Improvements in the Manufacture of Belt Pulleys in Two Parts.
Year: 1897

page_text: Date of Application, 5th Mar., 1897-Accepted, 17th Apr., 1897
Improvements in the Manufacture of Belt Pulleys in Two Parts.
A communication by RUDOLF CHILLINGWORTH of 37 St. Jobst, Nuremberg-
Ostbahnhof, in the Empire of Germany, Manufacturer.
1, 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 the manufacture of belt pulleys in two parts in a
simple and cheap manner from wrought iron. This object is attained as hereinafter
described with reference to the accompanying drawings, in which―
Figures 1 to 3 are elevations, partly in
manufacture, and
section of the device used in the
Figure 4 an elevation of a pulley formed by the improved manufacture.
A piece of tube a, which is of smaller diameter but the same width as the belt
pulley which is to be produced, is inserted in a die b shaped with a semi-cylindrical
hollow of the radius of the belt pulley, and is then subjected to pressure by means
of a press stamp c, whereby the tube is flattened somewhat and its under side shaped
exactly to the hollow of the die, Figure 2. In the tube prepared in this manner
there is then inserted a core or mandrel d of the form or shape shown in Figure 3,
and the upper part a¹ of the tube is again pressed by a further descent of the stamp,
which is provided with a semi-cylindrical projection c¹, and the upper part of the
tube is exactly formed to the shape of the upper surface of the mandrel.
Two sheet metal bodies produced in this manner are then bolted or secured
together as shown in Figure 4, and thus form a belt pulley which embraces the
shaft in the two semi-cylindrical recesses a² formed on the inner side of each part,
and the two parts when bolted together on the shaft, grip the latter so strongly
between them that any further fixing of the belt pulley is unnecessary.
In consequence of the excellent materials at disposal for tubes, more particularly
the so-called Mannesmann tubes, belt pulleys made in this manner exhibit with a
very light weight a very great strength. Moreover, this improved manufacture
enables belt pulleys to be made so exactly that no turning down or boring out of
the same is necessary, and from this point of view this invention affords an essential
advance over the methods hitherto employed.
When it is a question of making very small pulleys the process may be modified
by drawing out long tubes into the profile of a half belt pulley and then cutting off
pieces of the necessary width.
Having now particularly described and ascertained the nature of the said inven-
tion, 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 :-
1. The manufacture of belt pulleys in two parts, by drawing or pressing pieces of
tube of the necessary diameter into sheet metal bodies having one side curved to

page_text: the radius of the belt pulley and the other side flat, and provided with a semi-
cylindrical bulge or recess (a²) to embrace the shaft, substantially as herein before
set forth.
2. Semi-cylindrical half-pulleys bulged or recessed on the flat side, formed by
drawing or pressing pieces of tube in the manner set forth, and adapted to be bolted
or secured together to form belt pulleys, substantially as described.
Dated this 4th day of March 1897
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents.