Improvements in and relating to Drilling Machines.
Year: 1896

page_text: Date of Application, 19th Dec., 1896-Accepted, 6th Mar., 1897
COMPLETE SPECIFICATION.
Improvements in and relating to Drilling Machines.
We, JAMES HEWITT, and THомAS POLLOCK, of 24 Portland Crescent,
Manchester, in the County of Lancaster, Engineers, 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 drilling machines and its object is to provide these
machines with appliances or to otherwise so construct them that they may be
simply and easily employed for different operations involving different speeds such
as drilling, tapping, screwing and facing, without the trouble and inconvenience of
constantly changing the tools or altering the speed of the machine.
In carrying this invention into effect the sliding drill head of the machine is.
provided at its lower part with a capstan head or turntable provided with a suitable
number of spindles for the different tools and so arranged that any one of the
spindles may be brought into gear with the main spindle.
In order that our invention may be more readily understood we have hereto
appended a sheet of drawings which illustrate the application of our improved
device or apparatus to an ordinary radial arm machine, the capstan head being
shown as carrying tools adapted for drilling, tapping, screwing a stud into place,
and facing the end of the stud, although it will be understood that a different
number of spindles and tools may be carried, and that the tools may be of a
different class. In the example illustrated, two of the tools, the drill and the
facing tool, are arranged to rotate at one speed, and the other two at a different
speed.
We will now describe our invention with reference to the drawings.
Figures 1 and 2 represent respectively a cross section and an elevation of the
capstan head applied to a radial drilling machine, the secondary spindles in the
head being driven by spur gearing.
Figure 3 illustrates the capstan head in plan.
Figure 4 shows in cross section a modified form of capstan head in which the
secondary spindles are arranged to be driven by bevel gearing.
The saddle A is formed on the face with V-grooves or the like upon or within
which the sliding head B is capable of moving vertically. This head carries the
main spindle C which may be adapted to be driven in the usual manner or in any
suitable manner, as, for example, by bevel wheels D, D', either of which can be
thrown into gear according to the direction of rotation required. To the lower
end of the head B is fixed a turntable or capstan head E provided with four
spindles a, b, c, d, each of which is bored or otherwise formed for the reception of
a drill or other tool. Each spindle is provided with a spur wheel or pinion as
shown at e and f, Figures 1 and 2, and is capable of engaging with one or other of
two wheels or pinions F, G, secured to the bottom end of the main spindle C,
according to the speed required. In the example shown the comparatively large
wheel e which is attached to the stud spindle is arranged at such a distance from
the centre of rotation of the capstan head, that it engages, when in its operative
position, with the pinion G on the main spindle and is consequently driven at a
slow speed. The pinion of the diametrically opposite drill spindle is placed much
nearer the centre of rotation, and, consequently, when the capstan head is rotated
to bring the drilling spindle c into the operative position, the pinion gears with
the wheel F and the spindle is driven at a fast speed.

page_text: The capstan head E is capable of being rotated around the pivot or centre H so
that any one of its spindles may be brought to its lowest vertical position in which
position it gears with and is operated by the main spindle C. The spindle a is
shown as being operated in the Figures 1 and 2 and the other capstan spindles are
idle. The drilling and facing spindles c and d are provided with pinions of the
same size which gear with the wheel F and are consequently driven at a high
speed, and the tapping and screwing spindles are provided with wheels which
engage with the pinion G and are consequently driven at a much slower speed.
The capstan head may be locked in place or released when desired by any
suitable and convenient means. It may be furnished on its inner face with pegs or
projections which are capable of engaging with suitable recesses in the face of the
sliding head. When such projections are used the capstan head must be withdrawn
from the sliding head before it can be rotated. This may conveniently be effected
as shown in Figures 1 and 2 by screwing the end of the spindle or shaft H and
putting thereon a handled nut J which can rotate within but cannot be withdrawn
from the capstan head. The rotation of the nut therefore, moves the capstan head
away from or towards the sliding head. To bring any desired tool into operation
the capstan is withdrawn until it is disengaged from the sliding head. It is then
rotated until the proper tool is in position and is then again screwed up and locked
in place.
The sliding head is preferably balanced by means of the weight K, and it may
be provided with and operated by any known or suitable feed motions or devices
customary in drilling machines.
Figure 4 illustrates the application of the capstan head to a drilling machine,
bevel gearing being adopted to effect the rotation of the capstan spindles. The
main spindle C has at its lower end a bevel pinion L which engages with the teeth
on one face of a double bevel wheel M, the teeth on the other side of which gear
with the teeth of the pinions N on the capstan spindles.
It is preferred to also form the bottom of the main spindle for the reception of
tools or the like so that this spindle may be used separately from the capstan
head.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim, is :-
1. A drilling machine provided with a capstan or rotatable head carrying two
or more secondary spindles arranged and operated substantially as herein before
described and as illustrated by the accompanying drawings.
2. In a drilling machine, a capstan or rotatable head provided with two or more
secondary spindles arranged and operated substantially as herein before described
and as illustrated by the accompanying drawings.
Dated this 18th day of December 1896.
W. E. HEYS & SON,
Agents for the Applicants.