Improved Means for Fastening Pneumatic Tyres to their Rims.
Year: 1892

page_text: Date of Application, 8th Sept., 1892
Complete Specification Left, 5th June, 1893-Accepted, 8th July, 1893
PROVISIONAL SPECIFICATION.
Improved Means for Fastening Pneumatic Tyres to their Rims.
A communication by the firm of FRANKENBURGER & OTTENSTEIN, of Nuremberg,
in the Empire of Germany, Cycle Manufacturers.
I, WILLIAM PHILLIPS THOMPSON F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors, 6, Lord Street, Liverpool & 6, Bank Street, Man-
chester, both in the County of Lancaster and 323, High Holborn in the County of
Middlesex, Civil Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to that kind of cycle wheels the tyres of which are filled
with compressed air, and in which the attachment of the tyre to the rim of the
wheel constitutes one of the most important points. This object is attained in this
invention by means of two simple attachment rings of elastic material.
According to this invention the rim of the wheel to be tyred is of such a section
that it encloses a groove on the under side, whilst it is bordered at its outer circum-
ference by two flanges. Between these parts, that is the groove and the two flanges,
two rolls curving outwards at the sides are arranged on the circumference of the rim,
which (rolls) enclose, on the inside, semi-circular channels.
The fastening of the tyre on the rim is made in the following manner :-
The tyre is placed in an empty, that is to say uninflated, condition, round the
rim in such a way that a thickened projection which is formed all round the tyre
on its inside fits into the aforesaid groove of the rim. Two elastic rings, preferably
of india-rubber are then successively inserted in one of the respective channels
enclosed by the rolls aforesaid, in such a way that the tyre is thus pushed to the
side in opposite directions.
As the rings undergo expansion to pass over the outer circumference of the wheel
rim, they have a tendency, when placed in their respective channels, to once more
assume their normal length and thickness, that is to say, they exercise a pressure
on what they surround in consequence of their inherent elasticity, so that on the
one hand the inwardly projecting part of the tyre and on the other the main body
of the tyre are forced between the rolls aforesaid. In cousequence of this therefore
an appreciable connection of the tyre with the rim is produced by means of these
rings alone. This attachment is however made a completely firm and immovable
one, when the empty tyre or the air cushion surrounding the same is inflated with
compressed air. There then comes into play, in addition to the above named
elastic tension, the pressure exerted toward the outside by the tyre, by which
means the latter is wedged still more firmly between the elastic rings and pressed
against the flanges. Any unintentional loosening or slackening of the fastening
thus formed is rendered entirely impossible if the rolis provided with inwardly
curving projections also surround the upper half of the elastic rings, and thus
prevent them from springing out.
The tyre may be very quickly taken off by letting out the compressed air and
taking off with the hand the fastening rings.
Dated this 7th day of September 1892.
WM. P. THOMPSON & Co.,
Agents for the Applicant..

page_text: Improved Means for Fastening Pneumatic Tyres to their Rims.
A communication by the firm of FRANKENBURGER & OTTENSTEIN, of Nuremberg,
in the Empire of Germany, Cycle Manufacturers.
I, WILLIAM PHILLIPS THOMPSON F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Man-
chester, both in the County of Lancaster, and 323, High Holborn, in the County of
Middlesex, Civil Engineer, 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 that kind of cycle wheels the tyres of which are filled
with compressed air, and in which the attachment of the tyre to the rim of the
wheel forms one of the most important points. This object is attained in this
invention by means of two simple attachment rings of clastic material.
As shown in Figures 1 and 2 of the accompanying drawing, the rim of the wheel.
to be tyred is of such a section that it forms a groove a on the under side, whilst it
is bordered at its outer circumference by two flanges b. Between these parts,
that is the groove and the two flanges, two rolls c c curving outwards at the sides
are arranged on the circumference of the rim, and which rolls enclose on the inside
semi-circular channels.
The fastening of the tyre on the rim is made in the following manner-
The tyre e
placed in an empty, that is to say uninflated condition, round the
rim in such a way that a thickened projection el which is formed all round the tyre
on its inside fits into the aforesaid groove a of the rim. Two elastic rings d d¹
preferably of india-rubber are then successively inserted in one of the respective
channels enclosed by the rolls cc' aforesaid, in such a way that the tyre e is thus
pushed to the side in opposite directions (see Figure 1).
As the rings d d become expanded in passing over the outer circumference of
the wheel rim, they have a tendency, when placed in their respective channels, to
once more assume their normal length and thickness, that is to say, they exercise
a pressure on what they surround in consequence of their inherent elasticity, so
that on the one hand the inwardly projecting part e¹ of the tyre e and on the
other the main body of the tyre are forced between the rolls c c' aforesaid. In
consequence of this therefore a durable connection of the tyre with the rim is
effected by means of these rings alone. This attachment is however made a
completely firm and immovable one, when the empty tyre or the air tube is
inflated with compressed air. There then comes into play, in addition to the
above named elastic teusion, the pressure exerted toward the outside by the tyre,
by which means the latter is wedged still more firmly between the elastic rings d d
and is pressed against the flanges & 61. Any unintentional loosening or slackening
of the fastening thus formed is rendered entirely impossible if the rolls cc¹ provided
with inwardly curving projections falso surround the upper half of the elastic
rings d d' and thus prevent them from springing out as best seen in the cross section,
Figure 1.
The tyre may be very quickly taken off by letting out the compressed air and
taking off with the hand the fastening rings.
Figure 3 shows the side view of a wheel constructed according to this invention.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as cominunicated to me by
my foreign correspondents, I declare that what I claim is-
A pneumatic wheel tyre fastening with elastic fastening rings d d' inserted in
suitable grooves c c in the rim and a projection e' thickening towards the wheel

page_text: rim, holding the air tube between them, so that the latter is retained firmly in
position by the inner air pressure, and the elasticity of the rings of the air tube, all
Bubstantially as described.
Dated this 3rd day of June 1802
WM. P. THOMPSON & Co.,
Agents for the Applicant.