Improvements in and connected with Machines for Drilling Square or any other Shaped Holes and for analogous purposes.
Year: 1890

page_text: Date of Application, 19th Dec., 1890
Complete Specification Left, 9th Mar., 1891-Accepted, 18th Apr., 1891
PROVISIONAL SPECIFICATION.
Improvements in and connected with Machines for Drilling Square
or any other Shaped Holes and for analogous purposes.
We, JAMES WILLIAM CLARIDGE, 35, Parliament Street, Westminster, London,
Engineer, and REGINALD EMPSON MIDDLETON, 35, Parliament Street, West-
minster, London, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in the Tyler and Ellis square drilling
machine, for which complete protection has already been granted, No. 3850/90. In
the present improvements, instead of keeping the roller on the drilling spindle or
its sleeve by means of two spiral springs, we substitute a second cam or template
struck to such dimensions that a line drawn through the centre of the spindle, from
the face of one cam or template to the face of the other, shall always be of the same
length, thus a roller placed on the opposite side of the spindle to the point of
contact of that used in the Tyler and Ellis machine will always remain in contact
with the second cam or template and maintain the contact of the first roller with its
cam or template. The contact of the second roller and through it of the first
roller, is maintained to meet any small irregularities in the cams or templates. The
arm which carries the second roller is capable of being moved so that it is free from
its template or cam, when it is desired to bring the drilling spindle into a vertical
position for drilling round holes.
To attain this latter object the spindle is provided with a projection of a conical
shape, and a revolving part of the machine which always maintains the spindle in a
vertical plane in one direction but which allows it lateral play in the other direction
is provided with a conical aperture. To this revolving portion of the machine the
arm carrying the second roller is attached. By one motion of the lever the
revolving part of the machine and the arm carrying the roller are moved vertically,
the arm is freed from the template, and the cones are brought into contact, the
spindle being brought into a vertical position.
We can do without an inner spindle and make a solid one by varying the position
of the ball bearing vertically. The same length of spindle may thus be used always,
and the work operated upon by moving the main head up and down.
This arrangement gives double the range of sizes that can be drilled by the one
machine for the same vertical movement. If in addition we use an inner spindle we
thereby obtain the effect of our present machine in addition to that given by
moving the ball bearing. We may also remove the driving gear from the upper or
weakest part of the spindle or its sleeve to the ball bearing where it is strongest.
We may apply also to the Tyler and Ellis or any similar machine an indicator
which by the motion of the drilling spindle upwards or downwards will register the
dimensions of the hole to be drilled either in actual dimensions or proportionately
and will in the improved machine by the combined motion of the spindle upwards
or downwards and at the ball bearing in its vertical plane or by each separately
register the dimensions of the holes to be drilled by the tool with reference to the
normal template used either proportionately or in fixed dimensions when the tool
is for the smallest dimension at a given distance from the ball bearing.
Dated this 19th day of December 1890.
JAMES WILLIAM CLARIDGE.
REGINALD E. MIDDLETON.

page_text: COMPLETE SPECIFICATION.
Improvements in and connected with Machines for Drilling Square
or any other Shaped Holes and for analogous purposes.
JAMES WILLIAM CLARIDGE and REGINALD EMPSON MIDDLETON, of
35, Parliament, Street, Westminster, S. W., Engineers, 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 :-
Our object is to make certain improvements in the Tyler & Ellis square drilling 5
machine patented No. 3850/90 by which the mechanism shall be simplified and more.
certain and accurate work performed.
Our improvements consist :-
First in an arrangement of the templates or gauges which regulate the shape of
the holes to be drilled, by which a positive action is obtained.
Second in the introduction of an arrangement by which these templates or gauges
may at any time be put out of gear and the spindle brought to a central position for
drilling round holes."
Third in the arrangement by which the size of the hole to be drilled may be
regulated by the adjustment of either of the bearings on the main head with relation
to one another.
Fourth in the employment of a solid spindle which simplifies and cheapens the
construction of the machine (though an inner spindle with sleeve may be used if
preferred) and in the shape of the tool socket.
Fifth in the arrangement of the driving gear at the ball bearing which is the
position of greatest strength.
Sixth in the application of an indicator-by-which-the-movement of one or other
of the bearings on the main head, or of the spindle in its sleeve, or both, shall
register the dimensions of the-holes-to-be-drilled, ou a suitable index.
1
With the aid of the accompanying drawings we will now proceed to explain in 2
detail our methods of carrying out our various improvements.
Figure 1 is a sectional clevation of the moveable headstock.
Figures 2, 3 & 4 are sections on the lines 1-2, 3-4, 5-6 on Figure 1
respectively.
Figures 5 & 6 are sectional plans of the tool holder.
Figure is an elevation, half-in-section-of the moveable head showing a sleeve
on the spindle & a size indicator.
Figure 8 is a side elevation of said indicator and
Figure 9 is a plan of the main head.
Similar letters refer to similar parts throughout. Referring now to our first
improvement, in the Tyler & Ellis machine the roller on the spindle or its sleeve
is kept in contact with the cam or template which regulates the shape of the holes
to be drilled by means of springs which are liable to act intermittently or irregularly,
now we substitute for these springs a second cam or template A. struck to such
dimensions that a line drawn from the face of A though the centre of the spindle D
to the face of the cam or template-B-(which-is-similar-to-the-one-employed in the
Tyler & Ellis machine) shall always be the same length, and thus the rollers A
and B working on the cams A and B respectively and upon opposite sides of the
spindle D are constantly maintained in contact, by each other; thus all irregularity
of motion is avoided and a positive action secured the roller A¹ may if desired be
fitted with a spring to act as a cushion and prevent any jarr.
Referring now to our second improvement, we employ a lever E hinged at E¹ and
provided with pins or studs E³ which pass through the outer casing M to a revolving
collar or clutch F to which the roller A' is attached or connected. This clutch F
allows the spindle D lateral play in one direction only and at one side it is provided
with a conical surface as shown. The action is as follows, when it is desired to
bring the spindle D into its central position the lever E is moved so that by means

page_text: of the studs E2 and clutch F the roller A' is freed from the face of the cam A, thus
D is left free (the roller B¹ freeing itself from the cam B) at the same time the
conical face of F comes into contact with the coned part I of the spindle D and
thus D is brought to a central position and retained there so long as the lever E
remains stationary, thus circular holes may be drilled by the machine by simply
throwing the roller A¹ out of contact with its cam or gauge A.
We would not have it understood that we confine ourselves to the use of the
lever E for throwing the roller A' off its cam, or to the use of the parts F & I as
shown as any other suitable mechanism may be employed.
Our third improvement consists in the employment of a sliding bracket D² for
carrying the ball bearing D' which is thus made capable of adjustment upon the
main head D³ and which when moved by the screw D upon the main head varies
the size of hole to be drilled. If preferred the part of the head M Figure 1 may
be made to slide and the other part D² be fixed. The same length of spindle may
thus always be used and the work operated upon by moving D³. By this arrange-
ment we obtain double the range of sizes. that can be drilled by one and the same
machine for the same movement of either bearing.
Our fourth improvement consists in the employment of a solid spindle D and in
the form of socket an arrangement of which we illustrate in plan in Figures 5
and 6 for the reception of the tools. When (as is usual) we are drilling holes to
template fitted as described in the first improvement, we may if desired make use
of a filling in piece G see Figure 5, H being the tool & H' the screw which secures
it in place, the side cutting edge of the tool being thus kept in the centre line of the
spindle; but when the spindle is in a central position for drilling round holes sec
Figure 6, we may dispense with G and the stud or screw H' is then screwed up
so as to grip the tool H as shown; if the socket be square the stud H¹ is not
required.
:
Our fifth improvement consists in the arrangement of the driving gear J. Ji
which we place at the ball bearing D'. The main driving shaft L is provided
with a keyway for the feather on the wheel J¹ which slides along the shaft L and
is thus connected with it in the usual way: the wheel J may be secured by a
circular feather K2 to the ball and a tapered split circular wedge K screwed at
one end and fitted with a nut K may be employed to secure the ball to the
spindle D with the assistance of the keys K³. In setting the machine for work
we first adjust the position of the ball bearing as required to gauge or otherwise
and afterwards tighten up the nut K' thus securing a rigid and firm hold upon
the spindle D. By this arrangement we secure the advantage of driving the
machine from the nearest possible point to the work and therefore in the strongest
position.
Our sixth improvement is shown more clearly on Sheet 3 of the drawings
Figures 7, 8 & 9 which show an arrangement in which both the spindle and head
are movable and to which an index or gauge is applied, a somewhat similar
index can be applied to the other arrangements exemplified. In this arrangement
the ball bearing D' is solid with the main head D³ and the bearing M which
carries the templates or cams is made to slide upon the head. In Figure 7 the
bearing M is shown at or near the nearest point to D' and it will be evident that
a sleeve N is necessary in order that the bearing M may be moved without moving
the ball bearing. The screw D₁ actuated by the handle D' moves the bearing M
either way and a steel cord Q carried over the pulleys O. and P to a suitable
index R will register the sizes required according to the position of M., further,
if motion is to be given to the spindle D this may be done by the employment
of wheels S S', S being attached when so desired to the screw D, and S¹
revolving upon the collar S2 of the ball bearing beyond which it is screwed and
engages with the screwed part of D; then the motion given to D by turning
the handle D will move the bearing M and the spindle D and thus a combined
motion is obtained, and the index R must be adjusted accordingly. It will be
evident that when the arrangement shown on Figure 1. is employed that if a

page_text: cord Q is attached to the bearing D² & connected to a suitable index the
same result will be obtained, in all cases the distance from the cutting point of
the tool to the centre of the ball bearing being fixed. An index may also be
applied to the Tyler & Ellis machine. It will be noticed that our drawings
represent nachines in a vertical position but it is to be understood that they may
be arranged vertically, horizontally or at any desired angle.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is :-
1st. In a machine for drilling square and other shaped holes and for analogous
purposes the use of a second cam or template substantially as shown and for the
purposes described.
2nd. In a machine such as described in Claim one the arrangement for liberating
the drilling spindle D from the gauges or templates A and B and for bringing it
to a central position by one movement of a lever substantially as and for the
purposes described.
3rd. In machines such as described the use of a movable bearing upon the main
head substantially as shown and for the purposes described.
4th. In machines such as described the employment of a solid spindle with tool
socket substantially as described.
5th. In machines such as described. the driving gear arranged as described and
:shown.
6th. In a machine for drilling square and other shaped holes and for analogous
purposes the arrangements for the combined movements of head and spindle and
for indexing the sizes of the holes to be drilled substantially as described and
shown:
Dated this Ninth day of March 1891.
JAMES WILLIAM CLARIDGE.
REGINALD EMPSON MIDDLETON:
A. H. Reed,
Agent for Applicants.