Improvements in and relating to Driving Gear for Cycles and the like.
Year: 1898

page_text: Date of Application, 3rd Mar., 1898-Accepted, 4th June, 1898
COMPLETE SPECIFICATION.
Improvements in and relating to Driving Gear for Cycles and the
like.
I, CARL GUSTAV IRENAUS SCHULTZ, Merchant, of 8, Pelzerstrasse, Hamburg, in
the Empire of Germany, 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: -
This invention relates to an improved gear for operating the rear or driving
wheel of cycles or like vehicles, and its object is to provide a positive gear having
a minimum amount of friction and therefore a high efficiency.
The invention consists generally in providing a special form of roller teeth
coned gear wheels upon a transmission shaft carried from the pedal axle to the rear
or driving wheel, and this arrangement forms an improved substitute for the
ordinary chain drive or positive shaft drive with cone gearing of ordinary construc-
tion.
A mode of carrying the invention into effect is illustrated in the accompanying
sheet of drawings as follows,
Figures 1 and 2 are respectively side elevation and plan of the improved gearing
applied to a bicycle.
Figures 3, 4, 5, and 6 are details on an enlarged scale of the improved roller
conical wheels which form the principal portion of the gearing.
Referring to the accompanying drawings:-The pedal axle K of the bicycle is
of the usual construction and it has mounted upon it a bevel wheel k with solid
teeth whose surface and pitch are arranged to intermesh with the special roller gear
wheel hereafter to be described. A similarly constructed gear wheel is attached
to the rear or driving wheel of the bicycle, and a shaft a is mounted in bearings s s¹
which attach it to the lower members of the frame of the cycle. This shaft « is
arranged in the position shown clearly in plan, and carries upon its extremities
two roller gear wheels cc which intermesh with their respective gear wheels kk.
The construction of the bevel roller gear wheels c c¹ is clearly shown in detail
in Figures 3, 4, 5, and 6. A number of conical rollers f Figure 5 corresponding to
the teeth in the wheels with which they gear are constructed with their ends fi f
turned down to form tenons. These rollers are mounted with their ends in two
discs and keyed to the shaft a at the proper distance apart and these discs have
corresponding bearings drilled in them to receive the ends f¹ f. As a means for
replacing any of the rollers f when worn or injured it is preferred to construct
one of the discs such as i in two concentric sections. The parting of the two
concentric rings being on the centre line of the bearings in which the ends f¹ of
the rollers rotate. The outer concentric ring is illustrated at Figure 6 and it can
be firmly attached in its place by set screws such as m.
The operation of the herein before described mechanism is evident, the rotation
of the shaft K transmits the motion through the gear wheels kc and shaft a to the
gear wheels c¹ and k¹ and owing to the special construction of the roller wheels c

page_text: and and the corresponding surfaces of the respective gear wheels k¹ the friction
is reduced to a minimum and the efficiency of the cycle thereby increased.
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 cycles or like vehicles in which the motion is transmitted through a shaft
by suitable bevel gearing arranging pairs of bevel gear wheels on either end of the
shaft and providing one wheel of each pair with roller teeth as a means for reducing
friction substantially as herein before described.
f
2. The improved driving gear for cycles herein before described with reference ]
to Figures 1 and 2 of the accompanying drawings.
3. The improved roller bevel gear wheel for cycles hereinbefore described with
reference to Figures 3, 4, 5 and 6 of the accompanying drawings.
.
1000
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.