Show T THE H sturtevant tox TOGGLE GLE SEPARATOR contributed shaking screens although comparatively ively new have because of their extraordinary capacity nearly displaced all other devices within their field of usefulness it would atwould be untrue to say that durability has not also been an important factor in their adoption inclining a screen has much the same practical effect as reducing the size of its meshes and therefore a comparatively coarse wire on a steeply pitched screen may be used for fine separations this explains their lasting qualities for that heavy wire clothing is more durable than delicate constructions is obvious inclined separators are also cheap because they are ready to run as soon as a belt is attached without any boxing hop or setting bettina up expenses all these good points have become known and are appreciated the sturtevant mill company of boston mass has made m ade special studies studies of screen construction and has effected important improvements prove ments in inclined screens their separators have four screens forty eight square feet in all placed and firmly held one over another in a strong box two feet wide and six feet long each screen is a substantial construction and easily handled for it is small each receives equal feed evenly spread over the wire surfaces eg one outlet discharges the tailings another the taj fines no conveyors are used to carry in or out or to spread material they are not needed gravity does it all it has been found to be practically impossible to spread any substance evenly over a large laege screen wide separators are weak affairs they take diw 0 V botial otial olp az oil T ahe che adf tole repa A 0 atif aur r 4 Ino nother lher vieta vf eto of q the ae 1 separator epa up four times the room of sturtevant constructions in these the screen box is supported on springs and shaken by a toa toggle agle ane toggle has no lifting to do it has only to shake and this it does four times for each revolution of the driving pulley which does not have to run fast and moves so easily that the power required is but a small fraction of that used by any other screen of large capacity the toggle is an ideal vibrator for screens and besides being simple is scarcely harmed at all by grit toggles have the same durability in screens as in the roll jaw fine crushers made by the sturtevant mill company the improvements described have reduced inclined separators to one fourth their former size and have given strength and durability to the only weak points of a most valuable invention by set setting settina tint the toggle so as to vibrate the box and its screens vertically another advance sec securing u ring a further increase in the well known capacity of inclined separators has been attained it was noticed that an inclined screen vertically shaken throws the material upon it upward in ve vertical lines this could then obviously only fall back to the point from which it started thus no material could pass over the screen while in the air it could only slide down while on the wire thorough Tho gere screening ening was seen tobe to be thus accomplished accomplish edl t all the surface being used in no inclined shaking screens except the sturtevant are the particles thrown vertically they are always projected in a fora forward rard direction and dropped vertically from the point where the upward movement ceases to a point on the screen considerably below where they started tar ted thus the material in all common screens passes down while in the air by leaps and bounds and skips much of the screening surface vertical v vibration b ration requires no theory to explain its practical advantages improves it proves itself in very considerably increased outputs sturtevant tom toggle e separators are good because they belong to a class of good things but they are the best because they alone have perfectly efficient scree screening nino surfaces and doing more work last longer and only occupy one fourth the space of other machines all inclined vibratory separators may be clothed with perforations varying maryin 0 anywhere from one half inch to mesh as ordered |