Year: 1887

page_text: Date of Application, 3rd June, 1887
Complete Left, 28th Feb., 1888
Complete Accepted, 29th Mar., 1888
1, HEINRICH EMANUEL LUDWIG, Engineer, residing at Berne, Switzerland, do
hereby declare the nature of this invention to be as follows:-
My invention relates to wheels and pulleys, and its object is to impart to the same
strength and stiffness with economy of material.
For this purpose I construct the wheel or pulley out of two disks of sheet metal,
fixed together in a circle drawn between their outer edge and their central hole, but
ordinarily closer to the former, the said disks having such sectional form as to diverge
from each other on both sides of the said circle. In the middle the disks are pressed
towards each other by screws, or otherwise, so as to put them into a state of tension,
while at the same time they are secured to the nave or the shaft designed to carry
them. By these means wheels and pulleys are obtained which, though being light,
are strong and particularly stiff and therefore free from vibrations.
Preferably the disks are so curved that, when they are united, the outer surface of
the central portion will be convex, while the outer surface of the portion being outside
of their circle of connection is concave.
The rim of the wheel or pulley is secured to the disks in any suitable manner.
If,
in the case of pulleys, it is made of sheet iron, its edges may be folded over those of
the disks, and if a rim having a single groove is required, as in rope-pulleys, the same.
may be formed by the outer portions of the disks themselves.
Dd the T
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page_text: I, HEINRICH EMANUEL LUDWIG, Engineer, residing at Berno, Switzerland, 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 wheels and pulleys, and its object is to impart to the same
strength and stiffness with economy of material.
For this purpose I construct the wheel or pulley out of two disks of sheet metal,
fixed together in a circle drawn between their outer edge and their central hole, but
ordinarily closer to the former, the said disks having such sectional form as to diverge
from each other on both sides of the said circle. In the middle the disks are pressed
towards cach other by screws, or otherwise, so as to put them into a state of tension,
while at the same time they are secured to the nave or the shaft designed to carry.
By these means wheels and pulleys are obtained which though being light, are strong
and particularly stiff and therefore free from vibrations.
Preferably the disks are so curved that, when united, the outer surface of the central
portion will be convex, while the outer surface of the portion being outside of their
circle of connection is concave. The rim of the wheel or pulley is secured to the disks
in any suitable manner. If, in the case of pulleys, it is made of sheet iron, its edges
may be folded over those of the disks, and if a rim having a single groove is required,
as in rope-pulleys, the same may be formed by the outer portions of the disks
themselves.
In the annexed sheet of drawings Fig. 1 shows in transverse section and Fig. 2 in
side view a belt-pulley constructed according to my invention. Fig. 3 is a section of a
spur-wheel and Fig. 4 the end view of the nave thereof. Fig. represents in section a
carrying-pulley for a single rope and Fig. 6 a portion of a rope-pulloy for a number
of ropes.
In Figs. 1 and 2 a a are the two disks, & is the rim and the nave.
The disks are
curved in the form shown by the drawing so that they may be brought into contact
with each other upon the circle d, while the portions inside and outside of this circle
diverge from each other, the inner portions being so curved as to be externally
convex, the outer portions so as to be externally concave. The disks are rivetted
together on the circle d, and after having been slipped upon the body of the nave c,
they are pressed towards each other by means of the annular nutse working on threads
cut upon the nave, the disks being thereby brought into the state of tension by which
the stiffness of the structure is attained. One of these nuts may, however, be replaced
by a projection or flange formed upon the nave. For preventing the disks from
shifting relatively to the nuts e they may be provided with a corrugation projecting
outwardly and engaged by a groove turned into the nuts; and in view of preventing
them from rotating upon the nave, the latter may be cast with feathers g, shown in

page_text: Fig. 4, while into the disks are cut corresponding notches. In Fig. 1 the rim 6 is
supposed to be made of a strip of sheet metal having its edges folded over those of
the disks a.
In case the pulley is to be constructed in two parts as shown in Fig. 2, the two
halves of the disks are connected together by fish-plates h, and the two halves of the
nuts e by dovetail joints; but these connections may be carried out in other suitable
manner.
In the spur-wheel represented by Fig. 3 the nave is provided with a flange i serving
as abutment for the combined disks a, and the disks are pressed towards each other
and against the flange i by means of the ring j and the screw-bolts & passing through
the ring and the flange. Either of the two described modes of connecting together
the disks and the nave may, however be employed in either case. To the rim of the
spur-wheel the disks are secured by means of intermediate pieces and screws m, the
said pieces extending at d between the disks, so that the rivets connecting together
the disks may be passed through them.
The pulley shown by Fig. 5 and designed to serve as carrying-pulley for a rope,
consists of two disks a only, the disks having their outer portion so curved that, on
being united, the groove required for receiving the rope is formed. The disks are
placed without any nave upon the axle a and pressed together against the flange i by
the nut e.
Fig. 6 shows a portion of a rope-pulley for four ropes, the pulley being composed
of two disks a, an intermediate flat disk o and a rim of corrugated sheet metal folded
at its edges over those of the disks a.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
1. In wheels and pulleys, the combination, with a nave or shaft, of two disks a of
sheet metal fixed together in a circle d and diverging from each other on both sides
of the said circle, and means for pressing the disks in the middle towards each other
so as to put them into a state of tension, substantially as and for the purpose
specified.
2. In a pulley, the combination, with a nave or shaft, of two disks a of sheet metal
fixed together in a circle d and diverging from each other on both sides of the said
circle, means for pressing the disks in the middle towards each other, and a rim of
sheet metal having its edges folded over the edges of the disks, substantially as and
for the purpose described.
Dated the Twenty-second day of February 1888.
CARL PIEPER,
Agent for Applicant.