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Патент USA US2137450

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Nov. 22; 1938.-
vA. ALGREEN
2,137,450
ANTENNA FAIR LEAD
Filed April 7, 1937
INVENTOR.
A/ZEI’]A. ?regn
. B‘m- 1% M
ATTORNEY H
Patented Nov. 22, 1938
2,131,450»,
PATENT OFFIcE
- UNITED
213745931"
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3 ‘a
ANTENNA’ FAlReLEAD?
" ‘
Albert
A} ‘Green, Bridgeport," Conn; assignor'to
United Aircraft
Corporation, i East ’ Hartford,
Conn., a corporationof Delaware
\
Application ‘April 7, 1937;‘SerialN0a135A70 ‘
8 Claims.
This invention relates to improvements in an
tenna fairleads and has for an object the'pro
vision of an improved means for‘guiding a radio
antenna into and out of the fuselage or hull of
‘ ‘ an airplane.
‘A further-object resides in‘the provision in- an
improved antenna fairlead of the character
speci?ed including means extendible beyond the‘
surface of the hull or fuselage to‘prevent the
antenna from contacting the surface of the hull
or fuselage while the antenna is being reeled into
or out of the body of the‘airplane.
‘ ‘A still further object resides‘ in the provision
ina ?ying boat of an improved guide means'for
akradio antenna, said guide‘ means having a‘
water tight connection with the skin‘ or cover
portion of the boat hull and extending above the
Water line when the boat is at rest on the water.
An additional object resides in the provision‘
20 of an improved antenna fairlead which will effec-.
tively insulate the antenna from the portion‘ of
the boat through which the antenna'passeswhen
it is extended to operative position.
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‘Other objects and ‘advantages will“ be‘ more
25 ‘particularly pointed out hereinafter or will be
come apparent as the‘description proceeds.
In the accompanying drawing in which like
reference numerals are used to‘designate similar
parts‘throughout, there is illustrated a- suitable
30 mechanical embodiment of What is now con
sidered to be‘the preferred form of the‘idea of
the invention. The drawing,.however, is for the
purpose of illustration only and is not to be
taken as limiting the invention, the scope’ of
_ which is to be measured entirely by the‘scope of Y'
the appended claims.
In the accompanying drawing,
‘
i
Fig. 1 is a transverse sectional view of‘ a fragmentary portion of an airplane fuselage‘ or hull
40 showing
an improved antenna
fairlead ‘ con
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compartment and with a separatecontrol com
partment‘providing‘space for‘the pilots, ‘navi
gato-r,'-1nechanic and radio operator. As armat
terlof convenience,‘ the ‘radio antenna is located
near the radio- operator and projects through
thebottom ‘of the hull of the ?ying boat at a
location at‘the rear ‘of the control compartment,
asiis‘ clearly illustrated in Fig. 2. It ‘is to be un
derstood, however, that this location-is by Way
of exempli?cation only and that the antenna
may lead through any portion of the boat in
which‘ its location would be desirable or con
venientm
‘
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In the form‘ of the invention illustrated? the
hull‘isprovidedl at the' rear of the‘control com
partment‘withw'a transverse bulkhead vl2 secured‘
to a bottom frame M'to ‘which is securedthe
hull skin or cover l6. ,
I
‘
An3 antenna reelgenerally indicated at [8 is
mounted upon the bulkhead I2 within convenient
reach of the radio operator and from this‘reel
the antenna 20 extends through an aperture 22
provided in the bottom portion of the hull.
- Between the aperture 22 ‘and the reel I8, there
is provided an antenna fairlead or antenna guide 25
generally indicated at 24.‘
The'antenna fairlead 24 comprises‘ an outer
tubular‘ memberLZG secured at its lower end to
the‘ upper end of a ?ared or frustro-conical
member 28 by suitable means such ‘as the screw
threaded union 30. l The lower end ‘of the ?ared
member 28‘ is‘disposed at an angle to‘ the longi
tudinal axis of the member and is provided with
an annular ‘?ange 32 which overlies a portion
of the cover or skin I6 surrounding the aper
ture 22. Preferably a gasket is disposed be
tween the adjacent surfaces of the ?ange and
the‘cover‘m‘ember and the ?ange is‘securely at
tached‘to the cover member by suitable means
structed according to the idea“ of this invention
applied thereto, such portion of the fairlead be
such ‘asjthe screws 34 to provide a water-tight
connection between the lower end of the mem
ing broken away to better illustrate the cone
ber 28 and the'skin of the hull of the ?ying
struction
thereof.
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1,
‘Fig. 2 is a side elevational view‘ofvone form
of airplane to which the antenna fairlead may
be‘applied and illustrates one ‘practical position
of the antenna with relation to the body of the
airplane.
‘
a
n
p
- ‘ Referring to the drawing‘in detail,‘ the nu
meral l0 generally indicates an airplane hull
or fuselage. In the ‘illustrative construction‘
shown, the numeral ,H) indicates the hull of a
passenger-carrying ?ying boat. The type of ?y?-L
; 3 ing boat illustrated is provided with a passenger:
15
boat.‘ The union 3!) provides a water-tight con?
nectionube‘tween the lower end ‘of the tubular
member; 26‘ and the upperend of the member 28
and the‘upper end of the‘ tubular‘ member 26
extendsabove the water line when the boat’ is
at rest in the water. The guide member addi
tionally comprises an inner tubular member 36
slidably mounted in the ‘outer tubular member
26 and;,insulated therefrom by the annular in
sulating=members 38 and 40 disposed Within the»
opposite end ofthe tubular member 26, and a
locking member 42 for‘ restraining the inner
2,137,450
2
tubular member against movement with respect
to the outer tubular member.
The lower end of the inner tubular member 36
is provided with an annular ?are 44 within
which is seated a gasket 46 for receiving the
pointed upper end of the antenna weights 48.
The inner tube 36 is resiliently urged downward
ly with respect to the outer tube 26 by means of
a coiled ‘compression spring 50" surrounding a
portion ofv the inner tube and acting between the
upper insulating member 40 secured to the upper.
end of the outer tube and a collar 52 secured
antenna guide projects materially beyond the
?ush surface of the hull cover l6 and that when
the antenna is extended the weighted end there
of is guided ?rmly and smoothly through the
aperture 22 to the exterior of the hull and to
such a distance below the hull surface that the
weight 48 is entirely free of the hull and will not
slap against the surface of the hull as the antenna
is released. It will also be observed that the
antenna is completely insulated from all portions 10
of the hull.
While there has been illustrated and described
a particular constructional form of the idea of
upon the inner tube 36 within the tube 26. ,
The lock member 42 is a partly cylindrical the invention, it is to be understood that the in
member rigidly secured at its lower end to the vention ‘is not limited to the construction so
insulating member 40 and insulated from the illustrated and described, but that such changes
in the size, shape, material and arrangement of
outer tube member 26. This member extends up
wardly above the upper end of the outer‘ tube parts; may be resorted to as come within the
scope of the appended claims.
26 and is provided at its upper end with a lock
20
20 ing slot 54 adapted to receive a handle 56 se
cured to the upperend of the inner tube 36» so
that by rotating‘ the inner tube 36 the handle 56
may be brought within the, slot 54‘ and retain the
inner member in its uppermost position against
25 the. action of the spring 50. If desired, the ends
of the spring 50¢ may be attached to the tubes 36
and 26 in such a manner that torsional action
of the spring will automatically insert the handle
5.6, into the slot 54 when the antenna is fully
301
retracted.
,
>
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y
The antenna reel I6 is shown as provided with
a winding. knob 58 although it may be motor
driven, if desired, and is also provided with a
locking lever 60 so that-it may be locked to re
_ tain. the antenna in its fully retracted position
as illustrated in full lines in Fig.. 1 or at any
desired amount of;extension from the hull or
fuselage of the airplane.
f
_
When’ it-is desired to extend the antenna from
its fully retracted position, the reel lock is dis
engaged by the member 60, the handle 56 is dis
engaged from the slot 54 and rotated out of- the
slot 54 and the antenna reeled out of the air
plane. As the antenna moves. out of the airplane,
the inner tube 36 follows the weight 48v down
wardly until the lower end of the tube projects
below the bottom surface of the hull, as is par
ticularly ‘illustrated in broken lines on Fig. 1._ In
its extended position,.the inner tube 36 prevents.
the antenna. weight 48 from slapping. against. the‘
sides or bottom of the hull under the. actionv of
the air stream flowing, past the hull‘ and insures
that the antenna will fall freely from the airplane
without interfering with the hull. or becoming,
_ entangled.
When the anienna is reeled in, the upper end
of the weight 48‘ contacts the. lower end of the
extended inner tube member 36 and the force
of. the spring 50 causes. the tube. member to. sup
port. the weight 48 against movement. under the
influence of the air stream as it is drawn into the
interior of .the weight receiving, member 28.
After the antenna has been drawn completely
within the airplane and the reel i6‘ locked" to re
tain it in such retracted position, the handle '56‘
may be moved into the slot 54 to‘ remove the force
of the spring 56 from the antenna and the‘ reel.
A certain amount of tension, however, is main
tained upon the antenna so that the-upper end of
the weight 48 is retained in contact with the
gasket 46 to provide a water-tight joint between
the. weight and‘ the lower end. of'the- inner tube
member 36. From an inspection of Fig. 1, it will
be observed that when the antenna is. fully
retracted, no. portion. of. .the antenna. Ora-the:
Having now described the invention so that
others skilled in the art may clearly understand
the: same what it is desired to secure by Letters
Patent. is as follows.
What is claimed is:
1. In combination with an airplane and a radio 25
antenna extendible through a portion of the sur
face of said airplane, and provided with a weight
at the end thereof, guide means for said antenna
providing a water-tight connection between said
guide. means and the surface of said airplane, and 30
means providing a water-tight connection be
tween said guide means and said weight.
2. In combination with an airplane and a radio
antenna- extendiblethrough a portion of the sur,-_
face of said airplane, means for guiding the end
of said antenna through said surface to a posi-<
tion in which said end is clear of said surface
during the extension of said antenna, a spring
for urging said guide means to extended position
and means for removing the force of said spring 404
from the tension on said antenna when said
antenna is fully retracted.
3. In combination with an airplane and a radio
antenna extendible-through a portion of the sur
face ‘of said airplane, means for guiding said
antenna. through the surface of said airplane
comprising an outer tubular member sealed at
its lower end to the cover of said airplane, an
inner tubular member, within said outer tubular
member and a spring for projecting said inner
member to position its outer end beyond the sur
face of. said airplane when said antenna is ex
tended.
4. In combination with an airplane and a radio
antenna extendible through a portion of the sur 55
face of said airplane, means for guiding said
antenna comprising. an outer tubular member
sealed at. one. end to the. cover of said airplane,
and an inner tubular member within said outer
tubular member and insulated therefrom, resil 60
ient' means for urging said inner tubular member
to. a position in which its. outer end is projected
beyond the surface of said airplane, and means
for locking said inner tubular member in its
restricted position against the force of said resil 65
ient. means.
5. In combination with an airplane and a radio
antenna extendible through a portion of the sur
face of said airplane, means for guiding said
antenna comprising an outer tubular member 70
sealed at oneend to the cover of said airplane,
an inner tubular member within said outer tubu
lar member and insulated therefrom, and a spring
for projecting said inner tubular member to a
position. in which its outer end projects beyond
2,137,450
the surface of said airplane, said inner tubular
member being provided with a flare at its outer
end, and a gasket in said ?are for receiving said
antenna weight.
6. In combination with an airplane and a radio
antenna extendible through a portion of the sur
face of said airplane and a Weight for the end
of said antenna, guide means for said antenna
comprising a tapered member sealed to the cover
10 of said airplane and providing a receptacle for
said weight, an outer tubular member secured to
the outer end of said tapered member, an inner
tubular member within said outer tubular mem
ber and insulated therefrom and a spring for
15 projecting said inner tubular member to a posi
tion extending through said tapered member to
the exterior of said airplane.
7. In combination with an airplane, a radio
antenna extendible through a portion of the sur
20 face of said airplane, and an end weight for said
antenna, a receptacle within said airplane for
3
said end weight, an insulated antenna guide hav
ing an operative position with its outer end at
the inner end of said receptacle, and means
operative upon unreeling of said antenna to
project the outer end of said guide means out
wardly to carry said weight clear of the surface of
said airplane and hold said antenna out of con
tact with said surface.
.
8. In combination with a vehicle hull, and a
weighted line extendible through an aperture in 10
the lower portion of said hull, a tubular recepta
cle secured to said hull surrounding said aperture
and projecting upwardly in the interior of said
hull to a position above the water line, a movable
guide tube in said receptacle surrounding said 15
line, means resiliently urging said guide tube to a
position in which it projects beyond the outer
surface of said hull to maintain said line clear
of said hull surface, and means electrically insu
lating said guide tube from said receptacle.
20
ALBERT A. GREEN.
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