US3817864A - Sanitary drainage system - Google Patents

Abstract

A novel and improved sanitary drainage system is provided wherein the septic tank of the system is fabricated from Fiberglas which has advantages over the use of pre-cast concrete or other material heretofore used in that it is non-corrosive, impervious and light and strong with some flexibility. The Fiberglas septic tank has a generally hemi-spherical, furstoconical or polygonal shape.

Description

Juile 18, 1974 B, ARLSON ETAL 3,817,864

SANITARY DRAINAGE SYSTEM Filed June 2, 1972 United States Patent Office PM... J... .8, 197.

3,817,864 1 SANITARY DRAINAGE SYSI'EM Henry B. Carlson, Kings Park, and John R. Pinezich, Northport, N.Y., assignors to Andrew Carlson 8: Sons, Inc., Kings Park, NY;

. Filed June 2, 1972, Ser. No. 259,277

Int. Cl. Bold 21/10 US. Cl. 210-170 Claims ABSTRACT OF THE DISCLOSURE BACKGROUND OF THE INVENTION In co-pending application Ser. No. 240,138 filed Mar. 31, 1972 a novel septic tank construction has been described which, however, while not limited to the use of precast concrete is preferably made of that material and has a generally toroidal or other shape which may be varied in accordance with requirements of fabrication and installation. The contents of said copending application are hereby made a part hereof.

THE PRESENT INVENTION According to the present invention it has been discovered that by making the septic tank of the sanitary drainage system of Fiberglas and with a generally hemispherical, frusto-conical or polygonal shape important and unexpected advantages accrue. The entire installation is furthermore simplified with respect to its fabrication, assembly and installation.

In the accompanying drawing,

FIG. 1 is a vertical medial section taken through the new sanitary drainage system; and

FIG. 2 is essentially a top plan view of FIG. 1 with certain upper parts removed or broken away to show the underlying construction.

Referring to the drawing, numeral 10 represents the leaching pool which is made up essentially of a series of super-imposed pre-cast concrete drain rings 12 which are of generally trapezoidal cross-section and which thereby provide exit spaces 13 for eflluent which seeps into the surrounding earth, it being understood that normally the entire installation is underground below ground level 11 and its location is readily ascertainable by the marker M. It is understood, however, that while pre-cast concrete drain rings are illustrated, the invention is not limited thereto since other materials can be substituted.

The uppermost ring 14 constitutes the top of the leaching pool proper, it being understood that while the leaching pool is usually round (or circular, it can be rectangular or polygonal if desired, and resting thereon is a dome 15 which like the rings 12 and 14 is made of pre-cast concrete or other suitable material and terminates at its upper end in an opening 16 which is closed by a removable slab or cover 17 also made of precast concrete or other suitable material. It will be seen that the dome 15 is of a generally frustoconical crosssection when viewed vertically and is of course round when the leaching pool wall is round or of other shape when the leaching pool wall is non-circular. An inlet pipe 18 extends through the dome 15 as illustrated and discharges sewage or other waste material into the Fiberglas septic tank designated by the numeral 19 above the liquid level L therein and on one side of baflle plate 20 which is provided with bafiie openings 21' for purposes of circulation similar to the like openings 25 in FIG. 1 of the aforesaid co-pending application. The path of circulation is shown by the directional flow arrows in FIG. 2.

A particularly important and novel feature of the present invention resides in the septic tank 19 and its fabrication from Fiberglas. Fiberglas is a known material which is widely available commercially and which has a variety of uses and it is understood that the Fiberglas of the septic tank is made of the standard known and available material. It is, however, necessary to fabricate the Fiberglas septic tank 19 from a plurality of segments in order to give it the particular shape illustrated or other shape wherein the lower portion of the tank 19 is generally hemi-spherical or has a somewhat flattened polygonal shape depending on the specific nature of the individual segments and is of a modified toroidal shape in that it surrounds the access shaft 21 which serves as downflow for sewage or other waste material leading from the interior of the septic tank to the leaching pool. The access shaft 21 is of generally tubular or circular nature, but is not restricted to such shape and it is provided with a removable inner cover 22 or a cover which is fastened, which is hinged or secured for opening in the manner of a garbage can cover of Fiberglas, sheet plastic or other non-corrosive material. In addition it will be observed that access shaft 21 is in vertical alignment with dome opening 16 so that when slab 17 is removed, there is ready access to inner cover 22 and (upon removal or pivotal movement thereof) to the interior of access shaft 21 for observation or cleaning or other usual purpose. It will still further be observed that access shaft 21 has an opening 23 in its wall 24 whereby the material in tank 19 is permitted or caused to move upwardly in the short vertical tubular member 25 from which it exits as shown by arrow at 26 and flows downwardly through the access shaft 21 into the leaching pool 10 whereupon the treated sewage or other waste material passes out through efliuent openings 13 into the surrounding earth.

The Fiberglas tank 19 can be fabricated in any suitable or known manner as by casting or molding operations or by forming sections which are thereafter bolted or otherwise secured together in a water-tight fashion. The material is light, strong and advantageously somewhat flexible while being non-corrosive and superior to pre-cast concrete or other materials heretofore employed in the manufacture of septic tanks. It will also be appreciated, as stated in the aforesaid co-pending application, that the leaching pool and the septic tank may be made of various sizes and capacities which are in general governed by local ordinance or regulation. The septic tank may be held easily within the leaching pool in the position shown in FIG. 1 in any desired manner such as by means of the lateral tab or extension 27 held between uppermost ring 14 and the lowermost surface of dome 15 and as will be further observed the Fiberglas baffle plate 20 which extends upward along the inner dome surface is constructed with a flexible flange 28 which serves as a gasket between the baffle plate and the dome.

It is to be understood that the invention includes septic tanks of various shapes, as referred to above, andthat instead of the curved septic tank wall shown in FIG. 1 a straight wall can also be employed wherein the tank is in effect frusto-conical with the wall extending in a direct substantially straight line from member 27 to the bottom of access shaft 21. In actuality, due to fabrication methods, the shape of the tank 19 is polygonal because of the assembly of a plurality of straight cast or molded sections. In addition, inlet pipe 18 can be located on the opposite side of baffle plate 20 from that shown in FIG. 2 in which case the flow directions are reversed as compared to the directional arrows of FIG. 2. In either event, the flow via 26 is controllable by a plug insertable into and removable from each half of opening 26 so that in the arrangement shown in FIG. 2 fiow proceeds via 26 on the nearer side of bafile 20 and when inlet pipe 18 is in its alternative position opposite flow occurs. Secondary discharge may be arranged from a pipe leading to another unit or location where conditions such as volume and rate of flow require.

It has been found that sanitary drainage systems according to the present invention are easily and rapidly manufactured, transported and installed and meet all local laws and regulations.

What is claimed is:

1. A sanitary drainage system comprising a leaching pool defined by a circular or polygonal wall having efiluent openings therethrough, a dome atop said 'wall and having an opening in its upper portion, a closure over said opening, a Fiberglas septic tank having its wall extending upwardly and inwardly along the dome inner surface and part way down into said leaching pool and supported from the upper edge of said wall being held between the leaching pool wall top and the dome bottom and converging therefrom downwardly and inwardly toward the center of the pool interior leaving a space between the septic tank and the leaching pool wall and configured to provide a hollow access shaft in vertical registry with the dome opening, an inner cover on the upper end of the access shaft, inlet means passing through said dome at the upper end of the tank wall and outlet means in said tank at the upper end of the pool wall communicating with the interior of the access shaft for directing sewage into said pool.

2. A sanitary drainage system according to claim 1, wherein the septic tank is generally hemi-spherical in ver tical medial section.

3. A sanitary drainage system according to claim 1, wherein the septic tank is of somewhat flattened polygonal shape in vertical medial section.

4. A sanitary drainage system according to claim 1, wherein the septic tank is provided with an aperturcd, diametrically disposed bafile plate terminating below the dome top at the level of the inlet means and providing a space between the bafiie and the top of the dome.

5. A sanitary drainage system according to claim 1, wherein the leaching, pool wall has efliuent openings throughout its height formed by superimposed trapezoidal rings and efliuent in the leaching pool has access to all the effluent openings including those in the space between the tank and the pool wall.

' 4 References Cited UNITED STATES PATENTS 3,240,343 3/ 1966 Werner 210-532 X 3,097,166 7/1963 Monson 210- 3,501,007 3/1970 Davis 61-11 2,796,176 6/1957 Monson 210-261 3,662,918 5/1972 Crawford et al 210-5325 3,630,370 12/1971 'Guina 210-170 THEODORE A. GRANGER, Primary Examiner US. Cl. X.R. 210-532

Images