U.S. patent number 3,650,310 [Application Number 05/055,427] was granted by the patent office on 1972-03-21 for combination boat trim tab and heat exchanger.
This patent grant is currently assigned to Stewart & Stevenson Services, Inc.. Invention is credited to Ezra E. Childress.
United States Patent |
3,650,310 |
Childress |
March 21, 1972 |
COMBINATION BOAT TRIM TAB AND HEAT EXCHANGER
Abstract
A combination boat trim tab and heat exchanger for an engine
driven boat in which the trim tab body is hollow and has an inlet
and outlet connected to the hollow interior and is adapted to be
connected to the boat engine cooling system with elongate fins
secured to the bottom of the outside of the body and axially
aligned with the longitudinal axis of the boat. The hollow interior
of the body including a serpentine passageway between the inlet and
outlet thereby increasing the heat exchange area in contact with
the engine cooling liquid. Elongate cooling fins secured to the
interior of the bottom of the body for increasing the cooling
surface.
Inventors: |
Childress; Ezra E. (Houston,
TX) |
Assignee: |
Stewart & Stevenson Services,
Inc. (Houston, TX)
|
Family
ID: |
21997721 |
Appl.
No.: |
05/055,427 |
Filed: |
July 16, 1970 |
Current U.S.
Class: |
165/44; 114/286;
440/88HE; 440/88R; 440/61T; 440/88M; 440/88C |
Current CPC
Class: |
F28D
1/022 (20130101); B63H 20/245 (20130101); B63H
21/14 (20130101); B63H 21/38 (20130101); B63B
39/061 (20130101); B63H 20/285 (20130101); F28F
3/12 (20130101); B63H 21/10 (20130101) |
Current International
Class: |
B63B
39/00 (20060101); B63B 39/06 (20060101); F28F
3/12 (20060101); F28F 3/00 (20060101); F28f
007/00 () |
Field of
Search: |
;165/41,44 ;115/.5
;114/66.5P |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Matteson; Frederick L.
Assistant Examiner: Anderson; W. C.
Claims
What is claimed is:
1. A combination boat trim tab and heat exchanger for an engine
driven boat comprising,
a generally horizontally positioned trim tab body having means
adapting said body to be secured to a boat and having a hollow
interior,
an inlet and an outlet connected to the interior of the body and
spaced from each other and adjacent opposite sides and adapted to
be connected to the boat engine cooling system, and
elongate cooling fins secured to the bottom of the outside of the
body and axially aligned with the longitudinal axis of the
boat.
2. The apparatus of claim 1 including,
said hollow interior of the body having a serpentine passageway
between the inlet and outlet thereby increasing the heat exchange
area of the cooling liquid flowing therein.
3. The apparatus of claim 1 including,
elongate cooling fins secured to the interior of the bottom of the
body.
4. A combination boat trim tab and heat exchanger for an engine
driven boat comprising,
a flat bottom generally horizontally positioned trim tab body
having means adapting said body to be secured to a boat,
said body being hollow and including an inlet and an outlet
connected to the interior of the body and spaced from each other
and adjacent opposite sides and adapted to be connected to the boat
engine cooling system,
said hollow interior of the body including a serpentine passageway
between the inlet and outlet thereby increasing the heat exchange
cooling area between the cooling liquid and the body,
elongate fins secured to the bottom of the outside of the body and
axially aligned with the longitudinal axis of the boat, and
elongate cooling fins secured to the interior of the bottom of the
body.
5. The apparatus of claim 4 wherein
the interior cooling fins are generally aligned with the serpentine
passageway.
Description
BACKGROUND OF THE INVENTION
It is often desirable to provide sufficient cooling or to increase
the cooling capacity of an engine operating a boat. Since the water
in which the boat is operated provides a tremendous reservoir of
cooling liquid, it would be useful to use the water for cooling the
boat engine. However, since the waters in which boats operate are
frequently corrosive or damaging, for example, salt water, to the
internal parts of the engine, it is not generally desirable to use
the boating waters as a direct cooling source. But, of course, any
indirect cooling structure should be efficient, and should not
interfere with the operational performance of the boat.
Since boat trim tabs do not interfere with, but on the contrary
assist, the operational performance of a boat, the present
invention is directed to providing a combination boat trim tab and
heat exchanger for an engine driven boat which will increase the
cooling capacity of the engine without subjecting the internal
working parts of the engine to the water in which the boat operates
and yet will not interfere with the operational performance of the
boat. The combination boat trim tab and heat exchanger of the
present invention is also directed to provide sufficient cooling
for the engine both when the boat is moving and while it rests.
SUMMARY
The present invention is directed to a combination boat trim tab
and heat exchanger for an engine driven boat in which the trim tab
body is adapted to be secured to a boat and has a hollow interior
with an inlet and outlet connected to the hollow interior of the
body and spaced from each other and adapted to be connected to the
boat engine cooling system.
Another feature of the present invention is the provision of
elongate cooling fins secured to the bottom of the outside of the
boat to provide an increased heat exchange area and which are
axially aligned with the longitudinal axis of the boat so as not to
decrease the operational performance of the trim tab and boat.
Still another feature of the present invention is the provision of
a hollow trim tab body having a cooling inlet and outlet wherein
the body includes an internal serpentine passageway between the
inlet and the outlet thereby increasing the heat exchange area
between the cooling liquid and the body.
A still further feature of the present invention is the provision
of internal elongate cooling fins secured to the interior of the
bottom of the body wherein the interior fins are preferably aligned
with the majority of a serpentine passageway.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a fragmentary elevational view of an engine driven boat
provided with a pair of combination trim tabs and heat
exchangers,
FIG. 2 is an enlarged fragmentary elevational view of the improved
trim tab of the present invention,
FIG. 3 is a cross-sectional view taken along the line 3--3 of FIG.
2, and
FIG. 4 is an elevational view of the trim tab of the present
invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawing, and particularly FIGS. 1 and 2, the
boat 10 of the present invention generally includes an engine 12
driving a propeller 14 as is conventional.
One or more trim tabs generally indicated by the reference numeral
16 may be provided connected to the boat 10. The trim tab 16 may
either be fixedly secured to the boat or as shown in FIG. 2
pivotally secured by one or more hinges 18 and movably positioned
by a suitable means such as a hydraulic piston and cylinder
assembly 20 connected at one end 22 to the boat and at a second end
24 to the trim tab 16.
The trim tab 16 of the present invention includes a hollow interior
25, as best seen in FIGS. 3 and 4, and includes an inlet 26 and an
outlet 28 in communication with the hollow interior 25. The inlet
26 and outlet 28 are spaced from each other and adjacent opposite
sides of the trim tab 16 to insure that the cooling liquid flowing
from the inlet 26 to the outlet 28 comes in contact with a greater
area of the body of the trim tab 16 for increased heat exchange. As
best seen in FIG. 1, the inlets 26 and outlets 28 from the trim
tabs 16 are suitably connected by lines 30 and 32, respectively, to
the cooling system of the boat engine 12. The trim tab 16 is of a
suitable material such as metal having a high rate of thermal
conductivity for heat exchange between the engine cooling fluid
flowing through the interior of the trim tabs 16 and the water
contacting the outside of the trim tabs 16.
Of course, while the boat 10 is at rest or idling, the boat 10 will
sit lower in the water and both the bottom surface 34 and the top
surface 36 of the trim tab 16 will be underwater. Since at idling
or low speeds, the heat dissipation requirements of the engine
cooling system are lower, the submersion of the trim tab 16
underwater, even though at rest, will provide a sufficient cooling
area to satisfy the engine cooling requirements.
However, as the boat 10 gets underway, the action of the trim tabs
16 will cause the boat 10 to rise up on top of the water and only
the lower surface 34 of the trim tab 16 will be in contact with the
water. Therefore, in order to increase the heat exchange capacity
of the trim tab 16 relative to the water, a plurality of the
elongate cooling fins 38 are provided secured to preferably the
entire bottom 34 of the outside of the trim tab body. In addition,
the elongate cooling fins 38 are aligned with the longitudinal axis
of the boat 10 to provide a structure which will not interfere with
the operational performance of the trim tab 16 nor the boat 10.
In order to further increase the cooling capacity of the trim tab
16, and as best seen in FIGS. 3 and 4, partitions 40, 42 and 44 are
provided in the hollow interior 25 of the trim tab 16 whereby the
hollow interior 25 forms a serpentine passageway between the inlet
26 and 28 since the barriers 40, 42 and 44 alternately extend from
opposite sides, but do not extend entirely across the hollow
interior 25 of the trim tab 16. Therefore, the engine cooling fluid
flowing from the inlet 26 to the outlet 28 will contact a greater
surface area and thus increase the heat exchange cooling area
between the cooling liquid and the body of the trim tab 16.
Additional cooling may be provided if necessary by providing
elongate cooling fins 50 secured to the interior of the bottom 34
of the trim tab 16. Preferably, the interior cooling fins 50 are
generally aligned with the major passageways of the serpentine path
of flow of the cooling liquid from the inlet 26 to the outlet
28.
In use, and as previously indicated, with the boat 10 at rest and
idling the entire trim tab 16 will be submerged in the water and
even though not in moving contact with the water will provide
sufficient cooling to cool the engine under light loads. And when
the boat 10 is underway and the engine is under a heavier load,
while only the bottom 34 of the trim tab 16 will be in contact with
the water, sufficient heat exchange will be provided by the water
in which the boat travels moving across the exterior cooling fins
30 while the engine cooling fluid flows through the interior 25 of
the trim tab 16. In addition the serpentine path of flow and the
interior cooling fins 50 increase the heat exchange.
The present invention, therefore, is well adapted to carry out the
objects and attain the ends and advantages mentioned as well as
others inherent therein.
* * * * *