Year: 1899

page_text: I, FRITZ ROHRBECK, of St. Veit on the Triesting, Lower Austria, Manufacturer,
do hereby declare the nature of this invention to be as follows:-
-
This invention has for object the construction of light belt-pulleys with very
stiff rims and arms.
For this purpose both the rim and the arms of a belt-pulley according to this
invention are formed by double sheet-metal strips or pieces of band or strip
iron, of which those forming the rim are stiffened by one or more groove-like
and surrounding pressed-out portions of the inner strip, and are connected to-
gether by turning over the longitudinal edges of the outer strip, whilst the
sheet-metal strips or pieces of band or strip iron that form the arms and which
are provided with flanged edges to increase their strength, form the opening of
the hub or boss and are connected together in pairs, and also with the ends of
the rim strips projecting in between them, by screw or bolt devices.
The screw or bolt devices enable the belt-pulleys to be quickly mounted and
securely fastened direct on the shafts, with or without keys, and also allow the
pulleys to be easily and quickly removed and taken to pieces.
Figs. 1 to 4 of the accompanying drawings show by way of example a bipartite
belt-pulley according to this invention, Fig. 1 being half an elevation and half
a vertical section thereof, and Figs. 2 and 3 being a vertical axial and a hori-
zontal central section thereof respectively. Fig. 4 is a cross section through
the screw or bolt device of the sheet-metal strips or pieces of strip or band iron
forming the arms and corresponds to the line A B of Fig. 1. Fig. 5 represents
a bolt device for enabling a key to be used for connecting the arms with the
shaft.
The rim of the belt-pulley consists of two halves, each of which is formed
of two sheet-metal strips or pieces of strip or band iron a, b. The inner strip a
is bent semicircularly in a female die, and, with the exception of the two ends,
which project out of the female die and are left plain, is simultaneously provided
with one or more groove-shaped swellings c, which run in the direction of the
longitudinal axis of the strip and stiffen it. The outer and broader strip bis
put into a second female die, bent semi circularly therein, and simultaneously
turned up at the longitudinal edges; upon this the first mentioned strip is
laid and the turned up edges d are bent down upon the inserted strip, so that
they embrace the longitudinal edges of the inserted strip and the two strips
are firmly connected together. On the subsequent connexion with one of the
two sheet-metal strips or pieces of strip or band iron forming the arms, the pro-
jecting plain ends e of the inner strip are bent down upon the arm strips.
The arms consist, as stated, of two sheet-metal strips or pieces of strip or
band iron f, each of which is flanged at its longitudinal edges g, and, at the
same time, in the middle part h and in accordance with the half diameter of the

page_text: shaft on which the belt-pulley is to be fastened, provided with a hollow or
depression corresponding to the half of the opening of the hub or boss. In the
sheet-metal strips or pieces of band or strip iron f a depression is also made near
each of its ends in order to form steps of a height equal to the thickness of
the rim strips a, so that the ends of the strip a, which are laid upon these steps
when the arm strip f is connected with the rim, form a smooth surface with the
arm strips.
For connecting the two sheet-metal strips or pieces of band or strip iron f
with each other and with the inserted ends of the rim strips, screw bolts are
provided whose heads and nuts bear against cup-shaped pressed-out supporting
pieces whose object is to place the heads and nuts so high between the flanges g
that a screw-key can be easily applied.
By screwing up the nuts not merely are the arms firmly connected with the
rim, whose outer strips b thereupon abut smoothly against each other with their
transverse edges, but the pulley is also securely fastened on the shaft inserted
in the opening of the hub or boss.
If the connexion is to be effected by means of a key m (Fig. 5) a flat iron
piece is inserted between the sheet metal strips or pieces of strip or band
iron f, which in this case are also provided with steps n, and is fastened by
means of the screw-bolt k, which leaves the key-way free.
In lieu of making the rim of two pairs of strips as described and shown, it
may be made of only one pair of strips.
This 6th day of T1900
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.
I, FRITZ ROHRBECK, of St. Veit on the Triesting, Lower Austria, Manufacturer,
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 object the construction of light belt-pulleys with very
stiff rims and arms.
For this purpose both the rim and arms of a belt-pulley according to this
invention are formed by double sheet-metal strips or pieces of band or strip
iron, of which those forming the rim are stiffened by one or more groove-like
and surrounding pressed-out portions of the inner strip, and are connected to-
gether by turning over the longitudinal edges of the outer strip, whilst the
sheet-metal strips or pieces of band or strip iron that form the arms and which
are provided with flanged edges to increase their strength, form the opening of
the hub or boss and are connected together pairwise, and also with the ends of
the rim strips projecting in between them, by means of screw or bolt devices.
The screw or bolt devices enable the belt-pulleys to be quickly mounted and
securely fastened direct on the shafts, with or without keys, and also allow
the pulleys to be easily and quickly removed and taken to pieces.
Figs. 1 to 4 of the drawings filed with my Provisional Specification show by
way of example a bipartite belt-pulley according to this invention, Fig. 1 being
half an elevation and half a vertical section thereof, Figs. 2 and 3 respectively a

page_text: vertical axial and a horizontal central section thereof, and Fig. 4 a cross-section
through the screw or bolt device of the sheet-metal strips or pieces of strip or
band iron forming the arms and corresponding to the line A B of Fig. 1. Fig. 5
represents a bolt device for enabling a key to be used for connecting the arms
with the shaft.
The rim of the belt-pulley consists of two halves, each of which is formed
of two sheet-metal strips or pieces of strip or band iron a, b. The inner strip a
is bent semi-circularly in a female die, and, with the exception of the two ends,
which project out of the female die and are left plain, is simultaneously provided
with one or more groove-shaped swellings c, which run in the direction of the
longitudinal axis of the strip and stiffen it. The outer and broader strip is
put into a second female die, and bent semi-circularly therein and simultaneously
turned up at the longitudinal edges; upon this the first mentioned strip is
laid and the turned up edges d are bent down upon the inserted strip, so that
they embrace the longitudinal edges of the inserted strip and the two strips
are firmly connected together. On the subsequent connection with one of the
two sheet metal strips or pieces of strip or band iron forming the arms, the pro-
jecting plain ends e of the inner strip are bent down upon the arm strip.
The arms consist, as stated, of two sheet-metal strips or pieces of strip or
band iron f, each of which is flanged at its longitudinal edge g, and, at the
same time, in the middle part h and in accordance with the half diameter of the
shaft on which the belt-pulley is to be fastened, provided with a hollow or
depression to form half of the opening of the hub or boss. In the sheet-metal
strips or pieces of band or strip iron fa depression is also made near each of its
ends in order to form a step i of a height equal to the thickness of the rim
strips a, so that the ends of the strip a, which are laid upon these steps when
the arm strip f is connected with the rim, form a smooth surface with the arm
strips.
For connecting the two sheet-metal strips or pieces of band or strip iron f
with each other and with the inserted ends of the rim strips, screw-bolts k are
provided whose heads and nuts bear against cup-shaped stamped-out pieces
whose object is to place the heads and nuts high enough between the flanges g
that a screw-key can be easily applied.
b
By screwing up the nuts not merely are the arms firmly connected with the
rim, whose outer strips 6 thereupon abut smoothly against each other with their
transverse edges, but the pulley is also securely fastened on the shaft inserted
in the opening of the hub or boss.
If the connexion is to be effected by means of a key m (Fig. 5) a flat iron
piece p is inserted between the sheet-metal strips or pieces of strip or band
iron f, which in this case are also provided with steps n, and is fastened by
means of screw-bolts k, which leaves the key-way free.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. A belt-pulley whose rim consists of two pairs of sheet-metal strips or
pieces of band or strip iron a and b the inner of which is provided with one or
more groove-shaped swellings serving for stiffening and is held fast to the outer
strip by its bent-over longitudinal edges, whilst the arms consist of sheet-metal
strips or pieces of band or strip iron f, which are bolted together pairwise and
also to the bent-in ends of the rim-strip or rim-strips a and which are provided
with bent-up and stiffening longitudinal edges g and with hollows or depressions
corresponding to the hub-opening.
2. In a belt-pulley according to the preceding claim, the arrangement of a
key-way in the arms, whose strips for this purpose are stepped near the hub
opening and hold fast a flat iron piece that partly fills up the interspace between
these steps.

page_text: 3. A belt-pulley constructed substantially as herein before described with
reference to and shown in Figs. 1 to 4 inclusive of the drawings filed with my
Provisional Specification whether modified or not according to Fig. 5 thereof.
Dated this 2nd day of October 1899.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.