Improvements in the Construction of Elastic Tyres, and in the Mode of Fitting the same to Velocipede and other Wheel Rims.
Year: 1893

page_text: Date of Application, 22nd Aug., 1893-Accepted, 23rd Sept., 1893
COMPLETE SPECIFICATION.
Improvements in the Construction of Elastic Tyres, and in the Mode
of Fitting the same to Velocipede and other Wheel Rims.
1, CHRISTIAN HAMILTON GRAY of Silvertown in the County of Essex,
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:-
This invention relates to that class of elastic tyre which is composed of a cover
that carries the tread, and retains in place upon the wheel rim an elastic filling
consisting either of a pneumatic annular tube or a solid ring of rubber compound.
According to my invention, I use a rim grooved near its edges to receive beads
formed on the edges of the cover, and I so shape these grooves and beads, as to
facilitate the interlocking of the parts, as will be hereafter explained.
In the accompanying drawing,
Fig. 1 shows in cross section a wheel rim and tyre constructed and fitted
according to my invention.
Fig. 2 is a partial plan view of the wheel rim, showing the openings in the rim
grooves for the admission of the beads end wise into the annular grooves.
Fig. 3 is a cross section of the elastic tyre fitted to the wheel rim, the section
being taken on the line 1-2 of Figs. 2 and 4.
Fig. 4 is a partial plan view of the cover inverted, portions of the beads being cut
away, to provide for the insertion endwise of the beads into the grooves.
The same letters of reference designate like parts in all the figures.
a a is the cover made of canvas, india rubber, or other suitable vulcanizable
materials, and formed into a hoop, as usual. The edges of the cover are thickened
into beads, by rolling up the edges until the desired thickness is obtained, as
shown at b b.
cc is the wheel rim formed with annular grooves d d, which are enlarged
laterally, at d*, to permit of the entrance of the beads into grooves d d.
To provide for the entrance endwise of the beads of the cover, the beads are
cut away, as at 6*, the web only of the beads remaining, which conform in thick-
ness (or thereabouts) with the annular opening in the grooves. The cover a is
fitted to the wheel rim after the pneumatic tube or other elastic ring filling e has been
sprung into place, and on the ends of the beads being inserted into their respective
grooves, the cover is drawn around over the wheel rim, until the beads have
completely entered into and fill the grooves. Screws ff are then passed through
the lips of the openings d*, and through the edges of the cover, where the lines of
the beads are broken, as at 6*, and thus the creeping of the cover on the rim is
prevented.
I may make the filling tube of non-vulcanisable rubber, in part or wholly, as
described in the Specifications of my Patents dated respectively No. 1015
20th January 1891, and No. 479, 9th January 1892, as I thereby obtain the
advantage of maintaining the efficiency of the pneumatic tyre, notwithstanding the
tube may be pierced by a sharp stone, or other obstruction met with on the road.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that I am aware
that it has been previously proposed to use a rim grooved near its edges to receive
beads formed on the edges of the cover, and I make no general claim to such
arrangement, but what I claim is :-
:-
The manufacture of elastic tyres, and the mode of fitting the same to velocipede
and other wheel rims, as and for the purpose above set forth.
Dated this 21st day of August 1893.
NEWTON & SON,
Agents for the Applicant.