IMPROVEMENTS IN OR APPERTAINING TO MACHINES FOR CRUSHING OR BREAKING STONES OR OTHER ARTICLES."
Year: 1880

page_text: LETTERS PATENT to Squire Marshall, of Leicester, in the County of Leicester,
for an Invention of "IMPROVEMENTS IN OR APPERTAINING TO MACHINES
FOR CRUSHING OR BREAKING STONES OR OTHER ARTICLES."
PROVISIONAL SPECIFICATION left by the said Squire Marshall at the
Office of the Commissioners of Patents on the 13th May 1880.
SQUIRE MARSHALL, of Leicester, in the County of Leicester.
"IMPROVEMENTS
IN OR APPERTAINING TO MACHINES FOR CRUSHING OR BREAKING STONES OR
OTHER ARTICLES."
In stone crushing machines, it is well known that a difficulty exists in enabling
them to clear themselves; the reason being that the flutes of the jaws are usually
made parallel, so that when stones and other things have been crushed by the
approach of the jaws, they stick in the flutes and it takes much power to clear
them.
Now my Invention consists essentially in forming these flutes so that they may be
able to clear themselves, and I accomplish this in the following simple manner :-
I take a pair of jaws, say, of the ordinary construction, but instead of making the
flutes parallel, as usual, I make them wider as they approach the bottom, so that
the crushed materials readily drop down, and by this means I save much time and
power and, therefore, expense.
It will be seen that this improvement is applicable to most of the stone crushing
machines as usually constructed.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, and of
an order of the Lord Chancellor, filed by the said Squire Marshall in the
Great Seal Patent Office on the 13th December 1880.
SQUIRE MARSHALL, of Leicester, in the County of Leicester.
"IMPROVEMENTS
IN OR APPERTAINING TO MACHINES FOR CRUSHING OR BREAKING STONES OR
OTHER ARTICLES."
In stone crushing machines it is well known that a difficulty exists in enabling
them to clear themselves; the reason being that the flutes of the jaws are usually
made parallel, so that when stones and other things have been crushed by the
approach of the jaws, they stick in the flutes, and it takes much power to clear
them.
Now my Invention consists essentially in forming these flutes so that they may
be able to clear themselves, and I accomplish this in the following simple manner:-
I take a pair of jaws, say, of the ordinary construction, but instead of making the
flutes parallel, as usual, I make them wider as they approach the bottom, so that
the crushed materials readily drop down, and by this means I save much time and
power and, therefore, expense. It will be seen that this improvement is applicable
to most of the stone crushing machines as usually constructed.
I
Having now described my Invention, and the method of performing the same,
wish it to be understood that what I claim and desire to protect under the
hereinbefore in part recited Letters Patent is,-
The bereindescribed improved construction of jaws for machines for crushing
stones and other materials, in which the flutes of said jaws are formed wider
towards their lower ends than above, to facilitate the passage of the materials operated
upon, substantially as and for the purposes set forth.
In witness whereof, I, the said Squire Marshall, have hereunto set my hand
and seal, this Thirteenth day of December, in the year of our Lord One
thousand eight hundred and eighty.
Witness,
ALFRED J. BOULT,
Of the firm of Wm. P. Thompson, & Co.,
323, High Holborn,
London.
SQUIRE MARSHALL. (L.S.)