IMPROVEMENTS IN MACHINERY OR APPARATUS FOR BREAKING STONES AND FOR CRUSHING ORES AUD OTHER HARD AND BRITTLE SUBSTANCES
Year: 1871

page_text: LETTERS PATENT to Henry Rowland Marsden, of Leeds, in the
County of York, Engineer, for the Invention of "IMPROVEMENTS IN
MACHINERY OR APPARATUS FOR BREAKING STONES AND FOR CRUSHING ORES
AUD
OTHER HARD AND BRITTLE SUBSTANCES.”
Sealed the 21st November 1871, and dated the 6th July 1871.
PROVISIONAL SPECIFICATION left by the said Henry Rowland Marsden
at the Office of the Commissioners of Patents, with his Petition,
on the 6th July 1871.
"
FOR
I, HENRY ROWLAND MARSDEN, of Leeds, in the County of York,
"IM
Engineer, do hereby declare the nature of my said Invention for "
PROVEMENTS IN MACHINERY OR APPARATUS POR BREAKING STONES, AND
CRUSHING ORES AND OTHER HARD AND BRITTLE SUBSTANCES," to be
follows:-
as
This Invention relates to certain improvements in the jaws of what
are known as Blake's stone breakers, for which Letters Patent were
granted to John Henry Johnson on the Fourteenth day of June One

page_text: thousand eight hundred and fifty-eight, No. 1346, and consists in
curving forward slightly the lower part of the fixed jaw so as to present
a concave surface at that part, and in rounding off the corresponding
portion of the moveable jaw, so as to enable the convex part so formed
to fit into the concave part of the fixed jaw when brought together.
The V ridges usually made on the acting faces of these jaws are inclined
sideways at a slight angle at the concave and convex portions of the
respective jaws, so as to cross each other at those parts and thereby
leave free passage for the broken fragments, whilst the concave curving
of the fixed jaw effectually prevents the passage of slates or other thin
flat substances through the machine without being broken, whilst the
stone is broken into a shape which renders it peculiarly applicable for
road making purposes.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Henry Rowland Marsden in the Great Scal Patent
Office on the 3rd January 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
ROWLAND MARSDEN, of Leeds, in the County of York, Engineer, send
grecting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixth day of July, in the year of our
Lord One thousand eight hundred and seventy-one, in the 35th year
of Her reign, did, for Herself, Her heirs and successors, give and grant
unto me, the said Henry Rowland Marsden, Her special license that
I, the said Henry Rowland Marsden, my executors, administrators, and
assigns, or such others as I, the said Henry Rowland Marsden, my
executors, administrators, or assigns, should at any time agree with,
and no others, from time to time and at all times thereafter during
the term therein expressed, should and lawfully might make, use,
exercise, and vend, within the United Kingdom of Great Britain and
Ireland, the Channel Islands, and Isle of Man, an Invention for "Iм-
PROVEMENTS IN MACHINERY OR APPARATUS FOR BREAKING STONES AND FOR CRUSHING
ORES AND OTHER HARD AND BRITTLE SUBSTANCES," upon the condition
(amongst others) that I, the said Henry Rowland Marsden, my exe-
cutors or administrators, by an instrument in writing under my hand and

page_text: seal, should particularly describe and ascertain the nature of the said
Invention, and in what manner the same was to be performed, and
cause the same to be filed in the Great Scal Patent Office within six
calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said Henry Rowland Marsden, do
hereby declare the nature of my said Invention, and in what manner
the same is to be performed, to be particularly described and ascertained
in and by the following statement, reference being had to the accom-
panying Drawings, and to the letters and figures marked thereon, that
is to say :-
My said Invention relates to certain improvements in the jaws of
what are known as Blake's stone breakers, and consists in curving
forward slightly the lower part of the fixed jaw so as to present a concave
surface at that part, and in rounding off the corresponding portion of
the moveable jaw, so as to enable the curved part so formed to fit into
the lower part of the fixed jaw when brought together. The ridges
usually made on the acting faces of these jaws are inclined sideways at
a slight angle at the concave and convex portions of the respective
jaws, so as to cross each other at those parts and thereby leave free
passage for the broken fragments, the concave curving of the fixed jaw
effectually preventing the passage of slates or other thin flat substances
through the machine without being broken, whilst the stone is broken
into a shape which renders it peculiarly applicable for road making
purposes.
And in order that my said Invention may be fully understood 1 shall
now proceed more particularly to describe the same, and for that purpose
shall refer to the several Figures on the annexed Sheet of Drawings,
the same letters of reference indicating corresponding parts in all the
Figures.
Figure 1 of my Drawings represents a longitudinal vertical section,
and Figure 2 a transverse vertical section of one of Blake's stone
breaking machines with my improvements applied thereto.
A is the fixed jaw, and B the moveable jaw; a represents the outward
curved or concave shape which I propose to impart to the bottom of
the fixed jaw; and 6 represents the reverse or convex curved shape of
the corresponding part of the moveable jaw B, the convex curved
surface being so made as to fit into the concave curved surface a, as

page_text: clearly shewn in Figure 1. c, c, (Figure 2) represent the usual V ridges
and furrows formed in the acting faces of the jaws A and B, and to the
lower ends of these ridges and furrows, I impart a lateral curve as repre-
sented from.d fo e in Figure 2, the lateral curve of the ridges in one jaw
being in the reverse direction to the lateral curve in the other jaw, as
will be seen by the dotted curved lines in Figure 2.
Having now described and particularly ascertained the nature of my
said Invention, and the manner in which the same is or may be used
or carried into effect, I would observe in conclusion that what I consider
to be novel and¯ original and therefore claim as the Invention secured-|
to me by the herein-before in part recited Letters Patent is, the peculiar
formations of the lower portions of the fixed and moveable jaws of what
are known as Blake's stone breaking machines as and for the purpose
hercin-before described.
In witness whereof, I, the said Henry Rowland Marsden, have
to this my Specification set my hand and seal, this Twenty-
ninth day of December One thousand eight hundred and seventy-