An Improved Method of Making Belt Pulleys
Year: 1899

page_text: Date of Application, 5th June, 1899-Accepted, 12th Aug., 1899
COMPLETE SPECIFICATION.
An Improved Method of Making Belt Pulleys,
Communicated by RUDOLF CHILLINGWORTH, of Nuremberg, in the Empire of
Germany.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester,
both in the County of Lancaster, 118, New Street, Birmingham, in the County of
Warwick, and 322, High Holborn, in the County of Middlesex, Civil 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 its object a method of making belt pulleys even of the
largest dimensions of pieces of tube without fear of the strength or firmness of
the belt pulley being affected by the thinness of the walls of the pieces. For
this object the belt pulley, as shown in Figure 1 of the accompanying drawings,
is formed of segment or sector shaped parts (for instance in Figure 1 of 5 parts).
The method of making these segment pieces consists in short pieces of tube of
the length of the belt pulley which is to be made being converted by drawing
pressing or the like into sector shaped flat metal bodies of the form shown in
Figure 1 after which these flat bodies may be arranged with their plane surfaces
against one another and held together by screwing or the like to form a com-
plete belt pulley.
One way of carrying out this method is shown as an example in Figures 2-10.
A short piece of tube a is placed with its lower edge on a matrix b, Figure 2,
and expanded into a segment or sector shaped flat-metal body, Figure 5, by
means of a die or stamp ed inserted in the piece of tube. In order to allow
of this the underpart of the said stampe has a cylindrical cross section, Figure 4,
and this cylindrical part fits exactly into the tube a whilst the upper part has
a sector shaped cross section, Figure 3. The change from the cylindrical to the
sector shaped part is only a gradual one, so that when the stamp is pressed down
the piece of tube a is quite gradually expanded to the sector shaped sheet metal
body shown in Figures 5 and 6. The matrix b, as shown in Figure 4, has a
recess e in which the stamp fits when depressed.
The sheet metal body a, Figure 6, is then placed in a matrix, h, Figure 7,
having a cylindrical hollowed out part corresponding to the diameter of the belt
pulley to be formed, an intermediate piece in two parts f g of the form shown in
Figure 10 being inserted in the flat metal body a. By pressing down a sector
shaped stamp i, the pressure surfaces of which are provided with excrescences
or projections 7, as shown in Figure 8, the flat tube walls are made to agree with
the side surfaces of the intermediate pieces f and g, Figure 10, in such a way that
the sector shaped body a, shown in Figure 9 with lateral impressed surfaces m
is produced. Simultaneously this body a on the depression of the stamp i,
Figure 8, which at n, Figure 7, is cylindrically shaped to correspond with the

page_text: hub hole, receives a rounding corresponding to the cylindrical part of the
stamp, which rounding could only be imperfectly obtained by the expansion
which takes place by the operation shown in Figure 2.
The sector shaped flat metal bodies obtained in this manner and having the
form shown in Figure 9 are placed together with their impressed surfaces in
contiguity and combined or connected by means of screwing or the like in the
manner shown in Figure 1 to form a belt pulley, in the present case composed
of five parts, but in any case of several parts.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated
to me by my foreign correspondent, I declare that what I claim is:-
The method of making divided multi-part belt pulleys characterised by short
pieces of tube being converted by drawing, pressing or the like, into flat metal
bodies (a) having the form of sectors or segmental sections of the belt pulley to
be formed and put together with their plane surfaces in contiguity to form a
multi-part belt pulley substantially as hereinbefore described.
Dated this 3d day of Tuna 1800
W. P. THOMPSON & Co.,
Agents.