Year: 1888

page_text: Date of Application, 6th Feb., 1888
Complete Specification Left, 7th Aug:, 1888
Complete Specification Accepted, 7th Sept., 1888
I, GEORGE WILLIAM HARGREAVES BROGDEN, of Gresham House, Old Broad
Street, in the city of London, Engineer, do hereby declare the nature of this invention
to bo as follows :-
:-
This invention relates to improvements in the manufacture of what are known as
waved grooved or grip pulleys whereby I am enabled to manufacture them in a cheaper
manner than hitherto, and in some cases to reduce their weight.
In carrying out my invention I make my improved pulleys from steel or wrought
iron or from cast metal and I either stamp them from sheet metal in which case the
pulleys are formed in halves and suitably connected together, or I roll the rims from
wrought iron, steel or other metal and wave the periphery thereof and I arrange or
cross the arms or spokes in such a manner that the constantly varying thrust arising
from the groove being waved is provided for thereby considerably adding to the
strength of the pulley which allows of diminishing its weight.
It will be obvious that this latter part of my invention is also applicable to
pulleys made from cast iron, or partly from cast and partly from wrought
metal.
In cases where the rims are made from cast metal I find it advantageous for small
pulleys to cast the rims in halves following the line of the wave.
I sometimes make my pulleys with more than one waved groove.
Where the rims are cast in one piece as is advantageous for large pulleys I form the
mould and core for casting the rini by employing a core box corresponding with the
half of the length of one complete wave to be given to the groove.
Dated the 6th day.
1000

page_text: I, GEORGE WILLIAM HARGREAVES BROGDEN, of Gresham House, Old Broad Street,
in the city 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 :-
My invention relates to the manufacture of what are known as. waved-groove or 5
grip pulleys, and it consists essentially in forming such pulleys in halves, the line of
separation following the line of the wave of the groove. By means of this
construction I am enabled to produce grip pulleys in a cheaper manner than
hitherto.
In the accompanying drawing
Figure 1 is a side elevation of a portion of a pulley constructed according to my
invention; and,
Figure 2 is a vertical section of the same on the lineæ, æ.
Figures 3 and 4 are side and edge elevations respectively of a detail hereinafter
described.
a, 6 indicate the two halves of a pulley, and c, e bolts which connect the said
halves.
As herein before stated the line of separation between the two halves follows the
line of the wave, cach half being provided with a series of projections & and hollows e.
Figure 4 which alternate with each other and fit into or receive corresponding
hollows and projections on the other half, as indicated by dotted lines in Figure 2.
In cases where pulleys of large diameter are required, or where they have to be
transported I prefer to make each of the halves a, b in sections. In the pulley, part
of which is represented, each half is composed of four similar sections of the kind
represented in Figures 3 and 4. In securing the respective sections of the two halves
in position, the joints between the sections of one half are caused to alternate with
the joints of the other half, as shown in Figure 1, where the joint between the two
sections constituting the half a is exactly midway between the joints of an adjacent
section of the half b, the said joints being indicated by the dotted lines b³, b¹.
In order to reduce the weight of the pulley as much as possible the outer sides
thereof at the paris adjacent to the projections & are hollowed out as at f; or the
exterior surface of the flanges of the pulley may follow the wave of the trend in
which case the flanges are of approximately uniform thickness at all parts.
As shown in the drawing the spokes of the pulley are cast integral with the run. If
desired however separate spokes of any suitable construction may be employed.
In this case the runs may be made of wrought iron or steel or other metal.

page_text: 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. A waved-groove or grip pulley formed in halves, the line of separation between
which follows the line of the wave of the groove, substantially as described.
2. In a waved-groove or grip pulley formed in halves as hereinbefore described,
constructing each half in sections, substantially in the manner set forth.
3. The manufacture and use of waved-groove or grip pulleys constructed substantially
as heroinbefore described and illustrated in the accompanying drawing.