Improvements in Tyres or Rims for Cycles and other Vehicles.
Year: 1890

page_text: Date of Application, 21st Oct., 1890
Complete Specification Left, 20th July, 1891-Accepted, 19th Sept., 1891
PROVISIONAL SPECIFICATION.
Improvements in Tyres or Rims for Cycles and other Vehicles.
I, WILLIAM ERSKINE BARTLETT, of 21 Buckingham Terrace, Edinburgh,
Managing Director of The North British Rubber Company Limited, do hereby
declare the nature of this invention to be as follows :-
This invention relates to tyres which consist of a flat endless band of india-rubber
wider than the dovetailed groove into which it is inserted so that it assumes an
arched form when in place. I introduce between the arched outside tyre and the
circular bottom of the metal rim a tube constructed of cloth and india-rubber
provided with a branch for filling it with compressed air. By this arrangement the
outer band tyre may be reduced in thickness, and while assisting in sustaining the
pressure (from weight) on the outer band the lateral pressure of the inside air-tube
will press its edges tightly against the dovetailed flanges of the metal rim and thus
assists in holding it more firmly against the flanges of the metal rim at the
momentarily bearing part of the tyre. It will be obvious that one advantage of
this arrangement is that successive outside bands or tyres can be renewed from
time to time without the necessity of wasting the tubular air chamber between it.
and the metal rim, and thus greater economy will be attainable. It will be
generally most convenient to have the filling tube of the tubular air chamber
projecting from the surface of the tubular air chamber resting on the metal rim, in
which a hole is bored through which to pass the filling tube..
Dated this 21st day of October 1890.
WM. E. BARTLETT.
COMPLETE SPECIFICATION.
Improvements in Tyres or Rims for Cycles and other Vehicles.
I, WILLIAM ERSKINE BARTLETT, of 21 Buckingham Terrace, Edinburgh,
Managing Director of The North British Rubber Company Limited, 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 relates to tyres which consist of a flat endless band of india rubber
wider than the dovetailed groove into which it is inserted so that it assumes an
arched form when in place. I introduce between the arched outside tyre and the
circular bottom of the metal rim a tube constructed of cloth and india rubber
provided with a branch for filling it with compressed air. By this arrangement
the outer band tyre may be reduced in thickness, and while assisting in sustaining
the pressure (from weight) on the outer band the lateral pressure of the inside air
tube will press its edges tightly against the dovetailed flanges of the metal rim and
thus be effective in holding it more firmly against the flanges of the metal rim at
the momentarily bearing part of the tyre. It will be obvious that one advantage
of this arrangement is that successive outside bands or tyres can be renewed from
time to time without the necessity of wasting the tubular air chamber between it
and the metal rim, and thus greater economy will be attainable. It will be generally

page_text: most convenient to have the filling tube of the tubular air chamber projecting from
the surface of the tubular air chamber resting on the metal rim, in which a hole is
bored through which to pass the filling tube.
Where thin outer tyres are used 1 slightly thicken their edges where they lie
inside the trough.
DESCRIPTION OF THE DRAWINGS.
Figures 1 and 2 are transverse sections of wheels made according to my
invention.
a is the outer tyre of india rubber or other elastic material. 6 is a metal tyre or
rim. c is an air tight tubular chamber and d is the filling tube.
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 :-
1. The combination of a grooved rim or metal tyre, and an arched tyre of india
rubber or other flexible material held in the groove by the pressure of an inflated
tube within the arch which forces its edges against the sides of the groove
substantially as described.
2. Tyres or rims for cycles and other vehicles consisting of the parts a b c
combined and arranged, substantially as described and shewn in the drawings.
Dated this 13th day of July 1801
a is the outer tyre of india rubber or other elastic material. 6 is a metal tyre or
rim. c is an air tight tubular chamber and d is the filling tube.
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 :-
1. The combination of a grooved rim or metal tyre, and an arched tyre of india
rubber or other flexible material held in the groove by the pressure of an inflated
tube within the arch which forces its edges against the sides of the groove
substantially as described.
2. Tyres or rims for cycles and other vehicles consisting of the parts a b c
combined and arranged, substantially as described and shewn in the drawings.
Dated this 13th day of July 1801
CARPMAEL & Co.,
Agents for the Applicant.