IMPROVEMENTS IN THE MEANS FOR. TRANSMITTING OR IMPARTING ROTARY MOTION to be as follows
Year: 1885

page_text: We, EDGAR BRAY of Meanwood Road Leeds mechanic and JOHN HEALD of
Mansfield Holbeck near Leeds mechanic both in the County of York, do hereby
declare the nature of, said Invention for "IMPROVEMENTS IN THE MEANS FOR.
TRANSMITTING OR IMPARTING ROTARY MOTION to be as follows:-
"
The object of our Invention is to provide a silent simple and effective means for
transmitting or imparting rotary motion, and which is specially applicable, where
it is desired to transmit considerable power at very high speeds.
Our Improvements refer in particular to the means for gearing together or
transmitting.motion between two (or more) pullies or wheels. For this purpose
we provide on the rims of both wheels a series of rounded or otherwise suitably
shaped teeth, and over one of the wheels we pass a ring of india-rubber, woven
cotton, or other suitable elastic material. Both wheels are placed so close together,
that the india-rubber or other material enters to some extent the spaces or recesses
between the teeth, and when one of the wheels is rotated, the motion is imparted
or transmitted to the other.
For wheels with narrow rims we prefer a ring of india-rubber (or other elastic
material) having a circular section, the teeth of the wheels being shaped to
correspond. This arrangement permits us to gear together, wheels the axes of
which are more or less inclined to each other. Where the rims are broader, the
section of the india-rubber ring is more or less oval or rectangular, and the teeth
of the wheels are shaped to correspond. Or the broad rim of one of the wheels
may be provided with several rubber or elastic rings of comparitively small
circular section, the rims of both wheels being furnished with a corresponding
number of rows of suitably shaped teeth.
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Our Improvements are also applicable to transmitting motion between bevel or
mitre wheels, if the rims of such wheels are suitably bevelled, and the teeth
formed on the bevelled surfaces.

page_text: COMPLETE SPECIFICATION.
Improvements in the Means for Transmitting or Imparting
Rotary Motion.
r.
We EDGAR BRAY of 13 Alfred Cross Street, Meanwood Road Leeds mechanic
and JOHN HEALD of Mansfield Holbeck Leeds mechanic both in the County of
York do hereby declare the nature of our invention for IMPROVEMENTS IN THE
MEANS FOR TRANSMITTING OR IMPARTING ROTARY MOTION and in what manner
the same is to be performed, to be particularly described and ascertained in
and by the following statement :—
The object of our Improvements is to provided a silent, simple and effective
means for transmitting or imparting rotary motion, and which is specially
applicable where.it is desired to transmit considerable power at high speeds.
Our Improvements refer in particular to the means for gearing together or
transmitting motion between two or more pulleys or wheels. For this purpose we
provide on the rim of both wheels a series of rounded or other suitably shaped
teeth, and over one of the wheels we pass a ring of india-rubber, woven cotton or
other suitable elastic material. Both wheels are placed so close together that the
india-rubber or other material enters to some extent the space or recesses between
the teeth, and when one of the wheels is rotated the motion is imparted or trans-
mitted to the other.
For wheels with narrow rims we prefer a ring of india-rubber or other elastic
material having a circular section, the teeth of the wheels being shaped to
correspond. This arrangement permits us to gear together, wheels the axes of
which are more or less inclined to each other. Where the rims are broader, the
section of the india-rubber ring- we prefer is more or less oval or rectangular, and
the teeth of the wheels are shaped to correspond. Or the broad rim of one of the
wheels may be provided with several rubber or elastic rings of comparitively small
circular section, the rims of both wheels being furnished with a corresponding
number of rows of suitably shaped teeth.
Our Improvements are also applicable to transmitting motion between bevelled
or mitre wheels, if the rims of the wheels are suitably shaped and the teeth formed
thereon.
And in order that our Invention may be more completely and clearly under-
stood, reference is given to the accompanying drawings which shew various modes
of applying our Improvements; such Improvements however it will be evident
can be readily developed and applied to other arrangements of gearing than
those particularly described in this specification and shewn in the accompanying
drawings.
Figs. 1 and 2 are respectively part sectional elevation and plan of a pair of
wheels having a rubber band of rectangular section; and Figs. 1 and 3 shew &
narrower pair of wheels in which the rubber band is circular in section.
Fig. 4 is an elevation, part in section, of a pair of mitre wheels having a
flat rubber band between them. For many purposes in the case of bevel and
mitre wheels, it will be found more advisable to have the rubber, band circular

page_text: in section. In such a case, the hollows between the teeth are best formed in the
wheel or model of the wheel by means of circular revolving cutters. The use of
a thick rubber band circular in section is specially suitable in the case where our
Improvements are substituted for skew bevel wheels.
The right hand side of Fig. 5 shews the mode of driving a flat disc or plate
with teeth on the face, the teeth being preferably formed in a concave circular
groove by means of revolving cutters, or moulded. By carrying the hollows
between the teeth radially over the whole face of the disc or plate as shewn in the
left hand side of Fig. 5, this arrangement of pulley and disc can be made to give
any desired velocity ratio, by moving the rubber wheel nearer to or further from
the axis of the disc. The same end might also be attained by attaching a
flat rubber disc to the above mentioned metal disc, and provide teeth on the
wheel only.
If the corners of the teeth are smoothed and rounded off the rubber ring will
last a very long time without shewing any signs of wear. In order still further
to reduce any possibility of the wear of the rubber or elastic ring, we in special
cases cover the teeth with an enamel.
If the rubber band is sufficiently thin, and the space between the teeth some-
what wider than the thickness of a tooth, the wheels can then be run together
with an absolute velocity ratio, see Fig. 1. Even when the rubber ring is many
times thicker than the teeth, we find the velocity ratio for most purposes practically
constant.
Since in the case of thick rubber rings the teeth beneath serve merely to prevent
the rotation of the rubber ring, such teeth may in many cases be dispensed with,
the rubber ring being held merely by friction or by being fastened to the pulley.
Having now particularly described and ascertained the nature of our said
Invention and the manner in which the same is to be performed we declare that
what we claim is
The application of an elastic ring between wheels gearing with each other, one
or both of such wheels being provided with teeth or recesses substantially as and
for the purposes herein set forth, and as shewn in the accompanying drawing.
D
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