Patent GB-515157-A (GB)
Abstract: 515,157. Jigs. ANGLO - ORIENTAL (MALAYA), Ltd., and RUOSS, W. May 25, 1938, No. 15647. [Class 82 (ii)] In a jig for treating ore-bearing &c. materials wherein a chamber below a sieve is divided into two hutches by a partition with an opening in which is a vibrator for producing pulsion and suction alternately in each hutch, the vibrator is operated by mechanism comprising an eccentric surrounded by a die block slidable in a direction transverse to the axis of the piston rod of the vibrator in a frame connected to said piston rod. The jig comprises a plurality of tanks 1 made of ferroconcrete and bolted together, each tank having a partition 8 in an opening in which is mounted a vibrator comprising two flat cones 9, 10, attached to a metal ring 11 by a flexible annulus 12. Shoulders 7 are formed on the side walls of the tanks, these shoulders resting on a supporting structure 5, the inclination of which is preferably adjustable. Above each tank is a sieve 13 supported on a grid 14, the sieve and grid being held down by rods 16 with their lower ends either forked and straddling the side of the sieve or pivoted thereto and with their upper ends passing through a plate 18 which is seated in a recess below a staple-like member 19. Downward pressure on the sieve is produced by nuts 20 screwed on the rods 16 and bearing on the under side of the plate 18. Water is conveyed to each of the hutches formed by the partition 8 by pipes 21 leading from containers 22 provided with strainers 23. The vibrators are reciprocated by a piston rod 24 which is made in sections connected by screwed sleeves 25 and passes through apertures in the dividing walls made liquid-tight by interleaved rubber and metal rings. The mechanism for reciprocating the piston rod comprises a driving shaft 33 which has a tapered portion 44, the axis of which is eccentric with respect to, but parallel with, the axis of the shaft, upon which portion is mounted an eccentric ring 32 with a tapered bore. The effective throw of the eccentric can thus be varied by turning the ring 32 on the shaft portion 44, the ring being held in any desired position by nuts 45, 46 on cylindrical extensions of the portion 44. Surrounding the ring 32 is a die block 31 which can slide in a frame 30 in a direction transverse to the axis of the piston rod 24, the side members 48, 49 of the frame 30 being formed integrally with shafts 61, 62, respectively, the shaft 61 passing through the wall of a casing 34 which encloses the eccentric mechanism and being coupled to the piston-rod 24 and the shaft 62 being received in a bearing 64. The frame 30 is formed with top and bottom members 50, 51, and side plates 52, 53 to form a box-like structure in which the die block reciprocates. The reciprocation of the die block is utilized to distribute lubricant to the various parts of the mechanism, oil being drawn in to the structure from the outer casing 34 past a non-return valve 57 and forced out past a non-return valve 58 into an oil pipe 59 which delivers into a hole 60 in the top plate 50 of the frame 30, the oil being passed by lubricating passages in the die block to the various surfaces and through passages in the side plates 48, 49 to the shaft bearings, excess lubricant being returned to the outer casing. Specification 452,664, is referred to.