IMPROVEMENTS IN BRICK MAKING MACHINERY
Year: 1878

page_text: LETTERS PATENT to Frederick Firth, Joseph Firth, and Edwin Firth, all of
Dewsbury, in the County of York, for the Invention of IMPROVEMENTS IN
BRICK MAKING MACHINERY."
"
Sealed the 12th July 1878, and dated the 3rd May 1878.
PROVISIONAL SPECIFICATION left by the said Frederick Firth, Joseph Firth,
and Edwin Firth at the Office of the Commissioners of Patents on the 3rd
May 1878.
FREDERICK FIRTH, JOSEPH FIRTH, and EDWIN FIRTH, all of Dewsbury, in the
County of York. "IMPROVEMENTS IN BRICK MAKING MACHINERY."
This Invention relates to improvements in machinery more especially for making
semi-plastic bricks, but the machinery is so constructed that bricks can be made by
it of any degree of plasticity, and if required the material can be manufactured in
the condition in which it leaves the clay mill.
The machinery embraces an improved pug mill, an improved mould table and
compressing apparatus, and an improved motion for rotating the mould table.
In the improved pug mill forming part of the apparatus we introduce an arrange-
ment by which the pug mill shaft is caused to remain stationary during the time
the mould table is in motion, so removing the pressure or friction of the clay upon
the table while the latter is in motion with an alternative provision, so that at
pleasure the revolution of the pug mill shaft may be made continuous when from
the nature of the clay or the wearing down of the knives carried by the pug mill
shaft more feed is required.
Another feature of the machine consists in having the ends of the mould table
open, so that the interior of the table may be accessible for examination, and the
removal of any clay which may find its way inside, and which might interfere with
the efficient working of the machine; also in the improved mould table; the mould
boxes are presented for filling by the pug mill, and for pressing in pairs, so securing
an increased production with the same, or less, strain on the pug mill as if one brick
[Price £dI

page_text: only were made at a time, and an adjustable cam is introduced by which the
feeding of the brick moulds by the pug mill can be regulated while the machine
is in motion.
The improvement in the compressing apparatus consists in applying a second
pressure to the bricks after the mould table has moved away from the point at
which the bricks receive their first pressure, so securing the complete expulsion of
air, and consequent freedom from air cracks in the bricks. This arrangement is also
an optional one in the using, as if it is found that from the nature of the clay one
pressure is sufficient, the second press can be disconnected at pleasure.
The improved means for rotating the mould table consists in affixing a disc
carrying the requisite number of pins and runners to the table, and in constructing
a circular flanged groove on the surface of the large spurwing, on portions of which
two cams are constructed, the first one of which moves the table about half the
distance required, and the second completes the moving of the table to the required
point for filling, pressing, and delivering the bricks; when this point has been
reached, one pin has been carried into the circular flanged groove through an
aperture in its outer flange, and another pin has been left fitting close to the outer
flange, the driving wheels continuing in motion; the one pin is kept steady by
being within the circular flanged groove; the other pin being close to the outer edge
of the flange acts as a perfect lock, so preventing the slightest motion of the mould
table, and consequent danger to the compressing apparatus, until it has done its
work and the cams have revolved to the proper position for imparting another
motion to the mould table. The operation of the cams being thus gradual and
steady, and the lock arrangement infallible, enables the machine to be run at a very
high speed without any danger of jerking or overrunning the distance which the
mould table is required to travel at each rotation; the edge of the disc, which is
affixed to the mould table, is toothed, imparting intermittent motion to another
toothed wheel carried by a shaft, upon which is fixed a small pulley underneath
the mould table. This pulley carries a strap, upon which the bricks are deposited
and carried away by the intermittent motion imparted by the disc affixed to the
mould table.
The carrying away of the bricks may be secured by other equivalent means. The
bricks are deposited by the filling of the opposite boxes pressing down the plates,
which are connected by rods or by an internal moveable lever, or other equivalent
means.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Frederick Firth, Joseph Firth, and Edwin Firth in the Great Seal
Patent Office on the 2nd November 1878.
FREDERICK FIRth, Joseph FirTH, and EDWIN FIRTH, all of Dewsbury, in the
County of York. "IMPROVEMENTS IN BRICK MAKING MACHINERY."
This Invention relates to improvements in machinery more especially for making
semi-plastic bricks, but the machinery is so constructed that bricks can be made by
it of any degree of plasticity, and if required the material can be manfactured in the
condition in which it leaves the clay mill.
The machinery embraces an improved pug mill, an improved mould table and
pressing apparatus, and an improved motion for rotating the mould table.
In the improved pug mill forming part of the apparatus we introduce an arrange-
ment by which the pug mill shaft is caused to remain stationary during the time
the mould table is in motion, so removing the pressure or friction of the clay upon
the table while the latter is in motion, with an alternative provision, so that at
pleasure the revolution of the pug mill shaft may be made continuous when, from
the nature of the clay or the wearing down of the knives carried by the pug mill
shaft, more feed is required.
Another feature of the machine consists in having the ends of the mould table
open, so that the interior of the table may be accessible for examination and the
removal of any clay which may find its way inside, and which might interfere with
the efficient working of the machine; also in the improved mould table; the mould
boxes are presented for filling by the pug mill, and for pressing in pairs, so securing
an increased production with the same (or less) strain on the pug mill as if one
brick only were made at a time, and an adjustable cam is introduced by which the
feeding of the brick moulds by the pug mill can be regulated while the machine is in.
motion.
The improvement in the compressing apparatns consists in applying a second
pressure to the bricks after the mould table has moved away from the point at
which the bricks receive their first pressure, so securing the complete expulsion of
air and consequent freedom from air cracks in the bricks. This arrangement is
also an optional one in the using, as if it is found that from the nature of the clay one
pressure is sufficient, the second press can be disconnected at pleasure.
The improved means for rotating the mould table consists in affixing a disc
carrying the requisite number of pins and runners to the table, and in constructing
a circular flanged groove on the surface of the large spur wheel, on portions of which
two cams are constructed, the first one of which moves the table about half the
distance required, and the second completes the moving of the table to the required
point for filling, pressing, and delivering the bricks; when this point has been
reached, one pin has been carried into the circular flanged groove through an
aperture in its outer flange, and another pin has been left fitting close to the outer
flange, the driving wheels continuing in motion. The one pin is kept steady by
being within the circular flanged groove; the other pin being close to the outer edge
of the flange acts as a perfect lock, so preventing the slightest motion of the mould
table, and consequent danger to the compressing apparatus, until it has done its
work, and the cams have revolved to the proper position for imparting another
motion to the mould table; the operation of the cams being thus gradual and steady,
and the lock arrangement infallible, enables the machine to be run at a very high
speed without any danger of jerking or overrunning the distance which the mould
table is required to travel at each rotation.
In order that our said Invention may be the better understood, we will proceed to,
describe the Drawings hereunto annexed.

page_text: Figure 1 represents a side elevation of the machine.
Figure 2 represents a section of the machine through the pug mill, compressing
apparatus, and mould table.
Figure 3 is a front elevation of the machine.
Figure 4 is a view of the driving wheels and arrangement for rotating the mould
table.
Similar letters indicate similar parts in all the Figures.
Between the framework a, a, we mount the mould table b horizontally, in which
we construct mould boxes in pairs, either parallel to or at right angles with the
axis of the mould table. For the purpose of illustrating this Invention they are
shown on the Drawings at right angles with the axis of the mould table.
In the interior of the mould table a sliding bar c is fixed in bearings d. This bar
supports the moveable bottoms of the mould boxes during the process of filling by
the pug mill, and can be adjusted by a screw in each end, so as to regulate the
quantity of clay supplied to the mould boxes.
The pug mille is fixed vertically above the mould table, and is driven by the
bevel wheels f. f', in conjunction with the propellor g and the pins h, h. The bevel
wheel runs loose round the pug mill shaft i, the propellor 9 being keyed on the
said shaft, and the pins h, h, fitting loosely in slots in the bevel wheel f
When the mould boxes are presented for filling, the bevel wheel (which revolves
continuously round the pug mill shaft) in its motion carries the pins h, h, against
the propellor g, which, being keyed on the pug mill shaft, causes the latter to revolve
far enough to fill the mould boxes, which for the time being are immediately under
the pug mill.
The pug mill shaft is provided with knives for the mixing and feeding of the
clay, as is well understood. The mould boxes being filled, the pins h, h, are pushed
upwards by the connecting rods and levers j, which are actuated at the proper time
by the pin and runner k on the inside of the spur wheel 8. This temporary dis-
placement of the pins h, h, permits the bevel wheel f to revolve a given distance,
viz, for half a revolution, without moving the pug mill shaft, and during the time
the latter is stationary the mould table is being moved, and this arrangement
prevents any friction of the clay upon the mould table while the latter is in
motion.
As soon as the bevel wheelf has revolved far enough for the pins h, h, to clear
the propellor g, the said pins drop back again into their original position, and are
ready to resume the operation of revolving the pug mill shaft as soon as they are
carried far enough by the revolution of the bevel wheelf to push once more against
the propellor g, and this operation is repeated as each pair of mould boxes is moved
and presented for filling by the pug mill.
Figure 5 shows the position of the parts at the moment the pins h are being
raised.
It will be seen that if the revolution of the pug mill shaft is at any time required
to be continuous, that object can be readily attained by disconnecting the rods and
levers j, which are used for the temporary displacement of the pins h, h. This
disconnection having taken place, and the pins h, h, being undisturbed, they
remain in contact with the propellor g, and so secure the continuous revolution of
the
pug mill shaft.
The press is actuated by the bell crank m on the shaft m, which receives its
motion from the spur wheel n and driving wheel o, which in their turn are driven
by the pair of wheels p, p.
The details of the press are shown in Figures 6, 7, 8, 9, and 10.
Figure 6 is a plan of press casting, looking from the top; Figure 7 is a side view

page_text: Figure 9 snows the end or press which goes into the moulds, also an end view of
slides in which the press works, and is carried with lock nuts, &c., for adjusting the
press.
Figure 10 is a side view of said slides, lock nuts, &c.
Figure 8 shows the way in which the press is moved backwards and forwards,
i.e., in and out of the moulds.
The same construction and mode of being carried and adjusted applies to both
presses.
m, m, and r, r, show the pressing shafts and bell cranks on same.
When the bricks are being pressed the bell crank, as it comes round towards the
mould table, pushes the casting 1 (which occupies the space marked 2 on Figure 6)
against the press 3, and so effects the pressure of the bricks, the bell crank in its
revolution then recedes from the mould table, and pushes the casting 4 against the
point 5 of the press casting, and so moves the press far enough away from the mould
table for the latter to move away to the point required for the pressure of the next
pair of bricks.
6, 6, 6, 6, are flanges cast on the framework a; 7, 7, are the slides which carry
the press, and in which the guides 8, 8, 8, 8, work.
The second press q is actuated by the bell crank on the shaft r, which receives its
motion from the pair of wheels 8, 8', which are driven by the wheel n, the wheel s being
keyed on the opposite end of the same shaft m as is the wheel n. This press can be
readily disconnected if it is found that one press is sufficient.
In the motion for rotating the table, Figure 4 shows it at the moment when it
has just carried the pin t into the circular-flanged groove u through the aperture v
in the outer flange, and the pin w has been left fitting close to the outer flange, the
spur wheel n continuing in motion in the direction of the arrow
→ the
table remains stationary for filling, pressing, and depositing the bricks during
the time the circular-flanged groove is revolving round the pins t and w, and
until the cam has reached the point y, where it begins to rotate the mould table
by pushing against the pin w, which has previously been left fitting close to the
outer flange, by this means moving the table about half the requisite distance. By
this time the cam z has got hold of the next pin t, and by pushing against it
completes the distance to the point required for filling, pressing, and delivering the
bricks, and by this means leaves the pin t, against which it has been pushing,
fitting close to the outer flange in the position previously occupied by the pin w,
and carrying the next pin into the circular-flanged groove through the aperture v
in the outer flange, this operation being repeated over and over again for each pair
of bricks.
It will be seen that it is impossible for the table to move in the least during the
period it should remain stationary. The pin t fitting close to the inside of the
flange, and the pin w fitting close to the outside of the outer flange, acts as a perfect
lock, which is not released until the next pair of bricks have been filled, pressed
and deposited.
The bricks are pushed out and deposited by the action of the sliding bar a'
working in the bearings d, the said sliding bar being worked by the levers, con-
necting rod, and pin b. As the bricks are deposited they are pushed away by the
action of the levers c¹ on the shaft d, which in their turn are actuated by the
flanged cam e¹ keyed on the shaft r, or the bricks may be carried away by a
travelling strap.
The machine is driven by a belt from the main shaft to the pulleys ƒ³
In some cases, for the sake of cheapness and simplicity, we construct machines
without the second press, and the arrangements by which the intermittent action
of the pug mill is obtained by retaining the mechanism for turning the table and
the same general arrangement of the machine.
Having thus described the nature of our said Invention, and the manner of per-
forming the same, we would have it understood that we claim,-
First. The pug mill having an intermittent motion transmitted to it, so that it

page_text: operates whilst the moulds are in place, and remains stationary whilst the moulds
are in movement, substantially as described.
Second. The mechanism by which intermittent motion is given to the pug mill,
substantially as described.
Third. The combination of the cylindrical mould table and two presses giving
two separate pressures to the bricks, substantially as described.
Fourth. The mechanism for rotating the mould table, substantially as described.
Fifth. The general arrangement of brick-making machinery, substantially as
described.
In witness whereof, I, the said Frederick Firth, have hereunto set my hand
and seal, this Twenty-ninth day of October, in the year of our Lord
One thousand eight hundred and seventy-eight.
FREDERICK. FIRTH, (L.S.)

page_text: date the 3rd day of May 1870, No. 1791,
DISCLAIMER AND MEMORANDUM OF ALTERATION proposed to be entered
by the said Frederick Firth, Joseph Firth, and Edwin Firth, as such Patentees
as aforesaid, pursuant to the Statutes in that case made and provided.
"
WHEREAS since filing the Specification to the said Letters Patent for
Improvements in Brick Making Machinery" we have been informed that the
giving an intermittent motion to the pug-mill, so that it shall operate whilst the
moulds are in place, and remain stationary whilst the moulds are in movement, was
not new at the date of our Patent: And whereas we have also found that it is
unnecessary to give such intermittent motion to the pug-mill: And whereas we do
not wish to retain the claims made in respect of such intermitting motion or of
the manner of obtaining it:
We therefore for these reasons wish to disclaim and alter our said Specification,
and we do hereby disclaim and alter the same by striking out the words "an
improved" on line 10, page 3 of the Specification as it is printed by Her Majesty's
Printers, and by inserting in place thereof the word "a."
Also by striking out the paragraph commencing with the words "in the improved
pug mill" at line 12, page 3, and ending with the words "more feed is required,"
at line 18, page 3.
Also by striking out the word "another" on line 19, page 3, and inserting in
place of it the word " one."
Also by striking out the claiming clause commencing with the words "First. The
pugmill" on line 57, page 5, and ending with the words "substantially as described "
on line 2, page 6.

page_text: Also by striking out the claiming clanse commencing with the words "Second.
The mechanism" on line 3, page 6, and ending with the words " substantially as
described" on line 4, page 6.
"
"
Also by striking out the word " Third on line 5, page 6, and inserting the word
First" in place of it.
Also by striking out the word "Fourth" on line 7, page 6, and inserting the
word "Second" in place of it.
Also by striking out the word "Fifth " on line 8, page 6, and inserting the word
Third" in place of it.
The portion of the Specification describing the Drawings we leave unaltered, 80
that the working of the machine shewn in the Drawings may be properly under-
stood.
And in order that the effect of this Disclaimer and Memorandum of Alteration
may be fully understood we annex a copy of the Specification as it will appear
when such Disclaimer and Memorandum of Alteration has been made as afore-
said.
"
s
"
"
" TO ALL TO WHOM THESE PRESENTS SHALL COME, we, FREDERICK
FIRTH, JOSEPH FIRTH, and EDWIN FIRTH, all of Dewsbury, in the County of
York, send greeting.
"WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
"Patent bearing date the Third day of May, in the year of our Lord One thousand
"eight hundred and seventy eight, in the forty first year of Her reign, did for
"Herself, Her heirs and successors, give and grant unto us, the said Frederick
Firth, Joseph Firth, and Edwin Firth, Her special license, that we, the said
"Frederick Firth, Joseph Firth, and Edwin Firth, our executors, administrators,
" and assigns, or such others as we, the said Frederick Firth, Joseph Firth, and
"Edwin Firth, our executors, administrators, and assigns, should at any time
agree with and no others, from time to time and at all times thereafter during
"the term therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN BRICK MAKING
" MACHINERY," upon the condition (amongst others) that we, the said Frederick
Firth, Joseph Firth, and Edwin Firth, our executors or administrators, by an
instrument in writing under our or their hands and seals, or under the hand and
"seal of one of us or them, should particularly describe and ascertain the nature
of the said Invention, and in what manner the same was to be performed, and
cause the same to be filed in the Great Seal Patent Office within six calendar
"months next and immediately after the date of the said Letters Patent.
"
"
"
"
65
"
"
"NOW KNOW YE, that I, the said Frederick Firth, on behalf of myself and
"the said Joseph Firth and Edwin Firth, do hereby declare the nature of the said
Invention, and in what manner the same is to be performed, to be particularly
"described and ascertained in and by the following statement thereof, that is
" to say -
<<
<<
This Invention relates to improvements in machinery, more especially for
making semi plastic bricks, but the machinery is so constructed that bricks can
" be made by it of any degree of plasticity, and if required the material can be
"manufactured in the condition in which it leaves the clay mill.
"
"The machinery embraces a pug mill, an improved mould table and pressing
apparatus, and an improved motion for rotating the mould table.
"One feature of the machine consists in having the ends of the mould table open
so that the interior of the table may be accessible for examination and the
"removal of any clay which may find its way inside and which might interfere
" with the efficient working of the machine; also in the improved mould table the
"mould boxes are presented for filling by the pugmill and for pressing in pairs, so
securing an increased production with the same (or less) strain on the pugmill as
if one brick only were made at a time, and an adjustable cam is introduced by
"

page_text: which the feeding of me brick moulds by the pug can be regulated whe
"the machine is in motion.
"The improvements in the compressing apparatus consists in applying a second
pressure to the bricks after the mould table has moved away from the point at
"which the bricks receive their first pressure, so securing the complete expulsion
"of air and consequent freedom from air cracks in the bricks. This arrange-
"ment is also an optional one in the using, as if it is found from the nature
"of the clay one pressure is sufficient the second press can be disconnected at
"pleasure.
t
that
"The improved means for rotating the mould table consists in affixing a disc
carrying the requisite number of pins and runners to the table, and in con-
structing a circular flanged groove on the surface of the large spur wheel, on
portions of which two cams are constructed, the first one of which moves the
"table about half the distance required, and the second completes the moving of
"the table to the required point for filling, pressing, and delivering the bricks;
"when this point has been reached one pin has been carried into the circular
"flanged groove through an aperture in its outer flange, and another pin has been
left fitting close to the outer flange, the driving wheels continuing in motion.
"The one pin is kept steady by being within the circular flanged groove; the other
pin being close to the outer edge of the flange acts as a perfect lock, so preventing
"the slightest motion of the mould table, and consequent danger to the compressing
apparatus, until it has done its work and the cams have revolved to the proper
"position for imparting another motion to the mould table; the operation of the
cams being thus gradual and steady, and the lock arrangement infallible, enables
"the machine to be run at a very high speed without any danger of jerking or
overrunning the distance which the mould table is required to travel at each
"rotation.
<
"
C
44
"In order that our said Invention may be the better understood we will proceed
"to describe the Drawings hereunto annexed.
"DESCRIPTION OF DRAWINGS.
"Figure 1 represents a side elevation of the machine.
*
Figure 2 represents a section of the machine through the pug mill, compressing
ke apparatus, and mould table.
"Figure 3 is a front elevation of the machine.
"
Figure 4 is a view of the driving wheels and arrangement for rotating the
"mould table.
"
"Similar letters indicate similar parts in all the Figures.
" Between the framework a, a, we mount the mould table 6 horizontally, in which
we construct mould boxes in pairs either parallel to or at right angles with the
"axis of the mould table. For the purpose of illustrating this Invention they are
angles
"shewn on the Drawings at right with the axis of the mould table.
A
" In the interior of the mould table a sliding bar c is fixed in bearings d. This
"bar supports the moveable bottoms of the mould boxes during the process of filling
"by the pug mill, and can be adjusted by a screw in each end so as to regulate the
quantity of clay supplied to the mould boxes.
tho
A
.
"The pug mill e is fixed vertically above the mould table, and is driven by the
"bevel wheels f, f¹, in conjunction with the propellor g and pius h, h. The
"bevel wheel f runs loose round the pug mill shaft i, the propellor g being keyed on
"the said shaft, and the pins h, h, fitting loosely in slots in the bevel wheel f.
"When the mould boxes are presented for filling the bevel wheel f (which
"revolves continuously round the pug mill shaft) in its motion carries the pins h, h,
against the propellor g, which being keyed on the pug mill A causes the latter
to revolve far enough to fill the mould boxes which for the time being are
immediately under the pug mill,
shaft

page_text: "
"
This
"The pug mill shaft is provided with knives for the mixing and feeding of the
"clay as is well understood. The mould boxes being filled the pins h, h, are
pushed upwards by the connecting rods and levers j, which are actuated at tho
proper time by the pin and runner k on the inside of the spur wheel 8.
"temporary displacement of the pins h, h, permits the bevel wheel f to revolve a
given distance, viz., for half a revolution without moving the pug mill shaft,
"and during the time the latter is stationary the mould table is being moved, and
"this arrangement prevents any friction of the clay upon the mould table while
"the latter is in motion.
<<
"
." As soon as the bevel wheel ƒ has revolved far enough for the pins h, h, to clear
"the propellor g the said pins drop back again into their original position, and are
ready to resume the operation of revolving the pug mill shaft as soon as they
are carried far enough by the revolution of the bevil wheel f to push once more
against the propellor g, and this operation is repeated as each pair of mould
"boxes is moved and presented for filling by the pug mill.
«
"E
Figure 5 shows the position of the parts at the moment the pins h are being
" raised.
"
" It will be seen that if the revolution of the pug mill shaft is at any time
required to be continuous that object can be readily attained by disconnecting
"the rods and levers j, which are used for the temporary displacement of the
pins h, h. This disconnection having taken place and the pins h, h, being undis-
"turbed, they remain in contact with the propellor g, and so secure the continuous
"revolution of the pug mill shaft.
**
"The press is actuated by the bell crank m on the shaft m, which receives its
"motion from the spur wheel n and driving wheel o, which in their turn are
" driven by the pair of wheels p, p.
"The details of the press are shewn in Figures 6, 7, 8, 9, and 10.
"
Figure 6 is a plan of press casting, looking from the top; Figure 7 is a side
"view of same.
"
Figure 9 shews the end of press which goes into the moulds, also an end
"view of slides in which the press works, and is carried with lock nuts, &c., for
adjusting the press.
"
"
Figure 10 is a side view of said slides, lock nuts, &c.
"Figure 8 shews the way in which the press is moved backwards and forwards,
"i.e., in and out of the moulds.
"
"
"The same construction and mode of being carried and adjusted applies to both
presses.
"
m, m, and r, r, show the pressing shafts and bell cranks on same.
"When the bricks are being pressed the bell crank as it comes round towards
"the mould table pushes the casting 1 (which occupies the space marked 2 on
Figure 6) against the press 3, and so effects the pressure of the bricks, the bell
"crank in its revolution then recedes from the mould table and pushes the casting 4
against the point 5 of the press casting, and so moves the press far enough away
"from the mould table for the latter to move away to the point required for the
pressure of the next pair of bricks.
"
$4
«
6, 6, 6, 6, are flanges cast on the framework a; 7, 7, are the slides which carry
"the press, and in which the guides 8, 8, 8, 8, work.
"The second press q is actuated by the bell crank r on the shaft r, which
"receives its motion from the pair of wheels 8, 8¹, which are drawn by the wheel n,
" the wheel 8 being keyed on the opposite end of the same shaft m as is the
" wheel n.
This press can be readily disconnected if it is found that one press is
" Bufficient.
86
" In the motion for rotating the table, Figure 4 shows it at the moment when
"it has just carried the pin t into the circular-flanged groove u through the
aperture v in the outer flange, and the pin w has been left fitting close to the
"outer flange, the spur wheel n continuing in motion in the direction of the
$i arrow →, the table remains stationary for filling, pressing, and depositing

page_text: "the bricks during the time the circular-flanged groove is revolving round the
pins t and w, and until the cam x has reached the point y where it begins to
"rotate the mould table by pushing against the pin w which has previously been
" left fitting close to the outer flange, by this means moving the table about half
"the requisite distance. By this time the cam z has got hold of the next pin t,
" and by pushing against it completes the distance to the point required for filling,
pressing, and delivering the bricks, and by this means leaves the pint against
" which it has been pushing, fitting close to the outer flange in the position
"previously occupied by the pin w, and carrying the next pin into the circular
"flanged groove through the aperture v in the outer flange, this operation being
"repeated over and over again for each pair of bricks.
"It will be seen that it is impossible for the table to move in the least during
"the period it should remain stationary. The pin t fitting close to the inside of
"the flange, and the pin w fitting close to the outside of the outer flange, acts as a
perfect lock, which is not released until the next pair of bricks have been filled,
pressed, and deposited.
«
"The bricks are pushed out and deposited by the action of the sliding bar a¹
working in the bearings d, the said sliding bar being worked by the levers,
connecting rod, and pin b¹. As the bricks are deposited they are pushed away
"by the action of the levers c¹ on the shaft d', which in their turn are actuated
by the flauged cam el keyed on the shaft r, or the bricks may be carried away by
a travelling strap.
"The machine is driven by a belt from the main shaft to the pulleys f².
"In some cases, for the sake of cheapness and simplicity, we construct machines
" without the second press, and the arrangements by which the intermittent action
" of the pug mill is obtained, but retaining the mechanism for turning the table
"and the same general arrangement of the machine.
Having thus described the nature of our said Invention and the manner of
performing the same, we would have it understood that we claim,—
First. The combination of the cylindrical mould table and two presses giving
"two separate pressures to the bricks, substantially as described.
"Second. The mechanism for rotating the mould table, substantially as
described.
"Third. The general arrangement of brick making machinery, substantially as
described."
In witness whereof, we, said Frederick Firth, Joseph Firth, and Edwin Firth,
have hereunto set our hands and seals, this Thirtieth day of September, in
the year of our Lord One thousand eight hundred and seventy-nine.
I hereby grant my fiat, giving leave to the above-named Frederick Firth, Joseph
Firth, and Edwin Firth, to file in the Great Seal Patent Office, with the Specification
5 to which the same relates, the above-written Disclaimer and Memorandum of
Alteration.