Improvements in Band Driving Gear.
Year: 1895

page_text: Date of Application, 23rd Sept., 1895
Complete Specification Left, 23rd June, 1896-Accepted, 29th Aug.,
1896
PROVISIONAL SPECIFICATION.
Improvements in Band Driving Gear.
We, HERBERT GUTHRIE, of Albert Road, Levenshulme, Manchester, in the
County of Lancaster, Engineer, and Harry WalrOND GUTHRIE, of 76 Prince's
Road, Liverpool, in the said county, Gentleman, do hereby declare the nature of
his invention to be as follows:
-
Our improvements relate to driving gear in which endless bands without pin or
other working joints are employed and our improved band is preferably made of a
continuous ribbon of spring steel.
On the edges of this ribbon we form notches at regular intervals and round the
ribbon in the notches we wind wire of any suitable section, preferably rectangular
or nearly so in order to form teeth. The wire may be wound spirally either in
a regular spiral or at right angles with the band on one side and obliquely on the
other; or the wire may be used in short lengths and bent round the band either
straight or obliquely in single or multiple coils each length of wire forming
one tooth.
The advantages of the approximately rectangular form of lapping wire are
threefold. In the first place, the rectangular tooth has relatively greater effective
engaging depth than a round one; in the second place, its wearing surface is
greater; and, in the third place, since the breadth of the inner bent surface
widens in bending it will tighten in the notches of the bands and become practically
immovable.
In the case of the multiple coil arrangement it may be found expedient to have
the inner bending surface slightly narrower in order not to cause a parting of the
coils by reason of the aforesaid expansion during the process of hending or lapping
round the band. It may also be found desirable to form the inner bending
surface slightly concave in order to counteract the tendency to convexity in
bending.
The wheels for engaging with these bands may be solid castings or stampings;
or when lightness is an object we stamp or punch them out of sheet material.
If formed with a flange on each side of the band we may make them of two
discs first flanged at a right angle to the disc to form the drum and then
partly back parallel with the disc to form the side flange. The discs may be
cut away to lighten the wheel and form arms; these discs would be rivetted
or otherwise fastened together, preferably close together at the rim and apart
at the centre in order to give lateral stiffness. Or, instead of flanging the
dises we may form the rim out of a suitably rolled section or out of a plain
strip of metal rolled or spun into the desired form with flanges on the top
and a mid-feather underneath, any suitable arrangement of spokes being fastened
thereto. In either the case of the wheel formed of discs or that of the rolled strip
rim we may dispense with the double flange and instead put one in mid-width by
securing between the discs or in the mid-leather of the strip rim a washer shaped
ring with parts removed at intervals leaving projections. In this case the ribbon
band would have narrow slots made in it between the teeth and corresponding with
the projections with which they engage. In all the cases the flanges and drums of
the wheels would have suitable recesses made in them to engage with the teeth
5 of the band. The centres or bosses of the wheels are sometimes formed, by

page_text: flanging only and sometimes with strengthening rings, or
the two.
Dated this 21st day of September 1895.
a combination of
H. B. BARLOW & GILLETT,
Agents for Applicants.
Improvements in Band Driving Gear.
We, HERBERT GUTHRIE, of Albert Road, Levenshulme, Manchester, in the
County of Lancaster, Engineer, and HARRY WALROND GUTHRIE, of 76 Prince's
Road, Liverpool, in the said county, Gentleman, 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 improvements relate to driving gear in which endless bands without pin or
other working joints are employed and our improved band is preferably made of a
continuous ribbon of spring steel.
On the edges of this ribbon we form notches at regular intervals and round the
ribbon in the notches we wind wire of any suitable section, preferably rectangular
or nearly so in order to form teeth. The wire may be wound spirally either in a
regular spiral or at right angles with the band on one side and obliquely on the
other; or the wire may be used in short lengths and bent round the band either
straight or obliquely in single or multiple coils each length of wire forming
one tooth.
The advantages of the approximately rectangular form of lapping wire are
threefold. In the first place, the rectangular tooth has relatively greater effective
engaging depth than a round one, in the second place its wearing surface is
greater, and, in the third place, since the breadth of the inner bent surface widens
in bending it will tighten in the notches of the bands and become practically
immovable.
In the case of the multiple coil arrangement it may be found expedient to have
the inner bending surface slightly narrower in order not to cause a parting of the
coils by reason of the aforesaid expansion during the process of bending or lapping
round the band. It may also be found desirable to form the inner bending
surface slightly concave in order to counteract the tendency to convexity in
bending.
The wheels for engaging with these bands may be solid castings or stampings;
or when lightness is an object, we stamp or punch them out of sheet material.
If formed with a flange on each side of the band we may make them of two
discs first flanged at a right angle to the disc to form the drum and then
partly back parallel with the disc to form the side flange. The discs may be
cut away to lighten the wheel and form arms; these discs would be rivetted
or otherwise fastened together, preferably close together at the rim and apart
at the centre in order to give lateral stiffness. Or, instead of flanging the
discs we may form the rim out of a suitably rolled section or out of a plain
strip of metal rolled or spun into the desired form with flanges on the top
and a mid-feather underneath, any suitable arrangement of spokes being fastened
thereto. In either the case of the wheel formed with discs or that of the rolled
strip rim we may dispense with the double flange and instead put one in mid-width
by securing between the discs or in the mid-feather of the strip rim a washer
shaped ring with parts removed at intervals leaving projections. In this case the
ribbon band would have narrow slots made in it between the teeth and corresponding
with the projections with which they engage. In all the cases the flanges and
drums of the wheels would have suitable recesses made in them to engage with the

page_text: eeth of the band.
The centres or
by flanging only and sometimes with strengthening rings, or a combination of
he two.
Aud in order that our invention may be fully understood and readily carried
nto effect we will describe the accompanying two sheets of drawings reference
being had to the figures and letters marked thereon.
Fig. 1 is a plan view of a partly finished driving band made according to our
invention; one tooth is shown applied to this band and another tooth is shown in
section.
Fig. 2 is a sectional end view of Fig. 1, and
Fig. 3 is a plan view of part of Fig. 1 on an enlarged scale.
Figs. 4, 5 and 6 are three plan views of modified forms of driving bands.
Figs. 7 and 8 are views of one method of joining the ends of the band
together.
Figs. 9 to 14 represent various improved methods of constructing wheels of sheet
metal for engaging with the improved bands.
Figs. 15 to 17 represent different constructions of bands to avoid using side
flanges or shrouds on the wheels.
In the drawings,-a represents a band of steel or other suitable metal notched at
regular intervals a¹ to receive the driving teeth b which are of rectangular or other
suitably shaped wire; the wire is cut off into the required lengths to form a single
tooth and is then bent tightly over the band in the notches so as to clip tightly
over and secure it firmly to the band, see Figs. 2 and 3, the latter view showing
on an enlarged scale the shape a square piece of wire assumes at the bend the
flattened portion of the wire fitting closely into the rounded notches or recesses a¹
made to receive it. If desirable the teeth could also be brazed or soldered to
the band.
The metal band may be cut away between the teeth as shown in Figs. 1 and 3,
or it may be a plain straight band notched only at regular intervals a' as shown
in Figs. 4 and 5, where a continuous wire b is employed to form a number of
teeth.
In Fig. 4 a round wire is represented and in Fig. 5 a rectangular wire which
would preferably be bent as shown in order that the grip on the baud a would
be tight.
Fig. 6 represents the band with a tooth b made of extra length so as to pass
almost twice round the band a, the wire is bent as represented. It is obvious that
any number of laps of wire may be employed for each tooth.
Figs. 7 and 8 are views representing a convenient form of joint; the two ends
of the band a are overlapped and two adjoining teeth are bent over the lapped ends
of the band.
Figs. 9 and 10 represent one construction of our improved driving wheels
particularly adapted for driving bands made according to our invention.
In constructing this wheel we take two discs of metal i and j of suitable size and
thickness to forin the wheel; the periphery of each disc is shaped as shown with
notches cut away and the discs are then bent to form the flanges on their
periphery and the inner edges are bent so that the turned in edge of j lies inside
the turned out edge i and these adjoining portions of the discs may be secured
together by soldering or brazing and the discs are preferably rivetted together
below the rim. When the wheel is to be screwed on to a shaft a thread can be
cut in the part i.
In Figs. 11 and 12 a separate flanged rim k which is formed in any convenient
manner out of sheet or strip metal is combined with the discs i andj; the discs
extend into recesses in the rim and are secured by pins k¹. The inner flauges of
the discs are secured together by soldering, brazing or rivetting.
An alternative form of securing the rim k and discs i andj together is shown
in Figs. 13 and 14 where tongues and j' pass through slots in the rim k and are
bent outward.

page_text: In the wheels described with reference to Figs. 9 to 14 when the driving band is
laid upon the wheels the teeth lie.in the recesses and the band is prevented from
moving off sideways by the flanges on the wheel rim.
Fig. 15 represents an end section of a driving band a with a specially shaped
tooth a cut out as at a³ to fit over the rim of the wheel as shown below and form a
guide to prevent the band moving sideways on the wheel; projections on the rim of
the wheel ergage with portions of the teeth in order to drive the band.
Fig. 16 represents a band a in section, with a wire tooth at formed of square or
other suitable section; a space is left between the ends of the tooth which comes
over a narrow portion of the wheel rim shown below and prevents the band moving
sideways.
Fig. 17 is another modification for dispensing with the side flanges on the wheel.
In this case the wire tooth a passes nearly twice round the band the ends of the
wire being bent at about a right angle to the band are arranged to fit over
the rim of the wheel and form a guide for the band to prevent it moving
sideways.
Our improved driving bands can be made all of steel or if required to be
particularly flexible a more ductile metal could be employed and the driving
teeth may be of any section capable of being lapped tightly over a band and
forming a driving tooth; further the teeth may be set at any desired angle to
the band.
The discs which form the sides of the wheels may have portions cut away
between the boss and the rim in order to make them lighter.
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
1. An improved driving band composed of a ribbon of sheet metal notched at
regular intervals and furnished with wire teeth secured in said notches substantially
as and for the purposes described.
2. In a driving band of the type described, the use and application of teeth
formed and secured to the band by lapping at regular intervals pieces of wire once,
or two or more times round the band substantially as and for the purposes
described.
3. A driving band with teeth of such shape that flanges on the driving wheels
may be dispensed with substantially as shown and as described with reference to
Figs. 15, 16 & 17.
•
4. A band wheel composed of two discs of metal formed with recesses to receive
the teeth of the driving band substantially as and for the purposes described with
reference to Figs. 9 and 10.
5. A band wheel composed of two metal discs or their equivalents in com-.
bination with a rim formed out of sheet or strip metal with recesses to receive
the teeth of the driving band substantially as and for the purposes described with
reference to Figs. 11 to 14.
Dated this 22nd day of June 1896
H. B. BARLOW & GILLETT,
17 St. Ann's Square, Manchester, Agents for Applicants.