Improvements in Valves for Pneumatic Tyres.
Year: 1899

page_text: Date of Application, 12th Oct., 1899-Accepted, 23rd Dec., 1899
Improvements in Valves for Pneumatic Tyres.
I, BERNHARD GUTHERT, of Vahrenwalderstrasse, Hanover, in the Empire of
Germany, Mechanician, 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 invention has reference to air valves for cycle tyres and the like, and
relates, first, to the connection between the valve and the air chamber, and
secondly, to the means for closing the valve cone and exactly guiding it within
the casing and for permitting the passage of air through the valve into the air
chamber of a tyre or the like.
According to one form of the first part of my invention, the connection of
the said parts is effected by a portion of the tyre being drawn over and secured
around a. grooved neck or nozzle formed at the inner end of the valve casing.
Figure 1 shows, in transverse section, the connection of the tyre e, with the
valve casing or body a by such means whilst Figure 2 is a plan of the inner
or necked end of the valve body. This connection is effected by forming an
annular depression d around the bottom of the neck c, with a projecting head
or overhanging collar contiguous to it, and into which depression or groove, a
portion of the elastic material of the tyre is drawn and there firmly held by
means of a split or solid spring collar f. being pushed over the head. This
necked end is either attached to the tyre e, before it is closed and the opening
for the ingress of air made in the stretched material or the air-opening may
The collar f may be
be made in the tyre before the connection is effected.
of any construction and applied around the neck in any desired way, whilst
the tyre is stretched over the said neck c in such a manner that the air-opening
lies over the bore or hole in the neck which leads into the interior of the valve.
A simplified modification of this arrangement is shewn in Figures 3 and 4.
In this form the sprung-on locking collar f is replaced by a cap f, in the
base of which there is an opening fo, adapted to fit onto a small projecting
nipple, which either has its bore coincident with the air passage in the neck
as shewn in Figure 3 or it may itself extend a distance into the said bore as
shown in Figure 4. In both cases the bottom edge of the cap is thickened or
narrowed at the mouth end to form the means for gathering the elastic material
of the tyre into the groove in the necked inner end of the valve body.
Figure 5 shews the connection between the valve body or casing and the tyre
made by means of an internally fitted and grooved nozzle c, onto which the
elastic material surrounding the opening in the tyre is stretched and there
held or locked with an air-tight joint, by forcing the clamping nozzle and
stretched on tyre material together through a contracted aperture k, leading
into the body of the valve. The nozzle is introduced into the tyre either before
it is closed or by means of the air opening made in it. This connection as
described above is firm and tight and is adequate for ordinary usage. It is,
however, easy to protect the connection against unnecessary forcible treatment
by the following arrangement, which is shewn in Figures 1, 2, 3, 4 and 5.

page_text: The casing has flanges b, over which a protecting cover y of woven fabric such
as for example drill or the like or thin web or sheet metal or other material
is placed. This cover g may be attached either to the tyre alone or to both
the tyre and flanges b and is so connected, that it is impossible either to turn
the connection end of the valve casing within the tyre or to pull it out by
using force. If, for example, the protective cover is made from woven fabric,
it is so cemented to the tyre that the surfaces of cementation extend round the
edge of the flanges b, which are thereby completely shut in. The connection
of the protective cover g with the flange 6 can be effected by means of cement,
stitches, rivets, screws and the like.
By means of the above described new connection of tyre and valve all the
well-known disadvantages with the ordinary valve. fastening are. obviated.
To avoid the other known disadvantages of ordinary valve systems propose
to construct a valve in the manner shown in longitudinal section in Figure 3
and in transverse section upon the dotted line in Figure 6. In this construc-
tion the valve is provided internally with a sliding plug m, having a series of
concentric ridges m°, on its lower surface, adapted to, be closed onto and
embedded into a disc or washer n, made of leather or, other suitable material
the drawing down of the plug to close the valve, or the raising of the
same
off i
its leather seating to admit of the escape of air being effected by means of
a. screw t, carried by the rotatable closure dust cáp s, taking into a screwed
hole in the plug. India rubber is scarcely suitable for, the disc n, as in case
of adhesion,, a portion of the closing or sealing washer might be torn away
when the plug is raised. The said plug m is so constructed and arranged as
to be incapable of rotation with the valve cases, as its ridges m, must fit into
the grooves produced by them in the sealing washer n, in order to establish' an
air-tight closure. If the plug m, were provided, as is usual, with surfaces
for. the passage of air, on account of the small size of the said plug, the guiding
surfaces still remaining round, would soon wear away and the plug would then
fit loosely in the casing.
34
'On this account, to admit of the passage of air into the tyre e, either the
plug m, or the valve casing a, or both of them is or are provided either with
helical grooves such as "o and 2, in Figure 4, or with straight grooves such
as o, and 1, shown in the transverse and vertical sections of the modified
arrangement represented in Figures 8 and 9.
To prevent the rotation of the plugs, its inner end m², is either facetted at m³
to work against a corresponding flat a', of the valve body, as shown in Figures 3
and 6, or the said inner end may be nearly circular section and take into a
round excentric hole in the casing as shown in the sectional view Figure 7.
In both cases the air passes through a passage,², between the plug. and the
casing into the tyre.
The sealing washer is held down onto the open end of the valve body by
the screwed-on cap, and the sealing is made more positive by the drawing of
the ridged end of the plug against its underside. It is not absolutely necessary
for the particular connection of tyre and valve case as described and illustrated
to be invariably combined with the improved method of closing and guiding
of the valve, as each of these improvements may be used by itself in valves
of other constructions.
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:-
First: A valve for cycle tyres and the like, thereby characterized that the
casing of the valve has at its inner end a necked nozzle or grooved extension (c)
onto which the substance of the tyre is stretched and there fastened or locked
by a split or other collar (f) or by a cap f with a contracted mouth, which is

page_text: sprung over or applied to the said nozzle and gathers the tyre material into the
groove thereof, substantially as described and set forth in Figures 1, 3 and 4.
Secondly: The modification of the valve and tyre connection referred to in
Claim 1, the valve casing has a contracted aperture or outlet, through which a
loose nozzle or necked fitting with the tyre material stretched onto it, is forced,
substantially as described and set forth in Figure 5.
Thirdly: The herein-described means for securing the connection of tyre
and casing (referred to in the preceding claims) against rough treatment, cha-
racterized by a protective cover (g) made of woven fabric, thin sheet or woven
metal or the like being placed over the flanges of the valve casing and being
firmly connected either with the tyre (e) alone, or the flanges (6) alone or with
both, a loosening of the cover or a turning of the case in the tyre being
rendered impossible, substantially as set forth.
Fourthly-An air valve for cycle tyres and the like, provided inter-
nally with a sliding plug or closure (m), one end of which is formed with one
or more concentric ridges (m°) adapted to be embedded or drawn into a leather
or other sealing washer, the said plug being provided with means for preserv-
ing its position in the casing and air passages being formed in the walls of
the plug or the casing or both, substantially as herein described and set forth.
Dated this 11th day of October 1899.
BERNHARD GÖTHERT.
By Henry Skerrett,
24, Temple Row, Birmingham, Agent for Applicant.