U.S. patent number 3,580,212 [Application Number 04/882,189] was granted by the patent office on 1971-05-25 for control and mounting system for electric trolling motor.
Invention is credited to Warren D. Fortson.
United States Patent |
3,580,212 |
Fortson |
May 25, 1971 |
CONTROL AND MOUNTING SYSTEM FOR ELECTRIC TROLLING MOTOR
Abstract
An electric outboard motor assembly and storage housing therefor
including remotely disposed power and steering controls. The
storage housing is constructed in a manner whereby a battery for
the electric outboard motor assembly may be received therein and a
voltage control is mounted on the housing and operatively connected
to the battery and electric motor of the outboard motor assembly
for controlling the speed of operation of the electric motor.
Further, the steering control for the electric outboard motor
assembly includes a pair of selectively usable steering components,
one of which is removably supported from the housing and receivable
in the latter for storing and the other of which is mountable
directly on the outboard motor assembly and is also receivable in
the housing for storage. In addition, the second mentioned steering
control is provided with its own voltage control whereby one hand
operation of the electric outboard motor assembly may be
accomplished when the motor is being steered by the second
mentioned steering control.
Inventors: |
Fortson; Warren D. (Sturgis,
MS) |
Family
ID: |
25380078 |
Appl.
No.: |
04/882,189 |
Filed: |
December 4, 1969 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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771766 |
Oct 30, 1968 |
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Current U.S.
Class: |
440/6; 440/62;
440/7 |
Current CPC
Class: |
B63H
20/007 (20130101) |
Current International
Class: |
B63H
20/00 (20060101); B63h 021/26 () |
Field of
Search: |
;115/34,18,18 (E)/
;115/38 ;114/144,145,153,157 ;74/494,515 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Buchler; Milton
Assistant Examiner: Rutledge; Carl A.
Parent Case Text
This application is a continuation-in-part of my copending U.S.
Pat. application Ser. No. 771,766, filed Oct. 30, 1968, for
"Control System for Trolling Motor."
Claims
I claim:
1. In combination with a housing from which a horizontally disposed
driven propeller shaft is journaled and including an upstanding
support standard having a mounting bracket journaled on its upper
end for rotation about an axis generally paralleling the standard
and adapted for support from the gunwale of a boat with the support
standard disposed outwardly of the boat, remotely operable means
operatively connected between said standard and mounting bracket
for adjustably rotating the standard relative to the bracket, said
mounting bracket including a first portion for securement to said
gunwale and a second portion supported from said first portion for
rotation about a horizontal axis and from which the upper end of
said support standard is journaled, said first and second portions
including first coacting means establishing a limit position of
swinging of said second portion relative to said first portion in
one direction, said first portion and said standard including
second coacting means operative to lock said standard, and thus
said second portion, against swinging from said limit position
about said horizontal axis in the other direction when the standard
is rotated relative to said second portion to a position between a
first and second relatively angularly displaced position.
2. In combination, a mount, a shaft supported from said mount for
oscillation about the longitudinal axis of said shaft, a drive for
oscillating said shaft, said mount including a first portion for
securement to a boat gunwale and a second portion supported from
said first portion for oscillation about a horizontal axis
extending transversely of said shaft and from which the upper end
of said shaft is oscillatably supported, said drive including means
supported from said shaft and defining a generally radially
outwardly opening generally circular groove concentric with said
axis, a Bowden cable assembly including an elongated flexible cable
core including a midportion having at least one full convolution
formed therein seated in said groove, and a pair of axially spaced
outer sleeve portions including adjacent ends stationarily
supported from said second portion of said mount and with which the
opposite end portions of said core are guidingly engaged for
longitudinal shifting relative thereto.
3. The combination of claim 2 wherein said groove includes a
portion thereof of increased dimension, said one convolution having
an enlargement thereon seated in said portion of increased
dimension.
4. In combination, a base adapted for support from a peripheral
portion of the hull of a boat, a horizontally laterally opening
slotted support journal, a mounting sleeve, a support shaft
rotatable in said sleeve, said sleeve including a horizontal pivot
shaft portion supported laterally outwardly of one side of said
sleeve removably journaled in said slotted journal, said sleeve and
base including coacting means defining a limit position of pivotal
movement of said sleeve relative to said base in one direction and
said shaft and base including coacting means operative to
selectively prevent pivotal movement of said sleeve in the other
direction from said limit position in response to rotation of said
shaft relative to said sleeve between relatively angularly
displaced positions of said shaft.
5. The combination of claim 4 wherein the slot in said support
journal extends longitudinally thereof and is of a width at least
slightly less than the inside diameter of said support journal,
said support shaft including at least one flattened side thereof,
the distance between said flattened side and the remote side of
said shaft being at least slightly less than the width of said
slot.
6. A steering and electric motor control for an electric outboard
motor, said control including a generally horizontal control arm,
means supporting one end of said control arm for oscillation about
an upstanding axis, the other end of said arm defining a
horizontally disposed yoke opening endwise outwardly of said other
end and adapted to receive the knee of an operator of said control
therein, the closed end of said yoke including an electric control
switch having a movable actuator projecting generally centrally
into the knee receiving area defined by said yoke from the closed
end of the latter and engageable by said knee for actuation of said
switch.
7. The combination of claim 6 wherein said control arm includes
means defining a pair of motion transmitting arms supported for
oscillation with said yoke and including free ends disposed on
opposite sides of said axis, said control including a bowden cable
assembly whose core ends are attached to said free ends.
8. The combination of claim 7 wherein the midportion of said cable
assembly is free of an outer casing and the exposed midportion of
the core has a convolution formed therein, and a sleeve portion
about which said convolution is lightly wound and adapted to be
secured to a rotatable upright support shaft for rotation
therewith.
9. The combination of claim 8 including a mount, said shaft being
supported from said mount for oscillation about the longitudinal
axis of said shaft, a drive for oscillating said shaft, said drive
including means supported from said shaft and defining a generally
radially outwardly opening generally circular groove concentric
with said axis, an elongated flexible cable core including a
midportion having at least one full convolution formed therein
seated in said groove, and guide means stationarily supported from
said mount with which the opposite end portions of said core are
guidingly engaged for longitudinal shifting relative to said guide
means.
10. The combination of claim 8 including a base adapted for support
from a peripheral portion of a boat hull, a support journal
pivotally supported from said base for oscillation about a
horizontal axis extending transversely of said sleeve, said support
shaft being rotatable in said sleeve, said sleeve and base
including coacting means defining a limit position of pivotal
movement of said sleeve relative to said base in one direction and
said shaft and base including coacting means operative to
selectively prevent pivotal movement of said sleeve in the other
direction from said limit position in response to rotation of said
shaft relative to said sleeve between relatively angularly
displaced positions of said shaft.
11. The combination of claim 8, including a base adapted for
support from a peripheral portion of the hull of a boat, a
horizontally laterally opening slotted support journal, a mounting
sleeve, said support shaft being rotatable in said sleeve, said
sleeve including a horizontal pivot shaft portion supported
laterally outwardly of one side of said sleeve removably journaled
in said slotted journal.
12. The combination of claim 11 wherein one end of said shaft
includes an electric motor and propeller assembly.
13. The combination of claim 11 wherein said sleeve and base
include coacting means defining a limit position of pivotal
movement of said sleeve relative to said base in one direction and
said shaft and base include coacting means operative to selectively
prevent pivotal movement of said sleeve in the other direction from
said limit position in response to rotation of said shaft relative
to said sleeve between relatively angularly displaced positions of
said shaft.
Description
The control system of the instant invention is primarily designed
for use by fishermen in that it includes a storage housing in which
the associated electric outboard motor may be stored. In addition,
the support structure by which the outboard motor is to be
supported from a boat may also be stored within the housing in
addition to a storage battery and selectively usable voltage and
steering control assemblies. Also, flexible conductor means and
motion transmitting means are provided for operatively connecting
the outboard motor to the remotely operable steering and voltage
controls.
Movable control actuator portions of the voltage control and
steering control are supported from the housing in unique relation
relative to each other whereby both may be operated simultaneously
by a single limb of the operator. The voltage control includes a
pushbutton on-off switch and the steering control actuator portion
includes a horizontally swingable and knee engageable bifurcated
arm between whose furcations the pushbutton-type on-and-off switch
is located. The on-and-off switch is not only connected to one
terminal of the associated battery but also to the electric motor
of the outboard motor assembly through a voltage control assembly,
the electric motor also being connected to the second terminal of
the battery. In this way, the voltage control, mounted on the
housing, may be set to operate the motor at the desired speed and
starting and stopping of the motor as well as steering of the motor
may be effected by one knee of the operator of the outboard
motor.
A second set of movable control actuator portions of the voltage
control and the steering control are supported from atop the
vertical support and pivot shaft of the outboard motor to define a
horizontally outwardly projecting handle. The handle may of course
be swung so as to effect steerage of the outboard motor assembly
and the free end of the handle is provided with a pushbutton-type
on-off switch for starting and stopping operation of the electric
motor through the aforementioned voltage control mounted on the
storage housing.
The main object of this invention is to provide a control system
for an electric trolling motor including a storage housing which
may be readily handled and transported from one location to another
and which is capable of containing substantially all portions of
the outboard motor and its steering and voltage controls as well as
a source of electrical potential for the outboard motor.
Another object of this invention is to provide a novel voltage
control and steering control assembly whereby each control may be
simultaneously actuated by a single limb of the operator of the
electric outboard motor.
A still further object of this invention, in accordance with the
immediately preceding object, is to provide a pair of alternately
usable voltage control and steering control assemblies with a first
pair of the assemblies being adapted for actuation in a location
remote from the associated outboard motor and the second pair of
assemblies being supported directly from the outboard motor.
Yet another object of this invention is to provide an improved
mounting for supporting an electric outboard motor from any gunwale
or transom portion of an associated boat in a manner such that the
outboard motor may be readily swiveled about an upstanding axis and
also about a horizontal axis for tilting up out of the water should
an underwater obstacle be contacted.
Another important object of this invention, in accordance with the
immediately preceding object, is to provide means whereby upward
swinging or tilting of the motor and propeller assembly of the
outboard motor effected by the thrust developed by the propeller
turning in water may be prevented in selected quadrants of rotation
of the outboard motor about its vertical steering axis.
A final object of this invention to be specifically enumerated
herein is to provide a control system for an electric trolling
motor which will conform to conventional forms of manufacture, be
of simple construction and easy to use so as to provide a device
that will be economically feasible, long lasting and relatively
trouble free in operation.
These together with other objects and advantages which will become
subsequently apparent reside in the details of construction and
operation as more fully hereinafter described and claimed,
reference being had to the accompanying drawings forming a part
hereof, wherein like numerals refer to like parts throughout, and
in which:
FIG. 1 is a fragmentary top plan view of the forward portion of a
fishing boat with the control assembly of the instant invention
selectively positioned adjacent a first seat structure for
actuation by an operator seated upon a second seat structure (not
shown) and the motor mount portion of the assembly operatively
supporting the associated electric outboard motor from the forward
portion of the starboard gunwale of the boat;
FIG. 2 is a fragmentary side elevational view of the forward end of
the boat illustrated in FIG. 1 as seen from the starboard side
thereof and with an alternate upwardly swung position of the motor
and propeller assembly illustrated in phantom lines;
FIG. 3 is a fragmentary enlarged vertical sectional view taken
substantially upon the plane indicated by the section line 3-3 of
FIG. 2;
FIG. 4 is an exploded perspective view of the outboard motor
mounted portion of the mounting and remote steering control
assemblies of the instant invention;
FIG. 5 is a fragmentary perspective view of the remotely disposed
actuator portions for the steering and voltage controlling
assemblies;
FIG. 6 is a top plan view of the storage housing of the instant
invention with the top thereof removed and with various portions of
the outboard motor assembly positioned within the storage
housing;
FIG. 7 is a perspective view of the storage housing with the cover
or top wall thereof in place;
FIG. 8 is a fragmentary top plan view of a motor pivot shaft
mounted steering and voltage control assembly of the outboard
motor; and
FIG. 9 is a fragmentary enlarged rear elevational view of the
assemblage illustrated in FIG. 8 with portions of the motor
mounting assembly and gunwale portions of the boat being broken
away and illustrated in vertical section.
Referring now more specifically to the drawings the numeral 10
generally designates a small fishing boat or skiff including a
starboard gunwale 12, a transverse seat 14 and a floor or bottom
16.
The control system of the instant invention is generally referred
to by the reference numeral 18 and is adapted to be utilized in
conjunction with an outboard motor referred to in general by the
reference numeral 20 including a lower motor and propeller unit 22
carried by the lower end of a tubular support shaft 24 including a
female plug 26 at its upper end and conductor means 28 electrically
connecting the female plug socket 26 to the motor and propeller
unit 22.
The control system 18 includes a mounting assembly referred to in
general by the reference numeral 30 and the assembly 30 includes a
U-shaped channel member 32 for disposition in inverted position
over the gunwale 12 and having a pair of clamp screws 34 threadedly
engaged with one flange 36 of the channel member 32. A horizontal
extension flange 38 is carried by the outer side of the channel
member 32 and has a rearwardly opening notch 40 formed therein with
which the upper end of a depending rearwardly opening channel
member 42 is registered. The channel member 42 is secured to the
undersurface of the extension flange 38 and a longitudinally
slotted journal sleeve 44 is secured to the upper surface of the
extension flange 38 forward of the forward extremity of the notch
40.
The mounting assembly 30 includes a second portion referred to in
general by the reference numeral 46 comprising an elongated
upstanding mounting block 48 having an upstanding bore (not shown)
formed therethrough and a sleeve bearing 50 is received downwardly
in the bore formed in the mounting block 48 and includes a collar
52 on its upper end which overlies the upper surface 54 of the
block 48.
The tubular support shaft 24 includes a lower end portion which
curves rearwardly as at 56 and terminates in a rearwardly directed
horizontal portion 58. The horizontal portion 58 is disposed below
the path of movement of the marine propeller 60 of the motor and
propeller unit 22 and thereby acts as a skeg to prevent the
propeller 60 from striking a submerged object in shallow water. The
motor and propeller unit 22 is supported on the lower end of the
shaft 24 by means of a mounting clamp 62 and the structure of the
mounting clamp 62 and unit 22 is such that the front end of the
unit 22 forms a watertight seal with the shaft 24 to shield the
conductor means 28 from the water where the conductor means 28 pass
from the tubular support shaft 24 into the unit 22.
The upper end of the tubular support shaft 24 is rotatably received
through the sleeve bearing 50 and a split clamp collar 66 is
clamped about the upper end of the tubular support shaft 24 above
the collar 52 with the undersurface of the split clamp collar 66
resting upon the collar 52. The split clamp collar 66 includes a
tightening screw 68 by which the clamp collar 66 may be tightened
or loosened on the tubular support shaft 24 and the collar 66
further includes a lower circumferential groove 70 including a
widened portion 72 of increased depth.
The mounting block 48 includes a pair of opposite side forwardly
projecting horizontal arms 74 between whose free ends a rod 76 is
secured by means of fasteners 78. The rod 76 is flattened along one
side as at 76' and receivable in the slotted journal 44 which
includes a narrow throat opening 44'. It may therefore be seen that
the second portion 46 of the mounting assembly 30 is removably
oscillatably supported from the extension flange 38 by means of the
rod 76 and the split journal 44.
A tilt lock collar 80 including a setscrew 82 is snugly disposed
and rotatable on the upper end of the tubular support shaft 24
immediately beneath the mounting block 48. The setscrew 82 is
utilized to secure the collar 80 in vertically and angularly
adjusted positions on the support shaft 24 and it may be seen from
FIG. 2--4 of the drawings that the lower marginal edge portions of
the forward wall 84 of the depending channel member 42 includes a
downwardly projecting and rearwardly inclined stop finger or lug
86. The collar 80 includes an upper end counterbore 88 and one half
of the upper end portion of the sleeve 80 defining the counterbore
88 is cutaway as at 90.
With attention now invited more specifically to FIGS. 2 and 3 of
the drawings, it will be noted that when the propeller and motor
assembly 22 projects rearwardly from the lower end of the tubular
support shaft 24, the cutaway portion of the upper end of the
collar 80 is registered with the finger or lug 86 whereby the lower
end of the tubular support shaft 24 is free to swing rearwardly and
upwardly should the rearwardly curving lower end portion of the
motor support shaft 24 strike a submerged object. However, should
the tubular support shaft 24 be rotated 180.degree. for operation
of the boat 10 in reverse, the finger or lug 86 is received within
the counterbore 88 so as to prevent the thrust developed by the
motor and propeller assembly 22 from swinging the lower end of the
tubular support shaft 24 to the dotted line position thereof
illustrated in FIG. 2 of the drawings as the boat 10 is operated in
reverse. Of course, the forward side 92 of the mounting block 48
seats against the rear face of the forward wall 84 to prevent
forward and upward swinging of the lower end of the tubular support
shaft 24 when the motor and propeller assembly 22 is positioned as
illustrated in FIG. 2 of the drawings for forward propulsion of the
boat 10.
The upper end of the block 48 includes an inwardly projecting
mounting arm portion 94 including an upwardly projecting threaded
thumbscrew 96 on its free end portion and a longitudinally
shiftable slotted slide plate 98 on its inner end portion to be
held in place by means of a threaded fastener 100 which may be
tightened to clamp the plate 98 in position relative to the
mounting arm portion 94.
The control system 18 includes a bowden cable assembly referred to
in general by the reference numeral 102 consisting of a pair of
outer flexible housings 104 and 106 and a single inner flexible
core 108. The midportion of the core 108 has almost two
convolutions 110 formed therein and is seated in the groove 70. One
of the convolutions is provided with an enlargement or abutment 112
which is seated in the widened portion 72 of the groove 70 and the
end portions of the core 108 adjacent the convolutions 110 are
slidingly received through opposite side tube portions 114 defined
by integral downwardly and inwardly curled opposite side portions
of a mounting plate 116 having a rectangular slot 118 formed
therein.
Corresponding ends of the outer housings 104 and 106 are clampingly
secured in the opposite side rolled or tube portions 114 of the
mounting plate 116 and the mounting plate may be secured to the
mounting arm portion 94 by turning the thumbscrew 96 in alignment
with the longitudinal axis of the mounting arm portion 94, slipping
the mounting plate 116 downwardly on top of the mounting arm
portion 94 with the thumbscrew 96 received through the slot 118 and
the forward edge 120 of the mounting plate 116 abutted up against
the rear edge 122 of the adjustable slide plate 98. Then, the
thumbscrew 96 may be tightened and disposed so as to extend
transversely of the mounting arm portion 94.
Referring now more specifically to FIGS. 6 and 7 of the drawings
there may be seen a housing referred to in general by the reference
numeral 120 and which includes opposite end walls 122 and 124 and
opposite sidewalls 126 and 128. In addition, the housing 120
includes a pair of transverse partitions 130 and 132 as well as a
longitudinal partition 134 extending between the ends of the
partitions 130 and 132 adjacent the sidewall 126. The sidewall 128
has a pair of upwardly opening notches 136 formed therein and the
sidewall 126 has three upwardly opening notches 138 and 140 formed
therein. Further, a bracket 142 is secured to the inner side of the
sidewall 126 beneath the notch 140 by means of suitable fasteners
144 and a voltage control switch 146 is secured to the inner
surface of the sidewall 128 between the partition 132 and the end
wall 124. The voltage control switch 146 includes an actuator
therefor at 148 disposed outwardly of the sidewall 128 and an
exterior mounting plate 150 is mounted on the outer surface of the
sidewall 128 by means of suitable fasteners 152 and includes an
upstanding sleeve portion 154. Finally, a pair of anchor blocks 156
are secured to the inner surface of the sidewall 128 by means of
fasteners 158 and the upper marginal edge portions of the end walls
122 and 124 and the transverse partitions 130 and 132 are provided
with aligned upwardly opening notches 160.
The housing 120 includes a top 162 provided with peripherally
disposed depending opposite side and end flanges 164 and 166 and
the top or cover 162 is receivable over the open upper end of the
housing 120 as seen in FIG. 7 of the drawings with the flanges 164
and 166 telescoped downwardly over the upper ends of the opposite
sidewalls 126 and 128 and opposite end walls 122 and 124.
With attention now invited more specifically to FIG. 5 of the
drawings there may be seen an upstanding control shaft 170
including a laterally directed upper end portion 172 on whose free
end a bifurcated yoke 174 including a pair of spaced legs 176 and
178 is secured. The inner surfaces of the yoke 174 are covered by a
resilient padding 180 and a pushbutton switch 182 is secured to the
upper surface of the free end of the laterally directed portion 172
and includes an extended reciprocal pressure actuator 184 which is
slidingly received through the bight portion 186 of the yoke 174
and has an enlarged head 188 on its free end. Further, a mounting
and abutment sleeve 190 is mounted on the lower end portion of the
control shaft 170 and releasably secured in position thereon by
means of a setscrew 192. The lower end of the shaft 170 projects
below the sleeve or collar 190 and is rotatably journaled in the
sleeve or sleeve portion 154 secured to the mounting plate 150.
The free ends of the flexible core 108 are secured to the free ends
of a pair of diverging arms 194 carried by the sleeve 190 and
slidably received through the notches 136. The ends of the housings
104 and 106 remote from the mounting plate 116 are received through
the notches 138 and secured to the anchor blocks 156 by means of
suitable clamps 196. Thus, oscillation of the shaft 170 by swinging
the yoke 174 from side to side will cause oscillation of the
tubular support shaft 24.
A storage battery 200 is disposed within the housing 120 and
includes a first terminal 202 to which one end of a conductor 204
is connected. The other end of the conductor 204 extends to the
pushbutton switch 182 through an outer covering 206 and a second
conductor 208 extends from the switch 182 through the outer
covering 206 to the voltage control switch 46. A third conductor
210 comprising one conductor of a two conductor extension line
extends from the switch 146 to a male socket 212 while the second
conductor 214 of the extension cord extends from the male socket
212 to the second terminal 216 of the battery 200. Of course, the
male plug 212 is downwardly receivable within the collar 66 for
electrical connection with the female plug 26 and it may be seen
from FIG. 4 of the drawings that the male plug 212 includes a pair
of terminals 218 which are shielded against accidental grounding by
means of a flexible and generally cylindrical sleeve 220. Further,
the plug 212 has an arrow-shaped body 222 secured thereto
indicating the direction of thrust which will be developed by
operation of the motor and propeller unit 22 when the voltage
control switch 146 has its actuator 148 positioned in a "forward"
position. Of course, it is to be noted that the voltage controlling
switch 148 is not only operative to control the amount of voltage
delivered to the motor and propeller unit 22 but also the direction
of flow of electricity thereto whereby the unit 22 may be operated
in opposite directions.
With attention now invited more specifically to FIGS. 8 and 9 of
the drawings there may be seen a direct steering assembly referred
to in general by the reference numeral 226 which may be utilized as
an alternate method of steering the outboard motor and controlling
its operation. The steering assembly 226 defines an elongated
steering handle 228 having a handgrip 230 on one end and a voltage
control switch 232 on its base end corresponding to the voltage
control switch 146. The switch 232 includes an actuator 234 and the
base end of the handle 228 includes a reduced neck portion 236
corresponding to the collar 66 and including a setscrew 238
corresponding to the clamp screw 68. Further, a male plug 240
corresponding to the male plug 212 is disposed within the neck 236
and a pair of conductors 242 and 244 extend from the steering
assembly 226 and correspond to the conductors 204 and 214. In
addition, the steering assembly 226 includes a second pair of
conductors 246 and 248 corresponding to the conductors 208 and 214.
Further, the free end of the handle 228 includes a pushbutton
switch 250 having an actuator 252 and which corresponds to the
switch 182. Accordingly, instead of utilizing the remotely operable
steering assembly of FIGS. 4 and 5, the steering assembly 226 may
be utilized in its stead. However, inasmuch as the steering
assembly 226 may be operated by only one hand of the operator of
the outboard motor and the steering assembly illustrated in FIGS. 4
and 5 may be also operated by only one knee of the operator
received in the yoke 74, both steering assemblies may be controlled
by a single limb of the operator of the outboard motor.
Inasmuch as the mounting plate 116 may be adjusted longitudinally
of the mounting arm portion 94, the tensioning of the flexible core
108 may be adjusted as desired after the convolutions 110 have been
seated in the groove 170. Further, it is to be noted that all of
the various steering components are receivable within the various
components of the housing 120 and that room is also provided in the
housing 120 for a battery charger 260 to be utilized in recharging
the battery 200. The top or cover 262 is provided with a lifting
handle 262 whereby the entire outboard motor assembly including its
various steering controls and battery may be readily carried in one
hand.
The foregoing is considered as illustrative only of the principles
of the invention. Further, since numerous modifications and changes
will readily occur to those skilled in the art, it is not desired
to limit the invention to the exact construction and operation
shown and described, and accordingly all suitable modifications and
equivalents may be resorted to, falling within the scope of the
invention as claimed.
* * * * *