US 744761 A
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; No. 744,761. vPATENTED Nov. 24, 1903.
A. JAMES. EILTER PRESS.
y APPLICATION IILBDAPB. 3, 1903. l N0 MODEL. Y '2 SHBETS-SH'EET 1.
rif/7155555 l [wml/razz;
- No. 744,761. PATENTEE Nov.- 24, 1903.
APPLICATION FILED APB. 3, 1903.
2 SHEETS-SHEET 2.
No MODEL. v
UNITED STATES Iatented November 24, 193`.
vALFRED JAMES, `Oli-LONDON, ENGLAND.
SPECIFICATION forming part of Letters Patent No. 744,761, dated November 24, 1903.
n Application filed April 3, 1903'. Serial No. 150.927. (No model.)
To a/ whom-it may oon/cern:
Beit known that I, ALFRED JAMES, a subject of the King of Great Britain, residing at 56 New Broad street, in the city of London, England, have invented anew and useful Improved Filter-Press, of which the following is a specification. l
My' invention relates to the useof filterpresses for separating solid matter from solutions in which the former may be Contained and also to the washing out from the cakes ot' such solid matter in the press the solution remaining as moisture therein and replacing ysame by fresh water or other liquid or air.'
In the present method of using such filterpresses where these are provided with washing apparatus either a largenumber of cocks is provided, at least half'of which require to be shut off at each operation andwliich are, moreover, liable to get out of order and to cause endless worry, or holes are made inside the presses for the conveyance of solids and liquids, which render necessary the cutting of the cloths and cause considerable wear and tear of these, in addition tothe trouble of tittin g on the cloths at each'operation. An attempt has also been made to use filterpresses With ports outside the cloths; but in this case instead of the wash solutions-being conveyed diagonally through the cakes, thus causing perfect extraction, their shortest direction is across the cake, thus washing aportion of this only; or if the ports are placed at the bottom these project and are inconvenient, as the plates containing the cakes cannot be lifted out of the press without considerable twisting, which is not only inconvenient and expensive, but is liable to cause the loss of the cake. To overcome these objections, I provide special plates, as illustrated ou the accompanying drawings, Figure 1 being a front elevation of a filteringplate and Fig. 2 of a washing-plate. Fig. 3 is a front elevation of one of the frames; Fig. 4, a vertical section of the press on the line A A, Fig. 3, through the ports through which the pulp and washing-water, respectively, enter the press; and Fig. 5 is a vertical section, partly on line B B, Fig. 3.
a is the feed-port, provided on each plate e f and'frame g, but having connection to the frame g only. Through this the pulp -is forced and is retained in the frame bythe protection of a lter-clothj or other pervious material hung over' the frame or plate. The
plate e fsupports the cloth butallows the A,
solution to permeate this and conducts it along the channels, in the case of the filtering-platee to the channel d and in the case ot' the washing-platefto the channel c. The channel d is separate-and on the filteringplates e only. The channel c is continuous on all plates and frames and has a connection to the interior ot' the washing-plate f only.
, ln Working this press the end frame h thereof is made similar to vone side of the plate e, (shown in Fig. 1)-that is, a low-pressure or filtering plate with the ever open outlet d. Next this is put a frame g and after this a high-pressure or washin g plate f, then another frame g, and then a low-pressure or filtering plate e, and so on, as shown in Figs. L,tand 5.
The pulp to be filtered enters eachframe g at port a andthesolid matter ills this frame, forming a cake therein, and the solution escapes through the filter-cloth or other medium fitted on the plates e and f. The solution iiltered through on the high-pressure or washing plates f escapes by the continuous channel c. The filtrate from the low-pressure or filtering plates e escapes by the separate'outlets d. When the press is full, the pulp is turned off at port agby means of a cock (indicated diagrammatieally at k) and the wash- -ing liquid is fed through port b, which is controlled by the cock indicated diagrammatically at Z. So soon as the liquid commences toji'low through channel c, thus indicating all the air has been expelled from the ribs of the plates c f, a valve (indicateddiagrammatically atm) at theend of this channel isclosed,
so that the high-pressure or washing plates f f can no longer be used as filtering-channels,
but only as the entrance-channels, for the distribution of the washing-Water, whereby the solution is forced from the ribs of the washing-plate f in a double diagonal direction through the cake of lter-pressed matter, the displaced moisture of which is expelled through channel d, which always remains open. It will thus be noticed that the path of least resistance is from the rear left-hand top'corner of one plate to the front right-hand IOO bottom corner of the other plate, which is the longest distance to be traveled through the cake, and it thus insures perfect washing of all its portions. The cocks and valves above referred may be of any Well-known construction, and consequently do not require specific illustration, but are si mplyindicated diagrammatically at the positions they occupy. If desired, compressed air may now be blown through the cakes in a similar manner or through port a, and this will be found to eX- pel a considerable portion of the moisture remaining from the Wash. The joints of the ports are made by recessed rubber rings n, which automatically close perfectly tight on the shutting up of the press.
In order to provide for the easy Withdrawal of the frames with their contents from the press, so as in no Way to disturb the pressed cakes, I provide the port CZ in such a position as in no Way to project sidewise beneath the side bars '15 of the press, and yet also to in no way interfere with the hanging of the cloths or the efficient closing of the bottom of the press by forming this of a taper-shaped projection in the position shown, having no connection with any similar outlets on similar plates. The frames can thus be taken out of the press by a direct vertical movement, no twisting, shaking, or bending being necessary.
I wish it to be understood that I do not claim the use of continuous ports closed with one valve or separate ports for the flow of expressed original solution and of subsequent washings or of the combination of continuous passages for the admission of the original liquid and of Washing liquid While the outlet-orifice is provided on that side of the elements which is opposite to the lter-ports; but what I seek to protect is the precise combination of ports and channels, &c., shown in the accompanying illustrations, in which there are no internal ports or channels requiring holes or other special preparation or titting of t-he filter-cloths and in which there are no separate cocks to either the iiltrate or Washing outlets and in which, moreover, the most direct line of transit of Washing solution is as shown and in Which the tiltrateoutlet is so placed as not to interfere with the convenient withdrawing of the frames and plates, all as shown.
Vhat I claim as my invention, and desire to secure by Letters Patent, is-
In a Washing filter-press, a series of alternating filtering-plates,frame-plates and washing-plates, with suitable ltering-cloths, having continuous passages at top on one side in said plates for the admission of the liquid to be filtered and the Washing liquid respectively, the first-named passage communicating with the frame-plate cavities only, the last-named passage communicating with the Washing-plates only, a continuous ehuX-passage at top on the opposite side com municating with the Washing-plates only, and outletorices on the filtering-plates at bottom,diago nally opposite to the filter ports or passages, substantially as and for the purpose specified.
In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.
W. J.'TERRY, JOSEPH LAKE.