Improvements in Pneumatic Tyres.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Pneumatic Tyres.
RALPH SELBY, 30, Blenheim Road, Wood Green, Middlesex, Engraver, do
hereby declare the nature of this invention to be as follows:-
It is a single tube pneumatic tyre. The upper half of the tyre, that is the part
that is stuck in the rim of the wheel, is inlaid with canvas in the ordinary way.
Two or three plys of canvas incorperated in the rubber. The lower half or the
tread of the tyre is rubber without canvas. Incircling each side of the tyre at
the junction of the canvas half and the rubber half is a ridge of rubber molded
on the tyre. The idea of the thick rubber ridges molded on the tyre is to keep the
metal shield in position. The sides of the shield being shaped to take the ridges,
which are kept in place by the pressure of the air in the tyre.
I, RALPH SELBY, of 30, Blenheim Road, Wood Green, in the County of Middle-
sex, 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:―.
My invention relates to single tube pneumatic tyres..
A tyre constructed according to my invention comprises an india rubber tube
united at its ends and having applied to or incorporated with a portion of its sur-
face layers of canvas or other suitable flexible protecting material the said canvas
or the like extending around those portions of the tube which lie in the wheel rim
when the tyre is in position and which constitute the sides of the tyre.
The tread side of the tube, that is to say, the outer periphery which is not pro-
tected by canvas or the like carries a metal shield, of the kind described in the
Specification of former Letters Patent granted to me No. 8973 of 1897. To permit
of fixing this ring in position the edges of the canvas protector of the tube aro
formed with ribs which engage in grooves formed in the lateral edges of the shield.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawing, in which :-
Figure 1 is a sectional view of a tyre constructed according to my invention
the parts being in the position which they occupy when the tyre is inflated.

page_text: Figure 2 is a view similar to Figure 1 but shewing the position of the parts
previous to the inflation:
Figure 3 is a section of the metal shield; and,
Figure 4 is a sectional view of the tyre with the shield removed.
a is the tube of the tyre, the ends of which are united so as to form a ring,
and 6 is the canvas or other covering which is applied to or incorporated with the
sides and inner periphery of the said ring the outer periphery c of the ring being
left exposed as shewn.
d, d' are the ribs or projections formed at the edges of the protecting portion b
of the tyre and e is the metallic shield which forms the tread of the tyre the said
shield having the lateral grooves f, f; g indicates the usual wheel rim.
In applying the tyre, the tube a, as shewn in Figure 4, is first of all placed on
the wheel rim g and then the sides of the said tube are pressed together so that
the ribs d, d can be inserted into the grooves f, f in the shield e which has pre-
viously been placed around the outer periphery of the tyre the parts thus occupy-
ing the position shewn in Figure 2.
When now the tube is inflated the unprotected rubber c expands between the
two ribs d and against the inner periphery of the shield e, as clearly shewn in
Figure 1, and, so holds the parts rigidly in position.
my
Having now particularly described and ascertained the nature of said
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. In a pneumatic tyre an india-rubber tube joined at the ends to form a ring
and having incorporated with or applied to the sides and inner periphery protect-
ing layers of canvas or other suitable flexible material the edges of the said pro-
tecting portion of the tyre being formed as ribs to enter grooves in a metal shield,
substantially as described.
2. In a pneumatic tyre the combination with a ring shaped india-rubber tube,
of canvas or the like incorporated with the said tube around a portion of the cir-
cumference of the said tube and a metal shield around the unprotected portion
of the circumference, the said shield being provided with grooves with which ribs
adjacent to the edges of the unprotected portion of the tyre engage, substantially
as described.
3. The manufacture and use of pneumatic tyres substantially as hereinbefore
described and illustrated in the accompanying drawing.
Dated this 2nd dow of Now 1898
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.