Improvements in Apparatus and Process for Bending Bars of Iron of H or other Section.
Year: 1890

page_text: Date of Application, 8th Oct., 1890
Complete Specification Left, 8th July, 1891-Accepted, 8th Aug., 1891
PROVISIONAL SPECIFICATION.
Improvements in Apparatus and Process for Bending Bars of Iron
of H or other Section.
A communication to me from abroad by LOUIS PICARD, of St. Etienne, in the
Republic of France.
I, EDMUND EDWARDS, of the firm of Edwards and Co., Patent Agents and
Engineers, of 35, Southampton Buildings, Chancery Lane, in the County of
Middlesex, do hereby declare the nature of this invention to be as follows:-
This invention has for its object an improved process and apparatus for bending
bars of iron of H or other section to curves of any desired radius.
Supposing an H-shaped bar is to be bent it is arranged horizontally against the
edge of an iron guide of the required radius, one end of the bar being firmly or
otherwise secured to the end of the guide. The other or outer end of the bar rests
upon a guide or rail carried by suitable supports. A ring or collar is fitted upon
this outer end of the bar and a chain is attached to it which after passing round a
pulley is fixed to a rack driven by a toothed pinion so that when the latter is turned
round by a workman by means of a handle, the bar to be curved is drawn forcibly
toward the iron guide to which the other end is fixed.
This iron guide is composed of two bars of iron, the curved side of the upper
one of which gives the proper shape to the H-shaped bar which is being treated,
whilst the lower one is wider and supports the edge of the flange of the H-shaped
bar which is pressed against the curved guide.
The parts of the bar which is to be curved are successively heated to a red heat
by a portable furnace which runs upon wheels or rollers and through which the
outer flange of the H-shaped bar passes. The furnace consists of an iron casing,
with a firebrick lining at the back, and firebars at the bottom and at the top upon
which coke fires are made, the bar passing through doors at each end of the
furnace its central.web passing through a horizontal slit in the front of the furnace,
outside which the flange which is attached to the curved guide remains.
By the construction of the furnace described the part of the outer flange of the
bar which is to be bent is heated red hot, the heat gradually decreasing to the other
or inner flange which remains black though sufficiently hot to allow the bending to
take place without injury.
The parts of the bar are successively heated and bent, the furnace being moved
along it and air being brought to the latter through a flexible pipe from any suitable
blowing apparatus.
COMPLETE SPECIFICATION.
Improvements in Apparatus and Process for Bending Bars of Iron
of H or other Section.
A communication to me from LOUIS PICARD, of St. Etienne, in the Republic
of France.
I, EDMUND EDWARDS, of the firm of Edwards and Co., Patent Agents and
Engineers, of 35, Southampton Buildings, Chancery Lane, in the County of
Middlesex, do hereby declare the nature of this invention and in what manner
[Price 6d1

page_text: the same is to be performed, to be particularly described and ascertained in and
by the following statement and accompanying drawing, that is to say :-
This invention has for its object an improved process and apparatus for bending
bars of iron of H or other section to curves of any desired radius.
The accompanying drawing is in illustration of the invention,
Figure 1 being a plan of the entire apparatus,
Figure 2 a separate section of the bar and its supports through A, B, Figure 1,
and
Figure 3 a scetion of the portable furnace.
Supposing an H-shaped bar P is to be bent it is arranged horizontally against the
edge of an iron guide G of the required radius, one end of the bar being firmly
screwed or otherwise secured to the end of the guide. The other or outer end of
the bar rests upon a guide or rail I carried by suitable supports.
A ring or collar d is fitted upon this outer end of the bar and a chain e is attached
to it which after passing round a pulley p is fixed to a rack t driven by a toothed
pinion D so that when the latter is turned round by a workman by means of a
handle M, the chain e is drawn in the direction of the arrow and the bar P to be
curved is drawn forcibly toward the iron guide G to which the other end is fixed,
by a screw V.
This iron guide is composed of two bars of iron f,f', (as shown in section in
Figure 2) the curved side of the upper one of which gives the proper shape to
the H-shaped bar which is being treated, whilst the lower one is wider and
supports the edge of the flange of the H-shaped bar which is pressed against the
curved guide G.
The parts of the bar which is to be curved are successively heated to a red heat
by a portable furnace F (Figures 1 and 3) which runs upon wheels or rollers
and through which the outer flange of the H-shaped bar passes. The furnace
consists of an iron casing with a firebrick lining at the back and firebars at the
bottom, and at the top upon which coke fires are made, the bar passing through
doors or openings at each end of the furnace, its central web passing through a
'horizontal slit in the front of the furnace, outside which the flange which is
attached to the curved guide remains.
of
By the construction of the furnace described the part of the outer flange
the bar which is to be bent is heated red hot, the flame passing in the direction
of the arrows, the heat gradually decreasing to the other or inner flange which
remains black though sufficiently hot to allow the bending to take place without
injury.
The parts of the bar are successively heated and bent the furnace being moved
along it and air being brought to the latter through a flexible pipe T from any
suitable blowing apparatus S.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The use of a moveable furnace for heating bars which are to be bent.
2. The method of constructing the moveable furnace, substantially as described
and shewn.
3. The combination of the guides G, H, chain e rack and pinion t, D, and fixing
screw V, constructed and operating substantially as and for the purpose described
and illustrated.
EDWARDS & Co.,
35, Southampton Buildings, London, Agents for the Applicant.