Improvements in connecting the Tubes of Cycle-frames with their Junction Pieces.
Year: 1897

page_text: Date of Application, 10th Mar., 1897
Complete Specification Left, 10th Dec., 1897-Accepted, 10th Mar., 1898,
PROVISIONAL SPECIFICATION.
Improvements in connecting the Tubes of Cycle-frames with their
Junction Pieces.
I, SALOMON FRANK, of No. 2 Bleichstrasse, Frankfort-on-the-Maine, in the Empire
of Germany, Mechanical Engineer, do hereby declare the nature of this inven-
tion to be as follows:-
-
This invention relates to connecting the tubes of cycle-frames with their
junction-pieces.
"
Where it is desired that two parts shall slide or 'telescope" into each other;
if the outer diameter of the inner part be equal to the inner diameter of the outer
part, the parts cannot be inserted into, and passed over, each other respectively in
the ordinary manner; but it is only necessary to cover the contact-surfaces of
both parts with a coating of tallow or like fatty matter, in order to admit of the
insertion of one piece into the other, provided it be performed very rapidly. Great
speed, however, is absolutely necessary, for, should it be endeavoured to insert the
one piece into the other slowly, or should an interruption, occur in the movement,
the two parts will at once bind to one another so firmly, that neither can be
moved backward or forward.
By acting in the manner described, the tubes of cycle-frames can be connected
very firmly to their junction pieces.
The outer diameter of the inner part may be somewhat larger than the inner
diameter of the outer part, into which it is to be inserted; but then the outer
part should be slightly heated, while the inner piece is left cold. In this case also
great rapidity in the process of insertion is indispensable, as, during the process
of insertion the exchange of heat between the two parts takes place very quickly,
and is only retarded to a very limited extent by the intervening fatty matter.
The parts thus joined adhere to each other with great firmness. To prevent
any chance of displacement of the parts by rotary movement longitudinal grooves
and projections may be provided in the respective contact surfaces of the pieces to
be connected.
Improvements in connecting the Tubes of Cycle-frames with their
Junction Pieces.
I, SALOMON FRANK, of No. 2, Bleichstrasse, Frankfort-on-the-Maine, in the Empire
of Germany, Mechanical Engineer, do hereby declare the nature of this inven-
071

page_text: tion, 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 connecting the tubes of cycle-frames with their
junction pieces.
Where it is desired that two parts shall slide or "telescope" into each other; 5
if the outer diameter of the inner part be equal to the inner diameter of the outer
part, the parts cannot be inserted into, and passed over, each other respectively in
the ordinary manner; but it is only necessary to cover the contact-surfaces of
both parts with a coating of tallow or like fatty matter, in order to admit of the
insertion of one piece into the other, provided it be performed very rapidly. Great 1
speed, however, is absolutely necessary, for, should it be endeavoured to insert the
one piece into the other slowly, or should an interruption occur in the movement,
the two parts will at once bind to one another su firmly, that neither can be
moved backward or forward.
By acting in the manner described, the tubes of cycle-frames can be connected]
very firmly to their junction-pieces.
The outer diameter of the inner part may, be somewhat larger than the inner
diameter of the outer part, into which it is to be inserted; but then the outer
part should be slightly heated, while the inner piece is left cold.
1
Guzing
tility in the pit.
tion indispensable, as,
ination the exchange of heat between the two parties
place very quekly, and is only retarded to a very limited extent by the intervening
fatty matter.
The parts thus joined adhere to each other with great firmness. To prevent any
chance of displacement of the parts by rotary movement, longitudinal grooves and
projections may be provided in the respective contact surfaces of the pieces to be
connected.
I will describe with reference to the accompanying drawings the manner
in which this invention may be performed.
Referring first to Figures 1, 2 and 3, each of which represents a longitudinal
and cross section. After the parts to be joined have been inserted the one into the
other as herein before described a hollow head a is inserted into the joint thus
formed, which head is provided with radially displaceable balls b. 'The said balis
may be retained in position by pins in slots or in any suitable way which will
allow of their necessary movement.
A conical mandrel C situated inside the hollow head a is driven in and this forces
the balls outwards so as to bulge out those portions, which are opposite them.
If then the head a be moved forward with the mandrel, longitudinal grooves
will be formed in place of the semi-spherical projections, as is represented in
Figure 2, where (as also in Figure 3) both parts are presumed to be sufficiently,
pliable to allow of their being forced outwards by the balls.
In Figure 1 the exterior tube is provided with holes e, in which the hemi-
spherical projections of the inner tube become imbedded. If the outer part be too
rigid to admit of being forced out by the balls these holes may be elongated so as
to allow of the inner part being forced longitudinally into them by the longitudinal
movement of the head a and mandrel b.
Figure 4 represents another method. In this case before the one part is driven
into the other a mandrel d is inserted into the outer part, into which the tube is to
be slidden. The head of the said mandrel is provided with longitudinal ribs f
projecting so as to approach somewhat closely the inner wall of the part in which
the mandrel is inserted. If the inner part be, then driven in, forcibly and rapidly,
as herein before described, it passes along over the ribs f, and in so doing, is bulged
out by the said ribs, and in its turn, bulges out the opposed portions of the outer part
The mandrel is subsequently withdrawn.
Fig. 5 represents the bottom bracket of a bicycle frame with the tubular stays
fixed in sockets of the said bracket by providing circular holes e in the said sockets
and bulging the metal of the stays into the said holes in the manner hereinbefor

page_text: lescribed. Fig. 6 is a view similar to Fig. 5 the sockets of the bottom bracket
having elongated holes e and the stays having elongated protuberances forced
thereinto as herein before described. Figs. 7 and 8 are views similar Figs. 5
and 6 respectively, shewing the bottom brackets provided with concavo pro-
tuberances formed in the sockets into which the metal of the stays is forced in
the manner herein before described so as to fix the stays in the said sockets.
In this manner the respective parts are so joined together as not to admit of
their relative displacement.
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:-
1. The connection of the tubes of cycle-frames with their junction pieces by
rapidly inserting the tube end into a junction piece having an internal diameter
equal to the external diameter of the tube, the contact surfaces of either the
junction piece or tube or both, being coated with tallow, or fatty matter previously
to the rapid insertion of the tube in the junction piece as hereinbefore explained.
2. The connection of the tubes of cycle frames with their junction pieces, by
rapidly inserting the tube end into a junction piece having an internal diameter
somewhat less than the outer diameter of the tube, the junction piece being at a
higher temperature than the tube and either or both of the contact surfaces being
greased before the rapid insertion of the tube in the junction piece as hereinbefore
explained.
3. In connecting cycle-frame tubes to junction pieces as claimed by the preced-
ing claiming clauses preventing relative rotary displacement of the joined parts
by forming longitudinal grooves in the contact-surfaces as hereinbefore explained.
4. In connecting cycle frame tubes to junction pieces as claimed by the preced-
ing first and second claiming clauses, preventing displacement of the joined parts by
forming grooves or recesses therein by a hollow head provided with radially dis-
placeable balls forced outwards by a conical mandrel driven into the said hollow
head so, as to form projections with or without then elongating these projections
by longitudinal movement of the head and mandril as herein before explained.
5. In connecting cycle-frame tubes to junction pieces as claimed by the preced-
ing first and second claiming clauses, inserting in the junction piece, a mandrel
provided with longitudinal ribs and then driving in forcibly and rapidly the tube
so that the said ribs bulge out the connected parts as herein before explained.
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