IMPROVEMENTS IN THE PROPELLING WHEELS FOR ROAD LOCOMOTIVE ENGINES
Year: 1871

page_text: LETTERS PATENT to John Pinchbeck, of 27, Leadenhall Street, in
the City of London, County of Middlesex, Engineer, for the Inven-
tion of "IMPROVEMENTS IN THE PROPELLING WHEELS FOR ROAD LOCOMOTIVE
ENGINES."
Scaled the 19th September 1871, and dated the 23rd March.1871.
PROVISIONAL SPECIFICATION left by the said John Pinchbeck at the
Office of the Commissioners of Patents, with his Petition, on the
23rd March 1871.
I, JOHN PINCHBECK, of 27, Leadenhall Street, in the City of London,
County of Middlesex, Engineer, do hereby declare the nature of the
said Invention for "IMPROVEMENTS IN THE PROPELLING WHEELS FOR ROAD
LOCOMOTIVE ENGINES," to be as follows:-
The object of this Invention is to obtain increased elasticity with a
reduced weight in the india-rubber tyres of road engines, and this I
effect in the following manner :-The drum or cylindrical part of the
wheel, instead of being formed of a plain plate of iron as is usually
the case, has a corrugated section, which may be either convex, concave,

page_text: or ridges and furrows upon which the india-rubber forming the tyre
rests. Similar corrugations, convex, concave, or ridges and furrows,
are formed on the under side of the india-rubber tyres, which do not
fit into the iron indentations but only touch at their bottoms, thus
leaving certain side spaces into which the india-rubber tyres is pressed
when the weight of the engine is on that particular portion of the wheel,
which prevents any slipping of the tyres on the wheels. The india-
rubber is held in its place by means of straps, which are themselves
held in their respective places by means of square studs fixed to the
sides of the wheel, and by square bolts working through slots made in
the inner portion of the same, so that they vary in position from the
centre of the wheel, while at the same time the relative position of
the shoes on the periphery of the wheel is maintained by reason of the
studs and the slots aforesaid. In cases where less elasticity of wheel is
required I make the india-rubber tyres fit in the corrugations or ridges
and furrows without leaving the side spaces as before described.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Pinchbeck in the Great Seal Patent Offico
on the 22nd September 1871.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
PINCHBECK, of 27, Leadenhall Street, in the City of London, County of
Middlesex, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-third day of March, in the year
of our Lord One thousand eight hundred and seventy-one, in the thirty-
fourth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said John Pinchbeck, Her special licence
that I, the said John Pinchbeck, my executors, administrators, and
assigns, or such others as I, the said John Pinchbeck, my 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 for "IMPROVEMENTS IN
PROPELLING WHEELS FOR ROAD LOCOMOTIVE ENGINES," upon the condition

page_text: (amongst others) that I, the said John Pinchbeck, my executors or
administrators, by an instrument in writing under my, or their, or onc
of their hands and seals, should particularly describe and ascertain the
nature of the said Invention, and in 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 and immediately after the date
of the said Letters Patent.
NOW KNOW YE, that I, the said John Pinchbeck, do hereby declare
the nature of said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement:―
The object of this Invention is to obtain increased clasticity with a
reduced weight in the india-rubber tyres of road engines, and this I
effect in the following manner:-The drum or cylindrical part of the
wheel, instead of being formed of a plain plate of iron as is usually
the case, has a corrugated section, which may be either convex, concave,
or ridges and furrows upon which the india-rubber forming the tyre
rests. Similar corrugations, convex, concave, or ridges and furrows,
are formed on the under side of the india-rubber tyres, which do not
fit into the iron indentations but only touch at their bottoms, thus
leaving certain side spaces into which the india-rubber tyre is pressed
when the weight of the engine is on that particular portion of the wheel,
which prevents any slipping of the tyres on the wheels. The india-
rubber is held in its place by means of straps, which are themselves
held in their respective places by means of square studs fixed to the
sides of the wheel, and by square bolts working through slots made in
the inner portion of the same, so that they vary in position from the
centre of the wheel, while at the same time the relative position of
the shoes on the periphery of the wheel is maintained by reason of the
studs and the slots aforesaid. In cases where less elasticity of wheel is
required I make the india-rubber tyres fit into the corrugations or ridges
and furrows without leaving the side spaces as before described.
In the annexed Drawing Fig. 1 is a part longitudinal section of the
tyre (which is formed in suitable segments), and also a part elevation
of the rim of the wheel; Fig. 2 is a cross section of the same.
A is the corrugated plate; B, the segments of india-rubber which
form the tyre; C, the shoes to hold the segments in their places;
D, D, are square studs rivetted to the sides of the wheel; E, E, square

page_text: bolts which work in the slots F, F, and which allow the shoes C, C, to
vary in position from the centre of the wheel, and at the same time
maintain their relative distances.
In witness whereof, I, the said John Pinchbeck, have hereunto sct
my hand and scal, this Twenty-second day of September, in the 5
year of our Lord One thousand cight hundred and seventy-one.
JOHN PINCHBECK. (L.S.)