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Патент USA US2117360

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May 17, 1938.
R. R. RAND, JR
V 2,117,360
AEROPLANE STRUCTURE
Original Filed. Jan. 14, 1932
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4 Sheets-Sheet 1
May 17, 1938.
R. R. RAND. JR
2,117,360
AEROPLANE STRUCTURE
Original Filed Jan. 14, 1932
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4 Sheets-Sheet 2
May 17, 1933-
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R. R. RAND, JR
2,117,360
AEROPLANE STRUCTURE
Original Filed Ja'n. 14, 1932
4 Sheets-Sheet 5
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May 1 "7, 1938,
2,117,360
R. R. RAND. JR
AEROPLANE STRUCTURE
Original Filed Jan. 14, 1952
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2,117,360
Patented May 17,v 1938
UNITED STATES PATENT OFFICE
2,117,360
AEROPLANE STRUCTURE
Rufus R. Rand, Jr., Minneapolis, Minn.
Original application January 14, 1932, Serial No.
586,597. Divided and this application March
13, 1935, Serial No. 10,821 -
10 Claims.
(Cl. 244--101)
This invention relates to an aeroplane and par
ticularly to an aeroplane of the amphibian type.
The invention is furthermore particularly di
rected to the landing gear of said aeroplane and
the structure of the hull with which said landing
gear is associated.
It is an object of this invention to provide an
aeroplane which may be supported on wheels
when landing on the ground and which has a
hull comprising compartments into which said
wheels may be moved and said compartments
closed by hinged doors when said aeroplane is to
land upon the water.
It is a further object of the invention to provide
simple and efficient means for operating said
Fig. 7 is a partial view similar to Fig. 6 shown
on an enlarged scale;
Fig‘. 8 is a view in vertical section through cer
tain parts shown in Fig. 5 and shown on an en
larged scale;
Ci
Fig. 9 is a vertical section taken substantially
on line 9—5 of Fig. '7 as indicated by the arrow;
Fig. 10 is a vertical section taken substantially
on line l0—-H) of Fig. 5; and
Fig. 11 is a horizontal section taken on line 1 0
II—H of Fig. 10 as indicated by the arrow.
This application is a division of applicant’s co
pending application S. N. 586,597, ?led January
doors mentioned in the preceding paragraph.
14, 1932, on “Amphibianairplane” which ma
tured into Patent No. 2,003,975 granted June 4,.
1935.
It is still another object of the invention to
provide an aeroplane having a hull and a land
ing gear comprising wheels together with re
20 silient means carrying said wheels so that said
hull may be resiliently supported.
It is a further object of the invention to pro
shown comprising a hull 20. .As fully described
in said prior application said hull is carried by
and suspended from a central main frame 2|,
certain parts of which are shown in Figs. 1 and 4.
Said hull is fully described in said prior applica
vide an aeroplane having a hull and a landing
gear comprising wheels, said hull having com
partments into which said wheels are movable to
gether with simple and efficient means for moving
said wheels into and partially out of said com
partments.
It is still another object of the invention to pro
30 vide an aeroplane having a central main frame,
a hull connected to and suspended from said
frame and a landing gear connected to said frame
for supporting said hull.
These and other objects and advantages of the
35 invention will be fully set forth in the following
description made in connection with the accom
panying drawings, in which like reference char
acters refer to similar parts throughout the sev
eral views and in which:— '
40
Fig. 1 is a partial plan view of the aeroplane;
Fig. 2 is a vertical section taken transversely
through one of the wheel receiving compart
ments of the hull;
Fig. 3 is a partial longitudinal section taken
45 substantially on line 3--3 of Fig. 2 as indicated
by the arrows;
Fig. 4 is a partial longitudinal section taken
substantially on line 4-4 of Fig. l as indicated
by the arrow;
Fig. 5 is a partial view in side elevation of a
50
portion of the hull and landing gear, some parts
being broken away and others shown in vertical
section;
Fig. 6 is a vertical section taken on line 6--6 of
55 Fig. 5 as indicated by the arrows;
Referring to the drawings, an aeroplane is
tion and the same comprises a central watertight
compartment 20a and compartments 291) at each
side of compartment 20a. While‘ the speci?c
construction of said hull forms no part of the
claimed matter in this application, it may be
stated that said hull,comprises longitudinally
extending members 2llc-‘and 29d and‘ partition
walls 20c and 20]‘, which walls will be formed of ‘.
some suitable thin material such as plywood.
Additional and auxiliary longitudinally extend
ing members 209' are also shown as well as verti
cally extending bows 2th and 262'.
The bottom
of the hull is also shown as 207’. Bearings 22 are 35
provided on hull 2i] and a tube 23 extends be
tween and through bearings 22, being journaled
therein. The bearings 22 form part of a plate
22a secured to hull 2B and said bearings have caps
22?).
Plate 22a has a portion or flange 22c‘ ex
tending at right angles thereto and this forms
part of the connecting means between frame 2|
and the hull, said frame having a flange 2m
extending from one of its tubular members which
is bolted between flange 22c and another flange
24a of a plate 24 also secured to the hull. Bolts
25 and 26 connect the ?anges 22c‘ and 24a, some
of which extend through the longitudinal mem~
bers of the hull. Plate 24 is additionally secured
to a flange or plate 26a also secured to frame 2| 50
as shown in Fig. 4. It is thus seen that hull 20 is
suspended from the main frame and that mem
ber or tube 23 extends transversely at the top of
the hull. Member 23 has secured thereto adja
cent either end a pair of tubular members or.
2
2,117,360
sockets 2?, these being disposed at the top of the
compartments 261). Members 2'! will be welded
upwardly between the ?anges of bearing 60, the
or brazed to member 23. Members 28 have their
upper ends disposed in and secured in members
end of an arm 63 which is secured to and projects
27 by brazing or by pins 23, or both, and said
members have thereon respectively collars 28a.
Members ‘28 continue below said collars and have
their lower ends received in and slidable in mem
bers 33 which are of tubular form, the same hav
ing their lower ends bifurcated and embracing
?anges am extending centrally respectively of
bearings 3!.
Bearings 3! have journaled therein
the axle 32 of a Wheel 33 shown as having a rim
33a on which is mounted the pneumatic tire 332).
15 Members 3!] are each divided intermediate their
same being secured at its upper end to the outer
radially from member 23. The outer member 30
has secured to its lower end a bracket 55 having
a U-shaped portion in which is disposed a pulley
36 journaled on a stud. 6'! secured in bracket 65.
A ?exible member or cable 58 which may be a
rather sti?f wire, such as a woven wire cable,
runs over the top of pulley 6B and under a pair 10
of pulleys 63 disposed at either side of pulley 66
‘when the parts are in the position shown in Fig. 5,
said pulleys '69 being rotatably mounted in small
ends and hinged together by hinge 35. The parts
bearings ‘it! secured to the hull member 20d. Ca
ble 38 extends from pulleys 59 over other pulleys 15
?! rotatably mounted in small brackets 12 secured
of hinge 34 are welded or brazed to the parts of
to the inner side of member 23d.
The ends of
member 3!].v Members 38 also have collars 33a. cable 58 are secured to headed pins 73 arranged
secured thereto and a plurality of washers 35
are disposed between the collars 28a and 33a,
which washers will be of some resilient material
such as rubber. The inner bearing 3! also has
secured thereto a rod 35 illustrated as of tubular
form, the same being welded or otherwise suitably
25 secured to said bearing 3!. Rod 36 has a hub
at its other end journaled on a stud 31 secured
in a bracket 38, in turn secured to partition 29c.
Said hub is held in place by a washer 39 secured
to travel in slots 74a formed in the spaced par
allel ?anges of brackets 14 secured to the inner 20
side of door 55. A tube 75 of U-shape is secured
in each compartment 26b. Said tube is secured
to the outer side of partition 206 by a clip bracket
"E5.
The rear end of tube 15 is disposed a slight
distance above the bottom of compartment 20b 26
or above door 55. The forward end of the tube
has a ?ange 75a thereon and the opening in the
tube alines with an opening 20k in the bottom
to stud 3'! by a headed bolt or screw 40. An
arcuate bar or plate 6! is secured to the outer
side of partition 20c by a plurality of rivets 42
and the same has its lower end bent into U-shape
23y‘ of compartment 201) in front of the door 55.
A spout Tl having a rearwardly directed open 30
forming a bearing and stop in which bearing Bl
is received when wheel 33 is in its lowest position.
against the under side of bottom 297' and con
Said member 4! is also curved at its upper end
to be engaged by bearing 3! and form a stop for
the upper position of wheel 33.
Member 23 has secured thereto an upwardly
extending arm 43 wlnch is pivotally connected
40 at its upper end to one end of a link 45, which
link is pivotally connected at its other end by a
pivot 46 to a screw 4?. Screw 3'! extends through
and engages a nut 48 journaled in a bearing 59
secured to the top of hull 2D. Nut 48 has ?anges
45 engaging each end of bearing 49 and extends
from said bearing in tubular form, the same ex
tending to and being journaled in another bear
ing 50 secured to the top of hull 25. Bearing 50
is of rectangular form in plan and has journaled
in one end a beveled gear 5! secured to member
48. Gear 5! meshes with another beveled gear
52 secured to a shaft journaled in one side of
bearing 58, to which shaft is secured a hand
crank 53 which is disposed at one side of the cen
55 tral compartment of the hull which at this point
forms the cockpit.
A door 55 is provided to close the bottom of
compartment 202), the same being hinged by a
hinge 56 to the member 200 of the hull. Said
60 door has secured to its inner side a bracket 5'!
comprising closely disposed parallel ?anges hav
ing slots 51a therein. A lever 58 is pivotally
mounted at one end by pivot 59 in a bearing
6!] secured to partition 20c adjacent member 230
65 of the hull.
Lever 58 is curved and has a hub
end is disposed beneath opening 20k alining
therewith and having a ?ange 'l'la disposed
nected through said bottom to ?ange 150. by cir
cumferentially spaced bolts ‘I8.
35
In operation, when the plane is to be used to
land on the ground, the wheels 33 will be in the
position shown in Fig. 5. They can be moved
to this position by the operator turning crank
53, thus rotating beveled gears 5! and 52 and 40
member 48. Rotation of member 48 moves screw
it‘! rearwardly, oscillating arm 44 and member 23.
Members 28 and 33 are oscillated with member
23 and the wheels move downwardly until bear
ings 3! engage the lower ends of members 4!. 45
At this time the parts of member 30 are in longi
tudinal alinement and any upward thrust on
the wheels 33 is transmitted directly to members
33 and to resilient washers 35 by collars 33a. The
thrust is transmitted directly to the frame 2!
through member 23 which is directly connected
to the frame. As member 23 is oscillated by arm
Ml arm. 64 is also moved in a clockwise direction
thus pulling upwardly on cable 63.
This oscil~
lates lever 58 about pivot 59 swinging the same; .
downwardly and inwardly.
This movement of '
lever 53 through the pin 6! acting on bracket
5‘! swings open the door 55, the same being moved
to the position shown in Figs. 6 and '7 where it is
substantially parallel to the bottom 207' of the
hull.
If the aeroplane is to make a landing upon
water the operator will rotate crank 53, thus
rotating nut 48 and moving screw 4‘! forwardly.
This swings arm M and oscillates member 23. .65
at its other end disposed and movable between
Members 28 and 30 are thus swung in a counter
the ?anges of bracket 5‘! as shown in Figs. 5 and
11. A pin 6! is secured in said hub of lever 58
and projects at each end thereof into the slots
clockwise direction and pull upon bearings 3!,
causing the same to swing upwardly with rod 36
70 51a substantially ?tting in said slots.
Lever 58
is bifurcated at its pivoted end and has disposed
on the pivot 59 a pulley 62, bearing 66 having
spaced ?anges between which lever 53 is disposed.
A ?exible member or cable 53 is secured to a pin
75 64a carried in lever 58 and runs over pulley 62
about the axis of stud 37.
The wheels are thus
swung upwardly until bearings 3! engage the -70
upper ends of bars 4!. In this movement it will
be seen that the parts of member 3!’! swing about
the axis of hinge 34 as shown in dotted lines in
Fig. 5. When member 23 is oscillated arm 64 is
also oscillated thus slacking the cable 63. Door
‘2,117,360
55 tends to move downwardly by gravity and thus
partly closes.
As members 38 are swung up
wardly pulley 66 is moved forwardly thus pulling
on cable 68. Pins '53 move along in the slots 14a
and after the wheel 33 is sufficiently raised pins
‘I3 act on brackets 14 to move door 55 upwardly to
closed position. Pins 13 as door 55 approaches
closed position again move outwardly or toward
the outer ends of slots “Ma and when the door is
10 tightly closed pins 73 are in the outer ends of
slots ‘Illa. as shown in Fig. 10. The wheels are
now‘ disposed completely in the compartments till)
and will not engage the water when the plane
lands.
When the plane alights on the water the water
will enter the compartments 2% substantially to
the depth of the draft of the plane, such water
being indicated as 80 in Fig. 3. As the plane
moves forward on the water after the doors 55 are
closed, the water will be siphoned out through
the pipe 15. This action will take place since
there will be an area of low pressure in the rear
of spout Ti and the water will be drawn through
pipe 15 as indicated by the arrows in Fig. 3. The
amount of water in compartments 2% will there
fore be materially lessened as the plane moves
forward.
From the above description it is seen that ap
plicant has provided a very simple and e?‘icient
fit) structure of aeroplane provided with means for
landing either on the ground or on the water.
The wheels can be easily and quickly projected or
retracted and as described the doors 55 will be
simultaneously operated. The landing gear is
effectively supported fromv the frame to which
all main stresses are transmitted.
It will, of course, be understood that various
changes may be made in the form, details, ar
rangement and proportions of the parts, without
40 departing from the scope of applicant's invention,
which generally stated, consists in a device capa
ble of carrying out the objects above set forth
in the parts and combinations of parts disclosed
and de?ned in the appended claims.
What is claimed is:—
1. An aeroplane having in combination, a hull
having a compartment at one side thereof hav
ing an open bottom, a door hinged to close said
bottom, a wheel arranged to be partly disposed in
said compartment or to be moved upwardly to be
50
disposed entirely in said compartment and means
for closing said door including a ?exible cable
attached to said door, guide means for said cable
and means movable with and carried by said
wheel for moving said ?exible cable.
2. An aeroplane having in combination, a hull,
said hull having a compartment at one side, a
wheel for supporting said hull, means carrying
said wheel and swingable therewith to swing said
(it) wheel into said compartment, a door for closing
the bottom of said compartment, a member os
cillatable in said hull to which said means is
connected for swinging said means and wheel,
means manipulated by the operator for swinging
65 said member, a lever pivoted at the side of said
compartment and adjacent the lower end thereof
connected to said door for swinging the same, a
?exible means connected to said lever and to said
last mentioned member for swinging said lever,
70 a second ?exible member secured to said door
for moving the same to closed position
means movable with said wheel over which
second ?exible member moves to pull upon
?exible member and close said door.
3. An aeroplane having in combination, a
75
and
said
said
hull
3
having a compartment therein, a wheel for sup
porting said hull, means carrying said wheel and
swingable therewith to swing said wheel into said
compartment, said compartment having an open
lower end, a door for closing said open end of
said compartment, a bracket secured to said door
having a slot therein, a second bracket secured to
the wall of said compartment at its lower end, an
arm pivoted to said second bracket and extend
ing to said ?rst mentioned bracket, said arm hav
ing means secured thereto and disposed in said
slot and means manipulable by the operator for
swinging said arm to cause the same to swing
said door to open position.
4. An aeroplane having in combination, a hull 1.;
having a compartment therein, a wheel for sup
porting said hull, means carrying said wheel‘ and
swingable therewith to swing said wheel into said
compartment, said compartment having an open
lower end, a door hinged to said hull about an
axis extending longitudinally thereof for closing
said compartment, brackets extending trans
versely of said door adjacent its ends, a ?exible
member having ends secured in said brackets re
spectively, pulleys carried by said door adjacent 25
its hinged side over which said ?exible member
runs and a pulley carried by ‘said wheel over
which said ?exible member runs whereby when
said wheel is swung into said compartment said
80
door will be closed.
5. The structure set forth in claim 4, said
brackets having elongated slots therein and
members movable in said slots to which the ends
of said ?exible member are secured.
6. An aeroplane having in combination, a hull 86
having a compartment at one side having an
open bottom, a door hinged to close said bottom,
a wheel constructed and arranged to be moved
into said compartment or projected therefrom, a
?exible member connected at its ends to spaced
points on said door, means carried by said wheel
over which said ?exible member passes so that
as said wheel is moved into said compartment,
said door is swung to closed position.
7. An aeroplane having in combination, ‘a hull 45
having a. compartment at one side having an
open bottom, a door hinged to close said bottom,
a wheel constructed and arranged to be moved
into said compartment or projected therefrom, a
?exible cable secured at its ends to spaced points
on said door, a pulley carried by said wheel over
which said cable runs between its ends and guide
pulleys on said wheel and door for said cable
whereby when said wheel is moved into said com
partment said door is swung to closed position.
8. An aeroplane having in combination, a hull,
said hull having a compartment at one side, a
wheel for supporting said hull, a shaft extending
transversely of said hull, a compartment adja
cent the top thereof, a» pair of struts secured at 60
one end of said shaft and having bearings at
their other ends in which said wheel is mounted
between said struts, each of said struts compris
ing a pair of hinged sections having abutting
ends, hinges connecting said sections, a shock ab
sorber carried by each. strut above the hinge
thereof, a rod secured to one of said bearings and
swingable about a ?xed axis at its other end, a
?xed guide concentric with said axis for guiding
said wheel, an arm secured to said shaft and 70
means manipulable by the operator connected to
said arm for oscillating said shaft and swinging
said struts and wheel whereby said sections are
folded about said hinges and said wheel is
swung into said compartment.
75
2,117,360
9. An aeroplane having in combination, a hull,
said hull having a compartment at one side
adapted to receive a wheel, a door hinged at one
side of said compartment about an axis extend
ing generally longitudinally of said aeroplane, a
member pivoted at one side of said compart
ment adjacent the bottom thereof and connected
at one end to said door, means manipulable by
the operator and comprising ?exible means se
10 cured to said member for oscillating the same
and moving said door to open position, a second
?exible means secured to said door and means
for moving said ?exible means to move said door
to closed position.
10. An aeroplane having in combination, a
15
hull, said hull having a compartment at one side,
a wheel for supporting said hull, a shaft extend
ing transversely of said hull and said compart
ment adjacent the top thereof, a pair of struts
20 secured at one end to said shaft and having bear
ings at their other ends in which said wheel is
mounted between said struts, each of said struts
comprising a pair of hinged sections having abut
ting ends, hinges connecting said sections, a
shock absorber carried by each strut above the 5
hinge thereof, an arm secured to said shaft,
means manipulable by the operator connected
to said arm for oscillating said shaft and swing
ing said struts and wheel to cause said struts
to lift and swing said wheel into said compart 10
ment, a rod secured to one of said bearings and
swingable about a ?xed axis at its other end, said
rod extending substantially at right angles to said
struts when the wheel is in projected position
and swinging substantially-through 90 degrees
When the wheel is swung into said compartment,
a guide for said Wheel and means carried on said
last mentioned bearing for engaging said guide.
RUFUS R. RAND, JR.
20
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