Improvements in Connecting or Angle Sockets or Joints for Cycle Frames and the like.
Year: 1898

page_text: Date of Application, 25th Feb., 1898
Complete Specification Left. 25th Nov. 1898-Accented 7th Jan.
1899
ApprivatION, COLO
Complete Specification Left. 25th Nov. 1898-Accepted 7th Jan 1899
PROVISIONAL SPECIFICATION.
Improvements in Connecting or Angle Sockets or Joints for Cycle
Frames and the like.
We, EDWARD SCHÜRHOFF, Engineer, of 131, Schonebeckerstrasse, Magdeburg-
Buckan, BERTHOLD BERGEMANN, Gentleman, of 5, Benverstrasse, Berlin, S.O., and
ALBERT PROCHNOW, Factory Proprietor, Finsterwalde, all of the Empire of Ger-
many, do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved form of connecting bracket for the
tubular members of cycle or like frames, and its object is to provide a secure and
reliable connection.
At the present time the tubes of cycle frames are inserted in the angle brackets
and then strongly brazed together. It often happens that either the brazing is
insufficient allowing the tubes to become loose in their sockets, or that the metal
of the said tubes has been overheated, and either rendered too hard, or its nature
partially destroyed so that fractures often occur.
The present invention consists generally in forming the interior surface of the
socket with grooves and after insertion of the tube in its place expanding the metal
of the same into these grooves; or in so arranging spring rings upon the surface
of the tube that upon its insertion into the socket they spring into position in
the grooves in the said socket.
The accompanying sheet of drawings illustrate different methods of construct-
ing the new joint.
Figure 1 illustrates the connection by a spring.
Figure 2 the connection by expanding the tube.
Figure 3 a combination of the method used in the previous two figures.
Figures 4 and 5 are two similar views (one with the tube and one without the
tube) in which multiple grooves are used.
Figures 6 and 7 illustrate a connection with multiple expanding rings.
In Figure 1 a groove is turned in the socket c and the tube b to be connected
has a spring ring a placed upon it, the end of the said tube projecting beyond
this spring ring being of a diameter equal to the interior of the said ring. The
tube 6 is forced into place, and the ring d springs into the groove e¹ and a suitable
expanding mandril is introduced through the opening in the branch a of the
socket, and the end of the tube is expanded out to the diameter of the socket as
shown thus securing the tube firmly in situ, and making the required connection.
In Figure 2 the tube is introduced into the branch c of the socket and the
end of the tube is expanded into the groove f in a similar way by a mandril
through the opening in the limb a. A plug g is driven into position after the
tube has been expanded, and the connection is thus simple and firmly made.
Figure 3 illustrates a combination of the last two methods. A ring d springs
into position in a groove when the tube 6 is inserted, and this tube is expanded
through an opening into a groove f, and a plug 9 is then placed in position.
Figures 4 and 5 illustrate a multiple fastening of the tubes. Grooves b¹ 62 63
are formed in the tubes bb and corresponding projections a¹ a² a³ are formed in the
LD

page_text: respective limbs a a of the angle socket. The projections a¹ a² may be spring
rings of the type shown in Figure 1, or the tube may be got into position by
making these grooves and their corresponding projections continuous spirals, or
the tube itself may be a plain one and expanded into the grooves a¹ a² a³ after
the tube has been placed in situ. This method of expanding the tube into the
grooves of the limbs of the socket is clearly shown in Figures 6 and 7 where ¹³
are the grooves formed in the limbs. In this case the expanding can be done for
one limb through the opening and for the other limb through the opening a, and
Figure 6 illustrates the tube in position before expanding, and Figure 7 the said
tube after expanding.
It is to be understood that to prevent possible rotation of the tubes in the sockets
after connection has been made, the brazing or soldering may be also used in
addition, and the springs herein before described may be constructed of an easily
melted metal so that it can be used in place of soldering or brazing.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.
Improvements in Connecting or Angle Sockets or Joints for Cycle
Frames and the like.
We, EDWARD. SCHÜRHOFF, Engineer, of 131, Schenabeckerstrasse, Magdeburg-
Buckan, BERTHOLD BERGEMANN, Gentleman, of 5, Benverstrasse, Berlin, S.O., and
ALBERT PROCHNOW, Factory Proprietor, Finsterwalde, all of the Empire of Ger-
many, 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 an improved form of connecting bracket for the
tubular members of cycle or like frames, and its object is to provide a secure and
reliable connection.
At the present time the tubes of cycle frames are inserted in the angle brackets
and then strongly brazed together. It often happens that either the brazing is
insufficient allowing the tubes to become loose in their sockets, or that the metal
of the said tubes has been overheated, and either rendered too hard or its nature
partially destroyed so that fractures often occur.
In the present invention soldering is obviated and the tube which it is desired
to unite to the cycle frame is inserted in the connecting bracket and is provided
in the first instance with grooves or channels, and these grooves or channels are
not formed by removing metal but by pressing inwards the wall of the said tube.
In the connecting bracket corresponding grooves or channels are formed by
pressing outwards the metal of the bracket. The end of the tube is then intro-
duced a sufficient distance to make its grooves coincide with the grooves in the
connecting bracket.
It is evident that a connection' could be made by filling up the internal annulus
or annuli so formed by pouring in liquid metal such as solder from an orifice on
the exterior of the bracket or by introducing in the same way appliable wire to
form a ring. This method of connection however does not give good results as
the tube and bracket are too loosely connected and stiffness or rigidity is lacking.
The leading feature of this invention however, is to construct and insert a pro-
filed spring ring within the annulus or annuli so formed and in a manner more
particularly hereinafter described.

page_text: The accompanying sheet of drawings illustrate in vertical section on Figure 1
and Figure 2 a tube connected to a bracket by the improved construction, and
Figure 3 illustrates the end of the said tube before insertion within the bracket.
and
In this arrangement only one groove is formed in the corresponding pieces,
though it is evident any number may be employed. In the end of the tube a to
be inserted a groove such as c is formed and a profiled spring ring d is fitted
therein. A corresponding groove 6 is formed in the connecting bracket
the spring ring d is cut away in such a manner that it may be compressed to lie
flush with the outside diameter of the tube a as shown in Fig. 3. It is evident
that the tube a with its ring could in this condition be passed into the bracket e,
and as soon as the groove c came opposite the groove 6 that such ring would spring
outwards, and take the position shown in Figure 2, locking the tube a and e
against longitudinal movement away from each other.
The spring ring d may be cut out in many ways so that it can be sprung together
to lie flush with the outer surface of the tube a and permit the introduction of
the whole into the bracket, and it is evident that mechanism of many kinds may
be used temporarily to compress the spring while it is being introduced into the
bracket e. It is further preferred to make the groove e of sufficient depth to
easily receive the spring rings d, and it is evident that this spring ring itself can
be arranged of such a thickness that when the tube a has been inserted the thick-
ness of the ring will not only fill up the outer groove d but lap partially upon the
inner groove c, so that unless after the parts were in position the spring ring
were again compressed it would be impossible to pull these parts a and e asunder.
After this operation has been performed an apparatus like a tube expander is
introduced through the other opening of the bracket b and the wall of the groove c
is expanded outwards to take up the slight space shown in Figure 2, the joint
after this expanding having the formation shown in Figure 1. This finally
renders the joint longitudinally immovable and rigid and firm in all other direc-
tions. It is evident that this expanding could be performed through the end of
the tube or through a suitable perforation in the wall of the bracket.
It is to be clearly understood that more than one ring and its corresponding
grooves may be employed to form this improved joint and the rings may be of
any required breadth and thickness.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is :-
1. The improved means for connecting the angle sockets and tubes of cycle
frames or the like by rings lying in coincident grooves in the tube and bracket
so arranged that the ring is formed of a profiled collapsible spring and com-
pressed together within the groove in the tube so that it may be introduced into
the bracket and there spring out and thus lock the said tube and bracket together
and further expanding the inner tube by suitable mechanism to completely fill
up the space left by the expanding of the said spring ring.
2.-The improved joint for connecting angle sockets and tubes of cycle frames
and the like substantially as hereinbefore described with reference to Figures 1, 2,
and 3 of the accompanying drawings.
000