US2161999A - Filter tile - Google Patents

Description

June 1939- M. CHRISTIE ET AL 2,161,999

FILTER TILE Filed March 25, 1935 2 Sheets-Sheet 1 ATTORNEY.

June 13, 1939. I L.' M "CHRI STIE ET AL 2,161,999

FI'LTER TILE Filed March 25, 1935 2 S-heets-Shet 2 FIG 6 5FIG. 7'

INVENTORS.

BY mg ATTORNEY.

Patented June 13, 1939 UNITED STATES FILTER TILE Llewellyn M. Christie,

Edward F. Wanner, and

Arthur S. Brewer, Pittsburgh, Pa., assignors to National Fireproofing Corporation, Pittsburgh,

Pa., a corporation of Pennsylvania Application March 23, 1935, Serial No. 12,698

2 Claims.

This invention relates to new and useful improvements in filter blocks, and it is among the objects thereof to provide a tile structure having an integrally formed drain trough and supporting grid structure adapted for use With hollow spacer blocks to form a trickling filter bed,

The conventional trickling filter floor construction consists of trough blocks and grid blocks built up to form a drain and supporting structure for a bed of coarse material such as gravel, broken stones or the like, and in this form the supporting concrete bed on which the filter fioor is constructed usually forms a portion of the drain troughs.

In accordance with the present invention, the tile is constructed to have the drain troughs formed therein, thus facilitating the assembly of the tile or blocks and providing a smooth glazed surface for the passage of the sewage effluentto obtain a more or less self-cleaning effect, Such a structure is readily kept open by flushing, and there are no crevices or joints in which substances may accumulate and finally clog up the flow passage.

The nature and contruction of the invention will be more apparent from a description of the accompanying drawings constituting a part hereof in which like reference characters designate like parts and in which:

Figs. 1, 2 and 3 are a front and side elevation, and top plan view, respectively, of a preferred embodiment of the invention;

Fig. 4 a View in perspective of a fragmentary portion of spacer block;

Fig, 5 a view in perspective of the filter and spacer blocks of Figs. 1 to 4 when assembled;

Figs. 6, 7 and 8 are front and side elevations, and a plan view, respectively, of a modified form of filter block;

Fig. 9 a view in perspective of the blocks of Figs. 6 to 8 assembled with the spacer blocks of Fig. 4; and

Fig. 10 a view in perspective of a modified form of filter block.

Referring to Fig. 5 of the drawings, numeral l designates a concrete foundation which is of sloping construction for supporting filter blocks 2 and spacer blocks 3. The latter may be omitted and concrete poured in the space between adja 50 cent filter blocks. The blocks 2 are provided with drain troughs 4 in spaced relation and intervening spaces 5 to reduce the weight of the blocks. Blocks 2 have a plain face at the bottom and are recessed at 6 on the top a sufiicient distance 55 to cut away the neck-like recesses l at the top of the drain troughs 4 to form slots 8 in parallel relation which constitute the supporting grid for coarse filter materials such as stone, gravel, clinkers or the like.

This construction affords maximum fiow passage for the efiluent coupled with maximum strength of the solid vertical webs 9 and extreme lightness for handling and shipping. The spacer block 3 is likewise provided with hollow chambers ID to lighten the block and has a chamfered upper surface H for diverting the flow on each side towards the filter blocks, the bottom edge l2 of the chamfered faces being of substantially the same height as the recess 6 or slightly higher to cause drainage of the fluid to the recess 6, thence through slots 8 to the drain troughs 4. The spacer blocks 3 maintain proper alinement of the filter blocks and prevent their displacement.

In the construction shown in Figs, 6 to 9 inclusive, a plurality of large parallel drain troughs l3 are provided with heavy webs I4, the blocks being of elongated shape and provided with transverse parallel slots I5 forming the grid structure, the bottoms l6 of the slots being slightly below the upper wall I! of the troughs l3 to form slotted openings l8 for the passage of the eflluent through the top of the block to drain troughs I3. The drain trough has a curved bottom wall l9 to accelerate the flow of the drainage fluid. When assembled in the manner shown in Fig. 9, the grid slots l5 are transversely disposed relative to the flow troughs l3 while in the blocks of Figs. 1 to 5 inclusive the grid slots 8 are parallel with the fiow troughs 4. Spacer blocks 3 are employed between the filter blocks 2 in the same manner as in the structure of Fig. 5 although, as before stated, the filter blocks may be assembled as shown and concrete poured between the assembled rows.

In the construction shown in Fig. 10, a tile of the form of the spacer block 3 of Figures 4, 5 and 9 may be employed as a filter block by cutting transverse slots 2| across the sloping top as shown. Such a block is inexpensive to fabricate and by the employment of a central web '22 is strong in compression to withstand the weight of a filter bed. It is also apparent that any of the filter blocks with the slots may be assembled without spacer blocks or other intervening spacing materials,

It is evident from the foregoing description of the invention that filter tile or blocks made in accordance therewith and assembled with spacer tile furnish a large drainage surface and a strong supporting grid for the filter bed. The blocks are of structural form in'cross-section and provide 7 maximum strength" combined with minimum V the details of construction without departing weighta'nd the blocks 0! Figs. 1 to 5 are especially easy to manufacture as it merely requires the cuttingaway of the top recess after the blocks are" extruded from a die to form the grid w k. Y

7 Although several embodiments of the invention have been herein illustrated and described,

it is apparent that modifications may be made in from' the principles herein set forth,

sis

We claim: 7 a i 1. A trickling filter floor comprising rows'of hollow filter blocks in end to end relation each having a plurality of partition walls dividing the" hollow blocks into parallel drain" troughs extending longitudinally of the' blocks and rows to provide uninterrupted flow passages through successive blocks, the top of the blocks having horizontal walls provided with slots transversely of the drain troughs and extending below the top" wall of the partition walls to forma grid structure to support a filtering bed thereon.

2. A trickling filter floor comprising rows'of hollow filter bloeks in end-to-end relation, each block having a plurality of partition walls dividing their hollow interiors into paralleldrainjtroughs which are rounded at the bottom and horizontal at the top and extending longitudinally of the;

blocks and rows to provideuninterrupted flow passages through successive blocks, the top wall of the blocks being provided with slots extending transversely of the drain troughs and below the top'of the partitions walls to form a grid'structure 1 to support'a filtering bed thereon.

' LLEIWEILYN M. CHRISTI EDWARD F. WANNER. AR'I'HUR s, BREWER.- r

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