Improvements in Gearing for Cycles.
Year: 1894

page_text: Date of Application. 21st May, 1894
Complete Specification Left, 21st Feb. 1895-Accepted, 27th Apr., 1895
Improvements in Gearing for Cycles.
1, PATRICK FITZPATRICK of 7 Anglesea Terrace, Cork, County Cork, Ireland,
Machimist, do hereby declare the nature of this invention to be as follows:-
This invention relates to the driving gear for cycles particularly safety bicycles
and has for its object to enable the machine to be geared up high without the
necessity for employing an excessively large chain wheel upon the driving axle.
To effect this I introduce an intermediate axle and drive this by chain gearing in
the ordinary manner from the crank axle and then I drive the road wheel from the
intermediate axle by another chain and appropriate wheels. I prefer to drive
the intermediate axle faster than the crank axle and the road wheel faster than the
intermediate axle. The intermediate axle may conveniently be placed in the
opening of the diamond frame somewhere under the saddle the bearing being so
arranged preferably with screws or other equivalent devices as to allow for the
A convenient means for
necessary adjustment of the chains when they wear.
carrying this into effect is to provide a suitable bracket with ball bearings through
which the axle carrying the large and small chain wheels passes the bracket fitting
upon a suitable projecting tube or equivalent preferably having feathers or the like
at the sides to hold the bracket from turning and one or more set screws or
equivalent by which the bracket may be clamped upon the support in the proper
position. If preferred, the two chain wheels of the intermediate axle may be
formed together and run upon a fixed stud or pin which may be adjusted' as
required.
Where it is desired to gear up very high two intermediate axles and three chains
and wheels may be employed.
In the case of a tricycle the exact arrangement would naturally be made to follow
the design of the framing, but where the crank axle is carried upon a depending
tube the intermediate axle may be secured by a suitable bracket or equivalent to
the tube higher up the first chain going from the crank axle to the intermediate
axle and the second from the intermediate axle to the axle which carries or drives
the road wheels.
Doted this Qth day of June 1894.
W. P. THOMPSON & BOULT,
Agents for the Applicant.
Improvements in Gearing for cycles.
I, PATRICK FITZPATRICK, of 7 Anglesea Terrace, Cork, County Cork, Irelanit,
Machinist, 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 the driving gear for cycles particularly safety bicyclės

page_text: and has for its object to enable the machine to be geared up high without the
necessity for employing an excessively large chain wheel upon the driving axle.
The invention will be best understood by reference to the accompanying drawings
in which :-
Fig. 1 is a side elevation of a safety bicycle with my improvements applied
thereto.
Fig. 2 is a horizontal section on line 2-2 of Fig. 1, but drawn to a larger scale
than Fig. 1 and
Fig. 3 is a side elevation showing a modified arrangement of the gear.
Like letters indicate like parts throughout the drawings.
In carrying my invention into effect I introduce an intermediate axle A and
drive this by a chain B and chain wheels A' and C in the ordinary manner from
the crank axle C and then I drive the road wheel D from the intermediate axle A
by another chain E and appropriate wheels A and D'. I prefer to drive the
intermediate axle A faster than the crank axle C¹ and the road wheel D faster
than the intermediate axle. The intermediate axle A may conveniently be placed
in the opening F¹ of the diamond frame F somewhere under the saddle G the
bearing H Fig. 2 being so arranged preferably with screws or other equivalent
devices H' as to allow for the necessary adjustment of the chains B and E when
they wear. A convenient means for carrying this into effect is to provide a suitable
bracket H with ball bearings H2 through which the axle A carrying the small and
large chain wheels A¹ A passes, the bracket fitting directly upon the diagonal F
as shown in Fig. 1 preferably having one or more feathers or the like F to hold
the bracket H from turning and one or more set screws or equivalent H' by which
the bracket may be clamped upon the support F2 in the proper position.
The diagonal F2 may be strengthened at the part at which the bracket H
(or 11 hereinafter described) is applied, by a suitable lining.
In Fig. 21 have represented the two chain wheels A¹ A' as secured upon the
opposite ends of the axle A; with this arrangement the chains B and E would be
at opposite sides of the frame F, if preferred however the two chain wheels A' A'
of the intermediate axle A may both be secured upon the same end of the axle A
the chains B and I and the chain wheels C and D being then all at the same side
of the frame F.
Should it be desired to change the gear from a high to a low one a second pinion
may be provided on the axle of the road wheel D in line with the wheel C and the
chain B removed, the chain E being passed around both the wheel C and this
second pinion; the axles A and C are arranged at about equal distances from the
axle of the road wheel D to facilitate this changing of gear.
Instead of mounting the bearing bracket H directly upon the diagonal F³ in the
manner shown in Figs. 1 and 2, I may secure it on an arm such as I Fig. 3
adjustably mounted and capable of being secured, as by screws, in_any_desired
position on the diagonal F3. For adjusting the tension of the chains B and E the
positions of the bracket H on the arm I and of the arm I on the diagonal F³
may be altered.
Where it is desired to gear up very high, two intermediate axles A A³ and
three chains B J and E and altogether four intermediate wheels A' A' A* A³ may
be employed as shown in Fig. 3. In this arrangement the bearing of the axle Å
may be adjustably supported on the arm I and the bearing of the axle A³ on the
arm I which may be integral with the arm I so as to form a two-armed bracket,
itself adjustable as above described on the diagonal F for chain-tensioning
purposes.
In the case of a tricycle the exact arrangement would naturally be made to follow
the design of the framing, but where the crank axle is carried upon a depending
tube the intermediate axle may be secured by a suitable bracket or equivalent to
the tube higher up, the first chain going from the crank axle to the intermediate
axle and the second from the intermediate axle to the axle which carries or drives
the road wheels.

page_text: Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that
what I claim is :-
1. In a cycle the combination with the chain wheels on the crank axle and road
wheel and one or more intermediate or additional axles chain wheels and chains
gearing them together of a bracket such as I or I¹ for supporting the intermediate
axles adjustably secured on the diagonal F substantially as and for the purpose
described and illustrated in the accompanying drawings.
2. In a cycle the combination with the crank axle and the driving road-wheel of
an intermediate axle and chain wheels such as A A A carried in a bracket
adjustably secured upon the diagonal F2 of the machine substantially as and for the
purpose described and illustrated in the accompanying drawings.
3. In a cycle the combination with the crank axle and the driving road wheel of
one or more intermediate chain wheels adjustable upon the diagonal F.
4. In a cycle in which intermediate chain wheels are employed between the
crank axle and the driving road wheel the arrangement whereby it is possible when
desired to drive direct by one chain substantially as described.
5. The combination and arrangement of parts constituting the complete cycle
driving gear substantially as described and illustrated in Figure 1 of the
accompanying drawings.
6. The combination and arrangement of parts constituting the complete cycle
driving gear substantially as described and illustrated in Figure 3 of the
accompanying drawings.
Dated th01 1
1005
BOULT & WADE,
Agents for the Applicant.