Improved Rim for Pneumatic Cycle Wheels.
Year: 1893

page_text: Date of Application, 22nd Mar., 1893-Accepted, 20th May, 1893
COMPLETE SPECIFICATION.
Improved Rim for Pneumatic Cycle Wheels.
HJALMAR AAE of Holckenhus 33 Copenhagen in the Kingdom of Denmark,
Studiosus Juris, 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 present invention has for its object a wheel rim for pneumatic cycle wheels
in which the pneumatic tyre may be taken out of the rim and replaced again without
the use of either dissolving or cementing mediums.
In the annexed drawings:
Fig. 1 is a transverse section of the rim of the wheel.
Fig. 2 is a perspective view of a part of the rim.
Fig. 3. is a detail.
The rim is made of two separate parts a and b of which the first named part a is
made to carry the spokes c. The two parts a and b of the rim are constructed with
Hanges bent upwards in such a manner as to form recesses or grooves which harbour
or retain closed rings t made of iron wire and which are inserted in the outer
covering d of the pneumatic tyre, at the same time the rings t are pressed strongly
into the grooves by the pressure of the air tubes and thus form a watertight joint
with the rim.
The part 6 of the rim is provided at its lower side with oval rivets e by means of
which it can be fixed to the other second part a of the rim which part a is provided
with corresponding holes f having short slots f¹. The heads of the rivets e are able
to pass through the holes while the stems of the said rivets enter the slots 1.
In order to enable the loose part of the rim to be attached to the other part a
and fixed thereto in the before mentioned manner, it is made up of several parts
instead of forming a continuous ring which allows it to bent out straight far enough
to enable it to be turned over. This special construction is designed to allow the
pneumatic tyre itself to be easily loosened and taken off, for repairing for instance,
which, were the rims made all in one, would present great difficulties.
If the covering d has to be taken off in order to get at the air tubes, pressure is
brought to bear on the loose part of the rim, the result of which is that the rivet
heads e leave the holes so as to allow that part of the rim to be taken off. One of
the two wirest is next disengaged and the tube covering can then be detached. In
order to replace the covering it is pushed over the middle of the rim and after
putting the loose part of the rim in its proper place the rivet heads e are passed
through the holes f and the stems e¹ of the rivets are pressed into the slots f³.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
b
1. An improved rim for pneumatic cycle wheels constructed of a fixed part a and
a loose part which latter can be easily removed and replaced for the purpose of
facilitating the mounting and dismounting of the loose part of the rim in order to
allow the pneumatic tyre to be easily removed or placed in position.
2. In connection with the rim for cycle wheels of the construction claimed in the
preceding claim the use of rivets e in conjunction with the loose part of the rim

page_text: and corresponding holes f with slots in the fixed part a of the rim forming the
means of connecting the loose to the fixed part substantially as described.
Dated this 22nd day of March 1893.
E. P. ALEXANDER & SON, Fels. Chartd. Inst. P.A.,
19, Southampton Buildings, London, W.C., Agents.