Improvements in Fixing Metallic Tubular Pieces upon each other, applicable to Cycle and other Framing or Tubing.
Year: 1896

page_text: Date of Application, 4th Dec., 1896-Accepted, 6th Feb., 1897
Improvements in Fixing Metallic Tubular Pieces upon each other,
applicable to Cycle and other Framing or Tubing.
We, GUSTAV HOYER Manufacturer and CARL HOYER and WALTER GLAHN
of the Firm of Hoyer and Glahu Manufacturers all of Schönebeck on the Elbe,.
Germany, 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 :-
This invention relates to improvements in the joining of tubing for bicycle-
frames and other frames and other tubing for the purpose of avoiding the usual
soldering and brazing and consequent weakening effect by heat caused by the
subsequent annealing and to do away with the cleaning and polishing at the places..
of soldering.
Fig. 1 is a side view of a bicycle frame to which the invention is applied.
Figs. 2 to 6 shew various modes of carrying out the improvements.
In Fig. 1 the tubular connecting pieces b for joining the members a are shewn
with indentations and swelled out places c, of part spherical form as shown to a
larger scale in Fig. 2. These places c may be varied in form. Thus in Figs. 3
and 4 they have an oblong form. Their relative positions may also be varied as
desired or required, and either be external (swelled or indented toward the outside).
or internal (swelled or indented towards the inside).
In Fig. 5 they are annular but opposite, in that the outer tube piece bhas-
outwardly swelled places, and the inner tube piece a has corresponding inwardly
swelled places, whereby hollow squares are formed which may be filled with tin or
other thin fluid metal or alloy run in through one or more small holes d.
In Fig. 6 is shewn a junction by means of part helical indents.
It should be noted that an expanding tool or mandril for producing the aforesaid
swellings is described in Jensen's Patent Specification No. 22807 of 1895.
In order to ensure perfect permanent cohesion between the parts joined and
thus to counteract the effect of the violent racking action which for instance bicycle
frames are exposed the parts to be joined should first be coated with tin or other
suitable metal or alloy and the outer tube piece should be heated by gas jets or
otherwise and kept hot while the swellings or indents are formed. By the
subsequent cooling the outer tube piece is firmly shrunk onto the inner tube piece,.
the tin serving to fill any minute crevices or uneven places between the surfaces
and ensuring perfect contact, but the inner tube piece should be of such a size
relatively to the outer heated tube piece as to require to be driven in by a light.
blow or pressure.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
The improved means for joining tubular pieces consisting in external or internal
indentations of the character described formed in both pieces substantially as
described and shewn.
Dated this Fourth day of December 1896
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agents.