Year: 1898

page_text: I, ROBERT MACHOLD, of Mähr-Ostrau, Moravia, Austria, Works Manager, do
hereby declare the nature of this invention to be as follows;-
This invention relates to improvements in wooden pulleys for belt and rope
gearing and has for its object to so construct these pulleys of bent wood that glued
or cemented joints are entirely dispensed with and they are rendered suitable for
use in damp as well as in dry situations.
This is accomplished by connecting the nave and rim by means of sector-shaped
frames of bent wood, the arc-shaped middle parts of which are screwed to the
inner side of the rim while the ends of the radial members meet at the nave and
are screwed to the corresponding members of the adjacent sectors each pair of
radial members thus united forming a spoke. The ends of these spokes are clamped
between a flange on the nave and a loose collar slipped thereon, the two being
solidly united by means of screw-bolts.
Belt and rope pulleys with one or more systems of spokes may be thus con-
structed at little cost and, compared with the wooden pulleys hitherto known, are
very strong and light, particularly towards the rim, so that they are especially
adapted for high speed, since the bursting of the pulley is rendered almost
impossible.
The accompanying drawings represent in side view and cross section respectively,
a pulley constructed as above described, with two systems of spokes and intended
for broad belts.
The wooden strips a of which the spokes are formed are bent into the form of
sectors, the middle arc-shaped parts a of which are fixed to the rim b by means
of screw bolts s countersunk in the face of the rim, while the ends of the members
extending radially to the nave c are enlarged so as to meet and form radial joints
as at a² in the centre line of the sectors, the radial members of each of two adjoin-
ing strips a being fastened together by means of screw bolts s¹ each pair of mem-
bers thus united forming one spoke. The ends thus jointed together and fitting
around the circumference of the nave are tightly clamped between a flange c¹ cast
on the nave and a loose collar or disc 2 slipped on to the nave, the collar and flange
being securely united by screw bolts 2 which pass through the joints and there-
fore through each of the two halves of the heel ends of the spokes at their meeting
point so as to make a strong and rigid structure and a firm connection between
the nave and the spokes. The flanges c¹ may be radially serrated and as well as the
collars slightly undercut so as to make a slightly dovetailed connection with
the ends of the spokes.
The rim consists of bent wood which has previously been subjected to a process

page_text: of heating and the said rim may be straight and, in case of having one system of
spokes, of an arched shape in cross section.
Dated this 2nd day of December 1898.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.
I, ROBERT MACHOLD, of Mähr-Ostrau, Moravia, Austria, Works Manager, 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 relates to improvements in wooden pulleys for belt and rope
gearing and has for its object to so construct these pulleys of bent wood that glued
or cemented joints are entirely dispensed with and they are rendered suitable for
use in damp as well as in dry situations.
This is accomplished by connecting the nave and rim by means of sector-shaped
frames of bent wood, the arc-shaped middle parts of which are screwed to the
inner side of the rim while the ends of the radial members meet at the nave and
are screwed to the corresponding members of the adjacent sectors each pair of
radial members thus united forming a spoke. The ends of these spokes are clamped
between a flange on the nave and a loose collar slipped thereon, the two being
solidly united by means of screw-bolts.
Belt and rope pulleys with one or more systems of spokes may be thus con-
structed at little cost and, compared with the wooden pulleys hitherto known, are
very strong and light, particularly towards the rim, so that they are especially
adapted for high speed, since the bursting of the pulley is rendered almost
impossible.
The drawings accompanying the Provisional Specification represent in side view
and cross-section respectively, a pulley constructed as above described, with two
systems of spokes and intended for broad belts.
$
The wooden strips a of which the spokes are formed are bent into the form of
sectors, the middle arc-shaped parts a of which are fixed to the rim by means
of screw bolts » countersunk in the face of the rim, while the ends of the members
extending radially to the nave c are enlarged so as to meet and form radial joints
as at in the centre line of the sectors, the radial members of each of two adjoin-
ing strips a being fastened together by means of screw bolts s¹, each pair of mem-
bers thus united forming one spoke. The ends thus jointed together and fitting
around the circumference of the nave are tightly clamped between a flange e' cast
on the nave and a loose collar or disc slipped on to the nave, the collar and flange
being securely united by screw bolts which pass through the joints and there-
fore through each of the two halves of the heel ends of the spokes at their meeting
point so as to make a strong and rigid structure and a firm connection between the
nave and the spokes. The flanges c¹ may be radially serrated and as well as
the collars slightly undercut so as to make a slightly dovetailed connection with
the ends of the spokes.
The rim consists of bent wood which has previously been subjected to a process
of steaming and the said rim may be straight and, in case of having one system of
spokes, of an arched shape in cross section.

page_text: 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:
The construction of belt and rope pulleys of wooden strips a bent into the shape
of a sector, the arc-shaped middle part a of which is connected, as part of the
spokes, to the rim 6 by means of screw bolts s and the radially-extending end
members of which are fastened together in pairs by screw bolts so as to form
of each pair one spoke, and being, at their ends a jointed together and fixed
around and to the nave by being clamped between a flange cand loose disc or
collar on the nave c by screws se passing through the heel ends of the strips and
also through the said flanges substantially as shewn and described.
1
1000
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.