GB637206A - Improvements in or relating to machines for centrifugal casting - Google Patents

Abstract

637,206. Centrifugal casting-machines. WOOD, D. H. Nov. 28, 1947, No. 31500. [Class 83 (i)] Metal-pouring apparatus.-A centrifugal casting-machine has an interchangeable mould 10 which can be driven at any speed, up to a predetermined maximum, by a constant-speed motor 43 through an electro-dynamic clutch 42. The field windings of the clutch are supplied with manually-controlled continuous current, which may be derived from a rectifier and the motor may be driven by alternating current. The clutch may be connected by a driving belt or belts 16 to a pulley on the shaft 15 of rollers 13 which, with rollers 12, support the mould. This can be held down by a spring-pressed roller 17, Fig. 2, on a crank-lever 19, the arm 24 of which is adjustably connected to a lever 23 operated by a fluid-pressure cylinder 22. Unintentional lifting of the roller 17 is prevented by a cam 27 operated by a spring 29 to engage an arm 28 of the lever 23 and withdrawn, when required, by a cord 31 and hand lever 30. The rotation of the mould may be stopped by a treadle-operated brake 32. The funnel 35, through which a measured quantity of metal is poured into the mould, is carried by a frame pivoted at 36 so that it can be swung aside. This frame carries a guard 37 and another guard 38 is pivoted at 39. The mould may be of metal with a thin lining of refractory material sprayed on the preheated mould, or of sand in a metal flask. The funnel may have a nozzle designed to give a desired rate of flow and be lined with sand. The Provisional Specification states that an electrical brake may be incorporated.