nents in Means for Transmitting Motion between Wheels.
Year: 1896

page_text: Date of Application, 3rd Mar., 1896
Complete Specification Left. 4th Jan.. 1897-Accepted, 3rd Mar., 1897
PROVISIONAL. SPECIFICATION.
Improve nents in Means for Transmitting Motion between Wheels.
GERALD PERCIVAL 30 Old Georges Street Cork Electrical Engineer do
hereby declare the nature of this invention to be as follows:-
An improved method of communicating motion from one wheel to another wheel
or wheels by means of bands of non-stretching material such as steel hard drawn
metals or where these would be unsutable such as celluloid, hard rubber, leather or
the like and so forming the bands & the wheels on which they run that the drive is
positive & without slip and the working strains and wear & tear are as much as
possible confined to those portions most sutable to withstand them.
This do by providing the bands with holes or eyelets or bars or projections,
and the wheels on which such bands run and drive, or by which they are driven,
with projections to enter the holes or eyelets or notches or recesses to receive the
projections, such wheels being so made that the bending of the bands running on
them only takes place at the flexible parts, the portions driven by the wheel, being
usually thickened or hardened to withstand the pressure put on them, the
thickening being either formed out of the substance of the band itself, or being an
addition in the form of eyelets in the holes in the baud, or of clasps or additions
fixed to the barid, the bands themselves being either constructed of one strip of
material, or of several strips, or of a strand or number of strands the joinings of
the bands being made if required at the portions which in running on the special
wheels, are not strained by bending, or only slightly so.
Dated this 28th day of February 1896.
GERALD PERCIVAL,
30 Georges Street, Cork, Electrical Engineer.
Improvements in Means for Transmitting Motion between Wheels.
GERALD PERCIVAL 30 Old Georges Street Cork Electrical Engineer 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:-
I construct bands having holes or eyelets, by taking a strip of suitable non-
stretching material, usually steel or hard drawn or rolled bronze, but celluloid etc.
may be sometimes used, & perforating it at regular intervals, with holes of
sufficient size to receive the projections on the wheels on which it is to run leaving
a reasonable amount of freedom or relief to enable the teeth or projections on the
wheels to enter & leave the boles without unnecessary friction, in cases where it is
desirable that the band should not have any superfluous material, & is required to
mpact & light

page_text: I use a strip or hand of material of such thickness as to give a sufficient depth to
the holes, to provide a sufficiently wide area of surface to come in contact with the
teeth of the wheels, to resist the wear & tear to which these will be subject,
(Fig. 1 & 2 B) & the strip of material must be of ample width, to leave sufficient
material at sides of holes, to stand the tensile strains to which the band will be
subject, then mill, grind or otherwise suitably remove, a considerable portion of
the material (Fig. 1 & 2 A) from the thickness of the strip or band in the spaces
between the holes, to render these parts flexible. The maximum degree to which
these parts will be bent in use, must be less than that which will give them an
appreciable perinnent set, this being determind by the degree of elasticity of the
material, and in the case of steel bands. 1 prefer to give these parts a spring
temper, the wheels must be of such size, that the curved portions on which (Fig. 1.
& 4. H.) the band rests, or is bent round shall be of such curveture, that the
bending of the band shall not exceed the determind amount. In cases where the
size of the wheel is small in proportion to the band, and the consequent bending
considerable, the width of the strip or band will be determind by the widths of
material necessary to give the requisite tensile strength, after the material has
been reduced to the thickness required to give the requisite flexibility.
The spaces between the holes should be considerable, I prefer them not to he
less than 3 times the diameter of the holes, thus leaving a considerable length of
flexible portion, (Figs. 1. to 5. A) this part being reduced to a uniform thickness
or nearly so, the thick portion gradually rounded or merged into it, so as not to
leave angles or sharp lines of demarkation between them.
The wheels form of such shape, that the projections or teeth are situated at
regular intervals round the circumference, (Fig. 1. D) & on flat facets formed on
the surface, or in the centre of recesses sunk below the surface, the remaining parts
of the circumference (Figs. 1. & 4. II.) of the wheel being so corved that the
flexible parts of the band will lie & bear on them & the rigid parts of band not
touch or only just touch the parts on which the projections or teeth are situated,
by which construction the thick parts of the band are not subjected to much
bending strain, & the thin & flexible parts are only subjected to a limited
amount of bending & to the tensile strain due to working on the wheels.
A suitable form for the working surface of the wheel may be obtained by taking a
portion of the band to be used containing as many holes & one more as there are
to be teeth or projections on the wheel & joining the end holes together, to form a
hoop template, removing half the thickness of the material from the underside of
one end, & half from the top side of the other end, & clamping them in position
with a well fitting bolt & nut, the mean inside shape of the sections included by
adjacent holes, will be the form required for each section or portion of the wheel
surface from one projection to the next, the mean of several sections of the trial
band, should be taken to avoid errors due to inequality of temper or thickness of
material, when the band is to be used as an endless one, I make the required joint
in one of the thick portions, halving them together as described for making the
hoop template, (Figs. 1 & 3. G. F.) in this case the holes in the ends should be
enlarged aufficiently to admit of using an eyelet or short tube to join them with
(Fig. 3. F.) instead of the bolt used for the hoop tenplate, the interior diameter of
such eyelet or tube (Fig. 1. F.) must be similar to that of the ordinary holes in the
band, & its thickness such that the shearing strains to which it is subjected, may
be amply provided for, such eyelet or tube may be secured, either by expanding
the ends, or by providing it with a projecting shoulder at one end, & a flat nat or
screw collar threaded on (Fig. 3. G.) to the other end, this latter being the most
suitable construction for bands, which may be required to be removed from
their wheels from time to time, or additional holes may be made in the substance
of the material adjacent to the holes halved together & suitable rivets or screws
inserted in them.
In another form of the perforated band, I simply take a strip of material, such as
a clock or watch spring & punch or drill holes in it at regular intervals, afterwards

page_text: bushing or lining these holes with short tubes or eyelets of metal expanded
& riveted into the holes & if necessary rymered or bored inside to ensure accuracy.
The joints being made by lapping the two ends over one another, & passing one
eyelet or bush through the two ends and securing it either by a nut on one end &
shoulder at the other, or by expanding or riveting it on to its place.
When it is advisable to use more than one strip or strand of flexible material,
I arrange two or more such strips or strands parallel to each other (Fig. 5. A. A.),
& provide cross bars (Fig. 5. B. B.) from one to the other, the whole construction
being of ladder-like form, the sides being the flexible portions & the crossbars the
ridgid or unbending portions. The parallel portions & the crossbars or projections
may be formed out of one picce of material, by removing the surplus portions, or by
connecting two or more strips or strands by cross pieces, separately attached by
riveting or soldering (Fig. 5.) etc. to each strip or strand. The wheels to receive
such bands being formed to receive the bands on their circumference, and with
projections which project between the several strips or strands & drive by contact
with crossbars or rungs, or if it is desirable to have a smooth outer surface (Fig. 4.)
to the band when in use, these crossbars may be on one surface (Fig. 4. B.) only, &
fit into recesses in the surfaces or circumference of the wheels. In either case the
shape of portions of the wheel circumference on which the flexible parts of such
bands rest, should be curved so as to avoid bending any part of the band to such a
degree as to produce a permanent set in the material, the shape being obtained in
a similar manner to that described for the whesls for the first mentioned bands.
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 is
1st. The use of bands constructed substantially as described.
2nd. The use in such bands of ridgid portions to engage with the driving teeth,
or projections or notches of the wheels.
3rd. The use of flexible portions between the ridgid parts of such bands to take
the bending strains.
4th. The use. in conjunction with such bands of wheels formed so as to confine
the various sorts of strains to the parts of the bands suitable to bear them.
5th. The jointing of the bands at the ridgid portions.
6th. The constructing & use of the various parts & the combination of them
substantially as & for the purposes set forth.
Dated this 2nd day of January 1897.
GERALD PERCIVAL,
30 Old Georges Street, Cork, Electrical Engineer.