Improvements in and connected with Portable Drilling Apparatus.
Year: 1898

page_text: COMPLETE SPECIFICATION.
Improvements in and connected with Portable Drilling Apparatus.
I, EMIL CAPITAINE, of 5, Gutzkowstrasse, Sachsenhausen, Frankfort on Main,
Germany, 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:―
This invention relates to a further development of the principle which forms the
basis of the Patent Application No. 16028 of 1898.
In the application referred to, a description is given of an arrangement for
drilling holes in any desired positions relatively one to another, in pieces of
machinery by means of the so called portable drilling apparatus, and in which
operation the pieces of machinery to be drilled retain the same position, without
alteration, within the pattern plate.
Under the arrangement now described, there is a difference in the operation,
inasmuch as the machine parts to be drilled are moveable within the pattern plate.
On the figures of the accompanying drawing, the arrangement is shewn in
section, Figure 1 being a side elevation, Fig. 2 being a part view with the angle
plate in a different position and Fig. 3 is a sectional plan view of the apparatus
in another position.
An angle plate or support B is fixed by means of a screw-bolt to the frame or
standard A. The part B can be caused to turn on the vertical frame or standard A
as will be seen from Fig. 2, the screw-bolt v forming the pivot or axis. To the
angle plate B the circular plate C is firmly screwed and, in this plate, holes are
formed at various distances from the centre of the same; in the angle-plate is a
fastening or locking screw for pressing down the lever or arm i which firmly
holds the drilling apparatus. The lever or arm i engages below the inner flange
or projection c. As the plate, in which the locking screw for the lever or arm i is
seated is pivoted in the plate C, it is obvious that the lever can be so adjusted
beneath the inner flange c of the disc or plate C, that the drilling apparatus may
be secured at any point on the plate C.
Around the disc or plate C is a ring S revolving in the angle plate B. To this
ring the machine piece to be drilled is fixed. In Fig. 3, by way of example,_a
cylinder cover is shewn fixed to the ring S, as the machine part to be drilled. In
each cover a number of holes have to be drilled, which lie in a circle and at the
same distance from the centre of the cover. In this case, it is only necessary to
fix the boring apparatus D over a hole in the plate C, which is at that distance
from the centre of the plate C. Into this hole a sleeve is put having a hardened
socket or collar, through which the drilling apparatus D is guided centrally on
this sleeve by means of its guiding additional piece. Around the ring S, holes
are formed at the required distances apart and into these holes a guiding or fixing
pin s is inserted. When a hole has been drilled, the boring spindle of the
apparatus D is screwed back (unscrewed or withdrawn) and the ring S within the
cover to be drilled, rotated as far as the spot where the next hole is to be drilled,
the pins being then inserted in the hole corresponding to this position in the

page_text: ring S and drilling being carried on afresh with the apparatus D without altering
the position thereof. If holes are to be drilled which lie at a different distance
from the centre of the plate C, as a matter of course a hole has first to be bored
in the plate at this altered distance, which hole serves for the reception of the
guiding sleeve and guiding collar or socket of the drilling apparatus.
If holes are to be drilled on the opposite side of the cover a second angle plate T
is used, this being fixed to the angle support B by means of other suitable screws
or bolts. The requisite position of this angle plate is regulated at any time by
means of the fixing vins z. As will be seen, the drilling apparatus D is also fixed
to the angular piece T by means of a lever or arm 2 (as on the disc or plate C).
According to requirement, two or more holes can be formed in the angular piece,
in which holes the guiding sleeve with guiding socket or collar for the drill can be
inserted, and to which the drilling apparatus is fixed.
On Figures 1 and 2, slings are shewn supporting the drilling apparatus.
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. A drilling arrangement or contrivance characterized by a circular drilling
pattern plate (C) for so called portable drilling apparatus (D) and a ring plate (S)
rotably arranged on the same, for fixing the piece of work to be drilled.
2. A drilling arrangement or contrivance according to Claim 1, the distinguish-
ing feature of which is that the drilling pattern plate (C) is fixed to an angle-
support (B,) which is arranged to rotate in a vertical plane on the upright or
standard (A).
3. A drilling arrangement or contrivance according to Claims 1 and 2, the
distinguishing feature of which is that an angle plate (T) is adjustably arranged
on the support (B) below the circular pattern plate (C), in order that the drilling
of the piece of work may be effected simultaneously from the underside.
4. A drilling arrangement or contrivance according to Claim 1, in which the
circular drilling pattern plate (C) is furnished with an inwardly projecting
flange (c) which serves as a fulcrum for the lever or arm i, which can be rotated
around the centre of the drilling pattern plate.
Dated this 11th day of November 1898.