Improvements in Air Valves.
Year: 1896

page_text: Date of Application, 14th Jan., 1896
Complete Specification Left, 13th Oct., 1896-Accepted, 12th Dec., 1896
Improvements in Air Valves.
We, PETER FYFE, Chief Sanitary Inspector, and WILLIAM DEWAB,
Draughtsman, both of 1 Montrose Street, in the City of Glasgow, do hereby
declare the nature of this invention to be as follows:-
This invention has for its object to provide an air valve of improved
construction and designed more especially for permitting inflation of and
inaintaining air pressure in the cells of pneumatic hubs or sleeves such as are
described in the Specification of Letters Patent No. 25,185 of 1894 though also
applicable to pneumatic tyres and for like use.
The improved air valve is composed of a tubular casing having a number of
tubular branches radiating from a central air chamber. Within the tubular
casing is fitted a stem piece having on it a collar faced on one side by a washer of
leather or like material the said faced collar forming a valve adapted to bear
against an internal flange forming a valve seat within the tubular casing. The
portion of the valve stem projecting beyond the valve seat is surrounded by a
helical spring bearing at one end on the back of the valve seat or on a specially
formed shoulder whilst it is retained at its other end by a screw nut on the end of
the stem which is screw threaded to receive the nut. At this end the tubular
casing is screw threaded to retain a closing cap and to serve for the attachment of
an inflator. When screwed on to the valve stem the nut serves to draw the valve
down on its seat and completely closes the passage of air through the valve seat
from the air chamber and its branches to or from the screw threaded end of the
casing; and the screwing on of the nut short of the point at which the valve is
closed hard on its seat serves to apply more or less pressure to the spring. Before
attaching the inflator the nut is unscrewed slightly so as to permit of the valve
rising from its seat against the power of the spring on the operation of the inflator,
the nozzle of which when attached may serve by pressing on the nut to lift the
valve, through the pressure of the air delivered by the inflator may alone be used
for this purpose. After charging the cells of the hub or of the tyre or other
article to be inflated, the inflator is removed and the nut screwed home.
Escape of the air in the hub or tyre is then prevented by the valve which is
kept closed by the air pressure acting on it, by the action of the spring and by the
nut all acting in the same direction.
When the valve is applied to a pneumatic tyre or in connection with any article
having a single air cell, the lateral branches of the tubular casing are omitted,
but when the branches are provided they terminate in the air chamber above the
valve.
Dated this 13th dor of Tonne 1000

page_text: Improvements in Air Valves.
We, PETER FYFE, Chief Sanitary Inspector, and WILLIAM DEWAR,
Draughtsman, both of 1 Montrose Street, in the City of Glasgow, 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 provide an air valve of improved construction
and designed more especially for permitting inflation of and maintaining air pressure
in the cells of pneumatic hubs or sleeves such as are described in the Specification
of Letters Patent No. 25,185 of 1894 though also applicable to pneumatic tyres,
and for like use.
The invention is illustrated by the accompanying drawings
Figure 1 being a vertical section and Figures 2 and 3 plan views from opposite
ends; while Figure 4 is an clevation and Figure 5 a plan of a modification of the
improved valve as designed to be applied to a pneumatic tyre.
Figure 6 shows in section the nozzle of an inflator which is screwed on to the end
of the valve when the cap is removed.
The improved air valve is composed of a tubular casing A having a number of
tubular branches a radiating from a central air chamber a'. Within the tubular
casing A is fitted a stem piece B having on it a collar faced on one side by a
washer of leather or like material & the said faced collar being of less diameter
than the air chamber and forming a valve adapted to bear against an internal
flange a forming a valve seat within the tubular casing A, the tubular branches
radiating from a point above the valve seat. The portion of the valve stem B
above the upper side of the valve b has feathers 6 formed upon it to guide the
valve to its seat, one of the feathers entering a groove a³ in the air chamber a¹ to
prevent the stem from turning; and the portion projecting beyond the valve seat a
is surrounded by a helical spring C bearing at one end on the back of the valve
seat a² or on a specially formed shoulder whilst it is retained at its other end by a
nut D on the end of the stem B which is screw threaded to receive the nut. At
this end the tubular casing A is screw threaded to retain a closing cap
E and to
serve for the attachment of an inflator. When screwed on to the valve stem B
the nut D serves to draw the valve b down on its seat and completely closes the
passage of air through the valve seat a from the air chamber a¹ and its branches a
to or from the screw threaded end of the casing A, and the screwing on of the
nut D short of the point at which the valve b is closed hard on its seat a² serves to
apply more or less pressure to the spring C. Before attaching the inflator the
nut D is unscrewed slightly so as to permit of the valve b rising from its seat
against the power of the spring C on the operation of the inflator, the nozzle of
which when attached may serve by pressing on the nut D to lift the valve b,
though the pressure of the air delivered by the inflator may alone be used for this
purpose. After charging the cells of the hub or of the tyre or other article to be
inflated, the inflator is removed and the nut D screwed home.
Escape of the air in the hub or tyre is then prevented by the valve b which is
kept closed by the air pressure acting on it, by the action of the spring C and by
the nut D all acting in the same direction.
When the valve is applied to a pneumatic tyre or in connection with any article
having a single air cell, the lateral branches of the tubular casing are omitted and
the construction of the air valve as shown by Figures 4 and 5. In this case the
valve b is formed on the end of the valve stem B and the screwed end of said stemn

page_text: enters a tapped hole in the cover, the turning of which closes the valve 6 firmly
upon its seat a². The valve b in this case fits the air chamber, an annular recess a
being formed close to the valve seat a² to prevent the valve rubber rising with the
opening of the valve..
The nozzle E represented in Figure 6 is so constructed that when it is screwed
on to the air valve, a projecting lip e formed on it presses upon the valve nut D to
raise the valve from its seat, a rubber or other washer e surrounding the lip e
bearing against the lower end of the valve to prevent the escape of air.
Having now particularly described and ascertained the nature of our said inven-.
tion, and in what manner the same is to be performed, we declare that what we
claim is
1. The improved multiple branched air valve constructed substantially as.
described with reference to Figures 1, 2 and 3 of the accompanying drawings.
2. The improved air valve constructed substantially as described with reference
to Figures 4 and 5 of the accompanying drawings.
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather, Chartered Patent Agents,.
62 St. Vincent Street, Glasgow, Agent for the Applicants.