Improvements in Means for Securing Split or Divided Wheels or Pulleys upon Shafts.
Year: 1895

page_text: Date of Application, 27th Feb., 1895-Accepted, 30th Mar., 1895
COMPLETE SPECIFICATION.
Improvements in Means for Securing Split or Divided Wheels or
Pulleys upon Shafts.
I, ARNOLD GOODWIN, of 56 Sumner Street, Southwark, in the County of
London, 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 has for object to provide bushes of a simple and comparatively
inexpensive construction whereby split or divided wheels or pullers (hereinafter
referred to as split pulleys) are adapted to be securely fixed upon shafts of different
diameters by the mere tightening up of the bolts or connections by which the split
boss of a pulley is clamped around the bush and shaft, thereby dispensing with the
use of keys, screws or other auxiliary devices for effecting the connection of the
various parts with each other and with the shaft.
A bush according to my invention is split or divided longitudinally each of the
segments or parts being formed on the outer or inner surface, but preferably
on both the outer and inner surfaces, with longitudinal ribs or projections so
relatively arranged that upon inserting the divided bush in place between a shaft
and the split boss of a pulley and tightening up the two parts of the latter by screw
bolts, the pressure of such parts upon the external ribs or projections of the bush
will spring or force the inner surface of the bush, or the ribs or projections thereon,
into firm contact with the shaft in such a way that the several parts will be firinly
locked together and so that the wheel or pulley can be rotated indifferently in either
direction.
And in order that my invention may be clearly understood, I will proceed to
explain the same by aid of the accompanying drawings, wherein,
Fig. 1 is a side elevation, and Fig. 2 a plan showing a bush constructed according
to this invention.
b
This bush is made in two similar parts or segments 1, 1º of metal each provided
on its outer and inner surface preferably by casting, with longitudinal ribs 2, 24
respectively. These ribs are so arranged as to be located at opposite sides of
a plane a passing through the centre of the bush in a direction at right angles to
the plane of division c d of the bush, so that pressure exerted upon the outer ribs 2
will tend to close the inner ones upon the shaft. The two halves of the bush are
bored and turned to fit the shaft and pulley boss respectively with which they are
to be used, a space 6 of suitable width, say a quarter of an inch, being left between
their adjacent longitudinal edges 1b. I have found it advantageous to arrange the
centre line of the outer ribs 2 at a different angular distance a from the plane a than
that 6 of the corresponding inner ribs 2ª, as by this means a much firmer connection
is effected with the shaft and pulley boss than would otherwise be the case, but I do
not limit myself to this particular arrangement of the ribs, or to the provision of
ribs on both surfaces of the segments, though the best results are attained by using
two sets as shown.
To apply my ribbed bush for securing a pulley upon a shaft, the two parts 1, 1ª
of which it is composed are placed around the shaft and the two halves of the pulley
boss placed around them and drawn together by the tightening up bolts whereupon
the pulley will be found to be very securely locked in place upon the shaft. To
hold the bush centrally in place within the pulley boss, each of the parts 1, 1ª may

page_text: be provided at each of its longitudinal edges with a central recess 7 and two end
recesses 8.
Fig. 3 is a side view, and Fig. 4 a plan partly in section, showing the application
of a ribbed bush such as hereinbefore described to a pulley of comparatively small
size, say of 18 inches diameter or less. In this case the boss 4 and arms 4 are cast
in one piece which is fixed to the split or divided rim 4 of the pulley as well
understood, the boss being subsequently split and its parts drawn tightly towards
each other so as to grip the bush segments 1, 1ª by a single pair of bolts 5 which
are arranged to pass through the central recesses 7 in the bush segments and so hold
these segments in place both in a circular and endways direction.
Figs. 5 and 6 are similar views to Figs. 3 and 4 respectively, but drawn to
a smaller scale, showing the application of the bush to a pulley of a form such
I prefer to use for pulleys above 18 inches in diameter.
In this case the spokes 4 of the pulley are of wrought iron or steel fixed in the
two halves of the split boss which are drawn together by two pairs of bolts 5 which
are arranged to extend through the outer recesses 8 in the bush segments.
Fig. 7 shows to a larger scale, the divided boss of a pulley secured by a bush
according to my invention upon a shaft the diameter of which more nearly
approaches that of the bore of the pulley boss than in the other examples, so that
the radial depth of the ribs 2, 2* on the bush in this case is less than in the other
cases.
By providing a number of ribbed bushes of the kind herein described, of different
internal diameters and each formed externally to hit the interior of the boss of
a split pulley, such pulley will be adapted for use with shafts of different
diameters.
Figs. 3, 5, and 7 show the form of bushes suitable for the minimum, medium and
maximum diameters of shafts and internal pulley bosses having a fixed internal
diameter.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is :-
1. For securing a wheel or pulley on a shaft, a split or divided bush provided
on its inner or outer surface, or on both its inner and outer surfaces with longitudinal
ribs or projections substantially as herein described for the purpose specified.
2. The combination with a wheel or pulley, a shaft therefor, and tightening up
bolts, of a split or divided bush provided on its inner or outer surface or on both its
inner and outer surfaces with longitudinal ribs or projections substantially as
described and shown.
3. A split or divided bush provided on its inner and outer surfaces with
longitudinal ribs or projections arranged substantially as described and shown for
the purpose specified.
Dated this 27th day of February 1895.
ARNOLD GOODWIN.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.