Improvements connected with Turning Lathes.
Year: 1894

page_text: Date of Application, 6th Oct, 1894-Accepted, 10th Nov., 1894
Improvements connected with Turning Lathes.
I, RICHARD WAGNER, of 449 Stuttgarterstrasse, Boblingen, Wm temburg,
Germany, Mechanic, 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 mechanism for tmning courex pulleys and the like,
especially large sized pulleys and fly wheels, and it is characterised by extreme
Bimplicity The mechanism can be easily applied to lathes without subjecting them
to structural alteration.
On the annexed sheet of drawings which illustrates iny invention,
Fig. 1 is a side view partly in section of the device
Fig. 2 is a plan view with a part in horizontal section
Fig. 3 is a vertical section on the line - Fig. 2.
Fig. 4 shows a modification of Fig. 2.
Fig. is a detail plan view.
Fig. 6 13 a cross section on the line y-y Fig. 5
Fig. 7 shows the apparatus as it appears when fitted to a lathe
The main feature of the invention consists 10 30 guiding a two armed level
movably secured to the slide rest of the lathe and one arm of which carries the
turning tool, by the aid of a second lever also secured to the slide rest and
hence compelled to follow its motion, that, as the said slide rest is moved along, the
turning tool is bought nearer to or moved further from the mandrel according to
the amount of convexity which it is desued to produce on the surface of the pulloy.
The stroke of the second lever is produced by fixing one of its ends to the lathe bed
in such a manner that it cannot follow the slide rest in its movements
The invention is carried into effect or practice in the following manner.―
A hollow quadrilateral box or shell B which is fixed to the slide rest by means of
a clamp, S, las fulciummed on the bolt a in its front end a two armed lever A.
The front end of this levér has a clamp in which the turning tool W 18 secured
whilst its ear end has a recessed guide surface against which the roller F bears.
This roller F is carried on a bolt in the forked end of the lever C which latter
is pivotally connected by the pin & to the arm B' of the shell B. The oscillating
back end of the lever is provided with holes d through any one of which, as
desired, the pin on the forked end of the luk E can be passed. The opposite
end of the link is pivotted to any suitable part of the lathe bed
In the example shown at Fig. 7 the link E 18 secured to a block L by a
pivot pin G. A spring D (Fig. 2) bears at one end against the aim B' and at the
other against the end of the lever A in such inaume that the latter is constantly
pressed against the roller F.
The modus operandi is as follows:-After the shell B has been firmly secured to
the slide rest by the clamp S (Fig. 7) the apparatus is so arranged, that, when the
turning tool is in the central plane of the pulley requiring to be turned, the lever C
assumes a position (as shown) at right angles to the axial line of the mandrel. When
the slide rest is drawn back the lever C, moving on the pins and b, 18 drawn into
an oblique position relatively with the axial line of the mandrel as indicated by the
dotted line m', and, as a consequence, the roller F is caused to press the recessed
end of the lover A back against the action of spring D and thereby force its other
end forward, in this manner causing the tool W to approach nearer to the centres
of the lathe.

page_text: The movement on stroke of the lever 'C can be regulated by shifting the pin f
(and thereby the bar E) and the holes of the lever The greater the stroke the
greater will be the curve along which the tool is guided, that is to say, the greater
will be the convexity given to the pulley being turned.
After having in this manner properly set the tool the slide rest is moved forward
regularly so that the lever C gradually approaches a position at tight angles to the
axial line of the mandrel which it attains when the tool W has arrived at the
centre of the pulley as shown at Fig. 7. During this movement the tool has
gradually moved from its minimum distance from the line of the latho centies to its
imaximum distance from them, and, as a consequence, one half of the pulley has
been turned with a convex surface As the movement of the slide rest proceeds
the tool Wis agam gradually brought back agam from the maximum to the
minimum distance from the lathe centres and the other half of the pulley is, as a
consequence, turned with a convex surface. When the tuning of the pulley is
finished the lever C is in the position represented by the dotted line m³ whilst the
pin is at fo, the roller pin cat cº and the pin which moves in a line parallel with
the screwed spindle n, is at 6º.
It may be necessary with some constructions of lathe to fit the lever C on the
other side of the lathe bed, this may be effected in the manner shown at Fig 4. In
this arrangement the pin takes the place of the pin b, by which the lever is
pointed to the arm B, whilst the pin e' takes the place of the pin c, of the pressure
roller F The operation is exactly the same as before
Figs 5 and 6 show a modification of the lever C where a slot d takes the
place of the holes d (Fig. 2). The link Es secured to the lever by a
clamping bolt on screw e passed through the slot On slackening the nut of the
bolt e the link E can be shifted up and down the slot as desired in order to regulate
the amount of convexity desued to be given to the work.
A graduated scale may if desired be cut on the lever C in order to facilitate the
setting of the link E.
Having now particularly described and ascertained the nature of my said
invention and in what manue the same 18 to be performed, 1 declare that
what consider novel and desire to claim 18.-
1. The combination with a lathe of mechanism for turning convex pulleys and
the like characterised by a lever (A) so connected to the slide rest as to be free to
move thereon and one arm of which canes the turning tool whilst the other au
18 acted on, according to the convexity required, by a second lever (G) also
connected to the slide rest, substantially as hereinbefore set forth
2 The general arrangement and combination of parts of the mechanism
substantially as herein before described with reference to the diawings annexed.
Dated this 5th day of October 1894.
H. D. FITZPATRICK,
70, Wellington Street, Glasgow, Agent.