Improvements in Air Valves.
Year: 1897

page_text: Date of Application, 17th Apr., 1897-Accepted, 3rd July, 1897
Improvements in Air Valves.
I, WILLIAM DE LANY, Junior, of 22 King Street, West, in the town of Cobourg,
in the County of Northumberland, in the Province of Ontario, Canada, Jeweller,
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:—
-
My invention relates to improvements in Air Valves more particularly adapted
for pneumatic Tyres for Bicycles, and the object of the Invention is to design a
simple, positive and effectual form of valve which when closed will absolutely
prevent any escape of air through it and it consists essentially of a valve having
a plug provided with a leather washer, which is designed to be brought down
against a flat seat at the bottom of the upper chamber of the valve, the lower
portion of the plug having a stem, which is encircled by a spring held in the lower
portion of the valve and pressing against a pin in the stem, so as to normally exert
an upward pressure upon the plug, a closing stem be provided above the plug,
which is held in a cap provided with a screwed projection fitting into a
corresponding opening in the top of the valve, such cap being designed to be
screwed home, so as to press the central stem upon the centre of the plug, to hold
it securely upon its seat and such cap being designed to be removed and the stem
moved longitudinally inwardly therein after removal of the cap to press upon the
ring and hold it centrally in the upper chamber of the valve, so as to permit of
the deflation of the tyre as hereinafter more particularly explained.
Fig. 1, is a sectional perspective view of a valve showing it closed.
Fig. 2, is a similar view showing the valve with the cap removed.
In the drawings like letters of reference indicate corresponding parts in each
figure.
Heretofore it has been common in valves to have the plug located in the lower
portion of the valve, the upper portion of the plug having a stem which extends
into the upper portion of the valve. The upper portion of the plug is held by a
spring against its seat. In this construction the pressure of the air to the inside
of the valve helps to force it upon its seat. As, however, frequently dust accumu-
lates in the seat and the spring, which is necessarily a fine one becomes weak it
happens that the plug of the valve does not close directly upon its seat being
separated therefrom by small particles of dust and consequently the air gradually
escapes.
It is with the object of overcoming the difficulty experienced in this class of
valve and producing one which is positive and not depending upon the spring and
the pressure of the air for closing the valve that my invention is chiefly designed.
A is the lower portion of the valve, which is cylindrical in shape and provided
with an enlarged upper portion A', which is also cylindrical in shape and externally
threaded as indicated.. B is the plug of the valve, which is provided with the
usual centre 6 and a depending stem B¹. 6 is a pin extending through the
etem B' into the longitudinal grooves a made in the interior of the cylindrical
[Price 877

page_text: portion A.
a is the inturned end of the cylindrical portion A which forms a
hole a for the passage of the air.
spiral spring, which encircles the stem B₁ and extends between the
pin 6 and the inturned end a¹ of the cylindrical portion A of the valve.
C is a
D is a washer preferably of leather surrounding the stem B¹ at the lower side
of the plug B. The plug B is necessarily of smaller diameter than that of the
internal diameter of the enlarged cylindrical portion A¹
C¹ is the upper portion of the valve, which is provided with a central aperture c
internally threaded and downwardly depending flanges e internally threaded.
The upper portion is screwed down upon the exterior thread formed on the
cylindrical portion A¹.
E is a cap, which is provided with a downwardly extending projection e exteriorly
threaded and designed to be screwed into the central aperture c as indicated.
F is a split stem, which extends through a central aperture e¹ in the projection c.
The split stem F is provided with an enlarged lower end f, which has a conical
recess at its lower end designed when the cap E is screwed home to press against
the conical projection of the plug B and thereby hold the valve firmly down
upon its seat.
In the position shown in Fig. 1, it will be clearly seen that, as the plug B of the
valve is held with the washer ]) firmly down upon its seat A2, there will be no
possibility of any air escaping beyond the lower portion of the valve.
By unscrewing and removing the cap E the plug is caused by the spring C to
resume the position shown in Fig. 2, in which position it may be pressed down by
the stem F when thrust into the aperture e¹ and thereby allow the deflation of the
tyre, or the air to escape. By replacing the plug in the position shown in Fig. 1,
the cap may be screwed down again and the valve closed as indicated in Fig. 1.
In this form of valve it will be seen that the cap and stem positively close the
valve which therefore depends upon no spring except to throw it open and such a
spring may be made much stronger than those ordinarily employed in valves.
The pin extending into the groove a also serves to keep the plug B level so that
with the conical projection and the stem with conical recess it is always ensured
of being forced down securely upon its seat.
My invention also possesses a decided advantage in that am able to remove the
plug and spring from the lower cylindrical portion of the valve without removing
it from the rubber stem in the event of having to renew the leather washer a point
which will be greatly appreciated by manufacturers and repairers as they can
furnish their customers with extra washers.
It is of course understood that the rubber stem or mushroom is generally
attached to the lower portion of the valve by wire and therefore the advantage of
not having to remove the lower portion of the stem will be readily comprehended.
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. An air valve comprising the lower cylindrical portion provided with an
enlarged upper cylindrical end, the plug, the downwardly extending stem, a spring
encircling the stem and designed to normally exert an upward pressure upon the
plug, the cap with downwardly extending stem designed to be screwed into the
upper portion of the valve and exert a clamping pressure upon the plug, so as to
hold it on its seat as and for the purpose specified.
2. An air valve comprising the lower cylindrical portion provided with an
enlarged upper cylindrical end, the plug having a conical upwardly extending
projection, the downwardly extending stem, a spring encircling the stem and
designed to normally exert an upward pressure upon the plug, the cap with down-
wardly extending stem provided with conical recesses designed to be screwed into
the upper portion of the valve and exert a clamping pressure upon the plug, so as
to hold it on its seat as and for the purpose specified.
!

page_text: 3. An air valve comprising the lower cylindrical portion provided with an
enlarged upper cylindrical end, the plug, the leather washer situated beneath the
plug, the downwardly extending stem, a spring encircling the stem and designed
to normally exert an upward pressure upon the plug, the cap with downwardly
extending stem designed to be screwed into the upper portion of the valve and
exert a clamping pressure upon the plug, so as to hold it on its seat as and for the
purpose specified.
4. In an air valve, in combination the lower cylindrical portion having the
enlarged upper end forming a central chamber, the plug located in the chamber,
of less diameter than the same and having a downwardly extending stem, the pin
extending through the stem of the plug, the spiral spring encircling the stem and
grooves in the lower cylindrical portion into which the pin extends, the upper
portion of the plug closing the top of the central chamber and means for normally
holding the plug pressed down upon its seat as and for the purpose specified.
5. In combination the lower cylindrical portion having the enlarged upper end
forming a central chamber, the plug located in the chamber and of less diameter
than the same, a spring beneath the plug for exerting a normal upward pressure
upon it, the exterior thread formed on the outer wall of the central chamber, the
upper portion of the valve having a downwardly extending flange, which is screwed
on to the wall of the central chamber, the central aperture in the upper portion of
the valve internally threaded, the cap provided with a downward projection
externally threaded to fit the aperture and a projecting stem attached to or forming
part of the projection and designed to be brought to press against the plug, so as
to hold it on its seat as and for the purpose specified.
6. In combination, the lower cylindrical portion having the enlarged upper
end forming a central chamber, the plug located in the chamber and of less
diameter than the same, a spring beneath the plug for exerting a normal upward
pressure upon it, the exterior thread formed on the outer wall of the central chamber,
the upper portion of the valve having a downwardly extending flange, which is
screwed on to the wall of the central chamber, the central aperture in the upper
portion of the valve internally threaded, the cap provided with a downward pro-
jection externally threaded to fit the aperture and a split stem provided with au
enlarged lower portion, which is designed to be pressed against the top of the plug
as and for the purpose specified.
7. An air valve comprising the lower cylindrical portion provided with an
enlarged upper cylindrical end, the plug, the downwardly extending stem, a
spring encircling the stem and designed to normally exert an upward pressure
upon the plug, a cap closing the upper portion of the valve and means within the
cap for normally holding the plug pressed down upon its seat as and for the
purpose specified.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.