Patent GB-409806-A (GB)
Title: Improvements in and relating to washer boxes for coal
IPC: B03B5/24
Filed: 1932-11-24
Abstract: 409,806. Jigs. SIMON-CARVES, Ltd., Bird Hall Lane, Cheadle Heath, Cheshire, ADAMS, V. H., Tygwyn, Longhurst Lane, Mellor, Derbyshire, and BANKS, H., 37, Ladybridge Road, Cheadle Hulme, Cheshire. Nov. 24, 1932, No. 33208. Addition to 381,735. [Class 82 (ii).] In a jig washer as described and claimed in the parent Specification the motion imparted to the actuating member of the rotary shale valve from the source of power is governed by a fluid-actuated clutch, the supply of fluid to the actuating means for the clutch being regulated by a valve controlled by the float on the shale bed. A manually controlled speed-regulator, for example, a pair of cone pulleys each consisting of a fixed half and a sliding half, may be provided either between the source of power and the clutch or between the clutch and the rotary shale valve. In the form shown, the actuating member 2 of the shale valve 1 can be connected by means of a clutch through either high speed or low speed gearing to a shaft 5 driven by a source of power, for example, an electric motor 4. The clutch is actuated by a lever 6 moved by a rod 7 connected to a piston working in a cylinder 8. Fluid under pressure, e.g. compressed air, is supplied to and exhausted from the cylinder by pipes 9, 10, the supply being regulated by a valve 12, for example, a rotary valve or a disc valve, worked by a chain 13 carrying the float 14 at one end and a counterweight 15 at the other. In Fig. 1 rotary shale valves are shown at each end of the washer box and, if desired, the valve at one end may be connectible to the shaft 5 through a single gear only, one of the pipes 9, 10 being omitted at this end of the box. In the form shown in Figs. 2 and 3, disc valves are used to regulate the supply of fluid to the cylinder 8. Two air boxes 28, 28<1> are provided, connected by pipes 29, 29<1> respectively to the fluid supply and having take-off tubes 39, 391 each connected to one of the pipes 9, 10. The boxes 28, 281 contain pairs of discs 26, 27 and 26<1>, 271 respectively, mounted on stems 24, 25 having rollers 22, 23 at their upper ends, the rollers being acted on by the faces of cams 18, 19 mounted on a shaft 17 which carries a sprocket wheel 16 over which passes the chain 13 carrying the float. As the float rises, one of the cams acts on one of the rollers and depresses one pair of discs, allowing air to pass to one side of the piston in the cylinder 8. The air from the other side of the piston exhausts from under the upper disc of the other pair and the piston moves the clutch to connect the shaft 5 and the member 2 through the low-speed gear. If the float rises further, the other roller and pair of discs are depressed and the air supply is changed so that the piston moves in the reverse direction and effects connexion through the high-speed gear. An air release in the form of a tap may be provided at one end of the cylinder to facilitate the change-over from the high speed to the low speed position. A rotary valve which comprises a sleeve rotated within a casing by the movement of the float and which may be used instead of the disc valves is described with reference to Figs. 4-5<a> (not shown).