An Improved Patching Material for the Repair of Air Tubes and Covers of Pneumatic Tyres.
Year: 1899

page_text: Date of Application, 14th Oct., 1899-Accepted, 13th Jan., 1900
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COMPLETE SPECIFICATION.
An Improved Patching Material for the Repair of Air Tubes and
Covers of Pneumatic Tyres.
I, EDWARD BELL RAPER, of 19, Low Ousegate, York, India Rubber Dealer,
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:―
Hitherto patching material has consisted of a sheet of rubber made to adhere
to one side of a supporting fabric of cotton or other fibre the strands of which
are either actually a warp & weft running at right angles to each other or con-
sist of two layers of filaments held together by cement and running the one
layer at right angles to the other like a warp & weft though not connected
with each other by weaving.
In my patching material I either use textile fabric or filaments united by
cement.
1. In the former case I follow the plan described above and make my
rubber sheet adhere to a texture in the ordinary way. then further take a
second similar texture of warp and weft and lay it flat with cement on the first
one in such a way that the strands of the second fabric be at some angle that
is less than a right angle (and preferably at an angle of forty five degrees) with
the strands of the first fabric. This has the effect of preventing the material
thus built up from stretching freely in any direction-a desideratum in patching
materials.
This is the mode of construction that I prefer.
2. I may however attain the same object by using three or more layers of
parallel filaments superimposed one layer upon another and held together by
cement. If I use three layers only I so dispose them that the filaments of each
layer make an angle of about sixty degrees with the filaments of each of the
other layers. If I use four layers I so dispose them that each layer lies at right
angles with one other layer and at an angle of forty five degrees with the other
two layers. In this case the positions of the fibres are similar to those described
in the first mode of construction.
In the accompanying sheet of drawings aaa and 666 are the warp and weft
respectively of the first texture (or their equivalent filaments), and c c c d d d are
the warp and weft of the superimposed texture (or their equivalent filaments).
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:-
A patching material for the repair of air tubes and covers of pneumatic tyres
in which the supporting canvas is either: 1. In the form of two co-hoering

page_text: textures in which each set of strands is at right angles to one other set and at
an angle that is less than a right angle with two other sets.
Or is 2. In the form of three layers of filaments of which each layer is at an
angle or about sixty degrees with each other layer.
Or is 3. In the form of four or more layers of filaments each of which is at
right angles to one other layer and at an angle less than a right angle with two
other layers.
Dated this 13th of October 1899
EDWARD BELL RAPER.