Improved Means for Preventing the Bending, Buckling, Deformation, or Breaking of Tubes and Tubular Bodies.
Year: 1896

page_text: Date of Application, 2nd Mar., 1836-Accepted, 11th Apr., 1896
COMPLETE SPECIFICATION.
Improved Means for Preventing the Bending, Buckling, Deformation,
or Breaking of Tubes and Tubular Bodies.
I, AUGUST KIRSCHBAUM of 229 Kaiserstrasse, Solengen, in the Kingdom of
Prussia and Empire of Germany, 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 and by the following statement :-
In utensils and other articles or parts of the same which are made of tubes or
tubular sectious for the purpose of lightness, such for instance as cycle frames, tool
Jandles, camp bedsteads, carriage axles, swing bars, flagstaff's &c., it often happens
that under a little extra or unusual strain, a sharp bending, buckling, permanent
deformation or breaking is produced in such tubular bodies which thereby renders
them unavailable for further use.
This occurs especially in cycles which are made of very thin tubes and such
bending, buckling or breaking has frequently caused serious accidents.
This disadvantage is obviated according to the present invention by filling the
interior of the tubes or tubular parts with cork. The resistance of cork is quite
sufficient to stiffen the thin tubular walls so far as to prevent any local bending,
buckling, deformation or breaking thereof.
It may be mentioned that the cork filling is preferably in the form of flat discs
of about the same area as the interior free space or bore of the tube and placed at
suitable distances apart, the spaces between which are filled with disintegrated cork
which may be in the form of cork dust or shavings more or less fine and which may,
if desired, be mixed with a suitable binding medium, such for instance as india
rubber, cellulose or a solution of caseine.
In order to increase the effect, the cork filling may be compressed within the
tubes or tubular bodies under the influence of more or less pressure.
The tubes thus treated may be of any form or section, such for instance, as
round, square, oval, ribbed or fluted, and they may be straight, bent or otherwise
shaped. In manufacturing bent tubes it may in some cases be advantageous to
bend them into shape after they have been filled with cork.
My invention is illustrated in the accompanying drawings in which
Figures 1 and 2 represent a straight cylindrical tube A, with the cork filling a
therein, Fig. 1 being partly an elevation and partly a longitudinal section and
Fig. 2 a cross section thereof;
Figures 3, 4 and 5 show tubes or tubular bodies A of various forms or sections
provided with a cork filling a according to the present invention, Fig. 3 being oval,
Fig. 4 square and Fig. 5 fluted.
Having now particularly described and ascertained the nature of my said inven-
ion and in what manuer the same is to be performed I declare that what I
claim is :-
1. A metal tube or tubular body having a cork filling substantially as herein
hown and described and for the purpose stated.
2. In metal tubes or tubular bodies the filling of the same with cork, to prevent
he beading, buckling, deformation or breaking thereof substantially as herein set
orth.

page_text: 3. In metal tubes or tubular bodies the filling of the same with disintegrated
cork combined with a suitable binding agent substantially as herein set forth.
Dated March 2nd 1896.
HARRIS & MILLS,
23 Southampton Buildings, London, W.C., Agents.