IMPROVEMENTS IN SLIDE RESTS
Year: 1885

page_text: :
I, HEINRICH EHRHARDT, Civil Engineer, at Düsseldorf in the Empire of Germany,
do hereby declare the nature of said invention for IMPROVEMENTS IN SLIDE RESTS,
to be as follows:-
These improvements relate to slide-rests for turning tyres, discs and similar
pieces, and consist in the combination of three separate knives or cutters b, c and d
in a knife box a corresponding to the three surfaces to be worked the edges of
these knives being provided with recesses or notches, so that several cutting edges
act simultaneously and the respective surface is worked at the same time in its
whole breadth.
In the annexed drawing Fig. 1 represents a front view with a partial vertical
section, Fig. 2 a cross section and Fig. 3 a plan of the slide rest.
The knife holder a carries in front the cutters b c and d the edges of which are
provided with recesses, grooves or indentations, as shown by Figs 2 and 3 of the
drawing.
These grooves in the front edge of the cutters b, c and d produce a number of
edges which act simultaneously and give shavings separated from each other by the
grooves.
The cutter 6 which in the drawing is shown to work the cylindrical surface of a
tyre, is held in the required position by means of a wedge e; the knives c and d,
which act on the circular surface of the tyre are held in the required position by
the set screws ff. The three knives b, c and d are secured obliquely in the knife-
holder a, as shown by the drawing, and the knives c and d are held in position by
the set-screws g. g.
The knife holder a is moved towards and from the piece of work by the wedge
plate h and the set screws i and k.
The lateral shifting or adjustment of the knife holder a is caused by a spindle,
not shown in the drawing, whereby also the cutters e and d are shifted towards and
from the work piece. Besides, the knife holder a is pivoted on the frame or bed of
the lathe, by means of the intermediate piece m.
In working with the slide-rest, the cutter b which is to work the cylindrical
surface of the piece of work is advanced and the surface turned. Subsequently

page_text: the cutter b is removed and the lateral cutters c and d are conducted in the same
manner towards the piece of work for turning the circular surfaces or faces of the
latter. By means of these grooved knives, the pieces can be turned very quickly
and after this preparatory work, they are finished according to the required shape
with smooth, straight or fashioned cutters.
Improvements in Slide Rests.
I, HEINRICH EARHARDT, Civil Engineer, at Düsseldorf in the Empire of Germany,
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:
These improvements relate to a slide rest for turning tyres, discs and similar
pieces, and consist in the combination of three separate cutters b, c, and d in a
cutter box a corresponding to the three surfaces to be worked, the edges of these
cutters being provided with recesses or notches so that several cutting edges act
simultaneously and the respective surface is worked at the same time in its whole
breadth.
In the drawing filed with the provisional specification Fig. 1 represents a front
view with a partial vertical section, Fig. 2 a cross section, and Fig. 3 a plan of the
slide rest.
The tool holder a carries in front the cutters b c and d the edges of which are
provided with recesses, grooves or indentations, as shown by Figs 2 and 3 of the
drawing.
These grooves in the front edge of the cutters b, c and d produce a number of
edges which act simultaneously and give shavings separated from each other by the
grooves.
The cutter b, which in the drawing is shown to work the cylindrical surface of a
tyre, is held in the required position by means of a wedge e; the cutters c and d
which act on the circular surface of the tyre are held in the required position by
the set screws f.f. The three cutters b c and d are secured obliquely in the tool-
holder a, as shown by the drawing, and the cutters c and d are held in position by
the set screws g. g.
The tool holder a is moved towards and from the work piece by the wedge
plate and the set screws i and k.

page_text: The lateral shifting or adjustment of the tool holder a is caused by a spindle
not shown in the drawing, whereby also the cutters c and d are shifted towards and
from the work piece. Besides, the tool-holder a is pivoted on the frame or bed of
the lathe, by means of the intermediate piece m.
In working with the slide-rest, the cutter b, which is to work the cylindrical
surface of the piece of work, is advanced and the surface turned. Subsequently
the cutter b is removed, and the lateral cutters c and d are conducted in the same
manner towards the piece of work for turning the circular surface or face of the
latter. By means of these grooved cutters the pieces can be turned very quickly,
and after this preparatory work, they are finished according to the required shape
with smooth, straight or fashioned cutters.
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:-
In slide rests for turning tyres, discs and similar objects:
1. The use of cutters a, b and c having recesses or grooves for the purpose of
working simultaneously with several cutting edges.
2. The triangular arrangement of the cutters a, b and c in a tool-holder, for the
purpose of acting on three surfaces of the tyres, discs and other objects consecutively
with separate cutters a, b and c.
3. Cutters b, a and c rendered adjustable by means of key e and set screws f, f.
4. A tool-holder a rendered adjustable by means of wedge-discs h and set
screws and k.