Improvements in wearing forces.
Year: 1897

page_text: I, JOHN GEORGE AULSEBROOK KITCHEN of 44 Albert Road, Alexandra Park,
Manchester in the County of Lancaster, Engineer do hereby declare the nature of
this invention to be as follows:-
-
This invention relates to improvements in rotary driving gear in which
motion is transmitted from the crank axle or first motion shaft to the driven
axle through suitably formed gear wheels by means of an endless row of separate
bodies in contact with each other carried in a duct or guide and sliding or rotating
therein, and its object is chiefly to obtain greater freedom of running.
According to this invention the duct or guide is so arranged as not to pass round
the gear wheels but only to come in contact with them at the junction of the duct
with each gear wheel tangentially. The duct from the pitch circle of one gear
wheel to that of the other tangentially follows a curve of suitable dimensions and
return path to the periphery of the first gear wheel.
The moving bodies are preferably hardened steel balls but in some cases' máy bé'
suitably formed rollers or cylindrical blocks.
When steel balls are used the ring of the pitch wheels are bored radially with
round holes having concave bottom of suitable size to contain each a ball and the
borings are opened one into the other so that the bodies therein shall bear one.
against the other.
..
In some cases freely mounted guide wheels or rollers are placed on the opposite
sides of the row of moving bodies where it comes in contact with the wheels."
I sometimes used two sizes of balls in the row arranged alternately.
The duct is preferably made in two parts so arranged that longitudinal adjust-
ment can be readily obtained to compensate for wear of the moving bodies.
7007
y
R. J. URQUHART
57, Barton Arcade, Manchester.
6, Clayton Square, Liverpool.
Consulting Engineer & Patent Agent.
Improvements in wearing forces.
I, JOHN GEORGE AULSEBROOK KITCHEN of 44, Albert Road, Alexandra Park,..
Manchester in the County of Lancaster, Engineer, do hereby declare the nature of
Dune R71
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page_text: 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 improvements in rotary driving gear in which motion
is transmitted from the crank axle or first motion shaft to the driven axle through
suitably formed gear wheels by means of an endless row of separate bodies in con-
tact with each other carried in a duct or guide and sliding or rolling therein, and
its object is chiefly to obtain greater freedom of running.
In the driving gear of this kind previously made the duct or guide was carried
round the gear wheels, so that the driving bodies, usually bails, had to pass
round the wheels. According to this invention, the duct or guide is so arranged
as not to pass round the gear wheels but only to be in contact with them
tangentially at the junction of the duct with each gear. wheel. The tangential
duct from the pitch circle of one gear wheel to that of the other is straight and
then follows a curve of suitable dimensions and return path to the periphery of
the first gear wheel.
The moving bodies are preferably hardened steel balls but in some cases may be
suitably formed rollers.or cylindrical blocks.
When steel balls are used, the rims of the pitch wheels are bored radially with
round holes, having concave bottoms, of suitable size to contain each a ball and
the borings are opened one into the other so that the bodies therein shall bear
one against the other.
i
In some cases freely mounted guide wheels or rollers are placed on the opposite
sides of the row of moving bodies where it comes in contact with the wheels.
sometimes use two sizes of balls in the row arranged alternately.
The duct is preferably so made that longitudinal adjustment can be readily
obtained to compensate for wear of the moving bodies.
:
On the drawing appended hereunto
Fig. 1 shows a side view partly in section of the driving and driven wheel and
duct arranged for transmitting the power by an endless row of balls.
Figure 2 shows a part of the circumference of the driving wheel straightened out.
Figure 3, the arrangement of a guide wheel in partial section;
Figure 4, a cross section of the same;
Figure 5, the arrangement of the wheel when balls of different sizes are used,
in partial section.
Referring to Figure 1, a represents the driving wheel and the driven wheel of
a velocipede. The duct c for the balls d is placed so that its centre line is
tangential to the pitch lines of the wheels, which preferably coincide with their
outside diameters, the duct being cut out for the wheels to fit into the recess, as
shewn. The circumference of the wheels is bored radially with round holes e,
having preferably concave bottoms, of suitable size to contain each a ball d, and
the middle part of the wheel rim is recessed so that the balls & bear against
each other. The bottom of the holes may be conically countersunk instead of
being concave. Beyond the wheel the duct forms a curve c² and returns to the
wheel a with another curve 2. Where possible the duct is so placed that it lies
in a horizontal plane, but where this cannot be done, it may be placed vertically
as shewn. It is supported by suitable brackets f attached to any convenient
part of the frame. The duct is divided at one of the curved ends, and a packing
piece placed between the flanges and c³, of the joint, so that by thinning the
packing piece the length of the duct can be varied and the balls brought into
close contact all round. Equivalent suitable devices may be used for this purpose.
The duct is in all cases so placed relatively to the wheels, that the driving
power is transmitted through the balls moving on a straight path only, for instance
in a rear driving. safety bicycle underneath the wheels as shewn, so
the balls move through the curved parts of the duct without transmitting power
and consequently with little friction. This has the further advantage that in
back-pedalling, when the wheel has to drive the wheel a and pedals, the rotation
that

page_text: is transmitted by the balls through the curved ends of the duct with increased fric-
tion, the arrrangement acting partly as a brake and easing the back pedalling.
In some cases a guide or anti-friction wheel g turning freely in the bearings of
its spindle may be arranged at the point where the duct comes into contact with
the gear wheel, as shewn on Figure 3, which wheel g is formed with holes on its
circumference in the same manner as the gear wheels and receives the balls while
they act on the wheel or are acted on by the same, whereby the rolling friction of
the balls is obviated.
In some cases balls of alternately differing sizes may be used as shewn on
Figure 5, the pitch of the holes in the gear wheels being made to correspond with
the pitch of the larger balls.
Instead of balls, rollers or cylindrical blocks may may be used, the duct being
in that case made restangular in section and the wheels formed with transverse
semi-cylindrical grooves on their circumference.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I claim
is:
1. In rotary driving gear for velocipedes in which motion is transmitted by
means of an endless row of balls or their equivalent engaging into gear wheels,
the arrangement of the duct for said balls or their equivalent so that its centre
line comes only into tangential contact with the pitchlines of the gear wheels and
the driving power is transmitted through a straight row of balls or their equivalent
substantially as herein before described, and illustrated by the drawings.
2. In combination with the arrangement of the driving gear and duct as claimed
in the preceding claim, the arrangement of guide or anti-friction wheels sub-
stantially as herein before described and illustrated with reference to Figure 3 of
the drawings.
R. J. URQUHART
57, Barton Arcade, Manchester..
Consulting Engineer & Patent Agent.