Improvements in Driving Gear for Cycles.
Year: 1897

page_text: Date of Application, 14th Jan., 1897
· Complété Specification Left, 14th Oct., '1897 - Accepted, 8th Jan.,
1898.
PROVISIONAL SPECIFICATION.
Improvements in Driving Gear for Cycles.
I, HARRY SYLVESTER, of 49, Liverpool Road, Newcastle-under-Lyme, Stafford-
shire, Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to driving gear for cycles, and according to my improve-
ments upon the hub or axle of the driving wheel I fix a pinion gearing with which
is a movable internally toothed rack frame of curvilinear shape. A roller is pro-
vided either secured to the frame of the machine or otherwise disposed and adapted
to bear against a flange either secured to, the said rack frame or carried on the
pedal lever with the object of keeping the curved rack always in gear with the
pinion during its travel. The rack frame is mounted on an extension of the pedal
lever and is free to rise and fall alternately therewith on the up and down strokes.
The pedal lever may be suspended upon the frame by a link or mounted with a
slot on a fixed pin or otherwise adapted to move or swing on or with the fulcrum
pin which is attached to the frame of the machine. The pedal levers are carried
forward for a suitable distance and are provided with pedals; or, by a modified
arrangement the gear may be made by placing the rack or teeth (provided with
anti-friction rollers is desired) in the middle part of the curved rack frame and
guiding the rack by a roller which in such cases would be placed on the axle.
The gear above referred to may be arranged on both sides of the driving wheel,
or on one side only, and is applicable equally for driving either the front or
rear wheel.
1
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af Tann
1807
HARRY SYLVESTER, 49 Liverpool Road, Newcastle-under-Lyme, Staffordshire.
Engineer does 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:
According to my Invention upon the Hub or Axle of the driving wheel I fix a
Pinion "A." Gearing with the said Pinion "A" is a curved rack
B" of a more
or less Curvilinear form. A Flange or Pad "C" is secured to the Frame of the
Machine, and bearing against the said Flange or Pad "C" is a Roller "D" which
is secured to the Rack "B" keeping the rack "B" in gear during its travel. Or

page_text: the Roller may be secured to the Frame of the Machine and bearing against the
Flange or Pad secured to the Rack. The Rack "B" is mounted on an extension
of the Pedal Lever "E" and is free to rise and fall alternately on the down stroke
and return therewith. The said Lever "E" is mounted with a Link or Slot "G"
or otherwise adapted to move on or with the Fulcrum Pin "H" which is attached
to the Frame of the Machine. The Pedal Levers are carried forward for a suitable
distance and are provided with Pedals. (See Fig. 1.)
This Gear may be made by placing the rack or teeth "K" (provided with anti-
friction Rollers if desired) in the middle of the curved rack "B" and guided by a
Roller "," then placed on the Axle: the said Roller "D" bearing against a
Flange "C," keeping the Rack "B" in Gear during its travel. (See Fig. 2.)
This Gear may be arranged by mounting the Pinion "A" on a Ratchet "L,"
when only a portion of the teeth of the Rack "B" will be used. The Rack "B"
and Lever "E" will then oscillate on the Fulcrum Pin H, and not move as
before. (See Fig. 3.)
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;
In driving Gear for Cycles, an oscillating Pedal Lever with toothed Rack.
engaging with a toothed Pinion attached to the Hub or Axle of the Driving
Wheel, and adapted to give to the said Driving Wheel a continuous Rotary
Motion: the whole substantially described and illustrated in the foregoing speci-
fication and drawings.
1000