An Improved Method of Brazing Joints of Bicycle Frames and other Tubular Frames or Articles and Tool for Preparing the same.
Year: 1898

page_text: An Improved Method of Brazing Joints of Bicycle Frames and other
Tubular Frames or Articles and Tool for Preparing the same.
We, HENRY GREENHALGII and JOHN THOMAS HOWCROFT, both of 58, Man-
chester Road, Hyde, in the County of Chester, Cycle Manufacturers and General
Machinists, and JESSE GREENHALGH, of 40, Seymour Street, Denton, in the County
of Lancaster, retired Mill Furnisher, do hereby declare the nature of this inven-
tion to be as follows:-
―:
This invention relates chiefly to the brazing of the joints of cycle frames but
it is equally applicable to the brazing of any tubular part in a socket or bracket.
Our invention consists in corrugating the end of the tube before inserting it
into the socket and inserting into the groove or grooves thus formed the brazing
matter, which may be in the form of wire, ribbon, or other suitable form.
The tube thus prepared is inserted into the socket or bracket, and, after braz-
ing, the joint will be found to be very strong, and perfectly clean and free from
superfluous brazing matter which has at present to be filed away, this filing
occasionally being too severe when carelessly done and weakening the frame.
To corrugate the tube we use a special tool consisting of a lever or other equiv-
alent device which can be readily turned as hereafter described and which is
provided with two or more rollers adjustable with regard to each other.
The rollers are made with corresponding convex and concave rings so that
when part of the end of the tube has been inserted between them (one roller
being inside the tube) and they are tightened together, a depression is made in
the tube; the lever or its equivalent is then caused to rotate around the tube
and a groove or corrugation is made in its surface.
If each roller is made with more than one concave or convex ring more than
one groove can be made in the end of the tube.
Dated the 21st day of July 1808
GEO. DAVIES & SON,
Agents for the Applicants,
4, St. Ann's Square, Manchester.
An Improved Method of Brazing Joints of Bicycle Frames and other
Tubular Frames or Articles and Tool for Preparing the same.
We, HENRY GREENHALGH and JOHN THOMAS HOWCROFT, both of 58, Man-
chester Road, Hyde, in the County of Chester, Cycle Manufacturers and General
Duis Q27

page_text: Machinists, and JESSE GREENHALGH, of 40, Seymour Street, Denton, in the County
of Lancaster, retired Mill Furnisher, do hereby declare the nature of this inven-
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 chiefly to the brazing of the joints of cycle frames, but
it is equally applicable to the brazing of any tubular part in a socket or bracket,
and to the brazing of two tubes together.
The nature of our said invention and the manner in which the same is to be
performed or carried into practical effect will be readily understood on reference
to the annexed sheet of drawings and the following explanation thereof..
Fig. 1 on the drawings represents a bracket or socket forming (say) part of a
bicycle frame. with a tube brazed thereto according to our invention. Fig. 2 is
a sectional view of the two parts detached, and Fig. 3 a section of the joint when
completed; a being the bracket or socket and 6 the tube.
Figs. 4, 5 and 6 are elevation, section and plan views respectively of the im-
proved tool which we employ for preparing the tube for brazing as hereinafter
described.
Our invention consists principally in making a corrugation or indentation (or
more than one) all round the end of the tube b (as shown at 6x Fig. 2) before
inserting it into the socket a, and in inserting into the groove (or grooves) thus
formed the spelter or other brazing matter or material which may be in the form
of a ring of wire or ribbon c or of other suitable form so that it will lie snugly
in circular groove or recess b× without projecting beyond the outer circumference
of the tube b.
The end of the tube thus prepared is then coated with borax or other suitable
flux and inserted into the socket or bracket a (as shown at Fig. 3) and after
brazing by the application of heat outside the bracket, the joint will be found
to be very strong, and perfectly clean and free from superfluous brazing matter
which has at present to be filed away, this filing_being_occasionally too severe
when carelessly done, and weakening the frame. It is also necessary under the
usual process to apply the heat directly to the tube to melt the spelter just out-
side the socket which has a tendency to burn the tube and weaken it at this
point; whereas according to our invention the heat is applied to the outside of the
socket or bracket which is much stronger and thicker than the tube, and another
advantage is that the spelter or brazing material is introduced inside the joint
before it is melted, the tube being at the same time an absolute fit which could
not be done under the old process.
In order to form the circumferential groove or corrugation 6x round the end
of the tube we use a special tool (see Figs. 4, 5 and 6), consisting of a lever d or
other equivalent device which can be readily turned as hereafter described, and
which is provided with two or more rollers which are adjustable with regard to
each other.
In the form of tool for this purpose shown on the drawings there are three
rollers, e, f, and g all capable of revolving the two former being fixed (as regards
position) and carried by a bracket dx forming the head of the lever d, and the
third one being carried by a slide h and being adjustable to and from the
rollers e, f, by means of a screw i.
The rollers are made with corresponding convex and concave rings so that
when part of the end of the tube b has been inserted between them (the roller
being inside the tube) and they are tightened together by turning the screw i
a depression is made in the tube; the lever d (or its equivalent) is then caused
to rotate round the tube, which is held in a vice, and thus a circumferential
groove or corrugation (as at bx) is made all round its surface near to the end.
It will be evident that if each roller is made with more than one concave or
convex ring more than one circumferential groove can be made at one time on
the tube,

page_text: It will also be evident that two tubes of such differing diameters that the end
of one just fits inside the other can readily be joined together by our improved
method.
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:-
First: The improved method of brazing joints of tubular bicycle and other
frames consisting in forming a circumferential indentation or groove at or near the
end of the tube, laying a ring of spelter or other brazing materials in such groove,
then inserting the end of the tube thus prepared into the socket, bracket, or other
tube to which it is to be brazed, and then applying the heat to the outside of the
latter so as to melt the spelter already in the joint, and
Secondly. We claim the construction and use of a special tool for this purpose
consisting of two or more rollers having corresponding convex rings and concave
recesses, such rollers being provided with means for adjustment with regard to
each other and for giving pressure and adapted to a lever or other equivalent means
for rotating the same round the tube whilst the pressure is being applied, all sub-
stantially as herein before described and illustrated by the drawings annexed.
Dated this 30th day of March 1899.
GEO. DAVIES & SON,
Agents for the Applicants,
4, St. Ann's Square, Manchester.