Improvements in Valves for Pneumatic Tyres.
Year: 1897

page_text: INAL DIECIFICATION.
Improvements in Valves for Pneumatic Tyres.
I, JOHN HARRISON, of 13, Brook Street, Peterborough, in the County of North-
ampton, Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to valves for pneumatic tyres and has for its object to sim-
plify the construction and increase the efficiency of the same.
A valve constructed according to my invention comprises a T-piece the stem
of which is externally screw threaded and designed to be fixed to the air bag
and rim in any desirable manner. The said stem is also made tubular and has
the cross-head formed as a clip for holding a piece of india-rubber tubing or the
like which forms the valve proper. Through the stem extends a shank provided
with a cross bar which is introduced into and fits in the metal tubing held by
the clip.
When air is forced through this valve it passes between the shank and the
stem and thence between the cross bar of the shank and the india-rubber tubing
which latter it distends slightly in a well known manner. The flexibility of the
india-rubber prevents the backward passage of air until pressure is applied to the
end of the shank, which projects out of the stem, when the india-rubber tube is
stretched or expanded to form a passage for the air between the cross bar of the
shank and the india-rubber tube.
I sometimes construct the india-rubber valve so that instead of being clipped
in the cross head of the stem it is turned over and cemented or otherwise fixed to
a flange or collar on the end of the said stem.
Dated this 22nd day of November 1907
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
Improvements in Valves for Pneumatic Tyres.
I, JOHN HARRISON, of 13, Brook Street, Peterborough, in the County of North-
ampton, Engineer, 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 valves for pneumatic tyres and has for its object to sim-
plify the construction and increase the efficiency of the same.
A valve constructed according to my invention comprises a tubular T-piece the
stem of which is externally screw-threaded and designed to be fixed to the air
bag and rim in any desirable manner, whilst the cross-head of the said T-piece
has fixed to it a block or piece of india-rubber or the like, which forms the valve
[Price 8d1

page_text: proper and is hereinafter referred to as such, the said valve proper having a hole
extending longitudinally through it and a transverse hole between the longitu-
dinal hole and the passage through the stem of the T-piece. In the longitudinal
hole in the valve proper is a bar or plate which has attached to it a rod or shank
which extends through the stem and projects slightly beyond the end of the same
so as to permit of moving the said bar or plate to open the valve to allow the
escape of air.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawing, in which:-
Figure 1 is a side elevation of the improved valve:
Figure 2 is an end elevation: and,
Figure 3 is a plan:
Figure 4 is a section on the line 4-4 Figure 2; and,
Figure 5 is a view similar to Figure 4 but shewing the parts in a different
position:
Figure 6 is a view of the valve proper detached.
Figures 7 and 8 are an elevation and a sectional view respectively illustrating a
modification of my invention.
Similar letters of reference indicate corresponding parts in the several figures.
a is the tubular stem of the T-piece and b is a plate or flange formed upon,
or fixed to, the said stem and constituting the cross-head of the said T-piece.
The said stem is externally screw-threaded, the thread on one part being designed
to receive the nut c for clamping the air bag against the usual spring plate d and
the nut e for securing the valve upon the rim, whilst the thread on the outer end
of the stem is designed for the attachment of the pump in the usual manner.
f is the valve proper which, as shewn detached in Figure 6, is formed with
the recess for receiving the plate and with the longitudinal hole h and the
transverse hole i.
jis the bar which is introduced into the hole and fits therein in such a
manner that under the pressure of the air pump the air will pass between the
said bar and the valve proper but that the pressure upon the exterior of the
said valve proper will force the same into tight contact with the said bar and so
prevent the passage of air in a backward direction. k is the shank which is
passed through the stem a and the hole of the valve proper and connected to
the bar in such a manner that when the said shank k is pressed the bar j will
be caused to stretch the valve proper and form a passage, as indicated at Figure 5,
through which the air can escape for deflating the tyre.
In the modification of my invention shewn in Figures 7 and 8 the valve
proper f, instead of being in one piece as hereinbefore described, is in two pieces
viz., an outer tubular portion f¹ and a flat portion f, the latter of which is
arranged between the plates and j whilst the former surrounds the said plate
and serves as a spring to press them into contact with the india rubber portion f².
The shank k is also screw threaded at its outer end and provided with a nut m,
the tightening up of which serves to draw the plate j towards the plate and so
compress the rubber to ensure a tight closing.
It will be understood that when my improved valve is fixed in position the
valve proper is entirely within the air bag.
I do not limit myself to the methods of connecting the valve proper to the stem
shewn in the drawings, as it may be held in other manners, for instance, the valve
proper may be in the form of a piece of india-rubber tubing held in a clip formed
upon the end of the stem.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:.
1. In a valve for pneumatic tyres, the combination of a tubular stem, an india-

page_text: rubber valve proper secured on or fixed to one end of the said stem and having a
longitudinal hole extending through it, a bar fitted into the said hole and a shank
passing through the stem into contact with the bar, all substantially as, and for
the purpose, described.
2. In a valve for pneumatic tyres, the combination of a valve stem, a plate
formed upon one end of the said valve stem, a valve proper provided with a recess
to fit over the said plate and with a longitudinal aperture through it and a trans-
verse aperture between the said longitudinal aperture and the passage through
the stem, a bar fitted into the said longitudinal passage and a rod or shank ex-
tending through the tubular stem and the transverse aperture into contact with
the bar, substantially as described.
3. The manufacture and use of valves for pneumatic tyres substantially as
herein before described and illustrated in Figures 1 to 6 and Figures 7 and 8 of
the accompanying drawing.
Dated the 10th day of August 1808
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.