GB350957A - Improvements in or relating to centerless grinding machines - Google Patents

Abstract

350,957. Centreless grinding machines. CINCINNATI GRINDERS, Inc., 3058, South Street, Cincinnati, Ohio, U.S.A.-(Assignees of Booth, C.; Cincinnati, Ohio, U.S.A.) Jan. 18, 1930, No. 1829. Convention date, Feb. 1, 1929. Addition to 311,328, [Class 60, Grinding or abrading &c.]. [Class 60.] A machine for grinding tapered, flanged and like articles consists of a base 10 supporting a cylindrical grinding- wheel 12 and a slide 13 on which is adjustable a second slide 14 carrying a tapered regulating-wheel 16 of abrasive material, cast-iron, &c. The work supporting means is carried by the slide 13 and comprises a bracket 20 carrying the rotatable base 22 of a column 23, the base having an extension adjustable by lock screws and a scale. Secured to the column 23 is a shoot 30 to receive the work-pieces 17 and a guiding slide 31, which is provided with a tapered support 37, whereby the work is lowered into position for grinding and raised for ejection down a shoot 38 after grinding. The slide 31 is moved by its connection with a piston rod 32 carrying a piston 34 movable in a cylinder 33 provided with ports 35, 36. Unground work-pieces are placed in a shoot 41 and are released one at a time to rest on the support 37 by movement of a spring-pressed detent 42, which is lifted during the upward movement of the slide 31. The work is supported between the wheels 12, 16 by a blade 45, which may form part of the support 37, and the tapered form of the wheel 16 holds the work with its flange 18 against a wall of the shoot 30 during grinding. Grinding to size may proceed by the gradual fall of the work between the wheels 12, 16, or by an outward movement of the wheel 16 to allow the work to rest on the plate 45 followed by an inward movement of the wheel 16. These movements of the wheel 16 are produced by movement of the slide 13 through a screw 46, operable by a wheel 49, and swivelled in a slide block 47 movable in a bracket 50 by links and a toggle arm 52, which is movable by a cam-plate on a shaft 54, the shaft being rotated, through worm gearing 55, 56 from a motor 58. The shaft 54 also carries a valve 60 provided with chambers 61, 62 and rotatable in a casing provided with ports so spaced as to supply pressure fluid at the required intervals to the cylinder 33 for introduction and ejection of the work.