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Патент USA US2404044

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Ju?y i, 1946.
M. FALK
I
- 2,404,044
PROPELLING DEVICE
Filed Aug. 23, 1945
2 Sheets-Sheet l
INVENTOR.
an.
6A
ATTORNEY.
'
uHy E6, 1946.
M. FALK
2,404,044
PROPELLING DEVICE
‘ Filed Aug. 25, 1945
2 Sheets-Sheet 2
/
B
~15
INVENTOR.
7”
ATTORNEY.
Patented July 16, ‘1946/
2,404,044
UNITED STATES
V
'
PATENT OFFICE ‘
2,404,044
I
'
‘
. PRQPELLING DEVICE
‘
Marcus Falk,‘Boston, Mass.
Application August 23, 1945,-Serial No. 612,190
' ‘
l 4 Claims. (01. 170%141)
1 .
This invention relates to a propelling device
for a boat.
One object of my invention is to provide a new
and useful propelling device-one that is pro
tected and guided by the same means during the
2
said guide member l2, propeller body l5 and
bracket 18-, said propeller body rotating on it».
Said scoops iii are outside of but rotate close to
understood, may be accomplished by a construc
the rounded, peripheral surface of said guide
member l2, except when their path of rotation
is below it, opposite said surface l3.
Fixed to said propeller body I5 is a stud 22 on
which a connector head 24 is mounted, to which
head 24 a connecting rod 25 is fastened which
tion and arrangement of parts, such as is dis
10 in turn is actuated by a well known motor or the
major part of its rotative travel.
The foregoing and other objects which will ap
pear as the nature of the invention is better
closed by the drawings and speci?cation.
The
like, not shown, thus driving said propeller H]
nature of the invention is such as to render it
by a crank-like motion which forcibly brings said
susceptible to various changes and modifications,
and, therefore, I am not to be limited to said
disclosure; but am entitled to all such changes
scoops l6 into contact with the water as said
ward.
therefrom as fall within the scope of my claims.
peller I0 is rotated reversely and said back i511
In the drawings:
‘
Figure 1 is a top plan view of my propelling
device attached to a boat, and
body I5 is rotated, thus propelling the boat for
To propel in a reverse direction said pro
pushing against the water will cause a reverse
movement of said boat B.
The number of scoops l6 carried by propeller
Figure 2 is a side elevational view of the same. 20 body [5 may be varied, depending upon the size
Figure 3 is a sectional view taken on the line
of said body IS, the speed desired, et cetera, and
-3—3 of Figure 2 and
Figure 4 is a sectional view taken on the line
4~4 of Figure 2.
Figure 5 is a front elevational view of my de
vice attached to the stern of a boat.
Figure 6 is an enlarged, perspective view of
a propeller scoop or blade showing a fragment of
the propeller body.
likewise their size may be varied.
The width of said guide member l2 at its
rounded periphery, should be at least equal to
‘ the width of a said scoop 16. If said guide mem
her is hollow its lower edge It‘ shouldbe closed.
In operation, a motor actuates said connecting
rod .25 which in turn rotates said propeller [0 by
a crank-like motion which carries said scoops
Figure 7 is an enlarged, perspective view of 30
I 6 into the water during part of their travel, thus
the propeller guide member mounted to a sup
driving the boat forward.
porting bracket that is attached to a boat.
What I claim is:
As illustrated, a propeller H) is associated with
l. A propelling device comprising a propeller
a stationary guide member H! which is partly
embodying a body portion having a plurality of
circular, being more than half but less than a 35
blades, at the periphery thereof, a guide member
whole circle. Its lower edge I 3 is horizontal or
associated therewith having a portion of its
truncated or, at least, there is a break in the
peripheral surface curved and a portion straight,
continuity of the circle. Said propelling device
means to support said member and propeller
has a circular disc-like body portion IS on the
periphery of which are blades or scoops l 6 which 40 adapted to be connected to a boat, and means
operatively connected to said propeller to rotate
have a rear portion or back Ilia and a side l?b.
it, said blades being outside of, opposite to and
Said body l5 serves as another side. Said scoops
adjacent said curved peripheral surface.
,
l6 taper in depth as they curve inwardly towards
2. A propelling device comprising a propeller
said body portion l5 as shown in Figure 2 of the
drawings. The inner surfaces of said scoops I6 45 embodying a body portion having a plurality of
scoops at the periphery thereof that extend lat
are closed to the peripheral surface of said guide
member I2 and, therefore, its sides are lower,
erally beyond said body portion, a guide member
having a portion of its peripheral surface in the
form of a partial circle and having a non-circular
opposite said guide member I'Z during the rota 50 portion, said scoops being so positioned on said
body portion with relation to said guide member
tive movement.
curved peripheral surface that said scoops pass
Said guide member I2 is ?xedly attached, as
at a point outside of, adjacent and opposite to
by welding, to a supporting bracket 18. Said
said circular surface, means to support said guide
bracket l8 may be attached to the stern of a
boat B by bolts M. A stud I9 extends through 55 member and propeller adapted to be connected
to avoid having said scoops I6 holding any ap
preciable amount of water while they are located
2,404,044
3 r“
to a boat, and means operatively connected to
said propeller to rotate it.
3. A propelling device comprising a propeller
embodying a body portion having a plurality of
blades at the periphery thereof that extend lat
erally beyond said body portion, said blades em
4
4. A propelling device comprising a propeller
embodying a body portion having four scoops at
the periphery thereof, that extend laterally be
yong said body portion, said scoops embodying a
back, a bottom and a side portion and being so
positioned that a portion of said body provides
bodying a back, a bottom and a side portion and
a side for said blade opposite to but spaced from
being so positioned that a portion of said body
said side portion, said side portion tapering in
wardly from said back, a guide member in the
provides a side for said blade opposite topbut
spaced from said side portion, a guide member 10 form of a partial circle that is more than half
a circle and whose lower edge is truncated, said
in the form of a partial circle that is more than
half a circle and whose lower edge is truncated,
said scoops being so positioned with relation to
scoops being so positioned with relation to the
portion, the width of the peripheral surface of 1
said circular portion of said guide member being >
as great as the width of said scoops, means to
support said guide member and propeller adapted 20
to be connected to a boat, and means operatively
cular portion of said guide member being as
curvedportion of said guide member that they
pass at a point outside of, adjacent and opposite
the curved portion of said guide member’ that’
they pass at a point outside of, adjacent and op v15 to the peripheral surface of said circular portion,
the width of the peripheral surface of said cir
posite to the peripheral surface of said circular
connected to said propeller to rotate it.
great as the width of said scoops, means to sup-,
port said guide member and propeller adapted
to be connected to a boat, and means operatively
connected to said propeller to rotate it.‘
MARCUS FALK.
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