Patent GB-522292-A (GB)
Title: Abrading apparatus
IPC: B24C5/06
Filed: 1938-12-08
Abstract: 522,292. Sand-blast. PANGBORN CORPORATION. Dec. 8, 1938, No. 35802. Convention date, Dec, 22, 1937. [Class 60] Sand-blast apparatus of the rotary wheel type comprises a rotor B carried by a shaft A and having a flange and a plate C spaced from the rotor, abrasive fed by a spout D to the centre of the rotor moving by centrifugal force between the rotor and the plate C to pile up on the rotor flange, from which it is fed to the work, over the edge of the flange, by a rotating disc E. The disc E is so placed that the axis of the disc lies in a plane parallel to a plane passing through the rotor axis, these planes being spaced apart by a distance S such that a line radial to the rotor axis and passing through the centre of the disc makes an acute angle with the plane through the rotor axis ; the point of discharge of abrasive is adjusted by adjustment of the disc around the rotor axis. The rotor B comprises a part secured by screws 11 to a shaft 10 and has on its front face a number of bosses 12 separated by flaring grooves 13, on the faces of which bosses a cone shaped feed member 14 and a circular plate 15 are secured. The periphery of the plate may be spaced from a surface 18 on a flange of the rotor or may have therein slots 27 so that abrasive may pass from the member 14 through the grooves 13 to pile up on the surface 18 and on the surface of a renewable split metal ring 22 sprung into a groove 19 in the flange and located by rivets 23, which enter a groove 21 in the flange. In a modification, Figs. 5 and 6, the rotor has a web 41 with openings 42 near its edge, the web also having flanges 44, 45 at its periphery. The flange 45 receives a ring 46, a spacer 49 and a removable wear plate assembly 51 forming a groove into which the abrasive is fed tangentially by a spout. The wear plates 51 have bosses 56 fitting the openings 42 and slots 57 for passage of abrasive onto the flange 44 and a renewable spring ring 22a; a conical faced discharge ring 64 also is secured to the flange 44. The disc for removing the abrasive comprises' a housing 71 having therein an opening 72 through which projects a member 78 pivotally adjustable about a bolt 74 and having thereon guideways 79 on which is adjustably secured a plate' 81. The plate is adjustable on the guideways by a screwed member 86 secured to the plate and engaged by a nut 91 rotatable in a lug 89. The plate 81 carries a hollow head 96 in which a sleeve 105 is pivotally supported by screws 108 in bosses on the head ; adjustment of the screws moves the sleeve laterally to adjust the distance S, Fig. 2. The sleeve carries a pin 112 fitting slidably in a thimble 113 adjustable along a slot 116 in a bracket 117 on the head 96 so as to adjust the angular setting of the sleeve. In the sleeve 105 is a bearing 121 adjustable axially by screws 126, 127 and in the bearing runs a shaft 139 having thereon two spaced discs 141, 143, which remove the abrasive. In a modification, the groove in the rotor is formed by the web of the rotor and a renewable ring having holes or slots therein through which the abrasive passes on to a flange of the rotor as described above. Excess abrasive falls into a hopper such as F, Fig. 1. The discharge disc may have flattened peripheral portions, or a serrated fluted or grooved edge ; more than one disc or sets of discs may be used, spaced apart around the circumference of the rotor. Specification 518,183 is referred to.