IMPROVEMENTS IN APPARATUS FOR TRANS- MITTING MOTIVE POWER
Year: 1878

page_text: LETTERS PATENT to Norman Macbeth, of Bolton, in the County of Lancaster.
Engineer, for the Invention of "IMPROVEMENTS IN APPARATUS FOR TRANS-
MITTING MOTIVE POWER."
Sealed the 8th November 1878, and dated the 12th August 1878.
PROVISIONAL SPECIFICATION left by the said Norman Macbeth at the Office
of the Commissioners of Patents on the 12th August 1878.
NORMAN MACBETH, of Bolton, in the County of Lancaster, Engineer.
MENTS IN APPARATUS FOR TRANSMITTING MOTIVE POWER."
"IMPROVE-
My improvements in apparatus for transmitting motive power consist of a novel
form or construction of driving band, which is applicable in cases where one or
more driving bands work in one or more sets of annular grooves of V or other
suitable sectional form passing around the circumferences of the pulleys which
transmit and receive the motive power.
The bands are formed of ordinary wire rope of any suitable number of strands
or wires of steel or other suitable metal, which may be either galvanised or not.
In one form of my improved apparatus I string or thread upon the wire rope
washers of leather, india-rubber, or other pliant material, the holes in which are of
such size as to fit the wire rope. The outside form of the washers is either circular
or of such form as best suits the peculiar sectional form of the annular grooves in
the pulleys in which the band has to work. I unite the ends of the band after
the washers are strung on by splicing them together, or in some other suitable
manner. After the ends of the band are united the washers are distributed so as to
cover the part where the splice or joint has been made, and in spaces which are left
between quantities or detachments of the washers, placed at equal or nearly
distances around the length of the band, I attach to the wire rope rings or collars
of metal or other hard substance, which in cases where rings or collars of metal,
such as lead or tin, are used, may be cast upon their places on the wire rope. When

page_text: the rings of metal or other substance are fixed in their places upon the band the
leather or other washers are packed close together, and form a continuous and un-
broken covering around the wire rope between the metal rings or collars. The leather
or other washers serve to protect the wire rope which sustains the tensile strain
exerted upon the band in transmitting the power, and they at the same time serve
to give the necessary frictional bite of the band upon the pulleys. The rings of
metal or other hard substance serve to keep the leather or other washers packed
closely together, and prevent their slipping along the wire rope.
In another form of my improved apparatus I dispense with the washers of pliant
material, and protect the wire rope and take the bite on the pulleys by means of
the rings or collars of metal, which in this case I prefer to make of some metal of
a softer nature than the wire forming the rope.
In some cases two or more wire ropes placed side by side may be made to form
the core part of the driving band.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Norman Macbeth in the Great Seal Patent Office on the 8th February
1879.
NORMAN MACBETH, of Bolton, in the County of Lancaster, Engineer. " IMPROVE-
MENTS IN APPARATUS FOR TRANSMITTING MOTIVE POWER."
My improvements in apparatus for transmitting motive power consist of a novel
form or construction of driving band, which is applicable in cases where one or
more driving bands work in one or more sets of annular grooves of V or other
suitable sectional form passing around the circumferences of the pulleys which
transmit and receive the motive power.
And in order that my Invention may be fully understood, and readily carried
into operation, I will proceed to describe the accompanying Sheet of Drawings.
Fig. 1 is an elevation of a pair of grooved pulleys with my improved driving
band, and Fig. 2 is a section of the same. In this instance I have shewn the pulleys
with two grooves, but the number of grooves can be varied.
The bands are formed of ordinary wire rope of any suitable number of strands
or wires of steel or other suitable metal, which may be either galvanised or not, as
shewn in Fig. 3, which represents one form of my improved driving band.
I string or thread upon the wire rope a washers of leather, india-rubber, or other
pliant material b, the holes in which are of such size as to fit the wire rope a. The
outside form of the washers is either circular or of such form as best suits the
peculiar sectional form of the annular grooves in the pulleys in which the band has
to work.
In Figs. 4, 5, and 6, I have shewn three different forms of washers, but the form
can be varied to any extent. The ends of the band after the washers are strung on
are united by splicing them together, or in some other suitable manner. After the
ends of the band are united the washers are distributed so as to cover the part
where the splice or joint has been made, and in spaces which are left between
quantities or detachments of the washers, placed at equal or nearly equal distances
around the length of the band, I attach to the wire rope rings or collars c of metal
or other hard substance. When these rings or collars are made of soft metal, such
as lead or tin, they may be cast upon their places on the wire rope. When the
rings of metal or other substance are fixed in their places upon the band the leather
or other washers are packed close together, and form a continuous and unbroken
covering around the wire rope between the metal rings or collars. The leather or
other washers serve to protect the wire rope which sustains the tensile strain exerted
upon the band in transmitting the power, and they at the same time serve to give
the necessary frictional bite of the band upon the pulleys. The rings of metal or
other hard substance serve to keep the leather or other washers packed closely
together, and prevent their slipping along the wire rope.
In Fig. 7 I have shewn a modification of my Invention. In this instance, instead
of the metal rings or collars c shewn in Fig. 3, I employ either steel springs, as
shewn at d, or pieces of leather wound over the core, as shewn at e.
In some cases the parts marked c, d, and e may be dispensed with.
Having thus stated the nature of my Invention, and described the manner of
performing the same, I declare that I claim the improved driving bands, con-
sisting of a wire rope core with washers of leather or other pliant material, and

page_text: either with or without the intermediate parts marked c, d, and e, as shewn and
described.
In witness whereof, I, the said Norman Macbeth, have hereunto set my hand
and seal, this Twenty-fourth day of December, One thousand eight hundred
and seventy-eight.
NORMAN MACBETH. (L.S.)