Patent GB-958351-A (GB)
Title: Improved machine for snagging slabs
IPC: B24B27/00
Filed: 1963-04-10
Abstract: 958,351. Grinding. COMPAGNIE DES MEULES NORTON. April 10, 1963 [April 19, 1962], No. 14436/63. Heading B3D. A machine for snagging slabs B, Fig. 1, comprises a grinding wheel carried by an arm 1 or equivalent device for grinding one face and one edge of the slab which is supported by its other face and edge on an inclined table 13 movable on rollers 16, 17. The grinding wheel, which is surrounded by a hood 8 connected by a flexible hose 9 to a suction duct 10 and collector 11, is mounted at one end of the arm 1, the other end of which is connected to a carrier arm pivotally supported by side frames 3. An intermediate arm 6 extends from the arm 1 and is connected to a jack 5 which, together with a jack 5a, is operable to move the grinding wheel, which is beltdriven from an electric motor 4, so as to traverse the face and upper edge of the slab. A distortable lining 14, for example, of asbestos beads, supports the slab on the table 13 which has rails 15 engaging the rollers 16, 17, the spindles 18, 19 of which are mounted in a frame 20. The rollers are driven by a power-driven shaft 22 to traverse the slab past the grinding wheel. Swarf from the grinding operation is collected in casings 23, 24 which open into members 25 mounted on rails and communicate with ducts 26, 27 leading to the collector 11. The rails of the table also engage further power-driven rollers 34, 35, Fig. 2, which are similarly disposed to the rollers 16, 17 and associated with yokes 40, 41 carrying power-driven rollers 38, 39, the yokes being movable to bring the rollers 38, 39 into engagement with the upper face of the slab to hold it on the table and urge the table against the rollers 16, 17, 34, 35, the rollers 38, 39 also assisting in the traversing of the slab. After one face and one edge of the slab have been ground, the slab is moved to a supply and handling station wherein the slab is reversed to enable its other face and edge to be ground. The station has an inclined set of rollers 50, Figs. 2 and 5, leading from rollers 49 which initially receive the slab B1 and can be lowered by jacks 47 to deposit the slab on the rollers 50 for conveyance to the table 13 which, at this time, is engaging rollers 54, 55 on a support 51 having apertures through which the rollers 50 protrude sufficiently to permit the edge of the slab to move to the position B2 to engage the short face of the table. The support 51 is movable about a pivot 52 by a jack to a position 63 in which the slab is in position B3 and the table can be advanced by the rollers 34, 16, 17, 35 and the upper rollers 38, 39 to the grinding wheel for the first face and edge of the slab to be ground. Thereafter, the slab is returned to the position B3 and the support 51 and table lowered to a position 64 to enable the slab to move on the rollers 50 to a position B4 in which it is engaged by arms 56 which can be raised by an electric motor and gearing 58, 59 to a position B5, the support 51 also being again raised at this time so that the slab is clamped between the arms 56 and support 51. The arms and support are then moved together to move the slab to position B3, the arms 56 returned to their initial position, and the slab advanced on the table 13 for its other face and edge to be ground. The jacks and motors controlling the movement of the grinding wheel and the slab may be operated by controls 32 on a platform or cabin 31, Fig. 3, movable on guides 29 to enable the operator to easily examine the surface of the slab.