Improvements in Presses for Pressing Sand Faced and other Brioks.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Presses for Pressing Sand Faced and other Brioks.
I, THOMAS CONSTANTINE FAWCETT, of T. C. Fawcett, Limited, of the White-
house Engineering Works, Hunslet Road, in the City of Leeds and County of
York, Engineers, do hereby declare the nature of this invention to be as follows:―
This invention has special reference to machines for pressing sand faced
bricks, but is equally applicable for pressing other descriptions of bricks whether
made by manual labor or by power.
The particular class of press to which my improvements are applicable, is
that description of machine having a top and bottom pressing plate moved up
and down by toggle jointed levers. To the bottom plate there are hinged four
collapsible sides which are opened and closed automatically for forming the four
outer sides of the brick.
When a brick is to be pressed it is placed upon the lower plate and the machine
set in motion, when the four collapsible sides in descending are closed against
the four sides of the bricks, by which means the said brick is pressed to its
proper, size and shape.
So far the apparatus described is common to this class of machine, but hitherto
the collapsible sides have descended into an opening in the machine and have
become ironbound, that is to say the outer metallic surfaces of the collapsible
plates have come into contact with other metallic surfaces, hence it has been
difficult for the collapsible box to be removed as the said box oftentimes become
locked and immovable.
The object of my invention is to prevent the locking of the moulding box
and this I accomplish by placing indiarubber or other yielding material between
the metallic parts so that when the brick is thoroughly pressed in the moulding
box, the indiarubber yields and permits the moulding box to be easily withdrawn.
The outer sides of the collapsible plates are inclined, working against opposing
inclined surfaces formed on a plate lying between the spring rubber and collap-
sible plates therefore as soon as the box commences to ascend the inclined surfaces
relieve the compressed rubber whereby its expands and continues to force the
collapsible plates against the sides of the brick whereby the corners or "adedges
of the bricks are made keen and sharp.
"
Instead of using indiarubber, for the purpose mentioned spiral or other form
of springs may be employed.
1000

page_text: Improvements in Presses for Pressing Sand Faced and other Bricks.
I, THOMAS CONSTANTINE FAWCETT, of T. C. Fawcett, Limited, of the White-
house Engineering Works, Hunslet Road, in the City of Leeds and County of
York, Engineers, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
This invention has special reference to machines for pressing sand faced bricks,
but it is equally applicable for pressing other descriptions of bricks whether made
by manual labour or by power. The particular class of press to which my im-
provements are applicable is that description of machine having a top and bottom
pressing plate moved up and down by toggle jointed levers or by screws. To the
bottom plate there are hinged four collapsible sides which are opened and closed
automatically for forming the four outer sides of the brick. When a brick is
to be pressed it is placed upon the lower plate and the machine set in motion,
when the four collapsible sides in descending with the lower plate are closed
against the four sides of the brick by which means the side brick is pressed to
its proper size and shape. So far the apparatus described is common to this class
of machine, but hitherto the collapsible sides have descended into an opening in
the machine, and have become iron-bound, that is to say the outer metallic sur-
faces of the collapsible plates have come into contact with other metallic sur-
faces, hence it has oftentimes been difficult to remove the collapsible box by
reason of its jamming or locking against the sides of the opening and remaining
immovable therein. The object of my invention is to prevent the locking or
jamming of the moulding box, and this I accomplish by placing india-rubber or
other yielding material between the metallic parts so that when the brick is
thoroughly pressed in the moulding box, the indiarubber yields and permits the
moulding box to be easily withdrawn. The outer sides of the collapsible plates
are inclined, and work against opposing inclined surfaces formed on a plate lying
between the spring rubber and collapsible plates, therefore as soon as the box
commences to ascend, the inclined surfaces relieve the compressed rubber whereby
it expands and continues to force the collapsible plates against the sides of the
brick whereby the corners or "arrises" of the bricks are made keen and sharp.
In the drawing hereunto attached, which is a cross section of the bottom pressing
plate and so much of the pressing table as is essential to illustrate my improve-
ments, letter a represents the pressing table; and 6 the bottom pressing plate
which has hinged to the upper side thereof four collapsible sides c working in
corresponding openings in the pressing plate b. The action of the machino
and parts described is precisely as heretofore and forms no part of my invention,
the essential features of which are the employment of wedge shaped plates d,
with corresponding inclined surfaces on the exteriors of the collapsible sides c,
and the insertion between said plates d and the sides of the opening a' of plates
or blocks e of indiarubber or like yielding material whereby the locking or
jamming of the parts through excess of pressure, which has hitherto taken place,
is avoided and the upward movement of the bottom pressing plate b together with
the pressed brick and collapsible mould, is facilitated. The gradual expansion
of the blocks or plates when the pressing plate b is being gradually raised tends to
keep the collapsible sides c in close contact with the pressed brick whereby the
corners or "arrises" of said brick are kept clean and sharp.
Instead of inserting blocks or plates of rubber or other yielding material
between the plates d and the sides of the opening a¹, spiral or other forms of
springs may be employed with similar effect.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
(1) In presses for pressing sand faced and other bricks the employment of
blocks or plates of indiarubber or suitable yielding material in the manner aud
for the purpose substantially as herein shewn and set forth.
(2) In presses for pressing sand faced and other bricks the combination with
the collapsible sides c, of wedge shaped or inclined surfaces on the exteriors
thereof, and corresponding wedge shaped or opposing inclined plates secured
within the opening in the pressure table in the manner and for the purposes
substantially as herein shewn and described.
Dated this Second day of October 1899
TASKER & CROSSLEY,
Patent Agents, Halifax, Agents for Applicant.