Year: 1885

page_text: I, BRUNO PAUL TIDEMAN, Managing Director of the Company de Ysel, of
Kampen, Holland, 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, that is to say :-
My said Invention has for its object to improve the construction of split or
divided pulleys, and especially to contrive the parts by which the two halves of
each pulley are fixed together and upon the shaft so that the belt cannot catch
upon them when it is off the pulley. And my Invention consists essentially in
forming the bosses of the pulleys so that the bolts which fix the parts together are
within or between projecting collars or enlargements formed on the bosses, the
inner ends of the spokes being fixed in such collars or in some of them.
Examples of improved pulleys as made according to my Invention are shown on
an accompanying sheet of explanatory drawings. Figures, 1, 2, and 3, are sections
of three pulleys one half of the rim or hoop and spokes being supposed to be
removed in each case, and figure, 3, representing a stepped pulley or one with rims
or hoops of graduated diameters. Figures, 4, 5, and 6, are enlarged views of the
boss or centre of the pulley shown in figure, 1. Figure, 7, is a view like figure, 6,
but showing a boss the halves of which are fixed together with more bolts.
Figure, 8, is an enlarged view of a boss suitable for a pulley like that shown in
figure, 3, or which might be used for a pulley with a single rim or hoop when made
of extra strength. In these drawings the same reference letters are used to mark
the same or like parts wherever they are repeated.
The pulley represented in figure, 1, is made with a wrought-iron rim or hoop, A,
with a castiron boss, B, and with two sets of wrought-iron spokes, S, the rim, A,
and boss, B, being made in halves, a well-known arrangement admitting of the
pulley being fixed on or removed from a shaft without taking the shaft out of its
bearings. The boss, B, as shown enlarged in figures, 4, 5, and 6, is made with two
enlargements or collars, C, the outer surfaces of which are flush with the ends of
the parts of the boss enclosing the shaft; and the inner ends of the spokes, S, are
fixed in these collars, C. The halves of the boss, B, are made with flanges, F,
extending between the collars, C, and projecting from the body of the boss; and
the halves of the boss are fixed together by bolts, G, passing through these flanges.
If thought desirable, in the case of large pulleys the flanges, F, may be made larger
so as to receive more bolts, G, as shown in figure, 7.

page_text: In figure, 1, the spokes, S, are represented as being fixed to two parts of the
rim, A, near each edge; they may, however, if preferred, be all fixed to the middle
of the rim, A, as shown in figure, 2, although their inner ends are fixed to the two
collars, C, of the boss.
Where a set of graduated pulleys are required close together the several pulley
rims or hoops, A, may be conuected each by its own set of spokes, S, to separate
collars, C, formed on a single boss, B, made in two halves, such halves being fixed
together by flanges, F, and bolts, G, between the collars, C. For such sets of
graduated pulleys the boss, B, should be made with as many collars, C, as there
are sizes of pulley. The boss, B, shown enlarged in figure, 8, is suitable for a set
of three graduated pulleys such as is shown in figure, 3; but a boss of this kind
may also be used with a single rim or hoop, A, when the pulley is of extra size or
strength.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
The improved mode of forming the bosses or centres of split or divided pulleys
with collars or enlargements at the ends and with flanges for bolting the halves of
each boss together between such collars or enlargements, substantially as herein-
before described.