Improved Electrical Drill.
Year: 1891

page_text: Date of Application, 4th Sept., 1891
Complete Specification Left, 14th May, 1892-Accepted, 18th June, 1892
PROVISIONAL SPECIFICATION.
Improved Electrical Drill.
We, SIEMENS BROTHERS & Co. LIMITED, of 12 Queen Anne's Gate,
Westminster, in the County of Middlesex, Electrical Engineers, ALFRED
HERBERT DYKES, of 3 Mount Terrace, Mount Street, and FRANCIS GIBSON
BAILY, Ventnor Cottage, Mount Street, Charlton, in the County of Kent,
Electrical Engineers, do hereby declare the nature of this invention to be as
follows:-
This invention relates to a rotary drilling apparatus which is driven by electrical
energy supplied from a generator at a distance, the apparatus being so arranged in
a compact portable form that it can be readily applied in any position for drilling
holes in iron or steel plates.
For this purpose the apparatus is constructed as follows.
The frame consists of two parallel soft iron side bars connected together at an
intermediate part of their length by a transverse bar or yoke-piece of soft iron, and
connected at the one end by a transverse non-magnetic crosshead. On the inter-
mediate bar or yoke-piece are mounted two bobbins, the windings of which receive
the current from the generator at a distance, whereby the free ends of the two side
bars are made to constitute a pair of electromagnetic poles. These ends may be
enlarged in the form of feet having their bottom surfaces cup shaped, so that when
they are placed against the iron or steel plate to be drilled, this plate closing the
magnetic circuit causes the drill frame to adhere to the plate. Near the other ends
of the iron bars are attached arc shaped pole shoes forming another pair of poles,
and between these a ring shaped armature is mounted on a central hollow axis
parallel with the side bars, through which axis the drill spindle passes loose. The
end of this spindle runs in a bearing in the non-magnetic crosshead above referred
to and the part of the spindle beyond the armature is guided by passing through a
central hole in the iron cross bar or yoke-piece, between the two bobbins thereof.
The farther end of the drill spindle has a suitable socket for receiving a drilling
tool. The drill spindle is advanced as the drilling proceeds, by means of any
suitable screw action applied at its end.
The tubular spindle of the armature carries a suitable commutator the brushes
for which are fixed within a casing which is attached to the magnetic side bars and
which encloses the whole of the working parts, the one side of this casing carrying
a bearing for the tubular shaft of the armature.
On the other side of the armature its tubular spindle carries a toothed pinion,
with which gears a toothed wheel mounted loose on one of the magnetic side bars.
The boss of this wheel carries a toothed pinion which gears with a toothed wheel
fitted on the drill spindle with a feather in a groove so that the latter is caused to
rotate by the wheel while it is free to slide through it.
By means of the above described gearing the rotary motion of the armature is
imparted in a suitably reduced manner to the drill spindle.
The apparatus is provided with suitably placed eyes by which it can be slung for
bringing it into any desired position, vertical horizontal or inclined!
Dated this 4th day of September 1891.
ABEL & IMKAY,,
Agents for the Applicants.

page_text: COMPLETE SPECIFICATION.
Improved Electrical Drill.
We, SIEMENS BROTHERS & Co. LIMITED, of 12 Queen Anne's Gate,
Westminster in the County of Middlesex, Electrical Engineers, ALFRED
HERBERT DYKES, of 3 Mount Terrace, Mount Street, and FRANCIS GIBSON
BAILY, Ventnor Cottage, Mount Street, Charlton, in the County of Kent,
Electrical 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 a rotary drilling apparatus which is driven by electrical
energy supplied from a generator at a distance, the apparatus being so arranged in a
compact portable form that it can be readily applied in any position for drilling
holes in iron or steel plates.
For this purpose the apparatus is constructed as shewn by the accompanying
drawing which is a longitudinal section partly in elevation.
The frame consists of two parallel soft iron side bars A A connected together at
an intermediate part of their length by a transverse bar or yoke piece B of soft
iron, and connected at the one end by a transverse non magnetic crosshead C. On
the intermediate bar or yoke piece B are mounted two bobbins D D the windings
of which receive the current from the generator at a distance, whereby the free
ends a a of the two side bars A A are made to constitute a pair of electro magnetic
poles.
When these ends (which may be somewhat reduced as shewn, or which might be
enlarged, to form broader feet) are placed against the iron or steel plate to be
drilled this plate closing the magnetic circuit, causes the drill frame to adhere to
the plate.
Near the other ends of the iron bars are attached arc-shaped pole shoes forming
another pair of poles E E and between these a ring shaped armature F is mounted
on a central hollow axis G parallel with the side bars A A through which axis the
drill spindle H passes loose. The end of this spindle runs in a bearing in the
non magnetic crosshead C above referred to, and the part of the spindle beyond
the armature is guided by passing through a central hole in the iron cross bar or
yoke piece B between the two bobbins D D. The farther end of the drill spindle
has a suitable socket for receiving a drilling tool K. The drill spindle is advanced
as the drilling proceeds, by means of a screw L.
The tubular spindle of the armature carries a suitable commutator M the brushes
for which are fixed within a casing N which is attached to the magnetic side
bars A A and which encloses the whole of the working parts, the one side of this
casing carrying a bearing for the drill spindle H. On the other side of the
armature its tubular spindle carries a toothed pinion P with which gears a toothed
wheel Q mounted loose on one of the magnetic side bars A. The boss of this wheel
carries a toothed pinion R which gears with a toothed wheel S fitted on the drill
spindle H with a feather in a groove, so that the latter is caused to rotate by the
wheel while it is free to slide through it.
By means of the above described gearing the rotary motion of the armature is
imparted in a suitably reduced manner to the drill spindle.
The apparatus is provided with suitably placed eyes such as T by which it can
be slung for bringing it into any desired position vertical, borizontal or inclined.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what
we claim is :-
An electrical drill having its frame consisting of two soft iron side bars magnetised a
by electrical bobbins on a cross bar connecting them, the ends of these bars adhering

page_text: by attraction to an iron or steel plate to be drilled, and having on them pole
segments forming field magnets for an armature which by suitable reducing gear
drives a central drill spindle, substantially as described.
Dated this 12th dow of Mow 1000
ABEL & IMRAY,
Agents for the Applicants.