IMPROVEMENTS IN THE CONSTRUCTION OF GROOVED PULLEYS
Year: 1879

page_text: PROVISIONAL SPECIFICATION left by Alfred William Pearce and James
Durie at the Office of the Commissioners of Patents on the 20th December
1879.
Alfred WILLIAM PEARCE, of the Lilybank Foundry, Dundee, in the County of
Forfar, Engineer, and JAMES DURIE, of 11, Exchange Buildings, Saint Mary's Gate,
Manchester, in the County of Lancaster, Engineer. "IMPROVEMENTS IN THE
CONSTRUCTION OF GROOVED PULLEYS."
'This Invention consists in making grooved pulleys of wrought iron or steel, or
other suitable metal, whereby greater lightness and strength, and facility of
manufacture is obtained than in those in general use.
For the purpose of making the periphery or rim of the pulley or pulleys with
grooves, to receive a rope or ropes, made of animal or vegitable substance, we
employ bars of rolled iron or steel of such a section as will, when bent to the
desired curve in segments, and bolted or riveted together form one groove, and
any desired number of grooves can be formed in a similar manner to suit the
desired number of driving ropes for one pulley.
For one driving rope only one groove is required, and the bars are then made of
the desired section, and do not require bolting or riveting together only at sectional
joints which may be welded when required. By combining two or more bars by
welding, reviting, or bolting the sides of the bars together, we can make a pulley
of any required diameter and having any desired number of grooves, without
having to roll the metal with the requisite number of grooves.
We make the periphery or rim of the pulley or pulleys for use with a wire rope,
or a rope made of a metallic substance of bars of rolled iron or steel of the desired
section, but instead of one bar resting upon the side of another, we seperate the
bars by means of stay bolts or rivets, and into the space between the bars we insert
a layer or lining of some elastic vegitable or animal substance, such as wood,
leather, guttapercha, or indiarubber, and secure it in its place by means of bolts or
rivets, so as to form the bottom of the groove on which the metallic wire rope or
ropes rest or rests, and the bottom of the groove is make straight or curved as
required. The elastic substance can be removed and replaced as may be required
without disturbing the metallic periphery or rim of the pulley.
The pulleys may be made in halves and joined at the sectional joints by rivets
or bolts or by making the bars of which the periphery or rin is composed break-

page_text: joint, or overlap each other at two parts of the circumference, and fastening the
two parts together by means of rivets or bolts. In a similar manner by joining the
sectional joints by rivets or bolts, or by making the bars of which the periphery or
rim is composed break-joint, we can make the periphery or rim of the pulley in
segments, and fastening the segments together by means of rivets or bolts through
the sides of the bars.
The arms of the pulleys we make either of single or double bars of wrought iron
or steel, and fastened to the periphery or rim of the pulley by welding, riveting,
screwing, or bolting, or by other suitable means, and at the centre we fix them to a
boss of cast iron, wrought iron, or steel by being cast in, welded, riveted, or screwed
into the boss. In the case of a split pulley the boss will be split or devided and
joined together by means of bolts, hoops, or other suitable means.