Patent GB-190427883-A (GB)
Title: Improvements in and relating to Rotary Screens for Minerals and other Substances.
Inventor: TRAYLOR SAMUEL WILLIAM
Filed: 1904-12-20
Granted: 1905-03-16
Abstract: 27,883. Traylor, S. W. Dec. 20. Screening minerals &c.-Relates to a rotary, concave screen which is reciprocated vertically and has its upward movement arrested abruptly, so that the material being acted upon will be projected upwards from the surface of the screen and move towards the periphery in a series of jumps, thus preventing clogging and undue abrasion. The screen is adapted for use with wet material by fixing a pan immediately below it, so that, when the upward movement is arrested, the film of water and fine material formed upon the pan is projected upwards in the form of jets or waves, thus preventing clogging and irrigating the material on the screen. Fig. 1 represents a central vertical section of one form of the apparatus. The material is fed to the centre of the screen 12<*> by means of a shoot, and travels towards the circumference under the influence of centrifugal force. The coarse material is discharged over the apron 56 into the receiver 50, while the fine material falls into an inner receiver 49, which is provided with a discharge pipe forming part of a casting 52 at the outlet of the outer receiver. The screen curves slightly downwards from the centre and then upwards to the circumference, as shown. It is mounted on a vertical shaft 5, which is rotated by means of bevel gearing 6, 9 and a shaft 10 carried by the framing 1, 2. Lugs on a block 13 on the shaft 5 engage in bayonet slots in a cam-ring 17 provided with teeth having inclined and vertical faces in contact with similar teeth on a ring 16, which is furnished with bayonet slots engaging with lugs on the casing 3. The cam-rings are duplicates of one another and may be interchanged. The rotation of the shaft 5 locks the rings in position, and causes the teeth on the lower ring to ride over those on the upper stationary ring, thus producing a vertical vibration of the screen, which is lifted by the pressure of a spiral spring 15 upon the block on the shaft 5. The upward movement may be arrested by a head 26 coming into contact with an impact-piece 27, preferably of raw hide, at the end of an adjusting-screw 28. The casing 3 holds oil for lubricating purposes, and is fitted with an air-escape cock 60 and an inlet tube 62 closed by a cap. The pinion 9 and block 13 may be screwed so that the rotation of the shafts 10, 5 tends to tighten them. Fig. 2 is a plan of part of the screen, and Fig. 7 a section through the sidebars of two of the frames composing it. The screen cloth is attached to separate sections or frames, as shown, being tacked to the side-bars and the inner bars 36<1> and clamped to the outer faces of the outer bars 36<11 >by strips 36*. The cloth is forced into grooves in the side-bars 36<a>, Fig. 7, by ribbed bars 40, which are clamped to arms 36 radiating from the centre and bridge the small space between two adjacent frames. The central clamping-plate 42 is flanged round the shaft, is provided with pockets 44 for the ends of the bars 40, and is held down by bolts 43* passing through a block 44* pinned to the shaft 5. The bars 40 are secured by links 46 and keys or wedges 47<11>, the links being held in recesses 48<11 >in the keys by springs 48. Fig. 10 shows the screen adapted for use with wet material. The film of water and fine material conform to the shape of the screen, and is formed on the'pan 59, which is fixed to the central shaft. The coarse material is discharged into a launder 60* over an apron 61, and the fine material and water strike the apron I and fall into the hopper L.