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Jan. 7-,1947.
K. H. EVE'RT
2,413,816
MEANS FOR MAKING FLEXIBLE METAL HOSE
Original Filed June 16, 1941
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Jan. 7, 1947.
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K_. H. EVERT
MEANS FOR MAKING FLEXIBLE METAL HOSE
Original Filed June 16, 1941
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MEANS FOR MAKING FLEXIBLE METAL HOSE
Original Filed June 16, 1941 _
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Patented Jan. 7, 1947
2,413,316
UNITED STATES PATENT QFFICE
2,413,816
MEANS FOR MAKING FLEXIBLE METAL
HOSE
Karl H. Evert, Elmhurst, Ill.
Original application June 16, 1941, Serial No.
398,272, now Patent No. 2,313,329, dated March
, 1943.
Divided an d
this application January
9, 1943, Serial No. 471,863
1
12 Claims.
The present invention relates to means for
making ?exible metal hose or metallic ?exible
conduits.
Metal conduits or hoses of this type are formed
from preformed metallic strips helically wound
in a suitable rotating device whereby the ad
jacent edge portions of the convolutions of the
strip are joined, as by brazing or otherwise, to
effect a seam.
The ?nished conduit is longitu~
(Cl. 219-6)
the base of the trough between the adjacent con
volutions, that is, adjacent to the surface of the
mandrel. This welding forms a continuous seam
between the overlapping ?anges and for the full
Width of the overlapping portions of such flanges.
The invention also comprehends as a part
thereof the provision of novel means for gather
ing the convolutions, that is, spacing the coils
or convolutions closer together for the ?nished
10 pro?le of the coil or conduit fed from the mandrel.
The present invention comprehends a novel
dinally corrugated in shape.
This novel means comprises a roller or rollers
device for producing a novel metal hose or con
which stress the coils or convolutions to make
them gather closer together. In doing so the
outer diameter is increased, the inner diameter
dui .
I run the strip of metal through a suitable
forming or pro?ling device, not speci?cally 15
remaining the same, that is, approximately that
shown, so that the strip is formed with a U
of the outside diameter of the mandrel.
shaped pro?le with laterally extending edge
Other objects, advantages, capabilities, fea
?anges at the open end of the U, and also gener
tures, and the like are comprehended by the in
ally curving the pro?led strip to approximately
vention as will later appear and as are inherently
the curvature of the mandrel upon which the pro 20 possessed
by the invention.
?led and curved strip is to be wound.
This is a division of my copending application
Then, according to my invention, the strip
Serial No. 398,272 ?led June 16, 1941, now Patent
passes between one or more novel rollers and
No.
2,313,329, issued March 9, 1943.
the novel mandrel, the latter being a smooth sur
Referring to the drawings:
faced cylindrical mandrel free of any projections 25
Fig. 1 is a conventional side view of a machine
or ribs or the like, along which smooth surface
embodying the invention;
_
_ the coils or convolutions of the conduit will slide.
Fig. 2 is a transverse view, on an enlarged scale,
The roller or rollers are so located as to posi
with parts in section, of the invention;
t1on the adjacent convolutions in given spaced
relation whereby the adjacent ?anges will over- '
lap for joining. These ?anges are at the base
of the helical trough formed between the con
volutions, and located against or adjacent the
smooth cylindrical surface of the mandrel, pref~
erably at the locus of ?rst contact of the pro
?led strip with the mandrel as the strip initially
becomes associated with the mandrel.
Other rollers may be used and located at di?er
ent points around the mandrel So as to guide
the movement of the convolutions around the
mandrel. These rollers may be spaced from the
mandrel so that the convolutions will not touch
the mandrel but will spacedly encircle it. In
such case the axial movement or feed of the
Fig. 3 is a fragmentary side view, on a. further
enlarged scale, of the invention;
Fig. 4 is a diagram showing the advantage of
welding an inner seam;
Figs. 5 and 6 are fragmentary sectional views
of different kinds of rollers used in the invention;
Fig. '7 is a fragmentary and transverse sectional
view taken in a plane represented by line ‘5-4!
in Fig. 1 of the drawings;
Fig. 8 is a fragmentary part sectional and part
side view developed from planes represented by
lines 3-8 in Fig. 7 of the drawings;
Figs. 9, 10, ll, 12 and 13 are fragmentary sec
tional views of different types of rollers used in
the invention;
Figs. 14 and 15 are part transverse views and
convolutions relative to the mandrel will be 45
part end views of the invention showing the novel
means for driving the rollers about the tube; and,
nor resistance.
Fig. 16 is a fragmentary view for illustration
Preferably, one of the discs, such as the lead
of the drive means for a roller.
greatly facilitated, with practically no friction
disc, is designed to weld the overlapping adjacent
flanges. By welding at a point where the pro
?led strip initially contacts the mandrel then the
convolutions are ?xed in relation and will turn
about and slide along the mandrel as a single
unitary corrugated tube.
Referring more in detail to the drawings, for
50 illustrating the invention, the preformed or pro
?led strip l is helically wound upon a mandrel 2
having a smooth cylindrical outer surface upon
which the strip is wound and along which the tube
slides axially to be fed off to a take-up means.
An important novel feature is the welding at 55
The mandrel is axially stationary but preferably
2,418,816
3
ing device passes to the mandrel the ?rst roller
rotates at the same or faster angular speed as or
or rollers will correctly position or direct such
than the tube, yet the invention comprehends
the use of a mandrel which may not rotate.
convolution axially relative to the previously
In
formed convolution; the second and third rollers,
as rollers la and 8, will‘ hold such adjacent con
the latter case as the tube turns over the mandrel,
there would be a little more friction between the
tube and the mandrel but that would not be sui
in
volutions properly spaced, and the fourth roller,
as roller 9, will guide the convolutions into their
helical paths for axial feed of the tube along the
?cient to affect the e?icient production of the
tube in accordance with my invention. Suitable
mandrel in the direction of the arrow shown in
lubrication can be used between the mandrel and
10 Fig. 3.
the tube if desired or found necessary.
One of these rollers may be a welding roller,
The tube is made from metal strips, such as
such as roiler ‘in. In such case the body of the
stainless steel, or the like, The strip is forced
roller 'willbe composed of electrically insulating
through any suitable preforming or pro?ling de
material and will include a central metal or car
vice (not shown) to give therstrip the desired
15 ,bon disc i2 (see'Fig. 6) constituting one of the
cross-sectional form or pro?le,.and.-longitudinal
‘welding electrodes, for conduction of the electri
curve to wind around the‘mandrel.
‘cal energy for welding at the periphery i3 while
In the present invention it is preferable to pro
applying pressure to the ?anges 5 and ii, the
?le the strip in U-shape with the bendof the
mandrel i constituting the other of the welding
U forming the outer crest 3 of the strip, and with
the legs of the U formed with lateral flanges d and 20 electrodes.
The rollers may be or" the form' shown inFigs.
5 which when united constitute apart of the
i0 and 11, which are useful when working‘with
inner trough between adjacent convolutions of
strips having high altitude convolutions. In
the pro?led strip‘when helically wound on' the
this case each roller may have a pair of grooves
mandrel 2. As the strip is helically wound on
the mandrel one'of'the ?angessuch as flange 25 H5 and to with “an intermediate annular
pressing periphery it for functioning in the
it, will lie in contact with the surface of the man
trough between adjacent convolutions for main
drel, as at the top, as shown, and the other'?ange,
taining proper spacing or spread and for press
such as ?ange 5 of the succeeding convolution of the
‘1mg the'?anges thereor?'and with lateral rims H
the‘ adja
.strip, will lie upon-and in contact‘ with
I
‘cent ?ange A of the preceding convolution of the ‘0 and it so spaced as to span the adjacent convolu
tions, and to contact‘the opposite remote sides
strip, These overlapping'?anges' are‘welded to
of the adjacent convolutions, as shown in Fig. 10.
gether as hereinafter described.
By such means the pro?le of the convolutions is
It is preferable tohave these ?anges'overlap
along a narrow width where the welded seam is
produced so that there will be no ?ssure between
the overlapping‘ portions of the ?anges on either
or both sides of the‘ welding trace, and also for
economy wherein strips of'less width may be used
than was‘heretofore required, when bonding by
solder or by brazing.
The strip is helically wound upon or about the
‘ outer cylindrical surface of the mandrel as the
strip is fed out of'the preforming or pro?ling de
vice and moved in between the mandrel and a
series of rollers I, ‘la, 8 and 3 (conventionally
shown in Fig. 2) having suitable pro?led periph
eries'conforming to the inter-pro?les of the con~
volutions of the strip. These rollers are rotatable
about respective axes generally parallel with the
axis of the mandrel and the tube but normal to
the circumferential portions of the convolutions
contacted thereby, and are distributed around
maintained, beside keeping themproperly spaced
for the welding function to be performed.
Any of these rollers may act as the welding
_ electrode. In such case thebody of the roller
serving as the welding electrode (see Fig. 11)
will be made of electrically non-conducting ma
40 terial i9, and include a centra1 metalor carbon
disc 2!} to- carry the currenigthe welding being
effected at the periphery 2| of such disc.
In the case of using the type of roller shown in
Fig. 11, in such a position as shown at la in Fig.
Cl 2, the use of other rollers atipositions '8 and 9
in Fig. 2 would not be necessary; ecause the roll
er at position la would perform all‘ the functions
of maintaining the relation of theadjacent con
volutions, and welding themtogether by .way of
their adjacent overlapping ?anges. However, be
cause the tube wouldbe usually larger than the
mandrel, the use of rollers 3 ands would be use
ful to hold the tube substantially, coaxial vor cen
tral with the mandrel. ‘After the strips are weld
ed they will wind or turn about the mandrel to
gether as a unit. ‘All that would be necessary
when starting the winding of the strip would be
to direct, in any suitable manner, the initial end
of the pro?led strip intov a curved path around
These rollers may be of simple form as shown 60 the mandrel for the ?rst convolution to the point
where it becomes welded to the next convolution.
in Figs. 2, 3 and 5, preferably composed of in~
I the mandrel, besides being-progressively axially
spaced in accordance with the pitch of the heli
cally wound strip. These rollers are principally
for holding the convolutions of the strip properly
spaced, and for pressing against the overlapping
?anges ii and 5 to e?ect a correct welding of such
?anges, as later explained.
sulating material (although that is not wholly
ecessary) more or less in disc form and with a
tapered periphery id, to easily enter between con“
volutions of the strip, and for pressing periphery
ii, The thickness of these rollers gauges the
spread or spacing of such convolutions. The pe~
riphery ii of the roller l‘ presses against the
flange ii- to hold it in contact with the mandrel,
and. the periphery ll of the roller ‘5a presses . -
against the overlapping flange 5 to hold it in good
contact with the underlappinv ?ange d and the
surface of the mandrel i.
The axial spacing of these rollers is'such that
as the entering convolution from the 'preforrn- ‘
After that the strip will wind perfectly about the
mandrel as the adjacent convolutions which are
welded together proceed in‘ helical path from the
point of welding.
The welding is eii'ected electrically between the
contacting points of the rotary electrode and the
mandrel.
The desired number of electrical en
ergy impulses for‘agiven unit'of length of the
line of welding or welding trace may be used.
This relation may be'so'chosen that the weld
ing “spots” will so overlap that there willbe a
substantially continuous welded seam between
the ?anges 5 and 13 whereby the tube will be fluid
tight, and the width‘of the welded seam will be
5
2,413,816
su?icient to avoid ?ssures between the ?anges
at the edges of the ?anges.
If it were assumed that the welding took place
6
be weak then the rollers 22, 23 and 24 may be of
the form as roller 2'! shown in Fig. 9, which roll
er has compressing and supporting rims 28 and
29 at each side of the convolution to be axially
compressed.
It is preferable that the rollers be driven. In
Fig. 14 is shown means for driving the rollers
as shown in Figs. 2 and 3, and in Fig. 15 is shown
along the helical line of the crest 3 of the con
volutions with impulses of the value 2' for a given
unit it of length along such line, the weld spots
would be equal to 1' times u. Assuming the di
ameter D of the tube at the trough to be 2a and
the diameter D’ at the crest 3 to be 3a, the cir
means for driving the rollers as shown in Figs. 7
cumference C of the former would be 26611' and 10 and 8. In both cases the drive means is of gen
the circumference C’ of the latter would be 3cm,
erally annular form to surround the rollers to be
or in the proportion of 2 to 3. Hence, by weld
driven and to be clear of the tube and the man
ing along the helical trough line instead of along
drel.
the helical crest line, the work can be speeded
In both cases the driving means is shown as
up 50%. That is, for obtaining in spots along 15 having an annular driving ring 2? having inner
the helical trough line per unit of time the tube
teeth 28 and rotatably supported between rollers
can be rotated 50% faster and fed on“ the man~
or idlers 2B. Meshing with the teeth 28 are spiral
gears 30 (see particularly Fig. 16) ?xed to shafts
this kind of work is immense and not a matter
3! leading and secured to rollers ‘I, ‘la, 8 and 9
that would be apparent from the methods and 20 (see Figs. 14 and Figs. 2 and 3) and to rollers 22,
means previously used.
23 and 24 (see Figs. r7 and 8, and Fig. 15). The
As the pro?led strip is wound on the mandrel
annular gear 21 may be rotated by a suitable driv
2 it travels in screw-fashion, that is, the tube
ing gear 32. The shafts 3i are at an angle to
rotates about the axis of the mandre1 and also
the axis of the annular gear 2'! and at a normal
progresses axiallydn proportion to the pitch of 25 to the convolutions to be acted upon by the roll
the helical form of the convolutions and the speed
ers ‘I, la, 8 and 9, and 22, 23 and 24 as the case
of rotation. This may be called the “feed-off”
may be.
from the rolls.
As the tube now feeds off it may be taken-up by
drel 50% faster. To increase production 50% in
The strip may have tWo or more U-shaped por
a suitable take-on device and wound on a suitable
tions between the side ?anges. In Fig. 12 the 30 wind-up spool or reel.
strip is shown with two U-shaped portions to
While I have herein described and upon the
and 3b between the side ?anges 4a and 4b, and in
drawings shown illustrative embodiments of my
Fig. 13 the strip is shown with three U-shaped
invention it is to be understood that the inven
portions 3a, 3b and 30 between ?anges 4a and
tion is not limited thereto but eomprehends other
4b. In such cases rollers lb and lcfor guiding
constructions, arrangements of parts. details, fea
and placing the convolutions would be used as
tures, and the like, without departing from the
shown in Figs. 12 and 13. The disc part of
spirit of the invention.
such roller pressing the adjacent ?anges db and
Having thus disclosed the invention, I claim:
4a together would act as the welding roller to
1. In a machine for forming a ?exible tube
weld such ?anges together.
40 from a preformed bendable Weldable strip un
The disc electrodes shown in Figs. 6 and 11,
dulated in transverse section to include a crest
corresponding to the disc electrode |2a shown in
and opposed wall portions and also including
Figs. 12 and 13, may have an enlarged rim iZb
?anges projecting laterally outwardly respective
as shown in section in Fig. 12. Any or all of
ly from the unclosed edges of said wall portions,
the electrodes may use such rim when and where in. ;Vl a rod-like mandrel having a free smooth cylin
desired. In such case the sides of the peripheral
drical surface, means for feeding said strip gen
portions of the rollers will be more sharply ta
pered or bevelled so as to leave sui’?cient insu
erally transversely of and tangentially onto said
smooth surface of said mandrel with the strip
lating air spaces at both sides of the enlarged rim
crest
portion radially outermost therefrom and
82b. See Fig. 12.
50 the ?anges thereof upon said surface of the man
Along the feed-oil? path of the tube it is desira
drel, and guide means for guiding said strip into
ble to compress the convolutions. See Figs. '7 and
a spiral formation about and upon said surface
8. This may be effected by the use of compressing
of said mandrel with one flange of each convolu
rollers 22, 23 and 213. These rollers may be of the
tion in overlapping relation with the other flange
general form shown in Fig, 3, but thinner and 55 in the next preceding convolution upon said sur
more closely axially spaced. They also are pref
face of said mandrel, said guide
including
erably rotatable on axes, which are at a normal
guide roller means including disc-like portions
to the convolutions being compressed, and are
rotatable about axes directed generally length
suitably arranged angularly about the tube,
wise or” the mandrel but diagonally thereof, said
whereby two adjacent rollers may have overlap 60 disc-like portions being spaced lengthwise of the
ping portions between which a convolution of the
mandrel with edge portions proximate thereto to
tube may be axially squeezed or compressed.
engage with the opposed wall portions of a plu
As for example, when convolution 25 passes
rality of said convolutions for controlling their
between rollers 22 and 23 it is given a decreased
spacing axially of the mandrel and hence the
axial dimension and increased outward radial di 65 pitch of the spiral formation and for pressing
mension, as shown in Fig. 8. When the convolu
against said overlapped flanges to hold the lat
tion 26 passes between rollers 23 and 24, it is
ter against said surface, and electrode means in~
further decreased in axial dimension and in
eluding said mandrel for welding the overlapping
creased in outward radial dimension, as shown in
?anges together While said ?anges are held
Fig. 8. More rollers may be used to still further 70 against said surface of said mandrel.
compress the convolutions and increase their
2. In a machine for forming a flexible tube
"outer diameters. The inner diameter of the con—
from a preformed bendable strip generally un
volutions remains the same because of the trough
dulated in transverse section, a rod-like mandrel
portions bearing on the surface of the mandrel 2.
having a free smooth cylindrical surface, and
If the metal used is thin and has a tendency to 75 means for guiding and shaping the strip heli
2,413,816
cally onto and about said smooth surface of the
mandrel comprising a plurality of roller mem
bers having disc portions distributed along a
path directed helically about said mandrel, said
8
the unclosed edges of said walls, a rod-like man
drel, and guide means for guiding said strip into
a spiral formation about said mandrel with the
strip crest radially outwardly and with one ?ange
of each convolution in overlapping relation in
given extent less than the width of the ?anges
with the other ?ange on the next preceding con
volution, said guide means including guide roller
disc portions being disposed with circumferen
tial edge portions thereof proximate to the said
free smooth periphery of said mandrel at their
respective positions in the helical path and with
means including disc-like portions spaced axially
side portions thereof for contacting opposite sides
10 of the mandrel and with peripheral edge portions
of the helically wound strip to control the spac
proximate to the mandrel and their principal axes
ing of the convolutions thereof, and means for
directed generally axially of the mandrel but
rotating said members about their principal axes
diagonally
thereof whereby said disc-like portions
in the direction to advance said circumferential
engage
with
opposed side wall portions in a plu
edge portions in the same direction with respect
rality of said convolutions, said disc-like portions
to said path.
being su?iciently close to the mandrel to engage
3. In a machine for forming a ?exible tube
and press the overlapping flanges between their
from a preformed bendable weldable strip un
peripheral edges and the mandrel and being ro
dulated in transverse section to include opposed
tatable to advance the spiral formation screw
wall portions, a crest bridging such wall portions
like about and along the mandrel, and at least
and ?anges projecting laterally outwardly re
one of said disc-like portions comprising an elec
spectively from the unclosed edges of said Wall
trode element including an annular portion ex
portions, a rod-like mandrel having a free smooth
tending about the periphery thereof to contact
cylindrical surface, and guide means for guiding
said strip into a spiral formation upon and about
said smooth surface of said mandrel with one
?ange in each convolutionin overlapping rela—
tion with the other ?ange in the next preceding
convolution and upon said free smooth cylin
drical surface of said mandrel, said guide means
including means for projecting inwardly of said '
one of the overlapping ?anges, and a layer of in
sulating material about the sides of said electrode
element to prevent contact thereof with the side
Walls of the strip.
7. In a machine for forming a ?exible tube
from a preformed bendable weldable strip un
dulated in transverse section to include a crest
and opposed side Walls and also including ?anges
convolutions to engage the strip side walls therein
projecting
laterally outwardly respectively from
for preventing simple axial movement of the
the unclosed edges of said walls, a rod-like man
formation but to cause screw-like advancement
drel having a smooth cylindrical surface, and
thereof when the same isrotated about the man
guide means for guiding said strip into a spiral
drel, and a guide roller disposed with a diametric 35
formation about said surface of said mandrel
element generally perpendicularly to the man
with the strip, crest radially outwardly and with
drel, said roller having an end wall adjacently
one flange of each convolution in overlapping re
to the mandrel and in a plane diagonal there
lation with the other ?ange on the next pre
to in opposed spaced relation with said inwardly
ceding convolution, convolution compressing
projecting means axially of the mandrel to guide
means including a plurality of compressing roll
said strip onto the mandrel in position to add
ers having disc-like portions spaced variantly
onto the last-formed convolution While said in
axially of the mandrel and with peripheral por
wardly projecting means stabilizes the formation
tions extending at opposite sides of the convolu
on the mandrel.
tion at such axial distance apart as to axially
4. In a machine for forming a ?exible tube
compress and axially bodily move the portion of
from a preformed bendable strip undulated in
the convolution between said peripheral portions
transverse section to include a crest and opposed
for reducing the Width of the convolution and in
side walls, a rod-like mandrel having a free
creasing its diameter and for gathering the con
smooth cylindrical surface, and means for guid
volutions in closer proximity.
ing and propelling said strip helically onto and
8. In a machine for forming a ?exible tube
about said smooth surface of the mandel, com
from a preformed bendable weldable strip un
prising a roller having a groove circumscribing
its circular periphery, said roller being disposed
with such periphery adj acently to the mandrel to
press said strip upon said free smooth surface.
of the mandrel and with its principal axis slightly
diagonally of the mandrel to place a portion of
the roller groove in position to receive the crest
dulated in transverse section to include a crest
and opposed side walls and also including ?anges
projecting laterally outwardly respectively from
the unclosed edges of said walls,‘ a rod-like man
drel having a smooth cylindrical surface, and
guide means for guiding said strip into a spiral
formation about said surface of said mandrel
and side Walls at a portion of such a strip di
with the strip crest radially outwardly and with
rected helically upon and about the mandrel, said 60 one ?ange of each convolution in overlapping
roller being rotatable about its principal axis,
relation with the other ?ange on the next pre
and the side wall of the groove therein being
ceding convolution, convolution compressing
adapted to grip the strip side wall portions there
means including a plurality of compressing roll
in wherefore to advance said strip helically about
ers having disc-like portions spaced variantly
the mandrel pursuant to such rotation.
axially of the mandrel and with peripheral por
5. The combination set forth in claim 4, but
tions extending at opposite sides of the convolu
wherein the roller contains a plurality of such
tion. at such axial distance apart as to axially
peripheral grooves axially spaced a distance to
compress and axially bodily move the portion of
receive strip side wall portions in adjacent con
the convolution between said peripheral portions
volutions of the helically formed strip.
for reducing the width of the convolution and in
6. In a machine for forming a ?exible tube
creasing its diameter and for gathering the con
from a preformed bendable weldable strip un
volutions in closer proximity, and driving means
dulated in transverse section to include a crest
for driving said compressing means.
and opposed side walls and also including ?anges
projecting laterally outwardly respectively from 75
9. In a machine. for forminga ?exible tube
9
2,413,816
from a preformed bendable weldable strip of heli
cal form and having an undulated transverse
section to include a crest and opposed wall por
10
ical form and having an undulated transverse
section to include a crest and opposed wall por
tions and also including ?anges projecting later
tions and also including ?anges projecting lat
erally outwardly respectively from the unclosed G1 ally outwardly respectively from the unclosed
edges of said wall portions; a cylindrical man
edges of said wall portions; a cylindrical man
drel about which said preformed strip is fed with
drel about which said preformed strip is fed
the ?anges thereof overlying the surface of said
with the ?anges thereof overlying the surface of
mandrel, means for guiding said strip helically
said mandrel, means for guiding said strip heli
around said mandrel with the strip crest portion
cally around said mandrel with the strip crest
radially outermost therefrom and with a ?ange of
a convolution of the strip overlapping a ?ange of
an adjacent convolution of the strip for part of
the extent of the width of the overlapping ?anges
lapping ?anges and with the inner of said flanges 15 and with the inner of said ?anges being through
out the width thereof in contact with said man
being throughout the width thereof in contact
drel, said guide means including a disc-like roller
with said mandrel, said guide means including
having
a peripheral portion with side walls of
a disc-like roller having a peripheral portion
electrically insulating material for contacting the
with side walls for contacting the opposing side
Walls of the adjacent convolutions of the strip 20 opposing side walls of the adjacent convolutions
of the strip to maintain said convolutions in given
to maintain said convolutions in given spaced
spaced relation and said overlapping ?anges in
relation and said overlapping ?anges in given
given overlapped relation and also having av
overlapped relation and also having a peripheral
peripheral edge portion for pressing against the
edge portion for pressing against the outer of
outer of said overlapping ?anges to maintain
said overlapping ?anges to maintain them in
them in close contact and with the inner ?ange in
close contact and with the inner ?ange in close
close contact with the surface of said mandrel,
contact with the surface of said mandrel, said
said roller at its peripheral edge portion having
roller at its peripheral edge portion having an
an electrode for passing of an electric current
electrode for passing of an clectrio current
through said ?anges to said mandrel to effect a 30 through said ?anges to said mandrel to effect a
resistance weld of the ?anges.
resistance weld of the ?anges.
12. In a machine for forming a ?exible tube
10. In a machine for forming a ?exible tube
from a preformed bendable weldable strip of hel
from a preformed bendable weldable strip of
ical form and having an undulated transverse
helical form and having an undulated transverse
section to include a crest and opposed wall por
section to include a crest and opposed wall por
portion radially outermost therefrom and with a
?ange of a convolution of the strip overlapping
a ?ange of an adjacent convolution of the strip
for part of the extent of the width of the over
tions and also including ?anges projecting later
ally outwardly respectively from the unclosed
ally outwardly respectively from the unclosed
edges of said wall portions; a cylindrical mandrel
edges of said wall portions; a cylindrical mandrel
about which said preformed strip is fed with the
about which said preformed strip is fed with the
?anges
thereof overlying the surface of said man
?anges thereof overlying the surface of said man 40
drel, means for guiding said strip helically
drel, means for guiding said strip helically around
around said mandrel with the strip crest portion
said mandrel with the strip crest portion radially
radially
outermost therefrom and with a ?ange
outermost therefrom and with a flange of a con
of a convolution of the strip overlapping a ?ange
volution of the strip overlapping a ?ange of an
adjacent convolution of the strip for part of the 45 of an adjacent convolution of the strip for part
of the extent of the width of the overlapping
extent of the width of the overlapping ?anges and
?anges and with the inner of said ?anges being
with the inner of said ?anges being throughout
throughout the width thereof in contact with said
the width thereof in contact with said mandrel,
tions and also including ?anges projecting later
said guide means including a disc-like roller hav
ing a peripheral portion with side walls of elec
trically insulating material for contacting the op
50
mandrel, said guide means including a disc-like
roller having a peripheral portion with side walls
of electrically insulating material for contacting
the opposing side walls of the adjacent convolu
posing side walls of the adjacent convolutions of
tions of the strip to maintain said convolutions in
the strip to maintain said convolutions in given
given spaced relation and said overlapping
spaced relation and said overlapping ?anges in
given overlapped relation and also having a 55 ?anges in given overlapped relation and of a
width substantially equal to the width of the
peripheral edge portion of electrically conducting
overlapping portions of said ?anges for pressing
material for pressing against the outer of said
against the outer of said overlapping ?anges to
overlapping ?anges to maintain them in close
maintain them in close contact and with the in
contact and with the inner ?ange in close contact
with the surface of said mandrel, said conducting 60 ner ?ange in close contact with the surface of
said mandrel, said conducting material being for
material being for the passing of electric cur
the passing of electric current through said
rent through said ?anges to said mandrel to effect
?anges to said mandrel to effect a resistance weld
a resistance weld of the ?anges.
of the ?anges.
,
'
11. In a machine for forming a ?exible tube
KARL
H.
EVERT.
from a preformed bendable weldable strip of hel 65
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