Improvements in Drilling Attachments.
Year: 1897

page_text: Date of Application, 23rd June, 1897-Accepted, 7th Aug.,
1897
COMPLETE SPECIFICATION.
Improvements in Drilling Attachments.
I, HUGH LAWSON WARNER, of Hamilton, Butler County, Ohio, United States of
America, Cycle Maker, do hereby declare the nature of this invention, and in
what manner the same is to be performed, to be particularly described and ascer-
tained, in and by the following statement.
This invention pertains to attachments to single-spindle drilling machines to
readily adapt such machines for the drilling at one time of a number of holes
arranged in regular or irregular groups, and to permit convenient changes in the
relative disposition of the drills to suit changings in the groupings of the holes
to be drilled. My attachment will be found of special value in drilling the spoke-
holes in the flanges of the hubs of bicycle wheels, and for similar drilling in
articles where a number of small holes are grouped very close together.
There is in common use a class of drilling machines known as sensitive drills,
arranged with one drilling spindle and with suitable feeding devices. My drilling
attachment readily lends itself to use in connection with these sensitive drills, the
attachment being capable of instant application, and of ready removal so as to
leave the machine in its normal condition.
My improved drilling attachment will be readily understood from the following
description taken in connection with the accompanying drawings in which:-
Fig. 1 is a side elevation of a drilling attachment exemplifying my invention
when embodied in a form suited for the drilling of the full circle of spoke holes
in the flange of a bicycle hub:
Figure 2, a vertical diametrical section of the lower portion of the same:
Fig. 3, a plan of the lower portion of the attachment:
Fig. 4, a side elevation of the attachment shown in connection with the drilling
spindle and work table of an ordinary sensitive drill, the parts being shown in
connection with a bicycle hub being drilled:
Fig. 5, a vertical diametrical section of an ordinary bicycle hub, shown in con-
nection with the template which may form part of my drilling attachment:
Fig. 7, a vertical diameterical section of the spindle-bearings in connection with
template to the smaller end of the hub to be drilled and
:
Fig. 7, a vertical diametrical section of the spindle-bearings in connection with
the template and part of a bicycle hub, this view illustrating a steadying work
guide.
In the drawings:-
1, indicates the usual table of the ordinary drilling machine:
2, a bicycle hub standing thereon to have the spoke holes drilled in its upper
flange:
3, the usual spindle of the drilling machine:
4, the usual feed-sleeve of the drilling machine:
5, the usual bracket-arm of the drilling machine:
6, the usual feed-lever of the drilling machine :
7, a housing adapted to be secured to the lower end of sleeve 4 and to support,

page_text: below the socket of the drill spindle, a group of vertical bearings for the multiple
drill spindles :
8, a split clamp formed on the upper end of the housing 7, and exemplifying
convenient means for readily securing the housing rigidly to sleeve 4:
9, a hollow hub carried rigidly by the lower end of housing 7, this hub being
disposed in axial line with and a distance below the socket in the lower end of
the drill spindle of the drilling machine:
10, a disc removably but rigidly secured in the upper end of the hub 9 and
provided with a central aperture forming a socket and a multiplicity of vertical
apertures disposed relative to each other according to the grouping of the holes
which are to be drilled, the group in the illustration being a complete circular
series, suited to the usual disposition of the spoke-holes in a bicycle hub:
11, a corresponding disc removably secured in the lower end of hub 9:
12, the multiple drill spindles, finding their bearings in the vertical apertures
in the discs 10, and 11, the bodies of these multiple spindles being plain so as to
be capable of ready insertion and removal into and from their bearings in the discs,
each of these multiple drill spindles having a socket in its lower end to receive the
shank of its drill:
13, the drills, with their shanks secured in the sockets of the spindles 12 by
being soldered therein, the drill and its spindle then forming an integral
structure:
14, a template in the form of a ring pierced with holes engaging the lower end
of the drills, this template having an aperture adapted to fit upon the bicycle hub,
at its larger end, as seen in Fig. 5:
15, studs, several in number, distributed around the template 14 and having
their lower ends secured to the template, the upper portion of these studs sliding
in guide holes in dise 11, heads on the upper ends of the studs limiting the drop
of the template with reference to the spindles and drills, the preference being that
the drills normally project little if any beyond the lower face of the template:.
16, helical springs surrounding the studs 15 between the template and the
disc 11 and holding the template to its extreme downward position, but permitting
it to yield upwardly upon the drills:
17, a crank formed upon the upper end of each of the multiple drill spindles,
all of the cranks being uniform in throw, the crank pins projecting upwardly and
having preferably hemispherical ends:
18, a disc resting upon the crank pins of the multiple drill spindles and having
in its lower face a bearing for each crank pin, oil holes being drilled from the
top of the disc downward into each of the crank pin bearings in the disc:
19, a driver consisting of a disc disposed above disc 18 and having a shank
fitting the usual drill socket of the drilling machine:
20, a crank pin, formed on or secured in the lower end of driver 19, this crank
pin engaging a bearing in dise 18 and having a throw equal to that of cranks 17
on the drilling spindles, a cotter in the lower end of crank pin 20 serving to unite
disc 18 to the driver:
21, a circular series of balls disposed in a groove in the upper surface of disc 184
and engaging under a collar on crank pin 20:
22, a bushing adapted to fit within template 14 and to fit upon the smaller end
of a bicycle hub in case the hub has one end enlarged, as is usual, to receive a
sprocket wheel: and
23, a plug secured in the central apertures or sockets in discs 10 and 11 and
projecting downwardly therefrom, beyond template 14, and having a diameter
adapted to fit the interior of a bicycle hub.
As the spindle of the drilling machine turns it gives an orbital motion to disc 18
and results in the rotation of the multiple drilling spindles. As the spindle of
the drilling machine is fed downward, carrying all the drills and the template 5
with it, the template engages over the larger end of the bicycle hub and centres
the hub in the attachment. The feeding motion being continued the springs 16

page_text: yield and the drills protrude through the template and drill through the flange
of the bicycle hub. While the drilling is going on the bicycle hub need not be
clamped or held, there being no rotative tendency. When the drilling is completed
and the spindle of the drilling machine elevated the template leaves the hub. In
drilling the other smaller end of the hub the bushing 22 may be put upon the
hub to make it fill the template. Plug 23, fitting within the bore of the hub,
steadies the work and in many cases will permit bushing 22 to be dispensed with
and even avoid the necessity for having the template fit the hub.
The crank system for giving motion to the multiple drill spindles is the pre-
ferable transmitting device and is one of great simplicity and efficiency. The
thrust of the multiple drill spindles is taken by the crank pin bearings in disc 18
and is thence transmitted through balls 21 to the spindle of the drilling machine.
By removing the attachment from the drilling machine, then driver 19 with its
disc 18 can be lifted from the drill spindles, and any or all of the drill spindles can
be readily withdrawn upwardly and removed from the attachment. The discs 10
and 11 and 18 and the template 14 may have only such apertures as the spindles
in immediate use require or they may have apertures not immediately needed,
and the drilling spindles may be shifted at pleasure among the apertures, thus
permitting the drilling of holes in variously arranged groups. In the drawing
the attachment is shown as being provided with eighteen spindles to drill a com-
plete circle of holes. One or more of these spindles may be removed from the
attachment, almost instantly, thus fitting the attachment for drilling holes in
groups, the groups being arranged in circular series, and, similarly, almost any
desired disposition of holes may be provided.
In securing the drills in their spindles, the shanks of the drills are first tinned,
and then sweated into their spindles. A drill may be removed and a new one
inserted in the spindle in a minute by holding the socket end of the spindle over
a burner or blow-pipe and withdrawing the drill and inserting a new one.
In Fig. 4 my attachment is illustrated in connection with that usual form of
sensitive drill in which the feed is effected by downward motion of the drill spindle
toward a stationary work table. It is obvious that the attachment is equally
applicable to that ordinary type of drilling machines in which the feed is effected
by moving the table upwardly toward the drill spindle.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what I
claim is:
1. In a drilling attachment, the combination, substantially as set forth, of a
group of spindles with drills, a bearing-structure therefor, a template supported
by said bearing-structure and engaging near the ends of the drills and having a
bore to fit a part of the piece to be drilled, and a bushing fitting said bore and
fitting a smaller part of the work to be drilled.
2. In a drilling attachment, the combination, substantially as set forth, of a
bearing-structure having a socket, a group of drill-spindles journalled in said
bearing-structure around said socket, an annular template, and a plug engaging
said socket and projecting therefrom parallel with said drill-spindles. and through
said template.
3. In a drilling attachment, the combination, substantially as set forth, of a
pair of separated dises or plates rigidly but separately secured in a hub or holder
and having each a central bore, drill-handles journalled in said plates around
said hore, and a plug engaging the bore of both plates and projecting parallel with
the drill spindles.
4. In a drilling attachment, the combination, substantially as set forth, of a
hollow hub or holder, a plate or disc rigidly but separately secured in each end
thereof, and a group of drill-spindles journalled in said plates or discs.
5. In a drilling attachment, the combination, substantially as set forth, of a
housing having bearing dises separably but rigidly connected therewith, a clamp

page_text: on said housing adapted to engage a part of a drilling machine and support said
hearing-structure near the end of the machine spindle, a group of drill-spindles
journalled in said bearing-structure, and transmitting devices engaging said
drill-spindles and adapted to engage said machine spindle.
6. In a drilling attachment, the combination, substantially as set forth, of a
housing adapted to have one end secured to a part of a drilling machine, a hub
carried by the free end of the housing, a bearing rigidly but separably borne within
the hub near the end of the spindle of the drilling machine, a group of drill-
spindles journalled in said bearing-structure, and transmitting devices connecting
said group of spindles with the spindle of the drilling machine.
7. In a drilling attachment, the combination, substantially as set forth, of a
housing having a split clamp and a bearing-structure in a common axial line, a
hub enclosing and protecting said bearings, a group of drill-spindles journalled
in removable bearings carried by said bearing-structure around said axial line,
and a driver connected with said spindles and projecting in said axial line toward
said split clamp.
8. In a drilling attachment, the combination, substantially as set forth, of a
hub having a series of parallel bearings having an arm projecting upwardly and
provided at its upper end with a clamp to engage the feed-sleeve of the drilling
machine, drill spindles mounted in said bearings and provided with cranks at
their upper ends, a disc having sockets resting on the crank ends of said drill
spindles, a shank fitting the spindle of the drilling machine, and a crank pin
carried by said shank and engaging said disc.
Dated this 23rd day of June 1897.