Improvements in Apparatus for Drilling and Rivetting the Tube Flanges and Flue Plates of Galloway Boilers.
Year: 1896

page_text: Date of Application, 12th Dec., 1896
Complete Specification Left, 15th Jan.. 1897-Accepte 1, 20th Feb., 1897
Improvements in Apparatus for Drilling and Rivetting the Tube
Flanges and Flue Plates of Galloway Boilers.
We, GALLOWAYS LIMITED, and JOHN HENRY BECKWITH, all of Knott Mill
Iron Works, Manchester in the County of Lancaster, Engineers, do hereby declare
the nature of this invention to be as follows:-
In the Specification No. 13362 of 1894 is described a particular form of
Galloway boiler tubes which are made taper with a conical flange at each end, the
smaller flange fitting inside the plate on the one side of the flue, the larger flange
fitting outside the plate on the other side of the flue, the flue plates on both sides
being undulated so that the conical flanges fit on them.
The present invention relates to apparatus for drilling the rivet holes through
the flanges and flue plates, and for rivetting the tube flanges and flue plates
together. For this purpose we place each tube in position in the flue and apply at
each end of it a crown connecting the two crowns by a central tie bolt so as to
clamp the flanges firmly to the flue plates. Within the flue itself between each
tube and the next is placed a stretching bar having right and left screws and a
nut, by which the sides of the flue are strained apart. On a prolongation of the
tie bolt we mount an oblique frame carrying a drill the axis of which is perpendicular
to the face of the conical flange. This frame is capable of being turned round
step by step as determined by divisions on the crown. The drill is driven by a
flexible shaft or other gear connecting it to a suitable motor. When one hole is
drilled, the drill frame is turned one division round the central bolt and another
hole is drilled, and this is repeated until all the holes are drilled around the
flange.
When the holes for the flange at one end of the tube are drilled, the central bolt
is inverted and the drill frame being applied at the other end of the tube the holes
for the other flange are drilled in a similar manner. After the holes are drilled,
the drill frame is removed from the bolt and an oblique frame carrying a percussive
rivetter, worked by compressed air or steam, is fitted on the bolt. By this tool a
number of blows are struck on each rivet, but, in order to ensure a good form of
rivet head fitting close to the plate or flange at its edges, it is preferred to
interpose between the striker and the rivet a bolster having concentric spherical
surfaces, which, being held by a wire or other handle can be turned into various
positions as the blows are struck.
Dated this 12th day of December 1896.
ABEL & IMRAY,.
Agents for the Applicants.

page_text: Improvements in Apparatus for Drilling and Rivetting the Tube
Flanges and Flue Plates of Galloway Boilers.
We, GALLOWAYS LIMITED, and JOHN HENRY BECKWITH all of Knott Mill
Iron Works, Manchester, in the County of Lancaster, Engineers, 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:-
In the Specification No. 13,362 of 1894 is described a particular form of
Galloway boiler tubes which are made taper with a conical flange at each end, the
smaller flange fitting inside the plate on the one side of the flue, the larger flange
fitting outside the plate on the other side of the flue, the flue plates on both sides
being undulated so that the conical flanges fit on them.
The present invention relates to apparatus for drilling the rivet holes through
the flanges and flue plates, and for rivetting the tube flanges and flue plates together.
For this purpose we employ apparatus which we shall describe referring to the
accompanying drawings.
Fig. 1 is a section of flue with three tubes, the right hand tube having applied
to it a drill shewn in section and partly in elevation, the middle tubes having the
drill shewn in cross section, and the left hand tube having applied to it a rivetter.
Fig. 2 is a side elevation of the drill,
Fig. 3 is a plan on the line 3-3 of Fig. 1;
Fig. 4 is a sectional plan on the line 4-4 of Fig. 1, and
Fig. 5 shews a modification of the drill having also a hand feed.
We place each tube T in position in the flue and apply at each end of it a
crown CC connecting the two crowns by a central tie bolt B so as to clamp the
flanges firmly to the flue plates F. Within the flue itself between each tube and
the next is placed a stretching bar S having right and left screws and a nut, by
which the sides of the flue are strained apart. On a prolongation of the bolt B
we mount an oblique frame D carrying a drill the axis of which is perpendicular
to the face of the conical flange of the tube T.
The frame D is capable of being turned round the top of the bolt B as an axis,
being turned step by step as determined, a catch lever d engaging divisions c
between teeth on the crown C. The drill is driven by a flexible shaft or by a band
on pulley d' or other gear connecting it to a suitable motor.
When one hole is drilled, the drill frame D is turned one division round the
central bolt and another hole is drilled, and this is repeated until all the holes are
drilled around the flange. The drill may have self acting feed as shewn in
Figs. and 2 or hand feed as shewn in Fig. 5.
When the holes for the flange at one end of the tube are drilled, the central
bolt B is inverted and the drill frame D being applied at the other end of the
tube the holes for the other flange are drilled in a similar manner.
After the holes are drilled, the drill frame is removed from the bolt and an
oblique frame R carrying a percussive rivetter, worked by compresse.l air or steam,
is fitted on the bolt B. By this tool a number of blows are struck on each rivet,
but, in order to ensure a good form of rivet head fitting close to the plate or
flauge at its edges, it is preferred to interpose between the strikers and the rivet
a bolster having concentric spherical surfaces, which, being held by a wire to or
other handle can be turned into various positions as the blows are struck.
During the rivetting the head of the rivet is held up by a bar H inside the flue
provided with a tightening screw, and held in position by rings h h embracing the

page_text: tubes T. When a rivet is finished the rivetting tool R is turned partly round
the bolt B, and the bar H having been somewhat loosened is turned partly round
the tube T and tightened up against the head of another rivet which is operated on
in like manner.
The bar H instead of being set up by a screw may have a cylinder and piston
subject to the pressure of steam or compressed air.
When the rivetting of one flange of the tube T is completed, the bolt B is
inverted and a rivetting tool of suitable obliquity is applied for operating on the
rivets of the other flange.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim in respect of apparatus for drilling and rivetting tube flanges and flue
plates of the kind described in the Specification No. 13,362 of 1894, is :-
1. The combination of a stretching bar within the flue, a tie bolt securing
crowns at the ends of a tube, a drill obliquely mounted on the end of the bolt, and
a catch lever on the drill frame engaging divisions between teeth on the crown,
substantially as described.
2. The combination of stretching bar within the flue tie bolt securing crowns at
the ends of a tube, a rivetter obliquely mounted on the end of the bolt and a
holding up bar within the flue, substantially as described.
Dated this 15th day of January 1897
ABEL & IMRAY,
Agents for the Applicants.