IMPROVEMENTS IN MEANS OR APPARATUS FOR TRANSMITTING MOTIVE-POWER, SUCH IMPROVEMENTS BEING SPECIALLY APPLICABLE TO THE LIGHTER CLASS OF MACHINES, SUCH AS VELOCIPEDES AND LAWN MOWERS."
Year: 1881

page_text: LETTERS PATENT to John Aylward, of Birmingham, in the County of
Warwick, Manufacturer, for an Invention of "IMPROVEMENTS IN MEANS OR
APPARATUS FOR TRANSMITTING MOTIVE-POWER, SUCH IMPROVEMENTS BEING
SPECIALLY APPLICABLE TO THE LIGHTER CLASS OF MACHINES, SUCH AS
VELOCIPEDES AND LAWN MOWERS."
PROVISIONAL SPECIFICATION left by the said John Aylward at the Office
of the Commissioners of Patents on the 1st June 1881.
JOHN AYLWARD, of Birminghamn, in the County of Warwick, Manufacturer.
"IMPROVEMENTS IN MEANS OR APPARATUS FOR TRANSMITTING MOTIVE-POWER,
SUCH IMPROVEMENTS BEING SPECIALLY APPLICABLE TO THE LIGHTER CLASS OF
MACHINES, SUCH AS VELOCIPEDES AND LAWN MOWERS."
The object of this Invention is to obtain in an arrangement of pitched band or
chain and pitched pullies, in which the band or chain works in conjunction with
the pullies so as to give motion from one pulley to another, the advantage of
certainty in action, though the pullies may get somewhat out of line with one
another, and also of casy manufacture. and application, and of presenting &
tolerably plain exterior surface where such is exposed.
To a metal or leather or other band, or to a flat chain, which passes around any
two pullies, one of which is used to give motion to the other, and on the side of
such band or chain which works next to the pullies, and at suitable distance apart
lengthways of the band or chain, I rivet cross-pieces of metal or other hard
substance, shaped as two half frustra of cones having a common axis, and joined
together at their smaller ends, preferably by a short semi-cylindrical piece of the
same diameter as the smaller ends of the frustra. The axis of each pair of cone-
frustra lies across at right angles to the length of the band or chain, each cross-
piece extending preferably across the entire width of the band or chain. The
back or flat part of each cross-piece bears or beds against the band or chain. The
peripheries of the pullies are formed preferably to the width of the band or chain,
and recesses corresponding to the cross-pieces aforesaid, both in shape and distancē

page_text: apart, are sunk at intervals around the periphery of each pulley to receive the said
cross-pieces. Power is conveyed from one pulley to the other through the medium
of the cross-pieces gearing into the recesses. The double conical shape of the
cross-pieces and corresponding recesses tends to draw them into proper gear when
the pullies are out of line with one another in either direction. The cross-pieces
and pullies may be readily manufactured by being moulded and cast, though they
may be made in any other suitable manner if preferred. The outer surface of the
band or chain is plain, and the ends of the cross-pieces fixed thereto are simple
half discs without any awkward angles to catch the dress of a person using the
machine.
This Invention is specially applicable to the lighter class of machines, such as
velocipedes and lawn mowers, but may be used generally where power is to be
transmitted from one pulley to another.
The cross-pieces aforesaid may themselves be made to form a band or chain by
being linked or hinged together instead of being riveted to a band or chain.
A friction roller may be carried if desired between the inner ends of each pair
of cone-frustra, so as to bear upon the corresponding semi-cylindrical recesses in
the periphery of the pulley and thus relieve the bearing friction between a cross-
piece and recess.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Aylward in the Great Seal Patent Office on the 1st
December 1881.
"E
JOHN AYLWARD, of Birmingham, in the County of Warwick, Manufacturer.
'IMPROVEMENTS IN MEANS OR APPARATUS FOR TRANSMITTING MOTIVE-POWER,
SUCH IMPROVEMENTS BEING SPECIALLY APPLICABLE TO THE LIGHTER CLASS OF
MACHINES, SUCH AS VELOCIPEDES AND LAWN MOWERS."
The object of this Invention is to obtain in an arrangement of pitched band or
chain and pitched pulleys, in which the band or chain works in conjunction with
the pulleys, so as to give motion from one pulley to another, the advantage of
certainty in action, though the pulleys may get somewhat out of line with one
another, and also of easy manufacture and application, and of presenting a tolerably
plain exterior surface where such is exposed.
To a metal or leather or other band, or to a flat chain which passes around
any two pulleys, one of which is used to give motion to the other, and on the side
of such band or chain which works next to the pulleys and at suitable distance
apart lengthways of the band or chain, I rivet crosspieces of metal or other
hard substance, shaped as two half frustra of cones having a common axis, and
joined together at their smaller ends preferably by a short semi cylindrical pieco
of the same diameter as the smaller ends of the frustra. The axis of each pair
of cone frustra lies across at right angles to the length of the band or chain,
each cross piece extending preferably across the entire width of the band or chain.
The back or flat part of each cross piece bears or beds against the band or chain.
The peripheries of the pulleys are formed preferably to the width of the band or
chain, and recesses corresponding to the cross pieces aforesaid, both in shapo and
distance apart, are sunk at intervals around the periphery of each pulley to receive
the said cross pieces. Power is conveyed from one pulley to the other through the
medium of the cross pieces gearing into the recesses. The double conical shape of
the cross-pieces and corresponding recesses tends to draw them into proper gear
when the pullies are out of line with one another in either direction. The cross
picces and pulleys may be readily manufactured by being moulded and cast,
though they may be made in any other suitable manner if preferred. The outer
surface of the band or chain is plain, and the ends of the cross-pieces fixed thereto
are simple half discs without any awkward angles to catch the dress of a person
using the machine.
This Invention is specially applicable to the lighter class of machines, such as
velocipedes and lawn mowers, but may be used generally where power is to be
transmitted from one pulley to another.
The cross pieces aforesaid may themselves be made to form a band or chain by
boing linked or hinged together instead of being rivetted to a band or chain.
A friction roller may be carried if desired between the inner ends of each pair
of cone frustra, so as to bear upon the corresponding semicylindrical rocesses in
the periphery of the pulley, and thus relieve the boaring friction between a cross-

page_text: suitable for working with this form of band; Figure 4 shows a chain band fitted
with the cross pieces; Figure 5 is an inside view of another form of link of the
chain band; Figure 6 is n sectional edge view of the same.
A is a band of suitable material, to which are rivetted crosspieces B, shaped as
already described, and shown in the Drawings; C is a pulley, in the periphery of
which are formed recesses C₁ corresponding to the crosspieces B, and pitched at
proper distances apart to receive them. The periphery of the pulley is preferably
of about the same breadth as the band and crosspieces. In Figure 4 a chain band
takes the place of the simple band shown in Figures 1 and 2, and when this form
is employed I prefer to cast or forin each crosspicce B and its link B' in one solid
piece; the links B¹ can be joined together by pieces of flat steel or other suitable
material B³, as shown.
In Figure 5 the link B¹ is similar to that shown in Figure 4, except that one or
both of its ends are formed with jaws B', between which is inserted the end of a
joint piece B² made solid and strong, a pin D being passed through the three and
forming a joint as shown. This arrangement is more particularly applicable to
heavy machinery when, of course, all the parts would be made proportionately
strong. Instead of the rigid central portion of the crosspiece previously shown a
friction roller E is inserted to relieve the friction between the crosspiece and the
in the nullo
Tiuse shows a nation of Niue ï unon line V Z
CLAIMS.
Having now described my Invention, and the method of performing the same, I
wish it to be understood that I am aware that pulleys have before now been
driven by a plain metal band passing round them, and also by means of a pitched
chain similarly applied, and gearing with projections or teeth upon the pulleys,
and that I therefore do not broadly claim such method of driving, but that what
I claim and desire to protect under the hereinbefore in part recited Letters
Patent is,-
First. The combination with a driving band A provided with crosspieces B of a
pulley C having in its periphery recesses C¹ corresponding in pitch and shape
with the said crosspieces, substantially as and for the purposes set forth and
shown.
Second. In a driving band the employment of the combined crosspiece and
link B and B', substantially as and for the purposes set forth and shown.
Third. The employment in or upon a driving band of the cross piece B having a
rigid centre portion, as in Figure 1, or a moveable roller E, as in Figure 5,
substantially as and for the purposes set forth and shown.
Fourth. The employment in or upon a driving chain or band of one or more
crosspieces, consisting essentially of a semicylindrical centre piece terminating in a
half frustum of a cone at each end, substantially as and for the purposes set forth
and shown.
In witness whereof, I, the said John Aylward, have hereunto set my hand
and seal, this Twenty ninth day of November, in the year of our Lord
One thousand eight hundred and eighty one.