An Improvement relating to Pneumatic Tyres.
Year: 1898

page_text: Date of Application, 8th Nov., 1898
Complete Specification Left, 29th Aug., 1899-Accepted, 30th Sept., 1899
PROVISIONAL SPECIFICATION.
An Improvement relating to Pneumatic Tyres.
FREDERICK WILLIAM SCHROEDER, Engineer, of 19, Adam Street, Adelphi,
London, WILLIAM JAMES HENRY CARR-BOYD, Mining Expert, Savage Club,
Adelphi Terrace, London, do hereby declare the nature of this invention to be as
follows:-
Our improvement is as follows
The cover of the pneumatic tyre is somewhat similar to the ordinary cover with
the exception that ours has two V shaped ridges running round the tyre on the
outside so that the skin friction and non slipping of the tyre is prevented by this
method as it causes a suction on the ground. We also claim a separate band to
be made in a semicircl which then forms the two V shape projections from the
edge of the tyres. This gives an additional cushion for either which can be
adjusted on any present tyre in use it also gives safety against puncturing.
8th November 1898
An Improvement relating to Pneumatic Tyres.
We, FREDERICK WILLIAM SCHROEDER, Engineer, 19, Adam Street, Adelphi,
London, and WILLIAM JAMES HENRY CARR-BOYD, Mining Expert, Savage Club,
Adelphi Terrace, London, 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; —
:
This invention has mainly for its object to effectually prevent side slip in
bicycles by increasing the lateral hold of the wheels on the ground, and it consists
in providing the outer periphery of the tyre with two projecting circular ribs of
outward curved tapering or triangular cross section at some distance apart, which
ribs rest upon the ground and which, on the wheel being pressed down by a load,
spread outward to a certain extent, thus affording increased lateral adhesion of
the tyre to the ground, and by the broad surface of contact thus provided effectu-
ally preventing side slip. The invention also affords the further important
advantages that the said circular ribs effectually protect the pneumatic tyre against
being punctured, and they also enable the bicycle to stand upright without
requiring any additional support.
The said angular ribs may either be formed on a separate caoutchouc band,
FD 071

page_text: which is cemented to the pneumatic tyre, or it may be formed on the pneumatic
tyre or tyre cover itself.
Fig. 1 of the accompanying drawings shews a cross section of the first named
construction, in which a band a adapted to be cemented on to a pneumatic tyre
or tyre cover is provided with two deep ribs bb of tapering or angular section at
some distance apart and formed with an outward curvature. The inner sides of
the ribs being rounded or sloped outward as shewn, so that when the wheel is
loaded, they will tend to spread in the outward direction; it will be seen that
when thus spread the ribs will afford a considerable width of surface for adhesive
contact with the ground, which, on the wheel being inclined to one side will be
correspondingly increased on the same side by an increased spread of the flange,
as shewn at Fig. 2, and thus will effectually prevent side slip.
The caoutchouc ribs are so proportioned as to strength that when the wheel is
loaded they will not be flattened out entirely but will always preserve a certain
hollow space between them under the tyre, keeping this from contact with the
ground and effectually preventing it from being punctured and also obviating the
objectionable back suction which is produced by the flattening of ordinary tyres
on the ground. It will also be found that the ribs are a sufficient distance apart to
enable the bicycle to stand alone when unloaded without requiring additional
support.
Fig. 3 shews the construction in which the ribs bare formed directly upon
the pneumatic tyre cover e of any known kind.
When the ribs are formed on a separate band as at Fig. 1, they are preferably
made of somewhat harder caoutchouc than the tyre on which they are fixed.
Although the invention is applicable with more particular advantage to bicycle
tyres, yet it may also be applied with advantage to all pneumatic tyres on account
of the effectual protection against puncture which it affords.
We are aware that it has already been proposed to form circular ribs on pneu-
matic tyres, and we do not therefore claim this construction generally; in such
proposed arrangements the ribs have not been so formed that when subject to
pressure they will spread laterally in an outward direction, so as to increase the
surface of contact, which is the essential feature of our invention.
Having thus particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:
-
The combination with a pneumatic tyre or tyre cover of two deep caoutchouc
ribs of an outwardly curved form such as bb, which, when subjected to the pres-
sure of a load on the wheel, will spread laterally and afford increased adhesive
contact surface on the road which will effectually prevent side slip, substantially
as described.
T
11
A