Improvements in Machinery for Making and Pressing Bricks.
Year: 1890

page_text: Date of Application, 20th Aug., 1890
Complete Specification Left, 19th May, 1891-Accepted, 20th June, 1891
PROVISIONAL SPECIFICATION.
Improvements in Machinery for Making and Pressing Bricks.
I, THOMAS CONSTANTINE FAWCETT, of Old Victoria Foundry, Manor Row,
Leeds, in the County of York, Machine Maker, do hereby declare the nature of this
invention to be as follows:-
In the moulds of brick making and brick pressing machines as at present
constructed, one or more openings or apertures are made for the purpose of permitting
superfluous clay to escape when the brick is being formed or pressed; but in
practice it is found that at that particular part of the brick from which the
superfluous clay has escaped, it is faulty or defective. The object of my invention
is to dispense with these openings for the escape of superfluous clay. For this
purpose the inner piston which forms the bottom of the brick is made to yield at a
proper and given time so that instead of the superfluous clay being passed off through
openings, it is compressed and solidified into the brick, and this is effected by the
inner piston yielding or giving way. The apparatus employ, for permitting the
inner piston to slightly lower in its box or casing, comprises a horizontal lever,
one end of which is made to act underneath the inner piston by means of a cam
acting upon a vertical rod attached to the other end of the said lever; a spiral or
other form of spring being placed around the rod and made to rest upon one end of
the horizontal lever, the action being such that when the press has reached its
lowest point of descent the pressure of the clay in the mould will cause the inner
piston to be slightly lowered, the spiral springs surrounding the vertical rod yielding
for that purpose, but when the brick is removed from its mould, the inner piston,
through the medium of the spring and rods, is made to assume its normal position
again.
The outer piston of the moulding box is made to move up and down in the ordinary
manner and independently of the inner piston; in like manner the inner piston
moves up and down independently of the outer piston.
Dated this 10th day of August 1890
TASKER & CROSSLEY,
Halifax, Agents.
COMPLETE SPECIFICATION.
Improvements in Machinery for Making and Pressing Bricks.
I, THOMAS CONSTANTINE FAWCETT, of Old Victoria Foundry, Manor Road,
Leeds, in the County of York, Machine Maker, 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:-
In the moulds of brick making and brick pressing machines as at present
constructed, one or more openings or apertures are made for the purpose of perimitting
superfluous clay to escape when the brick is being formed or pressed; but in
practice it is found that at that particular part of the brick from which the
superfluous clay has escaped, it is faulty or defective. One object of my invention
is to dispense with these openings for the escape of superfluous clay. For this
purpose the inner piston which forms the indent in the bottom of the brick is made
to yield at a proper and given time so that instead of the superfluous clay being
passed off through openings, it is compressed and solidified into the brick, and this
is effected by the inner piston yielding or giving way.

page_text: Such being the nature and object of my said invention, I will now proceed to
describe the same more fully, and for that purpose make reference to the annexed
sheets of drawings illustrative thereof, wherein Fig. 1 is sectional elevation of a
portion of a brick making and brick pressing machine having my improvements
applied thereto; and Fig. 2 is an enlarged section of the moulding box and bottom
pressing rammer. A represents the framework of the machine and B the brick
mould. C is the top pressing rammer operated by toggle jointed levers D connected
by rod E to a crank attached to the main shaft of the machine. In order to
dispense with openings or apertures in the moulding box for the escape of superfluous
clay, as is customary, I employ mechanism purposely designed for permitting the
superfluous clay to be put into the brick, and for this purpose I construct a
thicknessing motion or apparatus, consisting of an inner yielding piston G which
shapes or forms a portion of the bottom of the brick, the outer piston H shaping or
forming the outer portions of the bottom of the said brick. The bottom of the
inner yielding piston G rests upon one end of a lever I working on a fulcrum J,
the opposite end of such lever being provided with indiarubber, spiral or other
form of springs or cushions K, the tension of which is made adjustable by the lock-
nuts L on the rod M, therefore when the top pressing rammer C has reached the
extent of its downward stroke, and there is rather more clay in the mould than the
size of the brick is intended to be made, instead of such surplus clay escaping
through apertures, the inner piston yields through the medium of the springs K
whereby the superfluous clay is put into the brick, but as soon as the pressure
through the toggles D is removed from the brick, the inner piston G, through the
medium of the springs and rods, is made to assume its normal position again.
After a brick has been pressed, it is removed from the mould by the lever N,
which is operated by connecting rod O, actuated by any well known form of
mechanism, not shewn in the drawings.
Instead of the inner piston G being connected to the yielding lever I, it may
be connected to toggle jointed levers P (see Fig. 3) actuated by connecting
rod R from a cam or crank suitably placed; in this case the brick is squeezed
with great pressure on both of its sides, and as the pressure is thus divided, a
greater power can be brought to bear on the brick than is the case when all the
pressure is on the top of the brick, as is commonly the case; and the inner
piston G operated with toggle jointed levers P may be used whether the top
pressing rammer C is made with or without apertures for the escape of superfluous
clay.
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 a machine for making or pressing bricks, the combination therewith
of the yielding piston or pressing plate G, employed in the manner described
and for purposes set forth.
Secondly. In a machine for making and pressing bricks having toggle jointed
levers for operating the pressing rammer, the combination therewith of a yielding
piston or pressing plate arranged and employed in the manner substantially as
described and illustrated.
Thirdly. In a machine for making and pressing bricks, the combination there-
with of an inner pressing portion operated by toggle jointed levers as described
and shewn in Fig. 3.
Dated his work 1
1001
TASKER & CROSSLEY,
Halifax, Agents.