Improvements in Apparatus for the Automatic Inflation of Pneumatic Tyres.
Year: 1899

page_text: Date of Application, 10th Oct., 1899
Complete Specification Left, 10th July, 1900-Accepted, 11th Aug., 1900
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for the Automatic Inflation of Pneumatic
Tyres.
I, CHARLES CASMAN, of No. 50, Rue de la Gaité, Anderlecht, near Brussels, in
the Kingdom of Belgium, Engineer, do hereby declare the nature of this inven-
tion to be as follows:-
:-
The object of this invention is an air-pump for the automatic inflation of pneu-
matic tyres and intended to be applied to the rim of the wheel and to the
air chamber of the tyre thereof in such a manner that when the tyre is in use
and is partially deflated the periodical compression of that part of the tyre
where the pump is fixed each time that part comes in contact with the ground,
has the effect of actuating the pump and producing introduction of air into the
air chamber of the tyre.
I will describe my invention with reference to the accompanying drawing
which represents in vertical section, double the actual size, an air pump made
according to my invention in connection with the air chamber of the pneumatic
tyre of a bicycle.
The barrel 1 of the pump is made in one piece with the socket which is screwed
to the tube 18 of the air chamber of the tyre and is furnished at the top with
a cap 2 having a central hole into which is screwed a screw threaded tube 13
permitting of the connection therewith of a hand pump. Within the said cap 2
and cast in one with it is a socket 14 on to which is screwed a cap 15 pierced
with a central hole corresponding to that in the cap 2. In the chamber formed
by the socket 14 and its cap 15 is placed a small rod 16 the ends of which
occupy the openings of the caps 2 and 15. This rod has near its top a cone-
shaped enlargement or flange 17 faced with a leather washer 19. Surrounding
the rod 16 is a spiral spring 20 which spring bears at its ends against the said
flange and the bottom of the cap 15 and presses the said leather washer 19
against the opening of the cap 2 which opening is likewise bell mouthed or
conical in order to increase the tightness of the closure.
The piston is composed of two washers 3, 3 of leather or other yielding sub-
stance turned in opposite directions against the inner side of the barrel of
the pump and separated by a metal washer 4 against which they are compressed
between a disc 5 soldered or otherwise fixed to the top of the hollow rod 6 and
the projecting edges of a cap 7 siniilar to the cap 15 which cap 7 is screwed
onto a socket cast in one piece with the disc 5. The chamber formed by this
socket and the cap 7 contains a valve similar to that of the cap 2 which valve
consists of a rod or stem S having a shoulder or enlargement furnished with a
leather washer 9 and a spring 10. The screwed tube or sleeve 18 on which the
pump screws is cone shaped at its end and is screwed against a washer 21 of
leather or similar material placed at the bottom of the socket 12.
The hollow rod 6 of the piston, which is capable of working freely in the
tube 18, terminates near the entrance to the air chamber of the tyre, and the

page_text: interior of its lower part screw threaded to receive the end of a screw threaded
solid rod 22 which passes through the air chamber of the tyre and the other end
of which is jointed to ears or lugs on a plate 23 fixed to the inner side of the
air chamber of the tyre by means of an outer plate 24.
The openings 25 of the hollow rod 6, constituting passages through which air
passes from the said tube into the air chamber of the tyre, are within the
screwed tube 18.
This arrangement strengthens the piston rod and prevents bending and twist-
ing thereof in the air chamber when the tyre passes over an obstacle in the rod.
The apparatus acts as follows:-
-
When the part of the tyre to which the pump is applied becomes flattened by
contact with the ground the rod 22 drives back the piston, the air which is
compressed in the barrel of the pump presses the valve 17 against its seat and
opens the valve 9 by which it passes into the air chamber of the tyre through
the hollow rod the openings 25, and the space between the rod 6 and the
screwed tube 18.
As soon as the part of the tyre to which the pump is applied ceases to be in
contact with the ground the spring 11 brings back the piston to the lower part
of the barrel of the pump, permitting inflow of air by the valve 17 and causing
closure of the valve 9.
Dated this 10th day of October 1899.
W. T. WHITEMAN,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Apparatus for the Automatic Inflation of Pneumatic
Tyres.
I, CHARLES CASMAN, of No. 50, Rue de la Gaité, Anderlecht, near Brussels, in
the Kingdom of Belgium, Engineer, 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:-
The object of this invention is an air-pump for the automatic inflation of pneu-
matic tyres and intended to be applied to the rim of the wheel and to the
air chamber of the tyre thereof in such a manner that when the tyre is in use
and is partially deflated the periodical compression of that part of the tyre
where the pump is fixed each time that part comes in contact with the ground,
has the effect of actuating the pump and producing introduction of air into the
air chamber of the tyre.
I will describe my invention with reference to the drawing accompanying my
Provisional Specification which drawing represents in vertical section, double
the actual size, an air pump made according to my invention in connection with
the air chamber of the pneumatic tyre of a bicycle.
The barrel 1 of the pump is made in one piece with the socket which is screwed
to the tube 18 of the air chamber of the tyre and is furnished at the top with
a cap 2 having a central hole into which is screwed a screw threaded tube 13
permitting of the connection therewith of a hand pump.
Within the said cap 2
and cast in one with it is a socket 14 on to which is screwed a cap 15 pierced
with a central hole corresponding to that in the cap 2. In the chamber formed
by the socket 14 and its cap 15 is placed a small rod 16 the ends of which
occupy the openings of the caps 2 and 15. This rod has near its top a cone-

page_text: shaped enlargement or flange 17 faced with a leather washer 19. Surrounding
the rod 16 is a spiral spring 20 which spring bears at its ends against the said
Hange and the bottom of the cap 15 and presses the said leather washer 19
against the opening of the cap 2 which opening is likewise bell mouthed or
conical in order to increase the tightness of the closure.
The piston is composed of two washers 3, 3 of leather or other yielding sub-
stance turned up in opposite directions against the inner side of the barrel of
the pump and separated by a metal washer 4 against which they are compressed
between a disc 5 soldered or otherwise fixed to the top of the hollow rod 6 and.
the projecting edges of a cap 7 similar to the cap 15 which cap is screwed
onto a socket cast in one piece with the disc 5. The chamber formed by this
socket and the cap 7 contains a valve similar to that of the cap 2 which valve
consists of a rod or stem 8 having a shoulder or enlargement iurnished with a
leather washer 9 and a spring 10. The screwed tube or sleeve 18 on which the
pump screws is cone shaped at its end and is screwed against a washer 21 of
deather or similar material placed at the bottom of the socket 12.
The hollow rod 6 of the piston, which is capable of working freely in the
tube 18, terminates near the entrance to the air chamber of the tyre, and the
interior of its lower part is screw threaded to receive the end of a screw threaded
solid rod 22 which passes through the air chamber of the tyre and the other end
of which is jointed to ears or lugs on a plate 23 fixed to the inner side of the
air chamber of the tyre by means of an outer plate 24.
The openings 25 of the hollow rod 6, constituting passages through which air
passes from the said tube into the air chamber of the tyre, are within the
screwed tube 18.
This arrangement strengthens the piston rod and prevents bending and twist-
ing thereof in the air chamber when the tyre passes over an obstacle in the rod.
The apparatus acts as follows:-
When the part of the tyre to which the pump is applied becomes flattened by
contact with the ground the rod 22 drives back the piston, the air which is
compressed in the barrel of the pump presses the valve 17 against its seat and
opens the valve 9 by which it passes into the air chamber of the tyre through
the hollow rod 6 the openings 25, and the space between the rod 6, and the
screwed tube 18.
As soon as the part of the tyre to which the pump is applied ceases to be in
contact with the ground the spring 11 brings back the piston to the lower part
of the barrel of the pump, permitting inflow of air by the valve 17 and causing
closure of the valve 5.
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 I
claim
In apparatus for the automatic inflation of pneumatic tyres of the kind herein-
before specified :-
First A piston comprising in combination two leather washers turned up in
contrary directions against the inner side of the pump barrel, a disc cast with a
screw threaded socket fixed at the end of the hollow rod which communicates
with the air chamber, a cap, with a central opening, screwed on the socket of
the disc and pressing the leather washers against the said disc, a valve for clos-
ing the opening in the cap consisting of a rod having a conical enlargement
faced with a leather washer one end of which rod is engaged in the said opening
and the other end in the hollow rod of the piston, and a spring tending to hoid
the washer on the enlargement of the said rod against the opening in the cap
substantially as hereinbefore described and illustrated in the drawing referred to."
Secondly: An arrangement for admission of air to the pump comprising a
screw threaded socket cast in one with the closing cap of the pump barrel and

page_text: having a central opening, a cap having a corresponding opening screwed on the
said socket and a valve to close the opening of the pump cap comprising a rod
which extends through the two holes in the caps and has a conical enlargement
faced with a leather washer and has arranged in combination with it a spring
which presses the washer on the said enlargement against the said opening sub-
stantially as herein before described and illustrated in the drawing referred to.
Thirdly: A piston rod formed of a tubular part of which one end is open
above the piston disc and the other end, which has openings in its sides, extends
to near the entrance of the air chamber of the tyre and of a solid part one
end of which is screwed into the said tubular part and closes it above
the entrance to the said air chamber and the other end of which solid part
passes across the said chamber and is jointed to a plate fixed to the inner side
of the said chamber substantially as herein before described and illustrated in
the drawing referred to.
Fourthly The general arrangement and combination of the several parts
as herein before described and illustrated in the drawing referred to.
Dated this Tenth day of July 1900.
W. T. WHITEMAN,
Agent for the Applicant.