Improvements in or in the Manufacture of Belt Pulleys.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in or in the Manufacture of Belt Pulleys.
I, OSCAR MARTII, of Pfaffstatten, Lower Austria, in the Empire of Austria,
Engineer and Machine Manufacturer, do hereby declare the nature of this inven-
tion to be as follows:--
This invention relates to a belt pulley, the rim a of which is pressed out of sheet
metal.
It is shown in the accompanying drawings, in which:Fig. 1 is a side elevation,
Fig. 2 a cross section, Fig. 3 a view on an enlarged scale of a portion of the pulley,
and Fig. 4 a similar view of a modification, Figs 5 and 6 are plan and cross section
showing the method of making the ma.
The rim as shown in Figs. 1, 2 and 3, is formed of thin sheet iron or any other
suitable metal by stamping into dies or swage blocks formed of rings, with the
object of obtaining a completely and exactly cucular form provided with hook-
shaped or straight bent over edges b. Fig. 3 shows hook-shaped edges. Fig. 4 the
straight bent edges
By this simple method of construction the rim a is rendered extremely light
and firm, and does not require to be turned down owing to the exact cucular
form obtained.
The method of making the rima is shown in Figs. 5 and 6
c represents the rings of which the die is formed, whilst d represents shaping.
rings over which the edges 6 of the rim a are flanged or bent down.
Of course the rim may be made flat or domed.
Improvements in or in the Manufacture of Belt Pulleys.
I, OSCAR MARTII, of Pfaffstätten, Lower Austria, in the Empire of Austria,
Engineer and Machine Manufacturer, do hereby declare the nature of this inven-
tion 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 a belt nulley the rim a of which is pressed out of sheet

page_text: which, Figure 1 is a side elevation, Figure 2 a cross section, Figure 3 a view on an
enlarged scale of a portion of the pulley, and Figure 4 a similar view of a modifi-
cation; Figures 5 and 6 are plan and cross section showing the method of making
the rim a.
The rim as shown in Figures 1, 2 and 3; is formed of thin sheet iron or any
other suitable metal by stamping into dies or swage blocks formed of rings,
with the object of obtaining a completely and exactly circular form provided with
hook-shaped or straight bent over edges b. Figure 3 shows hook-shaped edges.
Figure 4 the straight bent edges.
By this simple method of construction the rim a is rendered extremely light
and firm, and does not require to be turned down owing to the exact circular
form obtained
The attachment of the rim to the spokes and the screwing together of the halves
of the rim takes place in any well known manner
Figs. 5 and show a plan view
and cross section of the shell for making the rim.
The strips a a¹ which at first are of semi-circularly bent sheet metal are placed
round the two inner undivided shell rings ce¹, and then the ing d which is also
divided into two parts is inserted in the grooves c¹, of the shells in such a way that
the joints or parts in contact of the two halves of the rim coincide with the joints or
contact points of the two halves of the ring d d When this has been done the
outer rings which are also not divided are driven on, and the edges b of the
two halves of the rim are flanged over or bent round in any suitable known
manner and method. After the completion of this work the outer rings are
removed and the two halves of the rim together with the halves of the ring d are
drawn together in the direction of the allows from the inner shell rings c, after
which the halves d of the ring may be also easily removed from the rim. The
rim may of course be domed or convex as shown in the drawing or may be made
flat.
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 18.
A belt pulley m (a) which is pressed from iron or other suitable sheet metal
in dies or swage blocks composed of rings and is provided with flanged or bent down
edges (b) with the object of obtaining a completely and exactly circular form for the
belt pulley 11m without it having to be turned, substantially as heieinbefore
described.
Dated this 2nd day of Naramb. 1900
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.