IMPROVEMENTS IN VELOCIPEDES
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by the said Llewellyn Aviss at the
Office of the Commissioners of Patents on the 5th October 1880.
LLEWELLYN AVISS, of Gosford Street, Coventry, in the County of Warwick.
"IMPROVEMENTS IN VELOCIPEDES."
The improvements apply particularly to that class of velocipedes having three
bearing wheels, and they relate to means for obtaining increased speed when
employing comparatively small driving wheels.
In carrying out my Invention I apply to the axle of the treddles, or it may be
other axle, a wheel with teeth operating internally upon the teeth of a smaller
wheel on the axis of the driving wheel.
I also for the purpose of increased stability pass this axis through a hollow
socket carried by the frame of the velocipede.
Change motion wheels may be employed.
The method of giving motion to the driving wheel is also applicable to bicycles.
The teeth to the larger wheel in place of being fixed may be applied to short
arms aided by springs and stops, and the difference of relative speed will be
obtained by change of relative position of the axes of the two toothed wheels.
The teeth to the short arms may be formed by double inclines to work in
corresponding double inclined recesses in the smaller wheel and to enable them to
act in opposite directions, or the parts may act in pairs.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Llewellyn Aviss in the Great Seal Patent Office on the 2nd April
1881.
LLEWELLYN AVISS, of Gosford Street, Coventry, in the County of Warwick.
"IMPROVEMENTS IN VELOCIPEDES."
The improvements apply particularly to that class of velocipedes having three
bearing wheels, and they relate to means for obtaining increased speed when
employing comparatively small driving wheels.
In carrying out my Invention I apply to the axle of the treddles, or it may be
other axle, a wheel with teeth operating internally upon the teeth of a smaller
wheel on the axis of the driving wheel.
I also for the purpose of increased stability pass this axis through a hollow
socket carried by the frame of the velocipede.
Change motion wheels may be employed.
The method of giving motion to the driving wheel is also applicable to bicycles.
The teeth to the larger wheel in place of being fixed may be applied to short
arms aided by springs and stops, and the difference of relative speed will be
obtained by change of relative position of the axes of the two toothed wheels.
The teeth to the short arms may be formed by double inclines to work in
corresponding double inclined recesses in the smaller wheel and to enable them to
act in opposite directions, or the parts may act in pairs.
But that the Invention may be better understood, I will by the aid of the
accompanying Drawings proceed to describe means pursued by me in carrying the
same into effect.
DESCRIPTION OF THE DRAWINGS.
Figure 1 shows a front view of parts of a tricycle arranged according to my
Invention partly in section; Figure 2 shews parts separately.
The
In each of the Figures the same letters are employed to indicate corresponding
parts; a and b represent the two opposite bearing wheels, and c the framing
between them; d is the treddle axle with its cranks forming the treddles d', d'.
This axle d is supported to revolve in bearings carried by the framing c.
wheel a in use simply revolves on a fixed axle or spindle e carried by the main
framing c; but if desired this wheel a may also be operated as the wheel b. The
wheel b in use is also capable of revolving on a spindle f, which is formed hollow
as a socket to admit of the passage through it of a spindle g, the outer end of
which is connected to the boss of the wheel b so as to revolve with that wheel,
whilst on the inner end of this spindle £ is affixed a pinion h, the teeth of which
take into the internal teeth of the wheel i which is affixed on one end of the
treddle axle d. The teeth to the wheel i may be formed, as shown, or by pins, or
studs, or otherwise.
Figures 3 and 4 show this method of giving motion to the driving wheel applied
to a bicycle. The axle of the driving wheel b has affixed on each end of it a
pinion h, the teeth of which are respectively taken into by the internal teeth of
the wheels i, . The wheels i, i, are supported to revolve on pins i projecting
from the main frame c, and they are provided with treddles 12, 12, rocking on pins
carried by the wheels i.
Having thus described my Invention and means which I adopt in carrying the
same into effect, I would have it understood that what I claim is the arranging or

page_text: combining parts of velocipedes, whereby increased speed from the treddles to the
driving wheels may be obtained as described.
In witness whereof, I, the said Llewellyn Aviss, have hereunto set my
hand and seal, this Twenty ninth day of March, in the year of our Lord
One thousand eight hundred and eighty one.
LLEWELLYN AVISS. (L.S.)