Improvements in Pneumatic Tyres and Rims for Cycle and other Wheels.
Year: 1893

page_text: Date of Application, 10th Feb., 1893
Complete Specification Left. 9th Nov. 1893-Accepted, 9th Dec., 1893
PROVISIONAL SPECIFICATION.
Improvements in Pneumatic Tyres and Rims for Cycle and other
Wheels.
1, EDOUARD MICHELIN, of Clermont-Ferrand, in the Republic of France,
Manufacturer, do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved construction for the rim and tyre of a
pneumatic wheel especially applicable to cycles but which may be used for other
purposes. The rim with the tyre in position is shown in the annexed drawing.
The rim is made of thin sheet steel bent to a trough like shape and of dimensions
such as to give the necessary stiffness; it has a contracted mouth formed by
bending over the sides of the rim. The outer jacket which is preferably of
vulcanised rubber has selvages of greater substance than the parts adjacent. The
size of the contracted mouth of the rim is such that when one edge or selvage of
the jacket is in place in the mouth there is room for the other edge or selvage of
the jacket to pass in but not room for both selvages to pass in or out at the same
time.
The drawing shows a transverse section of the rim, the jacket and the air tube.
COMPLETE SPECIFICATION.
Improvements in Pneumatic Tyres and Rims for Cycle and other
Wheels.
I, EDOUARD MICHELIN, of Clermont-Ferrand, in the Republic of France,
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:-
This invention relates to an improved construction for the rim and tyre of a
pneumatic wheel especially applicable to cycles but which may be used for other
purposes. The rim with the tyre in position is shewn in the annexed drawing.
The rim is made of thin sheet steel bent to a trough like shape and of dimensions
such as to give the necessary stiffness; it has a contracted mouth formed by
bending over the sides of the rim. The outer jacket which is preferably of
vulcanised rubber has selvages of greater substance than the parts adjacent. The
size of the contracted mouth of the rim is such that when one edge or selvage of
the jacket is in place in the mouth there is room for the other edge or selvage of
the jacket to pass in but not room for both selvages to pass in or out at the same
time.
The drawing which accompanies my Provisional Specification shows a transverse
section of the rim, the jacket and the air tube.
A is the rim.
B is the jacket with its selvages B¹ B.
C is the air tube, preferably of thin india rubber.
The rim as will be seen has its trough like sides bent inwards to form lips, these
contract the mouth of the trough as already stated and also provide sufficient
supporting surface for the tyre.

page_text: The selvages of the jacket are of a form well suited to engage with the lips
when they are entered between them and they are maintained in engagement by
the outer edges of the selvages abutting the one on the other. It is thus practically
impossible for the selvages of the jacket to escape from the lips of the rim so long
as the air tube is inflated but before the inflation of the air tube it is easy to enter
the selvages of the jacket one at a time between the lips of the rim.
The air tube is preferably made of thin india rubber as is now usual.
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 :-
The combination in a cycle or other wheel of a rim, a jacket and an air tube, all
substantially as described and shown; the rim of trough like form with inwardly
projecting lips contracting the mouth of the trough and providing supporting
surfaces for the pneumatic tyre; the jacket with edges or selvages so proportioned
that they can enter and leave the rim one only at a time, and when in place abut
together at their outer edges and the air tube of air proof elastic material such
as india rubber.
Dated this 28th day of October 1893