US1327537A

US1327537A - Jig

Info

Publication number: US1327537A
Application number: US158015A
Authority: US
Inventors: Guy H Elmore
Original assignee: Individual
Current assignee: Individual
Priority date: 1917-03-28
Filing date: 1917-03-28
Publication date: 1920-01-06
Anticipated expiration: 1937-01-06

Description

G. H. ELMORE.

ms. APPLlCATION FILED MAR.28,19H.

Patented Jan. 6,1920.

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us. APPLICATION FILED MAR. I 7- '1,327',53.'7. Patented Jan. 6,1920.

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.G. H. ELMORE.

Jl-G. APPLICATION men MAR. 2a, 1911.

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lfl l 5 2! W. P H ML??? gwuvntoc GUY H. ELMORE, OF SWARTHMORE, PENNSYLVANIA.

J IG.

Specification of Letters latent.

Patented Jan. 6, 1920.

Application filed March 28, 1917. Serial No. 158,015.

To all whom it may concern.-

Be it known that I, GUY H. ELMORE, a citizen of the United States, residing at fiwarthmore, in the county of Delaware and State of Pennsylvania, have invented certain new and useful Improvements in Jigs, of which the following is.a specification.

This invention relates to jigs and particularly to the construction of the screens thereof.

The prime object of the invention is to equalize the water flow or pulsation in jigs having large screens, or in jigs having vertically offset screens so that the jigging action will be effective over the entire screen, regardless of the distance from the plunger and regardless of differences in the depth of the bed. i

In the accompanying drawings, which illustrate the preferred modes of embodying the invention Figure 1 is a vertical section of a complete 1 Fig. 2 is an enlarged portion of Fig.1 showing the screen and deflector structure;

Fig. 3 is a section on the line 3-3 of Fig. 2;

Fig. 4 is a perspective view of a support for the screen and deflectors;

Fig. 5 is a section across a slightly modified form of deflector,'with the screen removed; and

Fig. 6 is a fragmentary section through the hutch of a single screen jig, showing a simple embodiment of the invention readily applicable to existing jigs.

Referring particularly to Figs. 1 to 4, the jig tank is indicated generally by the numeral 11. This is divided at its top by a partition 12 into a plunger box 13, and a screen box 14 which communicate below partition 12 by means of the hutch 15. The hutch 15 is formed with sloping sides 16, 17 to assist the pulsing flow between the plunger box and the screen box.

A plunger 18 operates in the box 13 and is reciprocated by an eccentric 19 whose shaft 20 is mounted in bearings (not shown) on the jig tank, and is driven by any suitable means such as a chain 21 from a sprocket wheel 22. The details of construction of the plunger are not material to the present invention as any of the various familiar types of plunger may be used.

The important features of novelty reside in the arrangement and 'mounting of the screen, hereinafter mentioned.

screen and deflectors. Attached to the sides of the jig tank are carriers 23. The left ends of the carriers 23 (as viewed in Fig. 1) 2'. c. the ends nearest partition 12, are spaced from this partition a few inches, while the right ends are spaced from the discharge end of the jig tank a distance approximately equal to the length of the second or lower The left ends of carriers 23 have lugs 24 to carry a transverse bearer bar 25. This has a depending tapering web 26, a forward bearer flange 27 for the first or higher screen, and an upstanding plate 28 provided with large apertures 29. The upper edge of plate 28 has a flange 30 which supports an inclined partition 31 bridging the space to partition 12.

The right ends of carriers 23 have lugs 32 which carry a" second transverse bearer bar 33 provided with a top flange 34 and a side flange 35. A cast iron grid or grate 36 extends across the screen chamber and is supported on

flanges

27 and 34 of the two bearer bars, the two bars being so dimensioned that the screen is slightly inclined downward toward the discharge, as shown.

Atthe right or discharge end of the screen box is a casting 37 having a bearing flange 38 and a cylindrical sealing face 39 to coact with the discharge power driven vaned valve or discharge roll 40. A second screen 41, lower than screen 36 and more inclined toward the'discharge, is carried by the

flanges

35 and 38.

The carriers 23 are provided with a munber of lugs 42 of the angular flange construction shown. Three such lugs are shown in the drawing on eachcarrier but the number is a matter of design. Carried at their ends by the lugs 42 are the deflector bars 43, commonly of wood, each bar being triangular in cross section so as to have two rather steeply inclined top faces which will not arrest and support material falling through the screen 36'. The purpose of these bars 43 is to choke or'deaden the, water pulsations through screen 36, which is nearer plunger 18, and consequently intensify the pulsations through screen 41 which normally are choked by the greater depth of the bed on this screen and the relative remoteness from plunger 18. The action of the bars 43 may be varied by cutting away the lower edges thereof as shown at 44 in Fig. 5. Wood is a desirable'material for these bars because of the ease with which it may be worked to give this adjustment. Metal bars may however be used and would then be supplied in various standard dimensions.

The feed to screen 36 is led in behind a sloping partition forming a sort of feed box 4.6. .The discharge of heavier material (slate in the case of coal; concentrates in the case of metallic ores) takes place at the lower end of screen e1. It is controlled by a slide gate 47 depending from the overflow dam 48 and manually adjustable by handle 9, for which, however, any usual or known automatic adjusting device may be substituted.

The heavier material passing out under gate 47 is discharged by the vaned roll or valve 40, which extends the full width of the screen, into the boot 50 of a drag conveyer 51. The conveyer 51 is narrow and located at the middle of the end of the The boot is therefore made with inwardly sloping sides at 52 and a deflector. 53 is placed over the upper or descending run of the conveyer chain.

The lighter material (washed coal, or in the case of ore, tailings) flows over dam 4-8, and down a dewatering screen 5a which extends the full width of the ji and hence branches around the side walfs 55 of the casing of the discharge conveyer 51. The construction and arrangement of the conveyer 51 is not a part of the present invention and is described here only to aid in an understanding of the complete operation of the device.

A hutch valve 56 is provided and may be operated by the lever 5 When the jig is in operation the tank is continuously supplied with water, the plunger 18 is reciprocated and the valve 1-0 and conveyer 51 are driven at proper speeds. The water pulsations caused by plunger 18, acting upward through the screens 36 and l1 exert the familiar jigging action on material fed to box 46 and thence flowing across the screens toward the discharges. The deflectors 43 exert a desirable equaliz-- ing action on the jigging eifect of the various screens. The water pulses also act on the material at the head of the screen 36 in a horizontal direction, flowing up between bearer bar 25 and partition 12 and thence horizontally through apertures 29 above screen 36. This assists the feeding action and gives a coarse initial classification.

Jigs having offset screens with a deeper bed at discharge are desirable because a closer separation can be had in a deep bed. Their size has, however been limited by the unequal jigging action caused by the differing depths of the beds on the two screens, a defect which is exaggerated by their differ ent distances from the plunger. The application of the deflectors above described removes or reduces this difficulty and thus presents special advantages in combination with this type of jig.

The invention is however applicable to continuous screen jigs, for example, in the manner illustrated in Fig. 6. Here 58 is the jig tank, 59 the plunger chamber, (the plunger being omitted from the drawing) 60 the hutch and 61 the screen. Any discharge mechanism for the heavier materials passing from the screen over barrier 62 would be used. The lighter materials over flow at 63.

Mounted beneath the screen, and extending part way from the plunger side of the screen to the opposite side (not the discharge side in this'case) are bearer bars 6 L on which rest a number of triangular defiector bars 65, six being shown. Their function is to equalize the pulsations on the screen in a manner already described.

Various other minor variations in structure are possible, are contemplated, and fall within the scope of the invention.

The deflector. structure here shown and described is to be clearly distinguished from mere screen supports such as thin bars, rods, or the like, designed to prevent sagging of the screen. To operate efiiciently these deflectors should interpose between the upwardly moving-water and the bottom of the screen, a quite extended area, advisably m'aterial'ly greater than the area of the spaces between the bars constituting such structure.-

So, too, it is desirable that the deflector bars be spaced some distance away from the ruder side of the screen'so to permit a diffusion of the water, or a substantially even distribution of it over the entire area of the screen. Finally, the bars should be of such form as to offer little or no obstacleto the free descent of the matters pa "sing through the meshes of the screen. T aking into account the several considerations noted, the triangular form of bar, or theprovision of oblique top surfaces converging at the upper side of the bar and diverging toward the lower side thereof, is found peculiarly advantageous.

Having thus described my invention,what I claim is 1. Ina jig, the combination of a tank; a screen in said tank; means for producing water pulsationsthrough said screen; means for feeding materials to be separated, to said screen; means for separately discharging the separated materials from said screen; and a deflector structure comprising a plurality of separated fixed deflector bars mount-ed beneath and substantially parallel with that portion of the screen adjacent said pulsation-producing means, for locally checking such pulsations, the deflector bars being transverse to the direction of flow of water and of material. on the screen.

lli

2. In a jig, the combination of a tank; a screen in said tank; means for producing water pulsations through said screen; means for feeding materials to be separated, to said screen; means for separately discharging the separated materials from said screen; and a plurality of fixed, transverse deflector bars having steeply inclined top surfaces mounted beneath that portion of the screen adjacent said ulsation producing means for locally checking such pulsations.

3. In a jig, the combination of a tank; a pair of adjacent and vertically offset screens in said tank; means common to both screens for producing water pulsations through said screens; means for feeding materials to be separated, to the higher of said screens; means for discharging the separated materials after passing over the lower of said screens; and a deflector structure comprisin a series of separated, fixed, transverse ars arranged beneath and substantially parallel with the higher of said screens, adapted to intensify the pulsations on the lower screen by choking the action upon the upper screen.

4:. In a jig, the combination of a tank; a pair of adjacent and vertically offset screens in said tank; means common to both screens for producing water pulsations through said screens; means for feeding materials to be separated, to the higher of said screens; means for discharging the sepa rated materials after passing over the lower of said screens; and a plurality of fixed, transverse deflector bars having steeply inclined top surfaces mounted beneath the higher of said screens, adapted to intensifythe pulsations on the lower screen by choking the action upon the upper screen.

5. In a jig, the combination of a tank; a pair of adjacent and vertically offset screens in said tank; a plunger, operative in said tank adjacent the higher of said screens to produce water pulsations through said screens; means for feeding materials to be separated, to the higher of said screens; means for separately discharging the separated materials after passing over the lower of said screens; and a deflector structure comprising a series of separated, fixed, transverse deflector bars arranged beneath and substantially parallel with the higher of said screens.

6. In a jig, the combination of a tank; a pair of adjacent and vertically offset screens in said tank; a plunger, operative in said tank adjacent the higher of said screens to produce water pulsations through said screens; means for feeding materials to be separated, to the higher of said screens; means for separately discharging the separated materials after passing over the lower of said screens; and a plurality of rigid, transverse deflector bars having steeply inclined top surfaces, mounted beneath the hi her of said screens.

In a jig, the combination of a tank; a pair of adjacent and vertically ofiset screens in said tank; means for producing water pulsations through said screens; means for feeding materials to be separated, to the higher of said screens; means for discharging the separated materials after passing over the lower of said screens; a deflector structure mounted beneath the higher of said screens and comprising a series of fixed transverse bars; and a guide passage serving to direct a portion of the pulsing water to a point above that edge of the higher screen at the point of feed of material thereto during the upward flow of water through the screen.

8. In a jig, the combination of a tank; a pair of adjacent and vertically offset screens in said tank; means for producing water,

pulsations through said screens; means for feeding materials to be separated, to the higher of said screens; means for discharging the separated materials after passing over the lower of said screens; a plurality of fixed deflector bars having steeply inclined top surfaces mounted beneath the higher of said screens; and a guide passage serving to direct a portion of the pulsing water to a point above that edge of the higher screen at the point of feed of material thereto, during the upward flow of water through the screen. p

9. In a jig, the combination of a hutch; means for producing water pulsations in said hutch; a screen extending across said hutch in the path of the pulsing water, but spaced at its head away from the walls of the hutch to permit flow of the pulsing water to and over the head of the screen during upward flow of water through the same; and means for feeding material to be treated adjacent the head of said screen.

10. In a jig, the combination of a hutch; means for producing water pulsations in said hutch; a screen extending across said hutch in the path of the pulsing water, but spaced at its head away from the walls of the hutch to permit flow of the pulsing water to and over the head of the screen simultaneously with its upward flow through the screen; means for feeding material to be treaded adjacent the head of said screen; and a transverse deflector structure mounted beneath said screen and adapted to equalize the pulsing flow of water therethrough.

In testimony whereof I have signed my name to this specification.

GUY H. ELMORE.