US1499847A - Ore-concentrating machine - Google Patents

Description

July 1, 1924 C. J. WILLIAMS ORE CONCENTRAIING MACHINE Filed Jan. 22 1921 2 Sheets-Sheet l Ira/awn" July 1, 1924; 1,499,341 Cr J. WILLIAMS ORE CONCENTRATING MACHINE Filed Jan. 22 1921 2 Sheets-$heat me nt 77 m g,

Patented July 1, 1924.

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CHARLES JO'HN WILLIAMS, OF CBOYDON, ENGLAND.

ORE=CONGENTBATING MACHINE.

Application filed January 22, 1921. Serial No. 439,106.

To all whom it may concern:

Be it known that CHARLES JOHN WIL- LrAMs, subject of George V, King of Great Britain and Ireland, residing at 6 Lennard Road, Groyclon, in the county of Surrey, England, has invented certain new and useful Improvements in Ore-Concentrating Machines, of which the following is a specification.

This invention is intended for application primarily to ore-concentrating machines though, in respect of certain of its features, it is equally applicable to shaking screens, sifting machines and the like.

The chief object of the invention is to improve the construction and operation of machines of the class referred to in respect of the head motion.

The range of adjustability of the tablestroke obtainable by means of the adjustable toggle seat-block employed in previously constructed ore concentrating machines 1s subject to certain important limitations, usually ranging from about minimum to 1%" maximum. This is a defect which renders such machines unsuitable for the efficient treatment of grades or classes of ores requiring a stroke either below or above these limits. Now, by this invention, this defect is overcome by making provision for extending these limits in both directions so that the stroke can be varied from any required minimum, no matter how small, to any required maximum.

-According to this invention, the motion of the pitman is obtained preferably by means of an eccentric of variable throw instead of,

as heretofore, by means of a crank of fixed throw. It is this eccentric of adjustable throw which, by enabling the length of travel of the pitman to be varied, renders it possible 'to widen the range of adjustability of the stroke of the table.

In order that this invention may be the more clearly understood and readily carried into efl'ect, I will proceed to describe the same with reference to the accompanying drawings, which illustrate the preferred constructional form of this invention and the application of the same, by way of example, to an ore-concentrating table of the Wilfiey type.

Figure 1 is a vertical longitudinal section through the head-motion.

Figure 2 is a section substantially on line 22 of Figure 1.

foundation channels of the machine on;

which is fixed the lower base plate I) wherein is mounted the driving shaft 0. Mounted on the shaft in the manner presently to be described is the eccentric sheave d which carries the strap 6 of the pitman e whose upper end has seated therein the inner ends of the toggles 7"v and f the outer ends of which are seated on a yoke gand stroke-adjusting block h respectively. The periphery of the eccentric sheave is rounded and the strap is shaped to correspond. Thus, the pitman is enabled to adapt itself to any twisting or lateral movement to which it may be subjected, thereby increasing the smoothness of running of the machine.

The yoke g is attached rigidly to the thrust bar 9 which is surrounded by a compression spring j bearing at its ends a ainst loose flanged rings 7' and 3' respec ively. The ring j bears against the yoke g and the ring 7' bears against an end cover which is screwed into a casing 7' and forms a bush within which the tail of the thrust-bar works. The casing j encloses the spring and is fixed to the upper portion 6 of the base plate. By means of the screwed cover 7' the tension of the spring 3' can be regulated. i 4

The thrust bar g is straight and solid and extends through the head motion, and

through thebearing 6 being connected at its front end to a swivel head g which in turn is connected to the thrust-bolt tor the table Surrounding the neck of the draw-bolt is a plate 70 which is secured to the top end of the table. In order to remove the draw-bolt it is merely necessary to remove the plate 70 and the bolts 10*. The upper-end of the pitman, also the stroke adjusting block, are made saddle shaped or forked so as to span over the thrust-bar.

It will be noticed that the thrust-bar and compression spring are in direct line' with the table. By this arrangement, side strains are avoided, the machine works very smoothly and there is only the minimum of.

wear on the'bearing V.

Z is a sleeve which is rotatably. mounted on the driving shaft 0, Z and Z are driving discs which are fast on the shaft and are 'in Figure l.

provided with a pin Z whereon the eccentric sheave'cl is pivoted. The sheave sur ounds the sleev Z, and the disc Z is h d to the shaft by means of a screw Z whose inner end passes through a transverse slot a further sleeve Z The two sleeves are clutched together along the broken line Z but are made separable from one another for convenience of assembling and dismantling.

The sheave (Z is provided with a slot (Z which is concentric with the axis of the pivot pin. The sleeve Z and the slot (Z are provided with teeth Z and (Z respectively which mesh with one another.

The end of the shaft which is remote from the drivino' and loose pulleys m and m respectively 1S provided with a key and has mounted thereon a clutch Z which is interiorly slotted so as to be a sliding fit on the key. This shaft clutch engages with a clutch Z which is fixed to the outer end of the sleeve 2".

In order to vary the throw of the eccentric sheave, and, therefore, the travel of the pitman and with it the angular movement of the toggles, the screw Z which screwed into the shaft and normally keeps the two clutch-members in mutual engagement, is

run back so as to enable the clutch members to be disengaged from one another as shown The sleeve Z is then turned say day inserting a toinmy into one of the holes Z in the sleeve clutch, until the desired throw of the eccentric has been ob tained, the transverse slot above referred to permitting of the turning of the sleeve during this operation. The clutch-parts are now brought into mutual engagement again,

It will be understood that by means oi a slot such as d the angular movement of the toggles and, therefore, the travel of the can be brought down to any required minimum;

The angular movement of the toggles is capable of independent adjustment by raising or lowering the stroke adjusting block it by means of its screw 72 and hand-wheel L usual, The adjustment obtainable by means of the sheave Z combined with that obtainabl by means of the stroke adjusting i ii 1 gives r; very wide range. In some cases, however, the means for adjusting the block k may be dispensed with, the whole of the adjustment of the table-stroke being .then obtained by means otthe eccentric sheave. The clutchparts Z and Z are arranged exteriorly to the head motion so as to be readilv accessible and this without dismantling any part of the machine.

As a ready means of ascertaining the length of stroke of the table there is provided an indicator consisting of a slide rod n fixed to the bearing 5 and having slidably mounted thereon two stops nand a respectively. The stop a carries a plate- 21 provided wi h scale, The swivel-head is provided with a nib 9 Thus, when the table is reciprocating the stops are slidden along the rod until hey are just lightly touched by the nib and mark on the stop a is then read oil on the scale. The scale is so arranged that the reading indicates the length of stroke of the nib 5 and, therefore, that of the table.

Where two or more tables are being used. the indicator is particularly useful bee t affords a ready and quick method 0:? justing the strokes so that they either agree r differ by a predetermined amount, '.Ol111l necessary or desirable.

It will be obvious that the above-desc ed details of the machine may be modified without departing from the spirit of the invention,

By arranging the big end of the pitman low down, as shown in the drawings, the centre of gravity of the machine is lowered. This conduces to smoothness of running of the machine and is desirable in View of the high speed which a machine having the above-described improvements can be run The portions 6 and 79 of the base plate constitute an oil-bath in which the pitman and toggles and thrust-bar work.

The machine of this invention is capable of use also in treating slimes and mineral residues.

I claim ln ore concentrating and screening mechanism the combination with a reciprocatorv table and a thrust bar connected to and arranged in direct line with said table, of

driving shaft arranged below the thrustbar. an eccentric sheave provided with an interior slot about said shaft, a circuniferentiallv adjustable sleeve on said shaft and within said slot, said sleeve and sheave being provided with co-operating projections arranged so that such adjustment of said sleeve will correspondingly vary the throw of the eccentric sheave. a pitm an mounted on said eccentric sheave, a yoke fixed on sa d thrust-bar. toggles connecting said pitman with said yoke, a stroke adjusting block. and toggles connecting said pitman with said strokeadjusting block, and a spring acting on said. thrust-bar to return said table.

In testimony whereof, I have signed my name to this specification in the presence of a subscribing witness.

CHARLES JOHN WILLIAMS.

Witness:

H. T. P.

es 0 i

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