Year: 1895

page_text: I ate of Application, 23rd Oct., 1895
Complete Specification Left, 21st Nov., 1895-Accepted, 21st Dec., 1895
1, THOMAS CRAWFORD DENNISON, of Oamaru,in the Colony of New Zealand,
Civil Engineer, do hereby declare the nature of this invention to be as follows:-
'My present invention relates to belts bands used 'for driving machinery and
more especially to bands used as substitutes for the "pitch chams" now ordinarily
used in combination with suntable corresponding chain-wheels, for driving bicycles
and other velocipedes
It has been proposed to use, in place of chain-wheels of the kind described, a
tbin endless stip of steel or other suitable metal, of the necessary width,tand of
such length that it will fit, with the proper degree of tightness, round the wheels
01 pullies upon which it is placed This metal strip is coated all over the
usual way with one onmote coatings of vulcanized indiarubber or other like softland
elastic material, which becomes firmly and permanently attached to the metal strip.
The india ubber is made of such shape,. in cross section as to fit intcorresponding
grooves round the peripheries of the pullies round which the endless band
passes, and such an arrangement.forms.an excellent substitute for the ordinary
chain wheels and pitch chains, used intoyoles, and for other purposes of the like
kind
In bands constructed in the manner described, however, the endless metal strip
is not sufficiently flexible.and. is 'likely, to break, alter a certain amount ofanse,
thereby rendering the whole band useless; and my presont invention thas for
its object a novel method of making the endless metallic band,, so that it is
extremely flexible, wery strong, easily made, not liable to stretch, nor likely to
wem.out
For this purpose I take a sufficient length of fine, strong, metallic wire,
preferably steel such as is well known as "piano" wire, and d wind this wire in
parallel and adjoming coils round acdium tortwheel of the proper diameter, soshat
the coils fon a flat endless ribbon of the required width and length, and I
attach the two ends of the wue to the coil by soldering or other equivalent
means.
The parallel coils of the wire band are kept in then proper position by means
of a suitable solder, of sufficient flexibility applied to. their whole surface, or at
Intervals.
The Hexible metallic band made as described is finally coated with plain o
vulcanized india ubber, of suitable thickness and section, as already described,
and some cases wind round the coil hard canvas or the like equivalent material
before forming their external coating of indinrubber
Where nlazed udiarubber isused for the exterioncoating, Infirsticoat the wne
coil with arthin coating of aluminium, so thatsthe wne coil may not be injuriously
affected by any sulphi present in the indiarubber.. 01, instead of aluminium
other substance unaffected by sulphur may be used
Bands made according to my invention me exti omely light and flexible, and at
the same time of great strength and incapable of stretching in the duration of
their length, and then durability is very gent.. They may be applied to all
purposes for which flexible bands or belts are ordinarily used.

page_text: I do not confine myself to the precise details of, construction, and materials,
which may be varied more or less to suit different cucumstances
Dated this 231d day of October 1895.
EDWARDS & Co,
65 and 66, Chancery Lane, London, Agents for the Applicant.
1
provements in Driving Bands.
1, THOMAS CRAWFORD DENNISON, of Oamaru, in the Colony of New Zealand,
Civil Engineer, do hereby declare the nature of this invention, and in what mannel
the same is to be performed, to be particularly descubed and ascertamed mand
by the following statement, and accomuanying diawing, that is to say :-
"
My present invention relates to belts or bands used for driving machinery, and
more especially to bands used as substitutes for the "pitch chains now ordinatily
used in combination with stable corresponding cham-wheels, for driving bicycles
and other velocipedes.
It has been proposed to use, in place of chains of the kind described, a thin
endless stip of steel or other stable metal, of the necessary width, and of such
length that it will fit, with the proper degice of tightness, round the wheels o1
pullies upon which it is placed
This metal stup is coated all over in the usual way with one or more coatings of
vulcanized india rubber, or other like soft and elastic material, which becomes
firmly and permanently attached to the metal strip
The india rubber is made of such shape, in ci oss section as to it in corresponding
grooves 1ound the peripheries of the pullies round which the endless band passes,
and such an aangement forms an excellent substitute for the ordinary cham
wheels and pitch chains, used in cycles, and for other purposes of the like kind
In order to increase the grip, the sides of the grooves may be made waved oi
undulating.
In bands constructed in the manuer described, however the endless metal strip is
not sufficiently flexible and is likely to break after a certain amount of use, thereby
rendering the whole band useless, and my present invention has for its object a novel
method of making the endless metallic band, so that it is extremely flexible, very
strong, easily made, not liable to stretch, nor likely to wear out,
The accompanying drawing is in illustration of my invention.
Fig. 1 shows the composition of the band
1
Figure 2, 18 a cross section, and Figure 3 is a similar cross section, shewn on a
large scale for clearness.
Figure 4 is a side view of the band
I take a sufficient length of fine, strong, metallic wie, preferably steel such as is
well known as piano" wne, and I wind this wire in parallel and adjoining coils
10und a dium or wheel of the proper diameter, so that the coils form a flat endless
ribbon of the required width aud length, and I attach the two ends of the wine to
the coil by soldering or other equivalent means, (as illustrated in Figure 1, where
represents one end of the coil bent across and soldered to the rest of the band a).
The parallel coils of the wue band are kept in then proper position by means of
a suitable solde, of sufficient flexibility, appled to then whole surface, or
intervals.
at
1
The flexible metallic band made as described, after having been removed from
the drum or wheel round which it has been wound, is finally coated with plain or
vulcanized rudiarubber, (as illustrated at d in the figures,) of suitable thickness and
section, as already described, and in some cases I wind 1ound the coil hard canvas

page_text: or the like equivalent material (as illustrated at c) before forming the external
coating of indiarubber
Where vulcanized indiai ubber is used for the exterior coating, I first coat the
wne coil with a thin coating of aluminium, so that the wire coil may not be
injuriously affected by any sulphur or other injurious ingredients present in the
indianbber, or, the solder used may be of aluminium or a compound of
aluminium.
Or, instead of aluminium other substances unaffected by sulphur may be used.
Bands made according to my invention are extremely light and flexible, and at
the same time of great strength and incapable of stretching in the direction of their
length, and their durability is very great. They may be of any desired section, and
applied to all purposes for which flexible belts or bands are ordinarily used.
I do not confine myself to the precise details of form, construction and materials,
which may be varied more or less to suit different circumstances.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim 18.
1. In driving bands, the combination of an internal band formed of a coil of
metal wire, and an external coating of indiarubber of the required section, formed
and combined substantially as described.
2. In the driving band described and claimed in Claim 1, the intermediate
coating of the internal band of metal wue, with a flexible material, applied before
the band is coated with india rubber, substantially as described and illustrated.
3. In the driving bands described and claimed in Claims 1 and 2, the coating of
the internal wire band with a material not affected by the sulphur or other
ingredients contained in the india rubber, substantially as described
Dated this 21st day of November 1895
EDWARDS & Co.,
65 and 66, Chancery Lane, London, Agents for the Applicant.