Improvements in Driving and other Pullies.
Year: 1899

page_text: Date of Application, 14th Mar., 1899-Accepted, 13th May, 1899
Improvements in Driving and other Pullies.
We, ARNOLD STROUD, Engineer of Winterfold View and FREDERICK ELLIOTT,
Timber Merchant, of Pains Hill, both in Cranleigh, Guildford, in the County of
Surrey, do hereby declare the nature of this invention and in what manner
the sume is to be performed, to be particularly described and ascertained in and
by the following statement:-
Our invention relates to improvements in driving and other pullies and the
object is to provide means whereby the diameter of a pully can be altered so as
to take up any slackness of the driving or driven belt which may occur during use.
In carrying our invention into effect we proceed in or in about the following
manner making reference to the accompanying drawing in which Fig. 1 is a side
view Fig. 2 a section through AB Fig. 1, Fig. 3 a section through CD Fig. 1 of
a pully made in accordance with our invention. We provide a split or other
boss which is split at right angles to the axis of the "eye" as at b. Each
opposing face at is grooved so as to provide holes e in which are free to
move the inner ends d of the spokes or arms e. The two longitudinal parts of
the boss are fastened together by the bolts f. Slots are provided in the spokes e
and in these slots are fitted the wedges g. These wedges are arranged on a
ring free to slide on the boss a or in the case of a split boss they are arranged on
a segment such as which can be held in position by studs i passing freely through
holes in the segment, and into the boss a, inner and outer nuts and being
provided for localizing the segment in its required position on the studs i. The
outer ends of the spokes are attached to segmental plates forming the rim of
the pully. There are preferably four of these segmental plates two outer ones k
and two inner ones l. With this number of plates we prefer to use six spokes
all of which have their outer ends attached to the outer segmental plate k.
Two of the spokes e and e² are also attached to opposite ends of the inner
plates through which they pass before meeting the outer plates k.
opposite ends of the inner plates to those through which pass the spokes e
and are open slots m and the spokes and eare free to slide in these slots.
The inner plates are also slotted near the centre as at n and headed pins o pass
through these slots into the plates k. When it is required to increase the
diameter of the pully the bolts f are slackened and the segments h moved in,
thus causing the wedges to act in the slots at the ends of the spokes and so
lengthen the spokes and increase the diameter, the segmental plates and
sliding over one another and accommodating themselves to the increased diameter.
The bolts are then again tightened up.
l
At the
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:-
1. Expandable pullies having their rims formed by segmental plates free to
slide over one another, the spokes or arms being outwardly moveable by means
of wedges entering slots at the inner ends of the spokes, which slots are free to

page_text: work in holes or opposing grooves provided for their reception in the vertically
divided and bolt held or other boss of the pully, the wedges being grouped
together and attached to a seguient or ring free to slide on the boss and retainable
in any longitudinal position thereon by studs and nuts the studs passing through
the ring or segment into the boss, the whole substantially as described in the
above specification and exemplified in the accompanying drawings.
2. Expandable pullies _constructed substantially as described in the above
specification.
Dated this 28th day of February 1899