improvements in moulas for the manufacture of Screw Stoppers.
Year: 1886

page_text: improvements in moulas for the manufacture of Screw Stoppers.
We, HENRY BARRETT, Stopper manufacturer, and JOHN JAMES VARLEY, Engineer,
both of No 268, South Lambeth Road, in the county of Surrey, 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 improvements in moulds for the manufacture of screw
stoppers from plastic material, the object of the improvements being to manu-
facture suclr stoppers without seams in a better manner than hitherto.
We manufacture such screw stoppers by means of improved moulds, consisting
of a block or plate provided with holes to receive a number of screwed hubs, a
middle plate having holes for the heads of the stoppers, and a top or press plate..
In the accompanying drawing figure 1 is a plan and figure 2 a section of the
block or plate, which is shewn by way of example provided with one hole to
receive a screwed hub shewn in plan and section at figures 3 and 4; figures 5 and 6
represent a plan and a section of the middle plate; figures 7 and 8 represent a
section and a plan of the underside of the top plate; figure 9 is a section of the
complete mould shewing a section of a moulded stopper therein; figure 10 is a
view of a stopper formed by our improved mould. Figures 11 and 12 are sections
respectively of the top plate and hub we employ when it is required to mould a
screw stopper with a hole through it such as is shewn in section at figure 13.
Similar letters in all the figures represent similar parts.
In the drawing, a, figures 1, 2 and 9 is the block or plate of iron or steel, and
b, is the hole therein to receive the hub c, figures 3, 4 and 9. In the drawing the
block or plate a, is shown with one hole only, but it will be obvious that in
practice a larger plate is employed with a number of holes. The hub c, consists of
a steel cylinder formed with a female screw d, of the size and shape to be given to
the screwed stem of the stopper shewn in figure 10, and with a recessed portion to
form the shoulder and neck of the stopper, and such hub truly fits the hole b, in
the plate a
The middle plate e, figures 5, 6, and 9, corresponds with the plate a,
and has holes f, which slide truly on the guides g, on the plate a.-In the centre
of the middle plate e, is a hole h, which is of the size and shape to be given to the
periphery of the head i, of the stopper. In the drawing this hole is shown circular
in shape and serrated, but it will be obvious that it may be octagonal or of other
suitable shape. The top plate ;, figures 7, 8 and 9, has holes k, corresponding with
the holes of the middle plate e; and, like them, truly fitting the guides g, of the

page_text: plate a. In the underside of the top plate is a hollowed part 7, to give the required
form to the top of the stopper.-m³, is an annular groove to allow of the overflow
of any excess of plastic material.
To manufacture a stopper by means of our improved moulds, the hub c, is
placed in the hole b, in the block or plate a, and the middle plate e, is placed on,
in the position shewn in figure 9. The composition m, to form the stopper is then
filled into the hub c, and hole h, and the top plate ;, is placed in position and
pressed down against the middle plate e, as shewn in figure 9, so as to mould the
composition into the required shape or form. The top plate j, is then removed, and
the middle plate e, being then raised from the plate a, draws with it the hub c,
with the moulded stopper, and from off which the hub is then unscrewed, leaving
the moulded stopper in the middle plate e, from which the stopper is then knocked
out. The serrations in the hole h, prevent the stopper turning while the hub is
being screwed off.
When our improved moulds are employed for the manufacture of vulcanite screw-
stoppers it will be obvious that the stopper is moulded from the dough or material
used in the manufacture of vulcanite, and, in some cases, is vulcanized or cured
before removal from the moulds or from the hub.
When it is required to mould a stopper with a hole through it as shown in
figure 13, we employ moulds similar to those hereinbefore described except that
the top plate j, and hub c, are each provided with a central pin or core as shewn
in figures 11 and 12 in which n, represents the pin on the top plate j, and o, the
pin in the hub c.
It will be obvious that in some cases the middle and top plates can be combined,
but we do not advise this arrangement.
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 improved moulds for the manufacture of screw stoppers arranged and
operating substantially as hereinbefore described and illustrated in figures 1 to 9
of the accompanying drawing.
2. The modification of our improved moulds for the manufacture of screw
stoppers with holes through them, arranged and operating substantially as heroin-
before described and partially illustrated in figures 11 and 12 of the accompanying
drawing.
3. In moulds for manufacturing screw-stoppers the subordinate combination
consisting of the hub with a female scrow thread and the plate for forming the
head of the stopper and holding it while it is screwed out of the hub, arranged and
operating substantially in the manner hereinbefore described.
4. In moulds for manufacturing screw stoppers the provision of the top plato
and hub with central pins for the purpose of producing screw stoppers with a
central hole through them substantially as described.
Dated the 12th day of November 1886.