Improvements in Machines for Drilling to a Pattern.
Year: 1892

page_text: Date of Application, 4th June, 1892-Accepted, 16th July, 1892
COMPLETE SPECIFICATION.
Improvements in Machines for Drilling to a Pattern.
1, PAUL PRYIBIL of No. 518, West 41st Street in the City of New York,
in the State of New York, United States of America, Machinist, 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:
My invention relates to improvements in machines for drilling to a pattern,
and, while adapted to use in connection with any class of work where it is
desirable to drill a series or group of holes in accordance with a predetermined
pattern, is particularly well adapted for drilling piano plates.
A practical embodiment of my invention is represented in the accompanying
drawings, in which,
Figure 1 represents the machine in front elevation ;
Figure 2 represents the same in side elevation;
Figure 3 is a transverse section through line 2, 2, of Figure 1; and
Figure 4 is a partial vertical central section from front to rear in the line 1, 1,
of Figure 1.
A represents a hanger, or other suitable support, in which the shaft C is
journalled in suitable bearings, and provided with a pulley a for the application
A worm B is fixed to the shaft C,.
of power to the shaft to drive the cutter.
and is made to turn a drill spindle d by means of a feather and groove connection
within the hub of the worm B, which, at the same time, permits the drill spindle
to move up and down within said hub. The shaft d extends down through a
fixed bearing e, and through a sliding bearing f. The spindle is so mounted
within the sliding bearing f, that when the latter moves up and down, it carries.
the spindle d with it, and thereby carries the drill, or other gear attached to the
spindle d, up and down.
The bearing, and the parts connected therewith, are caused to move up and
down as follows:-
The worm B intermeshes with the worm wheel g on the shaft on which is
a pulley h, which, by means of a spindle belt, communicates motion to pulley i,
which latter is fixed to rotate therewith. A worm j intermeshes with a worm
wheel on the shaft of the pinion 1, which latter engages a rack m fixed to the
sliding bearing f.
f
When a rotary motion is imparted to the shaft C, to rotate the cutter in the
direction to cut, it will, at the same time, operate the worm B, and, through
the gear above referred to, will slide the bearing f, and the drill carried thereby,
downwardly into engagement with its work.
The drill is returned, when the feed gear is thrown out of engagement, by
means of a retracting spring r.
!
.
To enable the feed gear to be thrown into and out of engagement, to feed the
drill, the pulley i and the worm jare mounted upon a slide n controlled by a sliding
bar O, provided with an elongated slot o, with which a roller n', attached to the.
slide n, engages. The slot o is bent downwardly, at one end, oblique to the line of
travel of the bar O, so that as the bar O is slid, it will, when the roller n'
reaches the oblique portion of the slot, cause the slide to rise or fall, as the case.
may be.
The sliding bar O also carries a spring arm p, pivotally secured to it at p³, and”
having, at its free end, a rollet p², bearing on a cam F attached to the sliding,
bearing. An adjusting screw S, engaged with a portion of the sliding.bar O, bears
upon the spring arm p, and serves to press it downwardly, and thereby the sliding:

page_text: bearing, and the parts attached thereto, into the proper relation with respect to the
work to be done. The return movement of the drill from its work, under the impulse
of the spring arm simply, is limited by the position of the spring arm p, and the
shock of such return movement is avoided by the slight yielding of said spring arm p.
The sliding bar O also brings the cam t into position to engage a roller on an
arm U fixed to a rock shaft V. To the rock shaft V is attached, by a feather and
groove connection, a laterally extending arm W, held normally depressed by a
spring X, abutting at one end upon the guide rod fixed to a sliding bracket Y.
The free end of the spring engages a slide a' on said rod, connected with the
arm W. The arm W is permitted to slide on a rock shaft V, but confined
between the ears of the sliding bracket Y, which latter carries the guide or finding
pin Z.
"
The bracket and parts connected therewith may be moved toward or away from
the drill by means of a screw 2, and may be clamped in any desired position. The
connection between the arm W and the finding pin Z, is made by links w and a
collar w¹, the latter being in the nature of a clamp collar, so as to admit of the
guide or finding pin being adjusted up or down within the collar, as may be desired,
in order to locate it at the proper height upon the pattern, when at its normal
limit of elevation.
An operating lever b, fulcrumnied at one end upon a link 6' connected with
the hanger A, is connected with the sliding bar O, for the purpose of throwing
the parts into and out of their operative positions; thus, for example, if the sliding
bar O be thrown toward the left, referring to Figure 1,-it will lift the sliding
bearing n, and the parts carried thereby, out of position to operate the spindle-
carrying slide, and the feed will cease to operate, while the spindle is free to be
retracted by the spring r. Such movement of the bar O will, at the same time, by
the engagement of the cam t with the arm U, rock the shaft V, and hence the arm W,
and thereby lift the guide or finding pin out of engagement with the pattern.
When, on the other hand, the sliding rod O is moved toward the right, it will first
force down the sliding bearing by the engagement of the spring arm p with
the cam, and thereby bring the drill into proximity to the work, and simul-
taneously therewith, will, by the release of the cam t from the arm U, permit the
finding pin to fall into engagement with a hole in the pattern, and subsequently,
as it nears the limit of its movement to the right, will force the sliding bar
downwardly, and thereby bring the feed-operating gear into position to operate
the slide, and hence feed the drill to its work.
To stop the downward feed at any pre-determined point, I provide a screw Q in
position to intercept the downward inovement of the slide f, and, in order to prevent
undue strain upon the parts when the feed is abruptly stopped, I mount the
pulley loosely on its shaft, except for the friction produced between the pulley.
and the shaft by the bracket y, which is attached to, the pulley and bears on a
collar g' fixed to the shaft. The degree of friction between the pulley i and its.
shaft, may be regulated by a screw q², so as to make it only sufficient to do the
legitimate work of feeding, and allow a slipping to take place whenever the feed
is forcibly stopped.
The table supporting the pattern and work is represented by M, and is mounted.
upon suitable rollers m³, which run upon a track n fixed on a sub-table N. The
sub-table N is also provided with suitable rollers n³, which run upon tracks o' fixed,
upon a suitable support ³, and extending in a direction at right angles to the
tracks n on the sub-table. It is intended that the tables M and N shall be
mounted so as to move with great facility, and because of the freedom of the
table M to move in either direction at pleasure, the pattern pl,thereon, and the
work p² secured thereon in the desired position relative to the pattern, may be
brought into adjustment, so that each one of the holes p³of the pattern may fall
directly beneath the axis of the finding pin Z. When so adjusted, the cutter or
drill will be in position over the work to. form a hole therein, corresponding to
that hole in the pattern in which the guide.or, finding. pin is engaged..

page_text: The conical shape of the end of the pin Z will tend to centre the pin within
the perforation, as the pin is depressed, as it will move the table by its pressure
against the side of the hole.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a machine for boring and drilling, the combination with the drill or
cutter, and means for operating it, of a pattern corresponding to the work to be
done, and a guide pin bearing a predetermined relation to the cutter, and
adapted to engage the different points of the pattern, and thereby determine
the position of the cutter relative to the work, substantially as set forth.
2. The combination with a drill or cutter, means for operating it, and a
suitable support for it, of a guide pin having a pre-determined position relative
to the cutter, and a pattern and work-support, the said work-support being free
to move in different directions to bring any point in the pattern beneath the
guide pin, substantially as set forth.
3. The combination with the drill or cutter, means for operating it, and a
guide pin having a position predetermined with respect to the cutter, of a
pattern and work-supporting table mounted upon rollers, and free to move in one
direction upon a track, and a sub-table upon which said track is supported, the
said sub-table being free to move upon a track in a direction at right angles
to the movement of the first-named table, substantially as set forth.
4. The combination of a cutter and a guide pin, and means for operating them,
of the automatic feed for feeding the drill through the work, substantially as set
forth.
5. The combination with the drill and the guide pin, and the driving mechanism,
of means whereby a single movement of a handle depresses the finding pin, and
forces it into the pattern, depresses the drill into close proximity to the work, and
sets the automatic feed in action, substantially as set forth.
6. The combination with the drill, the feed mechanism, and the means for
operating the drill, of a device for stopping the downward motion of the drill at
a proper depth, substantially as set forth.
7. The combination with the drill, the guide pin, and the means for operating
them, of means for throwing out the automatic feed, and returning the drill and
guide pin to their original positions, at a predetermined height above the work,
substantially as set forth.
Dated this 4th day of June 1900
NEWTON & SON,
Agents for the Applicant.