Improvements in Machines for Slot-drilling Keyseats, Featherways, Cottar-holes, Cutter-holes, and like Work.
Year: 1895

page_text: Date of Application, 6th Apr., 1895
Complete Specification Left, 6th Jan., 1896-Accepted, 8th Feb., 1896.
PROVISIONAL SPECIFICATION.
Improvements in Machines for Slot-drilling Keyseats, Featherways,
Cottar-holes, Cutter-holes, and like Work.
I, JOHN COLLINSON HARRISON, of Stoney Cottage, Bowness-on-Windermere,
in the County of Westmoreland, Mechanical Engineer, do hereby declare the
nature of this invention to be as follows:-
This invention has for its object improvements in machines for slot-drilling key-
seats, feather-ways, cottar-holes, cutter-holes etc.
For this purpose I use two drills at once for certain work, & in the following
manner.
When drilling cottar and cutter-holes or any slot that is to go through the piece
of work to be operated upon I start with a drill at each side at once, joining in the
middle or somewhere between the starting points.
When drilling keyseats, featherways etc., two seats (one at each side of the work
if so placed) can be done at the same time.
When drilling one key-seat or featherway, one drill only is used.
The work to be operated upon in this machine is held between centres or clamped
upon adjustable blocks or supports, which are mounted upon the bed of the
machine.
The drilling apparatus proper, slides to and fro on the bed between the centres
or supports, underneath the work, being traversed the required distance by a crank
with adjustable stroke, fixed at one end of the bed.
The drilling apparatus consists of a suitable carriage or saddle with a trunnion
at one end of its upper surface, and upon which is supported & hinged a double
drilling-head having two spindles, one at each side of the work to be operated
upon. The two spindles are fed automatically toward each other, but withdrawn
by hand.
The double drilling-head, when drilling cottar-holes or any through slot having
taper makes a short radial osscillation (with trunnion as centre) sufficient to give
the required taper, during each stroke of the saddle. The osscillating movement
is also performed and regulated by an adjustable crank & is only used when
drilling cottar or cutter-holes or other tapered slots..
The two cranks are driven by suitable worm or other gear & can be worked
independently of each other.
The two drilling spindles are driven by suitable mitre and spur gear from a belt.
driven shaft which runs along one side of the bed; the traverse of the saddle being
accommodated by a sliding key.
The direction of rotation of the two spindles is that one drives a right-handed
drill and the other a left-handed one, both making the same number of revolutions.
The form of the drills used, and the relative positions of the cutting edges of one
drill to those of the other as regards rotation, are such that when joining the slot
they may overlap each other without fouling.
The saddle is connected to the first mentioned crank by a nut through which
passes a screw running along the centre of the bed; this is secured endwise (but
left free to revolve) in a suitable crosshead which engages the pin of the crank.
The end of the screw opposite to the crosshead, has a parallel hole & key-way
extending into it for some distance & fits on to a reversable belt driven shaft at

page_text: the other end of the bed. When traversing the saddle by the crank, the screw
does not revolve, acting merely as a connecting-rod; a handle is however
provided to turn the screw, and so bring the saddle into any required position on
the bed.
When it is required to drill featherways, key-seats etc. longer than the full
stroke of the crank, it is thrown out of gear; the saddle being then traversed by
the screw revolving in either direction by the before mentioned reversable belt
driven shaft.
Two travelling stays may be provided for operating on slender work; they may
secured to the saddle & one or both may be used at once.
A pump may also be provided to supply the soapsuds or other liquid to the
drills.
Dated this Fourth day of April 1895
Improvements in Machines for Slot-drilling Keyseats, Featherways,
Cottar-holes, Cutter-holes, and like Work.
I, JOHN COLLINSON HARRISON, of Bowness-on-Windermere, in the County of
Westmoreland, 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 that class of machine in which key-seats, feather-
ways, cotter holes, cutter holes and similar slots in shafts are cut by rotating
drills travelling to and fro from end to end of the slot, and is designed to
provide a machine in which the work is held centrally and can be done more
expeditiously and by which the holes or slots can be cut at any desired angle.
It consists essentially in constructing the machine with a drilling head, mounted
upon a traversing saddle provided with two rotating spindles placed opposite to
each other so that they may operate at different sides of the work and pivoted
upon a trunnion at one end of the saddle upon which it is oscillated by a crank to
give the desired inclination to the slot the saddle and drilling head being moved to
and fro to traverse the work by crank or crank pin with an adjustable stroke
working in a cross-head, connected thereto by a screw or otherwise and the
work being held stationary by centres carried in headstocks or brackets affixed to
the bed.
.
The invention will be fully. described with reference to the accompanying
drawings.
Fig. 1. Plan.
Fig. 2. Sectional plan...
Fig. 3. Longitudinal sectional elevation..
Fig. 4. End elevation (enlarged scale).
:
Fig. 5. Transverse section through tool holder and saddle (enlarged scale).
Fig. 6. Transverse section through the cross-head on line y-y Fig. 3.
Fig. 7. Sectional elevation through tool holder and saddle on line x-x Fig. 5.
Fig. 8. End elevation of tool holder and saddle from the back.
The drilling head A and sliding or movable saddle B are carried by or mounted
on a bed C upon which they are traversed backwards and forwards by a crank N
with adjustable stroke the bed C being supported by suitable framework not shown
in the drawings.
The sliding saddle B which rests upon and moves to and fro over the bed C has
pivoted upon its upper surface the drilling head A. The drilling head is pivoted
on the trunnion & placed at one end and is capable of oscillating to one side or the

page_text: other. The drilling head is provided with two drills E and F placed in the same.
plane at opposite sides of the centre so that a cotter or cutter hole may be drilled
with two drills simultaneously from opposite sides. The drill spindles E' and Fi
are mounted in journals and are driven by suitable mitre and spur gear e and f
from the belt driven shaft G which runs along one side of the bed C the traverse.
of the saddle being accommodated by a sliding key 9 in the wheel gl and slot g" in
the shaft. The drill E is a right hand drill and the drill F a left hand one and
are preferably set with their respective cutting edges at right angles to each other
When
so that they may overlap each other without fouling when joining the hole.
not requiring to drill a hole right through or a key-way on either side of the shaft.
either drill may he removed from its spindle and the other used without it.
The radial oscillation or movement of the drilling head A is transmitted to it by
the crank H the pin h of which is adjustable to vary the throw of the crank and
the consequent movement of drill head. The crank block h' works between the
two planed faces of the slot H. The crank is driven by the worm J on the
shaft Jengaging with the worm wheel; on the end of the crank spindle. The
worm wheel is secured to the spindle by a tapered pin passing through it, which.
can be removed when it is not desired to rotate the crank and passed through a
hole in the casting into the crank spindle. This is done when it is required to
work the drilling head without oscillation for ordinary key-ways, the oscillating
movement being required to cut tapered holes or slots. The amount of oscillation
or movement given to the drill head is regulated according to the amount of taper
required in the slot or hole.
When the apparatus is working the drills E and F are each fed forward
automatically by a ratchet wheel K which is rotated about a screw & connected to
the end of the drill spindle. Motion is transmitted from projection or cam L on.
the face of the worm wheel j by means of an upright pin or rod which is moved
up and down in a hole in the saddle casting and the upper end of which engages
with a lever or tappet on a tappet shaft M. The tappet shaft M passes right.
through the lower side of the drill head A projecting at either end. On the ends
of the tappet shaft M are placed the levers m which through the connecting
rods m' actuate the pawls k pivoted to the oscillating levers m".
The reciprocating traverse movement is imparted to the drill head A aud
saddle B by the adjustable crank N at one end of the bed. The crank pin n is
adjustably attached to the disc which carries it by a screw n' so that the throw of
the crank can be readily either lengthened or shortened to correspond with the
length of slot to be cut. The crank block o works in a slot in the cross head O.
The crank is actuated by the worm R on the shaft J' gearing with the worm.
wheel the crank being connected to the worm wheel by the pin which can be
removed when it is desired to throw the crank out of gear. The worm R and the
worm J being on the same shaft the movement of the two cranks H and N are
made to correspond, so that the oscillation of the.drill head in one direction or the
other corresponds with the traverse of the saddle. The shaft J' is driven by a.
strap or cord onto a stepped pulley J" placed on or geared to the end.
The cross head O is connected to the saddle B by a screw P passing through a
nut or screwed bracket on the underside of the saddle. The end of the screw P
is connected to the cross head O so as to allow it to rotate independently of the-
reciprocating movement of the cross head. At the other end of the screw P it is
connected to a strap driven shaft p which projects up into the interior of the screw
to allow of the traverse of the screw by the crank N the end of the screw being
provided with a parallel hole and key way extending into it for some distance..
When it is desired to make a slot longer than the movement of the crank it is
thrown out of gear by removing the pin and the saddle B and drill head A can
The shaft is
be traversed nearly the full length of the bed C by the screw P.
fitted with three strap pulleys and suitable gearing to give a reversing and stopping
motion. A handle is provided to turn the screw to bring the drill head and saddle-
into any desired position along the length of the bed.
P

page_text: Upon the bed C of the machine are placed two movable headstocks or
brackets S, S¹ provided with centres s, s¹ between which the work W is held.
The headstocks or brackets may be clamped to the bed C in any desired position.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
1. A slot-drilling machine constructed with a double drilling head with two drill
spindles operating in opposite directions upon the work and sliding to and fro over
a horizontal bed upon which the work is supported by headstocks or otherwise
substantially as described.
2. A slot drilling machine constructed with a drilling head mounted upon a
sliding saddle and capable of a radial oscillation or movement thereon to give a
taper to the hole that is being cut while the saddle traverses to and fro on
a horizontal bed substantially as described.
3. In a slot drilling machine the combination with the saddle or drill head of a
screw connected thereto by a nut and running longitudinally of the machine
attached at one end to a cross head actuated by a crank and at the other with a
reversible belt driven shaft whereby the screw may receive either a reciprocating
rectilinear movement or an angular movement to cause the drill to traverse
backwards and forwards substantially as described.
4. A drill bead and saddle for slot drilling machines constructed and arranged in
combination substantially as and for the purposes described and shown.
5. A slot drilling machine having the several parts constructed and arranged in
combination substantially as described and shown.
Dated this 19th day of December 1895.
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.