Improvements in the Manufacture of Covers or Treads for Pneumatic Tyres.
Year: 1894

page_text: Date of Application, 24th Sept., 1894
Complete Specification Left, 13th July, 1895-Accepted, 17th Aug., 1895
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Covers or Treads for
Pneumatic Tyres.
We, JOSEPH MOSELEY, Indiarubber Manufacturer, and BENJAMIN BLUND-
STONE, Manager, both of The Chapelfield Works, Ardwick, Manchester, in the
County of Lancaster, do hereby declare the nature of this invention to be as
follows:-
The object of our invention is the manufacture of an endless cover or tread for
pneumatic tyres, free from joints and fins.
We construct the mould in which the cover is first partly vulcanised, of two
concentric rings between the contiguous faces of which the matrix is formed. The
primitive rings, or the rings before the matrix is formed in one or both of them,
have their contiguous faces parallel and slightly coned, so as to allow the inner or
outer part of the mould to be lifted for the removal of the cover or tread.
We do not limit ourselves to any particular method of vulcanisation, but usually
we prefer to form the rings with internal annular cavities into which live steam may
be admitted. When the vulcanisation has sufficiently progressed, by the aid of
this steam, the mould may be opened and the tread or cover may be removed and
placed on a "former" where its vulcanisation may be completed.
Dated this 22nd day of September A.D. 1894.
WILLIAM E. HEYS,
Agent for the Applicants.
Improvements in the Manufacture of Covers or Treads for
Pneumatic Tyres.
We, JOSEPH MOSELEY, Indiarubber Manufacturer, and BENJAMIN BLUND-
STONE, Manager, both of The Chapelfield Works, Ardwick, Manchester in the
County of Lancaster, 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 :—
The object of our invention is the manufacture of an endless cover or tread for
pneumatic tyres, free from joints and fins.
We construct the mould in which the cover is first partly vulcanised, or in which
it may be completely vulcanised, of two concentric rings, between the two
contiguous faces of which the matrix is formed. The primitive rings that is to say
the rings before the matrix is formed in one or both of them, have their contiguous
faces parallel and slightly coned, so as to allow the inner or outer part of the mould
to be lifted for the removal of the cover or tread.
We do not limit ourselves to any particular method of vulcanisation, but prefer
to form the rings with internal annular cavities into which steam may be admitted.
When the vulcanisation has been completed or has sufficiently progressed by the

page_text: aid of this steam, the mould may be opened, and the tread or cover may be removed,
and, if necessary, be placed on a "former" where the vulcanisation if incomplete
in the mould, may be completed.
In order that our invention may be more fully understood we have appended a
sheet of drawings to which reference will hereinafter be made.
Figure 1 of these drawings represents a vertical section of the mould, and
Figure 2 a plan.
As hereinbefore described, the mould consists of two separate concentric rings A
and B. The matrix for the indiarubber cover or tread is preferred to be formed
in the outer face of the inner ring A, but it may, alternatively, if desired, be formed
in the inner face of the outer ring, or partly in each of the two contiguous faces.
Before the matrix A' is formed, the two contiguous faces are parallel as shewn in
Figure 1, and they are slightly coned or tapered as shewn, so that either one may
be readily withdrawn from the other. In practice, we find it better to lift the outer
ring B, for which purpose it may be provided with eye bolts, or lifting hooks may
be engaged with the projecting flange F. The two rings are secured together when
in use, by the bolts D, which are pivoted at their lower ends to the lower part of
the inner ring A. They may engage in slots cut in the periphery of the flange F
as shown by Figure 2, which reduces the operation of tightening and slackening the
nuts G.
In forming a tread according to this invention, the requisite quantity of rubber
compound is placed in the matrix, the rings having been separated for this purpose.
The outer ring B is then lowered and secured in place. Each ring being provided
with annular cavities R R' as hereinbefore described, and, as indicated by Figure 1,
steam is admitted to these cavities at a sufficient pressure and for a sufficient time
to produce the degree of vulcanisation required. This accomplished, the steam is
cut off and the outer ring is removed, when the tread or cover may be taken from
the mould.
If it be desired to complete the formation of the tread or cover on a "former" in
the known manner, the vulcanisation in the mould is arrested at the proper time,
and the partly vulcanised article is transferred from the mould to the "former."
A tread or cover constructed as described and by the means set forth and
illustrated, may be perfectly smooth, and has no fins or joints on its surface. Any
desired pattern or device may be formed in the matrix so as to be reproduced upon
the surface of the finished article.
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 :-
The hereinbefore described improvements in the manufacture of treads or covers
for pneumatic tyres which consist in vulcanising or partly vulcanising them in a
mould having a matrix formed in one or both of the contiguous faces of two
concentric rings, the faces of the rings being slightly coned or tapered, substantially
as set forth with reference to the accompanying drawings.
Dated this 12th day of July A.D. 1895.
WILLIAM E. HEYS,
Agent for the Applicants.