Improvements in Drilling-machines.
Year: 1891

page_text: Date of Application, 18th Apr., 1891-Accepted, 23rd May, 1891
CUM DEIL SIEIFICATION.
Improvements in Drilling-machines.
I, FRIEDRICH Gildemeister of Bielefeld in the German Empire, Manu-
facturer 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 improvements in drilling-machines, and the object of the
same is to enable a quick and precise start, a swifter drilling, and also an exact
guiding of the drill, thereby producing by far cleaner and neater holes, than could
possibly be arrived at in machines hitherto in use.
I attain this object by providing the machine with a feeding-device, which can be
actuated by hand-lever or in the usual manner by hand-wheel, pinion and spur-
wheel, in both cases the raising of the spindle is a self-acting one by either counter-
weight or spring. For guiding the drill the wall-machine is provided with
fastening- or locking-devices hereafter more fully explained.
In order to have my invention well understood, I refer to the accompanying
drawing, in which similar letters denote similar parts throughout the different views
and in which :-
:-
Fig. 1 is an elevation of the complete drilling-machine,
Fig. 2 is a plan, and
Figs. 3-6 are details of the drill-spindle and feeding-device,
has a
Figs. 7-8 are details for guiding and locking the arms of the frame.
The upper-bearings of the screw being in one with the frame
bracket cast on, bearing the pivot of a sector-shaped arm and a vertical shaft k.
The sector-shaped arm i has a half-nut attached to the end thereof, which gears
into the screw n. The vertical shaft is on top provided with an eccenter or
cam and on its lower end with a handle within easy reach of the workman. By
left-handed turning of the handle the cam will press against the arm i and gear the
nut into the thread of the screw », thus forcing the spindle to move down when
made to revolve by the wheels p. When turning the handle right-handed the cam
will release the nut, which will be thrown out of gear by the spiral-pring m.
screw thus being at liberty to move vertically inay be drawn upward along with
the drill-spindle by the counter-weight or by a spring not illustrated on the
drawing. The sector-shaped armi and spring m may be replaced by the device
illustrated in Figs. 5 and 6. Here there is a slider attached to the nut operating
in combination with an eccenter in similar manner as before.
The
The drill-spindle is connected to the screw n in the following manner :
The pressure-bolt is let into the upper end of the spindle and being provided
with a boss is coupled thereunto by a screw-plug . The rear-end of t is also let
into the screw and attached to the same by a pin. A collar sits on an offect of
the bolt and is also attached to it by a pin. Between the under face of the
screw and the collar there is a loose ring, which is linked to the hand-lever = by
two pivots, the hand-lever having the form of a fork between which the ring r is
hinged. The bearing points of the spindle and the bolt being rounded off, case-
hardened and always kept properly oiled, will permit the pressure to be transmitted
to the spindle without loss of power by friction.
K
In wall-drilling machines the frame a carrying the spindle may be hinged to a
wall-bracket and thus be able to rotate. The lower bearing has a disc e cust on,
concentrical to the axis of rotation. Unto the frame a there is a lug ƒ cast on
holding a stopper-screw or cam g' for the sake of tightening the same to the
dise The same device is applied to the frame.r.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
1. In a drilling-machine: A half-nut (1) gearing into the thread of the spindle-
screw and operated by a hand-lever, in combination with a drill-spindle and a
counter-weight tending to raise the spindle as for the purpose set forth.
2. In a wall-drilling machine: The disc (e) cast unto the hinge in combination
with a stopper-screw carried by the rotating arm and locking the same against the
disc, as for the purpose set forth.
3. In a drilling-machine: The half-mut () gearing into the thread of the spindle-
serew (a) and operated by a handle, in combination with a hand-lever (-), the drill-
spindle (s), the spindle-screw (n), the loose ring (e), and fixed ring (4), the
bolt () and screw-plug t'as for the purpose set forth.
Dated, Berlin, this 16th day of April 1891.
pressure-
FRIEDRICH GILDEMEISTER.
By Robert Deissler,
38, Alexanderstrasse, Berlin, C., Germany, Agent for the Applicant.