close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2133137

код для вставки
Oct. 11, 1938.v
'
,
_
H. c. HACKETT
'
2,133,137
METHOD 9F MAKING TUBES
Filed Sept. 20, 1937
'
'
INVENTOR
‘ATTORNEY \'
'
_
2,133,137
Patented Oct. 11, 1938
UNITED STATES ‘PATENT OFFICE
2,133,137
Q. METHOD OF MAKING TUBES
Harry 0. Hackett, Wilmington, Del., assignor to
National Vulcanized Fibre 00., Wilmington,
Del., a corporation of'Delaware
Application September 20, 1937, Serial No. 164,800
3 Claims. (01. 154-2)
The present invention relates to the making of made by winding upon a mandrel the required
tubes and more particularly to the making of vul ‘ number of convolutions or layers of treated open
canized ?bre tubes having relatively thick walls. stock to make a tube of given thickness after
shrinkage losses are ‘allowed. Ordinarily the
In.‘ the manufacture of tubes made of vul
stock is drawn from a roll passed through‘ a 5v
5 canized ?bre and other chemically treated mate
rial in sheet form the general practice has been treating bath containing a gelatinizing agent,
to wind the material upon a mandrel until it such as a suitable acid and wound on the man
drel to‘ predetermined thickness when it is auto
has reached the required diameter, with due al
lowance for shrinkage and while this is satisfac-' .matically severed and the wound mandrel-re
10 tory for tubes having relatively thin walls it is moved. The tube is now pured, dried and rolled 10
most unsatisfactory where a thick or heavy wall - so that the result is a completely ?nished tube
tube is desired. Heretofore tubes of thick walled It with a relatively thin wall having no breaks
‘construction made by this ordinary ‘method or cracks therein. A mandrel l l is now inserted
blister and crack so that one layer of material is in the ?nished tube i0, and the latter then
15 'circumferentially out of contact at various points placed in the winding or forming machine. One 16 ‘
with the I next adjacent layer of material, or
form of such machine is indicated in Fig. 3
wherein. driven rollers l2 and I3 support the
.While there seems to be no general rule as to the tube In in surface contact therewith. The pa
number. of layers which can be successfully per stock length It is drawn from” a stock roll
there are radial cracks through several layers.
20 wound without blistering and cracking because
of the various diameters of ?nished tubes, it is
well lmown that up to a certain relatively thin
wall thickness no such defects appear. On the
other'hand as soon as wall thicknesses beyond
25 this safe maximum thickness are called for, pres
l5 passing through a treating bath l6 of the 20
character noted .to wind about the tube It and
form the encompassing tube‘ portion l1. The
desired cohesion between the surface of the tube
I 0 and the stock It, as well as the succeeding
ent day methods fail to prevent the layers of
layers of stock is brought about through pressure 25
applied through the roll l8, and the action of
material cracking during the drying and?nish
the treating acid which causes the surface of the
ing steps.
'
Some of the objects of the present invention are
30 to provide a method of tube making wherein
perfect tubes of any desired thickness can be
successfully made; to provide a method wherein
cracking, blistering and like defects in tubes of
laminated construction are eliminated; to pro
?nished tube to knit into the ?rst superposed,
layer to form a perfect union. This winding op
eration continues until the thickness of mate- 30
rial superposed about the tube ID will, after
'shrinkagagive a tube of the predetermined di- '
ameter and wall thickness. Following this wind
ing operation the tube is removed to soak in a
35 vide a method of tube making wherein thick ‘ purifying bath until all excess treating liquid is 35
walled tubes canbe made as perfectly as tubes leached out after which the tube is placed in a '
drierand thereafter submitted to a rolling under
having thin walls; and to provideother improve
ments as will hereinafter appear.
In the accompanying drawing Fig. 1 repre
40 sents a perspective of a tube as partially formed
in accordance with the present invention; Fig. 2
represents a perspective of the tube of Fig. 1
mounted upon a mandrel; Fig. 3 represents’ dia
grammatically the step following the stage rep
‘5 resented by Fig. 2; _ and Fig. 4 represents a por
. calender rolls whereby to ?nish the same at the»
?nal dimension desired. The shrinkage which
occurs during thedrying action is restricted .to 46 I
the secondary winding of material since the ?rst
winding has completed its shrinking when first
subjected to the drying operation. It has been
discovered that a.tube made in accordance with
the present method has its outer series of plies-45
tion, in perspective, of a ?nished thick walled
tightly laminated to the surface of the inner-1
tube embodying the method of the invention.
Refen'ing to the drawing-those steps believed
helpful in the understanding ‘of the present in
series of plies, the two surfaces being perfectly
cohered throughout the whole-area. Thus while
the completed tube consists of two‘ separately
formed portions l0 and I7, one encompassed by 50v
vention are illustrated and in the following de
scription the making of a vulcanized ?bre tube - the other, the joint or seam between the two sets
is taken as an example of the application of the of plies is invisible and » the effect, not only to
the eye but as a physical fact, is that of a unitary
' invention. The first stage in the'method con
tube having athick wall devoid of blisters, cracks,
sists in making’ a complete ?nished tube It hav
ll ing- a relatively'thin wall. Such a tube 10 ‘is I irregularities or other imperfections ordinarily M -
2
2,183,187
found in tubes of like thickness made by prior‘
‘methods.
'
While the foregoing describes the making of va
tube through two successive winding operations,
2. The method of making a vulcanized-?bre
tube having a relatively thick wall from strip
material which consists in ?rst forming a rela
tively thin walled tube by chemically treating the
one following a completed tube, the invention isv strip with a gelatinizing agent, winding, puring,
not limited in this respect in that a series of drying and rolling the wound strip material to
' winding can be made if found expedient. That produce a ?nished tube of a limited dimension,
is to say each series may become a ?nished tube ’ and thereafter using said tube as a mandrel and
to be used as ‘a mandrel for another series, and winding on it additional layers of similarly’treat
10 in this way a unitary wall of maximum thickness ed strip material to build up the tube to a de— 10
sired dimension, applying pressure during the
can be built up free from cracks and other de
‘winding operation, and puring, drying, and roll
fects now normally present in tubes of corre
sponding thickness made by methods heretofore ing the tube to ?nish the same at its ?nal di
mension whereby the thick walled tube formed
practised.
-
Having thus described my invention, I ‘claim:—
1. The method of making a vulcanized-?bre
tube having a relatively thick wall from strip
material which consists in ?rst forming a rela
tively thin walled tube by chemically treating
the strip with a gelatinizing agent, winding,
puring, drying and rolling the wound strip mate
rial to produce a ?nished tube of a limited di
mension, and thereafter using said tube as a
thereby will not blister or crack.
15
3. The method of making a vulcanized-?bre
tube of strip material having a relatively thick
wall free from blisters and cracks which consists
in forming a relatively thin walled ?nished tube
of vulcanized-?bre strip material of a dimension 20
where the possibility of blistering or cracking is
minimized, and thereafter using said tube as a
mandrel and winding on it additional layers of '
mandrel and winding on it additional layers of i chemically treated strip material to build up a
similarly treated strip material to build up the
tube to a desired dimension, and puring, drying,
and rolling the tube to ?nish the same at its
?nal dimension whereby the thick walled tube
formed thereby will not blister or crack.
relatively thick walled tube of the‘ desired di 25
mension, and puring, drying and rolling the tube
to ?nish the same at its ?nal dimension.
HARRY C. HACKETI‘.
Документ
Категория
Без категории
Просмотров
0
Размер файла
268 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа