Improvements in Valves for Inflating and Deflating Pneumatic Tyres, and for like Purposes.
Year: 1891

page_text: Date of Application, 11th Nov., 1891
Complete Specification Left, 27th May, 1892-Accepted, 2nd July, 1892
PROVISIONAL SPECIFICATION.
Improvements in Valves for Inflating and Deflating Pneumatic
Tyres, and for like Purposes.
I, WILLIAM GREENWOOD of 76 and 78 Manchester Road, Rochdale in the
County of Lancaster, Cycle Agent, do hereby declare the nature of this invention
to be as follows:-
The object of my invention is to provide a simple and effective valve for
inflating and deflating pneumatic tyres and other articles of rubber or similar
material.
In carrying out my invention I turn or form a metallic plug or block somewhat
like a bolt that is to say a short shaft threaded at one extremity carries at the
other a rim or head (or the end may be plain) at a short distance from this rim or
head I form a circular flange or plate say about double the diameter of the shaft.
I drill through or near the centre of the shaft a fine hole or passage terminating
about half way between the flange or plate and the end or head of the shaft and
from the side and at right angles to the passage through the shaft I drill a second
hole or passage forming the outlet over the end of this shaft and encircling
the space between the rim and the flange or plate I place a rubber or like band.
The threaded end of the shaft is then passed through the rubber wall of the tyre
and I then push over the shaft a metal washer the shaft is then passed through the
aperture provided in the rim and a second metal washer is passed over the shaft
which is square at that portion filling the aperture in the rim a thumbscrew or fly
nut then follows riding on the thread and screwing all tightly together the
usual air pump is used and may be attached in any way and I provide a metal
cap to screw on the end in order to prevent dirt or mud entering.
The action of the valve is as follows. The air is pumped in through the fine air
passage and forces a way underneath the rubber band which after each stroke of
the pump closes the aperture and prevents return. To deflate the tyre it is only
necessary to unscrew the nut or thumbscrew and the air forces its way through
the hole in the rubber through which the valve passes.
Or as a modification I may drill the air passage straight through the block or
shaft from end to end and cover the head by means of a rubber cap large enough
to also cover the space beyond the flange or plate and in this case I form a small
hole in the side of the rubber cap through which the air is forced on entering by
the action of the pump but through which it cannot return.
Dated this 9th day of November 1891.
POPPLEWELL & Co.,
17 & 18, Southampton Buildings, London, W.C.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Valves for inflating and Deflating Pneumatic
Tyres, and for like purposes.
I, WILLIAM GREENWOOD of 76 and 78 Manchester Road, Rochdale in the
County of Lancaster, Cycle Agent, 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 :-
The object of my said invention is to provide a simple and effective valve for
inflating and deflating various articles of indiarubber or like material but to be

page_text: more particularly used for inflating or deflating pneumatic tyres and I will proceed
to describe one of my valves as applied to a pneumatic tyre mounted or fixed on
the rim of a velocipede and for the purpose of more clearly indicating the
construction of my said valve I shall refer to the accompanying sheet of drawings
on which
Figure 1 is a section of a valve fitted to the rim of a velocipede wheel and to a
pneumatic tyre mounted thereon, also shown in section.
Figure 2 is a general view of a valve showing the cap detached, both figures
being drawn to an enlarged scale.
In carrying out my said invention 1 form or turn a metallic plug or block A
somewhat like a bolt, that is to say, the shaft A threaded throughout the greater
part of its length say from a to b carries at one extremity a rim or head B and at a
short distance from this head I form a circular flange or plate C say about double
the diameter of the shaft. I drill through or near the centre of the shaft a fine
hole or passage D terminating between the flange C and the rim B and at the side
say at E and at right angles to the passage D I drill a short hole or passage e
communicating with D and so forming the inlet.
Over the end of the shaft and encircling the portion between B and C I place a
rubber or like elastic band F so covering the hole or inlet at E. Above the
flange C the shaft is circular and smooth for a short distance to pass the wall of
the tyre and a circular washer H placed over the tyre and between it and the rim
of the wheel. Above this I shoulder and square the shaft as at J so as to fit a
square or similar hole in the rim and prevent the shaft turning round when in
position, the remainder of the shaft is threaded as before described.
The threaded end is passed through the wall of the tyre and the flange C rests
against the underside, the washer H is then passed over and rests on the tyre, the
shaft is then passed through the hole in the rim K and the squared or angled
portion remains therein. I then pass over the shait another circular metallic
washer shaped at its underside to fit close up to the rim K and secure the same
by means of thumbscrew or flynut M which when screwed home binds the whole of
the parts with the rim and wall of the tyre tightly together. A metal cap N
screwed on to the top of the valve prevents the entrance of dust, mud, etc.
The action of the valve is as follows. An air pump being attached to the end
of A and actuated, air passes through the passage D and forces a way out at E
underneath the rubber band which after each stroke of the pump recloses the
aperture by returning to its bed or seat and so prevents return of the air.
In order to deflate the tyre it is only necessary to release or loosen the nut M
when the air can escape through the hole in the tyre. Or, as a modification, I may
drill the passage D straight through from end to end of the shaft A and cover the
end by means of a rubber or like cap sufficiently large to extend up to the flange C,
and form a small bole in the side of the cap through which the air may be forced
by the action of the pump but will not be able to return.
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. In valves for inflating pneumatic tyres and for similar purposes the use of a
rubber or like elastic band or cap for the purpose of covering the inlet and
preventing the return of air substantially as described.
2. The means and apparatus for inflating and deflating pneumatic tyres and for
analogous purposes substantially as hereinbefore described and as illustrated by
the accompanying drawings.
на
POPPLEWELL & Co.,
17 & 18, Southampton Buildings, London, W.C.,
Agents for the Applicant.