An Improved Back Pressure Valve with Dust Cap for Pneumatic Tyres.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
An Improved Back Pressure Valve with Dust Cap for Pneumatic
Tyres.
I, ROBERT HONOLD, of 6, Militärstrasse, Stuttgart, in the Empire of Germany,
Student of Machinery, do hereby declare the nature of this invention to be 'as
follows:
:—
This invention has for its object a back pressure valve for pneumatic tyres,
more particularly intended for bicycles and the like.
The valve is shown in a longitudinal section in the accompanying drawing.
It is characterised by its very simple construction which renders it possible
to make the valve half the size of the valves at present employed and also by a
safety arrangement having the double object of closing the valve permanently
tightly and preventing the dust cap or cover from becoming accidentally loosened
during a journey.
:
In this improved valve the joint is formed of a ball A, instead of as at present
by means of india-rubber pipes and other complicated devices which easily
become ineffective and wear out, the said ball being arranged in the ordinary
tube or valve casing B which is screw-threaded on the outside, and grips the
wall of the air tube in the ordinary way between the flange b and the nut C
with a washer D between and which also grips the rim between the nuts C and E.
The ball A is prevented slipping out of the casing B by means of a stop 6 inserted
in the upper end of the same.
In order to obtain a thoroughly tight closing of the casing B after the pneu-
matic tyre has been inflated, the internally threaded cap F (the so-called dust
cap) which is screwed over the outer end of the valve and forms the dust joint,
is provided in a novel manner with a tapering core G having only very slight
adjustment:
This core G is firmly connected with the cap F and when the cap is screwed
up revolves with the same in its mouth until it is wedged quite fast therein and
completely closes it, thus firstly preventing any escape of air from the tyre, and
secondly entirely preventing any unintentional loosening of the cap F in conse-
quence of the great friction arising between the core Ġ and the inner wall of
the casing B.
The core G at the other side of the cap is prolonged in the form of a thin
pin Hof even thickness which serves in the ordinary way for insertion in the
mouth of the casing B for pushing the ball A downwards, in case the air tube
is to be entirely deflated.
:
30
1000

page_text: An Improved Back Pressure Valve with Dust Cap for Pneumatic
Tyres.
I, ROBERT HONOLD, of 6, Militärstrasse, Stuttgart, in the Empire of Germany,
Student of Machinery, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:
This invention has for its object a back pressure valve for pneumatic tyres,
more particularly intended for bicycles and the like.
The valve is shown in a longitudinal section in the drawing accompanying
the Provisional Specification.
It is characterised by its very simple construction which renders it possible
to make the valve half the size of the valves at present employed and also by a
safety arrangement having the double object of closing the valve. permanently
tightly and preventing the dust cap or cover from becoming accidentally :loosened
during a journey..
In this improved valve the joint is formed of a ball A, instead of as at present
by means of india-rubber pipes and other complicated devices which easily
become ineffective and wear out, the said ball being arranged in the ordinary
tube or valve casing B which is screw-threaded on the outside, and grips the
wall of the air tube in the ordinary way between the flange and the nut C
with a washer D between and which also grips the rim between the nuts C and E.
The ball A is prevented slipping out of the casing B by means of a stop bi inserted
in the upper end of the same.
In order to obtain a thoroughly tight closing of the casing B after the pneu-
matic tyre has been inflated, the internally threaded cap F (the so-called dust
cap) which is screwed over the outer end of the valve and forms the dust joint,
is provided in a novel manner with a tapering core G having only very slight
adjustment.
This core G is firmly connected with the cap F and when the cap is screwed
up revolves with the same in its mouth until it is wedged quite fast therein and
completely closes it, thus firstly preventing any escape of air from the tyre, and
secondly entirely preventing any unintentional loosening of the cap F in conse-
quence of the great friction arising between the core G and the inner wall of
the casing B. The core G at the other side of the cap is prolonged in the form
of a thin pin H of even thickness which serves in the ordinary way for insertion
in the mouth of the casing B for pushing the ball A downwards, in case. the
Fair tubo is to be entirely deflated:
'
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. A valve for pneumatic tyres of bicycles and for other like purposes charac-
terized by the combination of a back pressure ball valve (A) arranged in the
"ordinary tube or casing (B) with a safety device arranged over the same in
such a way that the back pressure ball valve has only to produce a tight closing
of the casing (1) during the inflation whilst when the tyre is inflated a sure
and permanent tight closing is produced by the safety device' arranged over the
ball valve, substantially as herein before set forth.
2. A valve such as described in which the safety device arranged outside the
ball valve is formed by means of a tapering core (G) firmly connected with the

page_text: cap (F) and having only slight adjustment, which core when the cap (F) is screwed
up on the casing (B) is wedged spirally quite firmly therein and forms an uncom-
monly tight joint and also prevents any unintentional loosening of the cap (F).
in consequence of the great friction arising between the core (G) and the inner
wall of the casing (B), substantially as described..
Dated this 16th day of November 1898.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.