IMPROVEMENTS IN DRILLING MACHINES
Year: 1877

page_text: LETTERS PATENT to John Tweedy, of Sunderland, in the County of Durham,
Engineer, for the Invention of " IMPROVEMENTS IN DRILLING MACHINES."
Sealed the 28th August 1877. and dated the 29th March 1877.
PROVISIONAL SPECIFICATION left by the said John Tweedy at the Office
of the Commissioners of Patents on the 29th March 1877.
JOHN TWEEDY, of Sunderland, in the County of Durham, Engineer. "IMPROVE-
MENTS IN DRILLING MACHINES."
My Invention has reference to the class of drilling machines wherein the frame or
saddle carrying the drill has a movement in a vertical plane on a pillar or main or
upright, the main upright having a horizontal traverse and suitable bed, and my
Invention consists in providing on the main upright a guide of the form of a sector
of a ring, so that the drill carried by the saddle traversing the guide shall be
maintained in a radial direction; and in an arrangement of wheels and sliders or
blocks, whereby a revolving shaft, having its longitudinal axis fixed, with regard to
the main upright, in a direction parallel or nearly so to chord of the arc described
by the saddle in its traverse over the circular guide, may be caused to communicate
motion to the drill shaft or spindle, the position or direction of which varies in the
same or a parallel plane.
The curved guide is fixed or cast in a vertical plane on the main upright. The
saddle slides on the curved guide, and has an opening parallel to the drill spindle,
in which slides a block; a second block sliding in guides formed in the main
upright parallel to the driving shaft, and carrying in the axis of a couple of bevel
wheels, has on one side of it a circular projection, which fits into a suitable recess
provided in the block carried by and sliding in the saddle; one of the bevel wheels
is actuted through a third bevel wheel feathered to and capable of travelling on the
driving shaft; the other of the two first-named bevel wheels, through another bevel
wheel, drives the drill spindle and drill; the drill spindle is capable of movement
endwise through the boss of the last-mentioned wheel.
This arrangement will enable holes to be drilled radially and with great facility
in the circumference of cylindrical articles, having their longitudinal axis horizontal,
parallel with the bed of the machine, and concentric with the circular guide on the
main upright.

page_text: The article to be drilled is supported on wheels, by turning which, by suitable
mechanism, such as a worm and wheel arrangement, it may be moved round to any
required position, recesses being formed on the peripheries of the wheels to allow
projections, such as bolts, straps, and the like, to pass the wheels. One or more
machines may be used on a single bed.
The arrangement of wheels and sliders, through which motion is communicated to
the drill spindle, may be applied to drilling machines where the horizontal guide for
the traverse of the pillar is of the form of a sector of a ring, and the upright pillar
vertical with straight guides, one of the blocks or sliders moving in guides formed
in the base of the main upright, and the other in guides formed in the hori-
zontal bed.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Tweedy in the Great Seal Patent Office on the 17th September
1877.
JOHN TWEEDY, of Sunderland, in the County of Durham, Engineer. "IMPROVE-
MENTS IN DRILLING MACHINES."
My Invention has reference to the class of drilling machines wherein the frame
or saddle carrying the drill has a movement in a vertical plane on a pillar or main
upright, the main upright having a horizontal traverse on a suitable bed, and my
Invention consists in providing on the main upright a guide of the form of a sector
of a ring, so that the drill carried by the saddle traversing the guide shall be
maintained in a radial direction; and in an arrangement of wheels and sliders or
blocks, whereby a revolving shaft, having its longitudinal axis fixed with regard to
the main upright, in a direction parallel or nearly so to the chord of the arc
described by the saddle in its traverse over the circular guide, may be caused to
communicate motion to the drill shaft or spindle, the position or direction of which
varios in the same or a parallel plane.
The curved guide is fixed or cast in a vertical plane on the main upright. The
saddle slides on the curved guide, and has an opening parallel to the drill spindle,
in which slides a block; a second block sliding in guides formed in the min
upright parallel to the driving shaft, and carrying the axis of a couple of bevel wheels,
has on one side of it a circular projection, which fits into a suitable recess provided
in the block carried by and sliding in the saddle; one of the bevel wheels is
actuated through a third bevel wheel feathered to and capable of travelling on the
driving shaft; the other of the two first-named bevel wheels, through another bevel
wheel, drives the drill spindle and drill. The drill spindle is capable of movement
endwise through the boas of the last-mentioned wheel.
This arrangement will enable holes to be drilled radially and with great facility
in the circumference of cylindrical articles, having their longitudinal axis horizontal,
parallel with the bed of the machine, and concentric with the circular guide on the
main upright.
The article to be drilled is supported on wheels, by turning which, by suitable
mechanism, such as a worm and wheel arrangement, it may be moved round to any
required position, recesses being formed on the peripheries of the wheels, to allow
projections such as bolts, straps, and the like, to pass the wheels. One or more
machines may be used on a single bed.
The arrangement of wheels and sliders, through which motion is communicated
to the drill spindle, may be applied to drilling machines where the horizontal guide
for the traverse of the pillar is of the form of a sector of a ring, and the upright
pillar vertical with straight guides, one of the blocks or sliders moving in guides
formed in the base of the main upright, and the other.in guides formed in the hori-
zontal bed.
And in order that my Invention may be clearly understood, I hereunto append a

page_text: Sheet of Drawings, of which Fig. 1 is an end elevation; Fig. 2, a side elevation,
shewing two machines on one base plate, one of which is shewn in section; and
Fig. 3 is a plan view of a drilling machine embodying my Invention; in this
Figure also one of the machines is shown in secton. Figures 4 and 5 are detached
views of the sliders or blocks.
The same letters of reference are used to denote like parts in all these Figures.
A is the base plate of the machines, whereof B is the main upright, having the
curved guide C cast or bolted to it; D is the drill saddle carrying in suitable
bearings the sleeve or case E, through which the drill spindle F is free to move
endwise. In the straight guide H, formed on the curved guide, slides a block I
carrying the axis J of the bevel wheels K and L; a boss M cast on the block
concentric with the axis J fits into a recess provided in the block G, which latter
block slides in an opening formed in the saddle D. The bevel wheel N is feathered
to the sleeve E, and is maintained in gear with the wheel K. above referred to by
the projecting arın O cast on the block G. The bevel wheel L, also referred to
above, is geared into the wheel P, which is rotated by being feathered upon the
shaft Q, the shaft Q being actuated through the wheels R, R; the shaft S and a belt
from the main shafting passing over the pulley T. The friction clutch U, provided
to engage the wheels R, R, permits the machine to be stopped or started at the will
of the operator.
The horizontal adjustment of the drill is obtained by traversing the main upright
Balong the base plate A by means of the hand wheel a, worm b, worm wheel c, and
the pinion d, the latter being geared into the rack e provided in the base plate.
The vertical adjustment is effected by moving the saddle up or down the circular
guide, for which purpose the hand wheel fand bevil wheels and are provided,
the wheel being screwed to take the screwed shaft k. The adjustinent of the drill
in a radial direction is secured by moving the drill towards or away from the article
that is being drilled, this movement being produced by means of the haud wheel,
worms, worm wheels, and pinion, shewn at ; these latter, when in gear with the
small coned pulleys m, form an automatic feed motion.
Fig. 6 is an end elevation shewing part of a machine of the above construction,
with a boiler shell in position for being drilled. The shell is supported upon the
wheels A, which when rotated by means of the worn and wheel B, B, move the
shell round to any required position. The pedestals, carrying the wheels A, A, can
be moved from or toward each other, so as to permit larger or smaller work to be
operated upon marks being provided upon the base upon which the pedestals rest,
so that the axis of the work always coincides with that of the curved guide.
Machines constructed according to my Invention enable holes to be drilled in
the shells of boilers or other circular work in a more expeditious and accurato
manner than can be done by ordinary machines, as no special or supplementary
adjustment is required to give the drill the required radial direction. Moreover
this machine will drill articles of any length, thus permitting the shells of boilers to
be completely plated before being brought to the machines to be drilled.
The arrangement of wheels and sliders through which motion is communicated
to the drill spindle, of the above described machine, is shewn in Figures 7 and 8
applied to a machine having the circular guide horizontal; Fig. 7 being a longitu-
dinal elevation partly in section; and Fig. 8, an end elevation partly in section.
A is the horizontal circular guide; B is the upright pillar; D, the drill saddle
traversing the upright pillar; H is a straight guide formed in the base plate parallel
to the driving shaft Q. Sliding in the guide H is a block I carrying the axis J of
the bevel wheels K and L; a boss M cast on the block I concentric with the axis J
fits the recess provided in the block G, which latter slides in an opening provided
in the foot of the main upright. The vertical shaft S, geared to the drill spindle in
the ordinary way, is rotated through the wheels M, N; on the axis of the wheel N is
feathered the wheel O, which being geared into the wheel L is rotated through the
wheels L, K, and P, and driving shaft Q.
Having described my said Invention for "Improvements in Drilling Machines,"

page_text: and having explained the manner of carrying the same into practical effect, I desire
to have it understood that I do not claim as of my Invention the making the
horizontal guide for the traverse of the pillar in the form of a sector of a ring, the
upright pillar being vertical with straight guides, nor, save and except as herein-after
mentioned, do I intend to claim any of the mechanical parts of the apparatus
lierein-before shewn and described when taken separately and apart from the
combination or application thereof, in manner and for the purposes herein
described, but what consider to be novel and original, and therefore claim as
secured to me by the herein-before in part recited Letters Patent is,-
1. In a drilling machine providing the main upright with a guide having the
form of a sector of a ring, so that the drill carried by the saddle traversing the said
guide shall be maintained in a radial direction, as above described.
2. The method of operating the drill by the use, in conjunction with a circular
guide of the system of wheels and sliders or blocks constructed, arranged, and
operating as shewn in and described with reference to the accompanying Drawings,
whether the circular guide be vertical or horizontal.
In witness whereof, I, the said John Tweedy, have hereunto set my hand and
seal, this Fourteenth day of September, in the year of our Lord One
thousand eight hundred and seventy-seven.