An Improvement in or applicable to Pneumatic Tyres.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
An Improvement in or applicable to Pneumatic Tyres.
I, WILLIAM FREDERICK WILLIAMS of 32, Shaftesbury Avenue, London, W.
Gentleman, do hereby declare the nature of this invention to be as follows:-
My invention relates to an improved non-slipping tyre or band for pneumatic
tyres of bicycles and it has for its object to render the non-slipping qualities more
durable notwithstanding wear.
With a view to prevent slip it has been usual to provide the tyre or band with
honeycomb or other like cavities or with corrugations or projections, but such
cavities or projections have been so formed that when the band becomes slightly
worn it no longer presents sharp edges to the ground and the grip originally
obtained becomes materially diminished whereas by my invention sharp arrises are
preserved notwithstanding wear of the tyre or band which is practically as effective
when worn quite thin as when new.
I form in the band or tyre by punching, moulding, or otherwise, cavities or holes
of round, square, or other form arranged chequer-wise or in any other order,
said cavities or holes having parallel sides normal to the surface of the ground or
otherwise so that however much the tyre or band may be worn away the arrises
around these cavities will always be sharp and thus the desired grip of the ground
will always be obtained.
If the cavities be made in the cover or jacket of the tyre itself they would be
formed by moulding and would be so spaced and of such a depth as that there will
be sufficient material for wear at the tread and for the protection of the contained
air chamber. If the cavities be made in a band to be applied to an existing tyre
they may be similarly formed or they may if preferred be "through" apertures
punched or otherwise formed in the band.
Dated this 14th day of March 1896.
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.
An Improvement in or applicable to Pneumatic Tyres.
I, WILLIAM FREDERICK WILLIAMS of 32, Shaftesbury Avenue, London, W.
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 :-
My invention relates to an improved non-slipping tyre or band for pneumatic
tyres of bicycles and it has for its object to provide a tread whereby side slip
may be more effectually prevented and whereby the non-slipping qualities are
rendered more durable notwithstanding wear of the tread.
With a view to prevent side slip it has been usual to provide the tyre or band.
with honeycomb or other like cavities, or with corrugations or projections, but

page_text: such cavities or projections have been so formned that when the band becomes
slightly worn it no longer presents sharp edges to the ground and the grip originally
obtained becomes materially diminished whereas by my invention sharp arrises are
preserved notwithstanding wear of the tyre or band which is practically as effective
when worn quite thin as when new.
The invention will be described with reference to the accompanying drawing
which illustrates in cross section and outside face view the invention as applied to
a non-slipping band to be applied to the smooth jacket of a tyre.
The band is formed by moulding or otherwise of longitudinal ribs a a' a connected
by cross pieces in one with the ribs and at sufficiently short intervals apart to
prevent the ribs splaying apart whilst leaving the arrises of the ribs free to obtain
an unobstructed grip of the ground, the cross pieces being for this purpose of less
thickness than the ribs and therefore countersunk below the wearing surface of the
ribs on the outside but flush with the ribs on the inner side of the band which
comes next the jacket of the tyre. The ribs are thus separated by grooves which
are divided by the cross pieces into separate cavities, the essential feature of the
invention being that the opposed faces of the ribs which form the sides of the
grooves are parallel to each other throughout the depth of the groove when
the band is in the transversely curved form corresponding to the configuration of
the tyre to which it is applied so that however much the ribs may wear the arrises
which they present at c will always be right-angled and sharp and will thus always
obtain the grip of the ground necessary to avoid side slipping instead of, as when
the corrugations are separated by grooves of curved section, the arrises becoming
by wear of the ribs gradually more and more obtuse-angled and therefore less and
less effective for the purpose. The opposed faces of the cross pieces 6 are also
parallel but these do not come into action until the ribs are worn down.
I have shewn the connecting strips b as at right angles to the ribs but it will
be evident that they may be diagonal or otherwise, the cavities being of round,
square, diamond, oblique, or other form.
In the case of a band, as shewn, the cavities are made quite through it, but in
applying the invention to the jacket or cover itself the cavities would extend only
so far through its thickness as to leave sufficient material at the bottoms of the
cavities for the protection of the contained air chamber.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
A non-slipping tread for pneumatic tyres whether formed on the jacket of the
tyre itself or on a band to be applied thereto and constituted by circumferential
connected ribs separated by grooves or cavities and presenting parallel opposed
lateral surfaces throughout the depth of the grooves or cavities substantially as
and for the purpose specified.
Dated this 14th day of Donaimber 1906
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.