AN IMPROVE- MENT IN METAL WHEELS FOR RAILROAD CARS AND OTHER VEHICLES
Year: 1867

page_text: LETTERS PATENT to George Nimmo, of Jersey City, in the State of New;
Jersey, United States of America, for the Invention of "AN IMPROVE-
MENT IN METAL WHEELS FOR RAILROAD CARS AND OTHER VEHICLES."
PROVISIONAL SPECIFICATION left by the said George Nimmo at the
Office of the Commissioners of Patents, with his Petition, on the
15th May 1867.
1, GEORGE NIMMO, of Jersey City, in the State of New Jersey, United
States of America, do hereby declare the nature of the said Invention for
"AN IMPROVEMENT IN METAL WHEELS FOR RAILROAD CARS AND OTHER VEHICLES,”.
to be as follows:-
I take a metal ring of wrought iron or steel to form the tire of the wheel;
the same may be a new ring, or it may be an old wrought-iron wheel or tyre,:
and I bore, cut, or form round, oblong, or polygonal holes into or through
the same at suitable distances apart around the periphery, and I turn or cut,
grooves in the cylindrical surface of such ring near the edges thereof; said,
grooves are of any desired sectional shape, I however, prefer to make them.>
V-formed.

page_text: I prepare a mould either in sand or metal of a shape corresponding to the
exterior of the intended wheel and adapted to receive the said metal ring,
and I place such metal ring in said mould and cast around the same iron or
steel, or a mixture thereof, of the desired character, and it forms a complete
union with such metal ring in consequence of the grooves and holes in the
same, so that the cast metal tire and wrought metal ring are inseparable, thus
obtaining the lightness and strength of the wrought metal wheel and the
durability under wear of the cast metal surface. The wrought ring may be
heated before being placed in the mould, and a flux employed to effect a more
firm union of the metals. The wrought ring may be made of wire or rods
of any desired size or shape wound up into a circular form with one or more
layers of such wires or rods, and the ends tapered or scarfed so as to make a
complete wheel or ring for receiving the cast metal, and where steel is cast
upon the wrought ring the whole may be rolled, hammered, or otherwise
worked into the proper size and shape.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said George Nimmo in the Great Seal Patent Office on the
15th November 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
NIMMO, of Jersey City, in the State of New Jersey, United States of
America, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fifteenth day of May, A.D. One thousand
eight hundred and sixty-seven, in the thirtieth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me,
the said George Nimmo, Her special license that I, the said George
Nimmo, my executors, administrators, and assigns, or such others as I,
the said George Nimmo, ny executors, administrators, and assigns,
should at any time agree with, and no others, from time to time and 'at:
all times thereafter during the term therein expressed, should and lawfully
might make, use, exercise, and vend, within the, United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an Invention
of "AN. IMPROVEMENT IN METAL WHEELS FOR RAILROAD CARS AND OTHER
VEHICLES," upon the condition (amongst others) that I, the said George,
Nimmo, by an instrument in writing under my hand and seal, should par-
ticularly describe and ascertain the nature of the said Invention, and in

page_text: what manner the same was to be performed, and cause the same: to be:
filed in the Great Seal Patent Office within six calendar months next 'andi
immediately after the date of the said Letters Patent.
:)
NOW KNOW YE, that I, the said George Nimmo, do hereby declare)
the nature of my said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following?
statement, reference being had to the Drawing hereunto annexed and to the
letters and figures marked thereon (that is to say)
I take a metal ring of wrought iron or steel to form the tire of the wheel;
the same may be a new ring or it may be an old wrought-iron wheel or tire,
and. I bore, cut, or form round, oblong, or polygonal holes into or through
the same at suitable distances apart around the periphery, and I turn or cuty
grooves in the cylindrical surface of such ring near the edges thereof;) said
grooves are of any desired sectional shape, I however, prefer to make them
V-formed.
I prepare a mould either in sand or metal of a shape corresponding to the
exterior of the intended wheel and adapted to receive the said metal ring,
and I place such metal ring in said mould and cast around the same iron or'
steel, or a mixture thereof, of the desired character, and it forms a complete
union with such metal ring in consequence of the grooves and holes in the
same, so that the cast metal tire and wrought metal ring are inseparable, thus
obtaining the lightness and strength of the wrought metal wheel and the
durability under wear of the cast metal surface. The wrought ring may be
heated before being placed in the mould, and a flux employed to effect a more
firm union of the metals. The wrought ring may be made of wire or rods
of any
desired size or shape wound up into a circular form with one or more
layers of such wires or rods, and the ends tapered or scarfed so as to make a
complete wheel or ring for receiving the cast metal, and where steel is cast
upon the wrought ring the whole ring may be rolled, hammered, or otherwise
worked into the proper size and shape.
In
I have represented in the Drawing a ring formed as before described.
this Fig. 1 is a cross section of the ring, and Fig. 2 is a side view of the
same, a portion being in section.
a is the wrought metal ring formed in either of the modes before mentioned ;
and 6 is the tire or extra ring of iron or steel cast around the wrought wheel
or ring as aforesaid; c, represents the dovetail casting to hold the parts firmly
together; and the holes through or partially through the wrought metal ring
or wheel into which the cast metal flows to aid in strengthening the union of
the parts. The metal wheel or tire formed in the aforesaid manner is very

page_text: strong and the surface can be of any desired hardness, the strength of wrought
iron being combined with the durability and hardness of surface of cast iron
or steel. This wheel or ring may be employed on cars, or locomotives, on
carriages, or under any other circumstances wherever available.
What I claim and desire to secure by Letters Patent is, the wheel or ring
formed of a cast iron or steel surface upon a wrought metal ring or wheel,
substantially as set forth.
In witness whereof, I, the said George Nimmo, have hereunto set my
hand and seal, this Sixteenth day of September, A.D. One thousand
eight hundred and sixty-seven.
Witnesses,
CHAS. H. SMITH,
121, Nassau St., New York.
GEO. T. PINCKNEY,
121, Nassau St., New York.
GEORGE NIMMO. (L.S.)