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Патент USA US2131490

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Sept. 27, 1938.
N. E. WALKER
TOY AEROPLANE PROPELLER MOUNTING
Filed Sept. -4, 1936
'
‘2331,490
Patented Sept. 27, 1938
2,131,490
UNITED STATES PATENT OFFICE
2,131,490
TOY AEBOPLANE PBOPELLER MOUNTING
Nevillcs E. Walker, Portland, Oreg.
Application September 4, 1936, Serial No. 99,364
19Clalms. (CI. 46-78)
My invention relates to toy aeroplanes and has
for a speci?c'object the provision of simple and
inexpensive means for mounting the propeller
and the landing gear, said parts being arranged
5 to withstand substantial shock without destruc
tive distortion.
Further and more speci?c methods of my in
vention are to provide a propeller mounting
which is:
10
l. Capable of accommodating a propeller of
uniform thickness without requiring said propel
ler to be perforated or otherwise weakened t I
secure a hub or journal thereto;
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2. which is resiliently mounted in the fuselage
'15 so that the propeller can be easily twisted out of .
Fig. 1 is a perspective view of a toy aeroplane '
embodying my invention;
,
,
Fig. 2 is a fragmentary plan view of the pro
peller mounting with portions of the fuselage
and propeller shown joined thereto;
K
Fig. 3 is an elevation of the forward end of
the fuselage, the propeller and its mounting, illus
trating how the propeller can be tipped angularly
out of its normal ?ying plane in said mounting
thru the resilient manner in which said propeller 10 ’
is seated in said mounting;
_
Fig. 4 is a side elevation‘of said mounting, a
portion being shown broken ‘away to disclose
details of construction; v
.
-
I Fig. 5 is a longitudinal section thru said mount- 15
its operating plane to prevent breakage when - ing and the associated parts taken substantially
said toy aeroplane strikes the ground nose first,
which mounting ?rmly holds the propeller and
the hub to prevent relative rotation thereof, and
20 which structure is adapted to permit the propeller
to be moimted on the fuselage without unship
ping or removing said propeller in packaging
said toy aeroplane, said features being present in
a mounting which automatically and resiliently
25 arranges the propeller at its proper ?ying angle;
3. One which imposes increased resistance to
the rotation of the propeller under the in?uence
of a twisted band motor when said band motor is
twisted to maximum distortion, said resistance
30 retarding the effective speed of rotation of said
propeller, said moimting progressively decreasing
the resistance as said band motor untwists there
by permitting freer rotation of said propeller and
securing a more uniform overall ?ying speed
35 when used with an uncoiling rubber band which
gives varying torque to the propeller;
-
4. A mounting which permits the use of simpl
light and eillcient anti-friction bearings for the
propeller involving negligible expense and eill
40 cient action;
_
on the line .5-5 in Fig. 4;
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Fig. 6 is an enlarged sectional view thru the
propeller hub, the anti-friction bearings and the
forward end of the'propeller mounting, and
20
Fig. 7 is a sectional view taken'on the line 1-1
in Fig. 6 thru the anti-friction bearings and il
lustrates the construction thereof.
,
A toy aeroplane embodying my invention com
prises a fuselage a which may be in the form ‘of 25
an elongated rectangular wooden section. Ex
tending thru a slot 0.’ formed in said fuselage is
a single wing structure b. The tail structure
comprises two members c and‘d, secured to the
rear end of said fuselage, the member'c extends 80
vertically inv a slot a2 formed at the rearward
edge of said fuselage and a horizontal tail mem
i
ber dis securedto the under side of said fuselage - _
by the rubber band or similar element e.
‘
At the forward end of the fuselage a nose piece 35
,f is provided which‘ ‘constitutes the - principal‘
portion of the propeller ‘mounting. A .tubular
hub g is joumalled in the depending forward end .
of the nose piece I being journalled in a hole h
formed in said forward end. Said nose piece is
formed of an integral section of metal U-shaped
in section. The principal web I! overlies‘ the
tapered forward end a3 of-the fuselage, this being
40 -
5. A moimting which provides a convenient de
tachable support for thelanding gear and its
support which landing gear engages said mount
ing and tends to increase the engagement be ‘ illustrated in Fig. 4.
4? tween said mounting and the fuselage of said
toy aeroplane; and
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6. A mounting which permits the use of a rel-1
atively small quantity of metal and permits the
Laterally projecting ?anges l3 and 14 extend 4.5
downwardly as 'i‘svindicated most clearly in Figs.
1 and 3,. and__ engage the' sides of said tapered
forward end a3.‘ Underlying said forward end
use on the remainder of said toy aeroplane of - are two inwardly bent lips 15 and I! which en
50 light balsa wood and thin propellers to increase circle said underside and hold the nose piece in 50
the living range and ?ying ability of said toy
aeroplane.
Further and other objects and advantages of
my- invention are hereinafter described with ref
‘5 erence to the accompanying drawing in which:
place. Extending 'rearwardly from the ?anges
f3, and ‘fl are spring-like clamps fl and 18, as is
indicated in Figs. 2 and 5. Said clamps de?ne .
two laterally alined grooves i.—i' for accommo
dating a bifurcated resilient landing gear sup- 5s
2
2,181,490
port a‘. Said landing gear support if preferably
rubber band as is indicated in Fig. 5. As has
is made of a single piece of wire, such for example
as piano wire, and at the middle an inverted
U-shaped structure 7" is formed. Said U-shaped
structure overlies the web )‘2 of the nose piece
and engages and grips the clamping elements I‘!
and f8 between them. Said U-shaped structure
seats in the grooves i—i’ and thus is prevented
from shifting laterally on said nose piece.‘ At the
10 lower end, wheels lc-lc' are provided which‘are
previously been stated, said rubber band is pref
erably arranged in endless form and extends
about the central portion of said propeller. Said
propeller is provided with a lateral projection m’
at its middle ‘which is substantially of the same
width as the diameter of the tubular hub so as
to ?t into said bore and to hold said propeller
against lateral shifting in the slot y’ when said
propeller is resiliently held in said slots by the
carried by laterally o?'set projections 7'2 at the
ends of the wire forming the landing support
action of the rubber band motor.
When the rubber band motor is arranged about
gear 7.
said propeller the latter is permitted to be tipped
easily as is shown in Fig. 3, if the rubber band is
not twisted severely to shorten its overall length.
This permits the propeller to be swung out of its
normal position to permit easy packaging of the
said toy aeroplane without removing said pro
peller. The propeller is prevented from shifting
laterally by said central offset portion 1n’. Said
propeller structure also permits the propeller to
be moved angularly to prevent breakage of said
propeller if said toy aeroplane strikes a solid
The forward end of said nose piece spreads and
broadens out into a mushroom head J‘! in which
the hole h is formed. Said mushroom-shaped
head provides adequate bearing for maintaining
the hub g in its proper angular position with
respect to the longitudinal dimension of the
20 fuselage to provide correct ?ying angle for said
aeroplane. The twisted rubber band rotor e is
secured at its rearward end upon a hook I depend
ing downwardly from the fuselage. Said rubber
band motor preferably is arranged in endless form
25 and the rearward loop extends about said hook
and the forward end passes thru the bore of the
tubular hub 1 and is looped about the middle of
the propeller m. The propeller is made of rela
tively thin strong material, but of- uniform thick
30 ness. This permits the propeller to be stamped
out of sheets of material and twisted to proper
shape rather than requiring said propeller to be
shaped out of a relatively large block of wood with
the attendant waste and manufacturing .expense
to secure a thick hub. "
‘1 _
‘
‘
.
Said tubular hub is provided with slots g’ of
su?icient width to accommodate the propeller.
Said slots are adapted to fit snugly against the
sides of the propeller so as to prevent substan
40 tial play. Said slots are arranged relatively angu
larly to each other and to the axial dimension
of the tubular hub so that the propeller is not
required to have a ?at central section to seat in
said slots. Said slots extend from the forward
45 edge of the propeller rearwardly a su?lcient dis
tance to accommodate the width of the central
part of said propeller. Extending rearwardly of
said propeller is a laterally formed shoulder 92
formed in the hub g. Said shoulder preferably
is formed by crimping the material of which the
tubular hub is formed to de?ne a laterally extend-.
ing exterior ?ange of double the thickness of the
walls of said hub. Said ?ange is of sumciently
great diameter to provide‘ a solid shoulder for
alining the hub correctly with respect to the nose
piece.
I preferably provide an anti-friction bearing 1|.
between said shoulder 92. and the forward mush
room shaped head 1‘! of the nosepiece. ‘ Said anti
60 friction bearing is preferably constructed of two
opposed cups n’ and M.‘ The cup n’ is of slightly
larger diameter than the cup 112 and thus the cup
n2 nests within the cup 11'. as is shown in Fig. 6.
..Ball bearings n3 arehoused within said cups in
a ?at race n4. Said race n4 is preferably 'crimped
‘ within the rim of the cup 112 to rotate therewith.
‘ When said anti-friction bearing is in place, the
rearward end 93 of the tubular hub is ?ared out
wardly so as to prevent said hub from‘bei‘ng re
tracted from the nosepie'ce._ This is shown most
clearly in Figs. 5 and 6.
. '
i
_
The rubber band motor e extends thru the bore
of said hub and is permitted free movement in
said bore inasmuch as the diameter of said bore
75 is substantially greater than the width of the
object at the end of its ?ight, or ends nose down
on the ground or otherwise strikes some solid
object.
‘
.
One of the diillculties in using a rubber band
motor is that its distortion when- twisted tends
to provide greater torque when it is twisted to its
maximum degree and a decreasing torque as said
rubber band becomes untwisted. This tends to
cause the propeller to be rotated at a higher speed
at the commencement of ?ight and a correspond
ingly lower speed as the untwisting continues.
By securing the propeller directly to the rubber
band so that it tends to become seated more tightly
as the overall length of the rubber band di
minishes when twisted, a corresponding increase
in resistance to rotation is secured. Thus, when
the rubber band is twisted to its maximum degree
it imposes a correspondingly increased friction to
prevent rotation of said propeller. As said band
becomes, untwisted said friction decreases some
what in proportion to the force exerted by the
partly untwisted‘ rubber band. This structure
causes the speed of the propeller under the in
?uence of said rubber band to become more um
form over a sustained ?ight and increases the
?ying ability of said toy aeroplane. Anti-fric
tion bearings are interposed to minimize said
friction and-do not disturb this relationship but
do‘ prevent said friction from becoming too great
to prevent the propeller from rotating freely.
The wings and tail structure and fuselageof
said toy aeroplane are preferably constructed of
balsa wood and the nose piece is preferably con
structed of relatively thin stamped sheet metal,
such for example, as thin copper or aluminum.
The tubular hub bearings are also’constmcted of
relatively light materials of thin sections and the
propeller may be constructed of hard wood or
‘ ply wood. The propeller being of uniform thick
ness may be easily and inexpensively stamped
from a sheet of uniform thickness and distorted
to proper pitch._
I claim:
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1. In a'toy aeroplane comprising a fuselage,
wing and tail structures, a propeller blade rotata
bly mmmted at the forward end of said fuselage 10
anda resilient band motor for rotating said pro
peller, a mountingfor said propeller comprising
a nose piece secured to said fuselage having a seat
formed in its forward end a slotted hub journ-_
nalled therein, said propeller being of uniform ‘ll
2, 131,490
thickness releasably engaging said hub at its
g
3
said member, said'band motor extending longi
tudinally of said member and engaging the pro-_
2. In a toy aeroplanecomprising a fuselage, ' peller at its middle, resiliently holding said pro
wing and tail structures, a propeller blade rotata
peller in said seatformed in said member, a lat
bly mounted at the forward end of said fuselage eral shoulder on said member operatively restrain
and a resilient band motor for rotating said pro
ing the lateraldisplacement of'said member with
peller, a mounting for said propeller including a respect to said nose piece anda‘ bearing inter
hub rotatably secured to said fuselage having a posed between said shoulder and said nose piece.
slotted seat formed in its forward end, said pro
8. In a toy aeroplane comprising'a fuselage,
middle.
.
~
_
10' peller
being of uniform thickness releasably en-' wing and tail structures, a propeller blade rotata 10
88-81118 said seat at its middle, said band motor bly mounted at the forward end of said fuselage
extending longitudinally of said hub about said‘ and a resilient band motor for rotating ‘said pro
propeller, and resiliently holding saidepropeller peller, .a nose piece secured to the forward end
in its seat.
'
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jof said fuselage constituting a mounting- for said
3. In a toy aeroplane comprising a fuselage, propeller, said nose piece provided with a journal 15
wing and tail structures, a propeller blade rotata
formed therein, a member journalled in said nose
bly mounted at the forward. end of said fuselage piece, said propeller mounted in a seat formed inv
and a resilient band motor for rotating said pro
said member, ‘said band motor‘ extending longi
peller,a mounting for said‘ propeller including a tudinally of said member anden'gmng the pro
tubular hub rotatably secured to said fuselage peller at its middle, resiliently holding said pro
having a slotted seat formed in its forward end, ‘ peller in said seat formed in said member,‘ a lat
said propeller being of uniformthickness releas
eral shoulder on said member operatively re
ably engaging said seat at its middle, said band _ straining the lateral displacement of said member
motor extending thru the bore of said tubular with respect to said nose piece, and an anti-fric
hub, about said propeller and resiliently. holding tion bearing interposed between said shoulder and
said propeller in its seat. -
>
'
4. ma toy aeroplane comprising a fuselage,
wing and tail structures, a propeller blade rotata
bly mounted at the forward end of said fuselage
and a resilient band motor for rotating said pro
peller, a moimting for said propeller including a_
_ separable hub rotatably secured to said fuselage
having a seat formed in its forward end, said pro
peller being of. uniform thickness engaging said
seat at its middle, said band ‘motor extending
longitudinally of said hub, about said propeller,
and resiliently holding said propeller in its seat.
-5. In a toy aeroplane comprising a fuselage,
wing and tail structures, a propeller blade rotat'a
blymounted at the forward end of said fuselage
and a resilient band motor for rotating said pro-~
peller, a nose piece secured to the forward end
of said fuselage constituting amounting for said
propeller, said nose piece provided with a journal
formed therein, a member journalled in said nose
piece, said propeller mounted in a seat formed in
said member, said band motor extending long!‘
tudinally of said member and engaging the pro
peller at its middle, resiliently holding said pro
50 peller in said seat formed in said member.
6. In a toy aeroplane comprising a fuselage,
wing and tail structures, a propeller blade rotata
bly mounted at the forward end of said fuselage
and a resilient band motor for rotating said pro
55 peller, a nose piece secured to the forward end of
said fuselage constituting a mounting for said
propeller, said nose piece provided with a journal
formed therein, a member journalled in said nose
piece, said propeller mounted in a seat formed in
60 said member, said band motor extending longi
' tudinally of said member and engaging the pro
peller at its middle, resiliently holding said 'pro
peller in said seat formed in said member, alat
eral shoulder on said member operatively re
65 straining the lateral displacement of said mem
ber with respect to said nose piece.
7. In a toy aeroplane comprising a fuselage,
wing and tail structures, a propeller blade ro
tatably mounted at the forward end of said fuse
lage and a resilient band motor for rotating said
said nose piece.
’
‘
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‘
9. In a toy aeroplane comprising a fuselage, I
wing and tail structures, a propeller blade rotata- "
bly mounted at the forward end of said fuselage
and a resilient band motor for rotating said-pro
peller, a nose piece secured to- the forward end
of said fuselage constituting a mounting for said
propeller, said nose piece provided with a journal
formed therein, a member journalled in said nose
piece, said propeller mounted in a seat formed in
saidpmembe'r, said band motor extending longi
tudinally of said member and engaging the pro- ~
peller at its middle, resiliently holding said pro
peller in said seat formed insaid member, a lat
eral shoulder on said member operatively re— 40
straining the lateral displacement of said member
with respect to said nose piece, an anti-friction
bearing interposed between said shoulder and
said nose piece, said anti-friction bearing com
prising two opposed cups held in operative rela 45
tion by an enlargement of said member.
10.1In a toy aeroplane comprising a fuselage,
wing and tail structures, a propeller blade rotat
ably mounted at the forward end of said fuselage
and a resilientband' motor for ‘rotating said pro 50
peller, a nose piece secured to the forward end of
said fuselage constituting a mounting for said
propeller, said nose piece provided with a journal
formed therein, a slotted tubular member jour
nalled in said nose piece, said propeller mounted
in said slotted member, said band motor extend
ing thru said tubular member and engaging the
propeller at its middle, resiliently holding said
propeller in said slotted member.
'
11. In a. toy aeroplane comprising a‘ fuselage,
wing and tail structures, a propeller blade rotat
ably mounted at the forward end of said fuselage
and a resilient band motor for rotating said pro
peller, a nose piece secured to the forward end of 05
said fuselage constituting a mounting for said
propeller, said nose piece provided with a mush
room-shaped depending forward end and a jour
nal formed therein, a slotted tubular member‘
journalled in said nose piece, said propeller 70
propeller, a nose piece secured to the forward end _ mounted in said slotted member, said band motor
of ‘said fuselage constituting a mounting for said extending thru said tubular member and engag
propeller,’ said nose piece provided with a journal ing the propeller at its middle, resiliently holding
formed therein, a member journalled in said nose said propeller. ,in said slotted member, a lateral
75' piece, said propeller mounted in a seat formed in shoulder on said tubular member operatively re 75
4
2,181,490
straining the lateral displacement of said member
with respect to said nose piece.
lage andextending longitudinally of said member
_ I and engaging the propeller at its middle, resil
12. In a toy aeroplane comprising a fuselage,
wing and tail structureaa propeller blade rotat
ably mounted at the forwardend of said fuselage
and a'resilient band motor for rotating said pro
peller, a nose piece securedto the forward end of
Y said’ fuselage constituting a mounting for said
propeller, said nose vpiece provided with a depend
ing forward end and a‘ journal formed therein
extending below said fuselage-a slotted tubular
member journalled in said nose piece, said pro
peller. mounted in said slotted member, said band
motor underlying said. fuselage, and extending
iently holding said propeller in said seat formed
in said slotted member.
4
_ '
16. In a toy aeroplane comprising a fuselage,
wing and tail structuresa propeller blade rotat
ably mounted at the forward end of said fuselage
and a resilient band motor for rotating said pro
peller-{a nose piece clamped to the forward end of
said fuselage constituting a mounting for said -
propeller, two opposed clamping members on said
nose piece gripping said- forward end between
H
.
g
.
1'7. In a- toy aeroplane comprising a fuselage,
the pro
wing and tail'structures, ‘a propeller blade rotat
18 thru said tubular member and
peller atvits middle, resiliently holding said pro ably mounted at the forward end of said fuselage
peller in said‘slotted member, a lateral shoulder ‘ and a resilient band motor for rotating said pro
on said tubular member operatively restraining peller, a nose piece secured to the forward end of
the lateral vdispllltitiment of said member with said fuselage constituting a mounting for said
respect to said nose piece. ~
propeller, laterally alined grooves formed in said
13. In a toy aeroplane comprising a fuselage, nose piece, a resilient bifurcated member consti
wing and tail. structures, a propeller ‘blade, rotat
ably mounted at the forward end of said fuselage
and a resilient band motor for rotating said pro
peller, a .nose piece secured to the forward end of
said fuselage constituting a mounting for said
propeller, said nose piece being of inverted U
shaped section and provided with a journal
formed therein, a member journalled in said nose
piece, said propeller mounted in a seat formed in
said member.
-
‘ 14. In a toy-aeroplane comprising a fuselage,
wing and tail structures, a propeller blade rotat
ably mounted 'at the forward end of said-fuselage
and a resilient band motor for rotating, said pro
peller, a nose, piece secured to the forward end of
said fuselage constituting a mounting for said
propeller, said nose piece provided with-a depend
ing forward end and a journal formed therein
extending below said fuselage, a vmember Jour
nailed in said nose piece,“ said propeller mounted
in a seat formed in said member, said band motor
underlying said fuselage and extending longi
tudinally of said member and engaging the pro
peller at its middle, resiliently holding said pro
peller in said seat formed in said member.
15. In a toy aeroplane comprising a fuselage,
wing and tail structures, a propeller blade rotat
ably mounted at the forward end of said fuselage
and a resilient band motor for rotating said pro
peller, a nose piece secured to the forward end
of said fuselage constituting a mounting for
said propeller, said nose piece provided with a
‘mushroom-shaped depending forward end and a
Journal formed therein extending below said
fuselage, a member Journalled in said nose piece,
said propeller mounted in a seat formed in said
member, said band motor underlying said fuses
tuting wheel supports, ,said member provided at
its middle with a closely bent U-shaped structure
straddling said nose piece and seated in said
18. In a toy-aeroplanecomprising a fuselage,
wing and tail structures, a propeller blade rotat
ably mounted at the forward end of said fuselage
and a resilient band motor for rotating said pro
peller, a nose piece clamped to the forward end
of said fuselage constituting a mounting for said,
propeller, vtwo opposed clamping members on said
nose piece gripping. ‘said forward end between
them, laterally alined grooves formed in said
clamping members of said nose piece, a resilient
bifurcated member constituting wheel supports,‘ 35
said member provided at its middle with a closely
bent U-shaped structure straddling said clamping
members of said nose piece and seated in said
grooves.
-
19. In a toy aeroplane comprising a’ fuselage,
wingand tail structures, a propeller blade rotat
ably mounted at the forward end of said fuselage
and a resilient band motor for rotating said pro
peller, a now piece clamped tothe forward end
of said fuselage constituting a mounting for said
propeller, two opposed clampingmembers on said
nose piece gripping said forward end between
them, laterally alined _ grooves formed in said
clamping members of said nose piece, a resilient
bifurcated member constituting wheel supports,
said member provided at its middle with a closely
bent u-shaped structure straddling said clamping
members of said nose piece and seated in‘said
grooves and gripping said nose piece, tending to
force the latter into tighter engagement with
said fuselage.
NEVILLES E. WALKER.
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