Year: 1888

page_text: Date of Application, 19th Jan., 1888
Complete Specification Left, 29th Sept., 1888
Complete Specification Accepted, 16th Nov., 1888
We CHARLES AUGUSTE THURON Engineer and VICTORIEN LOUIS MARIE RENARD
Mechanician both of 1 Boulevard St. Denis Paris France, do hereby declare the
nature of this invention to be as follows:-
For the purpose of transmitting motion from one pulley or wheel to another, one
or other of two methods has hitherto generally been adopted viz.:-a belt or strap when
the distance between the two pulleys is sufficient, and a Vaucanson or other form of
chain when the distance has been small.
Now the object of our invention is to provide a belt or strap suitable for all
purposes when motion has to be transmitted from one wheel or pulley to another.
Our belt or strap is composed of a band of steel or other suitable material formed
with holes at regular distances apart the distance depending upon the circumference
of the wheels or pulleys over which the belt or strap has to pass. In each bole is
rivetted or fixed a stud or tooth the form of which can be varied,-for example it may
be hemispherical or conical. In the periphery of the wheels or pulleys are recesses
or holes of the same distance apart as the studs and of the same form. Thus when
the belt or strap is passed over the two wheels the studs take into the corresponding
recesses therein so that if the one wheel be driven the belt will transmit
the motion to the other, with a speed depending upon the respective diameters of the
two wheels.
In some cases we place a small plate or disc above each stud hole in the belt and
another plate or disc below the hole the neck or shank of the stud passing through the
plates. These plates prevent or reduce the bending of the strap at the points where
the studs are, as it passes round the wheels; the strain or wear on the strap
at and near the studs is thereby reduced while the strap can pass round pulleys
of small diameter because it can be bent or curved to a large extent between the
studs.

page_text: For use in connection with straps thus made pulleys are formed with flat or
approximately flat parts to receive the portions of the straps at and near the studs
alternating with curved or more rounded parts to receive the intermediate portions of
the straps.
When the two ends of a strap meet they are fixed together by a double nut which
allows of their being disconnected in case of need.
The belt may if desired be composed of a number of short lengths connected
together by the rivetted studs.
Our straps are particularly adapted for use in velocipedes in lieu of the ordinary
chains.
Dated this 10th day of January 1988

page_text: Improvements in the Means or Apparatus for Transmitting Motion.
We, CHARLES AUGUSTE THURON, Engineer and VICTORIEN LOUIS MARIE RENARD,
Mechanician, both of 1. Boulevard St. Denis, Paris, France, 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 :-
For the purpose of transmitting motion from one pulley or wheel to another one
or other of two methods has hitherto generally been adopted, viz. a belt or strap when
the distance between the two pullies has been sufficient, and a Vaucanson or other
form of chain when the distance has been small. Figure 1 of the annexed drawings
illustrates this, A and B being two shafts, carrying respectively two pullies P and Pi
and L being a chain for transmitting motion from one pulley to the other.
Now the object of our invention is to provide a belt or strap suitable for all purposes
where motion has to be transmitted from one wheel or pulley to another.
A belt or strap somewhat similar to ours has previously been tried; it was com-
posed of a band of steel, see L Figure 2, formed with holes a a at regular distances
apart the distance depending upon the circumference of the wheels or pulleys over
which the belt or strap was to pass. In each hole was rivetted or fixed a stud or tooth
the form of which varied, see b, c and d Figure 3. In the periphery of the wheels or
pulleys were recesses or holes at the same distance apart as the studs and of the same
form as shown at b, c and d in Figure 4. Thus, when the belt or strap was passed
over the two wheels the studs took into the corresponding recesses therein so that if
the one wheel were driven the belt transmitted the motion to the other with a speed
depending upon the respective diameters of the two wheels. But belts or straps thus
made did not last long because the strain or wear produced at and near the studs by
the bending of the strap over the wheels soon caused a crack or flow which gradually
extended until the strap broke.
In order to overcome this defect we construct the strap or belt in such manner
that there is no undue strain or wear at and near the studs and we employ the strap
in connection with wheels or pulleys which are not circular as hitherto but of special
form as hereinafter described. While retaining in other respects the forms of straps
and studs or teeth such as are indicated in Figures 2 and 3, but employing
preferably the form of stud or tooth shown in Figure 4, we place a small plate or
disc b (Figures 5 and 6) above each stud hole in the strap and another plate or
disc c below the hole the neck or shank of the stud passing through the plates.
These plates prevent or reduce the bending of the strap at the points where the studs
are, as it passes round the wheels; the strain or wear on the strap at and near the studs
is thereby reduced while the strap can pass round pulleys of small diameter because
it can be bent or curved to a large extent between the studs.
For use in connection with straps thus made we construct wheels or pulleys as
shown in Figure 6 with flat or approximately flat parts f to receive the portions of
the straps at and near the studs alternating with curved or more rounded parts to
receive the intermediate portions of the straps.

page_text: Where the two ends of a strap meet they are fixed together by a double nut j
Figure 6 which allows of their being disconnected in case of need.
at
The strap may if desired be composed of a number of short lengths as shown
g, h, i Figure 7 connected together by studs and nuts a so that the strap can be
taken to pieces if required.
Our straps are particularly adapted for use in velocipedes in lieu of the ordinary
chains.
When they are of steel they are inextensible and consequently preserve the same
tension for an indefinite time; their wear is null and seeing that there is no absorp-
tion of power by friction, motion is transmitted from one wheel to another without loss
of force. They can be nickel or silver plated or galvanized if desired or coated with
a protective varnish.
The formation of the stud holes in our straps can be avoided if the studs be fixed
thereto by pressure by means of screws; with this object the straps are formed of two
parallel steel wires between which the shanks of the studs are passed, nuts and lock
nuts being afterwards screwed up tight on the shanks so as to fix the studs firmly to
the steel wires by jamming the latter between the stud heads and the nuts. But
however modified our straps cannot turn without soon breaking upon circular wheels
or pulleys of small diameter but they can be used safely with wheels of the special
form hereinbefore described, that is to say so as to present flat or approximately flat
parts to the portions of the straps at and near the studs.
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 in respect of means or apparatus for transmitting motion is :-
1. The improved construction of studded or toothed straps or belts hereinbefore
described.
2. The special construction of wheels or pulleys with flat or approximately flat
parts as hereinbefore described for use in connection with studded straps or belts as
set forth.
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