Improvements in the Metal Pot Mechanism of Casting Machines, especially in that of Linotype Machines.
Year: 1898

page_text: Date of Application, 19th May, 1898
Complete Specification Left, 18th Feb., 1899-Accepted, 19th May, 1899
PROVISIONAL SPECIFICATION.
Improvements in the Metal Pot Mechanism of Casting Machines,
especially in that of Linotype Machines.
We, WILLIAM HENRY LOCK, Manager and Secretary of The Linotype Company,
Limited, of No. 188, Fleet Street, in the City of London, BERNE NADALL, of
No. 6118, Princeton Avenue, Englewood, Chicago, in the State of Illinois,
U.S.A., at present residing at No. 19, Stockport Road, Altrincham, in the County
of Chester, Designer, and MARK BARR, of The Linotype Works, Broadheath, in
the same County, Electrician, do hereby declare the nature of this invention
to be as follows;-
Our invention relates to improvements in the metal pot mechanism of casting
machines in which the actuating agent for the injection of metal into the mould, is
a body of compressed air instead of a piston. It is especially applicable to the
casting mechanism of linotype machines. In carrying it into effect, there is
arranged above or near the metal-pot pump-cylinder, a tank which is kept full
of air compressed to the requisite degree by any suitable means, and is fitted
with a blow-off valve adapted to prevent the pressure within rising above a given
degree. The top of the metal pot is open to the air, whilst that of the said
cylinder is closed air-tight and is connected with the tank just described by a
suitable pipe. There is a cock in that pipe adapted to control it and to establish
a connection between the part of it on the metal-pot pump-cylinder side of it
and the open air.
The path of the metal from the pump-cylinder to the mould is through a
throat and port. The former starts from the bottom of the cylinder above
mentioned and rises up the side of the metal pot. It is closed across its top.
The said port extends from the top of the throat to the nozzle of the metal pot.
It is preferably conical in shape, its diameter diminishing in the direction of the
said nozzle. It is controlled by a correspondingly shaped spindle adapted to
work to and fro in a suitable guide. There is combined with the said port and
spindle, a second port situated on the rear side of the throat and axially coincident
with the conical one, and a valve on the said spindle adapted to control the said
second part. When one of them is closed, the other one is open. The spindle is
connected to a suitable gear adapted to open one port and to close the other at
the proper times.
The cock on the air pipe above described is also treated in an analogous way,
both mechanisms being worked automatically by the machine.
The level of the metal in the pot is constant, more or less, but it is always
above that of the nozzle and ports above mentioned.
The operation of the invention is as follows.
At the proper moment for the injection of metal through the nozzle, the
cock is turned so as to establish a connection between the air tank and the pump
cylinder, the conical port opened and the one opposite to it, closed. At the end
of the injection, the conical port is closed and the second one is opened. At the

page_text: same moment the cock above mentioned is closed to the passage of air from the
tank to the pump cylinder and opened from the pump cylinder to the outer air,
so that metal in the metal pot around the pump cylinder shall flow through the
second port above mentioned into the throat of the metal pot, thereby re-establish-
ing the normal level of the metal in the pump cylinder.
Dated this 10th l
1000
Improvements in the Metal Pot Mechanism of Casting Machines,
especially in that of Linotype Machines.
We, WILLIAM HENRY LOCK, Manager and Secretary of The Linotype Company,
Limited, of No. 188, Fleet Street, in the City of London, BERNE NADALL, of
No. 6118, Princeton Avenue, Englewood, Chicago, in the State of Illinois,
U.S.A., at present residing at No. 19, Stockport Road, Altrincham, in the County
of Chester, Designer, and MARK BARR, of The Linotype Works, Broadheath, in
the same County, Electrician, 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:-
The present invention relates to improvements in the metal pot mechanism
of casting machines in which the injection of the metal is effected by a body of
compressed air instead of by a solid piston, and it is especially applicable to the
casting mechanism of linotype machines. It consists in a cock controlling the
access of air pressure to the pump cylinder and the exhaust from it, two valves
or a cock controlling the port to the delivery nozzle through which the metal
passes into the mould, a port between the main body of the metal in the metal
pot and a throat or chamber between the pump cylinder and the port to the
mould, together with means for working the said cock and two valves or one cock
synchronously, to the end that when the pump cylinder is open to the air pressure,
the exhaust from it shall be closed, the port to the delivery nozzle be open and
the port from the main body of metal to the intermediate throat or chamber,
be closed; and vice versa.
The last mentioned port is an important part of the invention inasmuch as it
provides for the throat or chamber being kept full of metal up to the port which
is in direct communication with the delivery nozzle.
metal rising in the pump cylinder to the level of that in the metal pot.
It also provides for the
Referring to Figure 1, V is a chamber kept charged by any suitable means,
with air through a supply pipe V9. The air is maintained at a suitable pressure
in that chamber, any increase beyond the desired degree being prevented by a
safety valve V70 V is a delivery pipe leading from the air chamber V8 to the
cylinder V of the metal pot V. The top of the latter is open to the air. V72 is
a three-way cock in the pipe V to open and shut it and to also establish, at
stated intervals, a connection between the cylinder V49 and the open air through
an exhaust port V73.
The path of the metal from the cylinder V4 to the delivery nozzle 12, is through
a throat and a port V75. The said throat starts from the bottom of the
cylinder 49 and rises up to nearly the top of the metal pot side where it is closed
across its top as shewn. The port V75 extends from the said top of the throat v
to the nozzle, and is, preferably, conical in cross section, its diameter diminish-
ing in the direction of the said nozzle. It is controlled by a correspondingly

page_text: shaped valve V76, the spindle of which works to and fro through the throat side
and a suitable guide V. There is combined with the said port V and valve V76,
a second port 78 situated in the opposite side of the throat 10 and axially
coincident with the conical port V75, and a valve V likewise on the spindle of
the valve V6 and adapted to control the said port V78. The two valves V76
and V7 are so positioned with reference to each other that when one of the two
ports V75, 78, is open, the other one is shut. Further, the cock V already
described and the pair of valves V76 and V79, are so worked that when the
port V75 is open, the pipe V is also open; and that when the port V78 is open,
the pipe V771 is shut and the cylinder V49 is open to the
air through the port V73. 'The means for working, consists of a
half crank V80 fast on the plug of the cock V78; a bar V81 to
which the outer end of the half crank V80 is pivotted; a rod V8 made fast by
its bottom end to the spindle of the valves V76 and V79 by having the said end
passed through that spindle, and standing up above the top of the metal pot V
far enough for its forked top V83 to embrace the said bar V81; a longitudinal
slot V8 in the bar V8, and a pin V85 passed through both the forked end V83
and the slot V8, the latter being wide enough to move freely to and fro over
the pin V8 The respective levels of the metal in the metal pot V and in the
cylinder V49, clearly indicate the expelling action of the compressed air on the
metal in the latter. The bar V81 is worked to and fro by any suitable device.
The figure shews it at the end of its motion to the right hand, which motion has
shut the port V73 and opened the pipe by turning the cock V2 through an
arc of 90°. During the greater part of that motion, the slot V84 was sliding over
the pin V8, but the closed left hand end of it engaged the said pin V85 soon
enough before the motion ceased to close the port Vis and open the port V.
Metal is next ejected by the air pressure in the cylinder 49, through the
nozzle 13, so long as the port V75 remains open. To stop ejection, the bar Vsi
is moved back into its original position, closing the pipe V to shut off air
pressure from the cylinder V, opening the port Vis to exhaust the pressure in the
said cylinder to the air, and sliding the slot V84 over the pin V8 till the right
hand end of it engages the said pin which it does soon enough to move it to the
left far enough to close the port V5 and open the port V8 at the same moment
that the
completes the closure of the pipe V, so that all the metal in
the cylinder V and in the metal pot V around it, assumes the same level and
keeps the throat 10 full.
According to the modification illustrated in Figure 2, the two valves VC, V79
are replaced by a plug cock V8 reciprocating about its axis in its barrel V87.
The cock V8, nozzle 12, port V8 and throat 10, are all illustrated as near
the bottom of the metal pot V instead of near the top, the throat being
horizontal for that purpose instead of upwardly bent as in Figure 1, but such
change of position does not affect the present invention and is only to facilitate
the moulding and casting of the pot and the throat 2:10.
The means for working the three-way cock V2 and the valve cock V8, consists
of a bar V90; a lever a fast on the plug of the cock and pivotally con-
nected by one arm to the bar V90; a lever V92 fast by one end to the axle V93
of the cock V86 and pivotally connected by its opposite end to one end of a
link V which has its opposite end pivotally connected to the other arm of the
lever V. The parts are shewn in the metal ejecting position, the motion of the
bar V90 to the left hand having opened the delivery pipe V, shut the exhaust
port V73 and the metal port V8, and opened the port V75. To stop the ejection of
metal, the bar V90 is moved to the right thereby opening the exhaust port V,
shutting the delivery pipe V and turning the valve V8 to shut the port V75
and open the port Vis. The bar V90 is worked in the same way as the bar V81.
Both the volume of air allowed to pass the three-way cock V and the
pressure of it at that moment, are adjusted to the amount of metal to be ejected
through the nozzle 1

page_text: 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 :-
1. The herein before described combination with the metal pot of a casting
mechanism, of air pressure supply to pump cylinder; exhaust from the latter
to the air and a cock controlling both; port to the delivery nozzle; throat or
chamber between it and the pump cylinder; port from the metal pot to the said
throat or chamber; valves or a cock controlling the said two ports; and means
for working the said cock and two valves or one cock as specified.
2. The hereinbefore described combination with the metal pot of a casting
mechanism, of compressed air chamber; cylinder; delivery pipe between the two;
exhaust port from the said pipe to the open air; three-way cock controlling the
said delivery pipe and port; throat from the cylinder in the direction of the
delivery nozzle; port between the throat and the said nozzle; port between
the throat and the metal pot; valves adapted to control the last mentioned ports
respectively and means for working the three-way cock and the said valves to
keep the said delivery pipe and port to nozzle open and the exhaust port and the
port between the throat and the metal pot closed, and vice versa.
3. The herein before described combination with the metal pot of a casting
mechanism, of compressed air chamber; cylinder; delivery pipe between the
two; exhaust port on the said pipe to the open air and three-way cock controlling
the said delivery pipe and port; throat or chamber communicating with the said
cylinder; port from said throat or chamber to the nozzle; port from the metal
pot to the said throat or chamber; cock adapted to control the two last mentioned
ports; and means for working the said three-way cock and the cock for con-
trolling the throat or chamber ports on the other, to keep the delivery pipe and
port to nozzle open and the exhaust port and the port from the metal pot closed,
and vice versa.
Dated 1 1011 L
1000
CHAS. S. WOODROFFE, Fel. Ch. Inst. P.A.,
188, Fleet Street, E.C.,
Agent for the Applicants.