IMPROVEMENTS IN MECHANISM AND ARRANGEMENTS FOR DRILLING BOILER SHELLS FLUES AND OTHER ARTICLES "
Year: 1883

page_text: LETTERS PATENT to Severin Borland of the City of Manchester, in the
County of Lancaster, Engineer for an Invention of "IMPROVEMENTS IN
MECHANISM AND ARRANGEMENTS FOR DRILLING BOILER SHELLS FLUES AND
OTHER ARTICLES
"
PROVISIONAL SPECIFICATION left by the said Severin Borland at the
Office of the Commissioners of Patents on the 20th April 1883.
SEVERIN BORLAND of the City of Manchester in the County of Lancaster
Engineer, "IMPROVEMENTS IN MECHANISM AND ARRANGEMENTS FOR DRILLING
BOILER SHELLS, FLUES AND OTHER ARTICLES,"
{
"
My invention consists in improved arrangements and constructions of mechanism
designed more especially for drilling rivet holes in metal cylinders for steam boilers,
but which may be used for other drilling purposes.
Two drill spindles are arranged end to end in the same axial line to rotate in
the same direction, but reversely in relation to each other, and the bearings for
these drill spindles are carried on two pairs of disc plates as hereinafter described
and these pairs of disc plates, are connected by bars or bolts passing through tubes
that keep the disc plates at their proper distance apart-Between each pair of
disc plates there is a grooved pulley the boss of which has its bearings in the
disc plates and is connected by a key and key groove with its drill spindle so as to
rotate it while permitting the spindle to be slided to and fro to push out or draw
in the drill.
Between the bosses of the two grooved pulleys and around the drill spindles
there is a tube or boss upon which there is a wheel which forms both a "hand"
and "worm wheel," for giving the to and fro motion to the drill spindle.
In the interior of the boss of the hand and worm wheel, there is a right hand
screw thread in one part of the boss for one drill spindle, and a left handed screw
thread in the other part of the boss, for the other drill spindle.
There are also corresponding screw tubes in the right and left handed screwed
boss in the interior of which screw tubes each spindle can rotate, but the spindle

page_text: in each case is connected to its screw tube so as to move endways with it and each
screw tube is prevented from rotating with its spindle by a key and key groove.
The worm and hand wheel is arranged to gear with a worm on a shaft when the
feed of the drills is to be made self-acting, and this worm shaft is in bearings in
an excentric tubular part having bearings on the cross bars or parts connecting the
disc plates so that by turning the tubular excentric by a handle the worm is
brought in and out of gear with the worm and hand wheel when required.
The worm shaft has a pulley with a series of grooves in it to be rotated by an
endless rope or band from another similar pulley bereinafter referred to.
The drill spindles are arranged either to receive the drills, or chucks to hold the
drills, and both drill spindles are rotated in the same direction, so that the same
drill will do for either spindle.-
In a position directly over the mechanism above described and at any
convenient distance, there is a tubular shaft, having three grooved pulleys upon it,
namely, a middle pulley fast on the tubular shaft and two other pulleys at equal
distance from the middle grooved pulley, both free to rotate loose on the tubular
shaft;
but one of them is arranged to be brought into gear with the boss of the
middle pulley fast on the tubular shaft, by a clutch actuated by a pin sliding in
the tubular shaft.
Motion is conveyed from the driving power by an endless rope passing over
suitable guide pulleys, and then to the middle grooved pulley on the tubular shaft
above referred to, which is thus suspended in the loop of the rope, and another
endless rope is made to pass over the two grooved pulleys loose on the tubular
shaft and under the two grooved pulleys for rotating the drills, so that the drills
and connected parts are thus suspended in the two loops of the second endless
rope from the two pulleys on the tubular shaft, the axes of one set of grooved
pulleys on the tubular shaft, being at a right angle to the other set on the drill
spindles and the weight of the parts on the loops of the endless ropes, gives
sufficient adhesion to drive the drills.
The endless rope driving the middle grooved pulley fast on the tubular shaft,
has a guide pulley connected with a weight sufficient to counterbalance the weight
of the suspended drill and driving mechanism.
There is a small pulley with a series of grooves fast on the boss of the grooved
pulley rotating loose on the tubular shaft, and this drives by an endless band or
rope the similar pulley hereinbefore referred to on the worm shaft for the self-
acting feed motion.
Between the drill mechanism and the driving mechanism above it there are rods,
the lower ends of which are secured in the frame part of the drill mechanism and
the upper ends of which slide freely through sockets on the frame or axis part of
the tubular shaft having three grooved pulleys. These rods are used if desired to
keep the driving and drill mechanism square to each other and at the same time
to allow the parts to give way to any shortening or lengthening of the endless
driving rope between the two.
If desired springs are or may be arranged upon the rods, above referred to, to
put tension, in addition to the gravity of the drill mechanism, upon the driving
endless rope.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Severin Borland in the Great Seal Patent Office on the
18th October 1883.
SEVERIN BORLAND, of the City of Manchester, in the County of Lancaster,
Engineer, "IMPROVEMENTS IN MECHANISM AND ARRANGEMENTS FOR DRILLING
BOILER SHELLS, FLUES AND OTHER ARTICLES,"
My invention consists in improved arrangements and constructions of mechanism,
designed more especially, for drilling rivet holes in metal cylinders for steam
boilers, but which may be used for other drilling purposes.
Two drill spindles are arranged end to end, in the same axial line, to rotate in.
the same direction, but reversely in relation to each other, and the bearings for
these drill spindles are carried on two pairs of disc plates, as hereinafter descibed,
and these pairs of disc plates, are connected by bars or bolts passing through tubes
that keep the disc plates at their proper distance apart. Between each pair of disc
plates there is a grooved pulley the boss of which has its bearings in the disc
plates and is connected by a key and key groove with its drill spindle so as to
rotate it, while permitting the spindle to be slided to and fro, to push out or draw
in the drill.
Between the bosses of the two grooved pulleys and around the drill spindles,"
there is a tube or boss upon which there is a wheel which forms both a hand and
worm wheel, for giving the to and fro motion to the drill spindle.
In the interior of the boss, of the hand and worm wheel, there is a right hand
screw thread in one part of the boss for one drill spindle, and a left handed screw
thread in the other part of the boss for the other drill spindle.
There are also corresponding screw tubes in the right and left handed screwed
boss, in the interior of which screw tubes each spindle can rotate, but the spindle
in each case is connected to its screw tube so as to move endways with it, and
each screw tube is prevented from rotating with its spindle by a key and key
groove.
The worm and hand wheel is arranged to gear with a worm on a shaft when the
feed of the drills is to be made selfacting, and this worm shaft is in bearings in an
excentric tubular part having bearings on the cross bars or parts connecting the
disc plates so that by turning the tubular excentric by a handle the worm is
brought in and out of gear with the worm and hand wheel when required
The worm shaft has a pulley with a series of grooves in it to be rotated by an
endless rope or band from another similar pulley hereinafter referred to.
The drill spindles are arranged either to receive the drills, or chucks to hold the
drills, and both drill spindles are rotated in the same direction, so that the same
drill will do for either spindle.
In a position directly over the mechanism above described and at any convenient
distance, there is a tubular shaft, having three grooved pulleys upon it, namely; a
middle pulley fast or loose on the tubular shaft and two other pulleys at equal
distance from the middle grooved pulley both free to rotate loose on the tubular
shaft, but one of them is arranged to be brought into gear with the boss of the
middle pulley fast or loose on to the tubular shaft by a clutch actuated by a pin
sliding in the tubular shaft.
Motion is conveyed from the driving power by an endless rope passing over
suitable guide pulleys, and then to the middle grooved pulley on the tubular shaft
above referred to, which is thus suspended in the loop of the rope and another
endless rope is made to pass over the two grooved pulleys loose on the tubular,
J

page_text: shaft and under the two grooved pulleys for rotating the drills, so that the drills
and connected parts are thus suspended in the two loops of the second endless rope
from the two pulleys on the tubular shaft, the axes of one set of grooved pulleys
on the tubular shaft being at a right angle to the other set on the drill spindles
and the weight of the parts on the loops of the endless ropes gives sufficient
adhesion to drive the drills.
The endless rope driving the middle grooved pulley fast or loose on the tubular
shaft, has a guide pulley connected with a weight sufficient to counter-balance, the
weight of the suspended drill and driving mechanism.
+
There is a small pulley with a series of grooves fast on the boss of the grooved
pulley rotating loose on the tubular shaft, and this drives by an endless band or
rope, the similar pulley herein before referred to on the worm shaft for the selfacting
feed motion.
Between the drill mechanism and the driving mechanism above it there are rods,
the lower ends of which are secured in the frame part of the drill mechanism, and
the upper ends of which slide freely through sockets on the frame or axis part of
the tubular shaft having three grooved pulleys-These rods are used to keep the
driving and drill mechanism square to each other and at the same time to allow the
parts to give way to any shortening or lengthening of the endless driving rope
between the two.
If desired springs are or may be arranged upon the rods above referred to, to
put tension in addition to the gravity of the drill mechanism upon the driving
endless rope.
Fig 1 is a side elevation one half shown in section and fig 2 is a sectional
elevation taken at a right angle to fig 1.
a and a¹ are pairs of disc plates, each pair being kept apart by short tubes a³
and the two pairs of plates are kept apart by a tubular bar a³ and a tubular
casting a the plates being secured together by three bolts a³ passing through the
tubular parts as shown
Between each pair of disc plates there is a grooved pulley b and each pulley has
its bearing in a bush or brass part a secured in one (a) of each pair of discs and
the pulleys b rotate in their bearings and are held from end movement by fitting
between the disc plates as shown.
Fitting the boss of each pulley is a spindle c formed at its outer end to receive
the shank of the drill or a chuck for the drill, a chuck being added when the drill
and drill spindle are not long enough.
The drill spindle c rotates with the grooved pulley b being connected with it by
a key c¹ and key groove which admits of the end movement of the spindle in the
boss of the grooved pulley.
The inner end of the spindle c is reduced in diameter to fit and rotate freely in a
tubed and the spindle and tube are connected by forming a "neck" in the spindle
to fit a ring d' that can be placed in the neck in two halves and passed into the
tube d and then secured in it by one or two pins d' passing across through the
tube and through grooves in the two halves of the ring d for the neck.
Thus arranged the spindle c can rotate and move endways with the tube d and
rotate in it, as the tube is prevented from rotating with the spindle by a key d*
and key groove, the key dx being secured in a bush a* in the disc a'.
The exterior of the tube d is screwed to fit a corresponding screw thread in the
interior of the boss of the screw or band wheel e.
The screw thread for one drill spindle is made reverse to that for the other drill
spindle so that the rotation of the hand wheel e will cause both drill spindles to
move outwards or inwards simultaneously.
в
The inner end of each screw tube d has a screw d³ in it to screw against a steel
disc d in the interior of the screw tube which comes against the end of the spindle,
and this screw tail pin d' acts to take the end pressure coming upon the drill
spindle, when drilling, and the ring d in two halves in the neck of the spindle acts
to draw back or pull the drill spindle inwards,

page_text: The periphery of the hand wheel e is toothed to gear with a worm el on a
shafte which rotates in bearings in a hollow shaft e³ having bearings in the
casting a*.
The shaft eis excentric to the hollow shaft e³ which can be oscillated by the
handle e to bring the worm e¹ in and out of gear, when required, with the teeth of
the hand or worm wheel e.
.
On one end of the worm shaft e' a small pulley e" is secured with grooves of
different diameters for an endless band to work upon, driven by another similar
pulley as hereinafter described.
The casting a has four sockets a into each of which one end of a rod f is
screwed the other end passing and sliding freely through a socket in the casting g
for the driving pulleys, which casting has bearings for a hollow shaft h upon which
a central grooved pulley i is secured or left to rotate freely.
There are also two other grooved pulleys j and j' on this hollow shaft h, but they
are free to rotate upon it and are kept in their places by a collar h¹ on each end of
the tubular shaft h.
Within the tubular shaft there is a rod ' which has a hole for a cottar h³ passing
through a slot in the hollow shaft h, and the ends of this cottar h' when the rod h
is moved endways one way will come into a groove or teeth across the end of the
boss of the pulley ; and cause it to rotate with the tubular shaft h, and when
moved the other way will put it out of gear.-There is a handle h* on the outer
end of the rod h' secured to it as shown, to allow it to rotate in the boss of the
handle when the latter is held.
The endless driving rope band or belt k passes say first from the pulley ; down
and under the pulley b for one drill, up from it to the pulley 1, down from the
latter to the other pulley b for the other drill under it and then back to the
pulley j.
On the boss of the pulley j³, is a small speed pulley e corresponding to that on
the feed worm shaft e³.
On each of the rods f there is or may be a helical spring f¹ one end acting
against a tube or continuation of the socket g¹, the other end against a screw f* by
which the pressure of the spring may be adjusted so that suitable tension may be
put upon the driving rope or belt k in addition to that brought upon it by the
weight of the drill mechanism.
The grooves in the pulleys are shown round but may be of V form, or flat if
desired, for a belt.
The first driving rope acts upon the central pulley i and the whole mechanism
is suspended in the loop of this driving rope and it is arranged, driven and
counterbalanced in a manner well known and understood.
I have now particularly described the nature of my said invention and the
manner of carrying the same into effect, and claim as my invention,
Firstly, The combination and arrangement of suspended drilling mechanism,
substantially as hereinbefore described and illustrated by the drawings.
Secondly. The driving of both drill spindles reversely to each other so that
the drills will rotate in the same direction, substantially as hereinbefore described.
In Witness whereof I the said Severin Borland have hereunto set my
hand and seal this twelfth day. of October in the year of our Lord one thousand
eight hundred and eighty three.
SEVERIN DODT AND