Improvements in Apparatus for Flanging Boiler Flues, Fronts, and the like.
Year: 1891

page_text: Date of Application, 26th Sept., 1891
Complete Specification Left, 27th June, 1892-Accepted, 6th Aug., 1892
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Flanging Boiler Flues, Fronts, and
the like.
I, JOHN CROW of 5 Afton Crescent Paisley Road West, Glasgow, Engineer,
do hereby declare the nature of this invention to be as follows :-
This invention relates to apparatus for flanging the ends of cylindrical boiler
Hues, the edges of flat or domed boiler fronts or plates and the like, and it has for
its object mainly to lessen the friction, and consequently the power consumed in the
flanging operation.
The improved apparatus as adapted for flanging boiler flues comprises the usual
sole or bed piece fitted with a chuck by means of which the flue shell is supported
and rotated, and a vertical standard or column having a bracket arm or saddle by
which are carried the rollers employed to bend over the end or edges of the shell
in flanging it. In lieu of the usual single grooved roller used to lay over the
edges and by the use of which great friction is occasioned owing to the higher
surface velocity of the flanged edge than of the cylindrical shell I employ two
rollers or sets of rollers placed at right angles to each other. The one roller is
loosely fitted on a horizontal shaft carried in bearings on the standard and in a slide
on the bracket arm, and the other roller is fitted on a vertical stud or spindle
carried on the slide beyond the first roller. The horizontal shaft is screwed and
passes through a fixed screwed sleeve or nut and it is driven by gearing to traverse
the slide with the rollers horizontally to and from the work.
The rollers are so shaped that as they are brought towards the work the end of
the horizontal roller, which is domed or made of conoidal form, gradually turns
and lays over the edge at right angles or other angle to the shell when a cylindrical
or conical portion of the roller bears upon the flattened edge or flange whilst the
vertical roller is at the same time brought up into rolling contact with the inner
surface of the flue shell, a curved fillet formed near the meeting point of the rollers
serving to give the requisite curved or finished contour at the line of junction of
the cylindrical shell and flange.
At the point where the rollers operate on the rotating flue a beveled roller carried
on a bracket on the vertical standard is fitted to bear on the outer sides of the
cylindrical shell and flange and support the shell against the pressure of the rollers
as they are traversed in contact with the work and other supporting rollers are or
may be provided to bear on the shell and maintain it in its proper position.
For flanging boiler fronts or domed or flat plates which are secured horizontally
on the rotating chuck the bracket carrying the rollers is fitted to slide vertically in
guides on the vertical standard and the axis of the domed or conoidal roller which
lays over the edge to form the flange is vertical whilst the other roller which bears
on the flat or domed portion of the boiler front or plate is horizontal. In this
case the beveled roller which supports the work against the pressure of the flanging
rollers is carried on the bracket arm or saddle overhanging the work so as to bear
on the inside of the flange whilst the flanging rollers act on the outer sides.
Dated this Twenty-fifth day of September 1891.
;

page_text: .
COMPLETE SPECIFICATION.
Improvements in Apparatus for Flanging Boiler Flues, Fronts, and
the like.
I, JOHN CROW of 5 Afton Crescent, Paisley Road West, Glasgow, Engineer,
'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 apparatus for flanging the ends of cylindrical boiler
flues, the edges of flat or domed boiler fronts or plates and the like and it has for
its object mainly to lessen the friction and consequently the power consumed in the
flanging operation.
In the accompanying drawings which illustrate the invention Figure 1 is a side
elevation and Figure a plan showing a modification of the improved apparatus
as adapted for flanging or turning over the ends of boiler flues; Figures 3 and 4
are similar views of the same machine as adapted for widening out the flanged end
of a flue and Figures and 6 are.similar views showing the machine as adapted for
flanging boiler fronts or end plates.
The improved apparatus as adapted for flanging boiler flues and as represented
at Figures 1 and 2 comprises the usual sole or bed piece A fitted with a chuck B
by means of which the flue shell C is supported and rotated and a vertical
standard or column D having a vertically adjustable bracket arm or saddle E
by which are carried the rollers employed to bend over the end or edges o of
the shell in flanging it. In lieu of the usual single grooved roller used to lay
over the edges and by the use of which great friction is occasioned owing to
the higher surface velocity of the flanged edge c than of the cylindrical shell C
I employ two rollers or sets of rollers F and G placed at right angles to each
other.
The one roller F is loosely fitted on a horizontal shaft carried in bearings on
the standard D and in a slide H on the bracket arm E and the other roller G
is fitted on a vertical stud or spindle. carried in bearings on the slide H
beyond the first roller F. The horizontal shaft is screwed and passes through a
fixed screwed sleeve or nut and it is driven by gearing 1, J from a shaft K
provided with belt pulleys L L to traverse the slide H with the rollers F, G
horizontally to and from the work. The rollers F, G are so shaped that as they
are brought towards the work the end of the horizontal roller F which is domed or
made of conoidal form, gradually turns and lays over the edge o at right angles or
other augle to the shell C when a cylindrical or conical portion of the roller bears
upon the flattened edge or flange whilst the vertical roller G is at the same time
brought up into rolling contact with the inner surface of the flue shell C, a curved
: fillet formed at or near the meeting point of the rollers F, G serving to give the
requisite curved or finislied contour at the line of junction of the cylindrical shell
and flange.
At the point where the rollers F, G operate on the rotating flue C a bevelled
roller M carried on a bracket N adjustably secured on the vertical standard D is
fitted to bear on the outer sides of the cylindrical shell C and flange and support
the shell against the pressure of the rollers F, G as they are traversed in contact
with the work; and other supporting rollers O, O are or may be provided to bear
on the shell and maintain it in its proper position.
N
In the machine represented at Figures 3 and 4 the horizontal roller F is removed
whilst the machine is employed only for widening out the end of the shell Cas
shown at c but the horizontal roller F may be employed to partially effect the
widening or laying over of the edge and the vertical roller G brought into rolling
contact with the shell to finish the widening operation.
For flanging boiler fronts or domed or flat plates which are secured horizontally

page_text: on the rotating chuck B as represented in Figures 5 and 6 the bracket E carrying.
the rollers is fitted to slide vertically in guides on the vertical standard D and
the axis of the domed or conoidal roller F which lays over the edge e' to form the
flange on the boiler end or front C' is vertical whilst the other toller G which bears.
on the flat or domed portion of the boiler front or plate is horizontal.
In this case the bevelled roller M which supports the work against the pressure
of the flanging rollers F, G is carried on the part of the bracket arm or saddle E
overhanging the work so as to bear on the inside of the flange c whilst the flanging.
rollers F, G act on the outer sides. In other respects the machine resembles those.
described with reference to Figures 1 and 2. To facilitate the vertical adjustment.
of the bracket arm E on the column or standard D it is counterbalanced by a.
weight P carried by a chain Plattached to it and passing over a pulley P on the
column and a rack Q is formed on the bracket in gear with a pinion R by means of
which the sliding bracket is raised or lowered by means of hand wheel S and
intermediate gearing T.
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 combination of parts constituting the improved apparatus for flanging
boiler flues fronts and the like substantially as hereinbefore described with
reference to the accompanying drawings.
2. In apparatus for flanging boiler flues and the like the arrangement or com-
bination of horizontal and vertical rollers for laying over the flanged end or edge
of the shell or plate substantially as described.
Dated this Twenty-fifth day of June 1892.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.