Improvements in or connected with Drill-presses.
Year: 1892

page_text: Date of Application, 22nd Nov., 1892-Accepted, 31st Dec., 1892
Improvements in or connected with Drill-presses.
A communication by JACOB NEFF BARR, of Milwaukee, in the County of
Milwaukee and State of Wisconsin, United States of America, Engineer.
1, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street,
Manchester, both in the County of Lancaster, and 323, High Holborn, in the
County of Middlesex, Civil Engineer, 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:-
The aim of this invention is to provide a device which may be instantly applied
to and removed from an ordinary drill-press for the purpose of enabling the
machine to operate at one time a number of drills. To this end it consists
essentially in a frame adapted to be attached to and sustained and adjusted by the
ordinary spindle of a drill-press, and containing a series of secondary drill-spindles
and gearing through which they may all be operated at one time from the main-
spindle.
In its most highly developed form the mechanism includes also means for
adjusting the senondary drills in order to change their relation to each other and
to the central drill thus permitting a series or group of holes to be made at one
operation and in any required relation to each other.
In the accompanying drawings-
Figure represents a perspective view of an ordinary drill-press provided with
the attachment in its preferred form.
Figure 2 is a horizontal section of the attachment on the line 2-2 of Figure 3.
Figure 3 is a side elevation of the same with one end shown in vertical section on
the line 3-3 of Figure 2.
Figure 4 is a top plan view of the mechanism in its more simple form.
Figure 5 is a vertical cross-section of the same on the line 5-5.
Referring to Figures 1, 2 and 3, A represents the spindle of an ordinary drill-
press combined with mechanism by which it is rotated and raised and lowered
endwise subject to the will of the attendant. B is a sleeve or collar adapted to fit.
snugly over the lower end of the spindle, and provided with a set-screw b, or other
means, by which it may be firmly attached to the spindle so as to be sustained and
rotated thereby. The sleeve B is provided with an encircling gear C fixed rigidly
thereto. The sleeve is also encircled by and gives support to a frame D, to which
there are connected secondary frames or arms E E³, having vertical journals e,
seated therein, so that the secondary frames may be swung horizontally around
their journals. Each of the arms E E' carries at its outward end a vertical rotary
spindle F, with the projecting lower end socketed to receive a drill G. As these
drills are carried in the outer ends of the arms it will be observed that the
horizontal turning or swinging motion of the arm has the effect of changing the
distance between the drills & and a central drill H, carried by the spindle of
the drill-press. Each of the secondary spindles is provided with a driving
pinion I, receiving motion from a pinion J. The pinions.) are each mounted on
a vertical shaft or spindle K, passing vertically and axially through the arm E,
and carrying at the upper end a pinion L, which engages with the main gear C,
before referred to. The frame D is provided with a laterally-projecting arm d, of
any suitable form adapted to bear against and slide along the vertical edge of a
plate M, which is bolted temporarily to the bed or other suitable portion of the
Pris 31

page_text: press for the purpose of preventing the rotation of the frame D, while allowing it
to be raised and lowered by the spindle.
When the spindle A is set in motion it rotates the sleeve B, and its gear C,
which latter in turn imparts motion to the pinions L, and thence through shafts K,
and the pinions J on the lower ends of said shafts, to the pinions 1 on the secondary
spindles.
From the foregoing it will be understood that the frame D and the various parts
mounted therein constitute a portable attachment which, being applied to an
ordinary drill-press enables the same to operate in addition to its ordinary drill
additional drills turning in the same direction and adjustable to and from the
central drill at will.
The arms E E carrying the secondary spindles, are secured in positions in which
they may be adjusted by clamping bolts, m passing axially through the spindles K,
and through the frame and provided with a binding nut at one end.
It is to be observed that the attachment as a whole is sustained and adjusted
vertically by the main spindle, the main and the secondary drills being controlled
alike in their vertical movements.
While the frame B is represented as provided with only two arms E E', it is to
be understood that the number may be increased to any desired extent.
In order to control the relative depths of the holes formed by the several drills,
it is proposed to provide cach of the secondary spindles F, with a drill-carrying
socket N, screwed therein so that it will be raised or lowered in relation to the
spindle, and to lock these sockets by means of jam-nuts or collars O, as plainly
shown in the drawing.
In the event of its being required only to drill the several holes in a constant
relation to each other, the swinging arms E E¹ may be dispensed with and the
secondary spindles mounted directly in the frame D. This construction is shown
in Figures 4 and 5, in which B represents a sleeve or attachment to the drill-
press C the pinion fixed to said sleeve; D the frame sustained by the sleeve, and
K the secondary drill-spindles mounted in the frame and provided with pinions I,
which receive motion through intermediate or idle pinions L, from the main'
gear C. The idlers are used for the purpose of causing the secondary spindles to
turn in the same direction as the main spindle. This, of course, is not necessary
but is advisable because drills are generally constructed to cut to the right. In
making use of this second form of the device it will be fixed upon the spindle of a
drill-press or other machine in the same manner as the device first described and
will be prevented from rotating by an arm or guide of any suitable character with
which it will contact...
While the attachment has been described as constructed with its driving-shaft
or sleeve B, in the form of a tube or sleeve to slip over the spindle of a drill-press
it is proposed in some cases, and particularly where the spindle of the press is of
small diameter, to make the shaft B solid, that is to say, in the form of a shank or
arbor to be fitted into a socket in the end of a drill-spindle in the same way that
an ordinary drill fits in, as indicated in outline in Figure 6. It is to be understood,
therefore, that the invention is not limited to the use of the spindle or sleeve B in
tubular form, and that the word "sleeve" as employed in the claims is intended to
include the spindle B, whether tubular or of solid form, provided only it is adapted
for attachment to the spindle of the drill-press or other controlling machine.
.11.
While the device is shown attached to a press having a longitudinally-movable
spindle it will, of course, be understood that it is applicable in the same manner to
that class of drill-presses in which the rotary spindle is fixed against end motion
and a rising-bed employed to carry the metal against the drill.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me by my
foreign correspondent, I declare that what I claim is
1. A. multiple drilling attachment for a drill-press consisting of a portable frame,

page_text: drill-spindles therein, gearing to drive said spindles, and a gear-operating sleeve
or shank adapted for attachment to the spindle of a drill-press substantially as
described.
2. A multiple drilling attachment for a drill-press consisting of a sleeve or shank
adapted for attachment to the spindle of the press and provided with a gear, a
frame in which the sleeve revolves and which is sustained thereby, secondary
spindles mounted in the frame and gears encircling said spindles and engaging with
the gear of the sleeve.
3. In combination with a drill-press having the rotary longitudinally-adjustable
spindle, a frame sustained by the spindle, a stationary guide against which the
frame slides to prevent its rotation, secondary drill-spindles in the frame and gears
in the frame connecting the secondary spindles with the main spindle.
4. In an attachment for a drill-press, a frame, a driving gear turning therein,
and adapted for connection with the spindle of the press, an arm adjustably
pivoted to the frame, and carrying a secondary drill spindle, a pinion on the
secondary spindle and intermediate pinions connecting the last named pinion with
the gear.
5. The frame D, swinging arms E E', and spindles F F, in combination with the
sleeve B, gear C, and pinions I J L.
Dated this 21st day of November 1892.
WM. P. THOMPSON & Co.,
Agents for the Applicant.