Year: 1897

page_text: I, HARRY PINNINGTON HALLOWs, of 41 Hall Gate, Doncaster, in the County of
Yorks, Doctor of Medicine, do hereby declare the nature of this invention to be.
as follows:-
My invention has for its object improved mechanism for gearing the pedal crank.
axle to the hub of the driving wheel of a safety bicycle and for other like purposes.
This I construct of a shaft, either solid or hollow, mounted in suitable bearings
attached to the frame of the cycle so that it extends from the one to the other of
the two parts to be coupled.
On each end of the shaft is secured a worm wheel through it, having each of its
teeth in the form of a short screw thread, one of which gears with a worm wheel
on the pedal crank axle and the other with a worm wheel on the hub of the driving
wheel of the cycle.
Each of the pair of worm wheels gearing together are arranged with their edges
or peripheries at right angles the one to the other, and those on the shaft are
preferably situated above those on the pedal crank axle and hub of driving wheel
respectively.
I, HARRY PINNINGTON HALLOWS, of 41 Hall Gate, Doncaster, in the County of
Yorks, Doctor of Medicine, 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 has for its object improved mechanism for gearing the pedal crank
axle to the hub of the driving wheel of a safety bicycle and for other like purposes.
This I construct of a shaft, either solid or hollow, mounted in suitable bearings
attached to the frame of the cycle so that it extends from the one to the other of
the two parts to be coupled.
On each end of the shaft is secured a worm wheel, having each of its teeth in
the form of a short screw thread, one of which gears with a worm wheel on the

page_text: pedal crank axle and the other with a worm wheel on the hub of the driving wheel
of the cycle.
Each of the pair of worm wheels gearing together are arranged with their edges
or peripheries at right angles the one to the other, and those on the shaft are
preferably situated above those on the pedal crank axle and hub of driving wheel
respectively.
In order that my invention may be more readily carried into effect I will now
describe it in connection with the accompanying sheet of drawings of which Fig. 1
is a side elevation of the back wheel of a safety bicycle having the driving
mechanism attached thereto, and Fig. 2 is a front elevation of Fig. 1, the same
letters indicating similar parts in both the Figs. a represents a solid or hollow
shaft mounted in ball bearings b, b, attached to the frame c of the bicycle, and
having secured in any convenient manner at one end thereof, a worm wheel f
and at the other end thereof a worm wheel f¹, the worm wheel gearing with a
worm wheel g fixed in any suitable manner to the pedal crank axle h, and the
worm wheel f¹ gearing with a worm wheel g', fixed in any suitable manner to the
hub of the bicycle wheel n. The worm wheels f and fl having their peripheries
arranged at right angles to the peripheries of the worm wheels g and g¹ respectively.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:-
An improved driving mechanism for velocipedes consisting of a shaft revolving
in ball bearings attached to the velocipede frame and having fixed to either end
thereof a worm wheel, one of which gears with a worm wheel fixed to the pedal crank
axle, and the other of which gears with a worm wheel fixed to the hub of the
driving wheel, substantially as herein described and illustrated in the accompanying
drawings.
CASTLE SMITH,
"Invention" Office, Mitre Court, Fleet Street, London, E.C.,
Agent for the Applicant.