CA1080862A

CA1080862A - Septic tank

Info

Publication number: CA1080862A
Application number: CA292,526A
Authority: CA
Inventors: Denis Guibault
Original assignee: 3014593 NOVA SCOTIA Co
Current assignee: 3014593 NOVA SCOTIA Co
Priority date: 1977-12-06
Filing date: 1977-12-06
Publication date: 1980-07-01

Abstract

A septic tank molded of plastic, preferably of polyethylene, and including a shell unitarily forming a bottom, opposite ends, opposite sides, and a top with reinforcing corrugations in the opposite sides, opposite ends and top. The corrugations in the sides define ridges and grooves advantageously extending longitudinally upright and include predetermined pairs of internal corrugation grooves with the corrugation grooves of each pair mutually facing each other transversely of the tank. Baffles are advantageously mounted in the predetermined pairs of grooves respectively. Each baffle has opposite lateral edges of transverse outline adapted to tightly fit in the corresponding pair of grooves and has an intermediate corrugated portion whose resilience provides spring engagement in the corresponding grooves.

Description

~is invention relate~ to a ~eptic tank~ and mors particularly, to a 9~ptiG tank o~ the molded tank.
Thsre hava 90 ~ar been propos~d septic tanks of the above type which are either made o~ concrete or of fibsrgla~s. Ths septic tank of prscast concrets~ although of relatively thin wall construction i8 relatively too h~avy for convenient installation even with a backhoe and for transportation to some sites. On the other hand, fiberglass is rather expeneive and al~Ro relativsly heavy.
It i9 a general object of the prssent inv~ntion to provide a molded ssptic tank which subRtantid ly obviate~ the abova-mentioned disadvantages.
It i9 an object of ths present invention to provide a molded septic tank which is of relatively inexpensive and simple construction and easy to install even without recourse to machinery to lower it into ths ground. ;
~` It i~ another object of the prasent invention to provide a septic tank o~ ths above type which includes a molded shell o~ unitary construction assuring against leakage thereof.
It is a furth~r object of ths present invention to provids a molded septic tank which is made of a non-corro~ive, chemically resistant~ and moldable material.
It is still another ob3ect of ths present invention to provide a molded ssptic tank which is reinforced by corrugations adv~ntageously arranged to fit the bQffles in the internal grooves ~ -formed by such corrugation~
It is a still further objeot of the pressnt invention to provide a molded septic tank wherein the ba~les aru also ad~antageously mads with corrugations snd oppoRite lateral edges to tightly fit with ~ ;
~ spring biased engagement in a pair of mutually ~acing internal grooves ~ --30 de~inod by the corrugations.
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Tha abov~ and other nbjects and advantag~s o~ the present invention will be better understood with refarence to th~ ~ollowing detailed description of a prsferred ~r~bodimont th~reof which is illustrated, by way of example, in the ancompanying drawings; in which J
Figure 1 is a sida slevation uiew, partly broken away, of a molded septic tank according to the present invention;
Figurn 2 is an nnd visw o~ th~ molded septic tank o~ Figore 1 with part broken away;
Figure 3 i8 a top vi~w o~ th0 septic with ths covers tharson;
Figure 4 is a sida elevation view of a nover and o~ a corresponding aperture portion o~ the same septic tank; and Figura 5 is a perspective view of a baffle forming part of the septic tank.
; Th~ illustrated septic tank includes a sh611 1 which i8 molded o~ polyethylene and integrally forms a bottom 2, opposite ends 3~ opposite sides 4, and a top 5~ Each of the two opposite sides includss corrugations longitudinally extending upward and laterally spaced apart longitudinally of th~ septic tank. Each corrugation de~ines an external ridge 6 with a correspDnding internal grooua 7 or an internal ridge a with a corresponding exte~nal groove 9. The corrugations on th~ opposite 5idBS 0~ thB
shell are transversely aligned in p~irs relative o~ the shellO The ridges 6 and grooves 7 are rigidly connected across ths top 5 o~ the shell by intermediate ridges 10 and grooves 11, similarly a~ the - internal ridges 7 and grooves 9. The two oorrugations o~ sach of the abov~-mentioned pair~ extend in a common transverse plane orthogonally to the longitudinal direction o~ the shell~
The opposits ends 3 of the shell are each provlded with corrugations defining the ridges ~2 which longitudinally sxtend . - 3 -'' :

transversely of the shell; that is, ortho~onally relative to the corrugations o~ the ~ides 4. A ~ewage inlet 13 is providsd in one ond 3 near the top 5 and a clari~ied liquid outlet 14 i9 provided in tho other end 3 at a lower level than the inlet 13. The liquid outlet 14 defin~s the liquid level in the tank~ as indicated by the dotted lina 15.
An inlet baf~le 16, an intermediate baffls 18 are positioned in the shell 1~ Each of the baf~les 15 and lB is formed of ona bafPle s6ction 19 while the baffle 17 is ~ormed of two ba~fle sections 19, as the one shown in Figure 5. Each baffle ~action 19 or baffle 16, 17, and 18 has oppoRite lateral sides 20 which are of transver~s outline complamentary to the transversa autline of the afore-mentioned internal groov~ 7 to tightly fit in a corresponding pair of mutually ~acing intsrnal grooves.
Each baffle section 19 includas a co~rugatad intermsdiate portion 21 whos0 re~ilisnceproduces spring engagement o~ the abDve lateral edg~s in the corresponding pair of mutually facing grooves 7. The relative positions and ~unctions of the baffles 16~ 17~ and 15 are a~ already known in the alrsady known septic tanks.
The top S of the shell 1 is formed with a pair of accsss apertures 22 at the opposita ends thereo~ respectivelyO Each aperture ~20 22 i5 prDvided with a circular ridge 23. A cover closes each acce3s aperture 22 and includes an annular portion 24 and a cap portion 25 The annular portion 24 i~ formsd with a circular groove ~or tight sngagement of the ridge 23 therein. The annular portion 24 also includes a central aperture whioh is closed by a cap portion 25.
Each ba~fle section 19 and cover portion 24 and 25 is al~o made of molded polyethylene.

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Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED, ARE DEFINED AS FOLLOWS:

1) A molded septic tank comprising a molded shall integrally forming a bottom, opposite ends, opposite sides, and a top, said opposite sides including corrugations laterally spaced apart from each other along the length of said shell and including pairs of corrugation grooves on the internal face of said opposite sides, the grooves of each of said pairs of corrugation grooves mutually facing each other and extending in transverse planes respectively relative to the molded shell, and baffles engaged in said pairs of grooves respectively and longitudinally separating the internal space of said shell into successive zones serially arranged in the end-to-end direction of the tank.

2) A molded septic tank as defined in claim 1, wherein each of said baffles includes opposite lateral edges of complementary transverse outline relative to said grooves and tightly fitting in the latter.

3) A molded septic tank as defined in claim 1, wherein each of said baffles includes an intermediate portion having corrugations longitudinally extending operatively upright and producing spring engagement of the corresponding opposite lateral edges into the corresponding pair of grooves.

4) A molded septic tank as defined in claim 1, wherein said opposite ends include corrugations longitudinally extending transversely relative to said corrugations of the opposite sides of the shell.

5) A molded septic tank as defined in claim 1, wherein said shell is integrally molded of polyethylene.

6) A molded septic tank is defined in claim 2, wherein each of said baffles includes an intermediate portion having corrugations longitudinally extending operatively upright and producing spring engagement of the corresponding opposite lateral edges into the corresponding pair of grooves, said opposite ends include corrugations longitudinally extending transversely relative to said corrugations of the opposite sides of the shell,said shell is integrally molded of polyethylene, said pairs of grooves include a first and a third pairs of grooves close to said opposite ends respectively and a second pair of grooves substantially midway between said first and third pairs of grooves and said baffles include a first, a second, and a third baffles engaged in said first, second, and third pairs of grooves respectively.

7) A molded septic tank as defined in claim 6, wherein said top includes a pair of access apertures at the opposite ends thereof communicating with the opposite sides respectively of said second baffle and a cover tightly fits over each of said access apertures.

8) A molded septic tank as defined in claim 7, wherein an annular ridge extends around each of said access apertures, each of said covers includes an outer ring portion and a cap portion, said outer ring portion includes an annular groove tightly engaging the corresponding annular ridge, and said cap portion tightly closes the inner aperture defined by said ring portion.

9) A molded septic tank as defined in claim 8, wherein each of said ring portions and cap portions is molded of polyethylene.