IMPROVEMENTS IN APPARATUS FOR PRESSING BRICKS AND FOR OTHER SIMILAR PURPOSES."
Year: 1878

page_text: LETTERS PATENT to Julius Frederick Moore Pollock, of Leeds, in the County
of York, Engineer, for the Invention of "IMPROVEMENTS IN APPARATUS FOR
PRESSING BRICKS AND FOR OTHER SIMILAR PURPOSES."
PROVISIONAL SPECIFICATION left by the said Julius Frederick Moore
Pollock at the Office of the Commissioners of Patents on the 17th May 1878.
JULIUS FREDERICK MOORE POLLOCK, of Leeds, in the County of York, Engineer.
"IMPROVEMENTS IN APPARATUS FOR PRESSING BRICKS AND FOR OTHER SIMILAR
PURPOSES."
23
This Invention has for its object the giving two distinct pressures successively in
the same mould. For this purpose I use, in conjunction with the mould and
pressing plate or surface, a "joggle or "elbow joint," and means for imparting
transverse motion thereto. The outer end of the one link is fixed, and that of the
other is suitably connected with the plate or surface by which pressure is given.
The transverse motion imparted to the middle joint causes the alternate approxi-
mation and divergence of the two outer end joints. The moveable pressing plate
or surface therefore approaches or recedes from the stationary end or joint of the
one link; thus, as is obvious, the point at which the greatest pressure is given out
is when the two links or joggles are in a straight line with each other. The
transverse motion given to the middle joint is such that at one extremity of the
stroke it raises the pressing plate or surface, so as to allow the pressed article,
supposing it to be a brick, to be lifted from the mould. At the other extremity
the pressing plate or surface is also raised, but only to a small extent.
It will be readily understood that the middle joint, in being traversed from one
extremity to the other and returning, passes the common centre line of the three
joints (ie, a straight line through said centres when the two links are in a common

page_text: straight line) twice, therefore twice giving out the extreme pressure in the direction
beyond the pressing plate or surface.
As is obvious machines may be constructed in various forms to operate on the
principle of my Invention, as above described.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said Julius Frederick Moore Pollock in the Great Seal Patent Office on the
2nd November 1878.
JULIUS FREDERICK MOORE POLLOCK, of Leeds, in the County of York, Engineer.
"IMPROVEMENTS IN APPARATUS FOR PRESSING BRICKS AND FOR OTHER SIMILAR
PURPOSES."
38
This Invention has for its object the giving two distinct pressures successively
in the same mould. For this purpose I use, in conjunction with the mould and
pressing plate or surface, a "joggle or "elbow joint," and means for imparting
transverse motion thereto. The outer end of the one link is fixed, and that of the
other is suitably connected with the plate or surface by which pressure is given.
The transverse motion imparted to the middle joint causes the alternate approxi-
-mation and divergence of the two outer end joints. The moveable pressing plate
or surface therefore approaches or recedes from the stationary end or joint of the
one link; thus, as is obvious, the point at which the greatest pressure is given out
is when the two links are in a straight line with each other. The transverse motion
given to the middle joint is such that at one extremity of the stroke it raises the
pressing plate or surface so as to allow the pressed article, supposing it to be a
brick, to be lifted from the mould. At the other extremity the pressing plate or
surface is also raised, but only to a small extent.
It will be readily understood that the middle joint in being traversed from one
extremity to the other and returning passes the common centre line of the three
joints (i.c., a straight line through said centres when the two links are in a common
straight line) twice, therefore twice giving out the extreme pressure in the direction
beyond the pressing plate or surface.
As is obvious, machines may be constructed in various forms to operate on the
principle of my Invention, as above described.
The accompanying Drawing represents in end view a brick-making machine
embodying my Invention.
a is the machine framework; b, the base plate; c, the lower portion of the press;
d, d, are the top and bottom press cross heads united by side rods d³, d³, as in my
well-known brick-making machines, and as described in my former Patent Speci-
fications, No. 2195 of 1800, and No. 2911 of 1869.
The side rod d² is extended upwards into a bush d³, which acts as a guide; each
side rod passes through a bush dª, such bushes acting as guides to the lower portions
of the side rods.

page_text: My arrangement for giving the reciprocating motion (in this case vertically) to
the press cross heads is composed of the following parts: is a shaft rotating in
the direction indicated by the arrow, and provided with a crank e¹ and crank
pine, which through a connecting rod fgives reciprocating motion to the crank
ann g attached to the rocking shaft g', the opposite end of the rocking shaft also
carrying the crank arm g. These arms therefore reciprocate together, moving in
the arcs indicated by the dotted lines, thus
; h is a link hinged on the
fixed point at its upper end, and hinged to a second link i at the point . This
second link is hinged to the top cross head d (or a small fixing connected with
the same) at the point 2x. To the point i', where the links hand i hinge together,
is also hinged or jointed a connecting rod or link j, the other end of which is jointed
to the crank arm g².
The Drawing represents the press cross heads in their highest position; as the
shaft e revolves the crank arm moves in the arc shewn by the dotted lines from
the point to the point g, drawing with it the connecting link j and the central
joint of the links h and i. The point boing fixed the point describes the arc,
shewn in dotted lines from 2 to 22, bringing the links and i into a straight line
and lowering the cross heads which come to their lowest point when the links are
in a straight line, and the central joint at the point passing this point to the end
of the are the cross heads are again somewhat raised and half a revolution of the
crank is completed. During the second half of the revolution the cross heads
again descend to their lowest point, and then rise to the highest, from which they
started.
23
The pressure is given out to the bricks (or other objects) in the mould & between
the top and bottom plates,, when the cross heads come to their lowest point,
and this pressure is therefore given out twice to each article, the article being
relieved between the pressures by the motions above described. When the two
pressures have been given the pressed articles are lifted out of the mould by the
bottom cross head d, which through the rods 1, 2, raises the bottom plates to
the level of the top of the mould (in which position they are shewn). When
arrived at the top of the mould the remainder of the upward stroke of the cross
heads is expended in compressing the spiral springs m, m³, thus giving timo for the
removal of the compressed articles while the bottom plate remains stationary in
its highest position.
Having described the nature of my said Invention, and explained the manner of
carrying it into practical effect, I would have it understood that what I consider to
be novel and original, and therefore claim as secured to me under the Letters
Patent first herein-before in part recited is,-
The method, substantially as herein-before described, of giving two distinct
pressures successively in the same mould by the use, in conjunction with the
mould and pressing plate or surface, of a joggle or elbow joint, and means for
imparting transverse motion thereto.
I also claim the improved apparatus constructed, arranged, and operating as
shewn in and described with reference to the accompanying Drawing, for pressing
bricks and for other similar purposes.
In witness whereof, I, the said Julius Frederick Moore Pollock, have here-
unto set my hand and seal, this First day of November, in the year of our
Lord One thousand eight hundred and seventy-eight.