Year: 1888

page_text: JOHN ELYOTT DOYLE 52 Dunstall Road Wolverhampton, in the County of Stafford,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention has for its object an improved method of "gearing up" the driving
wheels of Bicycles, Tricycles & similar vehicles. In carrying it out, I make the hub
with a hollow spindle, so as to allow a solid spindle to work freely in it. On the
hollow spindle of the hub is fixed a toothed wheel, and on the solid spindle is also fixed
a toothed wheel of a larger diameter than the one on the hollow spindle. On the solid
spindle are also fitted the cranks and pedals as in an ordinary Bicycle.
Immediately above, or below, or at the side of these two toothed wheels are placed
two other toothed wheels, so fitted as to work freely on a stationary spindle but either
separate, or cast or forged in one piece, or so joined as to revolve together. These
latter are of such a size as to gear into the wheels on the hollow and solid spindles
respectively.
When in work, the pedals cause the solid spindle to revolve, and with it the
toothed wheel fixed thereon.
This toothed wheel causes the toothed wheel with which it is engaged to revolve also,
but at a greater speed, and as this toothed wheel is fixed to another toothed wheel,
which latter drives the toothed wheel on the hollow spindle, the latter and also the hub
of the wheel to which it is fixed is caused to revolve at a speed proportionately greater
than the revolution of the pedals.
This invention is especially applicable to what are known as "Safety bicycles" in
which it is necessary to cause the driving wheel to rovolve at a greater speed than the
pedals.
1000

page_text: JOHN ELYOTT DOYLE Engineer, Herbert Street Wolverhampton 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 has for its object an improved method of "gearing up.
"the driving
wheels of Cycles, Bicycles, Tricycles, Safetys and the like. In carrying it out, I make
the hub with a hollow spindle, so as to allow a solid spindle to revolvo freely thorein.
On to the hollow spindle of the hub & up against the face of the flange is fixed a
toothed wheel (1 in the drawing). On to the solid spindle is also fixed a toothed
wheel (2) of larger diameter than the former. On to the solid spindle are then fitted
the bearings and cranks as in ordinary bicycles. Immediately above below or at side
of these two aforesaid toothed wheels, two other toothed wheels (3) and (4) engage
with them. The latter are cast or fitted in one piece, so as to revolve together on a
stationary or revolving spindle (s), and the whole is supported in a shackle (s) which
is brazed, welded or pinned on to the fork. The shackle may be dispensed with by
prolonging the fork below the bearing. The portion below the bearing may be either
bent or straight. In the former case, a shackle or bridge would be formed as in the
figure. In the latter, the small spindle (s) would pass through it and support toothed
wheel (4) outsido the fork. Wheels (2) and (4) would then be outside the fork.
When the improvement is at work, the cranks turn the solid spindle which carries
the largest toothed wheel (2). The latter engaging with wheel (4) causes it to revolve
at a speed increased in proportion to the number of teeth in wheel (2) to those in
wheel (4). Wheel (3) being in one piece with wheel (4) revolves with it, and
engaging with toothed wheel (1), which is fitted on to the hub of the wheel, imparts
the acquired velocity from (4) to the wheel.
The shaded portion of the spindle represents the solid spindle.
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:
(1) Solid spindle revolving in hollow spindle for bicycles.
(2) The gearing of four toothed wheels for multiplying speed.
(3) The fixing these toothed wheels-one on hollow spindle, one on solid spindle,
and the remaining two with which they engage supported by the fork or prolonged
under-gland of bearing.