Improvements in Air Valves for Pneumatio Tyres.
Year: 1894

page_text: -
Date of Application, 10th Oct., 1894
Complete Specification Left, 6th Nov., 1894 -Accepted, 8th Dec., 1894
PROVISIONAL SPECIFICATION.
Improvements in Air Valves for Pneumatio Tyres.
I, JOHN COCKBURN, Superintendent, North British Rubber Company (Limited),
Mechanical Department, Castle Mills, Edinburgh, do hereby declare the nature of
this invention to be as follows'!—
This invention has for its object to provide a valve for the air tubes of pneumatic.
tyres which can be maintained air tight against seats both on the valve tube
attached to the air tube and wheel rim and on the central self closing spring stem
fitted therein.
The improved valve comprises the usual tubular casing formed with a flange by
means of which and of screw nuts it is secured to the air tube of the tyre and the
wheel rim. Within this tube is fitted a stem piece having a milled portion to give
clearance within the tube for the passage of the air used to inflate the tyre and a
reduced inner portion surrounded by a helical spring bearing on shoulders or collars.
on the stem and on the inner end of the valve tube. The end of this stem is by
the action of the spring, pressed against an annular rubber faced valve which is
connected to the valve tube by a coupling ring screwed on to the screw-threaded
end of said tube the annular valve stem being screw-threaded at its outer end for
attachment of an inflator.
The rubber faced valve not only bears on the end of the stem piece but when
the coupling ring is screwed on to the valve tube the rubber face is drawn up into
close contact with the end of the valve tube and thus forms.an air-tight valve to
both seats or faces. Further to ensure that the end of the stem piece shall bear
hard on the valve face a screwed stud or pin is passed through the orifice in the
annular valve stem and into a screw-threaded orifice tapped in the stem whereby
the latter is drawn into positive contact with the face of the valve. The face of
the valve may be composed of rubber, leather or other suitable substance, and it
may be fitted in a recess in the valve stem or around a central projecting rim in
order that when under pressure it may not close the air inlet.
Dated this 9th day of October 1894.
WALLACE FAIRWEATHER,
Chartered Patent Agent,
62, Saint Vincent Street, Glasgow, Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Air Valves for Pneumatio Tyres.
I, JOHN COCKBURN, Superintendent, North British Rubber Company (Limited),
Mechanical Department, Castle Mills, Edinburgh, 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 a valve for the air tubes of pneumatic
tyres which can be maintained air tight against seats both on the valve tube
attached to the air tube and wheel rim and on the central self closing spring stem
fitted therein."
As illustrated in vertical section at Figure 1, and in elevation attached to the
tyre at Figure 2, the improved valve comprises the usual, tubular casing A. formed
Paine &

page_text: with a flange B by means of which and of screw nuts C and D it is secured to the
air tube E of the tyre and the wheel rim F. Within this tube is fitted a stem
piece G having a milled portion g to give clearance within the tube for the passage
of the air used to inflate the tyre and a reduced inner portion g¹ surrounded by a
helical spring bearing on shoulders or collars 9 on the stem and on the inner
end of the valve tube A. The end of this stem G is by the action of the spring,
pressed against an annular rubber faced valve H which is connected to the valve
tube A by a coupling ring I screwed on to the screw-threaded end of said tube the
stem H¹ of the annular valve being screw-threaded at its outer end for attachment
of an inflator.
The rubber faced valve H not only bears on the end of the stem piece G but
when the coupling ring is screwed on to the valve tube A the rubber face is drawn
up into close contact with the end of the valve tube and thus forms an air-tight
valve to both seats or faces. Further to ensure that the end of the stem piece
shall bear hard on the valve face a screwed stud or pin J is passed through the
orifice in the annular valve H and into a screw-threaded orifice tapped in the
stem G whereby the latter is drawn into positive contact with the face of the valve.
The face of the valve may be composed of rubber, leather or other suitable
substance, and it may be fitted in a recess in the valve stem or around a central
projecting rim has shewn in order that when under pressure it may not close the
air inlet.
Having now particularly described' and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1
An air valve for pneumatic tyres constructed substantially as described with
reference to the annexed drawings.