An Improvement in the Construction of Bicycles or Tricycles.
Year: 1889

page_text: Date of Application, 14th Aug., 1889
Complete Specification Left, 12th May, 1890-Accepted, 5th July, 1890
PROVISIONAL SPECIFICATION.
An Improvement in the Construction of Bicycles or Tricycles.
I WILLIAM ROWTHORN of Oughtibridge near Sheffield in the County of York
Clerk in Holy Orders do hereby declare the nature of this invention to be as
follows:-
My Invention relates to and consists in an improvement in the construction of
bicycles, which is also applicable to tricycles, whereby I so construct the hindmost,
or either or both of the wheels that it (or they) shall he made with a double, or two-
fold, or divided, tyre.
These twofold tyres will be fixed more or less wide apart as thought necessary,
they will then forin what I call a bisectional or twin wheel.
and
The advantages attained by this mode of construction are:-increased stability and
self support increased safety and steadiness when used in riding; and increased
elegance of motion and action.
The spokes of the wheels made with the tyres according to my invention can be
transverse or otherwise.
1001
BRISTOW HUNT, R.P.A.,
Aldine Chambers, High Street, Sheffield, Agent for the Applicant.
COMPLETE SPECIFICATION.
An Improvement in the Construction of Bicycles or Tricycles.
I WILLIAM ROWTHORN of Oughtibridgo near Sheffield in the County of York
Clerk in Holy Orders 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 in writing, that is to say :-
My Invention relates to, and consists in, a simple and useful improvement in the
construction of bicycles, which improvement can also be usefully applied in the con-
struction of tricycles, whereby I construct or make either, or both, of the wheels of a
bicycle, or one, or two, or all the wheels of a tricycle so that it, or they will severally
be made with a double or twofold separated or divided tyre thereon, or what may be
termed a twin safety tyre.
These twofold or separated or divided tyres are arranged so as to be placed and
fixed more or less widely apart from each other, as found necessary according to the
size or strength of the bicycle or tricycle, and thus they make and form what I call a
bi-sectional or twin wheel, that is to say:-a wheel (or wheels) with two separated or
divided, or twin tyres.
This wheel has but one axle frame or box bearing, or an axle frame or box bearing
cut in half, or bi-sectional, from which the spokes of the wheel proceed or extend
outwardly from the axle to the divided or twin wheel tyres.
The spokes of the bicycle or tricycle wheels, which are made and arranged to be
transverse (or they may be made and affixed otherwise if required) are inserted and
fixed in the axle frame or box bearing which surrounds and is secured to the axle of
the bicycle or tricycle wheel, and at their other ends they are alternately or otherwise
inserted in and firmly secured to one and the other of the divided tyres of either
or all of the wheels. Where however greater strength is required, or when other-
wise thought advantageous, the spokes can be braced or tied together at about half-
way of their length, or at their point of crossing, thus uniting the spokes as they cross
each other, as it were, something in the manner like a pair of scissors.

page_text: In order that my said invention may be more fully understood, on the accompanying
sheet of drawings I have shown, for an example, one method of carrying it into
practical effect.
Figure 1, is a front view of a bicycle or tricycle wheel as made with my double or
twin tyre.
Figure 2, is a side or end elevation of the same, but distinctly showing my double
or twin tyre, and
Figuro 3, is a sectional elevation made on the line A-B of Figure 1.
a, a, in Figures 2, and 3, represent the double or twin tyres. b, b, in all the Figures
are the spokes of the wheel, and c, is the axle frame or box bearing (or bush) in
which the spokos b, b, are fixed and extend outwards to the double or twin tyres a, a.
The spokes marked d, which are shown blackened in Figure 1, are fixed in or attached
to the near side of the axle frame or box bearing (or bush) c, and to the back side of
one of the double tyres. The spokes e, which are shown plain in Figure 1, are fixed
in or attached to the near side of the box bearing c, and to the near tyre. As before
described the spokes can be braced or tied together at about halfway of their lengths
or where they cross each other, such as at the parts marked f, in Figure 3.
Bicycles or tricycles constructed according to my invention with divided or twin
tyres encircling and fixed on one or more of their wheels will ensure greater stability
or self support whon being riddon, also greatly increased safety and steadiness, and at
the same time increased elegance of motion and of action is obtained.
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
The novel and peculiar construction of bicycles or tricycles in which one or more
of the wheels thoreof is (or are) made with double or divided or separate tyros
attached thereto, thereby ensuring greater safety, stability, and steadiness, when
being ridden; substantially as herein before described and as illustrated on the
accompanying sheet of drawings, or any equivalent modification thereof.
Dated this 10th day of May 1800
BRISTOW HUNT, R.P.A.,
Aldine Chambers, Sheffield, Agent for the Applicant.