Improvements in or relating to Brake Blocks.
Year: 1890

page_text: Date of Application, 1st Sept., 1890
Complete Specification Left, 1st June, 1891-Accepted, 4th July, 1891
PROVISIONAL SPECIFICATION.
Improvements in or relating to Brake Blocks.
I, THOMAS EDWARD CADDY, of Caddy & Company, Limited, of Daybrook,
in the County of Nottingham, Engineers, do hereby declare the nature of this
invention to be as follows:-
This invention relates to metal brake blocks used more especially in peripheral
contact with the wheels of rolling stock and it has for its object the manufacture of
such brake blocks so as to resist the wear better than heretofore.
In carrying out this invention that part of the brake block which is subject to
wear is chilled in the process of casting to a considerable depth forming a very
hard wear resisting part to withstand the friction it is subject to by the wheel. To
produce the chill employ a curved metal plate or a flat plate with a raised part
corresponding to the curve of the wearing surface of the block and formed
preferably with flanges on cach side; when moulding the pattern may be placed
on the curved plate together with a moulding box the latter of which enters into
engagement with pins secured to the plate to secure re-adjustment in a well known
manner. The moulding box is then filled with sand and rammed after which it is
removed from the plate and the pattern withdrawn when the moulding box con-
taining the mould is again put on the plate. The mould is thus formed with metal
at that part which corresponds to the part it is desired to chill and the remainder
of sand.
The sand part of the moulds may also be formed by employing a pattern with a
part corresponding to the chill plates, or in a specially adapted moulding machine
provided with a plate through which the pattern projects corresponding to the
shape of the chill plates, to which they are afterwards removed for casting.
Dated this 1st day of September 1890.
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Brake Blocks.
1 THOMAS EDWARD CADDY, of Caddy and Company Limited, Daybrook, in
the County of Nottingham, Engineer, do hereby declare the nature of this inven-
tion 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 metal brake blocks used more especially in peripheral
contact with the wheels of rolling stock and it has for its object the manufacture of
such brake blocks so as to resist the wear better than heretofore.
In carrying out this invention that part of the brake block which is subject to
wear is chilled in the process of casting to a considerable depth forming a very
hard wear resisting part to withstand the friction it is subject to by the wheel. To
produce the chill I employ a curved metal plate or a flat plate with a raised part
corresponding to the curve of the wearing surface of the block and formed
preferably with flanges on each side; when moulding the pattern may be placed
on the curved plate together with a moulding box the latter of which enters into
engagement with pins secured to the plate to secure readjustment in a well known
manner. The moulding box is then filled with sand and rammed, after which it is
removed from the plate and the pattern withdrawn when the moulding box cou-
taining the mould is again put on the plate. The mould is thus formed with metal

page_text: at that part which corresponds to the part it is desired to chill and the remainder
of sand.
In some cases the chill plate with the pattern of the brake block may be placed
together in a moulding box in the ordinary manner: the pattern being reinoved
and the chill plate left in the sand to form part of the mould.
The sand part of the moulds may also be formed by employing a pattern with a
part corresponding to the chill plates, or in a specially adapted moulding machine
provided with a plate through which the pattern projects corresponding to the
shape of the chill plates; to which they are afterwards removed for casting.
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
1. A brake block with the part which is subject to wear chilled substantially as
described.