An Improved Valve adapted for Inflating and Deflating Pneumatic Tyres or for the like purposes.
Year: 1897

page_text: Date of Application, 4th Mar., 1897
Complete Specification Left, 19th Oct., 1897-Accepted, 24th Dec., 1897
"An Improved Valve adapted for Inflating and Deflating Pneumatic
Tyres or for the like purposes.'
"
We, CHARLES LAURENCE, of 5, Walker Place, North Shields, in the County of
Northumberland, Mariner, and EDWIN MAXWELL, of 4, Rutland Road, Bedford, in
the County of Bedford, Engineer's Traveller, do hereby declare the nature of this
invention to be as follows:-
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1
Our Invention relates to non-return valves and consists in a novel construction
or combination of parts which by its arrangement and action is especially adapted
for use in connection with the pneumatic tyres of cycles, but is obviously adapted
for use in connection with inflatable articles generally such as air cushions.
In describing this invention we will refer to its use with pneumatic tyres from
which its application to other purposes will be readily understood, a pneumatic
tyre being taken as representing inflatable articles or receptacles generally to
which our said invention is usefully applicable.
The object and advantages of this invention' are that whilst the efficiency of the
valve is ensured in the manner hereinafter described the tyre can be more easily
inflated than heretofore, and also deflated and removed from the rim without dis-
turbing the working parts of the valve or detaching it from the said pneumatic
tube.
The valve consists of an outer casing which is secured in position in the usual
or any suitable manner the inner end or flange forming the valve seat. The valve
proper or valve disc is external to the casing and is supported by a spindle fitting
into a guide hole bored endwise and centrally through the valve casing. This
spindle is furnished at the outer end with a spiral spring arranged to abut against
the valve casing and a nut on the valve spindle, so that the valve is automatically
kept tight to its seat. Air passages extend through the valve casing so that air
forced through them acts upon the valve which opens when the resistance of the
spiral spring is overcome. As soon as the air pressure from without is withdrawn
the valve is automatically closed and in maintaining the requisite airtight contact
between the valve face and its seat, the internal pressure of the air when the tube
is inflated assists the action of the spiral spring. The upper end of the casing is
furnished with the usual cap onto which the air pump is screwed or the cap may
be dispensed with and the air pump is then screwed direct on to the casing.
Dated this 3rd day of March 1897.
G. J. CLARKSON,
Chartered Patent Agent, Stockton-on-Tees,
Agent for the Applicants.

page_text: "An Improved Valve adapted for Inflating and Deflating Pneumatic
Tyres or for the like purposes."
We, CHARLES LAURENCE, late of 5, Walker Place, North Shields, in the County of
Northumberland, and now of 12 Albert Square, Ella Street, Hull, in the County
of York, Mariner and EDWIN MAXWELL of 4 Rutland Road, Bedford, in the County
of Bedford, Engineer's Traveller. 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:-
Our Invention relates to non-return valves and consists in a novel construction
or combination of parts which by its arrangement and action is especially adapted
for use in connection with the pneumatic tyres of cycles, but is obviously adapted
for use in connection with inflatable articles generally such as air cushions.
In describing this invention, we will refer to its use with pneumatic tyres from
which its application to other purposes will be. readily understood, a pneumatic
tyre being taken as representing inflatable articles or receptacles generally to
which our said invention is usefully applicable.
The object and advantages of this invention are that whilst the efficiency of the
valve is ensured in the manner hereinafter described the tyre can be more easily
inflated than heretofore, and also deflated and removed from the rim without dis-
turbing the working parts of the valve or detaching it from the said pneumatic
tube, or the valve can be bodily detached from its seat or mounting for the
of inspection and removal.
purposes
Fig. 1 is an elevation and Fig. 2, a section of a non return valve constructed
according to our invention.
Figs. 3 and 4 are sectional plan views on line x x of Fig. 2.
Fig. 5 is a section of a modification of our invention.
Return valves as hitherto made use of for inflating or deflating the air tubes 2
of pneumatic tyres are open to improvement in certain respects for instance where
the inlet port is sheathed over with an elastic covering, this by unequal expansion
during inflation and constant strain soon gets out of order and requires frequent
renewal; furthermore the working parts of such valves must be removed to deflate
the tube, or to detach the valve from its mounting; or when the valve has been a
otherwise constructed as on the principle of a valve worked on a valve stem passing
through the casing and in those respects similar to the valve to which our inven-
tion applies the valve and valve seat have not been accessible and have intruded
into the air tube to an extent which has been found a serious disadvantage. By
our invention which we will now proceed to explain by referring to the accompany- 3
ing drawing, all these defects or disadvantages are overcome, as we dispense with
the form of inlet requiring an elastic sheath and whilst our improved valve can be
bodily removed from its mounting or attachment without disturbing the working
parts thereof, these working parts are readily accessible, and the air tube or
chamber can be deflated through the valve as well as inflated.
4
The valve consists of an outer casing a which is.detachably secured to a mount-
ing b which mounting is itself permanently or detachably secured in position to
the walls or casing of the air chamber c in the usual or any suitable manner. The
inner end or flange a¹ of the casing a forms the valve seat, which is furnished with
a pad of rubber to ensure a tight joint. The valve proper or valve disc d is external
to the casing a and is supported by a spindle filling into a guide hole e bored 4
endwise and centrally through the valve casing a. This spindle is furnished at
the outer end with a spiral spring f arranged to abut against the valve casing and
a nut g on the valve spindle, so that the valve is automatically kept tight to its seat.

page_text: Air passages el extend through the valve casing so that air forced through them
acts upon the valve which opens when the resistance of the spiral spring f is over-
come. These air passages e¹ are formed by saw slots cut into the central hole e as
shown in Fig. 3, or instead of the saw slots, holes e³ may be drilled through to the
face of the valve as shown in Fig. 4. As soon as the air pressure from without is
withdrawn, the valve is automatically closed by the spring and in maintaining the
requisite air tight contact between the valve face and its seat the internal pressure
of the air when the tube is inflated assists the action of the said spiral spring f.
The upper end or nipple of the casing is furnished with a coven on to which the
air pump is screwed at h¹ or the cover may be dispensed with and the air pump
screwed direct on to the casing at a³ as shown in fig. 5. The part a³ of the casing
is made flat or square so that by one or two turns of a spanner the whole of the
valve can be taken out and the rubber on the valve face renewed on the valve itself
can be examined and repaired. The air tube may also be deflated in
this manner because as soon as the india-rubber joint is broken,
leakage will take place through the screw threads which the india rubber washer j.
is intended to prevent. But the usual mode of deflating is of course by pressing
the valve spindle and opening the valve.
In addition to the advantages of this valve as already set forth, is that while it
is outside of the tyre a long bearing surface is provided for the valve spindle d¹ to
prevent the valve "wobbling" in its seat and furthermore the spring f can be
easily regulated by simply removing the cover h if there be one and altering the
check nut g.
The action of the valve is as follows;-
When the tyre is to be charged with air, the pumping device is attached to the
cover h. or the screwed part a by screwing it thereon. The spiral spring f will
on the forcing stroke of the pump yield to allow air to pass the valve, and the air
is forced inwards by the pump and the said spring will return the valve proper to
its seat at each return stroke of the pump so that the valve acts as a non-return
valve. When the pump is removed the valve is automatically closed by the action
of the spiral spring f aided by the internal pressure of the air.
On removing the cover h the valve spindle can be readily forced inwards to
allow the air under pressure to escape when required.
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.) A valve for the purposes described, the said valve consisting of an outer casing
terminating inwardly in a valve seating and having air passages extending through
to the valve seating and of a valve proper having a spindle extending through the
said casing and furnished with a spiral spring for automatically closing the valve,
the said valve being detachably secured to a mounting extending from the air tube
or chamber substantially as hereinbefore described and so that the valve proper
is seated and operated outside the air chamber and is accessible.
2.) The improved valve for inflating and deflating air tubes and the like, con-
structed, mounted and operating substantially as and for the purposes as herein-
before described with reference to the accompanying drawing.
Dated this 16th day of Feraher
G. J. CLARKSON,
Chartered Patent Agent, Stockton-on-Tees & Hull.
Agent for the Applicants..