IMPROVEMENTS IN THE MANUFACTURE OF WROUGHT IRON RIGGERS OR BAND WHEELS
Year: 1881

page_text: LETTERS PATENT to Arnold Goodwin, of Sumner Street, Southwark, in the
County of Surrey, Engineer, for an Invention of “IMPROVEMENTS IN THE
MANUFACTURE OF WROUGHT IRON RIGGERS OR BAND WHEELS."
PROVISIONAL SPECIFICATION left by the said Arnold Goodwin at the
Office of the Commissioners of Patents on the 27th September 1881.
ARNOLD GOODWIN, of Sumner Street, Southwark, in the County of Surrey,
Engineer. "IMPROVEMENTS IN THE MANUFACTURE OF WROUGHT IRON RIGGERS
OR BAND WHEELS."
My Invention consists in an improved manufacture of wrought iron riggers or
band wheels, having at the periphery a convex form in cross section. For this
purpose I use in the manufacture of such riggers or wheels wrought iron bars
having in cross section a plano convex shape, or in other words, the form of a
segment of a circle, or approximately so. The bars may be without the sharp edges
corresponding to the points at which the chord meets the arc. The bar so formed
I bend into the form of a circle, so that its two ends abut; then I connect these
together by a plate at the inner circumference and secure the same by rivets; or
the circle may be composed of two or more plano convex bars bent to the form of
part circles and joined together, as described. Within this rim I secure a nave
with spokes or a disc, or other suitable wheel body, as well understood.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Arnold Goodwin in the Great Seal Patent Office on the 22nd March
1882.
ARNOLD GOODWIN, of Sumner Street, Southwark, in the County of Surrey,
Engineer. "IMPROVEMENTS IN THE MANUFACTURE OF WROUGHT IRON RIGGERS
OR BAND WHEELS."
My Invention consists in an improved manufacture of wrought iron riggers or
band wheels (or pulleys), having at the periphery a convex form in cross section.
For this purpose I use in the manufacture of such riggers or wheels wrought iron
bars, having in cross section a plano-convex shape, or in other words, the form of
a segment of a circle or approximately so. The bars may be without the sharp
edges corresponding to the points at which the chord meets the arc. The bar so
formed I bend into the form of a circle so that its two ends abut; then I connect
these together by a plate at the inner circumference and secure the same by rivets;
or the circle may be composed of two or more plano-convex bars bent to the form
of part circles and joined together, as described. Within this rim I secure a nave
with spokes or a disc or other suitable wheel body, as well understood.
--In-the-accompanying Drawings Fig. 1 illustrates in cross section a bar of
_wrought iron of suitable plano-convex section to form the-rim-or-periphery_of_a_
rigger or band wheel (or pulley) according-to-my Invention; Fig. 2 is a cross
section of a wheel complete in line x, x, of Fig. 3; and Fig. 3 is a side elevation
thereof. The rim or periphery of this improved rigger or band wheel is, according
to my Invention, formed out of two wrought iron bars a, each having in cross
section a plano-convex shape, or, in other words, the form of a segment of a circle
or approximately so, and being without the sharp edges corresponding to the points
at which the chord meets the arc, as shewn in Fig. 1, where a¹ is the flat sido,
a² the convex side, and a³, a³, are the flat edges. The bars so formed are bent cach
into the form of a half circle, so that the two ends of the one bent bar will abut
respectively against the corresponding two ends of the other har, the abutting ends
being connected together by a plate at the inner circumference (in the example
shewn the plate is formed as one end of a spoke) and secured thereto by rivets as
at b. Within the rim so formed is secured a nave o and spokes d, or a disc or
other suitable wheel body of the ordinary construction may be used. The pulley
or wheel shown in the Drawings is of the kind known as a "split pulley," and the
nave or contre is made in two parts e, e, each having formed with it or attached
to it three of the six spokes. The two parts c, o¹, of the unve or centre aro fastened
together by bolts f. Obviously the construction of the body and the number of
spokes (where spokes are used) may be varied, and also the dimensions and pro-
portions and form of the parts may be variously modified without departure from
the characteristic features of my Invention.
Having described the nature of my said Invention, and the manner of carrying
it into practical effect, what I claim is,―
1. The hereinbefore described improvement in the manufacture of wrought iron
riggers or band wheels, which consists in making the rim or periphery by bending
or curving to a circle of the required radius a bar or bars of metal having a plano-
convex form in cross-section (that is to say, flat on one side and convex on the
other side), as above set forth.

page_text: 2. The improved wrought iron rigger or band wheel, constructed as above
described and shown in the Drawings.
In witness whereof, I, the said Arnold Goodwin, have hereunto set my hand
and seal, this Twenty first day of March, in the year of our Lord One
thousand eight hundred and eighty two.
ARNOLD GOODWIN. (L.S.)