Improvements in and connected with Pneumatic Tyres for Cycles and similar Vehicles.
Year: 1899

page_text: Date of Application, 11th Apr., 1899-Accepted, 13th May, 1899
COMPLETE SPECIFICATION.
Improvements in and connected with Pneumatic Tyres for Cycles and
similar Vehicles.
I, GUSTAV KROHN, of Nr. 32, Bethesda Strasse, Hamburg-Borgfelde, in the
German Empire, Merchant, do hereby declare the nature of this invention, in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:
The present invention relates to improvements in and connected with pneumatic
yres for cycles and similar vehicles, the special purpose of the invention being
to construct the tyre in such a manner that a puncture of the air tube will not
render the tyre as a whole useless in view of the special means provided for
protecting the outer tyre from being damaged. The ordinary pneumatic tyres
do not enable the machine to be ridden after the tyre has been punctured and
deflated, as, in view of the sharp edges of the rim the outer tyre will be cut, so
as to be entirely useless in a comparatively short time.
Moreover the machine suffers through being ridden with a deflated tyre, the
rim having necessarily to come into contact with the track. To obviate these
drawbacks has long been the desire of many proposed constructions of tyres, but
the present invention attains said purpose in a very satisfactory manner, the tyre
acting, so to say, as a solid tyre on the tyre becoming deflated, thus a tyre con-
structed according to the present invention combines the advantages of a pneumatic
tyre with those of a solid tyre.
I will now proceed to more fully describe my invention, reference being had
to the accompanying drawings, in which
Fig. 1 shows a vertical section through the complete tyre when inflated.
Fig. 2 is a vertical section through the complete tyre when deflated.
Fig. 3 is a perspective view of my improved tyre, showing simultaneously a
modification of the invention.
The outer tyre d made of india rubber in the usual manner is provided at the
This thickened
inside opposite the tread f with an annular thickened portion e.
portion must be of a sufficiently large size to act in co-junction with the tread
portion as a tyre without bringing the rim into contact with the road surface,
when being ridden in a deflated condition. Thus the tyre acts as a solid tyre,
thereby enabling the use of the machine in the event of a puncture happening
without causing the outer tyre to be damaged or injured by the rim, as mentioned
before. A tyre in this condition is shown in Fig. 2.
The tyre comprises the following parts:-The rim a, suitably made of metal,
the edges are turned inwards at an acute angle to secure the tyre therein. The
extreme sides are curved outwards to prevent presenting a sharp edge to the
tyre to bear on. The two angled side parts of the rim a are marked b and c in
the drawings. d is the outer tyre with the tread f, fitting with its cornered
edges into the rim a, so as to occupy the angled side parts b and c of same.
e is the curved annular thickened portion of the outer tyre f. The inner air
tube g fits into the outer tyre f in the usual manner.

page_text: After
A modification of the invention is shown in Fig. 3, which consists in detachably
arranging one of the side parts c of the rim a; the purpose of this arrangement
being to accelerate and facilitate the mounting of the tyre on the rim.
removing said side part c the outer tyre is easily fitted with its edges h h¹ into
the angled side parts b and c of the rim a, whereupon the side part c is replaced
and secured in position. Bolts, screws or the like may be employed for securing
the side part of the rim a in its locking position.
The thickened portion e of the outer tyre f may, if desired, be arranged so as
to be opposite the rim i.e. immediately inside the tread of the tyre; but the arrange-
ment previously described will be the more preferable one.
Having now 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) An outer tyre containing an air tube having the edges constructed in such
a manner that an annular inwardly projecting thickened portion is formed, which
on the pneumatic tyre collapsing may be used as an ordinary solid tyre; the tread
of the tyre being always at a higher elevation as the side edges of the rim, while
these side edges are curved to prevent injuring the tyre, substantially as described
and shown.
2) An outer tyre containing an air tube, the whole constructed, arranged and
operating substantially as described with reference to the accompanying drawings.
1000
B. REICHHOLD,
International Patent Office, 24, Luisen Strasse, Berlin, N.W., Germany,
Agent for the Applicant.