close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2116055

код для вставки
' May 3, 1938.
J. WEICHWALD
'
.
2,116,055
PROPELLER
Filed Jan. 17', 1936
F192
\\
>
"
’
i456
WW
ATTORNEY.
Patented May 3, 1938
2,116,055,
PATENT OFFICE
UNITED STATES
2,116,055
PROPE'LLER
John Weichwald, Chicago, Ill.
Application January 17, 1936, Serial No. 59,644
4 Claims.
(Cl. 170--159)
This invention relates to propellers and has
among its objects to provide a new and useful
propeller for aircraft and watercraft which is
characterized by a comparatively high propul
sive efficiency due to its novel design as clearly
set forth in the following speci?cation.
The propeller as shown in the illustrations in
cludes a plurality of blades, preferably two, which
Any suitable or known means of securing the
hub portion to the engine or motor shaft l2 may
be employed.
5
From the illustrations, ,it will be noted that the
propeller includes a design having as a base of
evolvement a theoretical line 'l—'! which passes
are preferably formed integrally with a hub por
transversely of the center of the hub portion and
10 tion.
An object of the invention is found in the pro
vision of a propeller having blades the design of
which is based on the following features:
(a) The blades or blade portions are preferably
15 formed with an integral hub portion.
(b) The blades or blade portions are designed
to evolve from a theoretical line intersecting the
longitudinal center line of the drive shaft at a
right angle.
20
(c) The thickness of the blades decreases pro
gressively longitudinally of the propeller from the
longitudinal axis of the hub portion to the tips of
the blade portions.
(CZ) The pitch of each blade evolves from zero
at its theoretical center of evolvement on a line
of mergence which intersects the longitudinal
axis of the‘ hub portion at a right angle thereto.
The zero pitch of the blade is shown by Fig. 7
which is a cross-section taken on the zero pitch
30 line 1-1.
2
(6) The cross-sectional thickness of each blade
decreases from the maximum on the longitudinal
center line of the blade to the minimum at the
35
transversely or right-angularly to the longitu- 10
dinal axis X--X of the drive shaft I2.
The pitch of each blade on the axis 'l—-'! is
zero and ‘each blade has a uniform increase in
pitch from zero pitch at the center of the hub
portion to its maximum pitch at its outer or tip 15
end.
As shown in Fig. 6, which is a section on the
longitudinal center line of the propeller, the thick
ness of the blade portions decreases progressively
longitudinally of the blades from a maximum
thickness at the center of the hub portion to a
minimum thickness at the tips of the blades.
As. shown in Figs. 3, 4 and 5, the cross-sectional
thickness of the blades or blade portion decreases
from the maximum on the longitudinal center 25
line of the propeller to a minimum at the leading
and trailing edges.
‘
As shown in the illustrations, the width of the
face of the blades or‘ blade portions decreases from
the hub portion I I to the tips of the propeller.
30
This application embodies certain matter which
has been divided from the showing in Figs. 10 and
11 of my co-pending application Serial No. 759,
leading and trailing edges.
698, ?led December 29, 1934, for Propellers.
(f) The width of the face of each blade de
creases from the hub portion to or toward the tip.
With the above and other objects in view, my
invention consists in the novel form, construction
I claim:
35
1. A propeller comprising a body having a cen
tral hub portion adapted to be secured to a motor
and arrangement of the propeller parts and ele
40 ments thereof, shown in preferred embodiment in
the attached illustrations, described in the fol
lowing speci?cations and particularly pointed out
in the appended claims.
Referring to the drawing:
45
Fig. 1 is a view of a propeller embodying my in
vention looking toward the engine or motor;
Fig. 2 is a side view of same;
Figs. 3, 4 and 5 are cross-sections of the blade
of the propeller taken respectively on lines 3-3,
50 4-4 and 5—5 of Fig. 1;
Fig. 6 is a longitudinal section taken on line
6--6 of Fig. 1; and
Fig. 7 is a cross-section taken on the zero pitch
line 'I--l of Fig. 1.
55'
of a pair of blades or blade portions l0 preferably
formed integrally with a hub portion ll.
The propeller as shown in the drawing consists
shaft and a pair of oppositely disposed blade por
tions arranged symmetrically about the longitu
dinal axis of the motor shaft and formed inte- 40
grally with said hub portion, said blade portions
being pitched relatively one to the other oppositely
. from the center of ' the hub portion, each blade
portion decreasing in face width from a maxi
mum at the center of the hub to a minimum at 45
the tip of the blade, and each blade portion being
symmetrical about its longitudinal center line
and having a uniform outwardly increase in pitch
evolving from zero pitch on a common theoretical
line of mergence passing transversely and right- 50
angularly to the longitudinal axis of the motor
shaft.
2. A propeller comprising a body having a cen
tral hub portion adapted to be secured to a mo
tor shaft and a pair of oppositely disposed blade 55
2
2,116,055
portions being formed symmetrically about the
longitudinal center line of the blades and inte
grally with said hub portion, said blade portions
being pitched relatively one to the other op
positely from the center of the hub portion and
so formed that the cross-sectional thickness of
each blade portion decreases from a maximum
on the longitudinal center line of the blade
portion to the minimum at the leading and trail
10 ing edges, each blade‘ portion decreasing in face
width from a maximum at the center of the hub
to a minimum at the tip of the blade, and each
blade portion having a uniform outwardly in
crease in pitch evolving from zero pitch on a
15 common theoretical line of mergence passingv
transversely and right-angularly to the longitu
dinal axis of the motor shaft.
3. A propeller blade comprising a hub por
tion and a blade portion formed integrally with
center line of the blade to the minimum at the
edges thereof, the face of the blade portion at
its theoretical line of evolvement at the hub
center being designed to be disposed transversely
and right-angularly to the longitudinal axis of
the hub, and the pitch of the blade portion in
creasing from zero, at said line of evolvement,
to the maximum at the blade tip.
4. A propeller comprising a body having a cen
tral hub portion adapted to be secured to a mo 10
tor shaft and a pair of oppositely pitched and
oppositely disposed blade portions formed inte
grally with said hub portion, each blade portion
decreasing in face width and thickness longitu
dinally of the blade from a maximum at the cen
ter of the hub to a minimum at the tip of the
blade, the blade portions having a uniform out
wardly increase in pitch evolving from zero pitch
on a common theoretical line of their mergence
20 the hub portion, said blade portion having a
passing transversely and right-angularly to the
longitudinal section which decreases in thickness
longitudinally of the blade'from a maximum
thickness at the center of the hub portion to the
minimum thickness at the blade tip, said blade
longitudinal axis of the hub portion, and the
cross-sectional thickness of each blade portion
25 portion being symmetrical about its longitudinal
center-line and decreasing in transverse cross
section from the maximum at the longitudinal
decreasing from a maximum on the longitudinal
center line of the blade portion to the minimum
at the leading and trailing edges.
JOHN WEICHWALD.
25
Документ
Категория
Без категории
Просмотров
0
Размер файла
257 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа