U.S. patent number 3,802,377 [Application Number 05/363,410] was granted by the patent office on 1974-04-09 for lower unit weed guard.
Invention is credited to Theodore J. Adams, Stephen G. Porter.
United States Patent |
3,802,377 |
Porter , et al. |
April 9, 1974 |
LOWER UNIT WEED GUARD
Abstract
A truncated cone-shaped hollow body is provided and includes a
plurality of axially spaced circumferential rows of openings formed
therethrough. The body is further provided with a longitudinal slot
extending along one slant height zone thereof and opening through
the major diameter end of the body. The small diameter end of the
body includes an integral endwise outwardly projecting cylindrical
sleeve portion for snugly telescoping over the forward end portion
of the lower horizontal cylindrical motor housing of an electric
trolling motor and a clamp is provided for clamping the cylindrical
extension to the motor housing. The slot is provided to receive the
lower end of the depending support shaft portion of the electric
trolling motor as the body is telescoped over the forward end of
the motor housing and the side of the body remote from the first
mentioned slot includes a second longitudinal slot closed at its
opposite end and provided to receive the depending skeg portion of
the trolling motor which extends longitudinally of the motor
housing and projects downwardly therefrom.
Inventors: |
Porter; Stephen G. (Fort
Lauderdale, FL), Adams; Theodore J. (Fort Lauderdale,
FL) |
Family
ID: |
23430093 |
Appl.
No.: |
05/363,410 |
Filed: |
May 24, 1973 |
Current U.S.
Class: |
440/72 |
Current CPC
Class: |
B63H
5/165 (20130101) |
Current International
Class: |
B63H
5/00 (20060101); B63H 5/16 (20060101); B63h
001/14 () |
Field of
Search: |
;115/6.1,17,18E,42,70 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Reger; Duane A.
Assistant Examiner: Sotelo; Jesus D.
Attorney, Agent or Firm: O'Brien; Clarence A. Jacobson;
Harvey B.
Claims
What is claimed as new is as follows:
1. In combination with an outboard motor of the type including a
depending support portion provided with a horizontally elongated
marine propeller drive housing at its lower end portion, said
housing including a front-to-rear extending shaft journalled
therein having a marine propeller mounted on its rear end, a weed
guard comprising a hollow generally horizontal truncated
cone-shaped body provided with axially and circumferentially spaced
water passages formed therethrough, said body being constructed of
light weight, stiff but somewhat flexible material, the minor
diameter end of said body including an endwise outwardly projecting
cylindrical extension snugly telescopingly engaged over the forward
end of said housing and disposed forward of said support portion,
said extension including means clamping said extension about said
housing with the center axis of said body at least generally
coinciding with the center axis of said housing and the major
diameter end of said body loosely enclosing said marine propeller,
the upper marginal portion of said body having a longitudinal slot
formed therein opening rearwardly through the major diameter end of
said body and closed at its forward end adjacent said extension,
said slot being operable to receive the lower end of said depending
support portion therethrough.
2. The combination of claim 1 wherein said cylindrical extension is
uninterrupted about its circumference.
3. The combination of claim 1 wherein the material of which said
body is constructed is at least slightly compressible, said means
clamping said extension about said housing comprising a compression
type clamp member extending about said extension and clamping the
extension to said housing.
4. The combination of claim 1 wherein said housing includes a
depending front-to-rear extending blade-type skeg on its lower
portion, said body having a second longitudinally extending closed
ended slot formed in its lower portion through which said skeg
extends.
5. The combination of claim 1 wherein said body includes
longitudinally spaced circumferentially extending bands disposed in
parallel planes normal to the center axis of said body and which
intersect with circumferentially spaced slant height zones of said
body, said openings being formed in the areas between adjacent
bands intersecting with adjacent zones.
6. The combination of claim 1 wherein said openings are at least
slightly elongated along said slant height zones.
7. The combination of claim 1 wherein the minor diameter end of
said body is of substantially the same inside and outside diameter
as the inside and outside diameters of said extension.
8. The combination of claim 1 wherein the inside and outside
diameters of said extension are less than the inside and outside
diameters of the minor diameter end of said body and the rear end
portion of said extension is joined to the minor diameter end of
said body by means of an annular partial front wall whose outer
periphery is formed integrally with the minor diameter end of said
body and whose inner periphery is formed integrally with said
extension.
9. The combination of claim 1 wherein the inner forward end of said
slot is transversely enlarged.
Description
Electric trolling motors are becoming increasingly popular and are
utilized in shoal waters in which weeds are many times present in
abundance. Many electric trolling motor units are operated by a
remote control toe-heel foot pedal to control steerage of the
electric motor and quick steerage may be accomplished through the
utilization of the toe-heel foot pedal control. However, when
operating an electric trolling motor in shoal waters in which weeds
are present the propeller of the trolling motor may quite often
become entangled with weeds. The entanglement of weeds about the
propeller of an electric trolling unit not only reduces the
efficiency of the trolling motor as a propulsion force but also
increases the resistance of the water on the trolling motor during
steering operations and quick and precise control through the
utilization of the conventional toe-heel foot pedal control is
greatly hindered.
The weed guard of the instant invention has been specifically
designed for utilization on at least the several more popular
electric trolling motors and is provided to prevent weeds from
becoming entangled with the propeller of these trolling motors. The
guard has been specificially designed to be effective as a weed
guard, to offer minimum resistance during steering operations and
to add very little weight to the lower end of the electric trolling
unit whereby tilting of the unit will not be rendered more
difficult.
The main object of this invention is to provide a means for
guarding the propeller of an electric trolling motor against having
weeds in the ambient water becoming entangled with the
propeller.
Another object of this invention is to provide a guard which will
be of light weight construction so as to add very little weight to
the lower end portion of the electric trolling motor.
Another important object of this invention is to provide an
electric trolling motor propeller guard which will offer little
resistance to sideways movement through the water in order that
precise steering control of the electric trolling motor may be
maintained through the utilization of a conventional toe-heel foot
pedal control.
Another very important object of this invention is to provide a
guard for an electric motor in accordance with the preceding
objects and constructed in a manner whereby the guard may be
utilized on motors of several different manufacture.
A final object of this invention to be specifically enumerated
herein is to provide a propeller guard 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 herinafter described and claimed, reference
being had to the accompanying drawings forming a part hereof,
wherein like numerals refer to like parts throughout.
FIG. 1 is a perspective view of the propeller guard of the instant
invention;
FIG. 2 is a front elevational view of the propeller guard on
somewhat of an enlarged scale;
FIG. 3 is a side elevational view of the propeller guard as seen
from the right side of FIG. 2;
FIG. 4 is a side elevational view of the propeller guard as mounted
on the motor housing of an electric trolling motor, the guard being
illustrated in longitudinal vertical section; and
FIG. 5 is a fragmentary longitudinal vertical sectional view of the
forward end portion of a modified form of propeller guard adapted
for use in conjunction with an electric motor housing of smaller
diameter than the electric motor housing illustrated in FIG. 4.
Referring now more specifically to the drawings, the numeral 10
generally designates the propeller guard of the instant invention.
The guard 10 includes a hollow truncated cone-shaped body referred
to in general by the reference numeral 12 and including a
cylindrical extension 14 projecting endwise outwardly from the
minor diameter end of the body 12. The body 12 is provided with
longitudinally spaced rows of circumferentially extending openings
16 which are defined between longitudinally spaced
circumferentially extending band portions 18 of the body
intersecting with circumferentially spaced slant height zones 20 of
the body 12. The openings 16 are defined in the spaces between
adjacent pairs of intersecting band portions 18 and zones 20, the
openings 16 being slightly elongated longitudinally of the body
12.
The upper peripheral portion of the body 12 includes a
longitudinally extending slot 22 which opens through the major
diameter end of the body 12 and is closed at its forward end
adjacent the extension 14. Further, the forward end of the slot 22
is transversely enlarged as at 24.
With attention now invited more specifically to FIG. 4 of the
drawings, there will be seen the rear portion of a fishing boat 26
from which a conventional form of electric trolling motor referred
to in general by the reference numeral 28 is supported. The
trolling motor 28 includes a depending support shaft or portion 30
and a horizontally elongated front-to-rear extending electric motor
housing 32 supported from the lower end of the depending support
portion 30. The electric motor housing 32 encloses an electric
motor (not shown) including a front-to-rear extending rotary output
shaft 34 upon which a marine propeller 36 is mounted. The propeller
36 is disposed at the rear end of the housing 32 and the latter
also includes a depending longitudinally extending skeg 38.
The body 12 is constructed of stiff but bendable and somewhat
resilient material such as plastic. The guard 10 is installed on
the electric motor housing 32 by rearwardly displacing the guard 10
over the front end of the housing 32 after the slot 22 has been
widened sufficiently to receive the lower end of the depending
support portion 30. In addition, the guard 10 includes a
longitudinal slot 40 along its under periphery and the slot 40 is
closed at its opposite ends and receives the skeg 38 therethrough
as the guard 10 is moved into the position illustrated in FIG. 4.
Thereafter, with the lower end of the support portion 30 disposed
in the transversely enlarged portion 24 of the slot 22, a clamping
band 42 is tightened about the extension 14 so as to securely clamp
the latter about the forward end of the electric motor housing 32
with the propeller 36 received within the confines of the rear
major diameter end portion of the body 12.
It is to be understood that the body 12 will be formed by
conventional molding processes and if the electric motor housing 32
is of a smaller diameter than that illustrated in FIg. 4 of the
drawings, a sleeve will be placed in the mold in which the guard 10
is formed so as to form a reduced diameter extension such as that
designated by the reference numeral 14' in FIG. 5 and which is
formed integrally with the body 12 and supported from the latter by
means of an annular partial front wall 15 extending between the
rear end of the extension 14' and the forward end of the body
12.
If the guard 10 is to be used in conjunction with a trolling motor
whose support portion 30 is positioned more closely adjacent the
longitudinal center of the electric motor housing 32, the portion
of the slot 22 to be registered with the lower end of the support
portion 30 may be transversely enlarged by using a suitable cutting
instrument. However, in all instances the propeller 36 will be at
least slightly spaced forward of the major diameter end of the body
12 so as to be fully enclosed within the guard 10.
The plastic material of which the body 12 is constructed will be
sufficiently stiff and resilient to retain its shape and yet the
body 12 will be able to yield under impact with a submerged object.
Further, the slightly longitudinally elongated openings 16 provide
ample passage for water from the exterior of the body 12 into the
area confined within the body 12 forward of the propeller 36 for
subsequent acting upon by the propeller. Further, the openings 16
are sufficiently longitudinally elongated to reduce the resistance
of side swinging of the gurad 10 through the water during steering
movements. Thus, the trolling motor 28 may still be readily
controlled by the conventional remote toe-heel foot pedal
control.
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.
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