IMPROVE- MENTS IN BELT DRIVING PULLEYS
Year: 1884

page_text: PROVISIONAL SPECIFICATION,
I ARTHUR COLLINGS WELLS of the City of Manchester, in the County of
Lancaster, Engineer, do hereby declare tho nature of said invention for "IMPROVE-
MENTS IN BELT DRIVING PULLEYS," to be as follows:-
Pulleys for belt driving are commonly made with cast iron rims, or if made of
wrought iron are formed with straight plain rims.
The object of my invention is to obtain belt driving pulleys of great strength
and of little weight.
Aly invention consists in constructing the rims of belt driving pulleys of thin or
I other sheets or bars of malleable metal, rolled, forged, bent, or otherwise formed,
with edge flanges to give strength and sometimes with bends or internal flanges,
to give additional strength, when desired, this mode of construction imparting
considerable strength and stiffness to the rim with but little metal.
The said rims are or may be formed as described in one or in several pieces and
are or may be made in one complete pulley or so as to be put together in two
halves, or made with a split or opening to get the pulley on the axis or shaft which
split or opening is then closed and the two ends are securely connected.
The said rims, constructed as above described are mounted upon or secured to
armis connected with a central boss, in any convenient manner but by preference
and according to my invention the said improved rims are mounted on and secured
to malleable tubular arms, the outer end of each arm being divided and bent to
form two ears, through which one or more rivets pass to secure the rim to the
arms, the inner ends of which are cast or otherwise secured in a central boss bored
out to fit the axis or shaft for the pulley.

page_text: I ARTHUR COLLINGS WELLS, of the City of Manchester, in the County of
Lancaster, Engineer do hereby declare the nature of said invention for IMPROVE
MENTS IN BELT DRIVING PULLEYS, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
Pulleys for belt driving are commonly made with cast iron rims or if made of
wrought iron are formed with straight plain rims.
The object of my invention is to obtain belt driving pulleys of great strength
and of little weight.
My invention consist in constructing the rims of belt driving pulleys of thin or 1
other sheets or bars of malleable metal, rolled, forged, bent or otherwise formed
with edge flanges to give strength and sometimes with bends or sharp indentations
or grooves to give additional strength when desired, this mode of construction
imparting considerable strength and stiffness to the rim with but little metal.
The said rims are or may be formed as described in one or in several pieces and 1
are or may be made in one complete pulley or so as to be put together in two
halves, or made with a split or opening to get the pulley on the axis or shaft which
split or opening is then closed and the two ends are securely connected.
The said rims, constructed as above described are mounted upon or secured to.
arms connected with a central boss in any convenient manner, but by preference:
and according to my invention the said improved rims are mounted on and secured
⚫ to malleable tubular arms, the outer end of each arm being divided and bent to
form two cars, through which one or more rivets pass to secure the rim to tho
arms, the inner ends of which are cast or otherwise secured in a central boss bored
out to fit the axis or shaft for the pulley.
Fig 1 is a side sectional view and fig 2 an edge sectional view of a belt pulley
constructed according to my invention. These views represent a pulley having a
rim a with side flanges a¹ bent or turned towards the axis of the pulley.
Several modes of carrying the rim and attaching it to the arms or spokes are
illustrated.
One mode is by hollow or tubular spokes of malleable iron cast or otherwise
secured in the central boss c at one end with the other end divided into two and
flattened out to form two cars b' to which the rim a is secured by two or more
rivets.
Another mode is by tubular spokes 6 and a cap b³ having lugs 6 made of
malleable iron by preference-The exterior of the end of the hollow spoke b¹ is
slightly reduced to fit the cap b' and then a slightly coned plug 65 is driven into
the end of the hollow spoke bi to expand it against the interior of the cap.
The inner end of the spoke b is cast in the boss c, or holes are formed in the
latter slightly less than the exterior of the inner end of the tubular spoke, and
the boss c is heated and shrunk on the end of the spoke.
According to another arrangement solid spikes 6 are used with malleable iron
caps 6 shrunk on the end of the outer end of the spoke, the inner end of which is
secured in the boss c by either of the methods above referred to. The rims α of
my improved belt pulleys are formed with the cross sections shown in figs 1
and 2-that is with flanges at at the edges turned down towards the axis, and with
these edge flanges (a¹) combined with a sharp indentation or groove (a³) in the
centro by preference (figs 3 and 4) or with a sharp indentation or groove a'

page_text: without the edge flanges (fig 5) which give additional strength and stiffness. When
the central sharp indentation or groove a² is bent in the direction illustrated by
fig 3 the rivet heads which secure the rim a to the arms or spokes are arranged to
come into the groove formed by the indentation and this groove on the exterior
of the drum is or may be filled up with plaster or other suitable material to make
the surface uniform to prevent the belt from slipping.
In some cases the central bend or indentation or groove a³ as in fig 4 is outwards
and then serves to keep the belt in the centre of the pulley when working.
In figs 1 and 2 the pulley as illustrated is formed in two halves secured together
by bolts when on the shaft.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
1. The construction of the rims of belt pulleys of malleable metal with edge
flanges (a) turned towards the centre of the pulley and with edge flanges (a²)
combined with one or more sharp indentations or grooves (a³) to add strength, or
with sharp indentations or grooves (a) alone without edge flanges (a¹) substantially
as hereinbefore described and illustrated by the drawings.
2. The construction of tubular arms or spokes for belt pulleys and the com-
bination of the same with malleable metal rims substantially as heroinbefore
described and illustrated by the drawings.
Dated this fourth day of December 188A