An Improved Method of and Means for Casting White Metal Couplings and other similar White Metal Objects 'Required to Stand Confined Pressure.
Year: 1890

page_text: Date of Application, 24th Dec., 1890.
Complete Specification Left, 24th Sept., 1891-Accepted, 24th Oct., 1891
PROVISIONAL SPECIFICATION.
An Improved Method of and Means for Casting White Metal
Couplings and other similar White Metal Objects 'Required
to Stand Confined Pressure.
We, GEORGE HILTON SMITH, of Irk View, 'Rhodes, Middleton, 'Machinist,
and BENJAMIN COOPER, of 35, Back George Street, Manchester, Merchant, both
in the County of Lancaster, do hereby declare the nature of this invention to-be as
follows:-
This invention relates to an improved method of and means for casting-white
metal couplings required to stand confined pressure principally for pipe joints such
as described in our Patent No. 3942, dated March 13th, 1890, but which method
and means are equally applicable for the casting of other similar white metal
objects.
In practice we have found it impossible to cast in a sand mould a white 'metal
coupling with a good thread, owing to the sand mould producing a very rough
surface and the coupling not being capable of resisting any desired internal
pressure, thus causing leakage.
"To remedy 'these defects our improvements consist in the first place in casting
white metal couplings or other similar white metal objects, in a chill or metal mould
which gives the coupling or other similar white metal object a very fine surface
and sharp thread equal to being cut.
Our improvements consist in the second place, in increasing the density of
the white metal coupling or other similar white metal object in casting the same by
mechanically forcing and thereby compressing the white metal whilst fluid into the
chill or metal mould, so as to cause the white metal coupling or similar white metal
object thus cast, to stand any desired internal pressure.
The means for forcing and compressing the white metal whilst fluid into the chill
or metal mould consist of a metal pot suitably heated, preferably by means of a
Bunsen burner and internally formed with a cylinder the upper end of which is in
communication with the said pot and the lower end with a channel, which is suitably
connected with the chill or metal mould.
In the said cylinder I employ a piston or ram reciprocated therein. by means of a
lever and formed at its lower end with slots, through which the molten metal is
permitted to pass from the said metal pot into the cylinder when partially
uncovered whilst when covered the metal is forced by the piston or 'ram in front
thereof through the aforesaid cylinder and channel into the chill or metal mould..
In order to prevent the loss of heat we may partially surround the said metal
pot, and the burner heating it, by means of a casing.
Dated this 23rd day of December 1890.
F..BOSSHARDT,& Co.,
Agents to. Applicants.

page_text: UUME DITE SPECIFICATION.
An Improved Method of and Means for Casting White Metal
Couplings and other similar White Metal Objects Required
to Stand Confined Pressure.
We, GEORGE HILTON SMITH of Irk View, Rhodes, Middleton, Machinist and
BENJAMIN COOPER of 35 Back George Street Manchester Merchant both in the
County of Lancaster, 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 relates to an improved method of and means for casting white
metal pipe couplings required to stand confined pressure principally for pipe joints
such as described in our Patent No. 3942, dated March 13th 1890, but which
method and means are equally applicable for the casting of other similar white
metal objects.
In practice we have found it impossible to cast in a sand mould a white metal
pipe coupling with a good screw thread, owing to the sand mould producing a very
rough surface and the coupling not being capable of resisting any desired internal
pressure, thus causing leakage.
And in order that our invention may be more fully understood we have caused
to be appended hereonto one sheet of drawings marked with letters of reference.
and representing partly a vertical section and partly an elevation of the compressing
apparatus employed in connection with our invention.
In carrying out our invention the improvements consist in the first place, in
casting white metal pipe couplings or other similar white metal objects in a chill
or metal mould, which gives the coupling or other similar white metal object a very
fine surface and sharp thread equal to being cut.
Our improvements consist in the second place, in increasing the density of the
white metal pipe coupling or other similar white metal object in casting the same,
by mechanically forcing and thereby compressing the white metal whilst fluid into
the chill or metal mould, so as to cause the white metal coupling or similar white
metal object thus cast, to stand any desired internal pressure.
Referring to the drawing annexed the means employed for forcing and
compressing the white metal, whilst fluid, into the chill or metal mould preferably
consist of a metal pot or vessel a suitably heated by such as a Bunsen burner band
internally formed with a cylinder c, the upper end of which is in communication
with the pot or vessel a and the lower end with a channel or channels & connected,
by means of a pipe d¹ to the chill or metal mould aforesaid such as are used for
other casting purposes.
In the said cylinder c I employ a piston or ram e reciprocated therein by means
of a lever or its equivalent such as a screw f formed on the piston or ram e & a
hand wheel 9 formed with a nut g' retained in position vertically by means of twó
cross pieces secured to the pot or vessel a by means of bolts i. The piston or
ram e at its lower end is formed with slots or grooves k through which the molten
metal is permitted to pass from the metal pot or vessel a into the cylinder c when
partially uncovered, whilst when covered the metal is forced by the piston or rame
in front thereof through the channel or channels & into the chill or metal mould.
In order to prevent the loss of heat we may partially surround the metal pot o
vessel a and the burner b, by means of a casing land to permit of regulating the flow
of molten metal from the cylinder e to the chill or metal mould, we furnish the
channel or channels d respectively with a tap m.

page_text: Having now particularly described and ascertained the nature of our invention
and in what manner the same is to be performed, we declare that what we
claim is :-
1) The use of a chill or metal mould for casting white metal pipe couplings and
other similar objects required to stand confined or internal pressure, substantially
as and for the purpose set forth.
2) The casting of white metal pipe couplings and similar objects required to
stand confined or internal pressure, by compressing and forcing the white metal
whilst fluid into a chill or metal mould, substantially as and for the purpose set
forth.
3) A metal pot or vessel a for melting white metal, formed at its lower end
with a channel or channels & in communication with a chill or metal mould and
with a cylinder c, formed in the metal pot or vessel a in which cylinder c is
arranged to be reciprocated a piston or ram e, substantially as and for the purpose
set forth.
Dated this 23rd day of September.
F. BOSSHARDT & Co.,
Agents to Applicants.