Improvements in Inflating Valves for Pneumatic Tyres.
Year: 1896

page_text: DIONA DI
Improvements in Inflating Valves for Pneumatic Tyres.
I, ADOLF DAVIDS, of 121, Carolinenstrasse, Hanover, in the German Empire,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to a non-return or check valve for use with velocipedes
having pneumatic tyres which differs from such valves as hitherto made in that
only a slight expenditure of force is necessary to raise or lift it whilst on the other
hand it remains perfectly air tight on its seat which is usually not the case with
valves as generally employed.
The defects of valves, as hitherto constructed, are avoided in the valve forming
the subject of this invention by a particular arrangement of the conical valve or
plug end of the valve seat which permits a very slight movement of the valve but
at the same time ensures a perfectly tight closure.
The valve or plug is pressed firmly on its seat by a device hereinafter described
so that it cannot leave the said seat even during severe shocks to the wheel of the
cycle.
In carrying out my invention I provide a valve casing which is connected with
the air tube of the tyre in the ordinary manner. Into a conical recessed portion of
this casing a conical and easily released valve seat with an india-rubber jacket is
pressed by means of an external nut.
In the valve seat there is arranged a conical valve or plug, the lower reduced end
of which is formed with a screw-thread whilst the cone proper is continued above
as a cylinder. This cylindrical portion is provided with a slot in which a
projecting pin or the like, arranged in the casing engages and by means of which
pin or the like the movement of the valve is limited and the lateral movement of
the same prevented.
The conical, and also to a certain extent the cylindrical portion of the valve,
are covered with an india-rubber jacket for the purpose of ensuring a tighter joint
between valve and valve seat.
The lower reduced portion or spindle of the valve is enclosed in a nut or cap the
neck of which is provided or formed with an internal screw-thread which engages
with the screw-thread on the spindle or reduced portion of the valve.
By screwing up the nut or cap the conical portion of the valve is pressed with its
india-rubber jacket into the upper opening of the valve seat so that the valve is
tightly closed.
To inflate the tyre of the cycle the nut or cap is unscrewed and removed to give
the valve free play and to enable the air pump to be connected to a nipple on the
end of the valve seat. On the forward stroke of the pump piston compressed air
is forced into the seat, raises the valve from its seat and passes between it and the
seat through the casing into the air tube of the tyre. On the return stroke of
the pump piston the valve and its rubber covering are pressed against the upper
opening of the valve seat by the pressure of the air so that the return or escape
of the said air is prevented.

page_text: When the air tube is sufficiently inflated the pump is unscrewed and the nut or
cap is again screwed on to the valve.
By this means the valve is pressed tightly on the seat so that an escape of air
from the tyre is impossible as the valve cannot be raised from its; seat even by
shocks or vibrations.
To deflate the tube it is only necessary to unscrew the nut or cap and
to raise the valve from its seat by pressing on the reduced end or spindle of
the valve by means of a projection on the cap or by other suitable means.
Dated the 9th day of November 1896.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
I, ADOLF DAVIDS, of 121, Carolinenstrasse, Hanover, in the German Empire,
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:-
This invention relates to a non-return or check valve for use with velocipedes
having pneumatic tyres which differs from such valves as hitherto made in that.
only a slignt expenditure of force is necessary to raise or lift it whilst on the other
hand it remains perfectly air tight on its seat which is usually not the case with
valves as generally employed.
The defects of valves, as hitherto constructed, are avoided in the valve forming
the subject of this invention by a particular arrangement of the conical valve or
plug and of the valve seat which permits a very slight movement of the valve but
at the same time ensures a perfectly tight closure.
The valve or plug is pressed firmly on its seat by a device hereinafter.described
so that it cannot leave the said seat even during severe shocks to the wheel of the
cycle.
To enable my invention to be fully understood I will describe it by reference to
the accompanying drawing, in which:
Figure 1 is a longitudinal section through a valve made according to my inven
tion, the said valve being shewn closed:
Figure 2 is a similar view shewing the valve open, and
Figure 3 is a view of a detail.
G is the valve casing which is connected with the air tube L of the tyre in the
ordinary manner. Into a conical recessed portion of this casing a conical and
easily released valve-seat S with an india-rubber jacket gl is pressed by means of
an external nut U.
In the valve-seat S there is arranged a valve or plug K (shewn separately in
Figure 3) consisting of a conical portion ', of a lower reduced end k which is
formed with a screw-thread and of an upper cylindrical portion. This
cylindrical portion is provided with a slot in which a projecting pin s or the
like, arranged in the casing G'engages and by means of which pin or the like the
movement of the valve is limited and the lateral movement of the same prevented.
The conical, and also to a certain extent the cylindrical portion of the valve, is
covered with an india-rubber jacket for the purpose of ensuring a tighter joint
between valve and valve seat.
The lower reduced portion or spindle k of the valve K is enclosed in a nut or
cap D the neck d of which is provided or formed with an internal screw-thread

page_text: which engages with the screw-thread on the spindle or reduced portion of the
valve K.
By screwing up the nut or cap D the conical portion kl of the valve K is pressed
with its india-rubber jacket into the upper opening of the valve-seat S so that
the valve K is tightly/closed as shewn in Figure 1.
To inflate the tyre of the cycle the nut or cap is unscrewed and removed (as shewn
in Figure 2) to give the valve free play and to enable the air pump to be connected
to a nipple S' on the end of the valve-seat S. On the forward stroke of the pump
piston compressed air is forced into the seat S, raises the valve K from its seat
and passes between It and the seat through the casing G into the air-tube of the
tyre On the return stroke of the pump piston the valve K and its rubber
covering are pressed against the upper opening of the valve seat S by the pressure
of the air so that the return or escape of the said air is prevented.
When the air-tube is sufficiently inflated the pump is unscrewed and the nut or
cap D is again screwed on to the spindle of the valve K.
By this means the conical portion of the valve is pressed tightly on the
seat S so that an escape of air from the tyre is impossible as the valve cannot be
raised from its seat even by shocks or vibrations.
To deflate the tube it is only necessary to unscrew the nut or cap D and to raise
the valve from its seat by pressing on the reduced end or spindle k of the valve by
means of the projections on the cap D or by other suitable means.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is :-
1. A valve for the inflation of pneumatic tyres consisting of a valve-seat rigidly
held in a casing by means of a nut and provided with an elastic jacket
and of a conical valve proper also provided with an elastic jacket, the said
conical valve being reduced at its lower end to form a spindle formed with a screw
thread to receive a cap for holding the conical valve tightly against its seat,
substantially as, and, for the purpose, herein before described.
2. In a valve of the kind described in the preceding claiming clause the
employment of a projection or pin s adapted to engage in a slot in the conical valve,
substantially as, and for the purpose, hereinbefore described.
3. The manufacture and use of the improved valve for inflating pneumatic
wheel-tyres herein before described and illustrated in the accompanying drawing.
Dated the 9th day of August 1807
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.