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Патент USA US3089463

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May 14, 1963
F. E. BUCK ETAL
3,089,453
FLOAT FOR TOW CABLES
Filed Dec. 21. 1961
F» 220
21
230
21
23d
222d
26
IN VENTORS
FRANCIS E. BUCK
JOHN E. SMH'H
BY%
TTORNEY
United States’ Patent 0 "ice
v
Patented May3”l0:8
14,9 ,4
1963
2
1
Referring now to FIG. 1 there is shown a ?oat 10 hav
.
3,089,453
.
FLOAT FOR TOW CABLES
Francis E. Buck, Philadelphia, and John E. Smith, Hat
boro, Pa., assignors to the United States of America
as represented by the Secretary of the Navy
Filed Dec. 21, 1961, Ser. No. 161,323
_
5 Claims.
ing a streamlined con?guration to reduce drag.
A series of three inch thick Styrofoam boards 1111
through 11]’ are strung through an opening through the
center of each on a quarter inch corrosion resistant steel
rod 12. i The Styrofoam boards taper up to a maximum
diameter at Styrofoam board 1111 and gradually taper
(Cl. 114-235)
down to a minimum diameter at Styrofoam board 111]‘
which has a diameter less than the diameter of Styrofoam
The invention described herein may be manufactured 10 board 110 and which has a thickness of approximately
two inches.
and used by or for the government of the United States
A relatively thin aluminum plate 13 is inserted between
of America for governmental purposes without the pay
Styrofoam board 11]‘ and tail assembly 14 which is to
ment of any royalties thereon or therefor.
be more ‘fully described hereinbelow. An aluminum
This invention relates to ?oats and more particularly to
variable buoyancy, low drag ?oats for supporting tow 15 alloy nose plate 15 is placed on rod 12 through a hole in
(Granted under Title 35, US. Code (1952), see. 266)
if
its center. The whole assembly is secured together by
cables used in minesweeping operations.
‘In minesweeping operations where towing of submerged
means of nuts 16 and 17 respectively threaded on each end
of rod 12. Nose plate 15 and plate 13 equally distribute
the force on Styrofoam boards 11a and 11]‘, respectively,
hydrofoil arrays in shallow water with long nonbuoyant
cables is performed, the cables have a tendency to drag on
the bottom and in many instances ‘become so severely 20 when nuts 16 and 17 are tightened to form a rigid body.
Each of Styrofoam boards 11h, 111', and 11]’ have four
damaged that the towing operation is completely dis
equally spaced holes drilled therethrough. One of the
rupted. Therefore, it is necessary to support the towing
holes 18a, 19a, and 20a of respective boards 11h, 111‘, and
cables Within the water to prevent bottom drag.
11]‘ is shown in the sectioned part of FIG. 1.
In the past heavy metal ?oats have been used for the
25
The holes of individual boards are of equal diameter.
support of nonbuoyant tow cables.
The holes of Styrofoam board 11]‘ are somewhat smaller
These metal ?oats are large in size, excessive in weight,
than those of Styrofoam board 111‘, and the holes of Styro
high in cost, and are subject to corrosion which reduces
foam board 11i are somewhat smaller than the holes of
the life expectancy of the floats.
Styrofoam board 11h, since the size of the holes in each
The present invention contemplates a lightweight, vari
able buoyancy, low drag ?oat for operation either on the 30 board is determined by the overall diameter of each
board. However, the three sets of holes are of su?icient
diameter so that, when the boards are properly aligned,
water surface or completely submerged in the water to a
depth of 170 feet.
each hole in a board communicates with respective holes
in the other boards and together form four cavities, one
of which is visible in FIG. 1.
Four relatively small holes 90° apart are radially drilled
in Styrofoam board 111'. One of these holes 2111 is shown
in the section of FIG. 1.
Thus, when ?oat 10 is actually in the water supporting
The present invention contemplates the use of low cost
Styrofoam, or other similar commercially available prod
ucts, in ?oats of a streamlined con?guration to provide
light weight and low drag. The feature of variable buoy
ancy is obtained by varying the amount of Styrofoam used
in the ?oat by adding or removing ?at sections of Styro
foam to or from the ?oat.
Since Styrofoam does not 40
a cable, the cavities ?ll up with water via hole 21m and
absorb water and is not subject to corrosion, the ?oat of
the present invention is leakproof and corrosion resistant.
Since the ?oat of the present invention has a much
higher ratio of buoyancy to weight compared to previously
its counterparts to maintain the tail assembly down with
I respect to the nose thereby insuring that the ?oat will not
nose down as it streams through the water.
Tail assembly 14 comprises a drilled cylindrical tube
used ?oats, a substantial reduction in size is obtainable.
45 21 to which four ?ns 22a, 22b, 22c, and 22d of conven
‘Therefore, it is an object of the present invention to
tional con?guration are welded in a series of intermittent
provide a lightweight, low drag ?oat which is low in cost
of construction.
'Another object of the present invention is to provide a
welds. The first series of welds are indicated by reference
numerals 23a through 2311 on FIG. 2.
Tail assembly 14 further comprises four quarter sec
?oat with a variable buoyancy and having a‘ construction 50
tions 24 through 27 of Styrofoam which are bonded to
which enables the ?oat to be operated at the surface of
the tail ?ns by means of an epoxy resin. As best seen in
the water or submerged in the water down to a predeter
FIG. 1 each of the Styrofoam quarter sections continues
mined depth.
the taper to the end of the tail assembly.
A further object of the present invention is the provision
In assembling ?oat 10 tail assembly is placed on rod
of an easily dismantled, low cost, lightweight, low drag, 55 12‘tbrough the drilled cylindrical tube 21 against plate
variable buoyancy ?oat to be used in supporting tow cables
13. Nut 17 is tightened to abut against the end of tube
to prevent bottom drag which is constructed of leakproof,
21.
corrosion resistant material which has a high buoyancy
There is shown in FIG. 1 and more fully in FIG. 3 a
to weight ratio.
free swiveling strap assembly 28 for attaching the ?oat
Other objects and features of the invention will become 60 10 to a tow cable for the support thereof.
The strap assembly as seen in FIG. 3 comprises ‘a cy~
apparent to those skilled in the art as the disclosure is
made in the following detailed description of a preferred
lindrical tube 29 having a drilled hole 31 through which
rod 12 extends. The tube 29 fully extends through
embodiment of the invention as illustrated in the accom
panying sheet of drawing wherein like reference numerals 65 Styrofoam board He through the center of gravity of
?oat 10 and perpendicular to the plane de?ned by ?ns
refer to like parts and in which:
FIG. 1 is a side view, partly in sect-ion, of the preferred
embodiment of the ?oat of the present invention;
FIG. 2 is an end view of the ?oat assembly of FIG. 1;
and
70
FIG. 3 is a view taken through section 3—-3 of FIG. 1
22a and 2211. Each end of tube 29‘ has a plug 32
securedly ?xed to tube 29 as by a pin 33. The external
ends of the plugs 32 have a threaded bolt 34 integral
therewith extending in an outward direction.
One end 35 of each of aluminum straps 36 has a hole
showing the arrangement of the swivel assembly.
‘40 through which bolts 34 respectively extend.
The
3,039,453
3
4
straps 36 are secured on bolts 34 by a nut 37 and are
said strap assembly means including means for con
necting the ?oat to a tow cable whereby the ?oat
freely rotatable about bolts 34.
The other ends 38 of straps 36 are securely joined as
by a bolt or weld and sandwich a tab 39 which has a hole
41 drilled in one end thereof for attachment to a con
necting cable for a tow cable.
supports the tow cable engaged in towing a body
through the water.
3. A ?oat according to claim 2 wherein said plurality
of members include water trapping means disposed aft of
The buoyancy of the ?oat 10 may be varied by adding
the center of gravity of the ?oat for maintaining the
or removing Styrofoam boards as required.
This pro
?oat in a nose up attitude as the ?oat streams through
the water.
cedure requires changing the length of rod 12 and relocat
ing strap assembly 28 which is easily performed due to 10
4. A ?oat for preventing bottom drag of nonbuoyant
the unique assembly of the ?oat which lends itself to
cables engaged in towing a body through water, compris
convenient dismantling.
ing in combination:
It should be understood, of course, that the foregoing
a plurality of Styrofoam members arranged in abutting
disclosure relates to only a preferred embodiment and
that modi?cations may be made therein without depart 15
ing from the spirit and scope of the invention as set
forth in the appended claims.
What is claimed is:
1. A ?oat for preventing bottom drag of nonbuoyant
cables engaged in towing a body through water, compris 20
ing in combination:
a plurality of lightweight, buoyant members in juxta
positioned relationship to one another,
each of said members con?gured whereby said plurality
of members collectively form a streamlined ?oat,
25
relationship to one another,
each of said members being con?gured whereby said
plurality of members collectively form a streamlined
?oat,
'
a nose plate in abutting relationship to one end of said
plurality of members,
a tail assembly in abutting relationship to the other
end of said plurality of members comprising four
equally spaced ?ns extending radially outward,
an elongated rod having external threads at each end
thereof extending through said nose plate, said plu
rality of members, and said tail assembly,
tail means connected to one end of said plurality of
members for stabilizing the ?oat as it streams through
internally threaded fastener means at each end of said
the water,
tube means passing through the center of gravity of
the ?oat at right angles to the longitudinal axis of 30
strap assembly means pivotally connected to means
connected to said rod at the center of gravity of the
?oat for rotation about an axis perpendicular to said
the ?oat,
means connected to said tube means for supporting a
cable towing a body through the water.
rod,
rod,
said strap assembly means including means for con
necting the ?oat to a tow cable whereby the ?oat
supports the tow cable engaged in towing a body
through the water.
2. A ?oat for preventing bottom drag of nonbuoyant
cables engaged in towing a body through water, compris 35
ing in combination:
5. A ?oat according to claim 4 wherein said plurality
a plurality of ?at, lightweight, buoyant members ar
of members include water trapping means disposed aft
ranged in abutting relationship to one another,
of the center of gravity of the ?oat for maintaining the
each of said members being con?gured whereby said
?oat
in a nose up attitude as the ?oat streams through
plurality of members collectively form a streamlined 4 O the water.
?oat,
a nose plate in abutting relationship to one end of said
plurality of members,
References Cited in the ?le of this patent
a tail assembly in abutting relationship to the other
end of said plurality of members comprising four 45
equally spaced ?ns extending radially outward,
an elongated rod having external threads at each end
thereof extending through said nose plate, said plu
rality of members, and said tail assembly,
internally threaded fastener means at each end of said 50
rod,
strap assembly means pivotally connected to means
connected to said rod at the center of gravity of the
?oat for rotation about an axis perpendicular to said
rod,
UNITED STATES PATENTS
729,992
1,320,604
2,524,863
Baker _______________ __ June 2, 1903
Dame _______________ __ Nov. 4, 1919
White _______________ __ Oct. 10, 1950
2,652,550
2,784,518
2,928,367
Lash _______________ __ Sept. 15, 1953
Boyer ______________ __ Mar. 12, 1957
McCormick _________ __ Mar. 15, 1960
440,871
771,644
Great Britain __________ .._ Jan. 7, 1936
Great Britain __________ __ Apr. 3, 1957
FOREIGN PATENTS
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