Year: 1892

page_text: Date of Application, 16th Mar., 1892
Complete Specification Left, 16th Dec., 1892-Accepted, 28th Jan., 1893
Figure 4 snows a detail in section and plan, relating to the automatic stopping
device.
Figure 5 shows the round-turning device arranged for turning a hand wheel.
Figure 6 shows the same arranged for turning a wheel with flutings.
Figure 7 shows, as a modification, the stands h, hereinafter more particularly
specified, of the round-turning apparatus screwed direct on to the lower cross-
support of the lathe.
The round-turning apparatus is attached to the stand or support h, which may
have, preferably on its rear, a projection ¹, by means of which the whole apparatus
may be inserted in the tool holder of a lathe support (Figures 1 and 5) like an
ordinary turning tool, or may be firmly screwed on the upper slide rest u of the
lathe support (Figure 6) or even by means of a special support h² on the under
cross support of the lathe, Figure 7.
The slide rest is adjustable by means of the spindle hº on an exactly vertical
prismatic bearing of the stand h. The slide rest f carries the movably placed
axle a on one side of which the prism c is attached and on the other side the worm
wheel b. The slide rest d is adjustable by means of the spindle c° on the prism c,
which slide rest is shaped as a holder or clamping device for the turning tools.
If a ball is to be turned with this apparatus, the axle a is brought to the exact
level of the lathe centres ee by being adjusted upwards or downwards. By
revolving the axis a to the right or left, the tools describes by successive adjust-
ment a circle exactly concentric to the centre of rotation whereby the body inserted
in the lathe is turned into a ball k.
The tool & stands in this case above the lathe centre or the axis a and the size of
the ball is regulated by the adjustment of the tool towards or away from the axis a.
In order to fix this adjustment of the tool and thereby, in for instance wholesale
production, to produce any required quantity of articles of exactly the same size,
the spindle 7 is inserted sideways in the prism c, on which spindle are two nuts [í
which may be firmly clamped at any part of the spindle by being screwed one
against the other. As soon as d has reached its allotted end position, a projection m
fixed on the tool carrier d strikes against this stop thus formed.
The progressive movement of the tool necessary for turning, or the rotation of
the axle a, is produced by the revolution of the worm g which engages in the worm
wheel b, this revolution may be brought about either by hand by means of the
handle placed on the square part of the worm axle (Figure 2) or still better and
more evenly by means of a ratchet lever i resting on the worm axle. This latter
Price 1

page_text: (lever ) is provided at its end with holes in which the cord or chain of the
automatic shifting device found in most lathes may be attached. This cord or
chain draws the lever upwards in the direction of the arrow n, Figure 3, and thos
turns the worm or the worm axle with prism c and tool holder d respectively. If
the chain be again released, a weight suspended beneath draws the lever back again
in the direction of the arrow o, but without revolving the worm. This operation is
repeated automatically, and the turning tools would, if still moved forward,
eventually reach the spike carrying the ball, if the machine were not stopped in
time by the operator, or the further movement automatically interrupted by a
checking device. This checking device is shown in Figures 3 and 4. A trapezoidal
slot 6º is turned in the worm wheel concentrically to its centre, and in which the
similarly shaped lead of a screw p° is inserted. This screw serves to attach, at a
suitable part of the worm wheel, an angle piece p, provided with a set screw and
counter nut. If the apparatus has turned so far that the tool would shortly come
in contact with the spike, or, if the movement has to be interrupted at any given
point, the set screw of the angle piece p strikes against the ratchet lever i and
moves the same, as shown in dotted lines in Figure 3; in consequence of which the
stop catch of the ratchet lever cannot grip any more of the teeth, and the movement
of the turning tool is interrupted.
Before commencing the turning, the set screw of the angle piece p and the latter
itself on the worm wheel bare fixed at the proper place by trials with the hand.
For turning curved surfaces standing above the level of the lathe centres, for
instance, for hand or crank wheels r, Figure 5, the axle a is adjusted so high in the
supports that its centre line coincides exactly with the centre in cross section of
the round knob, and thus, on the axis a being turned, the tools will then describe
a circular course round the knob r¹.
For turning flutings, see Figure 6, the axis is arranged sufficiently high above
the fluting which is to be made, until the actual radius, to which the fluting is to be
turned out, is attained.
The cutting edge of the chisel must, however, in this case, always stand below
the axial centre line, whilst, as stated in the case of balls and knobs, the cutting
edge of the tools is situated above a.
The automatic operating and the automatic cutting off for limiting the working
may also be employed in cases like the last named.
Dated this 15th day of March 1892.
WM. P. THOMPSON & Co.,
Of 6, Lord Strect, Liverpool, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in and connected with Apparatus or Machinery for
Turning Materials.
I, CARL OTTO DOST of Breiteweg 124 Magdeburg-Neustadt, in the Empire
of Germany Machine 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 :-
This invention relates to a round-turning apparatus having a
horizontal
spindle which renders it possible to turn balls, hand-wheels and round parts of
machinery with concave or convex spherical surfaces without difficulty on any
ordinary lathe with any desired height of centres.
In the drawings filed with the Provisional Specification :-
Figure 1 is a front elevation of my improved round-turning apparatus adjusted
for turning a ball.
4

page_text: device.
Figure 5 is an elevation of the round-turning device adjusted for turning a
hand-wheel.
Figure 6 is a similar view, showing the same adjusted for turning a grooved
wheel, and
Figure 7 is a side view of a modification of a standard used in the machine.
Similar letters of reference indicate corresponding parts.
To one end of the axle a, the worm wheel b is attached, and to the other end
the block c. The slide rest d of the block e is arranged as a holder for the
turning tools, which slide rest is adjusted by means of the spindle co. The axle a
is horizontal and movably placed in the slide rest f. The slide rest is adjustable
by means of the spindle 7° on a vertical prismatic bearing of the standard . This
standard h is provided at its rear with a projection 7, by means of which the
whole apparatus can be inserted in the tool holder of a lathe support, as shown in
dotted lines in Figure 1, like an ordinary turning tool; or the said standard may
be firmly screwed on the upper sliding rest u of the lathe support, as shown in
Figure 6; or the turning attachment can be held by means of a special standard A
on the support of the lathe, as shown in Figure 7. If a ball is to be turned in
this apparatus, the horizontal shaft a is brought to the exact level of the lathe
centres ee by moving the same upward or downward in the standard h. By
revolving the shaft a to the right or left, the tools describes a circle, exactly
concentric to the centre of rotation, whereby the body inserted in the lathe is
turned into a ball k. The tools in this case stands above the lathe centre, or the
shaft a, and the size of the ball is regulated by the adjustment of the tool toward
or from the shaft a. In order to fix this adjustment of the tool and thereby to
produce any quantity of articles of exactly the same size, the spindle is inserted
laterally in the block c, which spindle is provided with two nuts 1, which may be
clamped firmly at any part of the spindle by being screwed one against the other.
As soon as the tool holder or carrier d has reached its allotted end position, a
projection m, fixed on the tool carrier d, strikes against the stop thus formed by
the nuts. The progressive movement of the tool for the purpose of removing a
continuous shaving from spherical articles, or the rotation of the shaft
duced by the rotation of the worm g which. engages the worm wheel b, which
rotation may be produced either by hand, by means of the handles placed on the
square part of the shaft of the worm, as shown in Figure 2, or better still and
more easily by means of a ratchet lever i on the shaft of the worm. This lever i
is provided at its end with holes, in which a cord or chain is inserted, which is
connected with a suitable automatic shifting device (omitted on the drawing as it
is found in most lathes). This cord or chain draws the lever upward in the direc-
tion of the arrow n, Figure 3, and thus turns the worm of the worm shaft with
the block c and tool carrier d respectively. If the chain be released, a weight
suspended beneath draws the lever i back again in the direction of the arrow o,
but without revolving the worm. This operation is repeated automatically, and
the turning tools would, if still moved forward, eventually reach the spindle
carrying the ball if the machine were not stopped by the operator or the further
movement automatically interrupted by a checking device. This checking device
is shown in Figures 3 and 4. A wedge-shaped groove 6º is turned in the face of
the worm wheel 6 concentrically to its centre, and in the same a similarly shaped
head of a screw p° is inserted, and this screw serves to attach, at a suitable part of
the worm wheel, an angle piece p provided with a set screw p¹ and a counter-
nut p. If the apparatus has turned so far that the tool will shortly come in
contact with the spindle carrying the ball, or if the movement is to be inter-
rupted at any given point, the set screw pl on the angle piece p strikes against the
ratchet lever and stops the same, as shown in dotted lines in Figure 7, in
consequence of which the pawl of the ratchet lever cannot operate any further and
the movement of the turning tool is interrupted. Before commencing the turning,
с
a,
pro-

page_text: the set. screw p¹ on the angle piece p and the latter itself are adjusted on the worm
wheel at the proper place, ascertained by trials made by hand.
For turning
knobs or roundings for instance, for hand or crank wheels r, Figure 5, the shaft a
is vertically adjusted so high on the standard h that its centre line coincides exactly
with the centre line in cross section of the round knob r', so that, when the shaft a.
is turned, the tools will describe a circular course around said knob r. For
turning grooves in the rims of wheels, as shown in Figure 6, the centre line of the
shaft a is arranged sufficiently high above the groove to be made until the actual
radius to which the groove is to be turned out is obtained. The cutting edge of
the tool must, however, in this case, always stand below the axial centre line,
while, as stated, in case of balls and knobs, the cutting edge of the tools is situated
above the axial centre line of the shaft a.
The automatic starting and the automatic stopping device for limiting the
working may also be employed as previously described.
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 round-turning apparatus with which it is possible to produce turned articles
according to exact convex or concave circular lines on any ordinary lathe with any
desired height of centres, consisting of a slide rest with the horizontal shaft a on
which the worm wheel b and block e are fixed, and the tool holder d adjustable on
the latter; in combination with the vertical standard / which is so arranged that
it may be gripped by the tool holder of any suitable lathe, as shown in
Figures 1 and 5, or may be screwed on the upper slide of the lathe support as
shown in Figure 6, which allows of the height of the shaft a being exactly
adjusted according to requirements, without further difficulty, to the height of the
centres of the lathe used.
2. The parts f, a, b, c, described in the Specification and in Claim 1, in combina-
tion with the standard h or h³, Figure 7, which is screwed on the slide of the lower
cross bar (to serve the same purpose as in Claim 1).
3. The automatic shifting round of the tool by means of the ratchet lever, in
combination with the automatic stopping by means of the checking device, whereby
the circular movement of the tool may be restricted at certain places when neces-
sary, such being capable of adjustment.
Deted this 15th dow of December 1800
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.