Improvements in Pneumatic Tyres.
Year: 1897

page_text: Date of Application, 23rd Dec., 1897--Accepted, 5th Mar., 1898
COMPLETE SPECIFICATION.
Improvements in Pneumatic Tyres.
I, PETER THOMPSON MCKAY, of 100, Cowan Avenue, in the City of Toronto, in
the County of York, in the Province of Ontario, Canada, Manufacturer, 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:-
My invention relates to improvements in pneumatic tyres for bicycle and other
wheels and the object of the invention is to design a positive and secure fastening
for the edges of the tyre upon the rim and it consists essentially in providing
within the edge loop of the canvas two complete chains of arc-shaped wire links,
which are designed to grip the rim and hold the tyre in place when inflated in the
manner hereinafter more particularly explained.
Fig. 1, is a perspective view of portion of a tyre and rim of a bicycle showing the
applicability of my invention.
Fig. 2, is a cross section showing my tyre fastening as applied to a crescent-
shaped rim.
Fig. 3, is a cross section showing my invention as applied to the form commonly
known as the Dunlop rim.
In the drawings like letters of reference indicate corresponding parts in each
figure.
A is the tyre, which is composed of the outer portion A¹ and inner canvas
portion A2, which is provided with edge loops a formed by turning the canvas back
upon itself. The canvas of course is cemented in the usual manner to the outer
cover A¹. B is the rim.
C is the chain comprising a series of arc-shaped links C¹ preferably of wire, the
arc of which corresponds substantially to the arc of the circle of the rim.
The links are connected to each other at right angles one to the other but when
pressed against the rim by the pressure of the air in the air tube D the main por-
tion of each link lies flat down upon the rim.
The connecting portions of the two links, however, form a projection, which by
the force of the pressure of the air tube serves to imbed itself into the rim so
securely, I find in practice, that the tyre is held securely in place without it being
necessary to use any cement whatsoever in any form of rim to which I may apply
my binding device for the edges of the tyre.
I am aware that several devices have been used in the form of circumferential
wires within the loops formed at the edge of the tyre to hold the edges of the tyre
and consequently the tyre to the rim but I do not wish to claim any such device.
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:
In a bicycle or other wheel, in combination the rim, the tyre provided with edge
loops, the air tube located within same and the wire chains extending through each

page_text: edge loop circumferentially around the rim and comprising arc-shaped links con-
nected at right angles whereby the links are projected at the joints against the
rim and the main body of each arc-shaped link is held flat by the pressure of the
air tube as and for the purpose specified.
Dated the 23rd day of December 1897.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.