Improvements in Drilling Machines.
Year: 1894

page_text: Date of Application, 21st May, 1894
Complete Specification Left, 21st Feb., 1895-Accepted. 30th Mar., 1895
PROVISIONAL SPECIFICATION.
Improvements in Drilling Machines.
I, ARTHUR ALBERT TATTERSALL, of Mill Hill Tool Works, Mill Hill,
Blackburn, Lancashire, Manufacturer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to drilling machines.
In carrying out my invention under one arrangement for vertical drilling
machines construct a frame having a vertical pillar on its underside on which a
swivelling table, which is capable of being raised and lowered to suit the work, is
adjustably fitted.
Carried by the frame is a wheel which has bevel teeth on its outer circumference
and spur teeth on its inner circumference. This wheel, which is driven by a slotted
and adjustable handle, is so arranged and fitted that its outer bevel teeth mesh
with the teeth of a bevel wheel which is carried on the drill spindle and rotates the
drill, and its inner spur teeth mesh with and rotate a small pinion wheel fixed on
the inner end of a cross shaft or spindle on the outer end of which a fly wheel is
fitted.
The whole arrangement is such that the turning of the driving wheel
simultaneously rotates both the drill and the fly wheel. The fly wheel stores up
power and ensures steady running for small drills.
The drill is operated as herein before described for single gear but for double
gear the speed is reduced and power gained by making the fly wheel the driving
wheel and turning it by a suitable handle.
The feed which is put on by a screw, is, preferably regulated and made self-
acting, by means of a small feed wheel or roller which runs on an eccentric surface
cast on the bevel driving wheel. This feed wheel is carried on a spindle which can
be moved, in order to regulate the feed, along a slot in a lever, which, by suitable
connections, is made to turn the feed screw. The arrangement is such that every
time the eccentric surface on the bevel wheel lifts up the feed wheel the feed screw
is caused to partially turn and put on the feed. According as the feed wheel
spindle is shifted up or down the slotted lever the feed is increased or diminished.
Speeds may be introduced, if so desired, on the bevel wheel and fly wheel
shaft.
This arrangement can with equal advantage be applied to bench and like
drills.
Instead of the usual and to a certain extent unsatisfactory methods of making
and fitting drill spindles I prefer to use two flanges or face plates one of which if
so desired may be made solid with the drill spindle or he bolted or otherwise
secured thereto. The two flanges or face plates, the lower one of which is,
preferably, larger than the other and is movable, are secured together in any
suitable manner. The top flange or face plate chuck is so fitted as to always run
true with the drill spindle, whilst the lower plate, to which the drill is secured, can
be easily shilted if necessary to set the drill point exactly true. It is not of
material moment, in ordinary drills, whether the drill shank is true or not so long
as the drill point works true.
Another feature of my invention is applicable to power drilling machines. It is
usual with these machines to drive them, at one speed, direct from the main shaft,

page_text: by means of fast and loose pulleys on the drill, or indirectly, at differential speeds,
by using stepped pulleys and a countershaft.
Under this invention, I drive the drill at differential speeds direct from the main
shafting and thereby obviate the use of countershafts, extra straps, etc. To effect
this, I use a stepped pulley or cone which is loose on the driving shaft of the drill
and is driven constantly by means of a strap from the main shaft. The stepped
pulley, which may have two or more speeds, is hollow and internally tapered at one
end and into this tapered part a correspondingly coned or tapered part or flange on
a clutch box fits. This clutch box which is feathered to the driving shaft of the
drill can be moved back and forward on said shaft, so as to throw the stepped
pulley into and out of gear by means of a lever in the usual way. The arrangement
is such that when the lever is moved in one direction the clutch is also moved
along the drill shaft and its tapered flange comes into frictional contact with the
inner tapered part of the stepped pulley; as a consequence the clutch and drill
spindle is caused to revolve. When the lever is moved in the opposite direction
the clutch is moved out of contact with the stepped pulley and as a consequence
the drill is stopped. As the clutch is driven by friction it will give way when
the drill suddenly jerks or is caught when passing through a hole etc.
Datel this task 1.
CXL
H. D. FITZPATRICK,
70, Wellington Street, Glasgow, Agent.
I, ARTHUR ALBERT TATTERSALL, of Mill Hill Tool Works, Mill Hill,
Blackburn, Lancashire, Manufacturer, do hereby declare the nature of this inven-
tion 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 drilling machines and it has for its object to improve
their construction.
And in order that my said invention may be properly understood I have hereunto
appended an explanatory sheet of drawings, whereon,
Fig. 1 is a front view partly in section of a vertical hand drill.
Fig. 2 is a side view of the same.
Fig. 2 is a detail plan view.
Fig. 3 is a side view of a power drill.
Fig. 4 is an enlarged view partly in section of part of the same.
Fig. 5 shows, in front view, a modified construction of the drill chuck Figs. 1
and 2.
Fig. 6 is a plan view of the chuck face-plates.
Fig. 7 is a detail sectional view.
Referring to the drawings whereon the same reference numerals wherever
repeated indicate the same or similar parts.
The vertical drilling machine Figs. 1 and 2 consists of a frame 1 which can be
bolted in any suitable position and which is provided with a removable vertical
pillar 2 at its underside. Fitted on tlie pillar is a forked support 3 which can be 4
adjusted at any desired height on the pillar 2, so as to suit the work, by means of
the bolts 4 and strap piece 5. 6 are the prongs of the forked support. Secured
adjustably to the top of the support by means of the bolt 7 and butterfly nut 8 is a
swivelling table 9. Whenever desired the forked support may be used for the
work and the swivelling table turned round out of the way.
5
Carried by the frame 1 is a wheel 10 which has bevel teeth 11 on its outer

page_text: circumference and spur teeth 12 on its inner circumference. This wheel which is
driven by a slotted and adjustable handle 13, is so fitted, as shown, that its outer
bevel teeth mesh with the teeth of a bevel wheel 13 feathered to and rotating the
drill spindle 14, whilst its inner spur teeth 12 mesh with and rotate a small pinion
wheel 15 fixed on the inner end of a cross shaft 16. carrying the fly wheel 17.
With this arrangement, as will be readily seen, when the driving wheel 10 is
turned by the handle 13 the drill and the fly wheel are simultaneously rotated.
The fly wheel stores up power and insures steady running for smail drills.
The drill is operated as hereinbefore described for single gear but for double
gear the speed is reduced and power gained by making the fly wheel the driving
wheel and turning it by the handle 18.
The feed which is put on by the screw 19, is regulated and made self acting, by
means of a small feed wheel or roller 20 which runs on the eccentric surface 21
cast on the driving wheel 10. This feed wheel 20 is carried ou a short spindle 22
which can be moved, in order to regulate the feed, along a slot 23 in a bent
lever 24 which works on a pivot 25 secured to the projection 26 of the frame.
Secured to the upper end of the lever is a pawl 27" which works in ratchet
teeth 27 cut, as shown at Fig. 2, in the inside of the hand wheel 27 secured to the
top of the feed screw 19. The arrangement is such that every time the eccentric
surface 21 on the wheel 10 lifts up the feed wheel 20 the feed pawl 27" is caused to
move the wheel 27 which turns, like a nut, on the top of the feed screw 19 (see
Fig. 7) thereby pushing the latter, along with the drill spindle which is coupled to
it by the socket coupling 45, downward and putting on the feed. The pin 19*
which is fitted in the screw 19 and works in a vertical slot 19h made in the frame
prevents the feed screw 19 turning along with the nut or wheel 27.
According as the feed wheel spindle 22 is shifted up or down the slotted lever 24
the pawl 26 is caused to move over one or more of the ratchet teeth. 27" and
thereby increase or diminish the feed.
As will be seen from Fig. 7 the socket coupling 45 enables the drill spindle 14 to
be revolved by the action of the gear wheels 10 and 13 independently of the feed
screw 19.
When it is desired to pull up the spindle 14 all that is necessary is to turn back
the wheel 27 by hand whereupon the feed screw 19 and with it the spindle 14 is
raised.
This arrangement can with equal advantage be applied to bench and like
drills.
Instead of the usual and to a certain extent unsatisfactory method of inaking
and fitting drill spindles I prefer to use two flanges or face plates 28. 29 one of
which, if so desired, may, as shown at Figs. 1 and 2. be made solid with the drill
spindle; or as shown at Fig. 5 it may be provided with a shank 30 which fits into
the drill spindle and is secured thereto by a pinching pin 31. These two flauges
or face plates 28, 29, the lower one, 29, of which is preferably larger than the
other and is movable, are secured together in any suitable manner, but preferably
by means of bolts 32 passed through slots 33, 34 cut at right angles to each other,
the slots 33 being in the upper plate and the slots 34 in the lower one. The
top flange or face-plate chuck 28 is so fitted as to always run true with the drill
spindle, whilst the lower plate 29, to which the drill is secured, can be easily shifted
by Inosening the bolts 32 to set the drill point exactly true should it be necessary
to do so.
It is not of material moment in ordinary drills whether the drill shank
is true or not so long as the drill point works true.
Another feature of my invention is applicable to power drilling machines. It is
usual with these machines to drive them at one speed, direct from the main shaft,
by means of fast and loose pulleys on the drill, or indirectly, at differential
speeds, by using stepped pulleys and a counter shaft. Under this invention I drive
the drill at differential speeds direct from the main shafting and thereby obviate
the use of counter shafts, extra straps, etc. To effect this I use a stepped pulley
or cone such as 40 (Figs. 3 and 4) which runs loose on the driving shaft of the

page_text: drill and is driven constantly by means of a strap from the main shaft. This
stepped pulley which may have two or more speeds, is hollow and internally
tapered at one end and into this tapered part a correspondingly coned or tapered
part or flange 41 on a clutch box 42 fits. This clutch box which is feathered to
the driving shaft of the drill can be moved back and forward on said shaft so as
to throw the stepped pulley into and out of gear by means of a lever 43 in the
usual way. The arrangement is such that when the lever is moved in one direction
the clutch is also moved along the drill shaft and its tapered flange comes into
frictional contact with the inner tapered part of the stepped pulley;
consequence the clutch and drill spindle is caused to revolve. When the lever is
moved in the opposite direction the clutch is moved out of contact with the stepped
pulley, and, as a consequence, the drill is stopped, As the clutch is driven by
friction it will give way when the drill suddenly jerks or is caught when passing
through a hole, etc.
as a
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.. A drilling machine constructed, arranged, and operating, substantially as
hereinbefore described with reference to Figs. 1 and 2 of the drawings.annexed.
2. In drilling machines the combination with a face plate made one with or
secured to the drill spindle of a second drill holding face plate or chuck which
can be readily moved in order to set the drill true, substantially as hereinbefore
set forth.
3. For power drilling machines the arrangement of stepped pulley and sliding
clutch box substantially as herein before described with reference to Figs. 3 and 4
off the drawings annexed and for the advantages set forth.
Dated this 20th day of February 1895.
H. D. FITZPATRICK,
70, Wellington Street, Glasgow, Agent.