Improvements in Self-inflating Tyres for Bicycles and other Vehicles.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Self-inflating Tyres for Bicycles and other Vehicles.
We, JAMES FREDERICK EVERETT, of Langham House, Stafford Road, Walling-
ton, in the County of Surrey, Civil Engineer, and ARTHUR KIRKMAN, of The
Limes, Stafford Road, aforesaid, Accountant, do hereby declare the nature of
this invention to be as follows:-
-
These improvements refer to self-inflating tyres for bicycles and other vehicles,
in which one or more so called pumping tubes are employed in connection with
the pneumatic tube or tyre for the purpose of inflating the latter in a selfacting
manner by the mere weight of the rider and vehicle while in motion. The
invention consists essentially in providing a metallic or other band between the
rim and the pumping tube and another such band between the pumping tube
and the pneumatic tube or tyre; the first named band is attached to the rim and
the ends may be connected or abutting; this band serves to raise the pumping
tube away from the rim, and the other band forms a medium for compressing
the pumping tube so to say independently of the pneumatic tyre, so that the
pressure in the former may be sensibly above the pressure in the latter. This
last named band is fixed at one end directly or indirectly to the rim, the other
end being free to move according to the pressure. The bands if of metal may
suitably be of aluminium covered with canvas.
Dated this Tranter sesond day of August 1898
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.
Improvements in Self-inflating Tyres for Bicycles and other Vehicles.
We, JAMES FREDERICK EVERETT, of Langham House, Stafford Road, Walling-
ton, in the County of Surrey, Civil Engineer, and ARTHUR KIRKMAN, of The
Limes, Stafford Road, aforesaid, Accountant, 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:-
Our invention relates to improvements in that class of self-inflating tyres for
bicycles and other vehicles, in which one or more so-called pumping tubes are
employed in connection with the pneumatic tube or tyre for the purpose of
inflating the latter in an automatic manner by the mere weight of the rider and
vehicle while in motion.
Figure 1 of the accompanying sheet of drawings represents part of a wheel
rim and a so-called "single tube" tyre in longitudinal section and,

page_text: Figure 2 is a transverse section thereof on the line A-B Figure 1.
Figure 3 shows part of a wheel rim and a so-called "double-tube" tyre in
longitudinal section and
Figure 4 is a transverse section thereof on the line C-D Figure 3.
Referring to Figures 1 and 2 it will be seen that the invention consists essen-
tially in providing a metallic or other band e (hereinafter referred to as the
inner band) between the rim and the pumping tube f and another such band g
(hereinafter referred to as the outer band) between the pumping tube f and the
air tube or pneumatic tyre h. The inner band e is mounted in the hollow of
the rim i and is or may be attached thereto the ends being connected or abutting
but preferably so as to afford a smooth surface at the join. This inner band e
serves to raise the pumping tube away from the rim i thus affording a flat sur-
face on which the pumping tube f can operate and so as not to interfere with
the nipples on the ends of the spokes or the spokes themselves and to cover
any holes such as spoke holes there may be in the rim. The inner band e is
suitably made of aluminium and is or may be covered with canvas or other suit-
able material as shown at k. The pumping tube f is also covered with canvas
see Figure 2 or at least is made inextensible. The outer band g is or may be
of aluminium and enclosed with canvas m or other suitable material which is
solutioned to the air tube h and the said band forms a medium for compressing
the pumping tube f so to say independently of the pneumatic tyre so that the
pressure in the pumping tube may be sensibly above the pressure in the air
tube h. The air tube h is covered with canvas n or is otherwise made inexten:
sible and canvas o is solutioned so as to enclose the inner band, the pumping
tube, the outer band, and all or part of the air tube which is or may be pro-
vided with a thickened tread p. Air is admitted through a dust cup or filter g
in the ordinary manner to the pumping tube f which does not extend quite all
round the wheel and as the wheel revolves the sides of the said tube f meet and
air is forced all round until it passes through the back pressure valve by the
pipe into the air tube h. The pipe passes through the thimble which is
attached to the outer band g and the thimble further passes freely through a
hole in the rim so as to be in a manner attached thereto. and yet permit of the
free action of the outer band to effect the compression of the pumping tube f,
the other end of the outer band g being free to move both radially and circum-
ferentially. The space between the ends of the pumping tube is or may be
filled up with an india rubber cushion or the ends of the said tube may be
closer together.
t
As shewn in Figures 3 and 4 the inner band e is between the rim i and the
pumping tube f and the outer band g between the said pumping tube and the
air tube or pneumatic tyre h. The inner bande is mounted in the hollow of the
rim and is or may be attached thereto, the ends being connected as aforesaid.
This inner band e is or may be covered with canvas as shown at k and the pump-
ing tube is also covered with canvas 7 as shown at Figure 4 or at least is made
inextensible. The outer band g is or may be covered with canvas on one or
both sides and in this construction is shown to overlap at its ends in such manner
as not to nip the air tube h. The said ends may be loosely connected together
by a stud and a slot or in any other convenient manner if necessary.
The canvas o surrounds the inner band the pumping tube the outer band and
the air tube the edges of said band being solutioned or attached together in
any convenient manner.
The other parts of this construction are the same as described with reference
to Figures 1 and 2.
Having now particularly described and ascertained the nature of our said in-
vention and in what manner the same is to be performed, we declare that what
we claim is: :-
1. A self inflating tyre consisting of an inner band encircling the rim of the

page_text: wheel a pumping tube surrounding the said inner band, an outer band encircling
the pumping tube, an air tube encircling the outer band and means for allowing
of the inlet of air to the pumping tube and of the outlet of air therefrom to the
air tube.
2. A self inflating tyre consisting of an inner band encircling the rim of
the wheel, an inextensible pumping tube surrounding the said inner band, an
outer band encircling the pumping tube adjustably attached at one end and
free at the other end, an inextensible air tube encircling the outer band, the
whole being secured together and means for allowing of the inlet of air to the
pumping tube and of the outlet of air therefrom to the air tube substantially
as set forth.
3. A self inflating tyre consisting of an inner band encircling the rim of the
wheel in combination with an inextensible pumping tube surrounding the said
inner band, an outer band encircling the pumping tube adjustably secured at
one end and free at the other end an inextensible air tube encircling the outer
band, the whole being secured together, an air inlet provided with a dust cap
attached to one end of the pumping tube, a non-return valve attached to the other
end of the pumping tube and a connection from the said valve to the air tube
substantially as described and shewn.
4. A self inflating tyre consisting of an inner band encircling the rim of the
wheel in combination with an inextensible pumping tube surrounding the said
inner band, an outer band encircling the pumping tube adjustably secured at
one end and free at the other end an air tube, encircling the outer band, the
whole being enclosed by an outer cover and the rim, the said outer cover, an
air inlet provided with a dust cap attaclied to one end of the pumping tube, a
non-return valve attached to the other end of the pumping tube and a connection
from the said valve to the air tube substantially as described and shown.
Dated this Twant thinl
J
1000
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.