Improvements in the Method of Making Tapered Tubes, suitable for Use in the Production of Cycle-forks, and also suitable for other Purposes.
Year: 1895

page_text: Date of Application, 14th. Nov., 1895.
Complete Specification Left, 15th May, 1896-Accepted, 4th July, 1896
PROVISIONAL SPECIFICATION..
Improvements in the Method of Making Tapered Tubes, suitable
for Use in the Production of Cycle-forks, and also suitable for
other Purposes.
I EDWARD WARWICK Mechanical Engineer of Trinity House, Trinity Road,
Handsworth in the County of Warwick do, hereby declare the nature of this
invention to be as follows:-
This invention consists in the method of producing tapered tubes as hereinafter
described.
•
I provide a piece of parallel tubing of the required length to form into a
tapered tube. I next provide a shaping-mandril which would be of circular or
other desired transverse section in accordance with the section of tapered' tube
required, the shaping-mandril would be tooled out so as to form two or more
V shaped gutters such gutter-sinkings being at the deepest at the small end of
mandril and thence tapering to the large end terminating on the outer periphery
of the large end of said mandril.
next provide a pair of press tools each of such dies would present one or more
tapered V shaped projections (by preference one projection only).
A piece of ordinary parallel tubing would be slipped over the tapered mandril,
the mandril with tube on would next be placed in one half or portion of the die
in a suitable position to pass over the projections of die or to receive such
projections.
The action of the closing of the dies by movement of die-press, would force
the extra loose part of parallel tube situated at small end of mandril into
the V. shaped grooves of the said mandril and thus produce a partly formed
tapered tube..
The partly formed tapered tube would next be taken off the mandril and
squeezed or compressed together by suitable mechanical means so as to close the
two outer upper edges of the V shaped groove formed lengthways on the partly
made tapered tube, thereby forming strengthening ribs within the tapered tube,
the outer surface being a complete usable tapered' tube, of greater strength than an
ordinary tube.
By providing shaping-mandrils of round, oval, or polygonal transverse section,
tapered tubes can be produced of any desired section under this my invention.
To convert a tapered tube made in the manner hereinbefore described into a cycle
fork the internally-ribbed tapered tube would be compressed into, the desired flat
oval section known to be suitable for such forks, and afterwards bent out of the
longitudinal into the required curved configuration.
By a second modification of my invention I take a suitable piece of metal
as in the ordinary method of tube drawing and from such piece of metal draw
out a tapered tube over, a tapered mandril guttered in the manner described in
first modification, tapered tubes so partly formed would next be closed at the
upper edges of V shaped gutters as hereinbefore described in relation to first
modification.
Dated this 12th day of November 1895.
ALFRED WILLIAM TURNER,
Cobden Buildings, Corporation Street, Birmingham,
Agent for the Applicant.

page_text: COMI LEIE FECIFICATION.
Improvements in the Method of Making Tapered Tubes, suitable
for Use in the Production of Cycle-forks, and also suitable for
other Purposes.
I, EDWARD WARWICK Mechanical Engineer of Trinity House, Trinity Road
Handsworth in the County of Warwick 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 consists in the method of making and producing tapered tube
Buitable for use in the production of cycle-forks and also suitable for other purposes
as hereinafter described.
I will now proceed to describe with reference to the accompanying drawings the
manner in which my improved tapered tubes are produced.
Figure 1 represents a side view of a tapered cycle-fork-tube produced by the
ordinary method.
Figure 2 represents a front view of Figure 1.
Figure 3 represents an end view or transverse section of an ordinary round tube
as utilized in the make up of my improved tapered tubes.
Figure 4 represents the length of round tube as shewn at Figure 3, compressed
at the large end ready to receive the guttering tool.
Figure 5 represents the length of round' tube as shewn at Figure 3 compressed
at the small end ready to receive the guttering tool.
Figure 6 represents the large end Figure 4 compressed by means of guttering
tools.
Figure 7 represents the small end Figure 5 compressed by means of guttering
tools.
Figure 8 represents the large end Figure 6 closed together.
Figure 9 represents the small end Figure 7 closed together.
Figure 10 represents a round tube converted into the gutter shape ou one side
only.
Figure 11 represents the narrow end of a round tube converted into the gutter
shape on one side only.
Figure 12 represents the large end Figure 10 closed together.
Figure 13 represents the small end Figure 11 closed together.
Figure 14 represents a longitudinal half size section of Figures 8 and 9 on the
lines A. B and C. D, the tapered tube being bent from the straight into the curved
fork-shape.
In carrying out my invention I provide a tube of the transverse circular section
as shewn at Figure 3 of the required length to bend into the fork-side shewn at
Figure 14.
1
next compress the length of tubing at the wide end to form the flats a, and at
the narrow end to form the flats b, thus producing a continuous flat tapered
surface on each side of the length of tubing, the tube so flattened would next be
guttered by means of suitable tools, the large end flats a being guttered as shewn
at e Figure 6, the small end of tube at b Figure 5 being guttered as shewn at d
Figure 7, so producing continuous tapered gutters, one on each side of the tube ;
the guttered tube would next be compressed so as to close the shallow gutters c
close together as shewn at Figure 8, and so as to close the deep gutters d of narrow
end, as shewn at Figure 9; producing continuous internal tapered strengthening
ribs e.
My improved tapered tube so produced is next bent into the form shewn at
Figure 14 and thereby converted into a cycle-fork-side.

page_text: I prefer in some cases to form the tapered gutter on one side only of the
circular tube, in such cases I provide a circular tube as shewn in transverse section
at Figure 3 and compress one side only into the flattened shape shewn at a Figure 4
and at 6 Figure 5, such tube is next compressed into the form shewn at Figures 10
and 11, the shallow gutter being situated at the large end of tube, and the deep
gutter g producing the small end of tube, the tube as guttered on one side only
would next be closed together, the shallow gutter of large end when closed together
producing the internal rib as shewn at Figure 12, the narrow end g when closed
together producing the wide end of rib as shewn at j.
The production of tapered tubes in the manner herein before described is specially
applicable for use in the make up of cycle-forks, nevertheless my invention is also
applicable for the production of tapered tubes of any desired size and length and
of any desired transverse section; instead of providing two flate a Figure 4
and Figure 5, I can provide three or any desired number of flattened sides
as a means of converting parallel tubes of large diameter into tapered tubes,
and it will be readily understood that the internal strengthening ribs will in
each case materially strengthen the tapered tube, be such tube made from a
one inch diametered parallel tube with one internal tapered rib, or from a four
inch parallel tube converted into a tapered tube with four or more tapered
internal ribs.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is performed I,declare that what I
claim is:-
1st. The making of tapered tube out of a parallel tube by flattening guttering
and compressing one, two or more side-faces of the parallel tube so as to press
inwards the material taken from narrowed part and therefrom produce one, two, or
more tapered internal strengthening-ribs, as illustrated and described.
2nd. The making of a cycle-fork from an internally ribbed tapered tube as
described in relation to Figure 14.
Dated this 14th day of June 1896.
ALFRED WILLIAM TURNER,
Cobden Buildings, Corporation Street, Birmingham,
Agent for the Applicant.