Improved Portable Electrical Drilling Machine.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improved Portable Electrical Drilling Machine.
T, ALPHONSE LOUIS CRONEAU, of No. 18, Rue Mogador, Paris, France, Engineer,
do hereby declare the nature of this invention to be as follows:-
My invention relates to an improved portable electrical drilling machine more.
particularly applicable for drilling holes in horizontal flat metal plates, such as
the sheet iron decks of ships and the like, which machine is of the following
construction.
A sheet metal platform is supported at one end by a wheel and at the other
end by two feet that are constructed as electromagnets fixed to the underside of
the platform and which serve to produce the effective adhesion of the machine
to a metal sheet or plate while this is being drilled by a drilling tool projecting
down between the two electromagnets. The drilling tool is carried in an upright
bracket fixed on the upper side of the platform, over the electromagnets, and
provided with a screw spindle and hand wheel, for forcing forward the drilling
tool as the drilling proceeds. The drill is rotated by means of an electromotor
fixed on the rear end of the platform the armature shaft. of which is connected
by an elastic or yielding coupling with a shaft carried in bearings in the drill
bracket and geared by bevil gearing with the drill spindle.
At the front end of the platform is fixed a box containing suitable resis-
tances included in the supply circuit of the electromotor and controlled by a
hand switch or commutator, which at the same time controls the supply of
current to the two electromagnets, for either causing these to adhere to the metal
plate to be drilled or for cutting off the current when the machine is to be
moved from one place to another.
At the front end of the platform are two projecting handles by which the
machine is moved about, and to which is attached a seat for the operator who
controls the switch or commutator.
The above described drilling machine is particularly adapted for drilling
holes in horizontal plates, such as the floor plates or bridges, or the iron deck
plates of ships, and it has the advantage over similar drilling machines acting
with magnetic adhesion heretofore employed that it is of comparatively small
weight and can be moved from one place to another with the greatest facility,
requiring only a single operator to work and move it, while the machines now
in use require several men.
Dated this 7th day of June 1899.
ABEL & IMRAY,
Agents for the Applicant.

page_text: improved fortabaligta
I, ALPHONSE LOUIS CRONEAU, of No. 18, Rue Mogador, Paris, France, Engineer,
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 a portable electrical drilling machine for readily
drilling flaf metal sheets or plates.
The machine is intended to perform drilling operations similar to those of
drilling machines of present construction that operate with magnetic adhesion
to the plate to be drilled, but my improved machine has the advantage over
these of great lightness, cheapness and portability, and is especially adapted
for a class of work for which the said machines are not well adapted. The said
machines of present construction are heavy and require several men to work
them, whereas my improved machine has the whole of its working parts com-
bined in a compact manner so that it can be readily moved about and worked
by a single operator, being specially applicable for drilling fat metal surfaces
such as the iron decks, of ships or floor-plates of bridges and the like.
I will describe the construction of the improved machine with reference to
the accompanying drawing in which Fig. 1 shows a side elevation of the machine,
Fig. 2 a plan and Fig. 3 a cross section on line A-B Fig. 1.
The same letters of reference represent the same parts in each of the figures.
The machine consists of a metal plate 1 which carries the whole of the parts
constituting the drilling machine; to the underside of this plate, in the same
vertical plane as the drilling tool, are fixed two electromagnets 3, capable of
producing on a plate of about 10 millimetres thickness an adhesion of from 500
to 600 kilos., sufficient for drilling holes of 30 to 40 millimetres. The drill
carrier 2, is directly actuated by the electromotor, through an elastic coupling 5
without the intermediary of a flexible member, and in using the ordinary means
of mechanical connection.
The resistances and the starting and controlling commutator 6, for the motor 4,
are fixed in front in convenient position for the operator; the current required
for the adhesion electromagnets is supplied through the same commutator, the
wires being connected to the first contact thereof after that for stopping.
The drilling tool 10, is carried in the usual manner by the tool carrier 2, and
its downward motion is regulated in the usual manner by a screw spindle with
hand wheel 11.
The combined apparatus is supported on the one hand by the electromagnets 3
and on the other hand by a wheel 9 carried so as to be at the same height as
the electromagnets, so that the drilling tool is always perpendicular to the plane
passing through the bases of the two electromagnets and the underside of the
wheel.
The machine is moved by means of the handles 7, which support a wooden
plate 8 which constitutes a seat for the operator who thus has the drill and the
controlling commutator conveniently before him. The weight of the operator
balances that of the motor. 4, relatively to the fulcrum formed by the electro-
magnets, and such weights consequently assist the magnetic adhesion.
The above described machine is particularly useful for drilling flat sheets or
plates for metal floors and decks of ships. As before stated a single workman
can move and operate the machine while all other similar machines require at
least two men.

page_text: It does away with the flexible connection which is necessary with the ordinary
drilling machines with magnetic adhesion.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, 1 declare that what
I claim is:
1. In a portable electrical drilling machine, the combination with a platform
carried at one end by a single wheel, of two electromagnets arranged at the
other end of the platform so as to support the same with magnetic adhesion on
the surface to be drilled, between which electromagnets is arranged the drilling
tool, actuated by an electromotor fixed on the rear end of the platform, the said
parts being arranged and operating substantially as herein described.
the
2. Apparatus for drilling metal sheets or plates, in particular flat metal sheets,
with magnetic adhesion device for keeping the surface to be drilled against the
drilling tool, consisting of the combination with a metal platform suitably
supported by a single wheel and two electromagnets constituting the feet of
the machine, and serving to produce the requisite adhesion of the machine to
the surface to be drilled, a bracket carrying the drilling tool fixed on
platform immediately over the electromagnets so that the drill operates between
these, an electromotor fixed on the rear part of the platform connected to the
driving shaft of the drilling tool by an elastic coupling, resistances and a com-
mutator included in the supply circuit of the motor and electromagnets, for
regulating the action thereof carried on the front part of the platform, and
handles on the platform carrying a seat for the operator so that he faces the
machine in a convenient position for controlling its action, substantially as herein
described.
Dated this Bth day of February 1900
ABEL & IMRAY,
Agents for the Applicant.