Improvements in Pneumatic Tires.
Year: 1894

page_text: Date of Application, 31st Oct., 1894
Complete Specification Left, 31st July, 1895-Accepted, 19th Oct.,
1895
PROVISIONAL SPECIFICATION.
Improvements in Pneumatic Tires.
We GRANVILLE HAWLEY EGERTON COOKE, Engineer, and THOMAS
COOKE, M.D. F.R.C.S. both of 40 Brunswick Square, in the County of London,
do hereby declare the nature of this invention to be as follows :-
:-
This invention for improvements in pneumatic tires relates to tires having an
outer removable cover and an inner inflatable air tube; and has for its object to
render it impossible for the inflatable air tube to become gripped or pinched
between the sides of the usual rim and the edges of the outer cover when inflating
the tire; and consists essentially in constructing the air tube so that normally it
tends with a greater or lesser degree of force to take a mean diameter greater than
the diameter of the rim.
In carrying this invention into practical effect the air tube is expanded by an
elastic ring or circular body of larger diameter than the normal mean diameter of
the air tube and placed within or secured to the tube or is moulded so that
normally the tube assumes more or less the shape of a flat ring. The ring or body
may be of metal cane or other suitable rigid material or a small inflatable tube and
may be a complete endless ring or an incomplete ring or a plain adjustable ring or
the whole or a portion of the ring when made of wire may be in the form of a
helix or corrugated so that the diameter readily adjusts itself as the air tube is
being placed within the cover.
Dated this 31st day of October 1894.
WHEATLEY & MACKENZIE,
40 Chancery Lane, London, W.C.
Improvements in Pneumatic Tires.
We GRANVILLE HAWLEY EGERTON COOKE, Engineer, and THOMAS
COOKE, M.D. F.R.C.S. both of 40 Brunswick Square, in the County of London, 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 for improvements in pneumatic tires relates to tires having an
outer removable cover and an inner inflatable air tube, and has for its object to
render it impossible for the inflatable air tube to get or become gripped or pinched
between the sides of the rim and the edges of the outer cover when placing the
outer cover in position and to get out of position when the outer cover is being
removed; and consists essentially in constructing the air tube so that normally it
is held out from the bed of the rim or within the arch of the outer cover to which
it is applied.
In carrying this invention into practical effect the air tube is held out or
expanded by an elastic ring or circular body of larger diameter than the normal
mean diameter of the air tube, and placed within or secured to the tube so that
normally the tube assumes more or less the shape of a flat ring. The ring or body

page_text: may be of metal, caue or other suitable rigid inaterial or a small inflatable tube and
may be a complete endless ring or an incomplete ring or a plain adjustable ring or
the whole or a portion of the ring when made of wire may be in the form of a
helix or corrugated so that the diameter readily adjusts itself as the air tube is
being placed within the cover.
In the accompanying sheet of illustrative drawings
:-
Fig. 1 is a sectional elevation of an air tube constructed according to this
invention.
Figs. 2 and 3 are perspective elevations showing also the cross section of a
Dunlop or Welch pneumatic tire fitted with an air tube constructed according
to this invention showing the parts when the tire is inflated and deflated
respectively.
Figs. 4 and 5 are similar views to Figs. 2 and 3 showing a Cooke tire fitted with
the air tube and
Figs. 6 and 7 are similar views to Figs. 2 and 3 showing the Clincher tire fitted
with the air tube.
The air tube a is fitted internally with an endless ring 6 which holds out or
expands the tube a so that it assumes more or less the shape of a flat ring as shown
in Figs. 3, 5 and 7. The air tube can be fitted by passing the wire through an
open ended air tube then securing the ends of the wire by brazing, soldering,
bending together, or by a right and left screwed nipple and finally the tube is
stretched so that the ends of the tube overlap and the overlapping ends are
cemented together. Preferably the diameter of the ring when joined up is equal
to the internal diameter of the crown of the arch of the outer cover, that is the
diameter at c so that it cannot move about in the tube even when the tire is
inflated. It is not necessary that the ends of the wire b be firmly fixed together
but the ends must be protected so as not to injure the air tube and one end may
slide in or on the other.
The tube a need not be stretched on the ring but be simply held out in a
flabby condition by it. The object of the ring is to insure that the air tube
instead of lying in the bottom of the rim when deflated is suspended more or less in
the arch of the outer cover. The wire need not be an exact circle but can be
corrugated or otherwise bent so as to render it more or less flexible in the direction
of its length.
When there is any danger of the wire rubbing against or damaging the
inflatable tube means must be taken to provide against this as for example by
passing it through loops or tabs cemented on the inside of the tube so that it
is suspended inside the tube when the tire is fully inflated.
This invention may be applied to tubes after they have been made up either by
passing the wire into the inside of the tube, or if preferred by attaching it to the
outside in any convenient 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 :
1. The combination with the air tube of a pneumatic tire of a ring adapted
to support the air tube within the arch of the outer cover substantially as
described.
2. In a pneumatic tire the combintaion with an air tube and an outer cover of a
ring adapted to support the air tube within the arch of the outer cover substantially
as described.
Dated this 21st day of July 1805
WHEATLEY & MACKENZIE,
40 Chancery Lane, London, W.C., Agents.