Improvements in Change Gear for Velocipedes.
Year: 1895

page_text: Date of Application, 21st Sept., 1895
Complete Specification Left, 18th June, 1896-Accepted, 25th July, 1896
PROVISIONAL SPECIFICATION.
Improvements in Change Gear for Velocipedes.
1, JOHN JOHNSON, of Quorn, in the County of Newcastle, Province of South
Australia, Mechanic, do hereby declare the nature of this invention to be as
ollows:-
My invention relates to gear for propelling velocipedes, the special object which
I have in view being to apply change gear in such a manner that the rider can adapt
the power to the nature of the ground over which he travels so that he can exert his
energy to the best advantage. For this purpose, I provide several toothed wheels of
various diameters, and a clutching device whereby one or other of the sets of wheels
may be geared together as I shall describe referring to the accompanying drawings.
Fig. 1 is a side elevation of one form of velocipede.
Fig. 2 is a vertical section of the gearing.
Fig. 3 is a side view of the parts for working the clutch.
Fig. 4 is a front view of the head of the clutch rod.
Fig. 5 is a front view of the catch.
In
Throughout the drawings similar letters of reference are used to denote similar
parts.
A is the main frame to which is attached a frame B carrying the change gear.
this frame is mounted the pedal axle C and a countershaft D. On the axle is fixed
a toothed wheel E which gears with a pinion F fixed on the shaft D. Free on the
axle C is a sleeve G on which are fixed two toothed wheels g and g' of different
diameters and the chain wheel H. On feathers on the shaft D is fitted free to slide a
sleeve K having fixed on it two wheels kk' adapted to gear with g and g¹ respectively.
The sleeve K can be moved to the one side or the other by a fork L on a spindle M
which extends upwards, terminating in a fork having a prong on each side of the
On this lever is a ring m¹ and a
frame tube A, and having jointed to it a lever m.
spring catch N which can engage with any one of three notches on the underside of
a barn carried on the tube A. When the catch is engaged in the middle notch
neither of the wheels kk is engaged with g or g' consequently the chain wheel H is
not driven.
The rider by taking hold of the ring m¹ and depressing the catch N so as to
disengage it from the notch in u can move the lever m to the right or left thus moving
the sleeve K and bringing the one or the other of the wheels kk into gear
with
g or g'. The chain wheel H is then driven, the motion of the pedal axle C
being transmitted through E, F the sleeves K k or k¹, g or g' and the sleeve G. As
5 the pairs of wheels kg and k¹ g¹ differ in proportion so the rider by bringing the one
pair or the other into gear can vary the speed of the chain wheel and can thus adapt
his power to the nature of the ground over which he travels. A ratchet and paw
may be arranged at P for driving the wheel E in one direction only, leaving it free
to turn partly round the axle C when the gearing is changed.
0
Dated this 21st day of September 1895.
ADEL & IMRAY,
Agents for the Applicant.

page_text: QUALI LEIE SIECIFICATION.
Improvements in Change Gear for Velocipedes.
I, JOHN JOHNSON of Quorn, in the County of Newcastle, Province of South
Australia, Mechanic, 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 relates to gear for propelling velocipedes, the special object which
I have in view being to apply change gear in such a manner that the rider can
adapt the power to the nature of the ground over which he travels so that he
can exert his energy to the best advantage. For this purpose, I provido several
toothed wheels of various diameters, and a clutching device whereby one or other
of the sets of wheels may be geared together as I shall describe referring to the
drawings accompanying my Provisional Specification.
Fig. 1 is a side elevation of one form of velocipede.
Fig. 2 is a vertical section of the gearing.
Fig. 3 is a side view of the parts for working the clutch.
Fig. 4 is a front view of the head of the clutch rod.
Fig. 5 is a front view of the catch.
Throughout the drawings similar letters of reference are used to denote similar parts.
A is the main frame to which is attached a frame B carrying the change gear.
In this frame is mounted the pedal axle C and a countershaft D. On the
axle C is fixed a toothed wheel E which gears with a pinion F fixed on the
..shaft D. Free on the axle C is a sleeve G on which are fixed two toothed
wheels and g of different diameters and the chain wheel H. On feathers on
the shaft D is fitted free to slide a sleeve K having fixed on it two wheels k k¹
adapted to gear with 9 and g' respectively.
g
The sleeve K can be moved to the one side or the other by a fork L on a
spindle M which extends upwards terminating in a fork having a prong on each
side of the frane tube A, and having jointed to it a lever m. On this lever is
a ring m² and a spring catch N which can engage with any one of three notches
on the underside of a bar n carried on the tube A. When the catch is engaged
in the middle notch neither of the wheels kk' is engaged with g or g¹ consequently
the chain wheel H is not driven.
The rider by taking hold of the ring m¹ and depressing the catch N so as to
disengage it from the notch in u can move the lever m to the right or left thus
moving the sleeve K and bringing the one or the other of the wheels kk' into
gear with g or g'.
The chain wheel H is then driven the motion of the pedal
axle being transmitted through E, F the sleeves Kk or k¹, g or g¹ and the
sleeve G. As the pairs of wheels kg and k¹ g¹ differ in proportion so the rider
1 by bringing the one pair or the other into gear can vary the speed of the chain
wheel and can thus adapt his power to the nature of the ground over which he
travels. A ratchet and pawl may be arranged at P for driving the wheel E in
one direction only, leaving it free to turn partly round the axle C when the
:.gearing is changed.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
-claim is :-
•
Change gear for a velocipede arranged and operating substantially as described
with reference to the accompanying drawings.
Dated this 18th day of June 1896
ABEL & IMRAY,
Agents for the Applicant.