Improvements in the Construction and Manufacture of Screw- necked Bottles, Jars, and the like.
Year: 1889

page_text: Date of Application, 30th Aug., 1859-Accepted, 5th Oct., 1889
Improvements in the Construction and Manufacture of Screw-
necked Bottles, Jars, and the like.
THOMAS SUTCLIFFE Pleasant Grove, York Road Kings Cross, London, Middlesex
Stopper Manufacturer 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 :-
This Invention relates to the Improvements in the construction of Bottles, Jars
and the like having a screw thread on the outside of the neck or mouth.
The screw thread which is formed in the bottle-mould has a contracted part just
above it which is also formed in the bottle-mould. A thin ring of molten glass is cast
on the contracted part and tooled with an ordinary bottle tool forming a perfect
smooth & level surface at the top of the said screw thread which will not cut or in any
way injure the washer if one is used inside the cap, the said cap acting as a stopper
also saving labour not having to grind the top of the thread level as,
the screw-necked bottles now in use known in the trade as Burst-offs.
the case with
This Invention relates to the construction and manufacture of that class of glass
Bottle, Jar and the like having a screw thread on the outside of the mouth or neck
whereby the said glass bottle, jar or the like will be made and finished on a cheaper
principle than has hitherto been adopted.
One way of making this class of bottle jar or the like is as follows:-The bottle is
blown in the mould to any required shape, it is then wet off i.e. broken off from the
blow-pipe, this done the bottle-maker takes the bottle up in his punty and casts a
ring of molten glass on the neck of the said bottle, he then uses a special tool on the
ring of molten glass in such manner that a thread is formed on the neck of the bottle,
this system however requires some skill and practice and the bottle-maker does not
then get all the screw rings an exact diameter, not only this, but, if it is a square,
oval or any other shaped bottle that cannot be rolled on a rolling plate the screw ring
would go out of shape if the bottle was thrown out of the punty too soon, therefore
the bottle-maker has to keep on tooling the bottle until the molten glass is set. This
makes the process rather slow.
Another way of manufacturing these screw necked bottles, jars and the like is as
follows: After being blown in a mould having a screw thread cut round the neck
the bottles are left with a rough edge where they are burst off from the blow-pipe
just above the thread as shown at letter A in fig. 1. in the accompanying drawings.
After the bottle has been annealed the rough edge A which is thus left has to be ground
or rubbed off level with a stone or wheel so that the screw cap which is used as a
stopper will fit down on the top of the bottle neck and after going through this
expensive process of grinding or rubbing off the edge is then often rough and cuts the
washer if one is used inside the cap, so that after using once or twice the cap will
not make a perfect joint with the top of the bottle. The above relates to what is
known in the trade as burst-offs.
By my improvements the cost of the bottles complete will be just the same as the
cost of making the bottles here-in-before described before they are ground and finished
and will be by far more reliable than the ground bottles as they cannot cut or in any
way injure the washer if one may be used inside the cap as the top of the bottle will
be just as smooth as any other part of the bottle. Further-in making my improved
screw thread it will not in any way differ with the ordinary style of bottle-making as
no special tool will be required. The bottles will be made just as easily as a common
mouthed pickle or confectioner bottle.
I will now describe my way of making these screw threads on the outside of bottle
necke
Lout o carathon und the most in the bottle mould but inst above the

page_text: thread I form a contracted part as shown on the bottle or jar at letter C in fig. 2.
after the bottle has been blown in the mould it is wet off i.e. broken away from the
blow-pipe just above the contracted part. The bottle maker then casts a ring of
molten-glass on the contracted part here-in-before mentioned just above the screw
thread and tools it with a common mouth tool making them just as fast as an ordinary
bottle and will cost no more in making whether the bottles are square, oval or any
other shape, thus leaving the bottle neck with a screw thread having a smooth ring
just above the thread as shown at letter D in fig. 3. It will therefore be seen that by
casting this small ring of molten glass just above the screw thread the said screw
thread having been formed in the mould the ring takes so little tooling that the molten
glass sets very quickly therefore it will keep in shape after the bottle is thrown from the
bottle-maker's punty this is a great advantage especially in square, oval or any shape
besides round bottles. The ring on top of the screw thread stiffens so quickly that
the bottle hands can turn these bottles out in the same time as the common mouthed
bottles.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is :-
The improvements in the construction and manufacture of screw-necked Bottles
Jars and the like as here-in-before described and illustrated by the drawings
annexed.
THOMAS SUTCLIFFE.