Improvements in Tyres for the Wheels of Bicycles, Motor Cars, Carriages, and such like.
Year: 1897

page_text: Date of Application, 7th Dec., 1897
Complete Specification Left, 28th July, 1898-Accepted, 19th Nov., 1898
Improvements in Tyres for the Wheels of Bicycles, Motor Cars,
Carriages, and such like.
CHARLES MCHARDY, 20, Chapel Street, Edinburgh, Carriage Builder, do hereby
declare the nature of this invention to be as follows:-
The new hollow tyre shall be punched, slotted, or cut, at intervals or con-
tinuously all around its entire inner circumference, so as to admit of free escape
or ingress of air, moving between the said hollow tyre and a slip of rubber, that
shall be cemented or otherwise fixed on its under outer edges, to said hollow
tyre, completely covering said perforations, slots, or cuts, but not cemented or
fixed on its centre, or middle part, which is left free so as to admit of expansion
or contraction, as necessary when pressure is applied. The hollow tyre can be
constructed either with or without inner tube or tubes, either intact or punched,
or slotted, or cut, as desired. The hollow tyre shall have its greatest thickness
on its outer sides or circumference, or parts which shall come in contact with the
ground, when in use, and shall be of such thickness of rubber as shall be con-
sidered necessary for the weight of vehicle to which it is applied fixed or fitted.
Dated this Sixth day of December 1897.
CHARLES MCHARDY.
Improvements in Tyres for the Wheels of Bicycles, Motor Cars,
Carriages, and such like.
CHARLES MCHARDY, 20, Chapel Street, Edinburgh, Carriage Builder, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following state-
ment:-
The new hollow tyre shall be punched slotted or cut at intervals or con-
tinuously all around its entire inner circumference, so as to admit of free escape
or ingress of air moving between the said hollow tyre and a slip of rubber, that
shall be cemented, or otherwise fixed, on its under outer edges to said hollow
tyre completely covering said perforations slots or cuts but not cemented or
fixed on its centre, or middle part which is left free so as to admit of expansion
or contraction, as necessary when pressure is applied. The hollow tyre can be
constructed either with or without inner tube or tubes, either intact or punched
or slotted or cut as desired. The hollow tyre shall have its greatest thickness
on its outer sides or circumference or parts which shall come in contact with the
Price 8d

page_text: ground when in use, and shall be of such thickness of rubber as shall be con-
sidered necessary for the weight of vehicle to which it is applied fixed or fitted.
In the drawings which are filed herewith two sections of the tyre are shown.
a. Holes or slots cut round the inner circumference of the tyre to admit of free
passage of air between the hollow chamber of the tyre and a slip of rubber.
b. Slip of rubber detached from tyre.
c. The air chamber or hollow of the tyre.
Having now fully described and ascertained the nature of my said
invention and the manner in which the same is to be performed I declare that what
I claim is:-
1. An improved uncollapsable pneumatic tyre for bicycles carriages and such
like that is inflated by the normal pressure of air in the air chamber or hollow
of the tyre.
2. The utility of the tyre cannot be affected by being punctured.
3. There is no inflating or distending of the tyre by compressed air, the rubber
is left at its normal density, which secures greater smoothness when running thus
minimising vibration.
Date A