MEN IN PULLEYS AND WHEELS
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by the said Thomas Smith at the
Office of the Commissioners of Patents on the 29th June 1883.
THOMAS SMITH, of Malpas Road, Brockley, in the County of Kent
MENTS IN PULLEYS AND WHEELS "
"
IMPROVE
This invention relates to pulleys or wheels, and more especially to such pulleys
or wheels when split or made in separate parts so that they can be opened and
fitted upon, or removed from, shafts or axles without inconvenience or the necessity
of removing the latter from their bearings.
I make the rim or circumference of the pulley or wheel in two parts, capable of
being separated or united preferably by means of a hinged joint at one point of
their circumference, and transverse angle irons or .brackets formed upon or bolted
or rivetted to the circumference at the opposite point, and so arranged that they
can be drawn and bolted together by means of a sufficient number of bolts passed
through their radial flanges, the rim of the wheel preferably projecting beyond the
angle iron on one of the segments of the wheel, and fitting upon the opposite
angle iron which is left projecting beyond the rim of the alternate segment.
The rim of the wheel is connected with the centre by means of a sufficient
number of arms, preferably of the kind hereinafter described. The centro is also
made in two parts and is constructed in the following manner.
The two parts are made so that when fitted and adjusted together a central hole
can be bored or made through then corresponding with the shaft or axle
upon which they are to be fitted, half of the central hole being in each of the
two parts.
Each part is made of the full width of the centre or boss of the wheel for that
half in which its half of the central hole is situated, whilst the other half consists
only of a lateral plate consisting of two horns or projections extending to the
full circumference of the boss but having an opening between them somewhat
[Price Gd.1

page_text: wider than the central bore. The two projections described, upon each of the
parts, fit over and upon corresponding parallel seats formed for them upon the
alternate part, so that when the two parts are fitted together they form a true
circular centre or boss having the central hole through them, and the two parts are
then fixed together by a sufficient number of transverse screws or bolts each of
which passes through the solid part of one of the halves and one of the projections
upon the alternate half, and a very strong, secure, and effective centre for the pulley
or wheel is thus obtained. In order to remove the pulley or wheel from its shaft
it is only necessary to separate the two halves of the rim or circumference and
then to withdraw the screws or bolts which connect the two parts of the centre
as described, which can then be separated from each other and removed from
the shaft.
Instead of the inner edges of the projections and of the corresponding seats
upon which they fit being made parallel as described, they may be made curved or
wedge shaped, so that the pulley or wheel can be removed or replaced by
disconnecting the angle iron at its rim only, the connection at the opposite sido
of the rim serving as a hinge upon which the two halves of the pulley or
wheel turn.
I prefer to make each of the arms of the pulley or wheel of an iron bar of
suitable section one end of which is cast or otherwise fixed into the boss or centre
described. The bar at a convenient distance from the centre is split or divided
into two parts and these two parts are separated and curved sufficiently in the
direction of the plane of the pulley or wheel and also in the direction of its width
their ends being fixed to the rim by rivets, screws, or other convenient means.
In this way a very strong and rigid, but simple arın is obtained.
My invention may be applied to pulleys and wheels of all kinds, such for
instance as driving pulleys or drums, or toothed wheels or pinions.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Thomas Smith in the Great Seal Patent Office on the 29th December
1883.
THOMAS SMITH of Malpas Road, Brockley in the County of Kent "IMPROVE-
MENTS IN PULLEYS AND WHEELS
33
My invention relates to pulleys or wheels used for various purposes, but more
especially to such pulleys or wheels when split or made in separate parts so that
they can be opened and fitted upon or removed from shafts or axles, without
inconvenience or the necessity of removing the latter from their bearings.
In order to put my invention in operation I make the rim or circuinference of
the pulley or wheel in two parts capable of being separated or united, either by
means of a hinged joint at one part of their circumference where they meet, and
transverse angle irons or brackets formed upon or screwed or rivettel inside to the
circumference at the opposite point, or preferably by transverse angle irons or.
brackets at both opposite points of the circumference so that they can be drawn
together and attached by means of a sufficient number of bolts passed through
their radial flanges, the rim of the wheel preferably projecting beyond the angle
irou upon one of the seginents of the wheel so as to fit and rest upon a part of
the angle iron which is left projecting to the same distance beyond the rim of the
alternate segment.
The rim of the wheel is connected with its centre by means of a sufficient
number of arms of any suitable kind, but preferably of the kind hereinafter
described.
The centre of the wheel or pulley is also made in two parts and is constructed
in the following manner, as shewn in the accompanying drawing which is in
illustration of my invention, Figure 1 being a side view of the two parts of the
wheel separated, and figure 2 a vertical transverse section through the axis.
The two parts of the centre are made so that when fitted and adjusted together
a central hole can be bored or made through them corresponding with the shaft or
axle upon which they are to be fitted, half of the central hole being in each of the
two parts of the wheel.
Each part is made of the full width of the centre or boss of the wheel for that
part of it in which the central hole is situated as shewn at a, a', whilst its
remaining part consists only of a lateral plate, consisting of two horns or
projections b, b, b¹, b³, extending to the full circumference of the boss but having an
opening between them c, c², somewhat wider than the central bore. The two
projections b¹, b¹, fit over and upon corresponding parallel seats d, d, formed for
them upon the other or alternate half of the boss, and the two projections b, b,
upon corresponding seats d', d', so that when the two parts are fitted together they
form a true circular centre or boss. having the central hole or bore through it, and
the two parts are then fixed together by a sufficient number of screws or bolts
passing through the holes e, c, e, e, each such bolt passing through the solid
part a, a, of one of the halves, and through one of the projections b, b, b¹, b', upon
the alternate half, and a very strong, secure, and effective centre for the pulley or
wheel is thus obtained.
In order to remove the pulley or wheel from its shaft it is only necessary to
disconnect the halves of the rim or circumference, at f, f, and then to withdraw
the screws or bolts which hold together the two parts of the centre or boss as
described, which can then be separated from each other and removed from the shaft
or axle.

page_text: Where the two halves of the rim of the wheel or pulley are hinged together at
one of the points f, f, as above described, the inner edges of the projections b, b,
b, b, and of the seats d, d, d', d, upon which they fit, are made curved or wedge
shaped instead of parallel as shewn, so that the pulley or wheel can be removed or
replaced by disconnecting the angle irons at one of the points f, only, the
connection at the opposite point of the rim forming a hinge upon which the two
halves of the pulley or wheel turn and separate.
I prefer to make each of the arms of the pulley or wheel of a bar of iron or
other metal and of suitable section, one end of the bar being cast or otherwise
fixed at g in the boss or centro already described. The bar at a convenient distance
from the centre boss is split or divided into two as shewn, these two parts being
separated and curved sufficiently in the plane of the pulley or wheel (as shewn
more plainly in figure 1), and also in the direction of its width (as shewn more
plainly in figure 2), the ends of the split and curved bar being fixed to the rim at
i, i, i, by rivets, screws or other convenient means. In this way a very strong
and rigid, but simple and cheap arm is obtained.
My invention may be applied to pullies and wheels of all kinds, such for
instance as driving pullies or drums, or toothed wheels or pinions, and I do not
confine myself to the precise form or proportions of the several parts, which may
be varied to suit the varying conditions and circumstances in which they are to be
applied, but having described my invention and the manner in which it is to be
porformed, I claim-The compound boss or centre formed in separate parts, each
part consisting of a solid segment of the boss, projecting picces, and seats for the
similar alternate projecting pieces upon the other part of the centre, the separato
parts being held together by bolts or screws, substantially as described and shewn
in the Drawing. Also, the method of making the arms for wheels or pullies, of a
bar having its outer end split, and separated both in the direction of the plane of
the wheel or pulley and in a direction transverse to such plane, substantially as
described and shewn in the drawing.
In witness whereof, I the said Thomas Smith have hereunto set my hand
and seal this 29th day of December in the year of our Lord 1883.
BTTAC
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