Improvements in Drilling Machine Attachments.
Year: 1894

page_text: Date of Application, 8th Feb., 1894
Complete Specification Left, 7th Nov., 1894-Accepted, 8th Dec., 1894
PROVISIONAL SPECIFICATION.
Improvements in Drilling Machine Attachments.
I, JOHN JAMES STEVENS, of the Firm of Messrs. Stevens, Hamilton & Company
of Galt in the Province of Ontario, Canada, Manufacturers, do hereby declare the
nature of this invention to be as follows:-
My invention relates to an attachment for application to large drilling machines
to enable holes of a small size to be drilled and it consists of a spindle formed in two
parts, one part adapted to fit in the hole in the drilling machine spindle, and the
other part adapted to carry a clutch for carrying the small drill. The two parts of
this spindle are connected together by any suitable form of speed gearing so that
the speed of the small chuck on the lower end of the spindle is multiplied about four
times. This gear is enclosed in a suitable box formed in two parts and having
sleeves forming bearings for the two parts of the spindle, the said box being
prevented from rotating by means of an arm carried thereby and adapted to engage
with some fixed part of the drilling machine. The lower part of the drill spindle
carrying the small chuck is mounted in a sleeve which is adapted to slide vertically
in the bearing formed by the lower part of the box to provide for the feed of the
small drill independent of the feed of the drilling machine. The said sleeve has a
rack cut or formed in it with which gears a pinion carried by a spring controlled
spindle which is operated by a suitable lever, the spring being adapted to restore
the drill spindle to its normal position after it has been depressed for drilling a
hole.
The form of speed gear which I prefer to use consists of two spur pinions of
different sizes the larger one fixed on the end of the upper part of the spindle and
the smaller one on the end of the lower part of the spindle, each of the said pinions
gearing with a double spur pinion mounted on a pin carried by the box. I prefer
to form the double pinion in two parts connected together by a frictional device
capable of being adjusted from the outside of the box, so that the small drill is
driven through frictional contact only, which will allow it to stop instantly
should the drill meet with any undue strain thus preventing it from breaking or
twisting up.
It will be seen by the use of this attachment that the work usually done in a
sensitive drilling machine can be done in the largest drilling machines with perfect
safety.
Dated this 8th day of Fohm 1801
COMPLETE SPECIFICATION.
Improvements in Drilling Machine Attachments.
I, JOHN JAMES STEVENS, of the Firm of Messrs. Stevens, Hamilton & Company
of Galt in the Province of Ontario, Canada, Manufacturers, 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 an attachment for application to large drilling machines
to enable holes of a small size to be drilled, and it consists essentially of a spindle

page_text: formed in two parts, one part adapted to fit in the hole in the drilling machine
spindle, and the other part adapted to carry a clutch for carrying the small drill.
The two parts of this spindle are connected together by any suitable form of speed
gearing so that the speed of the small chuck on the lower end of the spindle is
multiplied about four times. This gear is enclosed in a suitable box formed in two
parts and having sleeves forming bearings for the two parts of the spindle, the said
box being prevented from rotating by means of an arm carried thereby and adapted
to engage with some fixed part of the drilling machine. The lower part of the drill
spindle carrying the small chuck is mounted in a sleeve which is adapted to slide
vertically in the bearing formed by the lower part of the box to provide for the
feed of the small drill independently of the feed of the drilling machine. The said
sleeve has a rack cut or formed in it with which gears a pinion carried by a spring-
controlled spindle which is operated by a suitable lever, the spring being adapted
to restore the drill spindle to its normal position after it has been depressed for
drilling a hole.
The form of speed gear which 1 prefer to use consists of two spur pinions of different
sizes the larger one fixed on the end of the upper part of the spindle and the smaller
one on the end of the lower part of the spindle, each of the said pinions gearing
with a double spur pinion mounted on a pin carried by the box. I prefer to form
the double pinion in two parts connected together by a frictional device capable of
being adjusted from the outside of the box, so that the small drill is driven through
frictional contact only, which will allow it to stop instantly should the drill meet
with any undue strain thus preventing it from breaking or twisting up.
In the accompanying drawing which illustrates my invention:-
Figure 1 is a view in elevation.
Figure 2 is a view in sectional elevation, and
Figure 3 is a view in plan.
Throughout the views similar parts are marked with like letters of reference.
Referring to the drawings A and A' designate the two parts of the spindle the
shank of the top part A being of the standard taper so that it can be attached to
a drilling machine spindle as quickly as changing a drill. The lower part A¹ of the
spindle carries a chuck B for carrying the small drill. The two parts A and A' of
the spindle are connected together by any suitable speed gear, whereby the speed
of the small drill is multiplied about four times. This speed gear is enclosed in a
suitably shaped box C formed in two parts held together in any convenient manner,
the upper part carrying a sleeve c forming a bearing for the part A of the spindle
which is drilled or formed with a cavity a¹ to allow the upper portion of the lower
spindle A' to rise therein. The lower part of the box C carrying a sleeve c¹ forms
a bearing for the part A' of the spindle which is mounted in a sleeve D adapted to
slide vertically in the bearing sleeve c', the rotation of the sleeve D being prevented
by forming a key-way d therein with which engages a stud or pin 2 carried by the
bearing sleeve c¹. This sleeve D has a rack d₁ cut or formed in it with which
engages a pinion e carried by a spindle E mounted at right angles to the spindle A¹
in a suitable bearing F formed on or attached to the sleeve c¹. The spindle E is
provided with a suitable lever or handle whereby it can be rotated to operate the
sleeve D carrying the lower part A' of the spindle, a suitable spring G acting on
the spindle E being provided to raise the part A¹ of the spindle after it has been
depressed.
The box C is prevented from rotating by means of an arm or lever H attached
to the bearing For to any other convenient part of the box and adapted to come
into contact with the frame of the drilling machine.
The form of speed gear which I prefer to use consists of two spur pinions J and K
of different sizes, the larger one J being fixed on the lower end of the part A of
the spindle and the smaller one K being mounted on the upper end of the part A'
of the spindle in such a manner as to allow the spindle A' to have a vertical motion
as well as a rotary one. This is conveniently done by cutting a key-way a² in the
spindle and forming a feather k on the pinion to engage therewith. Each of the said

page_text: pinions J, K, gearing with a double spur pinion mounted on a suitable stud pin L
carried by the box C. The double spur pinion is formed in two parts. M and M'
connected together frictionally so that the small drill is driven through frictional
contact only which will allow it to stop instantly should the drill meet with any
undue strain, thus preventing it from breaking or twisting up. I obtain an adjustable
frictional contact between the spur pinions M and M' in the following manner :-
The spur pinion M is formed on or fixed to a sleeve m which is mounted so as to rotate
freely on the stud pin L. The spur pinion M' is loosely mounted on the sleeve m,
a metal washer N and a leather washer N¹ being interposed between the faces of the
two pinions. A thumb nut O is screwed on to the end of the sleeve m which is
threaded-preferably with a left-handed thread-to receive it and which projects
through the box C so that it can be operated from the outside. Between this nut
and the pinion M' are interposed other metallic and leather washers N and N', so
that the friction between the two pinions can be varied as desired.
It will be seen that by the use of this attachment the work usually done in a
sensitive drill press can be done equally well in the largest drilling machine and with
as great safety.
I wish it to be particularly understood that I do not limit myself to the precise
details of construction herein before described and illustrated by the accompanying
drawing, but that I hold myself at liberty to make such changes and alterations as.
fairly fall within the spirit and scope of my invention.
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 improved attachment for drilling machines substantially as hereinbefore
described and illustrated by the accompanying drawing.
(2.) An attachment for converting a large drilling machine into a sensitive drill,
consisting essentially of a spindle formed in two parts one part being adapted to be
attached to the spindle of the drilling machine and the other or lower part having a
chuck for carrying the small drill, of a box carrying sleeves forming bearings for
the two parts of the spindle, of a speed gear for multiplying the speed of the lower
part of the spindle carrying the small drill, of an arm or lever for preventing the
rotation of the box carrying the divided spindle, and of the feeding device for
feeding down the small drill and automatically restoring it, as set forth.
a
(3.) An attachment for converting a large drilling machine into a sensitive drill
consisting essentially of a spindle formed in two parts one part being adapted to be
attached to the spindle of the drilling machine and the other or lower part having a
chuck for carrying the small drill, of a box carrying sleeves forming bearings for
the two parts of the spindle, of a speed gear for multiplying the speed of the lower
part of the spindle carrying the small drill, of a frictional device for connecting the
parts of the train of wheels forming the speed gear, of an arm or lever for preventing
the rotation of the box carrying the divided spindle, and of the feeding device for
feeding down the small drill and automatically restoring it, as set forth.
Dated this 7th day of November 1894
ROBERT E. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.