Improvements in and connected with Metallic Moulds, and in the Method of Using such Moulds for Casting Brass or Bronze Alloys.
Year: 1893

page_text: Date of Application, 3rd July, 1893
Complete Specification Left, 8th Mar., 1894-Accepted, 14th Apr., 1894
PROVISIONAL SPECIFICATION.
Improvements in and connected with Metallic Moulds, and in the
Method of Using such Moulds for Casting Brass or Bronze
Alloys.
DAVID PERFITT GRIFFITHS MATTHEWS of Laburnum House Cardiff Road
Newport Monmouthshire Engineer and Brass Founder do hereby declare the
nature of this invention to be as follows
This invention has for its object the manufacture and use of metallic moulds
consisting of any suitable number of parts and such parts held together by bolts,
cramps, or by any other suitable means for the production of finished castings from
such moulds, together with improvements in the treatment of such moulds when in
operation. The same being more suitable for all purposes than at present practised
of moulding in sand or loan and more especially in castings of brass, gun metal or
other metals used in bearings for shafts, rollers or other revolving surfaces, as by
this method of casting in metallic moulds the use of sand or loam is dispensed with
and the quality and nature of the metal is less interfered with, as by the use of sand
moulds much of it is taken up by the fluid metal in filling such moulds with the
necessary metal and the fact of the sands existence in the metal is only discovered
in the working of the bearings in gouging and ribing the axle-journal and thereby
adding greatly to the friction of the parts in wear and tear of the same.
Dated this Third day of July 1893.
D. P. G. MATTHEWS.
Improvements in and connected with Metallic Moulds, and in the
Method of Using such Moulds for Casting Brass or Bronze
Alloys.
I, DAVID PERFITT GRIFFITHS MATTHEWS, of Laburnham House, Cardiff
Road, Newport, in the County of Monmouth, Engineer and Brass Founder, 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 —
My invention relates to improvements in moulds to be employed in casting from
brass, or bronze alloys or other molten metal, bearings, journal-boxes and other
devices or parts to be used as surfaces for the reception of revolving or otherwise
moving parts of machinery, where freedom of action with the least possible friction
is a desideratum.
My invention is designed with a view to dispense with the use of sand or loam
in the building or raming of moulds as hitherto, and to overcome or avoid the
inconveniences arising from the use of such moulds, especially when employed in
fine castings of brass, bronze, gun, bell and similar metals and alloys, and to prevent
the scoring or abrading and overheating of the bearing ends of shafts, rollers, and
other revolving and sliding surfaces, and the frequent serious consequences
arising therefrom, by reason of some portion of the said sand or loam having
become incorporated with the fluid metal in the casting of the bearings of same,
thereby producing or inducing friction, and useless wear and tear of the working
norts

page_text: I carry my invention into effect by casting or otherwise producing from any
suitable metal or metals, a mould of any size, shape or contour, internally and
externally, and which may be composed of any desired number of parts, sections
or sub-sections, according to the nature or design of the article to be cast therein,
and the whole of said parts, sections or sub-sections when finished, I connect
together to form a whole, by the use of bands, clamps, cramps, screws, bolts, pins,
or any other suitable means, by which all the joints may closely fit into or with
each other, and when this is perfected, I coat the whole of the inner surface or
surfaces of the mould, or such parts as are to come in contact with the molten
metal, with a solution prepared from chloride of sodium or common salt and milk,
or any other suitable coating that will protect the mould and produce the smoothest
possible surface or surfaces to the casting made therein. The mould thus con-
structed and prepared, I subject to heat, which may be effected by placing the
same in a stove or furnace, and when this has attained the necessary degree of
temperature, the molten metal would then be poured therein, and when sufficiently
cold the mould may (if necessary) be taken apart, and the casting be removed
therefrom, when the parts of the mould that may have been disconnected or
separated, could be again put together and treated as before, when another or any
number of castings may be taken therefrom without destroying, and with but
slight injury to the mould.
By this means I am enabled to produce almost any number of castings from the
same mould, each of which would be equally sharp in detail, perfectly smooth and
even upon every surface and entirely free from the slightest trace of grit.
Suitable air holes would be provided, when necessary, in each of said moulds, or
in such parts, sections or sub-sections of the same, as the nature of the design or
the metal or both, and other surroundings may require.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I wish it understood, that I
do not claim the use of my said moulds for producing that class of casting
technically known as "chill castings" of cast iron, nor "chill moulds" for cast
iron, but what I do claim is,
The construction and use of metallic moulds, cast or otherwise produced in any
number of parts, sections or sub-sections, retained in position and held together by
the means of bands, cramps, clamps, screws, bolts or pins, in combination with the
method of coating the said moulds internally with a solution of chloride of sodium
or common salt in milk, or any suitable equivalent therefor for attaining the same
ends, as herein set forth, and the manner of heating the said moulds and employing
the same in the production of metal castings, substantially as and for the attainment
of the object and purposes herein described.
Dated this 8th dow of March 1901
GEO. THOS. HYDE,
4, Moorfields, Fore Street, London, E.C., Agent for the Applicant.