IMPROVEMENTS IN THE JAWS FOR STONE BREAKING MACHINES
Year: 1872

page_text: LETTERS PATENT to Henry Rowland Marsden, of Leeds, in the
County of York, for the Invention of "IMPROVEMENTS IN THE JAWS
FOR STONE BREAKING MACHINES."
Sealed the 22nd November 1872, and dated the 8th July 1872.
PROVISIONAL SPECIFICATION left by the said Henry Rowland Mars-
den'at the Office of the Commissioners of Patents, with his Petition,
on the 8th July 1872. .
I, HENRY ROWLAND MARSDEN, of Leeds, in the County of York,
do hereby declare the nature of the said Invention for "IMPROVEMENTS
IN THE JAWS FOR STONE BREAKING MACHINES," to be as follows:-
This Invention relates to a peculiar construction and arrangement of
the ridges and recesses on both the fixed and moveable jaws of stone
breaking machines, and consists in extending the ordinary ridges and
recesses straight down the face of cach jaw to within a few inches of
the bottom, the lower portion of each jaw below the ends of the first-
mentioned ridges being formed with a second set of ridges and recesses.
The last-named ridges are each reduced to a point or apex at the upper
end, which points or apices coincide exactly with the lower ends of the

page_text: recesses or channels in the upper part of the jaw, so that the lower series
of ridges coincide with the upper series of recesses. These upper and
lower series of ridges and recesses are also so arranged in the two jaws
that when closed the upper and lower ridges of one jaw enter the upper
and lower recesses or channels in the oposite jaw. That part of the
moveable jaw on which the lower series is formed is made to recede or
incline backwards slightly from the general face of the jaw, so that when
the jaw is closed its lower part will be in a vertical position.
improved construction of jaws I obtain a more efficient breaking action
on the stone or other hard substances operated upon.
By this
1
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Henry Rowland Marsden in the Great Seal Patent
Office on the 4th January 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
ROWLAND MARSDEN, of Leeds, in the County of York, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eighth day of July, in the year of our
Lord One thousand eight hundred and seventy-two, in the 36th 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 "IMPROVEMENTS IN
THE JAWS FOR STONE BREAKING MACHINES," upon the condition (amongst
others) that I, the said Henry Rowland Marsden, my executors or
administrators, by an instrument in writing under my hand and seal,
should particularly describe and ascertain the nature of the said In-
vention, and in what manner the same was to be performed, and cause
the same to be filed in the Great Seal Patent Office within six calendar
months next and immediately after the date of the said Letters
Patent.

page_text: 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 accompanying
Drawings, and to the letters and figures marked thereon, that is to
say:-
My said Invention relates to a péculiar construction and arrangement
of the ridges and recesses on both the fixed and moveable jaws of stone
breaking machines, whereby a better cubing of road metal is effected,
and consists in extending the ordinary ridges and recesses straight down
the face of each jaw to within a few inches of the bottom, the lower
portion of each jaw below the ends of the first-mentioned ridges being
formed with a second set of ridges and recesses. These last-named
ridges are each reduced to a point or apex at the upper end, which
points or apices coincide exactly with the lower ends of the recesses or
channels in the upper part of the jaw so that the lower series of ridges
coincide with the upper series of recesses. These upper and lower
series of ridges and recesses are also so arranged in the two jaws that
when closed the upper and lower ridges of one jaw enter the upper
and lower recesses or channels in the opposite jaw. That part of the
moveable jaw on which the above-named lower series of ridges and
recesses is formed is made to recede or incline backward slightly from
the general face of the jaw, so that when the jaw is closed this part will
be in a vertical or nearly vertical position, a corresponding projecting
portion being made in the fixed jaw. In some cases a third set of ridges
and recesses are formed along the bottom of both jaws, which set
correspond in lateral position to the first set, that is to say, they are in
a line therewith. By this improved construction of jaws I obtain a
more efficient breaking and cubing action on the stone or other hard
substances operated upon.
And in order that my said Invention may be fully understood, I 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 represents a vertical section of my improved fixed and
moveable jaws for cubing road metal in stone breaking machines, the
jaws being shewn open; Figure 2 is a front or face view of the moveablo

page_text: jaw detached, and Figure 3 is a top view or plan of the two jaws
combined together and corresponding to Figure 1.
A is the moveable jaw, and B the fixed jaw, which may be composed
each of one piece of metal (as shewn in my Drawings), or may be made
up of several pieces or parts put together as preferred, but in either case
the acting face of each jaw is grooved or channelled longitudinally so as
to form a series of alternate ridges a, a¹, and furrows or recesses b, b,
extending in unbroken lines from the top of the acting face of each jaw
down to within a few inches of the bottom thereof, and by preference,
but not of necessity, so disposed on the two jaws as that the ridges a on
the moveable jaw A shall coincide with or be opposite to the furrows b¹
A second set of
of the fixed jaw B, as shown in Figure 3, or vice versa.
ridges c and furrows & are formed in the moveable jaw (see Figure 2)
below the lower ends of the first-mentioned ridges and furrows a and b,
and these last-mentioned ridges c, c, are each reduced to a point or
apex c¹ at the upper end, such point being so placed as to coincide with
and disappear in the first-mentioned furrows b, b, as shewn clearly at c¹
in Figure 2, whilst the ridges a, a, in the upper part of the jaw coincide
or are in line with the furrows d of the second set, the one set being
thus made to break joint with the other set. If desired the second set
of ridges and furrows c and d may terminate the jaw, but I prefer as
shewn in my Drawings to employ a third set of ridges e and furrows f
beneath and breaking joint with the second set as will be clearly
understood on referring to Figure 2, where the ridges e are shewn as
terminating at their upper ends in points or apices e¹ which coincide
with and disappear in the furrows d of the second set. That portion of
the jaw which contains the second set of ridges and furrows c and d is
angled or made to recede or incline backwards from the upper part
of the acting face of the jaw as shown clearly at g in Figure 1, whilst
the lowest part of the jaw which contains the third set of ridges and
furrows e and f is continued in a plane parallel to the general plane of
the upper portion of the working face of the jaw, as shewn at hin
Figure 1. The fellow jaw is formed with a projecting angled portion g
corresponding with the receding angled portion g in the first-mentioned
jaw, the part g' containing the second set of ridges and furrows in the
fixed jaw so that the two jaws will fit together as their respective angled
portions g and g¹ are reversed. is the part which corresponds to the
part in the moveable jaw.

page_text: Having described the peculiar conformation of the entire acting face
of the moveable jaw, it is simply necessary to remark that the acting
face of the fixed jaw B is by preference the exact converse thereof, it
having the ridges and furrows of the three sets so disposed as that those
on the one jaw will interlock with those on the fellow jaw, no two ridges
or furrows on the two jaws coming opposite to each other. C is the
opening for the reception of the fulcrum pin or centre of oscillation of
the moveable jaw, and D is the notch for receiving the end of one of
the actuating toggles.
Having now described and particularly ascertained the nature of my
said Invention, and the manner in which the same is to be performed,
I would observe in conclusion that I am aware that it has been proposed
to make one only of a pair of jaws for a stone breaking machine with a
break or second set of ridges and recesses near the lower end of the jaw,
which break joint with the main ridges and recesses in the upper part
of the same jaw, also to form the jaws with angled portions or offsets at
their lower parts, and therefore I lay no claim separately to such modes
of construction; but 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 construction and use of stone
breaking machines wherein both the fixed and moveable jaws are made
with corresponding receding and projecting angled portions g and g¹ on
their acting faces, and with one or more breaks in the ridges and recesses
of both jaws, the whole being arranged and combined together
substantially as herein-before described and illustrated by my Drawings.
In witness whereof, I, the said Henry Rowland Marsden, have to
this my Specification set my hand and seal, the First day of
January One thousand eight hundred and seventy-three.
HENRY ROWLAND MARSDEN. (L.S.)