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Патент USA US2406943

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Sept. 3, 1946.-
_
5. J.’ CARTER
I
2,406,943
Q
a
Sept 3,-1946-
-
5. J; CARTER :
_ 2,406,943
MEANS FOR FORMING CORRUGATED TUBE FROM STRIPS
Filed. Aug. 18, 1945
‘
>
8 -Sheets—Sheet 2
I
TEAM
AMET
S 9 ‘EVENTOR
BY
ATTORNEY
Sept 3; 1945-
5. J. CARTER
‘
'
2,406,943
MEANS FOR FORMING CORRUGATED TUBE FROM S/TRIPS
> Filed Aug. 18, '1943
8 Sheets-Sheet-4
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Sept. 3, 1946.
2,406,943
5. J. CARTER ,
MEANS FOR FORMING CORRUGATED‘TUBE FROM STRIPS
Filed Aug. 18, 1943
8 Sheets-Sheet 5
Sept. 3, 1946.
‘
5. J. CARTER
2,495,943
MEANS FOR FORMING CORRUGATED TUBE FROM STRIPS‘
Fx‘iled Augl 18, ‘1945
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Sept. 3,1946.
s. J. CARTER
’ 2,406,943
MEANS FOR FORMING CORRUGATED TUBE FROM STRIPS
Filed Aug. 18, 1943
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Sept. 3, 1946.
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2,40%{943
MEANS FOR FORMING CORRUGATED TUBE FROM STRIPS
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Filed- Aug. 18; 1943
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ATTORNEY.
2,406,943
Patented Sept. 3, 1946
purrsp STATES Parser ' QFFlCE
MEANS FOR FORMING CORRUGATED TUBE
FROM A s'raIP
Shirley J. Carter, Hayward, Calif., assignor to
Tite?cx, Inc., a corporation of New Jersey
Application August 18, 1943, Serial No. 499,085
11 Claims. (01. 113-35)
1
,
tially forming the cross section of the strip be
fore its entry into the tube-forming mechanism;
This invention relates to corrugated tub
formed from a'strip wherein is a central longitu
dinal fold or groove and the edges of the adjacent
Fig. 5 is a cross section, broken away and to
the same scale as Fig. 4, through the second pair
convolutions are interfolded to secure them to
gether. Such a tube is shown in the United
: of strip cross section forming rollers showing a
further forming of the strip cross section;
States patent to L. H. Brinkman, No. 1,198,392,
Fig. 6 is a view similar and to the same scale as
patented September 12, 1916.
Figs. 4 and 5 showing the third pair of strip cross
section forming rollers at which the strip is given
its ?nal cross sectional shape before entering the
Tubes oi the character as described in the
Brinkman patent referred to have been formed
by apparatus involving the drawing of the cor
tube-forming apparatus;
rugations through a stationary die. This causes
Fig. '7 is a top plan view, on an enlarged scale,
considerable friction in the die which reduces
of the mechanism for helically coiling the strip
the e?iciency or’ operation and also tends to wear
and seaming it into the tube, partly broken away
the die whereby its accuracy is impaired and
to show a fragmentary section, the forming and
15
this may extend, within a comparatively short
stripping rollers being in open or inoperative
time, to the point where the die, or some part of
position to permit adjustment or inspection of the
it, cannot be used further. This wearing of the
die causes inaccuracy in the formation of the
tube which may even cause imperfections and
lack of tightness in the interfolded joint. More
strip;
over, the die is difficult and expensive to main
tain and manufacture.
It is the 1 am object of the present invention
to provide apparatus for forming a tube of the
character described which shall avoid the dis
advantages referred to, which shall be emcient.
in operation, which shall accurately and reli
ably form the tube including its interiolded joint,
which shall be of long life and shall be relatively
easy and inexpensive to manufacture and main
tain.
A further object of the invention is to provide
an improved method for forming the corrugated
tube whereby the advantages as referred to may
be realized and the disadvantages, as also referred
to, may be avoided.
Other and ancillary objects of the invention
will appear hereinafter.
‘
'Fig. 8 is a top plan view of the apparatus of ‘
20 Fig. '7 to the same scale as Fig. 7 but with the
'
In the accompanying drawings which illustrate
the invention—
Fig. 1 is a top plan View of apparatus embody
ing the invention of means and by which the
invention of method may be practiced;
Fig. 2 is a side elevation of the apparatus of
stripper and sealing rolls in closed, that is, oper
ative, position;
Fig. 9 is a section on the line 9-9 of Fig. 'I;
Fig. 10 is an enlargement of the upper end of
the sectional view of Fig. 9 and with the tube
forming strip applied thereto;
I
Fig. 11 is a section“ on the line I l—-H of Fig. '7;
Fig‘. 12 is a section on the line l2--I2 of Fig. 9;
Fig. 13 is‘a'section on the line l3-l3 of Fig. 9;
Fig. 14 is a section on the line ill-M of Fig. 11;
Fig. 15 is a section on the line 15-45 of Fig. 11;
Fig. 16 is a fragmentary section, on an enlarged
scale, on the line l6-~I 5 of Fig. 8;
Fig. 17 is a section, on an enlarged scale, and
' partly broken away. on the line l'l-l‘l of Fig. 8;
Fig. 18 is a fragmentary section on the line
Iii-43 of Fig. 17 and to the same scale as Fig. 1'7;
Fig. 19 is a section on the line Iii-49 of Fig. 18,
on an enlarged scale and partly broken away
40 showing the initial stage of the interfolding or
seaming of the edges of adjacent convolutions of l
the strip;
Fig. 20 is a section on the line 29-20 of Fig. 18
to the same scale as Fig. 19 and showing the strip
Fig. .1;
in the later and completed stages of interfolding
of the edges of adjacent convclutions of the strip,
of a fragment of the pre-pforrm‘ng means for
seaming‘ them together;
Fig. 3 is a top plan view, partly broken away,
shaping the cross section of the strip prior to
its entry into the tube-forming mechanism,
showing the manner of mounting and adjusting
two adjacent strip iorming rollers for movement
toward and away from their companion rollers
and the means for effecting such movement;
Fig. 4 is an enlarged sectional view, broken,
away, through the ?rst pair‘ of rollers for ini
Fig. 21 is a fragmentary side elevation, partly
in section and partly broken away, indicating
the relations of the sealing and stripper rolls to
each other‘ and to the tube and adjacent parts;
Fig. 22 is a fragmentary view showing in sec—
tion, on an enlarged scale, a portion of the tube
as produced‘ by the apparatus referred to; and
Figs. 23 to 25 are ‘views indicating diagram
3
2,406,943
matically the manner of interfolding the strip
edges to seam them together.
Referring to the drawings, the apparatus com
prises a strip forming device whereby the ?at
strip or ribbon of metal from which the tube is
to be formed, is made of the requisite cross sev
4
toward its companion roller so that the proper
pressure upon the strip between the rollers will
be maintained at all times, the spring insuring
such pressure even though the parts may be
come worn or mal-adjusted to some extent.
It having been observed that the line of pres
sure 01" the plunger upon the block E2 to force its
carried roller toward its companion roller, is to
convolutions are interfolded to form the tube.
the right (Fig. 3) of the block pivot iii, if now
The flat metal strip i (see Figs. 1 to 6) drawn 10 it be desired to move the roller carried by the
from a reel or other suitable source of supply,»
block !2 away from its companion roller, the
passes about a pulley 2 rotatably mounted in the
handle !9 is thrown to the right of its position
stationary support ‘3, whence the strip passes‘
in Fig. 3 until the line of action oi‘ the plunger
about a pulley 4, also rotatably mounted on the
i'E’upon the block i2 is to the left of the pivot
stationary support 3, but having its axis at sub 15' [31 F The block then will be turned quickly by the
stantially right angles to that of the pulley 2.
pressure of the spring ii! to remove its carried
The ?at strip thence passes about the: strip
roller outwardly away from cooperation with its
forming roller 5 and between the roller 5 and its
companion roller and the rollers will be separated
cooperating roller 5. Both of the rollers 5 and 6
for inserting, inspecting or adjusting the strip
are rotatably mounted and when in forming po 20 as before referred to.
sition have the cooperating faces and form the
It will further be observed that the block if!
?at strip into a cross section as shown in Fig. 4.
and. the plunger i5, in conjunction with the pivot
The strip with cross section as shown in Fig. 4,
I3, provide a toggle for operating the roller car
then passes between the rotatably mounted form
ried by the block, such roller being quickly
ing rollers 1 and 8 which, when in forming re 25'. snapped into inoperative or open position as the
lationship, have the cooperating faces and form
roller it‘ passes to the left of the pivot i3, and
a cross section of. strip as shown in Fig. 5. The
is positively held in that position, while the roller
strip with cross section as shown in Fig; 5 then
is snapped into and positively held in its operative
passes on between the rotatable forming rollers
or closed relation to. its companion roller, when
l9 and 16 which, when in forming position, have 30 the roller is passes to the right of the pivot l3.
cooperating forming faces and shape the strip
It will now appear that the rollers 65, 9, and
into a cross section as shown in Fig. 6.
it], are opened up or removed from operative,
The cross section of the strip, as it leaves the
that is strip forming, relation with their com
rollers ‘8 and I0, is suitable for forming into the
panion rollers 5, ‘I, and 9 by throwing their respec-~
tube, and the strip passes from the‘ rollers‘ 9 and
tive handles I l to the left (see Figs. 1 and 3). The
i ll into the tube forming machine as will be here
strip having been placed in position, the handles
inafter referred to.
51 are'thrown to the right (Figs. 1 and 3) when
The rollers 5. 1, and ‘9 are rotatably mounted‘
the rollers 6, 8, and IE! are thrown into coopera
tion for entry into the machine whereby the strip
is helically coiled and the edges of the adjacent
in the stationary support 3. The rollers 6, 8,-and
tive relationship with the rollers 5, 1, and 9 (see
l0, however, are so mounted as to be capable 40 Figs. 4, 5, and 6) to form. the desired cross sec
of movement away from the rollers 5, 7, and 9
tion of the strip. The strip is drawn through
respectively to permit placing of the strip in po
sition, to adjust or inspect the strip, or for other
reasons, and of being moved into forming rela
tionship with the rollers 5, ‘l, and 9 respectively
to form the proper cross section of strip.‘ Thus
(see- Fig. 3) each of the rollers 6, 8, and i0 is
similarly mounted so that a description of" the
mounting of one will apply to each; thus' the
roller 6 is rotatably mounted on a pin II ?xed in
a block [2 rocking about a pivot l3 in a recess
of the support 3. In the block I2 is a recess l4
into which extends a reciprocating plunger-:15
having an anti-friction roll it at its end. .The
plunger 55 reciproeates in a cylindrical handle
I‘! and has a shoulder it between which ‘and
the end of the cylindrical handle is interposed
the apparatus just described, by the pull upon
it of the tube forming mechanism which is power
driven as will hereinafter appear.
metal
45 strip delivered from the rollers
and ii} (see
Fig. 6) then passes to the tube forming machine
which will now be described. It will be observed
that the strip as it leaves the rollers 9 and 5G.
has. thelongitudinal, central fold or groove 2%’,
50 the sides of which form the corrugation sides,
and the marginal portion of the strip on one side
of the groove has the transverse, right angled
bend lei’; while the. marginal portion on the
other side of the groove is transversely bent to
55 form the curled over portion comprising the in
clined part I62 having the hook I83 at its outer
extremity. As will hereinafter appear, the strip
a spring i9 tending to force the plunger out
is, in the machine through which it subsequently
wardly. The cylindrical handle I‘! is pivoted to
passes, helically coiled, the curled over edge at
the frame 3 at 7.0 and the plunger is maintained 60 one side of one convolution embraces the outer
in proper angular position about its axis by a
radial portion of the right angled edge l?l’ of
pin 2! secured to the plunger and sliding in a
the adjacent convolution and the engaged edges
slot 22 in the end of the handle IT. The handle
are folded inwardly to seam the adjacent con
i1 having been turned about its pivot 20 into
volutions together.
the position as shown, the line of action of the 65
The tube forming machine comprises a head
plunger on the block will be to the right of the
including the end pieces 26 and 2! encircled and
pivot I3 and the end of the block carrying the
spaced apart, so as to form a space 22 between
roller will tend to be forced by the spring [9 to
them, by a cylinder 23, the whole being clamped
turn about its pivot l3 in a clockwise direction.
together by means of screws 24. Also a cover
In this position of the block the roller will’ be‘
plate 25‘ is secured to the end piece 26 by means
pressed toward its companion roller by the pres
of screws 25. The space‘ 22 may be ?lled with oil
sure of the spring l-9 so that the strip will'be
whence it will lubricate the parts contained there
formed of the desired cross section forthat
in and proceed to the various bearings connected
stage. It will be observed that in this position‘
therewith.
the roller carried by the block I2 is spring-‘pressed
The central shaft 27 driven by any suitable
2,406,943
5
6
particularly Figs. 17 and 18) , eccentric with rela
tion to the shaft 34 and the raised portion 45 so
that the ridges of the reaction roller extend out
source of power, as for instance an electric motor,
is rotatably mounted in the end piece 2| and has
?xed. to it a central coupling member 28 having
projecting from it the ?ngers or studs 29 which
enter loosely between the projecting ?ngers 36
on the coupling member 3| whereby a universal
side the circumference of the part 45 so as to co
operate with the sealing roller 41 to perform the
interfolding or seaming together of the edges of
adjacent convolutions as will be hereinafter re
ferred to.
To drive the reaction roller the gear 39 meshes
coupling of well known construction is provided.
The coupling member 32 is rotatably mounted in
the end piece 20 by means of the ball bearing 33.
with a gear 40 ?xed upon a shaft 4| rotatably
Coaxial with the shaft 21 and ?xed to the mem 10
mounted in the end piece 26 and having ?xed
ber 32 is a shaft 34 journaled in. the member 35
upon it the gear 42 which meshes with the gear
mounted and ?xed in the end piece 20. The shaft
43 ?xed upon the member 32 so that the reaction
34 is ?xed to the member 32 by a ?at plate 32'
roller is driven from the power shaft 21. It will
clamped against a ?attened side of ‘ the‘ shaft 24
be
observed that the shaft 4| is inclined to the
15
and a flattened side of the member 32 by screws
axis of the mandrel and is substantially parallel
33 passing through the plate and screwed into
to the axis of the reaction roller. This arrange
the member 32. At its upper end the shaft 34 has
ment
of gearing and shafts enables the reaction
?xed upon it the mandrel 36 upon which the
roller to be driven on its axis at an angle to the
formed tube is delivered by the stripping rolls
after the edges of the adjacent convolutions of 20 mandrel axis, from the power shaft 21 which is
coaxial with the mandrel. .
the helically disposed strip have been interfolded
together by the sealing roll and its cooperating
reaction roll upon the interior of the tube as
will be hereinafter referred to.
Rotatably mounted on the member 35 is the
sleeve 31 to which is integrally ?xed the'reaotion
2.5
roller 38 and a gear 39. The reaction roller is
formed by forming the annular grooves 38' and
39' in the member 31 whereby the annular ridges
46’ and 4|’ and the annular shoulder 42' are
Distributed about the center of the shaft21
and approximately 120° apart are the stripper
rolls 45' and 46 and the sealing roll 41. The seal
ing roll 41 cooperates with the reaction roller 38
to interfold the adjacent edges of the incoming
strip and its preceding convolution, thereby seam
ing and sealing the edges of the incoming strip to
its preceding convolution in the tube, while the
stripper‘ rollers 45' and 46 engage the tube to
hold the parts in position and force the tube or
“strip” it out upon and along the mandrel 33
reaction roller is inclined to the axis of the
whence it issues from the machine as the com
mandrel. This gives the inclination of the reac
pleted tube. The rolls 45', 46 and 41 are inclined
tion roller necessary to conform to the pitch of
the strip as helically disposed to form the tube. 35 to the axis of the mandrel and of the tube being
formed. It will be observed that the axis of the
Surrounding the member 31 and clamped in
place against the interior of the end piece 20 by
the cover plate 25, is a housing 44 for the reac
formed, the shafts carrying these rollers being
mounted upon shafts inclined to the mandrel ‘and '
tube axis so that the rolls may properly conform
‘to the helical contour of the strip forming tube.
tion roller and its driving gear 39, this housing
being split on the diameter 43’ to permit assem ~10 Also the rolls 45', 46 and 41 are mounted so as
to be movable toward and away from the man
bly of the parts within it. The housing has a
drel axis so as to be movable into position to
central, annular, raised portion 45 about the cen
operate upon the strip and tube or into inopera
tral hole, such raised portion having on its out
tive position where the strip and tube under the
side the helical surfaces 1| and 12 corresponding
to the pitch of the strip as helically disposed in 45 rollers may be inspected or adjusted. The
mountings for the rollers 45'," 46 and>41 are simi
the tube, for supporting and guiding the lower
lar and consequently a description of the mount
right-angle shaped edge of a the strip ?rmly and
ing for one of such rollers will apply to each and
surely into proper position to be embraced by
the mounting of the stripper roll 46 has been
the curled over edge of the incoming strip. Upon
chosen for the purpose of illustrating this mount
50
its inner side the member 44 has an inwardly
ing (see Fig. 11).
'
extending'annular projection 13 and also an arc
The stripper roll 46 is fixed upon a shaft 48
shaped, inwardly extending projection 14, the
rotatably mounted in the sleeve 49 ?xed to an
projection 14 ?tting within the groove 39' and the
arm -or block 50 rotatably mounted upon a shaft
annular projection 13 ?tting into the groove 38',
5| which is mounted in the end piece 20. Rotat
the fit being a close running ?t so that the annu 55
ing upon the shaft 5| is a gear 52 meshing with
lar ridges 4'0’ and 4|’ and the whole reaction
the gear 53 ?xed upon the shaft 48. The roller
roller are ?rmly held in position.
46 may be moved into and out of operative posi
The annular, raised part 45 is coaxial with the
tion (toward and away from .the mandrel axis)
mandrel 36 and the shaft 34, and the diameter
rocking the sleeve 49 about the center of the
of the upper part of the portion 45 is substantially 60 by
shaft 5|, the end piece 20 having a recess 54 to
the same as the diameter of the innermost part
accommodate the sleeve 49 and the support 50
of the formedcorrugated tube 15, so that the tube
and permit the rocking movement thereof as‘re~
slips readily from the portion 45 to the adjacent
ferred to. It will be seen that the rocking move
portion of the mandrel '36, which mandrel por
ment of the sleeve 49 about the shaft 5| will also
tion is of substantially the same diameter. The 65 be-about the axis of the gear52, so that the gears
portion of the mandrel which is adjacent 'to the
53 and 52 will stay in mesh regardless of the
portion 45 therefore holds the formed tube in line
swinging or rocking motion of the sleeve 49, the
adjacent to the region of the formation of the
shafts 5| and 48 being parallel.
tube so that the parts are held in place, but there
‘ The gear 52 is a part‘of the sleeve 55 rotatably
'after the mandrel beyond the shoulder 16 may 70 mounted upon the shaft 5| ‘and comprising the
be of smaller diameter, its one function being to
prevent the formed tube from falling too far out
of line, and ‘the friction between the tube and the
mandrel is decreased.
The reaction roller is, it will be observed, (see
integrally formed universal coupling ‘member 56
having a series of projections 51 entering loosely
in between the projections 58 of another coupling
member. This form of universal coupling is. well
57
2,406,943
knownx-andrrequiresno‘ further description. 1;’I'he
coupling :member 1'58 :is .rotatably; mounted ‘upon a
stud. 59 ?xedintthe piece 2I._and;h'as' ?xed .to it
the gear :50. ' This gear-being.driventhrough-the
:train .Qf ’ gearing comprising. ."the :gear 6 In: ?xed
upon’ the centralmdrive shaft: 21 which :meshes
"With‘ thetgeari 62=?xed to the gear 63; the gears
62 and 63 being rotatably mounted UPOnfthB'Stlld
‘64 ?xed in the end headiZ I. . The gear: 63.meshes
terior and: prevents .the' passage-in either. direc
tion of oil,~-water or dustnandat the same time
permits the handle. 95 to be melted, in either
direction about its pivot 91 to swing the shaft BI
about the shaft 89 as before referred to. It will
be seen that a similar mechanismis provided for
swinging the shaft 83 about the shaft 88.
‘ The sealing roller 41 has the annular corru
gations‘ or ridges‘ I65 and IE6 between which is
withthe gear 65 rotatablymounted upon theJstud
an annular groove into which the ridge 4|’ of
??'rfor the sealing. roller 41,. the stud 66 corre
the
reaction roller extends, the ridges I05 and IE6
sponding-to the stud 59 for the stripper roll 46.
respectively. extending into the grooves 39' and
‘The gear 65:meshes_with'the idler: gear 67 rotat
38'. ‘The ridges I05 and I06 extend into the
ably mountedonttheend head 2I, the gear 51 in
central longitudinal groove, in the incoming strip
turn‘ meshing. with the gear/B8 rotatably mounted 515 and in the' preceding adjacent convolution. As
‘upon. the stud 69' for..-th'e stripper roll 45; such
the strip-is drawn into the apparatus, the curled
studcorresponding to .the‘stud .53;for the roll 46.
edge of the incoming strip. embraces the radial
The gear 568 meshes with the idler gear. 10 rotat
edge of the last preceding convolution shortly
ablymountedzin the .end head'2I; the'gear'JIl
before the strip edges pass between the sealing
meshing with the gear GBsecured .to the universal :
and reaction rollers. The two edges as so en
coupling member 58 drivingithe 'shaftI48.-for the
gaged are drawn into the groove in the sealing
‘stripper roll 46.
rollenbetween the ridge M’ of the reaction roll
ZTheI‘shafts' 80 and'8l upon'wh'ich-‘the ‘stripper
er and the bottom of the groove, radial pressure
r0111 45’: and the'sealing' roll 41' are-respectively
being gradually applied to them whereby they
?xed; respectively correspond with the shaft 48 .25 are pressed together and interfolded until at the
of ‘the: stripper .roll 46. ‘Upon these shafts 80 and
point of nearest approach of the rollers the edges
-SI are-respectively: ?xed the-gears 82 and’ 83
will be tightly interfolded and pressed together.
which-respectively: mesh‘ with the gears 84 and 85
Thisis especially shown in Figs. 18, 19, and 20.
upon the sleeveszilli and 8?: corresponding-respec
The curled over edge, comprising the parts ‘I02
tively: with the ‘sleeve 55 inrelation to ‘the strip 30 and'lll3, of the incoming strip'embraces the
per roll: .45, ;th‘e:lsleeves' 86 andf87: being respec
radial edge IIOI' of the last convolution seamed
tivelyyrotatably mounted onshafts'BS and-~89
into the tube, just before the rollers are reached.
corresponding respectively to the-shaft 5|‘ of_- roll
As the rollers are more closely approached, the
'46 ..and.;driven through universal coupling by
1means'of: gears.v 68*‘ and‘ 65 inaa, 'manner as set
forth in connection with stripper roll 45.
.; The arm or. block .EB-pivotedon the shaft 5| ‘is
acted upon'by a spring-pressed plunger 90 hav
ingan anti-friction roller at its end and extend
ingrinto the recess; 9| in' :the' block 5B. The
plunger. 90 :reciprocates endwise in a cylinder 92
pivoted in the end head .20 and pressed outwardly
of the cylinder towards the block-bymeans of a
spring. .This construction is similar to theblock
vinterengaging edges occupy- a position as shown
in‘ Fig. 19 and then, as ‘they: are drawn further
in between the rollers, they are further folded
over into the-position as shown in section in- Fig.
20, and on being drawn between the rollers to the
point of their closest'approach' th'e interengag
.ing-stripedges vwill be: pressed into their ?nal,
compact interfolded position as shown in ID‘! (Fig.
20) and as in the completed tube see I 08 (Fig. 22).
-The operation 'of interfolding the strip edges
may be further explained with reference to Figs.
and operating means of the rollers" 5,‘ ‘I, and 9 l' '
23 to 25. Referring to Fig. 23, the dotted line I III '
(see: Fig.3). In the case of the ‘shaft 48,'this,
represents a transverse section of the radial edge
with itsistripping roller. is moved outwardlyor is
of l a strip convolution already seamed into the
pressedn‘nwardly. according to Which side of the
tube at its other edge, while the dotted line com
.center- of theishaft 5|‘ the line of pressure of the
prising the parts I03, I02 and‘ I00’ represents‘ a
plunger 99 is on. An adjustable stop screw 93 in V50 transverse section of the incoming strip. wIt will
the block 53 comes against the .head12Il to‘limit
have been observed that the incoming strip is in a
‘the. inward movement of the roll on'th‘e shaft 48.
line substantially tangential to the reaction and
‘It will be seen (Fig.'14) that‘ thersame con
sealing rollers while the radial edge IOI’ of the
struction of means is employed for swinging the
convolution
already seamed to the tube at its
shaft 8 I of the re-action roller 41 about the'shaft :
other edge, moves in a circle about the mandrel
89 and the shaft 88 of the stripperroller '45 about
axis and that. as the said edge IIJI’ rotates and
theshaft" 88. Details of the operating means for
the
incoming strip is drawn in between the reac
thus swinging the shafts ‘of therollers respec
tion and sealing‘ rollers 38 and 47, the said edge
tivelyare shown forexample in connection with
theshaft 8| of the'sealing' roll 41, the spring
pressedtoggle: block 83' being shifted by the
IIII’ and the curled edge‘of the incoming strip
60 will converge, ‘the edge MI"
passing‘ gradually
within the ‘embrace of the curled over edge of the
“plunger ‘94 sliding in the cylinder 95 and pressed
incoming strip. and the two edges being gradually
outwardly by a spring‘ 95 interposed between a
bent over together ‘by the application of radial
shoulder on the plunger and the end of the cyl
pressure
until in the position of nearest approach
inder (seeFig; '7) and the cylinder 95 being piv 65
of the rollers the edges are'interfolded into the
oted to the end piece‘20; at 97. ‘To hold the
completed seam.
'
plunger in proper angular position a pin 93 ex
.tendingthrou'gh' the plunger’ sides‘ in a slot 99
in the end of the plunger. In order to close the
recess in which‘ the block 93 is located, a circu
lar wall I00 is tightly secured to the block 20 and
a" ?exible diaphragm 'IDI, such as leather or rub
~ber,:;is secured in a fluid-tight manner to the
:rim tofu-the. wall‘ I80 and also, to the p1unger'95.
.‘I’hisxeffectuallyicloses off the recess from. the-.ex- .
In Fig. 23 the marginal portions of the strip
sections represented by the dotted lines are those
which will be interfolded together, occupying the
same‘ position longitudinally of the completed
seam. In the position shown in‘ Fig. 23, these sec
tions of the strip edges have not progressed ‘far
enough toward the rollers to have the radial edge
IIJI ' enter within the curled edge of the incoming
strip although'it is about toldoso. "As these strip
2,406,943
sections approach the complete interfolded posi
10
of the driven stripper rollers and also the grip
tion between the rollers as referred to, they will
of the driven reaction and sealing rollers on the
reach a position as indicated in Fig. 24 where
the edge I0l' has entered Within the curled over
which it is interfolded.
edge of the incoming strip and both havebeen
bent laterally of the scam, the portion IOI’ hav
ing its edge cammed outwardly by and sliding
along the inclined part I02 toward the hook I03.
incoming strip and the tube convolution with
,
The incoming strip proceeds from the rolls so
that its right angled edge rests upon the helical
supporting surfaces ‘II and 12, the plane of the
strip preforming rolls being preferably inclined
(see Fig. 2) to correspond to the helical pitch of
As these sections move further. toward the full
interfolded position the edge of the portion IOI' 10 the surfaces ‘H and 12. The incoming strip is
‘ thus positioned with relation to the convolution
will move, into the hook I03 and the parts ‘will
to which it is to be seamed, so that the curled
?nallybe bent into the full interfolded position as
over edge of the strip embraces or, hooks over
shown in Fig. 25 at the point of nearest approach
the radial edge of the convolution. The two edges
of the rollers. Succeeding sections will be acted
thus interengaged, then are drawn in between the
upon in a similar manner and thus the seaming
reaction and sealing rollers whereby they are
of the incoming strip to the edge of the last pre
gradually bent over into ?nal interfolded condi
ceding convolution secured at its other edge into
tion by the radial pressure of the sealing roller
the tube, will be carried on continuously for as
long a period as is desired. It will be observed
thereon._ The interfolded or seamed edges then
.that this interiolding is accomplished by radial 20 pass on through the helically arranged stripper
rollers by which the tube is moved longitudinally
pressure upon the interengaging strip edges, such
pressure being exerted on the peak I09 of the
onto the mandrel as before described.
_
It will be seen that the incoming strip is con
curled over portion of the incoming strip thereby
tinuously seamedto the next preceding convolu
bending the inclined portion I02 about its end
so long as it is desired to ‘continue the opera
I I0. vAs the part I02 is thus bent, the radial edge 2.5 tion
tion
and that such strip is bent into its helical
of the adjacent convolution will be bent with it
form by‘ being seamed to the convolution.
into the ?nal interfolded condition in the com
The drive‘shaft‘? may be‘driven by an electric
pleted seam. The inclination of the part I02 will
motor
“0 supplied with current from mains III,
facilitate and insure the proper movement of the
the operation of the motor being controlled by a
radial strip, edge which is embraced by the curled 30 main switch II2.
,
,cver portion, 50 that the two strip edges are cer
f ‘ In'the apparatus illustrated provision is made
tainly and accurately moved into the ?nal inter
for soldering the seam. This is accomplished by
folded condition as referred to. From the reac
drawing into the seam as it is formed, a thread
tionand sealing rollers theseam passes into the
I I3 of solder which may have a ?ux incorporated
35
annular groove III of the stripper roller 45’ and
with it as is well understood. Such solder thread
thence about the portion 45 to the groove H2 in
being incorporated in the seam, is drawn there
the stripper roller 46. The seam thus passes on
by from a reel‘ II4 over the idler pulleys H5 and
in the completed tube and out upon the mandrel.
I I5’. The tube, complete except for heating and
- The stripper rollers 45’ and 46 are alike, the
roller 45" being displaced from the sealing roller
by one third of the pitch of the seam in the com
pleted tube, along the tube axis, and, the roller ‘
46 being displaced from the roller 45' by one
subsequent cooling to accomplish the soldering
operation as is well understood, with the solder
thread in the seam, is as shown in‘ Fig. 22. The
tube of Fig. 22'is then heated to e?‘ect the solder
ing of the point and is then allowed to cool.
third of the seam pitch, along the tube axis
It is desirable, where soldering is wanted, that
whereby the seam in passing through the grooves 45 if ‘the solder thread should break the operation of
of the stripping rollers as referred to, conforms
the" machine should stop’ in order to avoid un
to- the helix of the corrugation in the completed
soldered portions of the seam. To this end a
tube. As shown, there are other annular grooves
switch is provided in the supply circuit of the
than those mentioned in the stripper rollers
motor having a pivoted member I I6 carrying one
50
whereby ridges on those rollers are adapted to en- .
"of the ‘switch contacts‘, biased to separate its car
gage in the ‘helical groove of the tube already
ried contact from the other switch contact and
formed thereby improving their engagement with
‘open the circuit. The pivoted member, however,
the tube. > The sealing, reaction and stripping roll
ers being driven in the directions as indicated by
carries a roller II'I over which the solder thread
II4 passes and the tension on the thread occa
the arrows in Fig. 18, the tube will be rotated in 55 sioned by the drawing‘ of the thread into the
a counterclockwise direction (Fig. 18) and, its
‘seam fromlthe reel, holds the contacts‘ together
corrugation engaging in the grooves of the sealing
and maintains the motor circuit. Should the
and ‘stripper rollers arranged axially of the tube
thread‘ break, its tension would be removed and
so as to conform to the pitch thereof, will cause
‘the arm H6 would move to separate the contacts
the tube to move outwardly upon and along the
mandrel and thence pass from the mechanism.
The mandrel is driven in the direction of rota
tion of the tube but, in order to avoid all danger
of- snubbing of the tube thereon it is driven at a
slightly slower speed than the tube.
The operation of the mechanism may be briefly
traced as follows:
thereby stopping the vmotor.
Ifit is not desired to solder the scam, the
solder thread may, be omitted from the scam,
the‘ ‘operation of forcing the tube from the strip
65 being as hereinbefore described. Also where the
solder thread is omitted the thread reel, its idler
‘guide pulleys and the solder thread controlled
_
The strip from which the tube is made is pre
formed by a series of pairs of rollers so as to be
of- the proper cross section for introduction into
'the mechanism for helically disposing it and in
--terfolding the edges 01! adjacent convolutions.
This strip ‘is drawn through the preforming rolls
and into the seaming and coiling mechanism by
the rotation of the tube already formed byreason
7.0
switch in ‘the motor circuit, should be. omitted,
‘the last mentioned switch being substituted by
.a permanent ‘circuit connection.
_' While theinvention has been illustrated in
what are ‘considered its best applications, the
invention of apparatus may be embodied in other
structures and the invention of method may be
fvariousl'y practised without departing from its
2,406,943
11
spirit. The invention of apparatus is not there
fore limited to the structures of the drawings and
the method is not limited to the precise details
recited.
12
.
ber about which the strip passes, a rotatable re
action roller embraced by said member, said
roller being eccentric with relation to said mem
ber and said member having an opening at one
side permitting cooperation of said reaction roller
1. A mechanism for forming a corrugated tube
with a sealing roller, a rotatable sealing roller,
from a strip comprising in combination a mem
said sealing ‘and reaction rollers having cooper
ber about which the strip passes, a rotatable re
ating grooves and ridges adapted to interfold
action roller embraced by said member, said roller
marginal portions of the strip and a helical sup
being eccentric with relation to said member and 10 port for the strip extending about said member.
said member having an opening at one side per
7. A mechanism for forming a corrugated tube
mitting cooperation of said reaction roller with
from a strip comprising, in combination a mem
a sealing roller, and a rotatable sealing roller,
ber about which the strip passes, a rotatable re
said sealing and reaction rollers having cooper
action roller embraced by said member, said
ating grooves and ridges adapted to interfold 15 roller being eccentric with relation to said mem
marginal portions of the strip.
ber and said member having an opening at one
2. A mechanism for forming a corrugated tube
side permitting cooperation of said reaction roller
from a strip comprising in combination a mem
with a‘ sealing roller, a rotatable sealing roller,
ber about which the strip passes, a rotatable
said sealing and reaction rollers having cooper
What I claim is:
r
reaction roller embraced by said member, said 20 ating grooves and ridges adapted to interfold
marginal portions of the strip, said sealing roller
being mounted to move toward and away from
side permitting cooperation of said reaction
said reaction roller.
roller being eccentric with relation to said mem
ber and said member having an opening at one
roller with a sealing roller, and a rotatable seal
8. A mechanism for forming a corrugated tube
mg roller, said sealing and reaction rollers hav
from a strip comprising in combination a mem
ing cooperating grooves and ridges adapted to 25 ber
about which the strip passes, a rotatable re
interi'old marginal portions of the strip and a
action roller embraced by said member, said
stripper roller engaging said strip after it has
roller being eccentric with relation to said mem
been secured to the tube, for urging the tube
ber and said member having an opening at one
longitudinally.
'
side permitting cooperation of said reaction roller
3. A mechanism for forming a corrugated tube 30
with a sealing roller, a rotatable sealing roller,
from a strip comprising in combination a mem
said
sealing and reaction rollers having cooper
ber about which the strip passes, a rotatable
ating grooves and ridges adapted to interfold
reaction roller embraced by said member, said
marginal portions of the strip, a stripper roller
roller being eccentric with relation to said mem 35
engaging
said strip after it has been secured to
ber and said member having an opening at one
the
tube,
for
urging the tube longitudinally, and
side permitting cooperation of said reaction roller
means for spring pressing said sealing and strip
with a sealing roller, and a rotatable sealing
per rollers toward the axis of said member.
cooperating grooves and ridges adapted to inter 40 9. In a mechanism for forming corrugated tub
ing from a strip which is helically disposed and
fold marginal portions of the strip and a plurality
roller, said sealing and reaction rollers having
of stripper rollers ‘engaging said strip after it
has been secured to the tube, for urging the tube
longitudinally, said sealing and stripper rollers
being symmetrically placed about said member.
4. A mechanism for forming a corrugated tube
from a strip comprising in combination a mem
ber about which the strip passes, a rotatable re
action roller embraced by said member, said roller
being eccentric with relation to said member and
said member having an opening at one side per
mitting cooperation of said reaction roller with
a sealing roller, a rotatable sealing roller, said
has edges of adjacent convolutions interfolded,
in combination, a mandrel coaxial with and inter
nal of the formed tube, a reaction roller adjacent
one end of the mandrel having annular grooves
and ridges and extending within the formed
tube, an external sealing roller having annular
grooves and ridges cooperating with the reaction
roller to interfold the edges of adjacent convo
lutions of the strip, and means to rotate the man
drel, said rotating means being situated remotely
of said mandrel and said reaction roller and in
cluding a drive shaft passing through said reac
tion roller and connected with said mandrel.
10. In a mechanism for forming corrugated
sealing and reaction rollers having cooperating
grooves and ridges adapted to interfold marginal 65
tubing from a strip which is helically disposed
portions of the strip and a rotatable mandrel
and has edges of adjacent convolutions inter
substantially coaxial with said member.
folded, in combination, a cylindrical mandrel
5. A mechanism for forming a corrugated tube
coaxial with and internal of the formed tube, said
from a strip comprising in combination a mem
ber about which the strip passes, a rotatable re 60 mandrel having an outside diameter substan
tially equal to the inside diameter of the formed
action roller embraced by said member, said
tube, a reaction roller adjacent one end of said
roller being eccentric with relation to said mem
mandrel having annular grooves and ridges and
ber and said member having an opening at one
extending
partly Within the tube formed, the out
side permitting cooperation of said reaction roller
side diameter of the portion so extending being
with a sealing roller, a rotatable sealing roller,
smaller than the outside diameter of the man
said sealing and reaction rollers having cooper
drel,
an external sealing roller having-annular
ating grooves and ridges adapted to interfold
grooves
and ridges cooperating with the reaction
marginal portions of the strip and a rotatable
roller to interfold the edges of adjacent convo
mandrel substantially coaxial with said member,
lutions of the strip, and means to rotate the
said mandrel adjacent said member being of 70 mandrel, said rotating means being situated re
substantially the same diameter as said member
motely of said mandrel and said reaction roller
and of less diameter at a distance from said
and including a drive shaft passing through said
member.
reaction
roller and connected with said mandrel.
6. A mechanism for forming a corrugated tube
11. Ina mechanism for forming corrugated
from a strip comprising in combination a mem
tubing in a strip which is helically disposed and
2,406,943
13
14
has edges of adjacent convolutions interfolded,
nular grooves and ridges cooperating with the
reaction roller to interfold the edges of adjacent
in combination, a mandrel coaxial with and in
ternal of the formed tube, areaction roller ad
jacent one end of the mandrel having annular
grooves and ridges and extending within the
formed tube, said reaction roller being arranged
for rotation about an axiswhich is angularly dis
convolutions of the strip, and means to rotate the
mandrel, said rotating means being situated re
motely of said mandrel and said reaction roller
and including a drive shaft passing through said
reaction roller and connected with said mandrel.
posed with respect to the longitudinal axis of the
mandrel, an external sealing roller having an
SHIRLEY J. CARTER.
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