Improvements in or connected with Pneumatic Tyres.
Year: 1899

page_text: Date of Application, 11th Feb., 1899
Complete Specification Left, 27th Oct., 1899-Accepted, 2nd Dec., 1899
PROVIDIUNAL SPECIFICATION.
Improvements in or connected with Pneumatic Tyres.
We, Dr. ALBERT GERLACH, of 11, Nienburgerstrasse, Chemist, and AUGUST
ERNST, of 4, Dessauerstrasse, Head Foreman, both of Hanover, in the German
Empire, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in or connected with pneumatic tyres.
The fitting of pneumatic tyres, provided with an outer cover as manufactured
hitherto, upon the rim of a wheel is a difficult and inconvenient practice and is
also accompanied by the disadvantage that the air tube very frequently becomes
nipped between the edges of the cover and also that the air tube is twisted in
one or more places so that very frequently rupture or damage takes place.
Now, it is the object of this invention to obviate these disadvantages and to
this end we apply inside the outer cover a special protective cover which is
cemented or otherwise secured to the tread portion of the outer cover, that is to
say, it forms one piece with the outer cover at this part and, when closed, is of
such a size that the air tube fits thereinto. The invention can advantageously
be applied both to tyres the covers of which have swellings or ribs upon their
edges and to tyres without such swellings. In the latter case, in contradistinction
to that of Dunlop tyres, in addition to the advantages above named there is also
the advantage that the tyre can be fitted not only to rims of the Dunlop-West-
wood type but also to other rims such as deep or flat wood rims and the like.
In carrying out the invention as applied to a tyre having an outer cover with
edge swellings or ribs, the protective cover or. layer is secured by cement to the
tread portion of the outer cover so that two opposite and flap-like strips are formed
which can be connected together by buttons or by other suitable means. Before
fitting on the tyre the air tube is laid in the protective cover and the edges of
the strips are secured together. In this operation no difficulty is experienced in
laying the tube straight and even in position as the air tube is visible at every
point before closing up the protective cover and no tensions can be set up-as is
the case when fitting on a tyre of ordinary construction. After the air tube is
inserted and the protective cover is closed, around its whole periphery the fitting
of the tyre to the rim does not present any difficulty.and no nipping of the tyre
can take place. It will also be obvious that repairs to the air tube can be effected
much more quickly than has hitherto been possible.
F
As above mentioned the invention is also applicable to tyres the outer covers of
which do not have ribs upon their edges but are rendered inelastic, for example,
by suitable insertions. In this arrangement the outer cover, which is provided
with the protective cover as above described can be applied to the rim, after the
air tube has been placed in position, with perfect safety and remains attached
thereto, it not being necessary for the grooves or recesses in the rim for the recep-
tion of the tyre to have any particular shape or depth. On the contrary, such
grooves or recesses can be, within certain limits, of any suitable breadth and
depth.

page_text: For securing the edges of the protective cover small screw bolts may be pro-
vided, the heads of which are embedded in one edge and both heads and nuts
being of a flat shape and of relatively large diameter.
Dated the 11th day of February 1899.
Improvements in or connected with Pneumatic Tyres.
We, Dr. ALBERT GERLACH, of 11, Nienburgerstrasse, Chemist, and AUGUST
ERNST, of 4, Dessauerstrasse, Head Foreman, both of Hanover, in the German
Empire, 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 improvements in or connected with pneumatic tyres.
The fitting of pneumatic tyres, provided with an outer cover as manufactured
hitherto, upon the rim of a wheel is a difficult and inconvenient practice and is
also accompanied by the disadvantage that the air tube very frequently becomes
nipped between the edges of the cover and twisted in one or more places so that
very frequently rupture or damage takes place.
Now, it is the object of this invention to obviate these disadvantages and to
this end we apply inside the outer cover a special protective cover which is
cemented or otherwise secured to the tread portion of the outer cover, that is to
say, it forms one piece with the outer cover at this part and, when closed, is of
such a size that the air tube fits thereinto.
For securing the edges of the protective cover when folded over the inner tube
small screw bolts may be provided, the heads of which are embedded in one edge
and both heads and nuts being of a flat shape and of relatively large diameter.
To enable the invention to be fully understood we will describe it by reference
to the accompanying drawing, in which;--
Figure is a transverse section of a tyre made according to the invention the
parts being shewn opened out; and
Figure 2 is a transverse section of a tyre in position upon a wheel rim.
a is the inner or air tube and b is the outer cover.
which is cemented to the inside of the tread portion of the outer cover b, as clearly
c is our protective cover
shewn in Figure 1, so that the said outer cover is formed with lateral flaps b₁, bl
and the protective cover c with lateral flaps c¹, c¹. The flaps c¹, c¹ are adapted to be
folded around the inner tube a before the tyre is placed in position upon the rim.
and are of such a size that when closed the air tube just fits therein. d shews
one of the screw bolts by means of which the flaps c¹, c¹ are secured in position
around the inner tube a. The said screw bolts d, d have their heads embedded in
the edge of one of the lateral flaps c¹ the screw-threaded shanks projecting exter-
nally therefrom and being adapted to pass through holes e, e formed in the edge
of the other flap c¹, the whole being held together by means of nuts f as clearly
shewn in Figure 2. It will be obvious, however, that other means for securing
the edges of the lateral flaps c¹, c¹ can be employed in lieu of these screw bolts.
The edges of the lateral flaps 1 are plain, that is to say, are not provided with
inextensible insertions as it is found that by providing the protective cover with
an inner lining of fabric, such as canvas, cut on the bias the tyre is held upon
the rim, when the inner tube is inflated, without other means of attachment.
With tyres constructed as above described the air tube a is laid in the pro-

page_text: tective cover c and the edges of the lateral flaps c¹ of this cover are then secured
together in the manner above described. In this operation no difficulty is experi-
enced in laying the tube straight and evenly in position as it is visible at every
point before the protective cover is closed up. After the air tube a is inserted
and the protective cover closed around its whole periphery the tyre can be easily
fitted on to the rim without the fear of the inner tube a being nipped, this being
effected by folding the flaps 61, 61 under the closed protective cover c, placing the
tyre upon the rim and inflating the inner tube a in the usual manner.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
A pneumatic tyre consisting of an inner tube contained in an inner protective
cover made with canvas cut on the bias and having flaps fastened by studs or their
equivalents and which cover is secured to an outer cover or tread having loose
flaps folded under the tube and in the rim, substantially as described and illus-
trated.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.