Fig. 5. The ends 6<j> of the upper portion of the clamp are so formed that when the bolts are turned back into the slots in the upper poition, to secure it in place, they act like cams to lift the washers 6<g> from the shoulders 6i on the bolts against which they normally rest. Guide-pins 6<b> are provided to prevent relative endlong movement of the two portions 6, 6<1>, and adjustable screw stops 6<c> prevent the two portions from coming too close together. A lining 6 , composed of some substance adapted to hold abrading- material, such as cork, lignum-vitµ, paper, fibrous material, or some metal, preferably lead or some brass and lead alloy, is secured to each portion of the clamp in any suitable way. A metallic lining of low melting - point may be cast in position, dovetail or countersunk recesses being provided to assist in securing it in position. A metallic lining may be used, which is longer than the clamp and is secured by screws. The clamps are mounted between guide-rods 5, one on each side of the work. Split sleeves 5<a> are secured to the rods.5 by screws 5<c> and are provided with pairs of lugs 5<e>, 5<f>, between which lugs 6<m>, 6<n> on the lower portion of the clamp fit snugly. Collars 5<b> on the rods determine the proper positions of the clamp. The work is mounted between a chuck 2<e> carried by a fixed headstock 2 and an adjustable spindle 3<c> carrying a chuck 3<e> and mounted on an adjustable tailstock 3, which is anchored in position on ways 1<a> by a bolt 3b. The work is rotated through a pulley 2<b>. For treating short lengths of articles, such as the axial portions of crank-shafts, the guide-rods 5 are mounted to slide in bearings in pieces 4 which are anchored in position on the ways 1<a> by bolts 4b. The rods are reciprocated by cranks 2k arranged to move in unison, and connecting-rods 2<0> which are actuated by a cross-shaft 2<h>, Fig. 3, at the end of the machine driven through gearing 2<f>, 2<g>. The shaft can be put into action by a clutch 2<i> operated by a handle 2<j>. The crank-pins 2 can be adjusted by screws 2 to alter the length of the reciprocation. For treating longer articles, as shown in Fig. 11, the rods 5 are mounted in standards 4 on a carriage 7, and a suitable reciprocating motion is imparted to the carriage. A worm on a shaft 7 drives a worm-wheel,. which is on the same shaft as the hand-wheel 7<d>, and through gears 7<g>, 7<f>, 7<k> causes the carriage 7 to move along the rack 1<b> secured to the frame 1. The shaft is driven through pulleys 8<e> on the shaft 8<d> and bevel-gears 8<c>, 8<b>, 8<a>. A clutch sleeve sliding on the shaft 7<j> is adapted to engage either of the gears 8<c> or 8<a> and so reverse the direction of motion of the shaft, A rod 11 carrying adjustable stops 12, which engage with a lug 11<a> on the carriage at each end of its travel, moves a pivoted lever 10 which operates the clutch sleeve. A spring-operated pin 13 engages the end of this lever to hold it in position.