Year: 1888

page_text: Date of Application, 23rd June, 1888
Complete Specification Left, 19th Mar., 1889
Complete Specification Accepted, 27th Apr., 1889
declare the nature of this invention to be as follows
To each outer side of the fork or bearing in which the axle of the driving wheel of
the machine runs an eccentric is fixed rigidly so that the axle passes through the
eccentric but does not carry it round with its own revolution.
Outside of each eccentric the axle terminates in a perforated box or short tube fixed
rigidly upon it and revolving with it.
The pedal crank or lever passes through this box, and is made so as to slide back-
wards and forwards through it.
Each eccentric is fitted with a, circular band or strap of any suitable material
fitting closely upon it but so as to admit of its free revolution round the eccentric.
To one end of the crank or lever the pedal is fixed in the ordinary manner; the
other end is fixed to a pin fixed in the circumference of the circular strap which
passes round the eccentric.
When the pedal is made to.revolve by the pressure of the foot or other motive
power, the other end of the crank revolves with the pin round the eccentric, and
the crank itself slides backwards and forwards with each revolution through the
perforated box or tube.
By this means the pedal itself is alternately drawn by the pin close up to the box,
and pushed further away from it, the length of stroke of the crank being
proportionately diminished or increased.
Balls or rollers may be inserted in the perforated box or tube to enable the crank
to slide backwards and forwards through it more easily, and they may also be placed
between the eccentric and the circular band which surrounds it.
This eccentric pedal gearing may be fitted to any bicycle or tricycle or any similar
or other machine where the power is applied with a rotary motion.
1000

page_text: I, HENRY THOMSON, of Buckden, in the County of Huntingdon, "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:-
My invention relates to a new or improved method of propelling bicycles, tricycles,
and other like vehicles.
I construct my invention, by placing to each outer side of the fork or bearing in
which the axle of the driving wheel of the machine runs, an eccentric is fixed rigidly
so that the axle passes through the eccentric, but does not carry it round with its own
revolution.
Outside of each eccentric the axle terminates in a perforated box or short tube fixed
rigidly upon it and revolving with it.
The pedal crank or lever passes through this box and is made so as to slide back-
wards and forwards through it.
Each eccentric is fitted with a circular band or strap of any suitable material fitting
closely upon it but so as to admit of its free revolution round the eccentric.
perforated strap is placed between the circular band and the eccentric, to regulate the
position of the ball bearings.
To one end of the crank or lever the pedal is fixed in the ordinary manner; the
other end is fixed to a pin fixed in the circumference of the circular strap which
passes round the eccentric.
When the pedal is made to revolve by the pressure of the foot or other motive.
power, the other end of the crank revolves with the pin round the eccentric, and
the crank itself slides backwards and forwards with each revolution through the
perforated box or tube.
By this means the pedal itself is alternately drawn by the pin close up to the box,
and pushed further away from it, the length of stroke of the crank being propor-
tionately diminished or increased.
Balls or rollers may be inserted in the perforated box or tube to enable the crank
to slide backwards and forwards through it more easily, and they may also be placed
between the eccentric and the circular band which surrounds it.
This eccentric pedal gearing may be fitted to any bicycle or tricycle, or any similar
or other machine where the power is applied with a rotary motion.
And in order that my invention may be thoroughly understood, I now
proceed to describe the accompanying drawings thereof, reference being had to letters
and figures marked thereon.
Figure 1, represents the side view of the propeller. The eccentric C is fixed to
the fork A, or other suitable bearing, the axle P passing through the fork or bearing A,

page_text: and through the driving wheel. The crank H slides in the sliding box E by the
grooves H running on the ball bearings J, which said balls are held secure by a
perforated box K. B or K has a pin M with a collar attached to travel in the
channel D as the eccentric strap revolves. The pin L is intended to revolve the
outer strap or band B on the ball bearings N which are held in position by a perfo-
rated strap B on the eccentric C. O denotes the hole where the balls are inserted
and secured by a stop plug. The dotted lines indicate portions of the apparatus not
appearing on the face.
Figure 2, is a front view of figure 1.
Figure 3, represents a section of crank with a double groove H¹ for the purpose of
being worked on a double row of ball bearings, and a part of the perforated box K
and the balls J.
Figure 4. denotes a section of the sliding crank H.
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:
First. The combination of the apparatus for regulating the crank H in the sliding
box E and revolved by means of a pedal, the said apparatus fixed to the fork crutch
or other bearings of any bicycle, tricycle, or the like, substantially as herein described
and according to the accompanying drawings.
Secondly. The combination of the apparatus with the crank H worked in the
slide box E, keyed up by F, to regulate the ball bearings J, and the perforated box K,
with the pin L to work the strap B on the eccentric C fixed to the fork or bearing A,
and worked by the pedal, substantially as herein described and according to the
accompanying drawings.
Thirdly. I claim that my invention is to enable a bicycle to gain more leverage
while the pedal is travelling a less radius, substantially as described.
Did this 10th day of March 1880