Improvements in and relating to Drilling Machines for Boiler Furnaces and the like.
Year: 1898

page_text: Improvements in and relating to Drilling Machines for Boiler
Furnaces and the like.
I, JOHN POLLOCK, of 4, Levenford Terrace, in the Town and County of Dum-
barton, Engineer, do hereby declare the nature of my invention to be as
follows:-
This invention has reference to improvements in and relating to drilling
machines for boring rivet holes in boiler furnaces or flues and the like.
According to my improvements the machine is made to revolve round the inside
of the furnace shell on a tripod frame, which is rigidly secured by means of
radial adjustable screw threaded rods. The spindle carrying drilling tool would
be driven by bevel and spur gearing either operated by hand or by motive power,
and the forward feed would be given by a worm and screw or like gear.
11
141 TI
1000
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
Improvements in and relating to Drilling Machines for Boiler
Furnaces and the like.
I, JOHN POLLOCK, of 4, Levenford Terrace, in the Town and County of Dum-
barton, 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 has reference to improvements in and relating to drilling
machines for boring rivet holes in boiler furnaces or flues and the like.
According to my improvements the machine is made to revolve round the inside
of the furnace shell on a tripod or multiped frame, which is rigidly secured by
means of radial adjustable screw threaded rods. The spindle carrying drilling
tool would be driven by bevel and spur gearing either operated by hand or by
motive power, and the forward feed would be given by a worm and screw or
like gear.
And in order that my said invention and the manner of carrying same into
practice may be properly understood, I have hereunto appended a sheet of ex-
planatory drawings in which the same reference letters are used to indicate like
parts in all the figures where shown. Figure 1 is a sectional elevation and

page_text: Figure 2
a corresponding sectional plan view of my improved machine.
Figure 3 is an end view showing the machine mounted on the multiped frame
and secured by adjustable screw threaded rods within a furnace shell. While
Figure 4 is a detached plan view showing the multiped frame and method of
mounting the machine, on same.
Referring to these drawings,
A multiped frame A is used having a series of screw threaded pockets A¹ for
radial adjustable screw threaded rods a to work into, and be tightened up by
inserting a turning tool in the part a¹, the outer ends of the rods a bearing
against the inner surface of the furnace shell Z. Sleeves would preferably be
fitted round the rods a.
The boss head of tripod A is formed with a central pin A2, for the hollow
arm B of the framing B of machine to be mounted over and turn round freely
on within the furnace shell 1.
A
The framing B has a central cylinder or boss B2 through which works the
spindle C on which the drilling tool would be mounted at its outer end C¹.
mitre or bevel wheel D would be keyed or secured on the spindle C and be driven
by a corresponding wheel I mounted on a spindle D2 carried in a hollow boss B³
of the framing B; and this spindle D2 would be rotated by any ordinary gear
from a primary spindle, or by a hand operated crank.
The forward feed would be given to the drilling tool as follows:-
A screw threaded spindle e would be mounted within the hollow spindle C, and
an annular cap el would be jointed to these, and be also free to slide within the
hollow part 6 of the central cylinder or boss 132. An extension or connection c
would be taken from the spindle c and be fitted with a thrust collar and on the
part would be mounted a worm wheel E, and a hand turning wheel E' may
also be mounted on same, the whole being adjustably secured by a jam nut_c³.
By turning the spindle extension the drill carrying spindle will get a gradu-
ated forward feed, as well as a revolving motion from the bevel wheels D¹, D.
The worm wheel E may be actuated by a worm c mounted on a spindle e¹, on
which is secured a spur wheel, having gear connections through the spur
wheels d, d, with the wheel secured to the neck of the bevel wheel D¹.
The tool can in practice be set to its work without stopping the running of the
gear wheels actuated by a flexible shaft on the spindle D2 by unscrewing jam
nut to loosen the wheel E and feeding spindle C forward by hand wheel E¹.
The frame B carrying the machine would be turned on the arm A² of multiped
frame A, by turning the handles B34, so as to set the spindle C carrying the
drilling tool in line with the markings for the holes to be drilled in the furnace
shell Z.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
First. A machine for drilling holes in boiler furnaces and the like mounted on
a multiped frame and secured by adjustable rods substantially as herein
described.
Second. The arrangement in combination, of the parts of a machine and
adjustable rods for drilling holes in boiler furnaces and the like substantially as
herein described in reference to and shown in the accompanying drawings.
Dated the 13th day of Anril 1899
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.