IMPROVEMENTS IN PULLEYS OR DRUMS
Year: 1884

page_text: I JOHN HENRY BODDY of 42 Hillary Street Leeds in the County of York
Engineer do hereby declare the nature of my invention for IMPROVEMENTS IN
PULLEYS OR DRUMS to be as follows:-
It is well known that the great difficulty when driving pulleys or drums by
friction when the drums are on shafts running in fixed bearings, arises from the
fact of the contact of such drums or pulleys not being even or regular. Now my
invention obviates these defects by using a pulley or drum with a spring of India
rubber or steel or other suitable material placed inside the rim or face of such
pulley or drum and connected to both the outer rim and the inner portion by any
suitable means.
The object being to secure an elasticity and a motion when
required from and towards the centre. The springs may be of various shapes
& strengths to suit circumstances and may be used to great advantage when
transmitting power by means of belts and other materials.

page_text: I JOHN HENRY BODDY of 42 Hillary Street Leeds in the County of York
Engineer do hereby declare the nature of my Invention for IMPROVEMENTS IN
PULLEYS OR DRUMS and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :—
The object of my invention is to make a Pulley or drum with an Elastic or
yielding material between the rim and the hub or boss. Pulleys of this nature
are of great utility in transmitting power by frictional contact of one druin against
another or when used with belting ropes or other similar material.
In the former
case they insure a regularity of contact between the drums and in the latter case
they reduce the noise and vibration of machinery. In consequence of their yielding
or elastic qualities they also reduce the wear and tear of belting &c.
The Elasticity may be secured by various methods. Either by using plates or
strips of steel or other suitable metal in the shape of spokes or springs or by
means of India rubber.
One method of carrying out my invention consists in using a rim of metal of a
T section. The flange being used to connect the flexible spokes. The end of one
spoke is fastened to one side of the rim flange and the other end of the said spoke
is secured to the reverse side of the boss flange. The spokes are given sufficient
length to secure the required amount of elasticity. The spokes are fitted in this
manner alternately & inay be secured by any suitable means. The elge of the
elastic spokes in this case are placed so that they cause the least resistance to
the air when revolving. I also place the spokes with the edge the reverse of the
above but when doing so I find it necessary to cover the spokes with a disk at
each side of the pulley. These disks act both as stays to the rim and also as a
wind guard. The disks are fastened to the rim only and are some distance off the
hub thus allowing the rim to give as required. The spring spokes are fastened to
the hubs provided with short arms. One of these arms is prolonged in order to
connect a flexible stay between it and the rim so as to keep the rim from turning
round on the hub. Another method of carrying out my invention is to take say
an ordinary pulley and place the rim of a larger diameter outside it. In the space
between them I place springs of various shapes to suit circumstances.
strengthen the outer rim if required I place a disk at each side of the pulley as
illustrated. In this space I may place India rubber instead of steel springs, but
in the latter case the outer rin will require to be connected with a stay to prevent
it turning without the hub portion. Another method of carrying out my invention
is to use a boss having four or more arms cast on it. These arms are fitted with
holes in the ends. Through each hole and fitted to the rim of the pulley I.place
stays having at their ends spiral springs. The springs are kept from leaving the
stays by a nut or other suitable means. These pulleys require a couple of disks
as before mentioned to keep the rim in its place. In my illustration the disks are
not shewn so that the details may be seen.
In order to
My drawings illustrate various methods of placing the springs which will be
readily understood.
DESCRIPTIONS OF DRAWINGS.
Figure 1 is the side elevation and Figure 2 is the half section of a nulley

page_text: on the boss to which the other ends of the spokes are fitted. Figure 3 in the side
elevation and Figure 4 is the half section of another pulley. A is the rim. O the
arms on the boss. D the elastic spokes. This method requires the stay marked E
to keep the rim from turning on the hub.
Figure 5 is the side elevation and Figure 6 is the half section of a pulley
constructed by another method.
The outer rim A is connected to the inner portion B by the springs as shewn
at C and D. The Disk E acts both as a wind guard and a stay to the rim.
The
disks E are fastened to the rim but are not connected to the boss from which they
are some distance in order to allow the springs full play.
Figure 7 is the side elevation of another drum.
This system requires a disk at each side as shewn in Figure 5 to keep the rim
in its position. The disks are not shewn so as to more fully illustrate the details.
A is the rim. E are the eye bolts fitted to the rim. F are stays passing through
holes in the Arms C. D are spiral springs to give the required elasticity.
Figures 8 to 11 illustrate several methods of placing the flexible spokes. the ends
of which may be fastened by any suitable means.
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:
First. The construction of pulleys or drums having spokes formed of elastic
strips of metal placed in various positions substantially as described.
Second. The construction of spring pulleys or drums having a space between
the outer rim and the inner portion of the pulley fitted with springs of metal or
India rubber substantially as described.
Third. The construction of spring pulleys or drums having moveable stays fitted
with spiral springs and connected to the boss of the pulley or drum substantially
as described.
Fourth. The construction of spring pulleys or drums having a yielding or
springing action substantially as herein before described and illustrated in the
drawings annexed,
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