IMPROVEMENTS IN BELTS FOR DRIVING MACHINERY AND THE LIKE
Year: 1884

page_text: TRUVIDIONAL
SPECIFICATION.
I, WILLIAM PHILLIPS THOMPSON Fel Inst P. A. of the Agency for Foreign Patent
Solicitors 6, Lord Street. Liverpool in the county of Lancaster and 323 High
Holborn in the County of Middlesex Civil Engineer do hereby declare the nature
of the said invention for "IMPROVEMENTS IN BELTS FOR DRIVING MACHINERY AND
THE LIKE" (a communication from abroad by C. Otto Gehrckens of Hamburg in
the Empire of Germany Belt Manufacturer) to be as follows:-
The invention relates chiefly to improvements in crossed or half crossed driving
belts, though it is applicable to belts for use in other situations and the object of
these improvements is to thicken such belts in part lengthways.
The outer edge of half crossed belts becomes longer than the inner one when
common belts are used, as the radius of the curve described by the outer edge is
longer than the radius described by the inner edge. To prevent such inconvenience
and to obtain an equal tension on both edges of the belt, according to this invention
the belt is so constructed as to increase the radius of that part of the pulley,
whereon the inner edge of the belt is running by placing lengthways one two or
more strips of the belting material under the inner edge of the belt until the
tension on both edges of such belt is equalized.
When conical pulleys arranged by pairs in such a manner as to bring the smallest
diameter of the one opposite to the largest diameter of the other one are driven by
open belts, belts double or nearly double the ordinary width are used, the thicken-
ing atrips being placed along the centre line of such belts; one edge of the belt
will thereby run freely without or by slightly touching the pulley, while that
surface of the belt which is necessary for transferring the power is kept in proper
contact with the pulley.
Conical pulleys when arranged in the above described manner, but driven by
erossed belts require belts with thickening strips at one edge of the belt, as the
thickening strip equalizes the diameters of the opposite parts of such conical
Dulleys.

page_text: When shafts, which may or may not be at right angles, but in or near the same
plane are driven by running the belt on four or more pulleys, both the edges of the
belt have to take a longer course than its centre a thickening strip is therefore
placed beneath such centre line, thereby equalizing the velocity of all parts of
the belt.
BOIL
3001
COMPLETE SPECIFICATION.
16
I WILLIAM PHILLIPS THOMPSON, Fel. Inst. P. A. of the Agency for Foreign
Patent Solicitors, 6 Lord Street, Liverpool, in the County of Lancaster, and
323 High Holborn, in the County of Middlesex, Civil Engineer, do hereby declare
the nature of the said invention for IMPROVEMENTS IN BELTS FOR DRIVING
MACHINERY AND THE LIKE" (a communication from abroad C. Otto Gehrckens,
Hamburg) and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
The invention relates chiefly to improvements in crossed or half crossed driving-
belts, though it is applicable to driving belts used in other situations, and the
object of these improvements is to thicken such belts in part lengthways.
The outer edge of half crossed belts becomes longer than the inner one when
common belts are used as the radius of the curve described by the outer edge is
longer than the radius described by the inner edge. To prevent such inconvenience
and to obtain an equal tension on both edges of the belt, according to this invention
'the belt is constructed so as to increase the radius of that part of the pulley,
whereon the inner edge of the belt is running by placing lengthways one, two or
'more strips a of the belting material under the inner edge of the belt, as it is
illustrated in Figure 1 of the accompanying drawing, until the tension on both
edges of such belt is equalized.
When conical pulleys arranged by pairs in such a manner as to bring the smallest
diameter of the one opposite to the largest diameter of the other one are driven by
open belts, as shown in Figure 2 and 2*, belts double or nearly double the ordinary
width are used the thickening strip al being placed along the centre-line of such
belts; one edge of the belt will thereby run freely without or by slightly touching
the pulloy while that surface of the belt, which is necessary for transferring the
power, is kept in proper contact with the pulley.
Conical pulleys when arranged in the above described manner, but driven by
crossed belts, as illustrated by Figure 3, 3 and 3b, require belts with thickening

page_text: strips a at one edge of the belt, as the thickening strip equalizes the diameters of
the opposite parts of such conical pulleys.
When shafts, which may or may not be at right angles, but in or near the same
plane are driven by running the belt on four or more pulleys, as it may be seen in
Figure 4 and 4*, both the edges of the belt have to take a longer course than its
centre; a thickening strip a' is therefore placed beneath such centre-line, thereby
equalizing the velocity of all parts of the belt.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed, as communicated
to me by my foreign correspondent, I declare that what I claim is
1st. In combination with a driving belt, one, two or more thickening strips a
placed beneath one edge of the belt, substantially as and for the purpose specified.
2nd. In combination with a driving belt, one, two or more thickening strips a¹
placed beneath the centre line of the belt, substantially as and for the purpose
specified.