Improvements relating to Pneumatic Tyres for Wheels.
Year: 1892

page_text: COMPLETE SPECIFICATION.
Improvements relating to Pneumatic Tyres for Wheels.
I ALFRED KERRY of 8 Shoreditch in the County of London, India Rubber
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 :-
The object of this invention is to provide a simple way of securing the outer
covering or sheath of pneumatic tyres, more especially for use on velocipedes.
In carrying out my invention, I may employ any form of rim, the invention being
capable of application thereto with facility.
In the accompanying drawing, I have shown my invention as applied to various
sections of rim.
Fig. 1 shows a solid rim, A, in the form of a flat ring with beaded edges turned
outwards. The sheath B is formed with beaded or enlarged edges, as now well
understood. C is a retaining rim, in the form of a flat ring with beaded edges
turned inwards, that is to say, the reverse of the rim A. D is the air bag, provided
with a suitable valve, which is passed through coinciding holes in the two
rims A, C.
The rim C is of slightly larger diameter than the rim A, so that when both are
brought into position, there will be sufficient space between them, to allow for the
thickness of the sheath.
To insert the sheath, the rim C is pushed a little to one side, to allow for the
beads on the sheath being inserted between the beads of the two rims, and the rim C
is then pushed back into the position shown in the figures.
The air bag is then blown out in the usual way, and the pressure thereby
produced on the sheath, causes its beads to jam in between the beads on the rims,
and hold them firmly in position, without the necessity for bolts and nuts or other
fastening.
Fig. 2 shows a curved section of solid rim A, and Fig. 3 an open V-shaped
section.
In both these cases, the rim C is flat.
Figs. 4 and 5 show the solid rims A and the retaining rim C of curved section,
with different shaped beads, and with a sheath having different shaped beads or
enlargements.
Figs. 6 and 7 show two forms of hollow rims A', with my invention adapted
thereto. In Fig. 6, as the hollow rim A' is not recessed, I rivet the flat solid rim A
thereto. In the form Fig. 7, this is unnecessary, as the hollow rim is recessed to a
sufficient extent to receive the beads of the sheath.
Fig. 8 shows a sheath with double beaded edges.
Fig. 9 shows a modification in the form of the beads on the rims.
In this case, I provide an extended surface at the part a, which will ensure the
effect of properly holding the sheath, notwithstanding the exact non-coincidence of
the retaining rim C.
Fig. 10 shows a modification in the position of the retaining rim C. In this case,
a solid U-shaped rim A is shown, and the retaining rim C is arranged to enter
within the rim A.
In all these arrangements, which are given by way of example only, it will be
seen that the retaining rim is loose, and it is held in position solely by the tension
of the air bag causing the sheath beads or enlargements to jam between or pull
against the beads or shoulders on the rims.
It will be obvious that this invention is equally adaptable to carriage wheels,

page_text: especially in the form shown at Fig. 1, in which the rim A would take the place of
the ordinary metal tyre.
Having now particularly described and ascertained. the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
The mode herein shown and described, of securing the external covering.or
sheath of pneumatic tyres, and consisting in inserting the beaded or enlarged edges
of the sheath between the rim and a loose retaining ring, and causing the. bead's or
enlargements to jam between or pull against beads or shoulders of or on both the
rim and.ring, by inflating the air bag or tube enclosed within the sheath, as set
forth.
Dated this 22nd day of December 1892.