Patent GB-162775-A (GB)
Title: Improvements in ore concentrating machines
IPC: B03B5/04
Filed: 1920-02-03
Abstract: 162,775. Williams, C. J. Feb. 3, 1920. Vanning-machines.-Relates to ore-concentrating machines of the type in which the reciprocation of the table is obtained by two sets of toggles, of which the ends of one set are adjustable vertically for varying the stroke of the table obtained by the use of the toggles, and a pitman, which is operated from below the thrust-bar and is eccentrically and adjustably mounted, and in which also the thrust-bar is arranged in line with the table. The following improvements are also applicable to shaking screens, sifting machines and the like. Head-motion. The thrust-bar g<1> Figs. 1 and 2. and the compression spring j are arranged in direct line with the table the thrust-bar being operated from the driving shaft c by a pitman e<1> and two sets of toggles f, f<1>, the outer ends of the set f being seated on a yoke g rigidly attached to the thrust-bar while the outer ends of the toggle f<1> are attached to a stroke-adjusting block h. The end of the thrust-bar is attached to the thrustbolt of the table k<1> by a swivel head g<2> and the upper end of the pitman e<1> and the stroke-adjusting block h are forked to span over the thrust-bar. Adjusting stroke of table. The driving-shaft c, Figs. 1 and 2, is provided with a toothed sleeve l adapted to engage teeth l' provided in a slot d<1> of the eccentric sheave d. On each side of the sleeve l is a driving disc l<1>, l<2> fast with the shaft and provided with a pin l<3> whereon the eccentric sheave d is pivoted. The sleeve l is kept normally engaged with a further sleeve l<5> by a screw l<10>, which when removed, allows the sleeve l<5> to be rotated so as to alter the throw of the eccentric. The stroke-adjusting block h is vertically adjustable by its screw h<1> and hand-wheel h<2>, while the length of stroke of the table may be ascertained by an indicator n. Table bearings. The table-supporting means comprises an upper and lower portion, the upper portion consisting of a hanger p<4>, Figs. 5 and 6, fixed to the table, carrying a spindle p<5> and roller p<6> located in a roller track p on the lower portion. The lower portion has a downwardly projecting round pin p<1> which fits in a socket p<2> carried by channel irons o<1> and is capable of vertical adjustment by a screw p<3>. Table-tilting gear. The table is tilted by rotating a tilting shaft o<3>, Figs. 5 and 6, which carries a fork o<9> engaging a pin o<10>which stands out at right-angles from the lower portion of tilting yokes o. The tilting-yokes are fixed to channel irons o<1> whereon the table k<1> is supported and are carried in tilting chairs o<2>. An indicator is fitted to determine the degree of tilt of the table. Table. The table, Figs. 6 and 12, comprises a central girder k<2> to which is attached the drawbolt k. The lattice girders k<6> connect the central girder with the bearers k<7>, the table being tied from side to side by means of metal straps k<8> and further lattice girdering k<9>. Launders. The dividing launders consist of a length of channel steel having a bracket which can be clamped at any point along the side and end plates of the table by a set screw. Water-box. The water-box consists of a reservoir g, Fig. 11, and a valve chamber q<1> separated by a perforated longitudinal division board q<2>. Water flows from a pipe q<4> into the reservoir q thence into the valve chamber q<1> and through short lengths of tubes q<10> secured in the bottom of this chamber on to the table. The whole is carried by brackets q<12>, Fig. 6, secured to the tilting channels o<1> and may be levelled by a screw adjustment q<11>. Drip-board. The drip-board consists of a box r. Fig. 9, approximately at right-angles to the water-box and receives water from the reservoir q through a pipe r' controlled by a flap valve r<2>.