Improvements in the Covers of Pneumatic Tyres..
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Covers of Pneumatic Tyres..
1.
I, WILLIAM ARThur Griffiths, of 299, Bradford Street, Birmingham, Tyre
Maker, do hereby declare the nature of this invention to be as follows:-
The object of this invention is to provide a cover for the inflatible tubes of
pneumatic tyres, which can be fitted to any dished rim securely, and which can
be easily detached therefrom. To effect this object, I attach to one side of my
cover, a sheath of canvas, in which is inserted a length, or ring, of spring steel.
wire, crimped or turned backwards and forwards from right to left, and vice-
versa, of less circumference than the rim it is intended to fit. One side of my
cover is also fitted with studs, or hooks, and the other side. with
corresponding loops, or holes, or I may insert a length of thin
sheet steel inside the canvas, at each edge of my cover,, and turn the length
in one side, inwards, towards the inside of the cover, and the opposite one, out-
wards, towards the outside of the cover, or I may use lengths of the above
described wire in the same manner.
The inflatible tube is placed inside the cover, the edges of which are then drawn
together around the sheath of canvas containing the crimped spring, wire, by
means of the studs, or hooks, or by interlocking the lengths of thin spring steel,
where they are used in preference to the studs, or hooks. The sheath of canvas,
containing the crimped spring wire, lies underneath the tube, and on top of the
interlocked edges of the cover. The tyre is then sprung on to the rim, and the
crimped spring wire, in the sheath of canvas, automatically grips the rim, securely
attaching the tyre thereto.
When the tyre is blown up, the air pressure assists the wire in firmly gripping.
the rim.
Another method which I may employ, is to insert a length of the above described
crimped wire, in each edge of my cover, and spring each side on, to the rim
separately. When the tube is blown up, the air pressure expands the inner edge
of each length of wire, and consequently contracts the outer edge, securely fasten-
ing each side of the cover to the rim..
Doted this 13th dox of October 1898

page_text: 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 cover for the inflatible tubes of
pneumatic tyres, which can be fitted to any dished rim securely and which can
be easily detached threfrom or attached thereto while at the same time they are
capable of being cheaply manufactured.
1
In order that my invention may be clearly understood and more easily carried
into practice I have appended hereunto two sheets of drawings upon which I have
fully illustrated my improvements together with the mode of carrying the same
into effect, and several modifications thereof.
Figure 1 is an enlarged section through one of my tyres with the cover
attached complete.
Figure 2 is a part similar section to Figure 1 but shewing the cover detached
Figure 3 is a similar view of the cover to Figure 2 but shewing a modification.
Figure 4 is a similar section to Figure 3 but shewing the tyre attached to the
rim.
Figure 5 is a similar section to Figure 4 but illustrating the position of the
cover when each side is sprung on to the rim separately.
Figure 6 is a longitudinal sectional elevation of Figure 5.
To effect my object I attach to one or both sides of my cover A¹ a sheath of
canvas a², in which is inserted a length, or ring, of spring steel wire A which
is bent backwards and forwards from right to left, and vice versa
to form a zig-zag band and of less circumference than the rim B
which it is intended to fit. One side of the cover A¹ is also fitted with
studs, or hooks, a³ and the other side with corresponding loops or holes a' as
shewn by Figure 3 and 4 or I may insert a length of thin sheet steel a5 inside the
canvas, at each edge of my cover and turn the length on one side inwards towards
the inside of the cover and the opposite one, outwards, towards the outside of the
cover as shewn by a6 and a Figure 2 or I may use lengths of the above described
wire in the same manner. The inflatible tube D is placed inside the cover A¹
the edges of which are then drawn together either as shown in Figures 3 and 4,
or around the sheath of canvas a³ containing the crimped or zig-zag spring
wire A as shewn by Figure 2 and secured by means of the studs a³ or hooks as
shewn by Figures 3 and 4 or by interlocking the lengths of thin spring steel as
where they are used in preferance to the studs or hooks as shewn by Figure 2.
The sheath of canvas a² containing the crimped spring wire A when ready for
attachment to the rim lies underneath the tube D and on top of the interlocked
edges of the cover a³. The tyre is then sprung on to the rim and the crimped
wire A in the sheath of canvas a automatically grips the rim securely attaching
the tyre thereto so that when the tyre is blown up the air pressure assists the
wire in firmly gripping the rim. In cases where I insert a length of the above
discribed crimped wire A in each edge of my cover I may spring each side on to
the rim B separately so that when the tube D is blown up the air pressure
expands the inner edge 8 of each length of wire and consequently contracts
the outer edge a securely fastening each side of the cover to the rim by retaining
the contracted edge a³ at the bottom or smallest circumferential part of the rim
as shewn by Figures 5 and 6 or the two flaps or sheaths a³ may be first secured
together by means of a series of hooks clasps, studs or eyelet holes previously
provided in the flaps as shewn by Figure 3 and before inflation sprung on to the
rim into the position shewn by Figure 4.
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
!
1st. In pneumatic tyres the zig zag wire rings or lengths A sheathed. in the
internal flap or flaps a² of the cover A¹ in combination with the means for fasten-

page_text: ing the same and a dished rim substantially as and for the purpose herein set
forth and illustrated by Figures 1 to 4.
2ond. In pneumatic tyres the double rings of zig-zag wire sheathed in the cover
in combination with an inner air tube and an outer dished rim substantially as
and for the purpose herein set forth and illustrated by Figures 5 and 6.
Dated this 28th day of September 1899
LEWIS WM. GOOLD,
Agent for Applicant, 5, Corporation Street, Birmingham.