Improvements in and connected with Power Drilling Machines.
Year: 1893

page_text: COMPLETE SPECIFICATION.
Improvements in and connected with Power Drilling Machines.
I, DAVID KIEL TULLIS, of Old Edinburgh Road, Glasgow, 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 :-
This invention relates to portable drilling machines and it has mainly for its
object to so construct the drill that it can be worked, in an improved manner, by
power instead of by hand.
The improved drill is specially designed to supplant the ordinary hand ratchet
drill.
And in order that my said invention may be properly understood I have hereunto
appended two explanatory sheets of drawings, whereon,
Fig. 1 is a side elevation of the drill.
Fig. 2 is a vertical section.
Figs. 2, 3, 4, 5, and 6 are detail views.
Fig. 7 is a side elevation and Fig. 8 a plan of a jib.
Fig. 9 is a cross section on the line a-x Fig. 7.
Fig. 10 shows another form of jib.
Referring to the drawings whereon the same reference letters wherever repeated
indicate the same or similar parts.
The spindle a of the drill, which is, preferably, bored at both ends as indicated
in dotted lines to suit different sizes of twist drills, is inserted in the long sleeve b
screwed externally at U. The spindle is clamped to the sleeve by means of a jaw
which is tightened up by means of the stud 3. When the stud is unscrewed
the spindle can be quickly taken out and reversed. The screw b¹ works in an
made in one with
internally threaded cast-iron piece c which has the bevel wheel
at
it. The large bevel wheel e is keyed, at e', to the spindle a, which has a longitudinal
groove a¹ to permit vertical movement.
Fitted on the outside of the sleeve of the bevel wheel e is a hollow piece / open
at each side. g is a hollow stock screwed into the lower end of the piece f. a is
the twist drill.
i is a bent arm which is secured to the outside of the neck of the piece f by a
jaw and clamping stud 2. The upper end of the arm is bored with a horizontal
hole through which passes a horizontal spindle j having a sleeve k on its outside.
The right hand end of the spindle has a bevel pinion pinned to it which meshes
with the bevel wheel d. Keyed to the sleeve k is a bevel pinion ¹ which meshes
with the bevel wheel e.
Keyed to the outer end of the spindle is a cap which has leather and (or)
cardboard washers in it. Screwed on to the end of the sleeve is a disc k² which
is in contact with and normally bears against the leather washer of the cap. m is
a ring which is fitted in a recess made in the rope driving pulley n fitted loose on
the sleeve k. o is a toothed clutch (see Figs. 3 & 4) screwed on the sleeve and
bearing against the arm i its teeth mesh with corresponding teeth on the hub n' of
the pulley n.
pis a spiral spring fitted round the end of the spindle j and held in
position by an adjustable collar on the extremity of said spindle.
is a handle for turning the cap l.
The boss of the armi has a grooves at each side (see Fig. 6) and into these
grooves enter Hanges s' (see Fig. 5) made in a saddle piece which fits on top of
the boss. The saddle piece has at one end a vertical 'flange t' (see Fig. 2) which

page_text: fits in a circular groove n³ (Fig. 3) cut or made in the hub n' of the driving
pulley n. is a pin which is inserted in the boss and projects up through an
oval hole u made in the saddle. Fitted on the pin a lever having an
eccentric head (see Fig. 24) so made that when it is turned in the hole u¹ the
saddle t is caused to slide backward or forward, the grooves s acting as guides.
When it is desired to use the drill the piece is inserted into the carriage w
(see Figs. 7, 8 and 9) which can be travelled, by means of the screw spindle w',
(passing through nut w¹), back and forward in the forked arm or jib w³, fitted
adjustably on the pillar. The jib has a radial movement round the pillar, and
is clamped in any desired position by the clamping screws. The pillar is secured
to the work by means of a sole plate having bolt or screw holes ³. is an
adjustable collar.
The travelling carriage can be clamped in position by screw w³ which has a
washer won it bearing against the side of the forked jib (see Fig. 9). to is the
handle of the screw.
w³ is a pap on the carriage w having a tapped hole into
which the screw enters.
The arm of the drill rests on the top of the carriage.
In Fig. 10 a simple and adjustable form of jib is shown consisting of two
bars The stock g of the drill or the part f is inserted in a hole in the head o
of the bar and the end of said bar is inserted in the head of the bar v³.
is a bearing, on the sole plate 2, into which the end of the bar is inserted.
vare pinching screws. The sole plate may be clamped to the work by bolts or
screws.
The feed is operated by the friction clutch 1, spindle j, pinion j', and bevel
wheel d with its sleeve c which screws the spindle a and sleeve b up and down.
When the drill is in operation the disc k bearing against the leather washer
and cap 7 turns the latter, (which is keyed by feathers to the spindle j) and.
also the spindle j and pinion and thereby gives a constant and uniform feed.
When the eccentric head of the lever is in the position shown at Figs. 2 & 24
the wheel n is clutched to the sleeve k and the drill and feed mechanism is put in
motion, but, when the head is turned one quarter round, i.e. to a position at right
angles to that shown, it, turning on the pin u, forces the saddle and wheel n far
enough to the left hand to disengage the teeth of the clutch o and stop both the drill
and the feed mechanism. When the eccentric head is turned half round the saddle t
is forced the full limit of its movement towards the left hand and the ring m is
caused to bear against and press back the cap out of frictional contact with the
disc. The friction between the ring m and bevelled edge of cap / causes the cap
and also the spindle j to revolve thereby giving a quick return to the spindle
the clutch o is disengaged and the disc k out of contact with the cap / the sleeve k
and drill remain stationary.
l
a. As
It will be thus seen that the action of the drill can be readily controlled by
merely turning the lever v.
The feed can be regulated or the drill returned by hand, if so desired, by turning
the cap by the handle r.
The friction between the cap and disc is regulated by the spring p and
adjustable collar
9.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I consider novel and desire to claim is :-
1. The general arrangement aud combination of parts of the power drilling
machine, substantially as herein before described with reference to the drawings
annexed.
2. The combination, in a portable power drilling machine, with the driving
wheel, of a friction clutch (l, k) clutch'o and saddle t, moved by eccentric lever v,
for operating said clutches, substantially as hereinbefore described and shown on the
drawings annexed.

page_text: 3. The combination with the drill spindle, of the bevel wheels d, e, pinions j¹, k¹,
spindle and sleeve and the clutch mechanism for operating said spindle and
sleeve, substantially as herein before described with reference to the drawings
annexed.
4. The jib device for the drill, substantially as hercinbefore described and shown
at Figs. 7, 8 and 9 of the drawings annexed.
Dated this 25th day of December 1893.
H. D. FITZPATRICK,
70, Wellington Street, Glasgow, Agent.