Improvements in the Manufacture of Glass Tubing.
Year: 1890

page_text: Date of Application, 25th July, 1890
Complete Specification Left, 23rd Apr., 1891-Accepted, 23rd May, 1891
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Glass Tubing.
We DAN RYLANDS of Shepcote near Barnsley in the County of York Glass
Manufacturer, and ALFRED HUSSELBEE of Hunningley Lane Stairfoot, near
Barnsley aforesaid, Glass Tube Drawer do hereby declare the nature of this
invention to be as follows:-
Our present invention has for its object: first, the forming on glass tubes that
are first plain of screw threads to any required size or pitch so that any two pipes
with these threads formed on can be jointed together by a socket or coupling made
of metal, brass, or other suitable substance or substances which has a screw thread
formed in it to work in the screw thread we form on the glass tube.
The second portion of our invention relates to the manufacture of tubes having
polygonal fluted, or other ribbed sides so as to render the tubes stronger and
otherwise more adapted for hard usage than the ordinary plain glass tube.
According to the first part of our invention we take a tube which has been
drawn to any required internal diameter, and to any required thickness, and after
warming one end of this tube in the furnace or "glory-hole" we introduce the
heated end into a mould having a screw thread cut on its inside and we then blow
down this tube by either mechanical means or by the mouth so as to force the
heated glass into the screw threads in the mould and thus form a screw on the
glass. Where so preferred inclines may be made in the same manner instead of
screws; and where so preferred we can also form any suitable number of slots in
addition to the screws.
In some cases it may be preferable to work a plug from the underside of the
mould in which the screw thread is blown, and this plug will fit or nearly so into
the inside of the mould. In some cases it may be preferable to form the screw
thread by means of tools such tools carrying suitable dies for forming the outside
screw thread and a suitable plug for forming the inside of the tube. In some cases
it may be desirable to first press the screw in a suitable mould, or to partially press or
partially blow the screw in a suitable mould; and then to heat the plain glass at
the end of this screw and to heat a piece of tube the length required to correspond
to it, and then to join this pressed screw thread to the glass tube by bringing the
two ends in contact, or we pass a tube when first drawn and while it is still in a
plastic or semi-plastic condition into a mould made to open at the sides, such mould
being the size inside that the tube is required to be outside, and such mould
carrying a screw thread at one end or a screw thread at each end, and thus when
the tube is blown up the glass will be blown into the screw threads. To facilitate
this operation and to better ensure its success we make a mould of iron or metal or
any other suitable substance, and this mould carries a box at one end so as to form
a sort of "burst-off" at the end of the thread.
Where it is desired to make glass pipes with fluted, polygonal or other ribbed
sides or surfaces it is necessary not only to have the mould to open and shut and to
have it with the box attachment above described, but also to have the mould
suitably shaped so as to form the glass tube either fluted or polygonal or other
shape required.
The moulds in which these tubes are blown will be made to open at the sides,
but in some cases where only the thread is blown on the end of the tube a solid
mould may be used, and it may be screwed off the end of the tube (when such has
been blown) by means of a pipe wrench or other appliance.

page_text: COMPLETE SPECIFICATION.
Improvements in the Manufacture of Glass Tubing.
We DAN RYLANDS of Shepcote near Barnsley in the County of York Glass
Manufacturer, and ALFRED HUSSELBEE of Hunningley Lane Stairfoot near
Barnsley aforesaid, Glass Tube Drawer 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 has for its object first, the forming on glass tubes that are first
plain, of screw threads to any required size or pitch so that any two pipes with
these threads formed on can be joined together by a socket or coupling made of
metal, brass or other suitable substance or substances which has a screw thread
formed in it to work in the screw thread we form on the glass tube. The second
portion of our invention relates to the manufacture of tubes having polygonal,
fluted, or other ribbed sides, so as to render the tubes stronger and otherwise more
adapted for hard usage than the ordinary plain glass tube.
In order to illustrate clearly the nature of our invention we append hereto a sheet
of drawings in which Figs. 1, 2, 3, and 4, are elevations in section; Figs. 5 and 7 1
are elevations of ends of tube showing different methods of coupling; Figs. 6
and 8 are end views of the same; and Figs. 9, 10 and 11 are sectional views of
strengthened tubes.
Fig. 1 illustrates the method by which screw threads, inclines, or other formations
are formed on a glass tube that has been previously plain: a, being a hinged mould
and 6 the completed tube with the screw thread c formed thereon. The plain tube
being heated is inserted in the closed mould, and air under pressure being now
admitted into the interior of the tube will cause it to expand and assume the
formation of the interior of the mould as illustrated.
Figs. 2 and 3 show the manner of producing a threaded glass tube by the pressing
and blowing process, a being the hinged blowing mould, & the inner parison or
pressing mould, e the pressing plunger, and the completed parison tube ;
(Fig. 3) is a box base plate for the reception and seating of the blowing mould
during the blowing operation and containing internally a cavity ; i, is the com-
bined mould cover and blowing apparatus furnished with an asbestos or other
suitable jointing j capable of making pressure-tight joint with the upper surface
of mould.
The method of forming a threaded tube by the above described apparatus is
as follows: The pressing mould d and blowing mould a being in the position
shown by Fig. 2, molten metal is charged into the cavity formed in the upper
portion of parison mould; the pressing plunger now descending will cause the
molten metal to assume the formation illustrated by Fig. 2 at f; the pressing
mould now being withdrawn and the blowing mould being placed in position on the
box base g, air under pressure is admitted by the blowing apparatus i into the
interior of the parison tube expanding it and causing it to assume the form shown
by Fig. 3.
The monld being now opened, the tubo can be taken from the mould and the
burst-off portion by suitable means removed, which will complete the formation of
the glass tube. Or the two ends of a tube can be made separately by the pressing
process alone, and after being relicated can be joined together. In Fig. 4, a
plain length of tubing after being heated is placed in the blowing mould and
expanded by air pressure to the configuration shown, after which the mould can
be opened, the tube taken out, and the ends removed. In some cases it may be
preferable to form the screw thread by means of tools, such tools carrying dies for
forming the outside screw thread and a suitable plug for forming the inside of the
tube. Figs. 5, 6, 7 and 8 show side and end views of ends of tubes having interrupted
screw threads and inclined planes respectively, but it will be evident that other

page_text: forms of screw threads, inclined planes, or other formations can be produced
by the above described processes of pressing, pressing and blowing combined,
blowing alone, or by the use of screw tools. Figs. 9, 10, and 11 are sectional
views of tube showing a few out of the many ways by which it is possible to add
greatly to the strength of a glass tube without adding materially to the weight of
the same.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
:-
1. The formation of screws on the ends of tubes by the reheating and blowing
process as described with reference to Fig. 1.
2. The formation of screws, inclines, or interrupted screw threads, by the
heating and blowing process as described with reference to Figs. 1, 5, 6, 7, and 8.
3. The formation of screws by the pressing and blowing process in combination
with the box for forming the "burst off" as shown and described by Figs. 2 and 3.
4. The manufacture of a glass tube having a screw thread or other formation at
cach end, by first drawing the tube, and whilst still in a plastic condition blowing
it in a mould as shown by reference to Fig. 4.
5. The improved mould for the manufacture of a glass tube having screws or
other formations at each end as shown by reference to Figs. 3 and 4.
Dated this 22nd day of April 1891.
DAN RYLANDS.
ALFRED HUSSELBEE.