Improvements in Pulleys.
Year: 1893

page_text: Date of Application, 11th Aug., 1893
Complete Specification Left, 11th June, 1894-Accepted, 28th July, 1894
Improvements in Pulleys.
I JOHN HEWETT of 14 Mill Street Hanover Square London in the County of
Middlesex Electrical Engineer do hereby declare the nature of this invention to be
as follows:-
This invention has for its object the production of a pulley, for transmitting
power, by belts, ropes or friction, the principal objects sought to be obtained being
lightness, strength, and greater "grip" on the belt or rope.
In carrying out this invention I employ for the rim of my pulleys a compressed
fibrous material such as wood or other pulp, such pulp being made into rings of the
desired width, diameter, & thickness, these rings may be made either by moulding
the pulp in a suitably constructed wire covered & perforated mould the moulded
rings being afterwards submitted to pressure in another mould so as to condense &
further consolidate the fibres contained in the pulp, or the rings may be obtained
by stamping the same from sheets or boards such sheets or boards being made
either by hand in a hand mould or by means of a machine as is used in millboard
or paper mills.
.
The rings made by one of the above mentioned means after being dried &
flattened by rolling are saturated thoroughly with a hot mixture of linseed oil &
calophony or resin, or with a mixture of ordinary or drying resin oil & resin, or
with any other suitable oil or gum, whereby the pulp rings become waterproof
capable of being operated on by cutting tools. & hardened through their entire
thickness, to accelerate the hardening or drying process I may submit the saturated
pulp rings to a temperature of say 100° to 140° F. whereby the oil will become
oxidized & hard in & thro' the body of the pulp rings. Rings so made are taken
& built up into a tube of the desired depth to form the rim of my pulley, spaces
being arranged to enable the arms of the said pulley to be put in the several rings
forming the rim of the pulley may be cemented together but in any case should be
held together by means of wooden or other pegs, pins, or dowels, such pegs pins or
dowels, being driven into holes drilled thro' the rings from face to face, such pegs,
pins or dowels may be round, square hexagonal or of other suitable cross section.
The arms for such pulleys may be of wood, metal, compressed pulp like the rim,
or of a heavily compressed mixture of wood dust or ground dried pulp, held
together by any suitable agglutinate.
The arms of these pulleys may be of the same length as the diameter of the pulley
rims in which case certain of the rings forming the rim would be cut short &
spacing rings of the full circumference would be used between the arms, the whole
being held together as above described, & turned up true to carry to the belt
or rope, or I may have the arms of the pulley cut shorter than the full diameter of
the rings in which case certain of the rings forming the rim instead of being cut
short would only be partially cut out, so that the ends of the arms would be
"shrouded" in the rings when the requisite number are built up to form the
desired depth of rim.
The rim after being built up as above described, & before the arms are put in, is
bored out the arms are then put in & fixed, the hole to fit the shaft in the centre of
the arms is next cut out, the pulley is then split, fastened together with screwed
studs, bolts or other suitable fastenings & the pulley is fixed on a suitable mandril,
so as to enable the periphery & sides to be turned up true.
Dated this 11th day of August 1893.

page_text: Improvements in Pulleys.
I, JOHN HEWETT, of 14 Mill Street, Hanover Square, London, in the County of
Middlesex, Electrical Engineer, 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 :-
This invention relates to pulleys for transmitting power, and has for its object
the production of a pulley for transmitting power, by belts, ropes or friction, the
principal objects sought to be obtained being lightness, strength, and greater
"grip" on the belt or rope.
In carrying out this invention I employ for the rim of my pulley a compressed
fibrous material such as wood or other pulp, such pulp being made into rings of the
desired width, diameter and thickness; these rings may be made either by moulding
the pulp in a suitably constructed wire-covered and perforated mould, the moulded
rings being afterwards submitted to pressure in another mould so as to condense
and further consolidate the fibres contained in the pulp; or the rings may be
obtained by stamping the same from sheets or boards, such sheets or boards being
made either by hand in a hand mould, or by means of a machine, as is used in
mill-board or paper mills.
The rings, made by one of the above mentioned means, after being dried and
flattened by rolling, are saturated thoroughly with a hot mixture of linseed oil and
calophony or resin, or with a mixture of ordinary or drying resin-oil and resin, or
with any other suitable oil or gum, whereby the pulp rings become waterproof,
capable of being operated on by cutting tools, and hardened through their entire
thickness; to accelerate the hardening or drying process, I may submit the
saturated pulp rings to a temperature of say 100° to 140° Fahr., whereby the oil
will become oxidized and hard in and through the body of the pulp rings.
Rings, so made, are taken and built up into a tube of the desired depth to form
the rim of my pulley, spaces being arranged to enable the arms of the said pulley
to be put in; the several rings forming the rim of the pulley may be cemented
together, but, in any case, should be held together by means of wooden or other
pegs, pins, rivets, bolts, or dowels; such pegs, pins, rivets, bolts, or dowels, being
driven into holes drilled through the rings froin face to face; such pegs, pins,
rivets, bolts, or dowels, may be round, square, hexagonal, or of other suitable cross
section.
The arms for such pulleys may be of wood, metal, compressed pulp, like the
rim; or of a heavily compressed mixture of wood, dust, or ground dried pulp, held
together by any suitable agglutinate.
The arms of these pulleys may be of the same length as the diameter of the
pulley rim, in which case certain of the rings forming the rim would have pieces cut
out of them to make spaces for the end of the arms, and spacing rings of the full
circumference would be used between the arms, the whole being held together as
above described and turned up true to carry the belt or rope; or I may have the
arms of the pulley cut shorter than the full diameter of the rings in which case
certain of the rings forming the rim instead of having pieces cut quite out, would
only have spaces or recesses partially cut out, so that the ends of the arms would
be "shrouded" in the rings, when the requisite number are built up to form the
desired depth of rim.
The rim after being built up, as above described, and before the arms are put in,
is bored out; the arms are then put in and fixed; the hole to fit the shaft in the
centre of the arms is next cut out; the pulley is then split, fastened together with
screwed studs, bolts, or other suitable. fastenings; and the pulley is fixed on a
suitable mandril, so as to enable the periphery and sides to be turned up true.

page_text: Instead of putting in merely transverse arms as above described, I may form the
centre-support of a disc or discs upon which the rings are fixed in a similar manner
as above described to form the rim of the pulley; the disc or discs having a hole
through the centre for its attachment to the shaft, and also other holes in their body,
through which gripping plates can be inserted, to transmit the strain of the tightening-
bolts to the disc or discs, so as to fix the latter on the shaft.
In order that my invention may be the better understood I will now describe it.
in relation to the drawings hereunto annexed, reference being had to the letters and
figures marked thereon.
Like letters refer to like parts in the various figures.
Figure 1 is a side view of a pulley made according to my invention, in which.
transverse arms are arranged for the centre support.
Figure 2 is a sectional view of one half of the pulley on the line W w,.
Figure 1.
Figure 3 is a side view of the pulley, made with discs as the centre support.
Figure 4 is a sectional view of the pulley, shown in Figure 3, on the line X X.
By reference to figure it will be seen that the rim A is formed of rings a, of
which a' a' are the outside keep rings; a' a² are the rings which have pieces cut-
out of them, to make room for the ends of the arms C, and a, a, a are the rings
which have recesses on the internal periphery into which the arms C₁ are mortised..
Distance pieces D, formed as rings, or as short pieces between arms, are inserted
between the arms C' C', in order to properly support the rim, when the rings a
are clamped together. Through the rings a I insert pins, dowell rivets, or bolts E,
to hold the rim together; although it must be understood that, if necessary, the
rings may be cemented together as well. In the drawings rivets are shown as the-
means of fastening, four of which pass through that portion of the rim in which
the ends of the arms CC are held, and consequently passes through the said ends.
of the arms. The other rivets are disposed around the rim, at any convenient-
distances that may be thought desirable. The two halves of the pulley are held
together by plates F and bolts G, the latter pass down in the space between the
arms; a small amount of clearance is provided upon the faces of the arms,.
adjacent to one another, on the two halves, to permit the arms to be tightened on.
to the shaft by the bolts G. 1 provide projecting registering pieces H on the
internal periphery, so that the two halves of the pulley will register one with the:
other when put together.
In Figures 3 ard 4 it will be seen that the centre support, or equivalent of
the arms, is formed of discs C, upon which the rings a a are attached, and held
together by rivets E. Holes J are provided in the discs C, into which plates F
are inserted; bolts G, passing through the plates F, serve to produce the strain.
necessary to fasten the pulley on its shaft. I divide the rim of the pulley
by an irregular line so as to form a means of registering the two halves to one-
another.
It is obvious that I may make all of the arms C C¹, as shown in Figures 1 and 2,.
with their ends extending out to the periphery of the rim, without departing from.
the essence of my invention.
Having now particularly described and, ascertained the nature of this said.
invention, and in what manner the same is to be performed, I declare that what.
I claim is :-
1st. A pulley constructed of a series of rings of compressed paper or other
fibrous material, fixedly attached to one another, side by side, and having dowels,.
rivets, or bolts, passing therethrough, to form the rim or periphery; the rim
being supported by a centre, adapted to transmit strain, substantially as described.
2nd. A pulley having a rim made up of rings of compressed paper or other-
fibrous material, in combination with arms or discs interposed between, or mortised
into, the said rings, to form the centre support, and held together by bolts, rivets,.
or dowels, transversely disposed therethrough, substantially as described.

page_text: 3rd. A pulley, having a rim of compressed paper or other fibrous material,
substantially as described and illustrated in Figures 1 and 2 of the accompanying
'drawings.
4th. A pulley, having a rim of compressed paper or other fibrous material,
substantially as described and illustrated in Figures 3 and 4 of the accompanying 5
drawings.
Dated this 11th day of June 1894.
FELL & WILDING,
1, Queen Victoria Street, London, E.C., Agents for the Applicant.