Improvements in Metall
Year: 1898

page_text: I, CHARLES KINGSTON WELCH, of Park House, Coventry, in the County of
Warwick, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in metallic wheel-rims for use with
pneumatic tyres, and is more especially applicable to rims designed for use with
tyres constructed according to the Specification of my prior Letters Patent
No. 14,563 of the year 1890.
Rims for such tyres have been constructed with the edges of said rims bent
over inwardly, or toward each other, in such manner as to form tubular flanges
or shoulders of circular cross section, which not only serve to stiffen the rin
but also serve as abutments or surfaces against which the inextensible edges of
the tyre cover and the adjacent side portions thereof may rest.
The object of my invention is to so form these flanges that the width of the
rim is reduced and a lighter and neater appearance is given thereto, while more
efficient shoulders or bearing surfaces for the edges and sides of the tyre cover
are provided.
According to my invention, instead of forming the tubular flanges of the rim
circular in cross section, I form them in the shape of an ellipse, or approximating
thereto, the major axis of which ellipse is inclined outwardly. The whole of
the inner and upper side of these elliptical flanges (i.e. the side adjacent to the
tyre) from the inner extremity of the ellipse where the inextensible edge of the
tyre cover will rest, to the outer extremity of such ellipse is thus available for
the tyre to bear against. The outer and under side of the ellipse does not project
further from the central plane of the rim than does the outer extremity of such
ellipse, so that no greater width is given to the rim than is useful for the purpose
of forming an abutment or bearing surface for the tyre.
Doted this 5th dox of July 1898
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
Improvements in Metallic Wheel-rims.
I, CHARLES KINGSTON WELCH, of Park House, Coventry, in the County of
Warwick, Engineer, 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;-
-

page_text: pneumatic tyres, and is more especially applicable to rims designed for use with
yres constructed according to the Specification of my prior Letters Patent
No. 14,563 of the year 1890.
Rims for such tyres have been constructed with their edges bent over inwardly,
or toward each other, in such manner as to form tubular flanges or shoulders of
circular cross section which not only serve to stiffen the rim but also serve as
abutments or surfaces against which the inextensible edges of the tyre cover and
its adjacent side portions may rest.
The object of my invention is to so form these flanges that the external width
of the rim is reduced without necessarily diminishing the internal width thereof
and a very light and neat appearance is thus given thereto, while the shoulders
or bearing surfaces for the edges and sides of the tyre cover are rendered more
efficient than heretofore.
According to my invention, instead of forming the tubular flanges of the rim
circular in cross section, I form them in the shape of an ellipse, or of a figure
approximating thereto, the major axis of which is inclined outwardly.
In order that my said invention may be clearly understood and readily carried
into effect I will proceed to describe the same more fully with reference to the
accompanying drawings in which:
Figure 1 is a transverse section and Figure 2 a perspective view of part of a
wheel rim having tubular flanges or shoulders of ordinary construction.
Figures 3. and 4 are similar views of a wheel-rim having tubular flanges or
shoulders constructed according to my invention.
Figures 5 and 6 are also similar views shewing a wheel rim having tubular
flanges or shoulders constructed according to a modification of my invention.
Like letters of reference indicate similar parts in all the figures.
A is the rim and B B are the tubular flanges or shoulders thereof.
Referring more particularly to Figures 3 and 4 each of the tubular flanges is
in the shape of an ellipse with the major axis (represented by the dotted lines x,
in Figure 3) inclined outwardly with respect to the vertical line y y. The whole
of the inner and upper side of these elliptical flanges (i.e. the side adjacent to
the tyre) from the inner extremity where the inextensible edge of the tyre
cover will rest, to the outer extremity 63, is thus available for the side portions
near the edges of the tyre cover to bear against where such portions are pressed
outwardly by the perpetual lateral deformation of the tyre which takes place at
a point near the ground during the revolutions of the wheel while in contact
with the road. The outer and underside 63 of the ellipse does not project further
from the central plane of the rim represented by the aforesaid vertical line y y,
than does the outer extremity 62 of such ellipse, so that no greater width is
given to the rim than is useful for stiffening the edges thereof, and I obtain
the maximum amount of width of the rim internally with the minimum amount
of width externally.
In the modification of the rim shown in Figures 5 and 6, the inner side 6 of
each of the ellipses B is not symmetrical with the outer side 63 as in Figures 3
and 4, but is of a different curvature so that the outer extremity 62 is wider and
flatter and the portion near the inner extremity 6 is inclined inwardly to a
greater extent than in Figures 3 and 4.
On comparison of my improved rim with the old form of rim illustrated in
Figures 1 and 2 it will be seen that my rim has a more pronounced dovetail
between the portions 61 61 and that the total external width of the rim is reduced
without necessarily diminishing the internal width.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I claim
is:

page_text: approximately elliptical shape in cross-section with their major axes inclined
outward relatively to each other for the purposes specified.
2. A wheel rim constructed substantially as described with reference to Figures 3
and 4 or Figures 5 and 6 of the accompanying drawings for the purposes specified.
Dated this 5th day of April 1899.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.