IMPROVEMENTS IN THE CONSTRUCTION OF DRIVING DRUMS, STRAP PULLEYS, OR RIGGERS
Year: 1873

page_text: LETTERS PATENT to Robert Mathers, of Leeds, in the County of York,
Engineer, for the Invention of "IMPROVEMENTS IN THE CONSTRUCTION
OF DRIVING DRUMS, STRAP PULLEYS, OR RIGGERS."
Sea the 9th December 1873, and dated the 12th June 1873.
PROVISIONAL SPECIFICATION left by the said Robert Mathers at the
Office of the Commissioners of Patents, with his Petition, on the.
12th June 1873.
I, ROBERT MATHERS, of Leeds, in the County of York, Engineer, do
hereby declare the nature of my said Invention for " IMPROVEMENTS IN THE
CONSTRUCTION OF DRIVING DRUMS, STRAP PULLEYS, OR RIGGERS," to be as
follows: :-
The objects of these improvements are economy in construction,
strength, and lightness, a more certain balance of parts, facility of
fixing and removing, and advantages in packing for railway conveyance
or other transmission. For these purposes I employ or use a set of arms,
boss, and narrow bearing rim, which may be whole or in halves. When
in halves they are bolted or cottered together at the rim and boss in the
usual well known manner.

page_text: The driving surface or rim is formed of a separate band or strip of iron
or steel of a suitable thickness, and of any breadth required, and may
also be made flat or convex. This band or strip of iron or steel is made
by bending so as to encircle or fit the bearing rim and arms, the two
ends being fitted and joined by means of a butt plate and bolts, screws,
or rivets, or in the manner of a clasp hoop with loops and cotters, or
other convenient and suitable means, so that the same may be held
firmly together.
Projections on the inner side of the driving rim, fitting into corres-
ponding recesses in the periphery of the bearing rim, or countersunk
screws or bolts may also be used to secure and retain the same when in
position.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Robert Mathers in the Great Seal Patent Office
on the 11th December 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ROBERT
MATHERS, of Leeds, in the County of York, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twelfth day of June, in the year of our
Lord One thousand eight hundred and seventy-three, in the 36th
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said Robert Mathers, Her special license that I, the
said Robert Mathers, my executors, administrators, and assigns, or such
others as I, the said Robert Mathers, my executors, administrators, or
assigns, should at any time agree with, and no others, from time to
time and at all times thereafter during the term therein expressed,
should and lawfully might make, use, exercise, and vend, within the
United Kingdom of Great Britain and Ireland, the Channel Islands, and
Isle of Man, an Invention for "IMPROVEMENTS IN THE CONSTRUCTION OF
DRIVING DRUMS, STRAP PULLEYS, OR RIGGERS," upon the condition (amongst
others) that I, the said Robert Mathers, my executors or administrators,
by an instrument in writing under my hand and seal, should particularly
describe and ascertain the nature of the said Invention, and in what
manner the same was to be performed, and cause the same to be filed

page_text: in the Great Seal Patent Office within six calendar months next and
immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Robert Mathers, do hereby
declare the nature of my said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement, that is to say :-
My said Invention has for its object improvements in the construction
of driving drums, strap pulleys, or riggers, whereby greater facility is
afforded for fixing and removal, and convenience of packing for trans-
mission, combined with lightness, strength, and a more even balance, and
with economy in first cost. For these purposes in constructing drums,
pulleys, or riggers, I employ or use a set of arms, boss, and narrow
bearing rim, which may be whole or in halves. When in halves they
are bolted or cottered together at the rim and boss in the usual well
known manner, the boss being bored to the size required, and the
periphery of the narrow bearing rim being suitably turned to receive a
sheet steel or iron cover forming the driving surface.
This driving surface or rim constitutes a separate band or strip of sheet
iron or steel of a suitable thickness and of any breadth required, and is
bent into form by passing it repeatedly through and between a pair of
bending rolls of hard or chilled metal for the purpose of bringing it to the
diameter required. The driving rims thus formed may be made flat or
convex in cross section by means of suitable rolls, the curvature and
cold rolling greatly increasing the rigidity and improving the rim as a
driving surface. The rim or cover is thus made to encircle or fit upon
the turned periphery of the narrow bearing rim and arms, and has its
two ends fitted and joined together by means of a butt plate or plates
and bolts, or by screws or rivets, or in the manner of a clasp hoop, with
loops and cotters, so that the same may be held firmly together.
Projections on the inner side of the driving rim, fitting into corres-
ponding recesses in the periphery of the bearing rim or countersunk
screws or bolts, may also be used to secure and retain the driving rim
when in position.
When a great width of driving surface is required two or more bearing
rims placed at suitable distances apart may be used for carrying and
supporting any width of driving rim required, which is to be held in
position and secured by the means and in the manner before described.

page_text: Having now described and particularly ascertained the nature of my
said Invention, and the manner in which the same is or may be used or
carried into effect, I would observe in conclusion that what I consider to
be novel and original and therefore claim as the Invention secured to me
by the herein-before in part recited Letters Patent is, the construction
and use of driving drums, strap pulleys, or riggers having hard rolled
sheet steel or iron driving rims or covers of a flat or curved transverse
section fitted and fixed upon a bearing rim, arms, and boss, substan-
tially as and for the purposes herein-before described.