Improvements in the Construction of Moulds for Vulcanizing India Rubber Tyres and other Rings.
Year: 1892

page_text: he decision of the Comptroller-General, of the 24th day of April 1893, allowed,
under Section 18 of the Patents, &c. Act, 1883, an Amendment of this
Specification.
Date of Application, 28th May, 1892
Complete Specification Left, 23rd Sept., 1892-Accepted, 29th Oct., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Moulds for Vulcanizing India
Rubber Tyres and other Rings.
1 HARRY HERBERT WADDINGTON of Spring Bank Mills Hyde in the County
of Chester, India Rubber Manufacturer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to improvements in the construction of the moulds
employed for the vulcanization of india rubber tyres and other similar rings of
india rubber, either solid or hollow, the objects of the invention being to allow a
free circulation of the steam through and around the moulds, and for hollow tyres
or rings, such for example as cushion or pneumatic tyres, to prevent the access of
the steam to the surface of the tyre or ring being vulcanized.
For the purposes of my invention for solid tyres or rings 1 form the annular
metal boxes of which the mould is composed (either solid or cored out hollow)
preferably with several semicircular grooves of different diameters one within the
other to receive the tyres or rings of various sizes, and with a series of vertical
openings through the said metal rings or boxes between each groove for the
passage of steam, the lowest ring of the pile forming the mould being provided
with a steam inlet passage communicating with all the vertical openings so as to
admit steam to the interior of all the rings or annular boxes forming the mould, the
top of the mould may be either opened or closed.
The faces between the grooves holding the tyres or rings I dish out slightly so as
to obtain a sharp line of junction between the rings forming the mould.
For cushion or pneumatic tyres or other hollow or tubular rings form the
annular metal boxes or rings in a similar manner, cored out hollow, and with
vertical openings between the said rings to allow the steam to pass from the
interior of one annular box or ring to the other, and in order to prevent the steam
from obtaining access to the tyres or rings being vulcanized I cut or form corre-
sponding grooves in the upper and lower faces of the metal rings between the steam
openings and the grooves of the mould, and also between the steam openings and
the exterior of the mould, and in these grooves (half in one ring and half in the
other) I place packing rings of india rubber asbestos or other suitable material
which effectually prevent the passage of the steam either inwards or outwards
between the annular boxes forming the mould.
I preferably dovetail the lower grooves so that they will retain the packing rings
when the annular boxes are separated to remove the tyres or other rings after
vulcanization.
Dated this 27th day of May 1892
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.

page_text: COMPLETE SPECIFICATION. (AMENDED).
Improvements in the Construction of Moulds for Vulcanizing India
Rubber Tyres and other Rings.
I HARRY HERBERT WADDINGTON of Spring Bank Mills Hyde in the County
of Chester, India Rubber 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 improvements in the construction of the moulds
employed for the vulcanization by steam of india rubber tyres and other similar
rings of india rubber, either solid or hollow, the objects of the invention being to
allow a free circulation of the steam through and around the moulds, and, for
hollow tyres or rings, such for example as are known as "cushion" or "pneumatic'
tyres, to prevent the access of the steam to the surface of the tyre or ring being
vulcanized.
"
The nature of my said invention and the manner in which the same is to be
performed or carried into practical effect will be readily understood on reference
to the sheet of drawings hereunto annexed and the following explanation
thereof.
Fig. 1 is a partial plan view and Fig. 2 a partial vertical section illustrative of
my invention as applied to the steam vulcanization of solid india rubber tyres or
rings.
Fig. 3 is a partial vertical section illustrating the application of my invention to
the vulcanization of pneumatic or hollow tyres or rings and
Fig. 4 is a similar view of a modification thereof hereinafter described.
According to my invention for vulcanizing solid tyres or rings I form the metal
boxes A of which the mould is composed preferably solid, as seen at Figs. 1 and 2
in which latter the bottom box A¹ is in the form of a disc or plate and provided
with a steam inlet a. The top one of the series may also be similarly formned and
provided with a steam outlet, or the top mould may be left open.
The boxes (whether solid or cored out) are made with several semicircular
annular grooves of different diameters, one within the other to receive tyres or
rings of various sizes, and with a series of vertical openings c through the said
metal rings or boxes A between each two grooves b for the passage of the steam
from one to the other, the lowest ring A' of the series forming the complete mould
being provided with a steam inlet passage a communicating with all the vertical
openings c (as shown at Fig. 2) so as to admit steam to the interior of all the rings
or annular boxes forming the mould the top of the mould being, as before stated,
either open or closed.
The faces d between the grooves ò holding the tyres or rings I dish out slightly
(as seen at Fig. 2) so as to obtain a sharp line of junction between the rings or
boxes forming the mould.
For cushion
وو
66
or pneumatic" tyres, or other hollow or tubular rings I form
the annular metal boxes or rings in a similar manner as shown at Fig. 3 preferably
cored out hollow and with vertical openings c between the said rings to allow the
steam to pass freely from the interior of one annular box or ring A to the other,
and in order to prevent the steam from obtaining access to the tyres or rings being
vulcanized I cut or form corresponding grooves e in the upper and lower faces of
the metal rings or boxes between the steam openings c and the semicircular
recesses of the mould, and also between the steam openings c and the exterior
of the mould, and in these grooves (half in one ring and half in the other) I place
packing rings of india rubber asbestos, or other suitable material, which effectually
prevents the passage of the steam either inwards or outwards between the annular
boxes A forming the mould.
I preferably dovetail the lower grooves as shown so that they will retain the

page_text: packing rings when the annular boxes or rings A are separated to remove the
tyres or other rings after vulcanization.
As a modification of the above in some cases I propose to make grooves e on the
upper face only of each ring (as shown at Fig. 4) and a corresponding annular
ridge or projection g on the lower face of each ring or box A, a ring of rubber or
other packing material being laid in the grooves.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed I declare that I am aware
that an assemblage of hollow annular moulds having inter-communicating steam passages
provided with packings for preventing the steam escaping or obtaining access to the
india-rubber and so shaped as to have sharp lines of junction have already been
described in the l'atent Specification of Joseph Kirkman Heywood No. 19636 of 1890
and I wish it to be understood that I do not claim anything described or claimed in the
said Specification of Joseph Kirkman Heywood, but what I claim is :-
First. The construction of moulds for steam vulcanizing india rubber tyres and
other rings by the superposition of a number of solid or hollow metal rings, or
boxes, having in their adjacent faces a series of semicircular annular recesses
between-which are formed a series of vertical steam openings substantially as
described and illustrated, the faces between the said recesses being slightly-dished
so as to obtain a sharp line of junction between the said rings or boxes forming the
mould, the bottom metal ring or box being formed solid and with a-steam-inlet
communicating with all the said vertical steam openings, and the top of the mould
being either similarly closed or left open.
Secondly. I claim, In moulds similarly constructed and intended for vulcanizing
cushion or pneumatic tyres (or other hollow or tubular rings) the construction and
use of the packing rings and grooves between the vertical steam openings and the
semicircular aunular recesses of the mould, and also between the said steam openings
and the exterior of the mould to prevent the access of the steam to the tyres or
rings being vulcanized, or its escape outwardly between the joints of the rings or
boxes, substantially as herein before described and illustrated by the drawings
annexed.
Dated this 22nd dow of Sentember 1809