Patent GB-534823-A (GB)
Abstract: 534,823. Jigs. MOIR, H. W. Sept. 7, 1939, No. 25301. [A Specification was laid open to inspection under Sect. 91 of the Acts, March 4, 1940.]. [Class 82 (ii)] In a jig of the kind comprising ,a sieve arranged above hutches, each hutch being provided with an opening over which is disposed a reciprocating vibrator, the hutch or hutches are formed with converging sides, one of which is covered with a flexible diaphragm operatively connected to one arm of a bell-crank lever the other being connected to reciprocating means transmitting a pulsating movement to the diaphragms. Flexible diaphragms 66, Fig. 1, are secured in openings 65 in the side walls cf hutches 16 and are provided with plates 74 carrying stems 73 which are pivoted at 72 to one end of bell crank levers 71 pivotally mounted at 70a in flats 70 secured to the walls of the hutches 16. The levers 71 are provided with arms 71a which are connected by links 76, 76<SP>1</SP> to the collar 77 of an eccentric 78. Fixed to a motor shaft 80, Fig. 3, is a block 81 which is adjustable upwardly and downwardly in an opening 79 in the eccentric 78 and provided with a circular flange 81a. The front face of the eccentric is provided with grooves or serrations 78a, Fig. 4, which co-operate with similar grooves &c. on an annular washer 83 secured on the shaft and held up against the outer end of the parts 87 by a nut 84. The slot bed 37, Fig. 1, is supported on a grid 38 mounted on a strip 48 secured to the wall 15 of the hutches 16 and is provided with upstanding side portions 38b having ears 39 in which are held the T-shaped ends of screw-threaded bolts 40 passing through bearings 41 carried by the main frame and provided with nuts 42 to adjust the position of the grid 38. The bed 37 is divided into sections by an upper grid 46. Openings 17 in the bottoms of the hutches are controlled by slide valves comprising sliding plates 18 having openings therein of " tear drop shape " and operated preferably manually, to open and close the entrances to parts 20. Adjustably supported by the hooked ends of screw-threaded rods 34 secured to side members 27 of the main frame is a baffle 30 provided with baffle plates 31 having curved lower edges 31a so that a nozzle action can be induced in the material to be treated as it passes thereunder from a sluice trough 25 and produce froth or flotation as indicated at F, of any insoluble matter such froth &c. being carried into the turbulent liquid being treated by the jig. Water is supplied to the hutches through an opening 50a in a pipe 50 and is distributed by a deflector 58. The pipe 50 is connected to a pipe 56, Fig. 2, which supplies a small volume of water at a low pressure and to a pipe 51 which supplies water at a higher pressure through a valve 52 by a pipe 53. The valve 52 is provided with a cup 90, Fig. 3, mounted on the shaft 80 carrying the eccentric 78 and also with an opening 93 extending a short distance round the circumference so that by the rotation of the cup an intermittent flow of water from the pipe 57 is produced through the valve 52 and into the pipe 53. In a modification the levers 71 are connected to the spring-controlled core of a solenoid which is connected through a source of electrical energy to shoes which are adapted to contact with a notch plate forming part of the circumference of a disc mounted on the shaft 80.