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Патент USA US3023630

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March 6, 1962
D. w. HOFERER
METHOD AND APPARATUS FOR LOADING A TANK
WITH A DESIRED WEIGHT OF LIQUID
Filed Aug. 22, 1955
3,023,620
DANIEL 14/. .HOFERER’
IN VEN TOR.
ATTORNEYS.
United States Patent‘ O?ice
3,®23,620
Patented Mar. 6, .1962“
1
2
3,023,620
vertical movement within the tank T by means of a sup-v
port member, generally designated 14. The support mem
ber 14 includes a vertically extending column 16 having
METHOD AND APPTU§ FOR LOADING A
TANK WITH A DESRED WEIGHT @F LIQUID» .
Daniel W. Hoferer, 3514 Gaviota, Long Beach, Qaiit‘.
Filed Aug. 22, 1955, Ser. No. 529,729
7 Claims. (or. 73-309)
a pointed lower end 18. The upper portion of this column
16 is adapted to be releasably a?ixed to the tank T at one
side of its ?lling chute 10‘. To this end, the upper por
tion of column 16 is attached to a pair of vertically
spaced arms 20 and 22 formed at their free ends with
The present invention relates generally to the ?eld of
liquid-containing tanks and more particularly to a novel
method and apparatus for loading a tank with a desired
weight of liquid.
vertically aligned loops 24 and 26, respectively. Dis~
10 posed within the aligned loops 24 and 26 is a ‘clamp
member, generally designated 28. This clamp member
It is well known that most, if not all, of the states have
laws limiting the load which may be carried by a tank
28 includes an anchor shoe 30 which is secured to the
lower end of a vertically extending leg 32. The upper
truck or tank trailer. These laws are designed to protect
surface of this anchor shoe 30 is knurled and normally
abuts the underside of the top wall 33 of the tank T. The
intermediate portion of this leg 32 is carried within the
loop 26 formed on the lower arm 22. The upper por
tion of the leg 32 is ‘secured to the lower portion of a
push rod 34. The intermediate portion of this push rod
34 is slidably disposed within the loop 24 of the upper
arm 20. A helical compression spring 36 is interposed
between a retainer 38 on the lower portion of the push
the roadways from damage by overloaded tank trucks
or trailers. Although most operators are anxious to con
form with such laws, various di?iculties are encountered
in loading a tank truck or trailer with a desired weight
of liquid. In most cases weighing scales are not avail
able for use at the liquid loading site. Accordingly, it
is necessary to obtain an approximation of the weight
of the liquid by ?rst ?nding the volume thereof; and
thereafter computing the weight from such volume,.when
rod 34 and the lower eye element 22. With this ar
taken in conjunction with the temperature at which the
rangement, the column 16 will normally be held in a
liquid exists and the speci?c gravity thereof. Inasmuch 25 stationary position within the tank T by the clamp mem
as the temperature of the liquid being loaded may change
ber 28 and the pointed lower end of the column, the
during a loading operation or within the varying strata of
latter abutting the lower surface of the tank T. In order
the load, this method of computing the Weight is not
to release the column 16, the push rod 3-4 is urged down
always accurate. Additionally, the load may consist of
wardly against the force of the spring 36. This action
two or more separate liquids having di?erent speci?c
gravities, and mixed in an unknown proportion. As used
herein, the term “variable liquid” may mean not only
moves the anchor shoe 30 out of engagement with the
top wall 33 of the tank T.
a plurality of liquids having different speci?c gravities
and mixed in unknown proportion, but also a single
liquid having strata of varying densities Within the tank,
as for example, due to temperature changes occurring
35
The lower portion of the ?oat member 12 is slidably
supported by the lower portion of the column 16 by a
guide 40 having a ring 42 from which extends a plu~4
rality of downwardly and radially inwardly directed guide
?ngers 43. The upper end of the ?oat 12 is af?xed tov
the lower end of a vertically extending ?oat rod
It is a major object of the present invention to pro
44. The lower portion of this ?oat rod elementelement"
is slid-,
vide a method and apparatus for loading a tank with a
ably disposed within a loop 46 formed in the free end
desired weight of liquid.
4:0 of a horizontally extending arm 48 which is secured to
Another object is to provide a method and apparatus
the upper portion of the column 16. The upper portion
for loading a tank with a desired weight of liquid which
of the ?oat rod element 44 is slidably disposed within a‘
is not aifected by the temperature of the liquid or whether
bore 50 formed in a horizontally extending arm 52 which‘
or not a plurality of liquids make up the load.
is affixed to the upper end of the column 16. An indicaté
Yet another object is to provide a method for loading
ing disc 54 is rigidly a?‘ixed to the intermediate portion‘
a tank with a desired weight of liquid which is fool-proof
of the ?oat rod 44. This indicator disc 54 is adapted
and does not require the services of a skilled operator.
to cooperate with a pointer element 56 which is con-i
An additional object is to provide an apparatus of the
nected to the upper portion of the column 16, for a pur
aforedescribed nature which is simple in design and
pose to be fully set forth hereinafter. A plurality of
rugged of construction whereby it may afford a long 50 weights 58 are removably supported by the upper end ‘of
and useful service life.
the ?oat rod, also for a purpose to be set forth herein
Another object is to provide an apparatus of the afore
after.
described nature which may be constructed and main
In practicing the present invention it is important that
tained at low cost.
the ?oat 12 and its ?oat rod 44 be completely free with
These and other objects and advantages of the present 55 respect to their supports. To this end the ?oat and its
invention will become apparent from the following de
?oat rod are made rotatable within their guides. In
tailed description, when taken in conjunction with the
carrying out the invention the tank T is initially ?lled
appended drawing, wherein:
during loading.
,
FIGURE 1 is a perspective view showing a preferred
form of apparatus which may be employed to carry out
the present invention.
Referring to the drawing, there is shown a tank T
which is to be ?lled with a desired weight of liquid L
by means of the novel apparatus and method of the
present invention. The tank T may be that of a con
ventional tank truck, tank trailer, railroad tank car or
alternately it may represent a stationary tank. The upper
portion of the tank T is formed with a cylindrical ?lling
chute 10.
-
The preferred form of apparatus embodying the pres
ent invention includes a ?oat 12 which is supported for
with a desired weight of a reference liquid as for ex
ample, the legal load that may be transported within the
tank T. The reference liquid will preferably be water,
although other suitable liquids may be employed. The’
loading of the water should be carried out at a tempera
ture at which its weight is known, i.e. 60° F. The load
ing of the reference liquid may take place While the tank
_T is disposed upon a suitable weighing scale. Alter
nately, the desired load may be computed by means of
the calibration chart for the particular tank T. This
calibration chart indicates the exact volume within the
tank for any particular elevation therein. Regardless
of the manner in which the legal load in the desired
weight is obtained, once the desired Weight of reference
3,023,620
3
liquid has been placed Within the tank, the ?oat 12 and
its ?oat rod 44 will rise to a certain height. Accordingly,
the indicator disc 54 will also rise and remain at a cer
4
water, said volume extending from the surface of said
water to a depth slightly less than the depth of said
water and having a substantially uniform cross-section,
the upper portion of the column 16 until it is in exact
establishing a reference line between a ?rst point on said
?oat means and a second point that is ?xed relative to
horizontal alignment with the indicator disc 54. The
pointer element 56 is then locked in this position by its
said tank, emptying said water from said tank, and re
?lling said tank with said variable liquid until said ?rst
tain height. The pointer element 56 is then adjusted upon
point is aligned with said second point.
thumb screw 60. The reference liquid is then drained
3. A method of loading a tank with substantially a
from the tank T.
When it is desired to load the tank with a legal load 10 desired weight of a variable liquid which includes, ?lling
said tank to said desired weight with a reference liquid,
of a liquid to be transported, the operator ?rst makes
inserting ?oat means in said reference liquid to displace
certain that the ?oat 12 and its ?oat rod 44 are free rela
a volume of said reference liquid, said volume extending
tive ‘to their guide. Next, the liquid is loaded into the
from the top of said reference liquid to a depth slightly
tank T until it has reached a level which causes the ?oat
12 and hence the indicator disc 54 to be lifted until the 15 less than the depth of said reference liquid, establishing
a horizontal reference line between a ?rst point on the
latter is in horizontal alignment with the pointer element
exposed portion of said ?oat means and a second point
56. Loading of the liquid is then stopped. It will be
that is ?xed relative to said tank, emptying said reference
apparent that at this time the weight of‘ the liquid being
liquid from said tank, and re-?lling said tank with said
loaded will equal the weight of the reference liquid re
quired to maintain the ?oat 12 and the indicator disc 54 20 variable liquid until said ?rst point is horizontally aligned
with said second point.
in horizontal alignment with the pointer element 56.
4. A method of loading a tank with substantially a
This will be true regardless of the temperature of the
desired weight of a variable liquid which includes, ?lling
liquid and regardless of the number of components mak
said tank to said desired weight with water, inserting ?oat
ing up the liquid.
It should be observed that with all of the weights 58 25 means in said water to displace a volume of said water,
said volume extending from the surface of said water
secured to the top of the ?oat rod 44, the ?oat will be
to a depth slightly less than the depth of said water and
adjusted, to indicate the desired legal load. These weights
are so calibrated to provide a proportion of the legal load
having a substantially uniform cross~section, establish
ing a horizontal reference line between a ?rst point on
depending upon the number of weights carried by the
?oat rod 44. In the embodiment disclosed, four such 30 the exposed portion of said ?oat means and a second
weights 58 are shown a?ixed to the ?oat rod 44 hence,
point that is ?xed relative to said tank, emptying said
each of these weights are proportional to twenty-?ve
percent of the desired legal liquid load.
water from said tank, and re-?lling said tank with said
variable liquid until said ?rst point is horizontally aligned
It should be observed that in some instances it may be
with said second point.
desirable to employ a gallonage indicator in conjunc 35
5. Apparatus for loading a tank with a predetermined
tion with the aforedescribed load weighing device. Such
weight of variable liquid comprising: a vertically elon
a gallonage indicator may be provided without depart
gated substantially cylindrical ?oat of su?icient density
ing from the present invention. Additionally, different
to beibuoyantly submersible to a predetermined extent
forms of supports for holding the ?oat in place maybe
in a reference liquid of a depth less than the height of
employed without departing from the invention. In this 40 said ?oat; a coaxially upwardly extending elongated rod
regard, under certain circumstances where in?ammable
on said ?oat having a horizontally disposed indicator
liquids are being carried, such as gasoline or light oil,
disc; a vertically elongated column having a horizontally
the use of a ?oat support having relatively moving parts
extending arm at its upper end formed with a bore slid
may be prohibited. Under such circumstances, a rigid
ably receiving said rod of said ?oat; a pair of horizontally
?oat support could be employed in conjunction with a 45 extending vertically spaced-apart arms on said column;
removable ?oat. In this way the ?oat could be readily
a generally L-shaped member having a vertically extend
cleaned‘ after each weighing operation. In any event,
ing portion slidable through a pair of aligned grooves
however, the supporting column for the ?oat must be
‘formed in said pair of arms and having a horizontally
maintained in vertical alignment with the tank in order
extending anchor shoe engageable with a downwardly
to insure accurate results, and additionally the bottom of 50 facing surface of a tank; an abutment on said vertically
the ?oat should be free of the bottom of the tank T,
extending portion of said L-shaped member between said
when the indicator disc 54 is in horizontal alignment
pair of arms; a spring interposed between said abutment
with the pointer element 56.
and the lower one of said pair of arms to bias the lower‘
Various modi?cations and changes may be made with
end
of said column into engagement with an upwardly
respect to the foregoing description without departing 55
facing surface of a tank; a guide ring on the lower end
from the spirit of the invention or the scope of the fol
of said column having a plurality of radially inwardly
extending ?ngers surrounding the lower end of said
?oat, said ring, ?ngers and said bore of said ?rst-men;
1. A method of loading a tank with substantially a
desired weight of a variable liquid which includes, ?lling 60 tioned arm being coaxially arranged and adapted to
maintain said ?oat in vertically upright position when
said tank to said desired weight with a reference liquid,
buoyant; and a pointer element on said column opposite
inserting ?oat means in said reference liquid to displace
said ?oat rod that is vertically adjustable relative to said
a volume of said reference liquid, said volume extending
column.
from the top of said reference liquid to a depth slightly
6. A method of loading a tank with substantially a
less than the depth of said reference liquid, establishing a
desired
weight of a variable liquid which includes: ?lling
reference line between a ?rst point on said ?oat means
said tank to said desired weight with a reference liquid,
and a second point that is ?xed relative to said tank,
immersing a ?oat in said reference liquid to displace a
emptying said reference liquid ‘from said tank, and re
?lling said tank with said variable liquid until said ?rst 70 vertical column of said reference liquid extending from
the surface to a depth slightly less than the depth of said
point is aligned with said second point.
reference liquid, whereby said immersed ?oat is buoyant
, 2. A method of loading a tank with substantially a
ly supported by the hydrostatic pressure at its lower end,
desired‘ weight of a variable liquid which includes, ?lling
establishing a relationship between a point on said
said tank to said desired weight with water, inserting
?oat means in said, water to displace a volume of said 75 buoyantly supported ?oat means and a?xed point on
lowing claims.
I claim:
5
6
said tank, emptying said reference liquid from said tank,
References Cited in the ?le of this patent
UNITED STATES PATENTS
and ?lling said tank with a variable liquid to a depth
sufficient to buoyantly support said ?oat means and to
232,245
756,905
desired weight of a variable liquid, said weight consisting
763,716
967,378
of an absolute volume of said liquid and a hydrostatic
988,342
weight of strata of said variable liquid superimposed on
1,646,317
said absolute volume, comprising: ?lling said tank to said
desired weight with a reference liquid, displacing a ver 10 2,001,335
2,038,273
tical volume of said reference liquid from the surface
2,189,236
to a depth less than the depth of said reference liquid
with a ?oat means immersed in said reference liquid,
2,457,905
said ?oat means thus being buoyantly supported above
2,614,578
said absolute volume, establishing a relationship between 15 2,653,478
re-establish the same relationship of said points.
7. A method of loading a tank with substantially a
a point on said buoyantly supported ?oat means and a
1880
1904
1904
Hillmer ____________ __ Aug. 16,
Hillmer ______________ __ Apr. 4,
1910
1911
1927
1935
1936
1940
1949
1952
1953
Rein ______________ __ Oct.
18,
Urfer ______________ __ May 14,
~Eynon ______________ __ Apr. 21,
Watson ______________ __ Feb. 6,
Korody ______________ __ Jan. 4,
Stickney ____________ __ Oct. 21,
Harper ____________ .._ Sept. 29,
FOREIGN PATENTS
?xed point on said tank, emptying said reference liquid
from said tank, and ?lling said tank with a variable liquid
248,353
475,157
to a depth su?icient to buoyantly support said ?oat means
and to re-establish the same relationship of said points.
Deschamps __________ __ Sept. 14,
Stalting ____________ __ Apr. 12,
Bray ________________ __ June 28,
20
Germany ____________ -_ June 20,
France ______________ __ Feb. 2,
1912
1915
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