Improvements in Gearing for Transmitting Power.
Year: 1894

page_text: Date of Application, 30th June, 1894,
Complete Specification Left, 30th Apr, 1895-Accepted, 22nd June, 1895
Improvements in Gearing for Transmitting Power.
We PHILIP LOUIS RENOUF and FREDERICK WESTWOOD, Managers of
1 Lombard Street Birmingham do hereby declare the nature of this invention to
be as follows:-
--
The object of this invention is to provide powerful but regular contact between
the parts of transmitting agencies. For this purpose we provide flexible surfaces
or covers to the driving or to the driven pulley, or to both of them, and keep these
flexible surfaces in even contact with the belt, band or other similar transmitting
agency by interposing a pneumatic air-chamber (containing air or gas, or other
vapour in compression) between this circumference and the centre of the pulley or
pulleys. The transmitting bands may be of any suitable flexible material and are
preferably edged with nonstretching cords or cables: by this means the centre of
the band will be enabled to arch over the swell or 'belly " of the pulleys, and
avoid all danger of coming off. A siinilar result may be obtained by providing the
nonstretching cord or cable, or equivalent device in the centre of the band, $0 that
it forces the centre of the pulley into a slight V or U shape. The transmitting
band may however itself form a pneumatic tube (either endless or jointed up) such
tube being confined within desireable limits by as suitable tubular jacket.
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PHILIP LOUIS RENOUF.
FREDERICK WESTWOOD.
We PHILIP LOUIS RENOUF and FREDERICK WESTWOOD, Managers, both of
1 Lombard Street, Birmingham, 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:-
The object of this invention is to provide powerful, but regular contact, between
the parts of transmitting agencies. For this purpose we provide flexible surfaces,
or covers to the driving, or to the driven pulleys, or to both of them and keep these
flexible surfaces in even contact with the belt, band, or other similar transmitting
agency, by interposing a pneumatic air chamber (containing air, or gas, or other
vapour in compression) between this circumference, and the centre of the pulley, or
pulleys. Referring to the drawings Fig. 2. shows the section of a pulley A. having
a concave rim b, and surrounded with a pneumatic tyre C of usual construction-
that is consisting of an airtight chamber d, restraining jacket e, and protecting
surface f. Two such pulleys A A 1. are shown in Fig. 1. connected by a driving
band G. Fig. 3 represents part of this driving band in the form we prefer to make
it, that is furnished with a pair of nonstretching edgings I. I., bridged by a semi
elastic texture or webbing H. Comparing the drawings Figs. 1. 2. & 3 it will be
readily understood, that when the surfaces of the pulleys A. A 1. are brought up by
Duin 71

page_text: inflating the air chambers d. the driving band G will be placed in tension, and
firmly gripped, whilst the edges I. 1. will resist stretch, and the web H will give
to and cover the swell or belly of the pulleys, thus affording additional grip and
preventing any possibility of riding loose or off. Where great power has to be
transmitted we sometimes use a compound pulley, with a series of pneumatic tyres.
Part of a pulley of this kind is illustrated in Fig. 4. In a case of this kind, it is
often advisable to furnish the band or belt with several nonstretching seams K. K.
in addition to the edgings I. I.
Under some circumstances we dispense with a band or belt entirely, and drive
one pulley off another directly, as in Fig. 5, where one of the pulleys only is
provided with a pneumatically tensioned surface. Of course both pulleys may
have surfaces of this kind, and one or both may be of compound construction as in
Fig. 6.
In this case great grip will be afforded by placing the larger circum-
ferences of each pulley, between the alternate ridges of the other pulley, and thus
affording a double number of contact points.
It should be understood that we do not limit ourselves to the use of banding,
such as described in Fig. 3, and that we may even protect the circumference of our
pulleys, with leather, wood, iron, steel, or any other surface, affording frictional
grip the object of the interposed pneumatic part, being to afford evenness, and
constancy of frictional contact. The tension of the hollow air-chamber may also
be supplied, by the injection, and compression of other fluid than air, such as various
gases or liquids.
The same result may be obtained by the employment of solid surfaces on the
pulleys, but providing the belt or banding, with an air chamber, capable of sufficient
tension, by inflation.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :
1. The combination of frictional surfaces for the purpose of transmitting, motion,
or power, by means of belting, and pulleys, or pulleys only, the constancy of
tension being provided, by the injection of air or other fluid, after the manner and
for the purpose described.
2. Supporting the rim or outer circumference of a driving or a driven pulley,
by means of a hollow chamber, tensioned by the injection of air or other fluid, for
the purpose described, aud substantially in the manner described.
3. The driving and driven pulleys A. A 1. in Figs. 1. 2. 4. 5 & 6. furnished with
a pneumatically tensioned circumference for the purpose described.
4. The belts or bands, shown in Figs. 3 & 4 consisting of the nonstretching
edgings I. I. and an elastic centre H. to be used in combination with pneumatically,
tensioned, and frictional surfaces, substantially as described.
5. The frictional driving mechanism illustrated in Fig. 6. where one or more
ridges of a pulley are in contact with one or more alternate ridges on another
pulley, some or all of these ridges consisting of inflated pneumatic tyres.
6. A hollow belt containing an air tight chamber, and tensioned pneumatically
so as to produce, sufficient driving contact with two, or more pulleys, furnished
with suitably shaped surfaces.
Dated this 29th day of April 1895.
PHILIP LOUIS RENOUF.
FREDERICK WESTWOOD.