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Патент USA US3095057

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June 25, 1963
Filed Aug. lb. 1960
Leo A. He/h/ze/man
BY WWW 5M3],
United States Patent 0 ”
Patented June ‘25, 1963
of a propeller shaft in the usual manner. Extending out
wardly from the hub 14 is a pair of propeller blades 16 of
identical construction and the propeller blades are disposed
Leo A. Heintzelman, Grmdville, Mich.
at a desired angle and are of a particular size dependent
(4990 Burlingame, Wyoming 9, Mich.)
Filed Aug. 10, 1960, Ser. No. 48,680
upon the particular type of motor or engine which will
2 Claims. (Cl. 170-16011)
drive the propeller. The construction of the hub and the
orientation of the blades 16 is conventional and each
The present invention generally relates to an attach
blade 16 is provided with a generally curved outer edge
ment for boat propellers and more particularly to such an
attachment that will slide radially outwardly to increase 10
Adjacent the outer edge 18 of each 'blade 16 is the
the surface area of the propeller blade thus maintaining
attachment 12 which is in the form of substantially an
the operation of the propeller at its maximum e?iciency.
arcuate plate 20 having a rounded outer edge 22 general
It is well known that engines used in propelling boats
ly conforming to the edge 18. The end edges of the plate
and especially small boats produce their maximum horse
20 are rounded as indicated by the numeral 24 and the
power at a relatively high rotational speed. Inasmuch 15 inner edge thereof is provided with ‘a concave curvature
as the resistance to rotation of the propeller for the boat
26 thereon.
is the same at low rotational speeds as it is at high rota
The plate 20 is adapted to move inwardly and outwardly
tional speeds, the engine quite frequently will not reach
in relation to the blade with one end of the plate 20 gen
optimum operating speeds until after an extended period
erally moving along a radius extending from the center of
of time. Therefore, the present invention incorporates 20 the hub 14 and the other end of the plate 20 moving in
a structure which will enable the resistance to rotation of
parallel relation thereto.
the propeller to be relatively low in the initial stages of
For mounting the plate 20 slidably on the blade 16,
rotation of the propeller and until the propeller reaches a
there is provided a pair of pins 26 and 28 extending
predetermined speed at which time the attachment of the
through apertures 30 in the blade 16 and retained in posi
present invention will be rendered e?ective by centrifugal 25 tion by cotter pins 32 or the like. The other end of the
force thus increasing the e?ective diameter and surface
pins '26 and 28 are headed as indicated by the numeral 34.
area of the blades of the propeller thereby increasing the
The pins 26 and 28 extend through an elongated gener
resistance .to rotation and of course propelling the boat in
ally rectangular slot 36 in the plate 20* and the pins are
the desired manner. The extending of the attachment is
in alignment with each other in the direction of sliding
no accomplished until such time as the boat propeller has
movement of {the plate 20.
reached a predetermined speed inasmuch as centrifugal
Overlying the slot or enlarged opening 36 and forming
force is relied upon to operate the attachment.
a closure therefor is a retaining plate 38. The pins 26 and
Still another important object of the present invention
28 also extend through the retaining plate 3% and retains
is to provide an attachment for ‘boat propellers which is
the plate 38 against the outer surface of the sliding plate
in the form of a sliding element spring biased radially in 35 20 for forming a closure for the opening or slot 36 in the
wardly and movable outwardly in response to centrifugal
force and including means for guiding the movement of
the attachment in relation to the propeller blades.
sliding plate 20. Thus, the plate 20 is capable of sliding
between the blade 16 and the retaining plate 38 and the
plate 20 is retained in position by the pins 26 and 28 ex
Still another important object of the present inven
tending through the opening 36 which limits the sliding
tion is to provide a propeller attachment which will not 40 movement of the plate 30.
materially increase the thickness of the propeller blades
Means is provided for spring biasing the sliding plate
thus enabling the propeller blades to operate in substantial
20 inwardly and this means includes a ?attened spiral
ly their normal e?icient manner.
coil compression spring 40 having the end edges or por
Still another feature of the present invention is to pro
42 of the innermost loop received in notches 44 in
vide an attachment for a boat propeller which is simple 45 the side edges of the opening 36. The other end of the
in construction, easy to use, effective for its particular pur
spring 40 is provided with a hook 46 for attachment to
poses and generally inexpensive to manufacture.
the outermost pin 26. Thus, as the plate 20 moves out
These together with other objects and advantages which
wardly, it will carry the lowermost convolution of the
will become subsequently apparent reside in the details of
spring 40 with it thus compressing the spring 40 whereby
construction ‘and operation as more fully thereafter de
the spring 40 will normally urge the sliding plate 20* back
scribed and claimed, reference being had to the accom
towards the hub 14. The hook 46 is securely ?xed to
panying drawing forming a part hereof, wherein like
the pin 26 and will cooperate with the spring 40 to exert
numerals refer to like parts throughout, and in which:
force on the plate 20 for retaining it in retracted posi
FIGURE 1 is an end elevational view ‘of a boat pro
peller employing the attachment of the present invention 55
Normally, the extensible plates ‘or blades 20 are in
retracted position with the outer edge 22 coincident with
FIGURE 2 is a detailed sectional view taken substan
the outer edge 18 of the blade 16. This condition will
tially upon a plane passing along section line 2—2 of
be maintained during initial low speed rotation of the
FIGURE 1 illustrating the details of the attachment;
propeller thus enabling the engine which propels the pro
FIGURE 3 is a detailed sectional view taken substan
peller to reach van optimum operating speed. As this
tially upon a plane passing along section ‘line 3—3\ of
optimum speed is approached, the centrifugal force exert
FIGURE 2 illustrating further details of the spring mech
ed on the plates 20 due to the rotation of speed of the
anism for retaining the attachment in place; and
propeller will overcome the tension of the springs 40 and
FIGURE 4 is an exploded group fragmental perspective
thus compress the springs 40 and the plate 20 will be
view of the components of the attachment and the manner 65 moved outwardly into the dotted line position illustrated
in which the components are assembled.
in FIGURES l and 2 thus increasing the e?ective surface
Referring now speci?cally to the drawings, the numeral
area of the blades 16 for increasing the resistance to ro
10 generally designates a propeller on which the attach
tation of the propeller and, of course, increasing the
ment of the present invention is mounted and the attach
thurst on the boat. However, this does not occur ‘until
ment is generally designated by the numeral 12. The pro 70 the engine has reached the optimum operating speed thus
peller 10 is of substantially conventional construction and
enabling the engine to obtain its optimum operating speed
includes a centrally disposed hub 14 for receiving the end
quicker than with a conventional propeller.
The plate 20 is also provided with an inwardly extend
ing flange 21 that engages the opposite surface of the
blade 16 in relation to the plate 20 thereby forming a
guide for movement of the plate 20 during movement
thereof. The ?ange 21 also serves to stabilize the extensi
ble plate 20' and retain it in position when in the retracted
The foregoing is considered as illustrative only of the
principles of the invention. Further, since numerous
modi?cations and changes will readily occur to those
ing a pair of enlarged openings formed in and disposed
adjacent the opposite ends of the plates, retaining means
projecting laterally from the one face of each of said
blades extending through each opening and anchored to
the corresponding propeller blade, a retainer member on
the outer ends of each of said anchor means and slidably
engaging the corresponding extensible plate thus slidably
retaining the extension plate in position, said resilient
means interconnecting the anchor means and the extension
plates for biasing each of the extension plates radially in
wardly of the corresponding blade, said means urging the
extension plate inwardly of the propeller blade including
a ?attened spiral coil spring disposed in each opening
scribed, and accordingly, ‘all suitable modi?cations and
and having one end anchored to the extension plate and
equivalents may be resorted to, falling within the scope of
15 the other end anchored rigidly in relation to the propeller
the invention as claimed.
skilled in the art, it is not desired to limit the invention
to the exact construction and operation shown and de
What is claimed as new is as follows:
1. In combination with a boat propeller having a plur
blade thereby resiliently biasing the extension plate in
wardly in relation to the propeller blade.
'2. The combination of claim 1 wherein the innermost
ality of generally radially extending blades, an attachment
convolution of the coil spring is provided with laterally
comprising an elongated extensible plate for each blade
members, the edges of the openings in the exten
of the propeller, each of said plates overlying and extend 20 extending
sion plate having notches therein receiving the edges of
ing across one face of the outer end portion of the cor
the lowermost convolutions of the spring thereby anchor
responding blade and having a curved outer longitudinal
ing the spring to the extension plate.
edge portion generally conforming to the plan outline of
the outer edge portion of the corresponding blade, means
at each of the opposite ends of each plate slidably mount 25
ing that end on and exteriorly of the corresponding blade
by means of a pin and slot connection for movement
generally radially of the corresponding blade and includ
ing resilient means connected between portions of said
blade and the corresponding plate yieldably urging said
plate toward a radially inwardly displaced position relative
to the corresponding blade when the propeller is rotated
References Cited in the ?le of this patent
Garcia ________________ __ Jan. 12,
Upson _______________ __ Nov. 9,
Heintzelman __________ __ May 5,
Heintzelrnan et al _______ __ July 18,
at slow speed and enabling the plate to ‘move radially out
wardly when the propeller is rotated at higher speeds, said
pin and slot connections on each extension plate includ
Germany _____________ __ Sept. 11, 1920
a 425,914
Great Britain _________ __ Mar. 25, 1935
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