Improvements in Tyres of Wheels of Bicycles, Tricycles, Applicable also to Ambulance, Invalid. and Common Road Carriages.
Year: 1889

page_text: Date of Application, 24th July, 1889
Complete Specification Left, 22nd Apr., 1890-Accepted, 24th May, 1890
PROVISIONAL SPECIFICATION.
Improvements in Tyres of Wheels of Bicycles, Tricycles, Applicable
also to Ambulance, Invalid. and Common Road Carriages.
I, WILLIAM ERSKINE BARTLETT of 21 Buckingham Terrace Edinburgh Rubber
Manufacturer do hereby declare the nature of this Invention to be as follows:-
:-
These improvements relate to the rubber tyres used in these vehicles and to the
metal tyres over which they are placed, and consist in constructing them so that the
rubber tyres shall be held to the metal ones without the use of cement and such like
adhesives, and with little or no stretch or tension thereby eradicating or minimising
the injurious effects incidental to rubber tyres put on under tension, an unavoidable
condition when cement is used.
In every road sharp stones and other materials are more or less prevalent, and
it is impossible to prevent scratches or cuts in the rubber tyres therefiom, and in
respect that a scratch or cut in rubber under tension is very liable to develop into
a deep cut or complete fracture the importance of my improvement becomes manifest.
Not only will durability of the rubber tyres be increased and the trouble of cementing
the stretched rubber tyres to the metal ones be saved, but greater facility of
mounting the rubber tyies on the wheels will be obtained.
In carrying out these improvements I form a rubber tyre with about three-fourths
of its cross section circular or thereby. and the remaining part, or part in com-
bination with the metal tyre, is expanded into a dovetail shape which is pressed
into a dovetail groove in the metal tyre and so held to the wheel.
To secure cushioning to the wheel with as little rubber as possible I groove the
rubber forming the dovetail of the tyre to form an air space or chamber in the
middle thereof, between it and the metal tyre, which may be flat under the dovetail
portion of the rubber tyre or it may be also grooved so as to increase the air
space or chamber. Another function of the groove in the rubber is to get greater
lateral pressure from the rubber against the flanges forming the groove in the
metal tyres at the part which is on the ground carrying the load, thus providing
against the shifting of the rubber at the time when and place where any disturbance
of the rubber takes place. The hollow space or air chamber may be got by grooving
one or other or both the rubber and metal tyres. The dovetailed extension of the
rubber tyres and the corresponding dovetailed grooves in the metal tyres over
which they are placed, nie obtained by processes well known to rubber and metal
manufacturers respectively. I prefer to form the dovetailed portion of the rubber
tyre of a stiffer quality of rubber than the other part.
Dated this 24th day of July 1889
CARPMAEL & Co.,
Agents.
COMPLETE SPECIFICATION.
Improvements in Tyres of Wheels of Bicycles, Tricycles, Applicable
also to Ambulance, Invalid, and Common Road Carriages.
1. WILLIAM ERSKINE BARTLETT of 21 Buckingham Terrace Edinburgh Kubber
Manufacturer 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 :-
These improvements relate to the rubber tyres used in these vehicles and to the
metal tyres over which they are placed and consist in constructing them so that the
rubber tyres shall be held to the metal ones without the use of cement and such like

page_text: adhesives, and with little or no stretch or tension thereby eradicating or minimising
the injurious effects incidental to rubber tyres put on under tension, an unavoidable
condition when cement is used.
In every road sharp stones and other materials are more or less prevalent, and it is
impossible to prevent scratches or cuts in the rubber tyres therefrom, and in respect
that a scratch or cut in rubber under tension is very liable to develop into a deep cut
or complete fracture the importance of my improvement becomes manifest. Not only
will durability of the rubber tyres be increased and the trouble of cementing the
stretched rubber tyres to the metal ones be saved, but greater facility of mounting
the rubber tyres on the wheels will be obtained.
In carrying out these improvements I form a rubber tyre with about three fourths
of its cross section circular or thereby, and the remaining part, or part in combination
with the metal tyre is expanded into a dovetail shape which is pressed into a dovetail
groove in the metal tyre and so held to the wheel.
To secure cushioning to the wheel with as little rubber as possible I groove the
rubber forming the dovetail of the tyre to form an air space or chamber in the middle
thereof, between it and the metal tyre, which may be flat under the dovetail portion
of the rubber tyre or it may be also grooved so as to increase the air space or
chamber. Another function of the groove in the rubber is to get greater lateral
pressure from the rubber against the flanges forming the groove in the metal tyres at
the part which is on the ground carrying the load, thus providing against the shifting
of the rubber at the time when and place where any disturbance of the rubber takes
place. The hollow space or air chamber may be got by grooving one or other or
both the rubber and metal tyres. The dovetailed extension of the rubber tyres and
the corresponding dovetailed grooves in the metal tyres over which they are placed
are obtained by processes well known to rubber and metal manufacturers respectively.
I prefer to form the dovetailed portion of the rubber tyre of a stiffer quality of rubber
then the other went