Improvements in Driving Gear applicable for Driving Tricycles or other Machinery.
Year: 1897

page_text: .
PROVISIONAL SPECIFICATION.
Improvements in Driving Gear applicable for Driving Tricycles
or other Machinery.
I, GEORGE HENRY BOND, 30, Lothair Road, Harringay, London, N., Clerk, do
hereby declare the nature of this invention to be as follows:
--
This invention relates to improvements in driving gear for tricycles and the
like, the objects being to so construct and arrange the driving pedal cranks, that
the longest leverage will be obtained when the crank is in its most operative
position and the same is carried out as follows:-
I employ a crank, which is so constructed and arranged as to have an adjustable
axis of rotation around which the crank revolves. The crank is connected to the
wheel or the like to be driven through the medium of a rod or lever which slides
in a guide or bearing secured to the wheel or the like to be driven. The centres of
rotation of the crank and wheel or axle to be driven differ so as to give a varying
operative length of the aforesaid lever or rod; the parts being so arranged that the
operative length of the lever or rod is at its greatest length when the greatest power
is required and at its shortest length when the minimum power is required.
Although I have described my invention applied to a tricycle it will be seen that
there are other driving purposes to which my invention may be applied in which
differential power is required, said differential power being obtained by means of
a crank having different rotating and driving centres.
If desired I may secure the rod or lever aforesaid to the wheel or the like to be
driven and connect same to the driving crank by means of the guide or bearing
aforesaid.
021
1
1 1000
E. EATON,
Agent for Applicant.
Improvements in Driving Gear applicable for Driving Tricycles
or other Machinery.
I, GEORGE HENRY BOND, 30, Lothair Road, Harringay, N., Clerk, do hereby
declare the nature of this invention, and in what manner the same is to be per-
[Price 8d.]

page_text: formed, to be particularly described and ascertained in and by the following
statement:-
This invention relates to improvements in driving gear for tricycles and the like,
the object being to so construct and arrange the driving pedal cranks that the
longest leverage will be obtained when the crank is in its most operative position,
and the same is carried out as follows:-
I employ a crank which is so constructed and arranged as to have an adjustable
axis of rotation around which the crank revolves. The crank is connected to the
wheel or the like to be driven through the medium of a rod or lever which slides in
a guide or bearing secured to the wheel or the like to be driven. The centres of
rotation of the crank and wheel or axle to be driven differ so as to give a varying
operative length of the aforesaid lever or rod, the parts being so arranged that the
operative length of the lever or rod is at its greatest length when the greatest power
is required and at its shortest length when the minimum power is required.
Although I have described my invention applied to a bicycle, it will be seen that
there are other driving purposes to which my invention may be applied in which
differential power is required, said differential power being obtained by means of
a crank having different. rotating and driving centres.
If desired I may secure the rod or lever aforesaid to the wheel or the like to be
driven and connect same to the driving crank by means of the guide or bearing
aforesaid.
In order that my invention may be fully understood, I will now refer to the
annexed drawing, in which: :―
Figure 1, is a side elevation to enlarged scale shewing the driving wheel of a
velocipede to which my invention is attached.
Figure 2, side elevation shewing my invention in position.
Figure 3, plan view of same.
a is a rod which slides in the bearing b attached to the driving wheel c. This
bearing may be provided with balls or rollers for the purpose of reducing friction
between the working surfaces of same and the rod a. The end of this rod is
secured to the driving pedal e, which is in turn carried by the pivoted lever f.
This pivoted lever f being secured in the required position in the slotted bar or
frame by means of the spindle h and nut i. By this arrangement it will be
seen that the relative positions of the centres of rotation of the driving wheel c
and the lever f may be varied.
In Figure 3 the crank is shewn at its greatest distance from the centre of the
driving wheel c, and it will be seen that when a half turn is given to the crank it
will then be at the least distance from the centre of the driving wheel c. In the
case of a machine where two cranks are used, such as an ordinary tricycle, the
parts are so arranged that one pedal will be at the greatest distance from the centre
of the driving wheel c when the other pedal is at the least distance from the centre
of the driving wheel c. It will be seen that this action is obtained owing to the
rod a sliding in the bearing b carried by the driving wheel c.
In Figure 1 the screws jare for the purpose of adjusting the amount of play
of the rod a in the bearing b, and when required I may interpose caps or carriers,
between which and the rod a the antifriction balls or bearings may be placed for
the purpose of reducing friction between the working parts.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is-
1. In driving gear for tricycles and the like: an adjustably pivoted lever carrying
the driving pedal, said driving pedal being connected to a bar sliding in suitable
bearings upon a driving wheel, the relative positions of the centres of the pivoted
lever and driving wheel being so arranged that the movement of the sliding bar
will cause the driving pedal to approach or recede from the axis of rotation of the

page_text: driving wheel according to its position, thus giving a shorter or longer leverage
upon said driving wheel.
Dated th: 02-33
1007
E. EATON,
Agent for Applicant.