Improvements in Apparatus for Moulding India Rubber and like Materials.
Year: 1894

page_text: Date of Application, 26th Sept., 1894
005
Date of Application, 26th Sept., 1894
Complete Specification Leff, 20th June, 1895-Accepted, 21st Sept., 1895
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Moulding India Rubber and like
Materials.
HENRY BLECKLY BOURNE of 41 Priory Road Bedford Park Chiswick in
the County of Middlesex Electrical Engineer and WALTER FOX BOURNE of
41 Priory Road Bedford Park Chiswick in the County of Middlesex Engineer do
hereby declare the nature of this invention to be as follows:-
Our invention relates to machinery or apparatus for making tubes or rods of
circular or other section (which may have a core of wire or other material) of india
rubber gutta percha or substitutes therefor or of a compound of any or all of these
substances with other materials or of any substance having the required plasticity
and tenacity, by forcing the said materials through dies.
The method of operation of a machine constructed according to our invention
will be understood by reference to the accompanying diagram. We provide a disc
or drum marked A which we mount on a shaft passing through its axis and resting
in bearings and we provide any suitable or convenient gearing for rotating the said
shaft and disc upon their axis by means of steam or other motive power. This
dise A is partially surrounded by a casing B which casing consists of a block in
which a cavity has been made of a shape more or less corresponding with that of
the disc A and of such a size that a clearance or space is left between either the
ends or flat faces of the disc and the flat faces of the casing or between the curved
surfaces of the disc and easing or between both the curved and flat faces of the
disc and casing. The casing inay conveniently be shaped like an approximately
rectangular block which covers about one half of the disc A as shewn in the
diagram but the casing may be made to cover more or less than one half of the
disc. At one part this casing B may be opened out so that the clearance between
it and the disc A is made larger and tapering making a hopper as shewn at C
as this facilitates the introduction of the india rubber or other material as above-
mentioned into the cavity between the disc and its casing. When some of the said
material is thus introduced into the cavity between the disc and its casing and when
the disc is caused to rotate in the proper direction which in a machine constructed
as shewn in the diagram is in the direction indicated by the arrow drawn upon the
said diagram such material will tend to be dragged round by the disc and the
material will thus be caused to move along the cavity between the disc and its
casing in the same direction as the surface of the disc is moving and if allowed to
do so would be finally expelled from this cavity. In order that this expulsion may
take place at a convenient point we provide a scraper E in the form of a strip or
strips fixed to the casing and in contact with the sides and edge of the disc A as
shewn in the diagram. This scraper blocks up the cavity between the disc and its
casing and thus prevents to a greater or less extent according to the accuracy with
which the parts are fitted the plastic material from being dragged past such scraper
by the rotation of the disc. We further make a hole D in the casing near where
the scraper is fixed from which the material is expelled and this hole terminates at
that end which is further from the disc A in a suitable die for giving to the material
as it is forced out the required form. Such dies together with the cores and other
devices for making tubes rods threads or covering wire &c. and the method of fixing
the same to the machine are well known to persons in the india rubber trade and
others using machines for making such articles of the materials abovementioned

page_text: and do not form part of our invention which only relates to devices for forcing the
said material into any suitable receptacle provided with dies or equivalent arrange-
ments of any form required.
We have described the revolving part A as being a disc or drum but other shapes
may be given to it without departing from the principle of our invention. If it is
cylindrical in form its length may be either greater or less than its diameter or it may
have the form of two cones united at their bases and the bases of such cones may or
may not be joined by a cylindrical portion or the revolving part may be spherical or
its form may he that of an ellipsoid of revolution or any figure of revolution to the
surface of which the scraper or scrapers shewn at E may be adapted. In one
method of carrying out our invention we make the revolving part A cylindrical and
make it fit the hollow in the casing so that there is only sufficient clearance to admit
of its turning and we then make a groove or grooves of any convenient shape and
size in the revolving part and provide a scraper filling the groove or grooves and
we provide in the casing a hole through which the plastic material may be forced.
The plastic material is in this case carried round in the groove or grooves in the
revolving part in the manner described with reference to the machine shewn in the
diagram. Or we may make the machine as shewn in the diagram and further
make one or more grooves in the disc A. In the diagram we have shewn the
plastic material entering into and being expelled from the cavity between the
rotating part and its casing in a direction at right angles to the axis of the rotating
part but we may make such entrance and expulsion either or both of them take
place in a line parallel to or at any angle with the axis of the rotating part. We
may also provide additional scrapers to prevent the expulsion of the material at
any part where the said expulsion would be undesirable or may adopt other
measures for effecting this end which will be obvious to persons acquainted with
such machinery.
Some plastic materials require to be warmed before they can be manipulated in
such machines as those herein described as is well known and for this reason we
may make portions of the rotating part and its casing or of either or both of them
hollow and provide means for admitting steam to such cavities or we may adopt
any other means for raising the machine or any part of it to any required
temperature.
Dated this Twenty-fifth day of September 1894.
COMPLETE
SPECIFICATION.
Improvements in Apparatus for Moulding India Rubber and like
Materials.
We, HENRY BLECKLY BOURNE and WALTER Fox BOURNE, both of
41 Priory Road, Bedford Park, London do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
Our invention relates to machinery and appliances for making tubes, coverings
or rods of circular or other section, of india-rubber, gutta-percha, or substitutes
therefor, or of any compound having the required plasticity and tenacity, by
forcing the selected material through dies or formers having the desired sectional
configuration of the tube or rod which is to be produced.
We sometimes form our rods or tubes with a core of wire or other material, such
core being allowed to remain and to be insulated or covered by the sheathing or
it may be ultimately withdrawn.

page_text: In the two accompanying sheets of explanatory drawings,
Figure 1 is a plan of one form of our machine, and Figure 2 is a sectional
elevation of the same.
Figure 3 is a detail elevation of our die plate or holder employed in the machine
shown in Figure 2.
Figure 4 is a plan, and Figure 5 is a sectional elevation of another form of our
machine, which we employ when making large tubes or rods.
In carrying our invention into effect when constructing our machine as shown in
Figures 1, 2, and 3, we arrange a disc roller or drum A upon a central shaft M
carried in suitable bearings upon the casing B, or the framework of the machine,
and we provide any well known form of gearing L L' driven from a pulley K or
from other ordinary motive power driving mechanism for giving motion to the
shaft M. We place the disc A within the casing B so that it may be partially
surrounded by it, and have its lower portion running freely within the bed or
hollow C of the chamber; this cavity or bed C we form with a suitable clearance
or space between the circumference and side faces of the disc A and the bottom
and sides of the hollow of the bed.
One part of the bed C we shape so that it leads to an outlet trough or die
chamber D. while the upper part of the chamber communicates with the hopper or
receiving trough F into which the plastic material is introduced. We shape the
hopper F with its delivery mouth leading to the edge of the drum A. so that when
the drum is revolved in the direction of the arrow the plastic material is drawn
inwards from the hopper F and is forced out through the delivery opening into the
die chamber or guide D.
To prevent the material upon the drum A from being carried round and out of
the cavity or bed C, we arrange scrapers or check plates E round the rim edges
and side faces of the drum, the scrapers being formed of a shape to suit the shape
of the drum surface employed.
Upon the outer surface of the chamber D or upon the outer end of the delivery
passage of the cavity or bed C we arrange a die plate H' either in segments or in
one piece, of the configuration of the tube, rod or covering which is to be produced
upon our machine. When employing a guide trough or branch D we find it
convenient to carry it upon and within a hollow sleeve bracket G, and when making
a tube we support the bar or stem m which forms the bore of the tube by means of
a plate M as shown in detail at Figure 3.
We vary the method of supporting the stem and the method of arranging the
die plate to suit the particular requirements connected with the form of the tube
or covering we desire to produce upon our machine. Similarly when covering
wires we employ any well known method of holding wires, and give the desired
movement to the wires through the machine by any ordinary mechanism at present
employed for similar purposes.
When making a machine as shown in Figures 4 and 5 we employ the central disc
or drum A with its bed B, and we may arrange scrapers either rectangularly upon
the bed or inclined as shown at E in Figure 5. The outlet branch we vary to suit
any desired type of machine which is to be constructed, sometimes placing it as
shown at H G in an inclined and side outlet position, which facilitates the
introduction of a core.
When working the plastic materials which require to be kept hot or to be
warmed while under operation, we provide openings by within the casing and
chambers or drum of our machine for the introduction of steam, or we may adopt
other ordinary means of raising the temperature of any required portion of the
machine.
We sometimes vary the shape and configuration of our revolving drum roller or
disc A and the method of arranging our scrapers to work in connection therewith,
employing the same essential icatures of a revolving feeder or member which
revolves in contact with the plastic material and having scrapers or check plates to

page_text: prevent the material passing out except through the tubes or rod forming die as
hereinbefore described.
We do not limit the application of our invention to any particular form of bed
or framework for carrying our revolving drum or disc and for supporting our
scrapers, but we modify the essential features bereinbefore described for drawing
and forcing through the plastic material, to suit any particular requirement, and
we sometimes arrange a number of drums and cavities in our frame or machine.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is;-
1. The improvements in the construction and arrangement of machines for
forming india-rubber or other like material tubes or rods, or for covering cores of
wire, substantially as bereinbefore described and as illustrated in the accompanying
drawings.
2. In a machine or apparatus for producing india-rubber or other material rods
or tubes, or for covering cores of wire or other material, the arrangement of a
revolving disc roller or drum which is employed for drawing in or carrying through
the plastic material at one part of the machine or apparatus and which expels it at
another part, substantially as hereinbefore described, and as illustrated in the
accompanying drawings.
3. The combination of a revolving drum roller or disc with a bed plate or frame,
baving a cavity or cavities within it shaped to suit the disc, and having a scraper
or scrapers for preventing the plastic material from being carried out of the bed
by the continued revolution of the disc, substantially as and for the purposes
herein before described, and as illustrated in the accompanying drawings.
Dated this 26th day of June 1905
MARKS & CLERK,
18 Southampton Buildings, London, W.C., and
13 Temple Street, Birmingham, Agents for the Applicants.