Improvements in Machines for Pressing Bricks.
Year: 1894

page_text: Date of Application, 14th June, 1894
Complete Specification Left, 12th Mar. 1895-Accepted, 13th Apr., 1895
PROVISIONAL SPECIFICATION.
Improvements in Machines for Pressing Bricks.
I, THOMAS CONSTANTINE FAWCETT, of the Whitehouse Engineering Works,
Hunslet, Leeds, in the County of York, Machine Maker and Engineer, do hereby
declare the nature of this invention to be as follows :-
:-
This invention relates to machines for pressing bricks, the object of my invention
being to prolong or to continue the pressure upon a brick even after the pressing
die has commenced to rise.
In carrying out my invention the bottom plate of the die is made to rise and fall
and on the underside of the die I employ a lever with its fulcrum underneath the
packing block situated under the bottom die, the opposite end of the said lever
being weighted for the purpose of causing the packing block and die to have an
upward tendency; therefore when the upper die has descended to its fullest extent
to press the brick and commences to return in its upward movement, the weighted
lever causes the bottom die to follow after it and thus the pressure upon the brick
is prolonged after the upper die has ceased to press upon the brick. When thick-
nessing a brick I make the lower die in two parts having a central piston to indent
the brick and when so employed the weighted lever only acts upon the central
piston and not upon the whole surface of the lower die. By this means bricks of
uniform thickness can be made in quick succession, and the power or force of the
pressure on the underside of the brick can be regulated by the weight put upon
the lever.
Dated this 12th day of June 1801
TASKER & CROSSLEY,
Halifax, Agents.
Improvements in Machines for Pressing Bricks.
I, THOMAS CONSTANTINE FAWCETT, of the Whitehouse Engineering Works,
Hunslet Leeds, in the County of York Machine Maker, and Engineer, 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
stateinent :-
This invention relates to machines for pressing bricks the object of my invention
being to prolong or to continue the pressure upon a brick even after the pressing
die has commenced to rise.
Such being the nature and object of my invention, I will now make reference to
the annexed sheet of drawings illustrative thereof, wherein Fig. 1 is cross section
of such parts of a machine for pressing bricks, as is necessary to illustrate my
improvements. A is the framework of the machine, and B the mould in which the
brick is pressed. The upper die C is moved up and down by toggle jointed
levers D and crank arm E as usual. The bottom plate of the moulding box or die
is shewn at F and it is raised up and down for the purpose of lifting the brick out
of the mould by means of lever G and vertical rod H operated by revolving cam I.
I Price 871

page_text: Underneath the bottom of the packing block F is a vertical bar or rod J the lower
end of which rests in a knuckle or recess formed in the lever K which is weighted
at the opposite end by weights L therefore when a brick has been pressed and the
upper die C commences to leave the top surface of the said brick, the packing
block F follows up with the brick through the effort of the weighted lever K,
consequently the pressure upon the top and bottom of the brick is prolonged, in
addition to which, the friction of the brick within the box causes the sides of it to
be smoothed or ironed. Immediately after the slight upward movement of the
brick by the weighted lever K in the manner just described, the lever G commences
to act for the purpose of lifting. the brick entirely out of the mould...
In order to make bricks of exactly one uniform thickness whether there may be
more or less clay put into the brick, I employ means for indenting the bottom of
the brick and which indent is capable of being made deeper or more shallow
according to the quantity of clay in the brick, and this I propose to effect whilst
maintaining the correct and uniform depth of each brick.
To accomplish my object I employ a piston M see Fig. 2. in the packing block
or die F. Under the bottom of this piston I employ a rod or bar J resting at the
foot of a weighted lever K which is always forcing the piston upwards to indent
the brick, and the quantity of clay in the brick determines the depth of the indent
as. the top die C has to overcome the upward thrust of the piston M. By this
meaus bricks of uniform thickness can be made notwithstanding varying quantities
of clay of which the brick is composed whilst the power or force of the pressure on
the underside of the brick can be regulated by the weight put upon the lever K.
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
Firstly. In brick pressing machines having a vertical pressing block, the com-
bination therewith of a weighted lever such as K operated in the manner and for.
purposes described.
Secondly. In a brick pressing machine having a vertical bottom pressing. .block,
the combination therewith of a piston M raised by a weighted lever Ki for
thicknessing bricks arranged as described and shewn in the drawings.
Dated this 11th day of March 1895.
TASKER & CROSSLEY,
Halifax, Patent Agents.