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Патент USA US3070070

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Dec. 25, 1962
c. H. HARRISON
3,070,060
MARINE PROPULSION UNIT
Filed Dec. 27, 1960
2 Sheets-Sheet 1
Dec. 25, 1962
c. H. HARRISON
v
3,070,060
MARINE PROPULSION UNIT
Filed Dec. 27, 1960
2 Sheets-Sheet 2
llite States
?lice
' atent
$370,060
Patented Dec. 25, 1962
1
3,070,060
Chmles Henry Harrison, Hampton Hill, England, assignor
MAQTNE PROPULSEON UNIT
to Woodson Marine Limited, London, England
Filed flee. 27, 1960, Ser. No. 78,697
Qlaims priority, application Great Britain Jan. 4, 1960
13 Claims. (Cl. 1155-18}
form attachments for the engine. The connection of the
side plates to the vertical casing is such that different
lengths of tubing may be provided in the ?rst instance as _
required to suit craft with different heights of stem.
The side plates 2 and 3 are supported on trunnions 7
and 8 which take their bearings upon the upper ends of
the U-shaped support frame 9 adapted to be bolted below
to a cross timber such as the timber it}, or any bearers to
This invention relates to marine propulsion units for
suit a particular craft, positioned on the bottom 11 of
use particularly in small cargo carrying boats such as 10 the craft. The size and position of the bearers are chosen
barges and lighters as well as in launches, speedboats,
such as will allow the end edges of the plates 2 and 3
dinghies and like craft, and has for its object the provision
of a propulsion unit adapted to permit inboard engine
to rest upon or just clear the gunwale of the stern 12 of
the craft when the drive casing 4 is vertical.
The propulsion unit is pivotal about the common axis
mounting thereof in a variety of craft of different forms
of construction in a simple and convenient manner.
15 of the trunnions 7 and 8 and can be made to assume the
A further object of the inventionis to provide an ar
position shown by the chain dotted lines 13, by means
rangement wherein it is simple to displace the propeller
of a handle, not shown, vin which the propeller is lifted
clear of the water. The U-shaped support frame 9 is
or obstacles, e.g. when in use in shallow water. provided with horizontal struts 14 which. are each ad
The invention consists in a marine propulsion unit 20 justable as to length, and angle and by which the frame 9
comprising an internal combustion engine, a propeller
is held rigidly in the craft.
and driving means between the engine and the propeller
The drive between the engine 1 and the propeller i5
characterised in that the driving means is of inverted-J
is by way of V belts, not shown, from a V grooved pulley
shape with the propeller at the end of the long limb and
16 on the crankshaft of the engine to a V grooved pulley
the engine at the end of the short limb thereof, and in 25 17 on a horizontal shaft 18 journalled in a bearing be
that support means is provided upon the unit for mount
tween the side plates and protruding from the forward,
ing the engine inboard of the stern of a craft with the
neutral and reversing gear box 19 on the upper end of
propeller submerged and with the driving means positioned
the vertical drive casing 4 . Change of direction is e?ected
over the stern.
by means of the lever 20.
to enable the boat to ride over underwater obstructions
The invention further consists in a propulsion unit as 30
set forth in the preceding paragraph in which the support
means comprises trunnions on or close to the engine upon
which the unit may be pivoted about a horizontal axis
below the gunwale of the stern so as to raise the propeller
The side plates and 3 converge towards the rear of
the unit and are fastened to the gear box 19 and the ver
tical casing 4- and also support the fuel tank 21 and
silencer 22. Further support for the horizontal shaft 18
is provided by the cross member 23 between the side
in the water.
plates.
The invention still further consists in a propulsion unit
as set forth in the preceding paragraph in which the
trunnions are pivotally located in a support frame adapted
to be ?xedly secured in the craft.
Such construction can readily be arranged in barges,
lighters, dinghies or like craft with the shorter limb and
engine within the craft and the mounting extending over
the gunwale thereof so that the propeller is disposed out
The lower end of the vertical casing, which constitutes
the longer limb of the inverted-J shape is terminated by
a bevel gear housing 24 which provides a journal for the
board of the craft.
The mounting of the propulsion unit preferably in
cludes trunnions on the short limb thereof, these trunnions
being pivotally located in a support frame adapted to be
?xedly secured in a craft, so as to provide‘ a substantially
horizontal pivotal axis for the unit, so that the latter
can swing e.g. against the action of a shock absorber,
dashpot or the like, so as, in use, to permit the propeller
to ride over obstructions.
propeller l5 rotatable through the bevel gears by means
of a transmission shaft in the vertical housing.
Seeing that the forward, neutral and reverse gearing
is used at the top of the vertical housing and not in the
water, the lower housing need be only large enough to
contain the bevel gearing and thus provide minimum ob
struction to its passage through the water.
Between the upper and lower gear housings there is
provided a substantially vertical rod 25 having a tiller
26 at the upper end by means of which the rudder 27
may be pivoted about its upper and lower bearings 28
and 29.
A friction or dashpot type of shock absorber or other
resilient connection is provided between the unit and its
support frame to prevent the return of the former to its
The longer limb of the mounting is preferably of tubu
lar form, enclosing a transmission shaft by which the
operative position too quickly, when required and thus
propeller is driven through bevel or like gears, and such 55 prevent damage to the unit or craft.
transmission shaft is preferably driven from a substan
tially horizontal drive shaft extending between the long
As can be seen from the drawing the unit is mounted
in a craft by its supporting frame with the engine disposed
inboard of the craft with the connecting part of the
and short limbs.
Such drive shaft may be driven through V belts and
mounting and the horizontal shaft extending substantially
pulleys or sprocket wheels and chain, as such arrange 60 horizontally above the gunwale of the stern, so that the
ment provides for extremely simple removal and replace
longer limb of the mounting extends downwards out
ment of the engine.
board of the craft and when the latter is a?oat the pro
The accompanying drawing shows by way of example
peller and rudder are below water lever.
only one embodiment of the invention in which:
The propulsion unit is operated in substantially con
‘FIGURE 1 is a side elevation of the propulsion unit,
ventional manner and constitutes effectively a cross be
FIGURE 2 is an end elevation of the unit, while
tween an inboard arrangement and an outboard mounted
FIGURE 3 is a plan view of the unit.
engine, since the engine is disposed inboard, but there
The propulsion unit comprises an internal combustion
is no propeller shaft extending through the boat hull,
engine '11 supported in a cradle-like structure comprising
the drive to the propeller passing through a substantially
side plates 2 and 3 which are U-shaped and which to 70 vertical transmission shaft disposed outboard of the craft.
gether with the vertical drive casing 4 form an inverted J.
The arrangement is extremely compact and is simple to
These side plates are turned inwards below at 5 and 6 and
assemble into a barge or lighter, dinghy or like craft with
3,070,080
out any need for modi?cation of the craft. The mount
ing of the engine in a cradle and the provision of a
belt drive between the engine and the drive shaft makes
it an extremely simple matter to remove the engine, this
being done simply by releasing the engine from its mount
-ing and lifting it out of the latter.
The engine can be provided with a self-starter electric
motor and for this purpose the pulley wheel on the hori
zontal drive shaft is made hollow and in the form of the
rotor of an electric starter motor containing rotor and
stator, and the stator, the electric wiring and connections
are upon the support frame and transmission part of the
casing of the unit and the engine can be removed with the
rotor for maintenance or repair without the need of dis
connecting the stator.
ft is also within the scope of the invention to arrange
for the vertically positioned tubular casing 4 to be ro
tatable about its longitudinal axis for the purpose of
steering and possibly reversing.
A standard mounting can be provided for a variety of
sizes of engine, and the drive ratio of the propeller ac
of gravity of the unit in order that the propeller shall be
urged to remain submerged under the action of gravity.
6. Marine propulsion unit as claimed in claim 1 in
which the long limb of the .J is a normally vertically
positioned tubular casing enclosing a transmission shaft
by which the propeller is driven by way of bevel gears,
while the horizontal part of the J comprises a casing
enclosing 'a reversing gear and a horizontal drive shaft.
7. Marine propulsion unit as claimed in claim 6 in
which the horizontal drive shaft is provided with a V
grooved pulley or toothed sprocket wheel and the short
limb includes a belt or chain drive between the engine
and the pulley or wheel.
8. Marine propulsion unit-as claimed in claim 6 in
which the engine is removably mounted in a cradle at
tached to'the said casings.
9. Marine propulsion unit as claimed in claim 7 in
which the V grooved pulley is hollow and contains an
electric starter motor.
10. Marine propulsion unit as claimed in claim 1 pro
cording to the size of the engine can be provided for
vided with a pair of adjustable horizontal struts upon the
support means adapted to be secured to the stern of a
simply by use of appropriately sized pulleys.
craft.
A further advantage of the invention resides in the
fact that the whole propulsion unit can be removed from
the craft by releasing the supporting frame.
It is to be understood that the above description is by
way of example only and that details for carrying the
invention into effect may be varied without departing
from the scope of the invention claimed.
I claim:
1. A marine propulsion unit comprising an internal
combustion engine, a propeller, driving means connected
between said engine and propeller, said driving means
being of an inverted J shape with the propeller mounted
at the end of the long limb of the inverted J-shaped
driving means for submersion in water, and with the
engine mounted at the end of the short limb thereof in a
manner to project below and inboard of the gunwale of
11. Marine propulson unit as claimed in claim 6 in
which the vertically positioned tubular casing is rotatable
about its longitudinal axis to steer the craft.
12. A marine propulsion unit comprising an internal
combusion engine, a propeller, driving means connecting
said engine to said propeller, said driving means being of
an inverted J shape with the propeller mounted at the
end» of‘ the long limb of the inverted J-shaped driving
means for submersion in Water, with the inverted J-shaped
driving means adapted to be positioned with the roof of
the J astride the gunwale, and with the engine mounted
to the end of the short limb of the inverted J-shaped driv
ing means in a manner to project below the gunwale of
the stern of a marine craft and within the marine craft,
and supporting means for mounting said unit to the stern
of a marine craft.
13. A marine propulsion unit comprising an internal
the stern of a marine craft, support means for attachment 40
combustion engine, a propeller, driving means connecting
to the stern of a marine craft, said support means com—
prising trunnions pivotally connecting said engine to said
support means below and inboard of the gunwale of the
stern of a marine craft, and said engine being disposed
closely adjacent said trunnions whereby said engine may
pivot about an axis below and inboard of the gunwale of
a marine craft to raise the connecting propeller upward
out of the water.
2. 'A marine propulsion unit according to claim 1, in
which said support means further comprises a support
frame adapted to be ?xedly mounted within a marine
craft adjacent the stern thereof, and said trunnions are
pivotally mounted to said support means.
3. Marine propulsion unit as claimed in claim 1 in
which the trunnions are pivotally located in a support "
frame adapted to be ?xedly secured in the craft.
4. Marine propulsion unit as claimed in claim 1 in
which a shock absorber is provided between the unit and
a support frame to allow free movement of the propeller
when raised and controlled movement when lowered in
the water.
5. Marine propulsion unit as claimed in claim 1 in
which the trunnions are positioned forward of the centre
said engine to said propeller, said driving means being of
an inverted J shape with the propeller mounted at the end
of the long limb of the inverted J-shaped driving means for
submersion in the water, and with the engine mounted
at the end of the short limb thereof, support means for
said unit, and trunnion means pivotally connecting said
engine to said support means, said support means being
adapted to be attached to the stern of a marine craft
with the trunnion means being disposed below and to
the gunwale of a craft and within the said craft to provide
a horizontal axis for pivoting said unit about said trun
nion means at an axis below the gunwale for raising and
lowering the propeller in and out of the water.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,482,196
Ketring ______________ __ Jan. 29, 1924
2,217,903
Groves _______ __, _____ __ Oct. 15, 1940‘
2,722,193
Brindley ______________ __ Nov. 1, 1955
FOREIGN PATENTS
115,842
Germany ____________ __ June 28, 1899
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