IMPROVEMENTS IN PRESSING MACHINES. GENERALLY USED FOR SOLIDIFYING GRANULAR SUBSTANCES SUCH AS FIRE- CLAY, COAL DUST, OR ANY OTHER MATERIAL OF LIKE NATURE FOR MAKING BRICKS, TILES, FUEL BLOCKS, OR OTHER SIMILAR MATTERS."
Year: 1876

page_text: LETTERS PATENT to Herbert Guthrie, of Newburn, near Newcastle-upon-
Tyne, for the Invention of "IMPROVEMENTS IN PRESSING MACHINES.
GENERALLY USED FOR SOLIDIFYING GRANULAR SUBSTANCES SUCH AS FIRE-
CLAY, COAL DUST, OR ANY OTHER MATERIAL OF LIKE NATURE FOR MAKING
BRICKS, TILES, FUEL BLOCKS, OR OTHER SIMILAR MATTERS."
"IMPROVEMENTS
PROVISIONAL SPECIFICATION left by the said Herbert Guthrie at the Office
of the Commissioners of Patents, on the 3rd January 1876.
HERBERT GUTHRIE, of Newburn, near Newcastle-upon-Tyne.
IN PRESSING MACHINES GENERALLY USED FOR SOLIDIFYING GRANULAR SUBSTANCES
SUCH AS FIRE-CLAY, COAL DUST, OR ANY OTHER MATERIAL OF LIKE NATURE
FOR MAKING BRICKS, TILES, FUEL BLOCKS, OR OTHER SIMILAR MATTERS."
And, consists of a press with two dies, to which is given a continuous recipro-
cating movement through a fixed cylinder or mould.
The dust or granulated substance is supplied at one end of the cylinder, and
delivered in the form of a solid block at the other, the feeding and delivering being
both self-acting; one block being made to every revolution of an actuating shaft,
to which may be attached any number of such cylinders and pairs of dies.
The substance to be solidified is fed as a dust, or in a granular state through a
hopper into a measuring box, the cubic capacity of which may be varied as
required, such box being open at the top and bottom. The box moves upon a
table, and in sliding under the hopper receives the requisite measure of material to
be pressed. The measuring box thus filled then passes over the edge of the table
so as to discharge its contents into the cylinder or mould, the contents being pre-
vented falling through the cylinder by one of the dies, which I call the stopper
die; thereupon the second die, which I call the presser die, moves through the
cylinder, closing the mould and giving the necessary pressure for solidifying the
material, delivering the block after being thus pressed, and having traversed
through the cylinder on to a travelling band or oscillating table.
The motion of the dies is obtained by attaching them severally to rods, the other
ends of which are connected with two excentric points fixed on one main shaft at
an angle preferably of about forty-five degrees, and either at the same or slightly
different radii, so as to produce the motion by which at the early part of the
-

page_text: stroke the presser die travels at a quicker rate than the stopper die, and at the
latter part of the stroke the stopper die travels at a quicker rate than the
presser die.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Herbert Guthrie in the Great Seal Patent Office on the 13th June
1876.
HERBERT GUTHRIE, of Newburn, near Newcastle-upon-Tyne. "IMPROVEMENTS
IN PRESSING MACHINES GENERALLY USED FOR SOLIDIFYING GRANULAR SUB-
STANCES SUCH AS FIRE-CLAY, COAL DUST, OR ANY OTHER MATERIAL OF
NATURE FOR MAKING BRICKS, TILES, FUEL BLOCKS, OR OTHER SIMILAR
MATTERS."
LIKE
This Invention consists of a press with two dies, to which is given a continuous
reciprocating movement through a fixed cylinder or mould.
The dust or granulated substance is supplied at one end of the cylinder or
mould, and delivered in the form of a solid block at the other, the feeding and
delivering being both self-acting, one block being formed to every revolution of an
actuating shaft, to which may be attached any number of such cylinders and pairs
of dies.
The substance to be solidified is fed as a dust or in a granulated state through a
hopper into a measuring box, the cubic capacity of which box may be varied as
required, such box being open at the top and bottom. The box moves upon a
table, and in sliding under the hopper receives the requisite measure of material to
be pressed. The measuring box thus filled then passes over the edge of the table
so as to discharge its contents into the cylinder or mould, the contents being pre-
vented falling through the cylinder or mould by one of the dies, which I call the
stopper die; thereupon the second die, which I call the presser die, moves through
the cylinder, closing the mould, and giving the necessary pressure for solidifying
the material, delivering the block after being thus pressed, and having traversed
through the cylinder on to a travelling band or oscilating table.
The motion of the dies is obtained by attaching them severally to rods, the
other ends of which are connected with two eccentric points fixed on one main
shaft at an angle preferably of about fourty-five degrees, and either at the same or
slightly different radius, so as to produce a motion by which at the early part of
the stroke the presser die travels at a quicker rate than the stopper die, and at the
latter part of the stroke the stopper die travels at a quicker rate than the presser
die, thus gradually bringing the pressure upon the substance under manipulation
while moving through the cylinder, then gradually removing the pressure just
before it is expelled from the cylinder by the presser die, when it is caught by
the travelling band or oscilating table.
I do not confine myself to the perpendicular position of the machine as shewn on
the accompanying Drawing, nor to the exact mode of feeding and delivering, as
these details will vary with the materials under manipulation.
Having thus stated the nature of my Invention, and discribed the working of
the same,
I wish it to be understood, that I do not intend to limit myself to the
details given so long as the particular character of the Invention be retained, and I
claim, the improved mode of obtaining the movement of the dies, herein discribed,
by two eccentrics or cranks fixed on one main shaft at an angle with one another,
a little more or less than that shewn in the accompanying Drawing.
In witness whereof, I, the said Herbert Guthrie, have hereto set my hand and
seal, this Thirteenth day of June, Eighteen hundred and seventy-six.