Patent GB-408285-A (GB)
Title: Improvements in machines for grinding pins, rollers, tubes and the like
IPC: B24B5/22
Filed: 1932-10-04
Abstract: 408,285. Centreless grinding. DUDGEON, H. A., 201, Warwick Road, Kenilworth, Warwickshire. Oct. 4, 1932, No. 27495. [Class 60.] In a centreless grinding machine for grinding the peripheries of pins, rollers, tubes &c., of the type in which the work is fed between the side faces of grinding and feeding wheels b, bl respectively, a saddle a extending across and adjustable along the bed is provided with means for carrying interchangeably a work-rest, Fig. 2, and a tool-trueing device, Fig. 3, both of which can be adjusted relatively to the wheels during the operation of the machine with parallel and angular movements in a vertical plane ; the wheel-trueing device is also angularly adjustable in a horizontal plane. In the machine shown the saddle a is traversed by a hand-wheel d<1> engaging the screwed end of a shaft d attached to the saddle and sliding in a bracket c<1>. Vertical bosses a<1> at the ends of the saddle receive the stems of carrier heads e<1> which are slotted to receive the ends of a bar g forming the work rest. The two carrier heads are capable of being raised and lowered simultaneously and equally by rotation of a shaft a<3> which operates a worm, wheel, and screw, or rack and pinion gear provided at the lower ends of the stems of the carrier heads. The stems are in two parts, the upper part telescoping into the lower and being threaded to carry a nut f which rests on the lower part and permits of individual adjustment of the height of the head. The bar work-rest g may carry hardened strips g<1> in its upper face, which face may be horizontal, inclined, V-grooved, or of other form. Guides h, h<1>, h<2> are shown in front of and behind the working position ; these may be rigidly attached to the bar, or may be adjustable to and from the central vertical plane of the bar, or vertically, or in both these directions, in order to accommodate work of different diameters. Bars i, i<1>, i<2> may be attached to the guides. A further guide bar j is shown, attached to the bar g by a pair of pivoted links k, k<1>. A screwed rod rotatable by a knob l<2> engages a nut m pivotally mounted in a downwardextension of the link k, rotation of this rod thereby turning the links and causing the guide bar j to move with a parallel motion to and from the bar g. The bar is supported laterally by plates g<2>. A similarly supported and operated guide-bar may be provided at the other side of the work rest. The wheel-dressing tool shown in Fig. 3 is supported in the saddle a interchangeably with the work-rest, and by similar means allowing equal and simultaneous and also independent vertical adjustment of the two end uprights r, r<1>. The uprights carry a bar o on which is mounted the diamond p, and which is traversed by a handwheel s. Provision is made for lateral adjustment of the upright r<1>, this being provided with a flat base r<2> adjustably bolted to a plate r<3> carried by a vertical stem, engaging the end boss of the saddle a. The wheel-dressing device may thus be angularly adjusted in the horizontal plane.