Improvements in and connected with Drilling Apparatus.
Year: 1898

page_text: Date of Application, 5th Nov., 1898-Accepted, 14th Jan., 1899
COMPLETE SPECIFICATION.
Improvements in and connected with Drilling Apparatus.
I, EMIL DIEHL, of 92, Zwickauerstrasse, Leipzig, in the German Empire,
Manufacturer, 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:-
In the construction of machinery a very frequent operation is that of drilling
holes, which must have a common or mutual geometrical axis.
For the purpose of drilling these holes precisely in the right spot, they are
either sketched or outlined, or else boring-pattern plates i.e. templates are made
use of, the outlining being dispensed with. The drill-templates are fitted with
hardened guiding sockets overlaid with steel, and, in these sockets, the drilling
instrument is guided at the sides during the boring operation in order that it may
not travel untruly (out of truth). Each boring pattern is usually fixed on a plate
which is brought to bear exactly against a machined or prepared surface of the
piece of work. The supporting plate however, carries two boring patterns, one
for the front, the other for the back hole. In this way it is easy for inaccuracies
to occur, as it is difficult to secure exact agreement in the position of the two
boring patterns. It is, therefore, advantageous to prepare them only when the
machine parts to be bored are in considerable number. Consequently, in the
case of machines occupying considerable space, it has been preferred to dispense
with the pattern plates and to resort to the old method of sketching or outlining.
According to the present invention, the boring pattern is put on an axle or
shaft, which serves as a butt for it and lies evenly against a surface of the piece
of work which is parallel to the drilling or boring apparatus so that the boring
pattern plate can be pushed on each side of the piece of work beyond the rotary
shaft, and thereby must remain on both sides at precisely the same distance trom
or, in other words, from its resting surface or support.
it
Figure 1 illustrates the boring apparatus generally hitherto used, Fig. 2 the
axle or shaft of the new apparatus as applied to the surface of the piece of work.
Fig. 3 a special form of axle or shaft. Fig. 4 a boring pattern plate.
Figure 5 a piece of work, with boring pattern plate in front of it. Figure 6 an
adjustable pattern plate.
In Fig. 1 a boring apparatus of the kind formerly employed is shewn, as
mentioned in the introduction. The template or boring pattern B is fixed on the
supporting plate P.
Fig. 2 shews a part M of a machine, furnished with three pairs of holes y¹
KL and y K2 L2, each pair of which should lie in the same geometrical axis.
The axle A, which is intended to serve as a butt or support for the boring pattern
plate, is laid on one of the machined surfaces of the part M of a machine, and lies
against the projecting angle corner. The axle A may be of such a length as to
project beyond its resting surface or support, so that the boring pattern plate can
be brought beyond (or over) the free ends on either side, or the axle is first allowed
to project on one side being afterwards adjusted for use on the other side of the
hing nort

page_text: In place of a completely cylindrical axle or shaft, a shaft or axle can be used,
as shown at A (Fig. 3), which has only its ends Z1 Z2 cylindrical. For the better
adjustment of the shaft A against wedge-shaped or undercut surfaces, it can be
correspondingly shaped on one side as at x.
In order to ensure the exact guiding of the template or boring pattern-plate on
the axle A, the former (Fig. 4) may be furnished with a hole D, which corresponds
exactly with the diameter of the axle A. The boring pattern plate there illus-
trated, carries on the end opposite to the hole and on each side a cross-piece or
support F1 F2, the under surface of which is evenly planed. A second positive
guide or support for the boring pattern plate in addition to the axle is thereby
provided, no matter on which side of the machine-part it is employed. However,
as an additional support or guide any known means can be used, for instance, a
cylindrical shaft can be fixed in the boring pattern plate, projecting from it on
both sides.
Fig. 5 illustrates the application of the boring apparatus. The right position
of the guiding sockets of the boring pattern plate B, in relation to the piece of
work M is ensured on the one hand by means of the axle A, on the cylindrical
end of which the boring pattern plate is placed, and, on the other hand, by
the projection F which is supported on the machined surface of the piece of
work, and to which it is to a certain extent made fast by clamps or the like.
When the holes y¹ K' L' have been bored, the axle A is pushed so far back
that the cylindrical end 72 projects beyond the back surface and the boring
pattern plate B is pushed over the end 72, the projection F2 then coming into
use, the back holes y² K² L² can now be bored.
In the case of such holes as must be bored with boring bars and bits instead
of twisted drills, two adjuncts or attachments such as A are employed instead
of one only, as well as two templates or boring pattern plates, the boring bar being
allowed to move simultaneously in the two corresponding sockets of the two
boring pattern plates, whereby the correct parallel position of the boring bar is
ensured without further trouble.
In order to avoid the necessity of employing a special template for parts of
machines of every size, the universal boring pattern plate (Fig. 6) may be used.
This latter differs from the special or individual pattern plate in the fact that
the plate B, with the guiding sockets, is adjustably attached to a plate T, which,
for the purpose of attaching it to the axle or shaft A is furnished at one end with
a hole D and at the other end with the extensions or side plates F¹ and F². In
order that it may be possible to adjust both parts opposite to each other, slots,
for example, are provided for the fastening bolts etc., so that both plates, within
certain limits, can be pushed in two directions lying at a right angle to one
another, the arrangement being such as to permit of the plates B being moved or
adjusted in a transverse direction on the plates T which are themselves capable of
being moved in a longitudinal direction. For the correct adjustment of the
pattern plate B, which carries the steel socket, metrical lines are engraved upon
the plate T. Within certain limits it is thus rendered possible to employ the one
boring pattern plate for work of similar kinds but differing in size.
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. Boring apparatus with boring pattern-plate characterised by the fact that
the boring pattern-plate (B) is provided with a support in the shape of a cylin-
drical axle or shaft (A), (or with an axle (A) having cylindrical ends), which rests
or is supported against a surface running parallel to the boring apparatus, the
boring pattern-plate being threaded on the one or other end of the axle or
shaft (A), for the purpose of enabling the same boring pattern plate to be used
on either side of the piece of work.
2. A boring apparatus according to Claim 1, characterised in that opposite to

page_text: plate.
the turning point 1) of the boring pattern plate B and on both sides of the same
side plates or projections F1 F2 are provided, the supporting or resting surfaces of
which lie exactly even, in order that first the one and then the other of the
projections may
be employed as a point of support or guide for the boring pattern
3. Boring apparatus with boring pattern-plate, according to Claim 1, character-
ised by the fact that the actual boring pattern-plate B, which carries the guiding.
sockets is adjustably attached to a plate T which is furnished at the one end
with a hole D' for the axle or shaft and at the other end with two projections F1 F³,
so that the actual boring pattern-plate may at any time be exchanged for another.
Dated this Fifth day of November 1898.
TUI the Applicant,
GEDGE & FEENY,
60, Queen Victoria Street, London, E.C., Chartered Patent Agents.