Improvements in Machines for Moulding and Pressing Bricks.
Year: 1889

page_text: Date of Application, 7th Feb., 1889
Comvicte Succnication
למדי לחוד מוופי
June
COO
7037
1000
Accepted, 27th July, 2000
CUIDIGLC DUGGINtation LG SUL
PROVISIONAL SPECIFICATION.
Improvements in Machines for Moulding and Pressing Bricks.
We JOHN CRAVEN and BENJAMIN CRAVEN of Wakefield in tho County of York
Engineers do hereby declare the nature of our said Invention to be as follows :-
Our Invention relates to that description of machine for moulding and pressing
bricks in which the moulds are arranged in a table to which an intermittent partial
rotation is imparted by means of a tappet wheel or equivalent device so as to bring
the moulds in succession beneath the outlet of a pug mill from which each mould
receives a charge of clay to form a brick which clay is forced into the moulds and
afterwards expelled therefrom by a lever operated by the tappet wheel or otherwise
and pushed from the table on to the press by which the moulded bricks are finally
compressed ready for the kiln. It has been found in practice that in consequence of
the pressure from the pug mill being exerted on the tops of the moulded bricks
more than on the bottom surface thereof the top surface is much more consolidated
than the lower or bottom surface of the brick and that therefore they are not so
efficiently compressed as desirable.
Our Invention has for its object to provide means whereby the above defect is
obviated and consists in interposing between the moulding mechanism and the press
an arrangement whereby the moulded bricks after leaving the moulds and before
they enter the press are reversed in position that is to say the surface of the brick
which when leaving the mould was lowermost is turned uppermost.
A convenient arrangement for carrying out our Invention consists in providing
between the rotating mould table and the press a standard or support in which is
fitted to rotate a box cage or receptacle into which the bricks as they are expelled
from the moulds are pushed by a driver or propellor operated at the requisite periods
from the driving shaft of the moulding machine or by other suitable means.
The box cage or receptacle is preferably rotated by means of gearing from the
rotating mould table, the said gearing being so timed as to impart to the box cage
or receptacle a half revolution at each partial rotation of the table whereby the bricks
which had been forced into the cage or box by the pusher while the mould table
was remaining stationary will be turned upside down so that when the next moulded
brick is pushed from the mould table into the cage or box, the reversed brick will
be forced from the said cage or box onto the table of the press in position to receive
the pressure thereof upon the reverse side to that which received the direct pressure
from the pugmill.
The Invention is equally applicable to single and double moulding machines such
as those known as Cravens Brick machines that is to say the box or cage may be made
with a single chamber only to receive a moulded brick at each half revolution, or it
may be made with two compartments to receive at each half revolution a brick in
each compartment.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in Machines for Moulding and Pressing Bricks.
We JOHN CRAVEN and BENJAMIN CRAVEN both of Wakefield in the 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 :-
Our Invention relates more particularly to that description of machine for

page_text: moulding and pressing bricks in which the moulds for the bricks are arranged in a
table to which a partial rotation is intermittently imparted by means of a tappet whical
or equivalent device so as to bring the moulds in succession beneath the outlet of a
pug mill where the table is caused to remain stationary while the clay is being forced
from the pug mill into the mould or moulds situated beneath the said outlot, each
of the said moulds receiving a charge of clay to form a brick and the moulded
bricks being expelled from the moulds, so as to bring their lower surfaces loval with
the top surface of the mould table, by means of a lover operated by projections on
the tappet wheel which rotates the mould table, the bricks being then pushed from
the inble on to the press by which they are finally compressed ready for the kiln.
It has buen found in practice that in consequence of the pressure on the clay forced
into the moulds boing exerted on the top, while the bottom receives only the
resisting pressure of the bottom of the mould, the upper portion of the moulded
brick is much more consolidated than is the lower or bottom portion, and that
therefore the bricks are not so efficiently compressed as is desirable.
Our Invention has for its object to provide means whereby the above defect is
obviated by turning the moulded brick so as to present the underside thereof to the
direct pressure of the finishing pre-s.
According to our Invention we interpose between the moulding mechanism and the
pre- which imparts the final pressure to the bricks an arrangement consisting of a
rotating box receptacle or cage into which the moulded bricks after leaving the
moulare pushed, and by which their position is altered before they enter the press,
that is to say the surface of the brick which was lowermost when leaving the mould
is turned before it enters the press so that the said lowermost surface is presented to
the direct action of the press.
A convenient arrangement for carrying out our Invention is illustrated in the
accompanying drawings Figure 1 of which is n side elevation and Figure 2 a plan of
so much of a brick making machine as is necessary to illustrate our present Inven-
tion, the details of the pressing mechanism and other parts common to these machines
bring omitted. Figure 3 is a front elevation of the reversing mechanism constructed
necording to our Invention. A is the mould table provided with a number of recesses
or moulds a each of which is brought successively beneath the pug mill B to receive
therefrom a charge of clay to form a brick. This mould table receives an intermittent
partial rotation by means of a tappet wheel driven by suitable gear from the main
shatt of the machine, the tappets on the said whool being so arranged as i bring
one or more of the moulds beneath the pug mill and then allow the mould table to
remain stationary while the said mould or moulds is or are being charged with clay,
and then to move forward to bring the next mould or moulds into position to bo
charged with clay. The moulds a are provided with movable bottoms which while
the table is stationary are acted upon by a lover operated at the requisito periods by
the tappet whool U so as to eject the moulded bricks from the moulds to a lovel with
the top surface of the mould table. Between the mould table A and the pross D is
provided a standard or support in which is fitted to rotate a box cage or receptacle F
into which the bricks, after they are expelled from the moulds, are pushed by a
driver or propeller G oporated at the requisito periods from the driving shaft H of
the moulding machine by means of an excentric I and lover K or by other suitable
means. The box cage or receptacle with the moulded brick or bricks therein is
thon partially rotated so as to turn the brick or bricks upside down. This box cage
or receptacle may be operated by any suitable means but it is preferably rotated
by means of gearing from the mould tablo A. for which purpose the said table is
provided on its underside with a bovel wheel L gearing into a pinion M fast on one
end of a shaft N mounted in a boss or bearing O in the standard or support and
carrying at its opposite end a spur wheel gearing with another spur wheel Q
mounted on a stud R in the standard E. The wheel gears with a wheel S fast on
the box, cugo or receptacle F the gearing M. P Q S being so timed that the
receptacle receives half a revolution at each partial rotation of the mould tablo A.
whereby the brick or bricks which had been forced into the cage or box by the

page_text: pusher while the mould table was remaining stationary will be turned upside down
so that when the next moulded brick or bricks is or are pushed from the mould table
into the cage or box F the reversed brick or bricks will be forced from the said
cage or box onto the table of the press and will by the succeeding bricks expelled
from the said cage or box be pushed into position to receive the direct pressure from
the plunger of the press D upon the reverse side to that which received the direct
pressure from the pug mill." The entrance mouth or mouths of the chamber or
chambers in the rotating box or cage F is or are preferably splayed so as to guide the
moulded bricks thereinto.
The invention is applicable to either single or double moulding machines such for
example as those known as Cravens brick machines that is to say the box or cage
may be made with one chamber only to receive a single moulded brick at each half
revolution or it may be made with two chambers as shewn in the drawings to receive
at each half revolution a brick in each chamber.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed, we declare that what
we claim is :-
1st. In or connected with machines for moulding and pressing bricks means
whereby the bricks after being moulded and before they receive the final pressure in
a finishing press are turned over or reversed before they come under the action of
the plunger of the finishing press substantially as herein before described.
2nd. In or connected with machines for moulding and pressing bricks a rotating
box receptacle or cage into which the moulded bricks are pushed from the moulding
table the said box receptacle or cage with the moulded brick or bricks therein being
then turned so as to bring the lower side of the brick or bricks into position to be
acted upon by the direct action of the plunger of the finishing press substantially as
hereinbefore described with reference to the accompanying drawings.
3rd. In or connected with machines for moulding and pressing bricks a rotating
box receptacle or cage by which the moulded bricks are reversed in position before
they enter the finishing press the said rotating box receptacle or cage being operated
by gearing from the mould table or other moving part of the brick machine
substantially as herein before described with reference to the accompanying drawings.
4th. The combination with machinery for moulding and pressing bricks of the
parts lettered L, M, P, Q, S and F constituting apparatus for turning the moulded
bricks before they enter the finishing press substantially as hereinbefore described and
illustrated by the accompanying drawings.
Dated this 25th day of June 1900