Improvements in or relating to the Driving Gear of Cycles.
Year: 1897

page_text: Date of Application, 3rd July, 1897-Accepted, 30th Oct., 1897
COMPLETE SPECIFICATION.
Improvements in or relating to the Driving Gear of Cycles.
I, OSCAR LUTHER of 10 Wilhelmithor-Promenade, Brunswick, in the Empire
of Germany, Engineer, 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 a device for securing the chain wheels and ball-cups on
the hub of the driving wheels of cycles provided with two speed gear chain wheels.
The object of this is to reduce the bore in the chain-wheel, for the passage of
the axle in order to obtain greater stability.
In the accompanying drawings,
Figs. 1 and 2 show two constructions in sectional elevation.
The invention consists chiefly in detachably arranging the ball-cups 34 and 35
carrying the chain wheels 1 and 2 one of which is thrown in or out of gear as
desired, said ball-cups being passed over the spindle 5 and secured to the inner
wall of the ends of the hubs of the driving wheel by means of right and left hand
screw threads 36 and 37.
The flanges 38 on the ball-cups 34 and 35 engage with corresponding recesses
on the chain wheels 1 and 2 which receive the flanges 41 of the hub 7 into their
recess 40 arranged on the opposite side to the recess 39.
The flanges 41 of the hub 7 are connected with the rings 43 on the hub 7, carry-
ing the spokes by means of sleeves, which sleeves 42 assist in guiding the locking
pins 11.
While the arrangement just described and illustrated in Fig. 1 is intended for
locking devices placed outside the hub 7 the arrangement now to be described and
illustrated in Fig. 2 is designed for locking devices to be placed within the hollow
hub.
In this case the cups 34 and 35 are also screwed in by means of right and left
hand screws.
Similarly to the first arrangement, the chain-wheels 1 and 2 are in this case also
provided with recesses 39 and 40 with which engage the flanges 44 of the ball
cups 34 and 35 and the flanges 45 of the hub 7 so that the chain wheels are suitably
guided.
In order to enable the parts transmitting the engaging or disengaging motion
to the locking parts to be easily introduced into the hollow hub 7, one front
wall 46 of the latter is detachably secured as shown in Figure 2 on the right-hand
side.
The detachable securing of this side 46 of the hub as well as the detachable con-
nection of the ball-cups 34 and 35 may be effected also in any other manner than
by screwing, for instance by means of keys, clamps locking joints etc.
By means of the described detachable arrangement of the ball-cups 34 and 35
the holes in the chain wheels 1 and 2 for receiving the spindle can be considerably
reduced, viz.: more than the diameter of the ball-bearing itself whereby consider-
ably increased stability of the driving gear is obtained.

page_text: In order that the invention may be better understood the operation of the two
speed gear will be explained with reference to Figure 1.
When the cord shown on the right side passing over a roller, is pulled in the
direction of the arrow the central pin 52 which is connected thereto
and is horizontally movable and which is constantly kept in its out-
ward position shown by means of the spiral spring 53 is moved
towards the left. A cross key connected with this pin and passing through
longitudinal slots in the hollow axle acts on a horizontally movable
double sleeve. The loose half 50 of this double sleeve is securely connected
by means of a transverse pin 51 which passes through a longitudinal slot in the
wall of the hub with the sleeve 54 carrying the coupling pins 11 and 'movable on
the hub of the wheel. The pins 11 are thereby also moved towards the left and
effect the coupling of the driving wheel and the uncoupling of the wheel 2. On
releasing the cord the parts which it has moved return to the position shown in
the drawing.
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 variable speed gear for cycles detachable ball cups as 34 and 35 arranged
on the hollow hub 7 for the purpose of enabling the chain-wheels loose on the ball-
cups to be provided with smaller holes for the central spindle substantially as
described.
2. The combination and arrangement of parts constituting the complete bear-
ing for cycles substantially as described and illustrated in Figure 1 or in
Figure 2 of the accompanying drawings.
Date : 91 of T.... 100%
BOULT & WADE,
Agents for the Applicant.