AN IMPROVED PULLEY OR DRUM
Year: 1877

page_text: LETTERS PATENT to Jolin Mackie, of Reading, in the County of Berks, Engineer,
for the Invention of " AN IMPROVED PULLEY OR DRUM."
the Commissioners of Patents on the 10th May 1877.
JOHN MACKIE, of Reading, in the County of Berks, Engineer. "AN IMPROVED
PULLEY OR DRUM."
This pulley is an improvement upon the ordinary split or divided pulley made in
halves, and overcomes the difficulty and loss of time occasioned in fixing such
pulleys upon driving shafts or spindles.
This Invention consists in the construction of the periphery and arms of the
pulley, which may be made of wrought iron, steel, or other metal, and the arms
may be made of various shapes or forms. The boss or centre of the pulley is made
in two pieces; into this boss the arms are inserted either by being cast, wrought,
rivetted, or screwed. The arms are made either of double or single bars of wrought
iron, steel, or other metal, and are fastened into the periphery of the pulley. The
periphery itself is split or divided, but has only one opening or division by means
of which it is opened, and when this is done the boss is also opened sufficiently to
place the pulley upon the driving shaft or spindle, the elasticity of the periphery
giving a sufficient opening of the half split or division in the same, and also of the
boss to enable this to be accomplished. This expansion or opening may also be
accomplished by means of a bow or hinge in the opposite side of the opening in
the periphery or rim of the pulley, as well as by its own elasticity, and this mode
of attaining the same object I include in my Invention.

page_text: This pulley is an improvement upon the ordinary split or divided pulley made in
halves, and overcomes the difficulty and loss of time occasioned in fitting pulleys
upon driving shafts or spindles.
This Invention consists in the construction of the periphery and arms or spokes
of the pulley, as shown in Figure I., which may be made of wrought iron, steel, or
other metal, and the arms or spokes may be made of various shapes or forms.
The boss or centre of the pulley marked A is made in two pieces; into this boss
the arms or spokes marked B are inserted either by being cast, wrought, rivetted,
or screwed. The arms or spokes B are made either of double or single bars of
wrought iron, steel, or other metal, and are fastened into the periphery of the pulley.
In the Drawing these are shown of double bars. The periphery itself is split or divided,
as shown in Figure 3, but has only one opening or division marked C, by means of
which it is opened, and when this is done the boss A is also opened sufficiently to
place the pulley upon the driving shaft or spindle D, the elasticity of the periphery
at the point E giving a sufficient opening of the half, split, or division in the
same C, and also of the boss A, to enable this to be accomplished. This expansion
or opening may also be accomplished by means of a bow or hinge in the side
opposite to the opening in the periphery or rim of the pulley C, as well as by its own
elasticity; and this mode of attaining the same object I include in my Invention.
Having now set forth the nature of my Invention of the improved pulley or
drum, and explained the manner of carrying the same into effect, I wish it to be
understood that under the above in part recited Letters Patent I claim,-
. I. The construction, combination, and arrangement of the arms or spokes, as
applied for the purposes herein-before described.
II. The one opening in the periphery of the drum or pulley.
III. The utilising of the elasticity of the materials used in the construction, so
as to pass the pulley or drum upon the shaft, all as herein-before described and
represented in the Drawing annexed.
In witness whereof, I, the said John Mackie, have hereunto set my hand and
seal, this Fifth day of September, in the year of our Lord One thousand
eight hundred and seventy-seven.
Witness,
THO. JAMES,
Reading Iron Works,
Reading.
JOHN MACKIE. (LS.)