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APTÍR'29, 1947.
w. R. WlBx-:RG
FLEXIBLE DUCT COUPLÍNG
Filed Nov. 22, 1944r
2,419,750
2,419,750
Patented Apr. 29, i947
UNITED STATES PATENT OFFICE
,
2,419,750
FLEXIBLE DUCT COUPLING
Walter R. Wiberg, Seattle, Wash., assignor to
Boeing Aircraft Company, Seattle, Wash., a >
corporation of Washington
.
Application November 22, 1944, Serial No. 564,615
s claims. f (o1. 285-90)
1
It is sometimes desired to isolate one conduit
from a second conduit which is movable through
a small amplitude and connected to the ñrst
conduit. Resilient mountings have been em
ployed to support an internal combustion engine,
such as an airplane engine, so that it canrock,
or move slightly in otherways, relative to its
supporting structure, to reduce the vibration of
V2
incorporating my invention, parts being broken
away to show more clearly internal features of its
structure.
Figure 2 is a sectional View taken transversely
of the conduit on line 2--2 of Figure 1.
In Figure 1 of the drawing conduit sections I
and I0 are the two parts to be joined. It is pre
ferred in most instances that such sections be
of the same size and shape in cross section. While
a vehicle in which it is installed. Insuch cases
the rigid -connection of a conduit to the engine 10 both of these ducts may be cylindrical, fre
quently they are of elliptical cross section as
and to its supporting structure would largely
defeat the purpose for which such resilient
mountings are used, since considerable movement
would be transmitted from the engine to its sup
port through such conduit. Nevertheless con 15
duits are frequently necessary to convey air to
a carburetor mounted directly on the engine, or
perhaps to supply a combustible mixture of air
shown in Figure 2, and may be rectangular with
rounded corners. The same general type of con
struction may be employed for the coupling
whatever the cross-sectional shape of the ducts
to be joined may be. In fact the two ducts may
be of different shape, my joint effecting the
transition between ` them.
Because the adjacent ends of the conduit see
In installations of the type mentioned, for ex 20 tions I and II) are of the same size and shape,
an outer conduit section or sleeve 2, disposed
ample, it has been customary to insert a flexible
with its opposite ends over-lapping both of the
hose section in the conduit. While such hose
adjacent ends of the inner conduits, is utilized
sections are capable of bending to a considerable
for making the connection between them. This
degree they cannot absorb relative movement of
the conduit sections between which they are con 25 sleeve is of the same cross-sectional shape as the
ducts themselves, though larger. Each end of
nected in a direction axially of such sections.
sleeve 2 is connected to the duct section end
Moreover they are subjected to excessive hoop
which it overlies by a connecting ring of flexible
tension stresses.
material, preferably molded of synthetic rubber,
It is a principal object of my coupling to con
nect together conduit or duct sectionsïof metal 30 though for some installations it may be made of
rubber, leather or other flexible material. This
or equivalent material in a. manner which will
ring includes a substantially planar, annular web
effectively isolate one section from another sec
portion 3 extending transversely of conduit sec-l
tion which may be movable axially and tiltable
and fuel to the engine.
' .
tions I and I0 and sleeve 2, being disposed sub
to some extent. Thus the movable conduit sec
tion may, for example, be mounted directly upon 85 stantially in a plane perpendicular to the axes
of such members. In order to afford freedom of
an engine carried by resilient mountings, while
movement of the conduit sections I and III gen
the other conduit part may be secured to a sta
erally axially relative to each other, the flexible
tionary engine support. In such a connection
rings are made of material sufficiently soft to be
the flexible material is subjected to small stress.
as compared to that imposed on such material in 40 stretched radially of the ducts somewhat.
Nevertheless such rings can withstand consider
couplings of the type previously used. .
able duct'pressure, as much as 25 pounds per
A further object is to provide a coupling with
square inchr or more, because the pressure acts
such capabilities in which the flexible elements
only axially against the ring webs, which func
of the joint, made of material such as synthetic
rubber, may be secured positively in place with 45 tion as annulardiaphragms. Under pressure the
webs of the connecting rings will therefore be
out the aid of adhesives, if desired.
bowed outward slightly, as shown in the upper
An additional object is to provide such a cou
portion of Figure 1.
pling which is of simple construction, which can
Various constructions of the duct sections and
be utilized with conduits of different cross-sec
50 of the sleeve ends may be utilized to retain the
tional shapes and which'can be installed easily.
connecting rings in place, such rings being Vof
The flexible structure may take forms different
from that shown in the accompanying drawing,
which is the constructionpreferred for «reasons
appropriate shape to cooperate with such duct`
and sleeve ends. Since the material of the con
necting rings, being highly ñexible, is quite soft,
Figure 1 is a side elevation View of- a coupling 55 however, it is preferred that these rings be
which will be pointed out-hereafter.
2,419,750
3
4
molded in H-shape cross section. It is not essen
tial that these elements be molded in ringform,
' but a straight strip may be molded of such cross
section, and then a piece of appropriate length
may be looped and its ends cemented together to
form a ring of the desired size.
minum, soft enough to be bent reversely to form
the groove 23 embracing the flange 3|, but if not,
the edges of each of these strips may be notched
at intervals before being bent inwardly, to form
such groove by tabs engaged under the connect
ing ring flange 3|. This flange is thus held in
Each ring, therefore, will include a flange 30
such manner that it cannot be displaced from
integral with its inner _periphery andv projecting
sleeve- 2` by stresses acting. on web 3 :in either
in oppositedirections from the web axially ofr
direction axially of the sleeve or radially inward
the ducts. Similarly an outer flange 3| integral l0 of the sleeve.
with the outer periphery of the web 3 of each
` While it is preferred that the connections be
ring projects in opposite directions from the web
tween both'ends of sleeve 2 and duct sections I
axially of sleeve 2. By providing a duct and
and I0, respectively, be resilient, sufficient ilexi
sleeve end structure embracing closly these innerl
bility-may: be imparted to the joint in many cases
and outer iiange portions of each connecting ring` 15 by making only one» of such connections yield
the rings will be held positively in place.
able, Likewise,> in connecting a large duct to a
A convenient retaining structure for such a
smaller one of similar cross-sectional shape, only
connecting ring is formed by bending the end
one resilient connecting ring would be employed.
The particular proportions of the web 3 and
of each inner conduit section I and IG outwardV
and then backward over.` the respective conduit 20 ñanges 30 and 3| of the flexible connecting rings
to form an ,annular groove II of a widthV and
are` not> critica1,_ but the` ring web should be of
depth such that the portion, of a ring’s inner
sufficient Width. to ,allowr reasonable `axial or tilt
flange 30 projecting beyond one side of webV 3
ing;. movement between. ducts. The ñanges of
willfit snugly in it. If the material of. which
the, connecting; rings »_ should project far enough
conduits I and II) are made'is suñiciently mal 25~ beyond- the opposite sides of their webs to alford
eable, such `as aluminum, it may be possible to
a goo,d;grip; on> them at each side'of the web by
spin over the end o1?` the duct, accompanied by
the. structure described,
stretching of theconduit material.
Such.. structure was` designed to avoid` sheet
If the metal of the duct is not sufliciently mal
edges being located within eithery of the conduit
eable to enable this operation to be performed
sections land I,0,_or sleeve 2. As an alternative
without splitting the end, however, cuts may be
constructiomhoweventhe body of either or both
made in the end of each conduit section at inter
of conduit sectionsJ and. I0 couldrbe offset out»
vals aroundits periphery, and the tabs formed
ward in the shape of strips I2, corresponding to
intermediate such cuts may be bent reversely in
thel inward offset'20 of: sleeve 2. The groove- II
the manner shown to form the groove || for re
in each instance` could then. bev formed `by a sep
ceiving one portion of the inner flange 3B `of each
arate strip;Í corresponding to strip 2| secured
connecting ring. Alternatively the outer element
to,sleeve,.2~. In thatcase the edge ofV each such
may be formed separately as. aring. andjoined
strip wollld'bexlocated,inside. its corresponding
to the conduit end at the bottom of groove II
duct section, which is 1ess_.desirable than-the ar
by Welding or equivalent process.v
40,2 rangementl illustrated in the drawings and de
To embrace `and retain the portion of each
scribed above.
connecting ring flange 3|) on the opposite side
Similarly, vprior toinstallation of sleeve12 over
of its web, remote from the end of the conduit
the adjacentends of-duct sections | and |0„the
which the ring engages, a strip.|2, offset radially
iianges> 3| ofw the_„connecting, rings could, beÍ re
to contact the. outerY surface of suchV connecting
ceivediimgrooves 23 formed by the edges >of sleeve
ring iiange portion, may encircle and embrace
2. turned=;inward.` The offset portions 20 of the
closely` the exterior of. each conduit section I_and
sleeve end conldbe replaced by a strip corre
I0. These strips maybe held in place by securing
sponding to the strips I2 encirclingvconduit sec
members I3 extending through them and the
tions; |` andl I0.
,
duct wall, which may be rivets, as shown, or bolts,
These> possible` constructions are suggested
sheet metal screws, or otherV type ofA intercon
merely toillustratefthat.anumber of variations
necting elements. Despite the highly flexible
could be made in the.,ring» retaining structure
character of the connecting ring, therefore, it
shown inthe drawing while attaining the> same
will be- evident that flange 3|]r cannot escape from
generalv results. more i» or `less satisfactorily, al
the end of its respective duct under the applica
,p thoughthe assembly,V of: the couplings is facili
tion of a force in either direction axially of: the
tated> bythe _,preferred. construction.
duct or outwardly radially of the duct, whether
In> installing. the coupling a connecting ring
created by relative movement of the duct sections
maybe placed overrone oiduct sections I and I0
or by fluid pressure Within the duct acting
andi connected; to:-it.by:application of» strip I2,
against the ring’s web, or under a combination 60 and.- to_«,s1eeve; 2. lbysecllring ¿the appropriate strip
of such forces.
The end of sleeve- 2 in each instance may be
offset inward to form a ledge 2B ñtting within
the adjacent portion of the outer ring flange 3|,
the exterior of the flange being flush with the
outer periphery of sleeve 2. The portion of the
flange 3| of each connecting ring at the side of
its web remote from sleeve 2 may» be'embraced
by a metal strip 2| secured by rivets 22, or equiv
alent securing members, to the_sleeve in con
tiguous engagement with it. The free edge of
this- stripis bent inward to form a groove 23 in
which such portion of each connecting ring ñange
3|
ñtsi snugly.
~
~
>
'
The strips 2| may be of material, such as‘alu
'
2| in placa-lbeforesections I and I0 are secured
intheirpdesiredï relationship. Flange L3| of the
other- connecting.: ring may; then be secured to
sleeve 2;
Conduit ¿sections |4 and Il) may now
be arranged. in the: desired relationship, the
section not attachedltosleeve 2-being inserted
throughthe unsecured inner flange 30` of the
connecting-ring'carriedby sleeve -.2. Such ring
flangeiis; then: inserted. in its` groove I I, and strip
_ I2 isapplied‘to-anchor such flange.
Insome instances 4wherethe relative movement
of sleeves | and I0“is.not,great or violent, and
the iiuid pressureiwithintheduct is slight, one
or both of flanges130zand 3| vof the connecting4
75'. ring may project- beyond only one side of the
6
5.
web 3. The ring might thus be molded of channel
opposite directions therefrom substantially ax'if
or Z` cross section, or otherwise formed to afford ‘
if the flanges Vof, such a strip are merely to ,be
ally of said inner conduit section, said inner
ñange substantially corresponding `to said innerv
conduit section in shape and being disposed ad
marginal inner and outer portions to lbe secured.
conñned, however, a more positive grip is insured
jacent .to the end thereof, and an outer ñange
when they project axially to some extent at least
beyond both sides of web 3, although the pro
jecting portions of the ñanges at opposite sides
integral with the exterior periphery of said web
and projecting inopposite directions therefrom
substantially axially of said outer conduit
of the web need not be of equal width. Alter
natively the flanges of the connecting rings can
be bonded to the duct sections, even if the rings
section, said outer ñange substantially cor->
responding to said outer section in shape and
are of channel or Z cross section.
In fact the
ring flanges may be omitted and the web itself
may be bonded to the tube parts, particularly if
a flange is turned outward on the inner tubular
member and a flange is turned inward on the
being disposed „adjacent to the end thereof,
means securing said outer ñange of said con
necting ring to the adjacent end of said outer.`
conduit section, and means .securing said inner
Y iiange of said connecting ring to the adjacent end
l of said inner conduit section, the overlapping end
of said cuter conduit section being constructed
_
to embrace and substantially enclose the portions
When the ends of the ducts l and lil to be
of said outer connecting ring flange at 'both sides
joined are not of the same size and shape, the
sleeve 2 constitutes a transition piece. Each end 20 of the connecting ring web, and the end of said
inner conduit section being formed to embrace
of such sleeve in such instance should correspond
and substantially enclose the portions of said
substantially in shape to the duct end which it
inner connecting ring flange at both sides of said
encircles, but should @be somewhat larger than
outer tubular member.
such duct end.
Y
l claim as my invention:
connecting ring web.
4. A conduit joint, comprising two conduit
sections of substantially the same cross sectional
l. In a conduit joint, an outer conduit section,
size and shape and having adjacent ends of
an inner conduit section disposed substantially
such sections spaced apart a substantial distance,
concentrically within said outer section, a con
an intermediate conduit section larger than said
necting ring including an annular web of resilient
material, an inner edge portion integral with the 30 ñrst two conduit sections in cross section but
similar thereto, and of a length to overlap both
inner periphery of said web and projecting there
the adjacent ends of said first conduit sections,
from axially of said inner conduit section and
being disposed adjacent thereto, and an outer
edge portion integralv with the external periphery
of said web and projecting therefrom substan
tially axially of said Outer conduit section and
,being disposed adjacent thereto, and each conduit
section having a sheet metal portion folded back
and two connecting rings of resilient material
substantially H-shape in cross section, forming
f in each an annular web disposed substantially
perpendicular to the axis of said intermediate
conduit section, an inner ñange integral with
the inner periphery of said web and projecting
upon itself to form a trough closely embracing
in opposite directions ` therefrom substantially
2. In a conduit joint, an outer conduit section
and an inner conduit section arranged substan
corresponding one of said first conduit sections
in shape and being disposed adjacent to the end
thereof, and an outer flange integral with the
exterior periphery of said web and projecting in
opposite directions therefrom substantially axi
the corresponding adjacent edge portion of said 40 axially of its respective first conduit section, said
inner ñange substantially corresponding to the
connecting ring.
v
tially concentrically, havin-g adjacent overlapping
ends of similar shape, and a connecting ring of
resilient material substantially H-shape in cross
section forming an annular web disposed sub
stantially perpendicular to the axis of said outer
ally of said intermediate conduit section, said
outer ñange substantially corresponding to said
intermediate conduit section in shape and being
conduit section, an inner flange integral with
the inner periphery of said web and projecting 50 disposed adjacent to the corresponding end there
of, means securing the outer flange of each of
in opposite directions therefrom substantially
such connecting rings to the respectively ad
axially of said inner conduit section, said inner
jacent end of said intermediate conduit section,
flange substantially corresponding to said inner
and means securing the inner iiange of each of
conduit section in shape and lbeing disposed adja
such connecting rings to the adjacent end of the
cent to the end thereof, and an outer flange
respective first conduit sections.
integral with the exterior periphery of said web
5. In a conduit joint, a sheet metal conduit
and projecting in opposite directions therefrom
section, a member adaptedl to be connected to
substantially axially of said outer conduit section,
said conduit section, a connecting ring including
said outer flange substantially corresponding to
said outer section in shape and ‘being disposed 60 a web of resilient material having iianges pro
jecting oppositely from one edge of said web,
adjacent to the end thereof, means securing said
outer flange of said connecting ring to the adja
said conduit section having two sheet metal flange
portions overlapping said ring ñanges and coop
cent end of said outer conduit section, and means
securing said inner flange of said connecting
erating with said conduit section to inclose said
ring to the adjacent end of said inner conduit 65 flanges, and means securing the edge of said con
section.
necting ring web remote from said flanges to said
3. in a conduit joint, an outer conduit section
member.
6. In a conduit joint, a sheet metal conduit
tially concentrically, having adjacent overlapping
section, a member adapted to be connected to said
ends of similar shape, and a connecting ring of 70
conduit section, a connecting ring including a
resilient material substantially H-shape in cross
web of resilient material having flanges project
section forming an annular web disposed substan
ing oppositely from one edge of said web, the
tially perpendicular to the axis of said outer con
end of said sheet metal conduit section being
duit section, an inner flange integral with the
inner periphery of said web and projecting in 75 folded back upon itself to form a sheet metal
and an inner conduit section arranged substan
2341x2756
El'
trough' closelyf embracing" one ñanger of` said* cnn
Number
nectirìg ringV and means securing ` the »other‘
251925395
ñange off said connecting ring> to- said> conduit
section.
1:»,4f13:,173f
11,791,711
1,853,156`
138711,1883»
WALTERv R. WIBERG;
REFERENCES CITED
vThe fòllowing references are of record in the
ñle of this patent:
1,884,374
13,983,106
2§242§582
10:
UNITED STATES PATENTS
Number
315,387
1392351.24
Name
Hobart __________ ____ Apr. 7, 1885
Stanley ____ ____ ____Aug. 22, 1933y 15;
_
Dàte
’ La~Böur ____ _ _-_~____ _ _4 Mar;- 5,.1'940l
Brinkerhoîtî ______ ___ Nov; 6; 1923'
YDeVito' ____ __i ____ __ Feb. 10,--1931
SQbon-_ _______ __„____. Apr.»12¿11`932`
Geyer ____________ __«Aug.~16,>1932
'fatter` ___ ________ __ Oct-25», 19321
Sundstromr ________ __ Dec.ì4,-1934
» Jenoìck __________ __ May 20; 1941
FOREIGNv PATENTS
Number;
Date
Namey
10,199
55,1604`
Country
Date»
vBritish _____________ _ Apr. 30,1912
Switze‘1'1and-v________Sept. 22,.,1910r
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