Improved Valve for Pneumatic Tyres, Air Cushions, and the like.
Year: 1897

page_text: Date of Application, 10th Dec., 1897-Accepted, 5th, Nov., 1898
COMPLETE SPECIFICATION.
Improved Valve for Pneumatic Tyres, Air Cushions, and the like.
I, GEORG MÜLLER, of No. 30, Wilhelmstrasse Gmünd, Suabia, in the German
Empire, Manufacturer, 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
in and by the following statement:-
My invention relates to an improved valve for pneumatic tyres, also applicable to
air cushions and the like. This valve consists essentially of a cylindrical piece
screwed into a cover, and is distinguished by the arrangement that in the lower part
of the said cover there is arranged a valve plug, provided with an interchangeable
washer and removably connected with the valve rod, in such a manner that the said
plug is not revolved by the turning up or down of the covering piece but is moved
upwards or downwards in the vertical direction. The upper part of the covering
piece is provided with a slot, in which a lid forming a key engages in such a manner
that the screwing in and out of the cover may be effected without the aid of any
special tool.
Referring to the accompanying drawing,
Figure 1 shows the valve double the ordinary size,
Figure 2 shows a vertical section of the same.
Figure 3 a section on the line X-X of Figure 2.
Figure 4 a detail of Figure 2, when the cover is made use of as a screw-driver.
Fig. 5 shows the valve during the forcing-in of air.
The
The outer covering piece a is attached to the rim of the wheel. Into this is
screwed the piece b which forms at its lower part a seat for the valve plug c.
said plug c is raised from its seat or lowered upon the same by means of the said
piece b. For this purpose the valve rod c¹ is provided with a top c² which slides in
a slot 6 of the holder b. When the said piece b is screwed down, its lower part acts
upon the valve plug c and presses the same firmly upon its seat, whilst the said plug
its raised from its seat by the screwing of the apparatus in the opposite direction,
because the projection 68 carries with it the piece c² of the valve rod. It is obvious
from the drawing that the valve rod c¹ slides freely in the cover, thus obtaining
the advantage, that the valve plug is not revolved together with the cover when the
same is screwed in or out, as is the case in other constructions, but is moved up or
down in a straight line. Consequently the wear of the valve plug by friction-is
avoided, so that it hardly wears at all. In order however to provide for such wear
the valve plug is provided with a groove in which is inserted a washer c³ of leather,
cardboard or the like.
By means of this arrangement the rider can himself without difficulty replace
the same.
The faculty of removing the valve for the purpose of cleansing the
same or of replacing the said washer is obtained by the arrangement that the
bar c¹ is adjustably connected at c with the valve plug.
The said bar c¹ has at its upper end a slot whereby it can be screwed in or out.
Also the upper part of the cover b possesses a slot 62, in which the projection d¹ of
the cover d formed as a screw key can engage, by means of which said cover b can
ID 837

page_text: be removed from its envelope a, or screwed into the same again without the aid of
special tools.
The above described combination has consequently the advantage that the whole
of the parts are easily and quickly taken apart or interchanged, without requiring
for this purpose the aid of a skilled workman."
The valve is operated in the following manner :--
There is roon between b and c¹ for the passage of the air into the valve.
Consequently when air is to be pumped in, the connecting pipe of the air pump is
secured to a above and pressure applied. At each stroke of the pump piston the
rod c¹ and consequently also the valve body will be a little pressed down so that the
air can flow past the rod c¹ and past the edge of the valve c which is somewhat
raised from its lowermost bearing, and thus can arrive into the tyre or cushion.
When the pump piston effects the return stroke the back pressure of the air
immediately lifts the valve against the upper seating, so that the valve closes
automatically.
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 :-
An improved valve for pneumatic tyres, air cushions and the like, consisting
essentially of a cylinder 6 screwed into an outer cover a, and having at its lower
part a valve plug c provided with an interchangeable washer c³, and adjustably
connected with the valve bar c¹, so arranged that upon the screwing in or out of the
said cylinder b the valve plug is not revolved with it, but is moved up or down in a
straight line; the upper of the said cylinder b being provided with a slot in which
the projecting key of the cover d engages, in such a manner that the screwing in or
out of the said cylinder b can be effected without the aid of a special tool,
substantially as described.
Dated the 10th day of December 1907
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant.