Improved Adjustable Tool-holder.
Year: 1899

page_text: Date of Application, 26th May, 1899-Accepted, 12th Aug., 1899
Improved Adjustable Tool-holder.
1, JOHANNES Bücш, of No. 8, Salstrasse, Winterthur, in the Republic of
Switzerland, Works Foreman, 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 object of the present invention is an improved tool-holder having a
revoluble and adjustable clip fitted in conically from below for the tool. This
plug is so constructed that the tool can be inserted either approximately verti-
cally, or approximately horizontally; an inclination of the tool of say 45°
would not produce a practically useful result.
In the accompanying drawings are illustrated various modifications of the
tool-holder forming the object of this invention:
Figure 1 shews a longitudinal section on the line A-A of Figure 2.
Figure 2 is a view from above.
Figure 3 is a view from above of another modification of the tool-holder.
Figure 4 shews a longitudinal section on the line B-B of a further modifi-
cation.
Figure 5 is a side elevation, and
Figure 6 is a view from above of the same.
The shaft a of the tool-holder (Figures 1 and 2) has at its front end an
aperture placed at an angle to the longitudinal axis of the shaft. In this
aperture or in its tapering prolongation the clip d is secured from below by
means of a suitably constructed screw bolt such as b, passing through it which
clip serves to hold the tool c approximately vertical in the position of use;
the screw bolt has a conical part e serving as a clamping device, which fits
into the conical prolongation of the aperture aforesaid. The clip together with
the bolt aforesaid is firmly held in the hole of the tool-holder shaft by means of
a nut placed on the upper end of the bolt b which is suitably threaded.
The tool is held in the clip d sideways to the axis of the screw bolt by means
of a suitable wedge and both tool and wedge are held firmly pressed against
the clip by means of a side clamping screw k. In the drawing the tool is shewn
of circular section, but of course the clip and wedge can be suitably shaped for
tools of other sections; thus for square tools, for instance, as shewn in Figure 3,
in which the clip d is shewn with two tools.
a
In Figures 4, 5, and 6 a tool-holder is shewn in which the tool can be fixed
in an approximately horizontal position in the clip. For this purpose it is
somewhat, differently constructed. It consists of a cylindrical screw bolt Z
passing through the tool holder shaft and having underneath the same
plate-shaped head mover which a conical clamping device n is adjustably
placed on the screw bolt 7. The clamping conen terminates above in a conical
apex and fits into the part of the hole of the tool-holder shaft which is conically
enlarged downwards, in which the screw bolt is situated. The tool can be
firmly fixed between the clamping device n and the head m, and for this
purpose the clamping cone has a recess at both sides which in combination

page_text: with a depression lying in the same plane in the head m forms the seating o
for the tool c. The lower rest for the tool in the recess in the head is under-
cut to correspond with the shape of the tool, (see Figure 5) so as to prevent
any sideways displacement of the tool in its seating.
The screw bolt is provided above with threading, whereby by aid of nut
9 it
can be firmly screwed up so that the bolt head is pressed against the conical
clamp n, and thus on the one hand, the tool is held firmly in its seating,
and on the other hand, the clamping cone itself is held tight in its place in the
shaft of the tool holder. The tool can thus be fixed on either side of the tool-
holder.
In this tool-holder with a rotary conical head or block inserted from below
the tool can be held to the work in any desired position and by means of the
tapering fit of the clamping cone the head with the tool is completely secured
against turning in consequence of the great surface friction of the tapering parts.
The same tool can be set not only with its edge in front but also towards
the right or left, as indicated for example by the arrows in Figure 2.
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―
1) A tool-holder, having a tapering clamping clip revolubly adjustable in
the shaft of the tool-holder, in which it can be firmly clamped, said clip holding
the tool sideways in such a manner that the same can be applied easily and
conveniently to any desired portion of the work.
2) A tool-holder, having a conical clamping clip revolubly adjustable in
the shaft of the tool-holder in which it can be firmly clamped, and carrying
the tool sideways, and so that the said tool can be held vertically or approxi-
mately vertically, and in which the conical tapering clamping clip forms a
single piece with the screw bolt.
3) A tool-holder having a conical clamping clip revolubly adjustable in the
shaft of the tool-holder and carrying the tool sideways whereby the tool can
be held horizontally or approximately so, and the clamping clip is placed
between the tool-holder and screw bolt head.
4) The improved tool-holder constructed and operating substantially as
described with reference to the accompanying drawings.
Datod this DR
W. P THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant.