IMPROVEMENTS IN SLOT DRILLING MACHINES
Year: 1879

page_text: LETTERS PATENT to Alexander Carnegie Kirk, of Glasgow, in the County of
Lanark, North Britain, for the Invention of "IMPROVEMENTS IN SLOT DRILLING
MACHINES."
Sealed the 6th January 1880, and dated the 15th July 1879.
PROVISIONAL SPECIFICATION left by the said Alexander Carnegie Kirk
at the Office of the Commissioners of Patents on the 15th July 1879.
ALEXANDER CARNEGIE KIRK, of Glasgow, in the County of Lanark, North
Britain. "IMPROVEMENTS IN SLOT DRILLING MACHINES."
This Invention has for its object the constructing of slot drilling machines in an
improved manner, and so as to save time and labor, the improvements being very
advantageously applicable in cases in which numerous slots have to be drilled, or
mortises formed in one piece of wood or other material, as for example in side
frames for holding Venetian slats.
In a machine fitted with the improvements the drill spindle is by preference
vertical, and is held and driven in any convenient way, being raised and lowered by
means of a hand lever, and the depth of cut being determined by an adjustable stop.
On a table or bracket forming part of the machine, or on a bench or table on which
the bracket or frame piece carrying the drill spindle is fixed, there is placed a saddle,
which may be of wood or metal, and which is capable of horizontal movement on
its support. The saddle is made with a horizontal guide groove in which there is
fitted to move a slide or carriage which is formed with a groove or seat for holding
the frame piece or other piece in which the slots or mortises are to be drilled, and
The slide
clamping screws are provided for securing the frame piece in its holder.
is made with a row of notches or holes pitched at the same distances apart as the
slots or mortises require to be, and a pin carried by the saddle projects up into one
of these notches or holes at the time when a slot or mortise is being drilled. The pin
of the saddle is capable of being depressed below the slide, there being a spring
applied to it to raise it again. A hand lever centered on a swivel or universal joint
lies above the slide or carriage, and has a pin projecting from its under side in a
position admitting of its being entered into one of the holes or notches of the slide.
In order to shift the slide between each drilling operation the hand lever is moved
DC77

page_text: so as to enter its pin in the hole or notch of the slide into which the saddle pin is
projecting, and so as to depress the saddle pin. The hand lever is then moved
horizontally to shift the slide, and on-the-next-notch or hole coming over the saddle
pin that pin springs up into it and stops the movement. The movement for
producing the elongated or slot form during the drilling operation is imparted to the
saddle-which is guided in a suitable manner, stops being provided to determine the
length of the slot or mortise. When making a row of mortises to receive the ends
of Venetian-slats these mortises have to be inclined, those of some frame pieces in
one direction, those of others in the reverse direction, and in a very simple_and_
[convenient arrangement for guiding the saddle to suit this application. The saddle
is centered on a vertical pin entered down into a socket in the bench or support,
the pin being at such a distance from the drill spindle relatively to the length of
mortise that the slight curvature due to the angular movement on the pin is not
objectionable. The saddle and bench are provided with two centres for giving the
requisite reversed inclinations to the mortises or slots, and the centre pin is movable
so that it can be placed in either centre.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by.
the said Alexander Carnegie Kirk in the Great Seal Patent Office on the
12th January 1880..
ALEXANDER CARNEGIE KIRK, of Glasgow, in the County of Lanark, North
"IMPROVEMENTS IN SLOT DRILLING MACHINES."
Britain.
My said Invention has for its object the constructing of slot drilling machines in
an improved manner, and so as to save time and labor, the improvements being
very advantageously applicable in cases in which numerous slots have to be drilled,
or mortises formed in one piece of wood or other material, as for example in side.
frames for holding Venetian slats.
And in order that my said Invention may be readily understood and carried into '
effect, I proceed to particularly describe a slot drilling machine made with my
improvements, and represented on an accompanying Sheet of explanatory Drawings,
the various parts being distinguished by reference numerals which are the same for
the same or like parts wherever they are repeated.
'
Figures 1, 2, 3, on the accompany Sheet of Drawings are a front elevation, a
sectional side elevation, and a sectional plan of the slot drilling machine, and Figure 4
is an enlarged vertical sectional view of a detail. The drill spindle 5, which is by.
preference vertical, may be driven in any convenient way, but is represented as held'
in two plain bearings 6, 7, in a bracket-shaped casting 8 which is also formed with
an arm 9 carrying a horizontal first-motion spindle 10. This spindle 10 has on it
fast-and-loose pulleys 11 for a driving belt, and also a grooved pulley 12 to receive
an endless cord by which motion is transmitted to a grooved pulley 13 fixed
on the upper end of the drill spindle 5. The drill spindle 5 is connected to a
counterweighted lever 14, which is connected by a link 15 to a hand lever 16
to be moved by the attendant worker for lowering and raising the drill, the
depth of cut being determined by an adjustable stop. On a bench or table 17
on which the bracket 8, 9, is fixed there is placed a board or plate 18, and upon
this there is set a saddle or movable board 19 which may be of wood or metal, and
which is capable of horizontal movement on its support 18. The saddle 19 is
formed or fitted with V-guides 20, brtween which there is fitted to move a slide or
carriage 21 which is made with a seat for holding the frame piece 22 or other piece
in which the slots or mortises are to be drilled, and clamping screws 23 are provided
for securing the frame piece 22 in its holder or slide 21, these screws being titted to
metal clamps fixed in the slide 21 at suitable points. The slide 21 is made with a
series of notches 24 along its inner edge, or it might be made with a row of holes,
the notches or holes being pitched at the same distances apart as the slots or mortises
require to be, and a pin 25 carried by the saddle 19 projects up into one of these
notches or holes 24 at the time when a slot or mortise is being drilled. The pin 25
is capable of being depressed below the part of the slide 21 having the holes or
notches 24, there being a spring applied to it to raise it again in a manner best seen
in Figure 4. A hand lever 26 centered on a swivel or universal joint 27 lies above
the slide or carriage 21, and has a pin 28 projecting from its under side in a position
admitting of its being entered into one of the holes or notches 24 of the slide 21.
In order to shift the slide 21 between each drilling operation the hand lever 26 is
moved so as to enter its pin 28 into that hole or notch 24 of the slide in which the
saddle pin 25 is projecting, and so as to depress the saddle pin 25. The hand lever
26 is then moved horizontally to shift the slide 21, and on the next notch or
hole 24 coming over the saddle pin 25 that pin springs up into it and arrests the
movement.
The movement for producing the elongated or slot form during the drilling
operation is imparted to the saddle 19 by means of a handle 29, the saddle being
guided in any suitable manner, and adjustable stops 30 being provided to determine
the length of the slot or mortise. When making a row of mortises to receive the ends

page_text: of Venetian slats these mortises have to be inclined, those of some frame pieces in
one direction, and those of others in the reverse direction; and in a simple and
convenient arrangement for guiding the saddle to suit this application, and which is
the arrangement shown on the accompanying Drawings, the saddle-19-is-centered-
Con a vertical-pin 31 entered down into a socket in the bench or support 17, the
-pin-31-being-at-such a distance from the drill spindle relatively to the length of
-mortise-or-slot-that the slight curvature due to the angular movement on the pin 31
is not objectionable. The saddle 19, and the bench 17, and board 18 are provided
with two centres-31,-32, for-giving-the requisite reversed inclinations to the mortises
or slots, and the centre pin is movable so that it can be placed in either centre.
Having thus particularly described my said Invention, and the manner of
performing the same, I have to state that I do not restrict myself to the precise
details herein described or delineated, but that what I believe to be novel and
original, and claim as the Invention secured to me by and in terms of the herein-
before in part recited Letters Patent is,-
1. The arranging or combining together of the parts of slot drilling machine
substantially in the improved manner herein before described.
2. The hereinbefore described arrangements for regulating the step by step shifts
of the slide (21) carrying the piece to be operated on.
3. The arrangement of the saddle (21) so as to be movable horizontally about one
or other of two centres for giving reversed inclinations to the slots or mortises as
herein before described.
4. The combination of arrangements whereby the saddle (19) is moved to produce
the elongated or slot form, and the slide is moved on the saddle to obtain the
successive positions.
In witness whereof, I, the said Alexander Carnegie Kirk, have hereunto set
my hand and seal, this Tenth day of January, in the year of our Lord
One thousand eight hundred and eighty.
ויזזד--
VIDHY