Improvements relating to the Inflation of Pneumatic Tyres and to Apparatus therefor.
Year: 1896

page_text: Date of Application, 10th Nov., 1890
Complete Specification Left, 13th Aug., 1897-Accepted, 6th Nov., 1897
Application, TULI NOV., 100
Complete Specification Left, 13th Aug., 1897-Accepted, 6th Nov., 1897
PROVISIONAL SPECIFICATION.
Improvements relating to the Inflation of Pneumatic Tyres and to
Apparatus therefor.
I, JOHANNES MATTHIAS DUMSTREY, of No. 27 Markgrafen Strasse, Berlin, in
the Empire of Germany, Manufacturer, do hereby declare the nature of this inven-
tion to be as follows:-
My invention relates to an improved method of inflating pneumatic tyres and to
improved apparatus therefor.
The object is to provide means for rendering the employment of air-pumps
unnecessary in the inflation of pneumatic tyres and to substitute for the manual
operation an automatic method of inflation.
My improved method consists in connecting the tyre to be inflated with a
receptacle containing a suitable gas or air in a state of compression and then
allowing the said gas or air to escape into the tyre and thereby to inflate the same.
I preferably employ for this purpose metal flasks or receptacles filled with carbonic
acid gas in a compressed state, these flasks or other similar receptacles of gas being
a well known article of commerce. I connect such Hask or receptacle to the
pneumatic tyre by means of the usual piece of rubber tubing and then, by opening
the valve of the flask or receptacle, I allow the gas under pressure to escape
into the tyre and thereby to inflate the same. Upon the tyre having thus become
filled with gas to the desired pressure, I close the escape valve of the flask or
receptacle and disconnect the same from the tyre.
In order to provide for a certain maximum of pressure not being exceeded in
the tyre, I preferably connect with the piece of rubber tubing above referred to
a suitable valve or other equivalent device so adjusted that, upon the counter-
pressure of oras or air within the pneumatic tyre having attained a certain pre-
determined height, the said valve or other device will open a by-passage,
whereupon the gas or air, now escaping from the latter, will either operate a
signal device, such as a whistle, to thereby indicate that the desired pressure bas
been attained within the tyre and that the escape-valve of the flask or receptacle
must now be closed, or the escaping gas or air will operate the valve to auto-
matically close the passage between the flask or receptacle and the tyre.
One form of my improved apparatus to be used for this purpose consists in a
valve having a by-passage communicating with the general passage for the gas
or air and discharging into the open air the body of the said valve being so arranged
and adjusted that it will normally keep the said by-passage closed, but that it will
open the same and allow the gas or air to escape therethrough into the atmosphere
when the resistance of the counter-pressure within the inflated tyre has become
so great as to prevent the further passage of gas or air into the tyre.

page_text: In the apparatus above described the said by-passage is preferably constructed
in the form of, or provided with, a whistle or other signalling device, which will
be sounded by the gas or air escaping through the said by-passage.
In a modification of the apparatus the said by-passage is provided with an
enlargement or chamber having a diaphragm arranged transversely therein, the
said diaphragm acting upon a valve body which controls the general passage for
the air or gas, the arrangement and adjustment being such that, upon the counter-
pressure within the tyre having attained a certain height, the said diaphragm will
be operated to cause the valve to, close the said passage for the gas or air.
Dated this 16th day of November 1896.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.
Improvements relating to the Inflation of Pneumatic Tyres and to
Apparatus therefor.
I, JOHANNES MATTHIAS DUMSTREY, of No. 27 Markgrafen Strasse, Berlin, in
the Empire of Germany, Manufacturer, do hereby declare the nature of this inven-
tion 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 an improved method of inflating pneumatic tyres and to
improved apparatus therefor.
The object is to provide means for rendering the employment of air-pumps
unnecessary in the inflation of pneumatic tyres and to substitute for the manual
operation an automatic method of inflation.
My improved method consists in connecting the tyre to be inflated with a
receptacle containing a suitable air or gas in a state of compression and then
allowing the said air or gas to escape into the tyre and thereby to inflate the same.
I preferably employ for this purpose metal flasks or receptacles filled with air or
gas in a compressed state, these flasks or other similar receptacles being a well
known article of onmerce. I connect such flask or receptacle to the
pneumatic tyre by means of the usual piece of rubber tubing and then, by opening
the valve of the flask or receptacle, I allow the air or gas under pressure to escape
into the tvre and thereby to inflate the same. Upon the tyre having thus become
filled with air or gas to the desired pressure, I close the escane valve of the flask or
receptacle and disconnect the same from the tyre.
In order to provide for a certain maximum of pressure not being exceeded in
the tyre, I preferably connect with the piece of rubber tubing above referred to
a suitable valve or other equivalent device so adjusted that, upon the counter-
pressure of air or gas within the pneumatic tyre having attained a certain pre-
determined height, the said valve or other device will open a by-passage,
hereupon the gas or air, now escaping from the latter, will either operate a
ignal device, such as a whistle, to thereby indicate that the desired pressure has
been attained within the tyre and that the escape-valve of the flask or receptacle
must now be closed, or the escapin air or gas will operate the valve to auto-
matically close the passage between the flask or receptacle and the tyre.
One form of my improved apparatus to be used for this purpose consists in
valve having a by-passage communicating with the general passage for the air or

page_text: gas and discharging into the open air, the body of the said valve being so arranged
and adjusted that it will normally keep the said by-passage closed, but that it will
epen the same and allow the gas or air to escape therethrough into the atmosphe
when the resistance of the counter-pressure within the inflated tyre has become
so great as to prevent the further passage of air or gas into the tyre.
In the apparatus above described the said by-passage is preferably constructed
in the form of, or provided with, a whistle or other signalling device, which will
be sounded by the air or gas escaping through the said by-passage.
In a modification of the apparatus the said by-passage is provided with an
enlargement or chamber having a diaphragm arranged transversely therein, the
said diaphragm acting upon a valve body which controls the general passage for
the air or gas, the arrangement and adjustment being such that, upon the counter-
pressure within the tyre having attained a certain height, the said diaphragm will
be operated to cause the valve to close the said passage for the air or gas.
In the accompanying drawing illustrating the invention
Figures 1 and 2 are an elevation and a central vertical section, respectively, of
the upper portion of a flask or receptacle and connected valve for limiting the
pressure of the compressed air or gas to be admitted into the pneumatic tyre from
the said flask or receptacle, and
Figure 3 is a central vertical section of a modification drawn to a smaller scale.
Referring to Figures 1 and 2, B is the upper portion of a flask or receptacle
supposed to be filled with compressed air or gas and provided with a cock, such
as H, for allowing the said compressed air or gas to be discharged therefrom when
desired. M is a coupling nut serving to secure the valve to the threaded top
portion G of the said Hask or receptacle as shown in the drawing. The said valve
shown in Figures 1 and 2 is preferably constructed as follows:-The tubular
body V is provided with a lateral extension S having an opening o² for the escape
of the compressed air or gas to be admitted into the tyre to be inflated. o' is a
lower inlet opening for the air or gas and o³ is a small opening which is no.malıy
kept securely closed by a valve body v under the pressure of a spring f acting
thereon. By means of an adjustable abutment 9 the pressure of the spring f
may be so varied as to allow the latter to yield only to a certain predetermined
counter-pressure of the air or gas at the opening o³, so as to then allow the air or
gas to escape through this opening. In the rear of the abutment y is provided a
whistle P adapted to be sounded by the escaping air or gas.
The operation of the device above described is as follows:-The pneumatic tyre
to be inflated is connected with the valve, secured as above described to the flask B,
by drawing a connecting piece of India-rubber tubing over the outer end of the
Upon
lateral extension S and securing the same thereon in any usual manner.
the cock H of the flask or receptacle B having then been opened, the compressed an
or gas escaping therefrom will pass through the opening o³ of the lateral exten-
When the tyre has thus been
sion S into the tyre, thereby inflating the latter.
filled with air or gas and the pressure therein has reached a certain degree, the
valve will, upon the said degree of pressure becoming exceeded, be thereby raised
from its seat, thus allowing the surplus air or gas to pass through the opening o
and to escape from the whistle P into the open air, the said whistle being sounded
thereby to indicate that the tyre has been been inflated to the proper extent. The
cock H is thereupon closed and the tyre disconnected from the lateral extension S
of the valve, the valve at the same time closing automatically and the device
being now ready for the inflation of another tyre in the manner above described.
In the modified construction of valve shown in Figure 3 the tubular portion V
is formed at its one end with an enlargement or chamber K provided within with
a diaphragm m the latter separating the greater portion of the space within the
said chamber from open air. The openings o¹ and 2 as well as the lateral exten-
sion S correspond essentially with the parts designated by the same letters of
reference in Figures 1 and 2. The diaphragm m is under the action of a spring,
the pressure of which may be regulated according to requirements by means of an

page_text: adjusting screw R. With the inner or lower side of the said diaphragm_is
connected a valve body s, the same being so arranged as to normally leave the
valve opening free for the passage of the compressed air or gas for inflating the
pneumatic tyre, but to be lifted against its seat so as to close the said valve opening,
upon the said diaphragm being bent outward against the action of its spring f.
is a safety valve provided in the side of the tubular portion V and preferably
combined with a whistle in a similar manner as described with reference to the
device shown in Figures 1 and 2.
The operation is as follows:-Upon the tyre to be inflated having been connected
at S, as described, and the cock H of the flask or receptacle B having then been
opened, the compressed gas or air passes through the valve opening o³ into the
chamber K and thence through the onening o2 of the lateral extension S into the
tyre. As the tyre becomes filled and the pressure within the chamber K increases,
the diaphragm m will be gradually bent upward more and more against the
pressure of the spring f. This will continue until such time when the valve
body s will be pressed against its seat el, thereby closing the valve opening o³ and
stopping the further passage of the compressed air or gas.
The pressure of the spring f against the diaphragm m may be so regulated as
to cause the valve body s, to close the opening o and to thus completely cut off the
supply of gas just as soon as a certain predetermined pressure of air or gas will
have been reached within the tyre, so that all unnecessary escape of air or gas will
then he prevented. Upon the cock H being closed and the inflated tyre discon-
nected from the lateral extension S, the valve body s will automatically open-the-
passage at o³ under the pressure of the spring f acting on the diaphragm, and the
device is then ready again for another operation.
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:-
1. The method of inflating pneumatic tyres oy connecting the tyre to be
inflated, with a closed receptacle containing air or gas under pressure,
allowing the said air or gas to escape from the said receptacle into
the tyre until a certain counter-pressure is reached, utilizing the counter-
pressure thus produced, for causing the escaping air
or gas to auto-
matically onen a side passage to thereby indicate that the desired
pressure has been reached, then cutting off the connection to stop the further
passage of air or gas to the tyre, and finally disconnecting the latter from the
receptacle, substantially as and for the purpose described.
2. The method of inflating pneumatic tyres by connecting the tyre to be
inflated, with a closed receptacle containing air or gas under pressure, allowing
the said air or gas to escape from the said receptacle into the tyre until a certain
counter-pressure is reached, utilizing the counter-pressure thus produced, for
automatically cutting off the connection beween the said receptacle and the tyre
to thereby ston further passage of air or gas, and finally disconnecting the
latter from the said receptacle, substantially as and for the purpose described.
3. A valve for use in inflating pneumatic tyres as described, means for cou-
necting the said valve with a closed receptacle and with the tyre to be inflate 1,
a passage for the air or gas through the said valve, an outlet opening to said
passage and a spring-controlled valve body for normally keeping the said outlet
opening closed and adapted to open the same upon a certain counter-pressure
being reached, substantially as and for the purpose described.
4. A valve for use in inflating pneumatic tyres as described, means for con-
necting the said valve with a closed receptacle and with the tyre to be inflated,
a passage for the air or gas through the said valve and means for automatically
closing the said passage upon a certain counter-passage being reached, substantially
as and for the purpose described.
5. The arrangement and combination of parts substantially as described and
shown with reference to Figures 1 and 2.

page_text: 6. The arrangement and combination of parts substantially as described and
shown with reference to Figure 3.
Dated this 13th day of August 1897.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.