Improvements in or relating to Belt Pulleys.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in or relating to Belt Pulleys.
I, WALTER TURNER of 6 Royal Circus, West Norwood, County of Surrey,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to belt driving pulleys, and the application thereto of
pneumatic tyres. By my improvements I am able to apply the tyre either to a
flat faced pulley or a rounded one, and the invention may be carried out in the.
following manner.
I may use an air tube preferably of pure rubber with an outer cover of canvas
leather or other suitable material, the edges of which are unstretchable, for which
purpose wires, cords, canvas or the like may be employed. To prevent the edges of.
the cover from being drawn inwards upon the pulley I place upon the latter and
preferably attached to the cover rings or distance pieces of any suitable and
sufficiently stiff material say for example kamptulicon, preferably making the
distance pieces not so wide as the pulley so as to leave a recess in which the edge
of the cover can bed.
In another form the edge is carried over the edge of the pulley face, the
distance pieces being used as before, but being preferably nearly or quite as wide as.
the pulley.
In another form two bands of kamptulicon are employed one in each edge of.
the cover, a steel or equivalent band passing round these and serving to hold them
in place. A similar arrangement, but with wires or other non-stretchable edges in.
the cover may be used in the manner first described excepting that the distance
pieces are actually in the edges of the cover. The division in this and other cases.
need not be in the centre.
In the case of a pulley with a rounded face I prefer to place a steel or equivalent.
band in each edge of the cover which may be sprung into the pulley so as to press
into the underside of its periphery. These bands may be carried in extension flaps
and there would also preferably be flaps to fit upon the outer rounded periphery of.
the pulley which may be made of stiff canvas or the like, the air tube being retained
and protected by the cover as before.
The pneumatic pulley faces when inflated assume a flat, concave, or convex, shape.
on their outer surfaces, suitable when fixed to a flat or convex faced pulley to
receive and grip the ordinary flat leather or cotton belts now in use, or metal belts.
may be employed.
The edges of the cover may be carried to the back of the pulley face and secured
by a steel band or wire sprung or tightened thereto, or secured by cement, screws, or
hooks or the edges of the cover cemented or laced to each other.
Dated this 22nd November 1895.
BOULT & WADE,
Agents for the Applicant.

page_text: improvements in or relating to Belt Pulleys.
I, WALTER TURNER of 6, Royal Circus, West Norwood in the County of Surrey,
Engineer, 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 belt driving-pulleys, and the application thereto of
pneumatic tyres or pads. By my improvements I am able to apply the tyre either to
a flat faced pulley or a rounded one, and the invention may be carried out in the
following manner :-
The invention will be best understood by reference to the accompanying drawings,
which are cross sections of portions of rims of flat faced pulleys showing the
application of this invention.
Like letters represent like parts throughout the drawings.
A represents in cross section the rim of the pulley upon which the pneumatic pad
is to be secured. B is a flat tube preferably of india-rubber, into which the air is
forced when the pad is inflated. C is the cover or working face of the pad and may
be formed of any suitable material-canvas for example-faced or not with rubber,
leather or other wearing material. The edges of the cover are stiffened or lined with
a suitable material such as the strips C₁ of kamptulicon, shown in the drawings, and
hereinafter termed stiffeners, these being arranged in Figure 1 so as to meet at the
centre C and lie flat upon the face of the pulley; these stiffeners prevent the edges
of the cover from being drawn inwards upon the pulley, and thus serve to maintain
the tyre of approximately the same width as the pulley, or of such other width as
may be desired. At or near the outer edge of each of these stiffeners C' is an
inextensible hoop or band C³ of wire or other material, the ends of which may be
drawn together by well-known or other tightening devices to retain the tyre securely
upon the wheel.
If desired each edge of the cover can overlap the edge of the pulley face towards
the centre of the pulley, the stiffeners being used as before, but being preferably
nearly or quite as wide as the pulley_face.
In the modification illustrated in Fig. 2, flat metal bands C³ carried in extensions C
of the cover are placed in the pulley so as to bear against the inner side of the rim to
keep the tyre or annular pad in place.
Stiffeners C' of kamptulicon or the like are also employed in this modification to
bear upon the outer periphery of the pulley, as shown, so that each edge of the rim is
gripped between the stiffener C and the band C³, the air tube B being retained and
protected by the cover as before.
In the modification shown in Fig. 3 the edges of the cover are extended to form
flaps C, which overlap the edges of the rim in the manner shown in the drawing,
a ring D secured by screws D' to the rim being held against the flaps so that the tyre
is fixed in place.
The flaps or the cover may be otherwise fixed or secured upon the pulley, for
example by cement, or by lacing the opposite edges of the cover to each other inside
the rim.
The pneumatic pad when inflated assumes a shape on its outer surface suited to
receive and grip flat leather or cotton belts of the type commonly employed; these
pneumatic pulleys are, however, particularly advantageous for use in combination
with metal driving bands or belts.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The application of pneumatic tyres or pads to belt pulleys without alteration of
the pulleys.
2. A pneumatic tyred or padded belt pulley adapted to receive ordinary flat
belting.
3. The combination of a pneumatic tyred belt pulley and a metal driving band
or belt.
4. In a pneumatic tyre or pad for belt pulleys the employment of stiffeners
such as C to maintain the tyre of approximately the same width as the pulley.
5. In a pneumatic tyre or pad for belt pulleys the combination with stiffeners such
as C of inextensible hoops or edges such as C3.
6. A complete tyre or pad for a belt pulley substantially as described and illustrated
in Figure 1 or Figure 2 or Figure 3 of the accompanying drawings.
Dated this 28th day of September 1896.
BOULT & WADE,
Agents for the Applicant.