Driving Pulley.
Year: 1894

page_text: Date of Application, 26th Apr., 1894
Complete Specification Left, 25th Jan., 1895-Accepted, 30th Mar., 1895
PROVISIONAL SPECIFICATION.
Driving Pulley.
JOHN DYMOND 20 Landscore Crediton Engineer do hereby declare the nature
of this invention to be as follows:-
This invention is mainly for the purpose of reducing the weight of belt carrying
pulleys and also to enable them to be more easily manufactured with a saving of both
materials and workmanship. It is well known that the present form of pulleys
leaves much to be desired, as where a large number are used and as is very often
necessary almost close together the weight of such pulleys is a great disadvantage
especially where the ordinary cast iron pulleys are used and as the cost of pulleys is
the first consideration great numbers of such pulleys are used as pulleys of the
necessary lightness are too costly.
To obviate these disadvantages I construct my new pulley in the following
manner:―
The rim or belt carrying surface is provided with one or more internal flanges
standing out at right angles from the rim, for lightness this may be rolled in one
piece. On the hub which I propose shall be a forging or stamping, I also
construct one or more flanges of the same length but standing outward from the
periphery of the hub and directly opposite the flange or flanges. From the interior
of rim the arm connecting the hub to the rim I propose attaching with screws or
rivets or any suitable means to the side of said flanges.
To give the necessary stability and rigidity I attach the said arms alternately to
one or the other side of flange in such a manner that where an arm is fastened to
the side of flange or hub it shall be attached to the opposite side of the flange on
the interior of rim the following arm in each case shall be fastened to the other
side of flange and so on however many arms are used.
The foregoing is described more particularly in reference to what is called a solid
pulley but this invention is equally applicable to what is known as a split pulley.
When made as a split pulley a portion of the said flange is cut away to enable the
ends of rim to be turned inward thus the two halves of pulley can be attached
together by bolts or any other well known means of fastening.
The hub is likewise made in halves and the flanges run into the webs necessary
to connect the two halves of pulley together when being fastened to a shaft with
screws bolts or other means of fastening.
Dhis much inf Ai 10.4
JOHN
DYMOND,
20, Landscore, Crediton, Engineer.
COMPLETE SPECIFICATION.
Driving Pulley.
I, JOHN DYMOND, of 20 Landscore, Crediton, in the County of Devonshire,
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 driving pulleys, and it has for its object reducing their
weight and enabling them to be more easily manufactured with a saving of both
material and labour. It is well known that the present form of pulley leaves much

page_text: to be desired as where a large number are of necessity placed close together on &
shaft the weight is a great disadvantage.
I attain the object of my invention in the manner shown by the accompanying
drawing in which :-
Figure 1 is a view in transverse section of a pulley constructed according to my
invention.
Figure 2 is a similar view of a modification thereof, and
Figure 3 is a view in side elevation thereof.
Figure 4 is a view in side elevation showing another forine my invention may
assume, and
Figure 5 is a view in side elevation showing a split pulley constructed according
to my invention.
Throughout the views similar parts are marked with like letters of reference.
The rim A which is preferably made of wrought iron is provided with one or
more internal radial flanges a preferably formed in one piece with it. On the
hub B which is preferably a forging or stamping are one or more radial flanges b
directly opposite the flange or flanges a on the rim A. The arm³ C connecting
the hub B to the rim A are attached to the said flanges by suitable bolts or
rivets .c.
To give increased stability and rigidity I prefer to attach the arms C
alternately to one and the other side of the flanges as shown by Figure 1 so that
the alternate arms cross.
When the pulleys are of the split type small flanges a¹ and bare formed on the
rim and hub respectively to provide a means of attaching the parts to one another
by bolts in the well-known manner.
There may be any number of arms in the wheel according to its size and the
work it is intended to do, and as a modification I sometimes place each alternate
arm at a tangent to the hub instead of at right angles to it as shown by Figure 4,
the tangential spokes on one side of the wheel being if desired laid in the opposite
direction to those on the other side.
I wish it to be particularly understood that I do not limit myself to the precise
details of construction herein before described and illustrated by the accompanying
drawing, but that I hold myself at liberty to make such changes and alterations as
fairly fall within the spirit and scope of my invention.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
(1) The improvements in driving pulleys, substantially as hereinbefore described
and illustrated by the accompanying drawing.
(2) A driving pulley consisting essentially of a rim having one or more internal
radial flanges, of a hub having one or more external radial flanges, and of arms
connecting the flanges of the hub with those of the rim and connected thereto by
bolts or rivets, as set forth.
(3) A driving pulley consisting essentially of a rim having one or more internal
radial flanges, of a hub having one or more external radial flanges, and of arms
connecting the flanges of the hub with those of the rim, the alternate arms being
respectively radial to, and at tangent with, the hub of the wheel, as set forth.
(4) A driving pulley consisting essentially of a rim having two or more internal
radial flanges, of a hub having two or more external radial flanges, and of arms
connecting the flanges of the hub with those of the rim, the alternate arms being
crossed from the one flange of the hub to the opposite Hange of the rim and vice
versa, as set forth.
הנימ
1
100
ROBERT E. PHILLIPS, M.I. Mech. E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.