Improvements in Band Pulleys or Drums.
Year: 1892

page_text: Date of Application, 3rd Dec., 1892
Complete Specification Left, 4th Sept., 1893-Accepted, 7th Oct., 1893
PROVISIONAL SPECIFICATION.
Improvements in Band Pulleys or Drums.
HENRY IVAN GOULD 115 Falmouth Road, Surrey Engineer, JAMES WILLIAM
BENNETT 41 Eastcheap, London, E.C. Advertisement Contractor, do hereby
declare the nature of this invention to be as follows:-
A pulley or drum the face of which has a series of narrow grooves cut into it
and running from edge to edge at equal and certain distances from each other as
may be found most expedient according to the different sizes of the pulleys.
These grooves have their edges "rounded off" so as to prevent cutting or tearing
of the band or belt.
The spaces between these grooves instead of following what would be the
circumference of a true circular pulley are also slightly hollowed out across the
face of the pulley or drum and towards its centre or may be flat or slightly convex
as may be required.
The whole outline of our pulley thus has the appearance of a series of concave
flat or convex faces intersected by narrow grooves which effectually prevent the
slipping of the band or belt and enabling the whole power of the engine to be
utilised.
Dated this Third dox of December 1892
H. I. GOULD.
J. W. BENNETT.
COMPLETE SPECIFICATION.
Improvements in Band Pulleys or Drums.
We, HENRY IVAN GOULD of 115 Falmouth Road in the County of Surrey
Engineer, and JAMES WILLIAM BENNETT of 41 Eastcheap, in the City and
County of London, Advertisement Contractor 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 :-
Our invention relates to certain improvements in pulleys or drums for the
transmission of power, and has for its object the prevention of loss of power by
slipping, and also to dispense with the use of bitumenous or other compounds used
for this purpose to the deterioration of the belt.
In order to render our said invention perfectly clear we have appended the
accompanying sheet of drawings in which
Figure 1 represents a front elevational view of the wheel or drum, and Figure 2
is an end elevation thereof.
Figure 3 is a view in projection of a portion of a rim or face of a wheel pulley
or drum, shewing the details of the invention fully.
In carrying our invention into effect we do not construct the pulley or drum of
circular cross section, using instead any suitable polygonal outline, and the face
may be convex or flat in cross section. Between each of the faces of the polygon, we
form a groove, the incident edges of which are rounded or chamfered to prevent
cutting or abrasion of the belt.
Referring to the appended drawings,
Figure 1 shews the pulley or drum in elevation, and the grooves a and the series
of concave sides b are fully shewn thereon.
Figure 2 represents an end elevation thereof, and the disposition of the grooves
and surfaces are shewn in detail by the projected view Figure 3.

page_text: We find in practice that pulleys or drums made according to our invention tend
to minimise slip" and the consequent loss of power, by affording mechanical
adhesion between the face of the pulley or drum and the belt or strap driven by or
driving it. Any kind of adhesive compound as at present used to prevent the
slipping of driving or driven belts must result in the deterioration of said belts by
reason of the disintegration of the inner surface, and consequent expansion, while
the outer surface maintains relatively its linear dimensions.
When, however, the pulley or drum is shaped to conform to the requirements of
the belt, and to transmit the power without loss by slipping, and without damaging
the belt by unequal strains; it is evident that the conformation of the periphery
of the pulley or drum, an important factor in the transmission of power, and
the essential feature of our said invention consists in the modification of said
peripheries for the purposes herein set forth.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is ;-
First. In a pulley or drum for the transmission of power, the use of a special
construction of periphery, wherein a polygonal periphery is forined, with transverse
grooves between and separating each face of the polygon; substantially as herein
described with reference to the appended drawings.
Second. In a pulley or drum for the transmission of power, the use of a special
construction of periphery, wherein certain grooves are formed or cut transversely
across the face thereof substantially as herein described-with reference to the
drawings.
Third. In a pulley or drum for the transmission of power, the use or employment
of a polygonal periphery, with dividing grooves, substantially as herein described,
and shewn by the drawings.
Dated this 30th day of August 1893
H. I. GOULD.
J. W. BENNETT.