SEPTIC TANK

FOSSE SEPTIQUE

English Abstract

A B S T R A C T
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.

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.

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
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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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