Improvements in Pug Mills Employed in connection with Brick Making Machinery.
Year: 1896

page_text: Date of Application, 4th Mar., 1896
Complete Specification Left, 2nd Dec., 1896-Accepted, 6th Feb. 1897
PROVISIONAL SPECIFICATION.
Improvements in Pug Mills Employed in connection with Brick
Making Machinery.
We, THOMAS CONSTANTINE FAWCETT and T. C. FAWCETT, LIMITED, of
The Whitehouse Engineering Works, Leeds, in the County of York, Machine
Makers do hereby declare the nature of this invention to be as follows:-
This invention has reference to pug mills employed for forcing clay into the dies
of brick moulding cylinders. In some cases the screw of the pug mill is driven
intermittently but according to our construction of machine we propose to drive
the screw continuously and in order to reduce the strain between the end of the
screw and the revolving moulding box, we form an outlet port or aperture in the
upper part of the pug mill so that when clay has been forced into the moulding
bex and it is removed from the mouth of the pug mill presenting a blank surface
of the cylinder to the said mouth the pug mill shaft will force through the aperture
a quantity of clay equal to the size of a brick, whereby the pressure between the
end of the pug mill and the cylinder is lessened and power economised thereby,
also less wear and tear of the parts. As soon however as another moulding die is
presented to the mouth of the pug mill the aperture which receives the excess of
clay is closed by a rocking arm so that the force of the end of the screw is confined
to the clay which is being forced into the moulding box but as soon as that has
been effected the rocking arm opens the outlet port to permit another quantity
of clay to be pushed in for the purpose of relieving the pressure as already
described.
The surplus clay forced through the aperture falls back into the pug mill and
is used again. The rocking lever receives its motion by one or more cams which
are adjustable for the purpose of regulating the time for opening and closing
the port.
Dated this 3rd day of March 1806
TASKER & CROSSLEY,
Patent Agents,
Halifax, Agents for Applicants.
Improvements in Pug Mills Employed in connection with Brick
Making Machinery.
We, THOMAS CONSTANTINE FAWCETT, and T. C. FAWCETT, LIMITED, of
The Whitehouse Engineering Works, Leeds, in the County of York, Machine
Makers, 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 invention has reference to pug mills employed for forcing clay into the dies

page_text: of brick moulding cylinders. In some cases the screw of the pug mill is driven
intermittently but according to our construction of machine we propose to drive
the screw continuously and in order to reduce the strain between the end of the
screw and the revolving moulding box, we form an outlet port or aperture in the
upper part of the pug mill so that when clay has been forced into the moulding
box and it is removed from the mouth of the pug mill presenting a blank surface
of the cylinder to the said mouth, the pug mill shaft will force through the aperture
a quantity of clay equal to the size of a brick, whereby the pressure between the
-end of the pug mill and the cylinder is lessened and power economised thereby,
also less wear and tear of the parts.
The accompanying drawing illustrates a portion of a pug mill A, where B is a
revolving shaft carrying wipers C and a screw D which has a continuous rotary
motion imparted to it.
The wipers C mix the clay within the pug mill carrying it forward whilst the
screw D forces the clay into one or other of the brick mouiding boxes E formed
in the revolving cylinder or moulding box F, but when a blank surface G of the
moulding box comes opposite the month H of the pug mill, the pressure between
the end of the screw D and the blank surface G is relieved by the clay rushing up
or being forced through the aperture I the said clay finding its way in the
chamber J, but as soon however as an empty box E in the revolving cylinder F is
presented to the opening H the aperture I is closed through the action of the
cam K and lever arm L causing the lever M to rock upon its fulcrum N and thus
cover up the aperture I as will be readily seen and understood. The surplus clay
forced through the aperture I falls from the cylinder J back again into the pug
mill and is used again.
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:-
In a pug mill connected with brick making machinery the formation of an
aperture I closed and opened by a moving lever operated in the manner and for
purposes set forth herein.
Dated this 1st day of December 1896.
TASKER & CROSSLEY,
Halifax, Patent Agents.