US2612996A - Ore jigger - Google Patents

Description

OCL 7, 1952 l. l.. PATTERSON 2,512,995

CRE JIGGER.

Filed sept. 19. 1949 Fin/7.5.

Patented Oct. 7, 1952 1 4 s. STATES PATENT i' can JIGda "Iaii ieslielattersoni Kuala iumper,

Selangor, Malaya.

` Application September 19, i949, :Serial No. II" In Great Britain Julyl 8, 1948 A a 4v claims. w1; tes-4,253 This `inventier1 encens iipfevemetshinor une arene side of the screed for mtement Vin relatingvr to `jigs used for the treatment ofj minthe planerof or parallel withthe screen; the striker gral ores; pin being operated by one arm of a double-armed of theweii-rwtypewhr finie' materiales '6 eus construction.. l i? Ofrl 5 "Grlidssse'd over a The screen is res'iliently supported forlshock SC eh :isivrhriaftef referred movement, as in a mounting or mountingsvof and is subjected to e iqmsatir'igupf rubber; Y, Y s; vement thereover'by` water currents l Two constructions in accordance Vwith the prs; "sfo l 'a statication ofthe material 10 ent-invention will nowibe 'described by Way of me' passage' ofv the `ore particles through the example withv reference to the accompanying screen to hiitch inthe jig. 'Iliwatercurrents drawings in which:u i y y o A Figure 1 is a diagrammatic cross'sectioniof one type of j iginwhichqwater currents' are impelled byarec'iprocet-toryplunger;andyl M '1; Fig11`r.2 zs a @95S section or anotherityuel of jig-in whichH waterdcurrents are impelledby -a mirzrc.euery;eiephraeln-4 i M Igikereferencs are used for similar partsv in the two figures.` ,l y v .y Y.

v ,iRe'ferring iirst to theyconstructionjshownz in Ijigu'eul, the jg'is pro "dedlwith'aushell, or box '-9 ,ditemi en@ Side plunger H mounted ff?? Yeriial reiprocawrymeramente The plunger is Ichou1c1-ed byamconnecting rod lZZto driving e tric i331. mounted on a horizontalvlshaft i4. ,denother side or the" jig, `afscreen l5 isvitted @12 ierfndbetiem grids! &.|1-, y. i

' d `grid assemblyw` `mountedloe-- ed .leiter rubber pads y. l 81S@ Athat torete clean me sc're Ina" al clanin applied duv screens begin toibii m ing, and thisV lili` b worse, so that 'capacity i'sreducd. V y N "ccdiidiiflg t'i the'-i 15' 's'en't fitiiyin ijf""""f 30 thel above type-there isfp'iovided impact mechf' anism for automatically iriinzi-ritirigi'`during func'- tion'ine'ofltie jig an intermittent or a continuous series of shock movements to the jig screen so as to obviate or reduce' blinding-'of the screen.

i The' impact mechanism may include the combination of a stepped rotary driving cam' which; is rotated continuously, a rocking lever operated y .A L i equally nonby the cam; and ahermer device operated byl zromaily and' Vis'-miminier fqf'mkm'g lmovemgnt the Cam for imparting the' shock movements `to 40 about a pivot 23.` `flre other armi'of tHe lever the screen The shock` movements maybe"i imisgpositioned uiiuda rotarystepillen' o progressively of th jig below the screen in a direction normal to the tinuous hammer blows on the top grid I6. This plane of the screen, the hammer being operatively 50 operation produces an oscillatory up-and-down coupled by a connecting rod to one arm of a movement of the screen within its resilient double-armed rocking lever, whose other arm is mounting I8. Shocks imparted to the screen at operated by the cam. a plunger speed of 120 strokes a minute have With another construction the hammer device proved satisfactory.

comprises a striker pin slidably mounted in a 55 Referring now to Figure 2 a pulsating iiow of me jig te whie'ntiie ivenueri'is apiaiid is .lever in @manner similar to that muitileprevi- Water is impelled through the screen I5 by a diaphragm mounted for reciprocatory movement on a horizontal shaft 26 within one of the several cells of the jig shell l0. At one side of the jig shell is a rotary stepped cam 24 fitted on a horizontal shaft 21. This cam lies adjacent the tip of the shorter arm of a double-armed rocking lever 22l carried by a pivot 2,3. A tension spring 28 connects lthe end ofthe other lever arm to a Xed bracket' 29 in such manner as to hold'the shorter arm resiliently in contact with the cam periphery. In line with the path of movement of the upper lever arm is a striker pin 3U slidablyy fitted in a guide 3| at the side of the shell. At its inner end the striker pin is positioned to engage'v the side of the lower screen grid I1.

The screen-and-grid assemblyissupportedon brackets 32.

Ihere is a resilient packing 33 bef tween the assembly and the walls of the shell for` permitting a resilient oscillatory movement' ofI the screen within its own plane.

Onrocking of the lever, the upper arm imparts blows on the outer end of the striker pin, which in turn imparts hammer `blowsto the side of the `screen-and-grid assembly.` As a consequence,

this assembly is given oscillatory shock movements in itsown plane .during operation of the Among the advantages of the invention are: blinding of the screen apertures is reduced or obviated; cleaningof the screenis effected automatically during operation ofthe jig, so that the eilicienty of the jig remains unimpaired throughout its operation; a saving of time, since the jigs do not require to beV taken out of service for cleaning, because cleaning is effected automatically during operationof the jig, savingv of manual labour; avoidance of the necessity for skilled supervision of manual cleaning, and the prolonging of the life of the screen plates,because they do not require to be threshed y The rigid grid members I6 and I1 together with theV screen constitute 4 a frame or unit 'mounted for bodily movement with respectto the support in the shelll.l In other words the frame or unit as a whole is capable of a vmotion of translation relatively to the shelf 'orfsupport The frame or unit is driven in one direction bythehammer blows and by reasongof the fact that the frame or unit is cradled in resilient packing or the like the original movement set up by the blows results in a vibratory motion of the unit incident to the alternate compression and expansion of the packing at opposite sides or ends of the'unit. Thus two forcesI act on the unit and due to its unitary character and its cradling in rubber the screen is vibrated as a whole with Vall areas of the screen partaking equally of the vibratory -motion in contradistinction to vibratory movement locally impressed on a screen that is 'so anchored Yas not to be capable of a floating vibratory motion of translation.

This uniform movement of the grid-and-screen unit throughout substantially its entire area vwill not only prevent clogging of the screen but will also impart to the material being treated a uniform movement throughout the entire mass or body of the material. Such action on thevpart of the unit will not interfere with the proper `:under.water arid is subjected by water-.currents to pulsating up-and-down movements to elfect stratification of the ore, the provision of a stationary shell, a screen, upper and lower grid members between which the screen is rigidly lclamped in a horizontal position within the shell,

upper and lower resilient rubber pads carried by the shell between which the screen-and-grid assembly is mounted for` oscillatory up-and-down movement as a unit in the shell, and a hammer guided -.for vertical movement centrally of the screen for imparting blows direct to the grid members to producevertical oscillatory Ashock 'movements to the screen-and-grid, assembly.

2.V Ina jig, a unit comprising a screenand grid members rigidly secured together, a support von which said unithasl bodily movement of translation, a resilient cushion on said support and'positioned at one side of said unit, a second resilient cushion on said supportand positioned'atthe opposite side of said unit, and' hammer means to impart blows to said unit to drive it bodily in one direction against the first resilient cushion, whereby the first cushion will be distorted rand will react to drive the unit bodilyagainst the secondresilient cushion so that said second cushion will be distorted and will react to drive the unit bodily back against the rst cushion toset up in the unit a vibrating motion throughout substantially its entire area. ,I l

3. In a jig, a unit comprising a screen and grid members rigidly secured together, asupport on which said unit has bodily movement of translation, resilient means comprisingportionsl positioned at opposite sides of said unit, and means to impart blows to said unit to drive it bodily in one direction against one of said portions, each of said portions adapted to be distorted by the impact of said unit thereagainst and to react to oscillate said unit between said portions and to effectshock movements of said unit.

4. Apparatus as claimed in claim 3, wherein the hammer is mounted to direct blows to the side of the frame in adirection substantially within the plane of the screen. i

. IAN LESLIE PATTERSON.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS 2,027,375 Fraser Jan. 14, 1936

Images