IMPROVEMENT IN DRIVING BELTS AND ROPES
Year: 1885

page_text: I, HERBERT JOHN HADDAN, of 67, Strand, in the City of Westminster, Civil
Engineer, do hereby declare the nature of said invention for IMPROVEMENT IN
DRIVING BELTS AND ROPES, a communication to me from abroad by Friedrich
Wegmann, Engineer, of Zürich, Switzerland, to be as follows:-
This improvement has for its object to prevent or to reduce the sliding of the
straps on the pulleys, without using artificial means, such as adhesive paste.
For the said purpose I use a strap, having twice the length of the hitherto used
straps, such a strap being laid in a spiral line so as to form a double layer, and the
two ends are joined either by means of a buckle, passing round the middle part, or
by perforating the middle part of the strap between the two ends and connecting
the latter through the perforations, so as to form at this part a crossing of the two
strap layers.
The strap forms, by this arrangement and manner of joining, a double loop, the
inner layer of which can contract, when the outer layer is stretched, but not
inversely.
The two ends may be formed into tongues, passing through the perforation of
the middle part and stitched together, or they may be connected by one or more
parallel strings passing through one or more perforations of the strap or by other
suitable means.
The same type or shape and method of connection may be adapted for metallic
bands and endless ropes or strings.
100

page_text: improvement in Driving Belts and Ropes.
I, HERBERT JOHN HADDAN, of 67 Strand, in the County of Middlesex, Civil
Engineer, do hereby declare the nature of this invention, a communication to me
from abroad by Friedrich Wegmann, of Zürich, Switzerland, and in what manner
the same is to be performed to be particularly described and ascertained in and by
the following statement:-
This improvement has for its object to prevent or to reduce the sliding of the
straps on the pulleys, without using artificial means, such as adhesive paste.
For the said purpose I use a strap, having twice the length of those hitherto
used, such a strap being laid in a spiral line so as to form a double layer, and the
two ends a and b (see Fig. 1 of the annexed drawings) are joined either by means
of a buckle or shackle passing round the middle part, or by perforating that part
of the strap which is situated in the middle between the two ends and connecting
the latter through the perforations so as to form at this part a crossing of the two
strap layers.
The compound strap forms, by this arrangement and manner of joining, a double
loop, the inner layer of which can contract, when the outer layer is stretched, but
not inversely.
In using this double loop as a strap, the shortenings and lengthenings take place
because the outer layer of the strap has a larger diameter, and therefore makes a
longer travel within a given time, than the inner layer. In consequence, an
alternate pulling and pushing of the two strap layers lying over each other takes
place, whereby the inner layer of the strap tends continuously to shorten, while
the outer layer, which covers the inner layer-as far as the pulleys are in contact
with the strap, retains this contraction, owing to the considerable adhesion between
the two layers. A continuous and automatic tension is thus produced, which
imparts to the strap the highest amount of tractive power, even when the strap is
loose or loosens itself on the pulley.
The ends of the straps may be joined by any metallic pieces, but preferably by
strings or strips of leather or guts. Broad straps may be provided with several
perforations side by side, or the opening is to be made about half the width of
the strap, and the ends of the strap are proportionally narrowed, laid over each
other and sewn and riveted or otherwise joined together. The perforations in the
middle part of the strap must be long enough, for allowing the strap to produce
the necessary compensating slip or motion.
In the annexed drawing, Fig. 2 shows an arrangement of compound straps,
where the ends are joined by a sort of buckle across the middle part. The joining
buckle may be made of metal, leather, guts or any other suitable material.
Fig. 3 shows the joining of a broad strap with a large perforation and with the
ends laid over each other and joined together. Figs. 4, 5 and 7 show the joining of
the ends of a narrow strap by means of a perforation and strings, guts or other
ties passing through the same.
Fig. 6 shows the joining of the ends of a wide strap by means of several
perforations and strings.

page_text: This arrangement is also applicable to cord-or rope driving and to driving
bands of metal or other material.
Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed, I declare that what
I claim is
A driving belt, coiled spirally so as to forin a double layer, and made endless by
drawing one layer through the other, either by means of a shackle, or by means of
perforations and narrowed ends or connecting strings, so that the two layers cross
each other, the same arrangement being repeated, if desired.
1
P T
1000
H. J. HADDAN.
By Herbert & Co., Agents.