Automatic Inflating Apparatus for Pneumatic Tyres.
Year: 1893

page_text: Date of Application (in United Kingdom), 10th Nov., 1893
Complete Specification Left, 10th Sept., 1894-Accepted, 13th Oct., 1894
WOVIDIUNAL DE MOTNICATION.
Automatic Inflating Apparatus for Pneumatic Tyres.
I, JOSEPH DANISCHEVSKI, of 116, Rue du Faubourg Poissonnière, Paris,
France, Civil Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention has for its object to dispense with the ordinary pump for inflating
pneumatic tyres, and to provide a means whereby the tyre is automatically inflated
at every revolution of the wheel just to the extent that inflation may be necessary,
the operation being dependent upon the flattening, under the weight of the load,
of the part of the tyre in contact with the ground, so that the amount of inflation
is proportioned to the weight of the rider and excessive inflation is impossible.
The invention consists in the combination, with a pneumatic tyre, of an elastic
air bag or pouch located either within or without the air chamber of the tyre and
provided with air inlet and outlet valves, whereby each time it is compressed
air drawn into it at the previous expansion is forced into the air chamber of the
tyre.
This air compression pouch may be arranged in various ways, and I will describe
with reference to the annexed drawing out one example only of each of the
arrangements which may be employed, viz.first, one in which the pouch is enclosed
within the air chamber and, secondly, one in which the pouch is mounted outside
said chamber.
Figure 1 represents a vertical part sectional elevation of a velocipede wheel
having a pouch lodged within the air chamber of the tyre; Figure 2 is a transverse
vertical section; and Figure 3 an exterior view of the same.
Figures 4 and 5 represent, in elevation and transverse section, the arrangement
of the air compression pouch on the inside of the wheel rim.
The arrangement represented in Figures 1 to 3, which is the one preferred owing
to there being no external fittings liable to injury, consists of a flexible bag or
pouch of suitable dimensions lodged within the air chamber a and provided with
a suction orifice c projecting slightly upon the inside of the rim and with a
compression orifice d, for the air thus drawn iu, projecting within the air chamber.
The orifice d may be provided with any suitable valve and preferably consisting
of an india-rubber nipple slitted at its extremity.
Two of these bags or pouches are shewn in the drawing as contained within the
tyre, but it will be understood that one only, or more than two, may be applied.
At each revolution of the wheel a sufficient quantity of air is compressed to ensure
the perfect and continuous inflation of the pneumatic tyre, the action taking place
under the following special conditions :-The more forcible the compression of the
pouch, the greater will be the quantity of compressed air forced into the tyre, and
the more perfect the inflation. Now it will be evident that the compression will

page_text: be always proportionate to the weight of the rider, and that consequently the same
machine will serve indifferently, with equal advantage, for either a light or heavy
person. The compression pouch may be formed by reserving in the tyre itself, by
means of divisions, a space into which air is drawn from the exterior and discharged
into the air chamber at each compression as before described.
In the arrangement shewn in Figures 4 and 5, the air bag bis placed at any
suitable point of the inner circumference of the wheel rim and is compressed by
means of a small treadle lever e pivoted on a fixed point the end of which is forced
inwards by the ground when the tyre is insufficiently inflated, as is also the case
with the type of pouch contained within the air chamber illustrated in Figures 1
to 3. The mode of working is, therefore, such that the degree of inflation of the
pneumatic tyre is regulated, without the aid of any special appliance, automatically
and in proportion to the load, inasmuch as it is the load itself which determines the
extent of the compression of the air and consequently of the inflation. This
characteristic result cannot be obtained by the use of pumps, in the working of which
there is nothing to indicate the limit at which the compression becomes dangerous
to the chamber.
1
זג.
1040
J.
DANISCHEVSKI,
By A. M. & Wm. Clark,
53, Chancery Lane, London, Chartered Patent Agents.
COMPLETE SPECIFICATION.
Automatic Inflating Apparatus for Pneumatic Tyres.
1 JOSEPH DANISCHEVSKI of 116 Rue du Faubourg Poissonnière Paris France,
Engineer, 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 has for its object to dispense with ordinary pumps for inflating
pneumatic tyres and to provide a means whereby the tyre is automatically inflated
at every revolution of the wheel, just to the extent that inflation may be necessary.
The degree of inflation being proportionate to the compression of the part of the
tyre that is in contact with the ground, the extent of the inflation varies with the
weight of the rider, thus rendering excessive inflation impossible.
My invention consists in the combination with a pneumatic tyre of an elastic bag
or pouch provided with inlet and outlet valves, which bag or pouch may be situated
either within or without the air chamber of the tyre and may be fixed to and
arranged in combination with the tyre or rim of wheel in any suitable way. By
this means each time the air bag is compressed, air drawn into it at the previous
expansion is forced into the air chamber of the tyre.
And in order that my said invention may be fully understood, I will now describe
the same with reference to the drawing accompanying the Provisional Specification
in which
Fig. 1 represents a partly sectional elevation of a velocipede wheel having an air
bag or pouch lodged within the air chamber of the tyre, Fig. 2 shews a transverse
vertical section, and Fig. 3 a full elevation of the same.
Fig. 4 shews an elevation and Fig. 5 a transverse vertical section of a velocipede
wheel having an air bag or pouch on the inside of the wheel rim.
The same letters denote the same parts in all views.
a shews air chamber of tyre b elastic air bag or pouch of suitable dimensions
⚫ shews suction orifice of air bag b; d compression orifice for injecting air into the
air chamber a e Figs. 4 and 5 shews small treadle lever pivotted on a fixed point f
the end of which is forced inwards by the ground when the tyre is insufficiently
inflated.

page_text: In the arrangement represented in Figs. 1 to 3 (which is the one preferred owing
to there being no external fittings liable to injury) the action is as follows.
At each revolution of the wheel the air bag b is compressed to a degree dependent
upon the inflation of the tyre, and air is forced through the orifice d (which may
be provided with any suitable valve and would preferably consist of an india rubber
nipple slit at its extremity) into the air chamber a. It will be seen that the more
forcible the compression of the pouch 6 the greater will be the quantity of
compressed air forced into the tyre and the more perfect the inflation, and the
compression being in proportion to the weight of the rider the same machine will
serve with equal advantage for either light or heavy persons.
Two of the pouches are shewn in the drawings as contained within the tyre, but
one only or more than two may be used.
I may form the compression pouch by reserving in the tyre itself, by means of
divisions, a space into which air is drawn from the exterior, and discharged into the
air chamber at each compression as before described.
In the arrangement shewn in Figs. 4 and 5 the air bag b is placed at any
suitable point of the inner circumference of the wheel rim and is compressed by
means of the small treadle lever e pivotted at the fixed point f. When the tyre is
insufficiently inflated the end of this lever e is forced inwards by the ground in the
same way as the pouch b is compressed in the arrangement before described, and air
is discharged into the air chamber a.
The tyre is thus inflated automatically and in proportion to the load. This
result cannot be obtained by the use of pumps, in working which there is nothing
to indicate the limit at which the compression becomes dangerous to the air
chamber.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
(1.) In means for inflating pneumatic tyres, the combination with the tyre, of
one or more elastic bags or pouches located either within or without the air chamber
of the tyre substantially as and for the purpose set forth and shewn in the
accompanying drawing.
(2.) Automatic and continuous inflating apparatus for pneumatic tyres, substan-
tially as and for the purpose set forth.
Dated this Tenth day of September 1894.