Improvements in the Elastic Tyres or Rims of the Wheels of Velocipedes and other Vehicles.
Year: 1890

page_text: Date of Application, 14th Oct., 1890
Complete Specification Left, 13th July, 1891-Accepted, 15th Aug., 1891
PROVISIONAL SPECIFICATION.
Improvements in the Elastic Tyres or Rims of the Wheels of
Velocipedes and other Vehicles.
I, WILLIAM ERSKINE BARTLETT, of No. 21 Buckingham Terrace, Edinburgh,
Manager of The North British Rubber Company Limited, do hereby declare the
nature of this invention to be as follows:-
These improvements have for their object the simplification of the construction,
and of the application of such tyres to the wheels on which they are to be placed,
and consist in forming the tyres of flat endless bands of india-rubber, preferably
lined on the inside with a layer or layers of canvas or other textile material or
with a layer of semi-hard rubber, or, if it be desired to make the tyre reversible
or less liable to puncture, with these layers or any of them placed in the middle of
the rubber band This band is pressed between the dovetailed flanges of the rim
or metal tyre of the wheel. The width between said flanges being less than the
width of the band or tyre. to get the tyre into position it requires to be bent or
arched. This the flexibility of the rubber permits, and when in position the
elasticity of the india-rubber presses the edges of the tyres tightly against the
dovetailed flanges, by which means alone the tyre is firmly held to the iron tyre
or rim, and in virtue of the rubber band being wider than the distance between
the flanges it assumes, when placed between them, a rounded outside surface, and
thus forms an arched tyre entirely out of contact with the middle of the metal
rim and therefore free to cushion the wheel more effectively than a solid rubber
tyre resting on a metal rim or tyre.
li may be observed that a cylinder of india-rubber lined with cloth or semi-hard
rubber on the inside or middle may be formed on a mandril the size of the wheel
and a whole series of tyres of any desired width cut therefrom as in the preparation
of ordinary india-rubber bands.
Instead of constructing the band, which is to form the tyre, flat or of rectangular
section, which when in position on the wheel forins a uniformly curved outside
bearing surface to the tyre, I sometimes form an outside surface with ridges and
grooves so that when bent into position there will be modified but corresponding
ridges and grooves on the outside or bearing surface of the tyre.
Dated this 14th day of October 1890.
CARPMAEL & Co.,
Agents.
COMPLETE SPECIFICATION.
Improvements in the Elastic Tyres or Rims of the Wheels of
Velocipedes and other Vehicles.
1, WILLIAM ERSKINE BARTLETT, of No. 21 Buckingham Terrace, Edinburgh,
Manager 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 :-
These improvements have for their object the simplification of the construction,
and of the application of such tyres to the wheels on which they are to be placed,
and consist in forming the tyres of flat endless bands of india rubber, preferably
lined on the inside with a layer or layers of canvas or other textile material or with
a layer of semi-hard rubber, or if it be desired to make the tyre reversible or less
liable to puncture, with these layers or any of them placed in the middle of the

page_text: rubber band. This band is pressed between the dovetailed flanges of the rim or
metal tyre of the wheel. The width between said flanges being less than the width
of the band or tyre, to get the tyre into position it requires to be bent or arched.
This the flexibility of the rubber permits, and when in position the elasticity of
the india rubber presses the edges of the tyres tightly against the dovetailed flanges,
by which means alone the tyre is firmly held to the iron tyro or rim, and in virtuo
of the rubber band being wider than the distance between the flanges it assumes,
when placed between them, a rounded outside surface, and thus forms an arched
tyre entirely out of contact with the middle of the metal rim and therefore free to
cushion the wheel more effectively than a solid rubber tyre resting on a metal rim
or tyre.
It may be observed that a cylinder of india-rubber lined with cloth or semi-hard
rubber on the inside or middle may be formed on a mandril the size of the wheel
and a whole series of tyres of any desired width cut therefrom as in the preparation
of ordinary india-rubber bands.
Instead of constructing the band, which is to form the tyre, flat or of rectangular
section, which when in position on the wheel forms a uniformly curved outside
bearing surface to the tyre, 1 sometimes form an outside surface with ridges and
grooves so that when bent into position there will be modified but corresponding
ridges and grooves on the outside or bearing surface of the tyre.
In place of vulcanizing the india rubber tyre in a cylindrical form it may be
moulded in the arched forin and be so vulcanized.
DESCRIPTION OF THE DRAWINGS.
Figures 1 and 2 are transverse sections of wheels made according to my inven-
tion. a is an arched tyre of india rubber or other flexible material and is a
metal tyre or rim. is one of the spokes of the wheel. Figures 3, 4, 5 and 6
are longitudinal sections of alternative forms of cylinders from which the india
rubber tyre may be formed a being rubber and a¹ canvas or other textile material
or semi-hard rubber.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what I
claim is :-
1. The combination of a rinn or metal tyre of a trough section the sides of the
trough inclining towards each other and a hollow arched tyre of approximately
the same thickness throughout abutting against the bottom and inclined sides of
the trough substantially as described.
2. The combination of a rim or metal tyre of a trough section the sides of the
trough inclining towards each other and a tyre consisting of a cylinder of india
rubber or other flexible material of greater length than the width of the trough so
that when in place it assumes an arched form the two ends of the cylinder abutting
against the bottom of the trough whilst the ends of the curved surface of the
cylinder abut against the inclined sides of the trough substantia y as described.
3. Elastic tyres or rims substantially as described and shewn in the drawings.
Dated this 13th day of July 1891.
CARPMAEL & Co.,
Agents for the Applicant.
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