Improved Apparatus or Attachment to Drilling and like Machines for Drilling Holes of Various Shapes or Shaping the Exterior Surfaces of Objects.
Year: 1891

page_text: .
Date of Application, 23rd Feb., 1891
Complete Specification Left, 19th Nov., 1891-Accepted, 13th Feb., 1892
PROVISIONAL SPECIFICATION.
Improved Apparatus or Attachment to Drilling and like Machines
for Drilling Holes of Various Shapes or Shaping the Exterior
Surfaces of Objects.
JAMES WILLIAM CLARIDGE 22 The Waldrons Croydon Surrey Engineer do
hereby declare the nature of this invention to be as follows:-
:-
This invention relates more especially to that kind which may be attached to
machines already in use for boring round holes & consists of two principal parts,
that which carries the drill fitting in the socket of the spindle & being made in
this or other convenient way to revolve with the spindle & the second which holds
the template being attached to the frame of the machine or part thereof in any
suitable manner. The drill carrier is hollowed transversely to permit of the
drill & its connections having any desired lateral play. The drill is suspended &
is free to move about a point in the centre line of the carrier on trunnions or in
other bearing. The drill is held over by a spring fixed to the carrier so that a
roller or the like on it is free to rotate in the template held in the attachment
against the action of the spring.
The same result may be attained by the employment of a projection on the drill
& a second template in the attachment, the shaping point of the drill being always
in its centre line. The template or template and connections may be made free to
slide vertically in the attachment simultaneously with the spindle & drill carrier or
they may be fixed thereto or the travel may be regulated relatively to the spindle
in any desirable manner. Arrangements are made for changing the template
when holes of different cross sections are required. The template may in sectional
elevation be vertical, tapered, angular or curved as desired & the holes drilled
accordingly. The roller on the drill may thus describe a larger or smaller path &
the template be arranged that the roller will eventually fill it. The range of sizes
drilled will thus be anything within the capacity of the attachment & carrier & in
the limit there will be no lateral play on the drill whatever.
It is obvious that similar dispositions may be given to special machines for
drilling holes of various shapes whether these machines are fitted with springs or
not. In these cases the template may be made to slide vertically or not with the
spindle in the fixed top head of the machine & the lower head with the spindle &
oscillating bearing slide on the main frame of the machine.
The template may be similarly varied in section & may be fixed or have a
separate vertical movement relative to the slide carrying the spindle & the largest
possible range of size given to the hole drilled according to the capacity of the
machine. In the smallest limit there will be no lateral movement of the spindle,
it will become vertical & a round hole be drilled.
Similar dispositions also apply when slotting motion is added & either in the
form of an attachment to machines already in use or in special machines. Holes
may thus be bored with sides having different vertical sections.
All the above remarks apply when the outsides of objects are operated upon
instead of the insides.
Dated this 21st day of February 1891.

page_text: COMPLETE SPECIFICATION.
Improved Apparatus or Attachment to Drilling and like Machines
for Drilling Holes of Various Shapes or Shaping the Exterior
Surfaces of Objects.
I, JAMES WILLIAM CLARIDGE 22 The Waldrons Croydon Surrey 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 :—
My invention relates to an attachment or attachments for applying to machines
already in use for drilling round holes by which holes of various shapes may be
drilled & also to special machines for the same purpose. The objects I have in
view are in the one case the being able to employ additions to ordinary drilling
machines which shall be much cheaper than special machines & in the other the
improvement of special apparatus over that now existing. In the latter case the
parts are fewer and simpler & generally a greater variety of work may be accom-
plished than at present. The advantages obtained may be described as follows:-
(a) By applying to an ordinary drilling machine two principal parts, one rotating
with the spindle containing the drill or cutter & the other fixed to the frame of
the machine carrying the form for regulating the shape of hole to be drilled.
(b) By making in the attachment & in the special machine the distance between
the form or forms in which the roller runs & the roller capable of variation, by
tapering or otherwise shaping one or both of thein & with movement in the line of
the spindle in one case so altering the throw of drill or spindle that the size of hole
drilled may be regulated.
(c) By making this variation such that in the extreme limit one way there will
be no throw of the drill or spindle & a round hole be thus drilled without removal
of the form which regulates the shape of the hole to be drilled.
(d) By dispensing with several forms giving one shape & using only one from the
extreme limit in one direction, the largest size drilled, to that in the other, which
may be a round hole.
(e) By being able to drill various vertical sections of hole irrespective of what
the plan of such hole may be.
With the aid of the accompanying drawings I will now proceed to explain in
detail my methods of carrying out the various improvements.
Fig. 1. is a vertical section of the attachments to an ordinary drilling machine.
Fig. 2. is a section on the line A B in Fig. 1.
Figs. 3 & 4 are elevation & section of the drill carrier as shewn in Fig. 1.
Fig. 5 is a sectional elevation of the parts necessary to be shewn of a special
machine.
Fig. 6. is a section on the line C D in Fig. 5.
Fig. 7. is a section on the line E F in Fig. 5.
Fig. 8 is the detail at e e in Fig. 5 in elevation & plan.
Fig. 9 shews some of the shapes in vertical section that may be drilled by means
of these improvements.
In Figs. 1, 2, 3, & 4 G G is the drilling spindle into which the drill carrier H is
fitted.
The drill I is shewn supported in trunnions at i & having an arm K with a
roller k, at the end. The arm K is held over in the form M by the spring / but
the arrangement for which protection was obtained in No. 20716-90 or any other
may be adopted for the purpose. The carrier is screwed on the outside & a nut L
has two or more plates, m m let into it which also are bolted to the form M. The
form is struck on its top level that the drill may cut the shape desired, which is in
this case an oblong with rounded ends & at the bottom to a circle, while on the
outside it is made to slide up & down with the spindle in a groove in the holder N

page_text: which is bolted centrally on the frame of the machine. The action is then as
follows: The form being shaped to take the largest size of hole the turning of
the nut L raises the form M in the holder so that the arm K is now at the point
shewn in the drawings to give a certain size hole. To taper a hole any means may
be adopted whereby the nut L may be turned while the main spindle is descending.
To take out the form M & insert another the plates m m are removed & the form
is then free to drop out.
In Figs. 5, 6, 7 & 8 I, is the spindle of the special machine M, the form which
is bolted to the seat H, capable of sliding in grooves h h in the top head N. The
outside of this seat is screwed to receive the nut L, which is prevented from rising
when turned by the plates m, m. This nut on its outside forms a toothed wheel
into which the pinion o gears. By revolving the hand wheel p the seat H, & the
form M, may be raised or lowered, the throw of the spindle regulated & the size
of hole drilled accordingly. The main spindle O being driven by ordinary means
motion is communicated through the gearing R R, to the spindle I, in the bottom
head of the machine. The spindle is seen to be flat on two sides & rounded on the
others to admit of oscillation. When the machine is set for a certain size of hole
the handwheel P is turned to give necessary depth by lowering the whole system
on the slides Q. may after the manner well known in the screw cutting lathe
connect the shafts p, & P, by means of suitable gearing & so with a movement on
one handwheel drill a taper hole.
It will be observed I prefer to regulate the distance between the form & the
roller by the alteration of the section of the first named, this being the more
practical method. It is obvious however I can on the same principle taper the
roller instead of the form if I please.
Having now particularly described & ascertained the nature of my said inven-
tion & in what manner the same is to be performed, I declare that what I
claim is
(1) In an ordinary drilling machine for drilling round holes the fitting an
attachment or attachinents in which a drill or holder carrying a form are mounted
substantially as shewn & for the purposes described.
(2) In an apparatus such as described in Claim 1 a form which for any
particular shape of hole to be drilled is tapered or otherwise shaped so as to give
the greatest possible range of sizes of holes drilled that the apparatus is capable of
with one form, as described & shewn.
(3) In a special machine or attachment to an ordinary machine the combination
of a form & roller by the shaping of one of which in vertical section & the
movement of either in a line with the spindle the throw of the spindle or drill is
altered & the greatest possible range of sizes of holes drilled given that the
apparatus is capable of with one form, as described & shewn.
(4) In a special machine or attachment to an ordinary machine the being able
to vary the positions of the form & roller with relation to each other that the
spindle or drill may become vertical while the form is still in place as described
& shewn.
Dated this 19th day of November 1891.
JAMES WILLIAM CLARIDGE.