Improvements in the Construction of Plastic and Stiff Plastic Brick Machines.
Year: 1899

page_text: Date of Application, 26th Apr., 1899
Complete Specification Left, 25th Jan., 1900-Accepted, 3rd Mar., 1900
DI MULTICATION.
Improvements in the Construction of Plastic and Stiff Plastic Brick
Machines.
I, FRANCIS JOHNSON, 18, Salisbury Grove, Armley, Leeds, in the County of
York, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to the class of brickmaking machines used for the pro-
duction of bricks by the plastic or stiff plastic process, whereby clay is fed into
a hopper or aperture and propelled forward to a die or moulding apparatus.
This is usually done by a suitable set of blades or other kind of propeller fixed
to or let on to a longitudinal shaft passing from the back to the front end of
the pugging barrel or cylinder wherein the clay is pugged or mixed. The clav
whilst being propelled forward has a tendency especially when of a soft and
sticky nature to adhere to the propeller or blades and revolve along with them
instead of being moved towards the die.
When this takes place it creates a great amount of radial friction on the inner
circumference of the pugging barrel and also a great strain on the driving
parts of the machine.
The object of my invention is to avoid the above faults by constructing the
barrel or pugging cylinder polygon shape instead of round. The cross section
of the barrel if taken in a plane at right angles to the direction of the pug
shaft would form in outline a polygon. The number of sides being made more
or less as required. If the shape was made that of a duedecagon the section of
the barrel would represent a form having twelve sides, which would offer a great
resistance to the clay being carried round with the shaft. On the other hand
there would only be the ordinary resistance offered to the clay moving forward
towards the die or moulding apparatus.
Dated this the 25th day of April 1899.
Improvements in the Construction of Plastic and Stiff Plastic Brick
Machines.
I, FRANCIS JOINSON, of 18, Salisbury Grove, Armley, Leeds, in the County of
York, 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 statement:-
-
This intantion nalator to improvements in the conctuuuation of the honnal

page_text: mouth piece of plastic and stiff plastic brick machines usually called pug mills.
The barrel of this machine is usually made of circular form in the cross section
and cylindrical or taper in the longitudinal section.
My invention consists in constructing the mouth piece of polygon form in
the cross section instead of circular, the object being to prevent the clay from
revolving along with the pug or propelling shaft which conveys the clay for-
ward to the brick die. The said shaft is provided with a number of blades
forming a kind of propeller and if the clay is of a plastic or sticky nature it
tends to adhere to the blades and shaft and revolve with them; and the clay
instead of being forced forward to the brick die, blocks the mouth piece up
and puts a great strain on the pug shaft besides reducing the output of bricks.
By constructing the mouth piece of polygon form having a suitable number
of sides sufficiently wide to hold the clay from revolving with the pug shaft it
enables the driving power to be more effective in propelling the clay to the
die, because whilst the sides prevent the clay from revolving they offer no
resistance to the forward movement of the clay towards the die. Thereby
increasing the output and removing undue torsional strain on the pug shaft.
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: -
First. The construction of a polygon shaped mouth piece appertaining to
plastic and stiff plastic brick making machines in order to prevent the clay or
other material from revolving with the pug shaft as herein described.
Dated this 24th day of January 1900.
FRANCIS JOHNSON,
Applicant.