Improvements in or relating to Cutting or Boring Tool Holders for use in Lathes, Boring Machines, and Similar Machines.
Year: 1896

page_text: Date of Application, 6th Oct., 1896-- Accepted, 25th Sept., 1897
COMPLETE SPECIFICATION.
Improvements in or relating to Cutting or Boring Tool Holders for
use in Lathes, Boring Machines, and Similar Machines.
I, HERMANN WIEGAND of 6, Brau Strasse, Leipzig-Plagwitz, in the Empire
of Germany, 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 annexed drawings which illustrate my invention Figure 1 is a longi-
tudinal section of the holder showing the gauging pin and the fixing screws
in elevation. Figure 2 is an end view of the holder supposing the pin with-
drawn. Figure 3 is a side view through the middle of the cutter, and Figure 4
is a lower view of the cutter.
This invention relates to a cutter holder which consists of the handle a, the
gauging-pin b, with conical pivot, two fixing-screws c and the cutter . The
apparatus is used as follows:-Let us suppose that it is desired to drill a hole
of 30 millimetres; it must be bored, to begin with, according to the gauging-pin b,
which is a millimetre less, using for this purpose either a suitable Drill or an
Auger.
After having withdrawn the Drill or Auger from the support, the outter-holder
is placed at e in the point or centre of the puppet, the gauging-pin b is introduced
into the previously bored hole and consequently the tool-holder is concentric and
parallel to the centre of the bored hole. The fixing-screws c afford a suitable
rest: these should be unscrewed sufficiently for then to rest firmly on the slide
support; afterwards the cutter-holder is fixed to the slide support with the help
of the clamping-tool, the puppet is withdrawn, the gauging bolt b is taken out
of the cutter-holder and the cutter is introduced into the slit of the latter.
In order that, from the start, the boring may be correct on both sides it is
necessary to insert the cutter slowly, in the hole prepared for it. The advance
of the cutter during the boring is effected by the guide-screw or directly by hand.
The cutter d is divided, the object being to allow of its being regulated to a
certain size, as becomes necessary owing to usage and to sharpening.
The two parts of the cutter are united by a cross piece d¹ screwed in a groove
formed on the lower face of one part of the cutter and extending on the other
part, the cross piece being arranged to slide in this part of the groove so as to
enable the two portions of the cutter to be removed or brought together. The
two parts of the cutter are held in their proper position by inserting a wedge
between them. The cutter is simply inserted in the slit of the handle a as
shown at d Figure 1 with its cutting edges extending laterally of the handle as
shown at Figure 2. The cutter need not be firmly fixed in the holder a, that is to
say, in the slit, but so that it can be easily guided therein..
This apparatus is advantageously employed in turning lathes, horizontal and
vertical boring machines, as well as in those machines the construction of which
allows of the setting of the tool by a back-centre.
A point, specially to be noticed, is the exact and yet simple way in which the

page_text: apparatus is regulated with regard to height by the screws and in a straight
line by the back-centre, or pin of the puppet, which engages in e.
Moreover the apparatus may be used any where, and it does its work so perfectly
that there is no need to finish it off with other instruments.
Having now particularly described and. ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is:-
A cutter-holder for lathes, boring-machines and similar machines distinguished
by a divided adjustable borer or cutter d as well as by fixing screws c and
changeable gauging-pin b for its exact adjustment.
ROBERT E. PHILLIPS, Assoc. M. Inst. C.E., M.I. Mech. E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Associate Agent.