Improvements in Multiple Drilling Machines.
Year: 1894

page_text: Date of Application, 5th July, 1964-Accepted, 18th May, 1895
COMPLETE SPECIFICATION.
Improvements in Multiple Drilling Machines.
I, FRITZ ZINZEN, Mechanical Engineer, of Wagnerstrasse 18, Düsseldorf, in
the German Empire, 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 :-
The present invention relates to a drilling machine in which several drills can be
operated at the same time and at variable distances from each other.
In the accompanying drawings;
Fig. is a vertical section of the working parts of a multiple drilling machine
embodying my invention,
Fig. 2 is a horizontal section along line A-B of Fig. 1,
Fig. 3 is a vertical section along line C-D of Fig. 1.
As shown by the drawings, the drill spindles are arranged concentrically round
an axis and provided with universal joints, so that the lower ends of the drill spindles..
together with the drills may be shifted in all directions.
To facilitate the adjustment of the drilling spindles, the machine frame or stand F
is provided with a ring g, open at the top and at the bottom and provided at the.
top with a circular groove n, the clear width of the said ring being sufficient to
afford ample room for the spindle holders f, which are secured to the said ring by
means of bolts d, d, passing through the said groove or slot n.
Each of the spindle holders f forms approximately a right angle and the vertical
part of the same receives the drill spindle, while the flat horizontal part has a long
radial slot t, through which passes the fastening screw d.
For conveniently varying the distance of the drill spindles from the axis or
centre of the spindle carrying head, each of the said slots t contains a screw
spindle d' which passes with its thread through the fastening or holding-
down bolt d.
In order to place the spindles rapidly into the desired position in the circle,
the ring g mounted in the machine stand F is provided with regular divisions like
a dividing plate or disc, by means of radial grooves n¹ produced at suitable
intervals with a slotting machine. Grooves n³ of the same width as n' are also.
formed in the flat sides of the spindle holders at the base thereof, so that, when one
of the grooves n' is placed over one of the grooves n' and both are filled up by a
single key s, the latter forms an accurate radial guide for the drill spindle. To
facilitate the accurate setting of each spindle according to the diameter of the
circle in which the group of holes is to be situated, each spindle holder has on its
side a scale m in millimetres or other minute divisions, and au exactly circular line
is turned into the upper face of the ring g.
Any other suitable device may, however, be adopted for guiding the spindle
holder in a radial direction.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In multiple drilling machines, the above described means for holding the drill
spindles, chiefly comprising angle pieces the vertical sides of which receive the
drill spindle and are held by the horizontal sides, while the latter are mounted on a.
circularly grooved easing or spindle-carrying ring.

page_text: 2. In a multiple drilling machine, a guide-ring or spindle-carrying ring mounted
in the machine stand and provided with divisions like a dividing plate or disc, for
facilitating the rapid and accurate setting of the drill spindles in a circle,
substantially as described.
Dated this 3rd day of July 1894.
FAIRFAX & WETTER,
433, Strand, London, Agents.