Improvements in Lathes for Turning and Facing the Surfaces of Nuts, Bolt Heads, and other Objects.
Year: 1887

page_text: Date of Application, 2nd May, 1887.
Specification Accepted, 8th July, 1887.
Improvements in Lathes for Turning and Facing the Surfaces of
Nuts, Bolt Heads, and other Objects.
I, THEODOR BAUM of No. 30A Müller Strasse, in the City of Berlin, Germany,
Engineer, do hereby declare the nature of my invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement :-
My invention relates to improvements in lathes for turning, facing, and taking off
the burr from the front and rear surfaces of nuts, bolt heads and other objects, which
are fixed to suitable chucks removably attached to a chuck carrier or disc which can
be rotated. The holders or chucks for holding the pieces to be operated on are so
arranged that the finished nuts or other objects can be removed from the said holders
or chucks without in any way interrupting the operation of the lathe.
The cutters are fixed in the face plate which serves as tool or cutter carrier the
movement of which is automatically stopped as soon as the cutters have finished their
operation.
In the accompanying drawings,
Figure 1 is an elevation of my improved lathe.
Figure 2 is a view of the face plate and the nut holders, the bed of the lathe being
in section.
Figure 3 represents the cutter carrier and the cutters in elevation, side view and
top view.
Figure 4 is a top view of the gear for operating the support.
Figures 5, 6, 7, 8, and 9 are details of the parts of my improved lathe attachment
on an enlarged scale.
Figure 9 represents the excentric bolt in elevation.
The bed A of the lathe carries a standard B for receiving the chuck carrier D
which serves to receive the holders or chucks for the nuts, bolts or other piece of
metal to be operated on. The chuck or holder carrier D is provided with recesses D'
for receiving the projection or nose Q of the spring lever Q¹. Although my
improved lathe can be employed for operating on bolts and other objects by using
appropriate holders I will for shortness sake describe the application of the same
TD 077

page_text: to facing, turning off and taking off the burr in nuts of any size within the capacity
of the machine.
The chuck or nut holder E is at its rear end provided with suitable male
threads e so that the same can be screwed into the female threads in the chuck
'carrier or disc D.
The cylindrical part-d of the chuck or holder E is centrally bored out and also
provided with a square opening f, g, h, i, at a right angle to the central boring
(Figure 5).
The said boring and the opening f, g, h, i, serve to receive the parts 6¹ and
Y, the
rear half of the former being cylindrical and of like diameter with the boring in the
cylinder d and being squared off at its extreme rear end whilst the forward end 6' is turned
off, provided with screw thread and longitudinally slotted so that the said forward end b
can be contracted to suit the variations in the threadings of the nuts to be operated on.
The square block y which corresponds in size with the squared surface k l m n of the
part is provided with a transverse boring to receive an eccentrical bearing y¹
in which the excentrical bolt a¹ with the square headed extensions y³ is guided.
The
The female threads ys in the block y serve to receive the theads of a bolt w which is
introduced into the part b¹ and the conical head of which will spring the radially
slotted forward end 62 apart so as to firmly clamp the nut on the same.
square headed extensions y³ of the eccentrical bolt a¹ are guided in holes of the
plates d'e¹ f¹ g¹.
When the eccentrical bolt is turned by means of the square head y' the nut will
be firmly clamped to the chuck by the eccentrical bolt a¹ operating the part provided
with the female threads y³ into which the male threads w gear so that the tapered
bolt is drawn back and the jaws 6 of the chuck forced outwards.
In consequence of the chucks E being arranged in a circle concentrical to
the axis, any desired number of chucks and nuts can be employed which are
successively brought to stand immediately centrically to the axis of the tool or cutter
carrier G. The cutter carrier G which takes the place of the ordinary face plate
sits on the hollow spindle of the mandrel stock F and carries the holders for the cutters,
three of which a, b, c, are represented in the drawings.
The cutter a serves to remove the burr, the cutter b for turning the face of the nut
and the cutter c for turning off the corners of the same. The cutters b and c are
represented as located diametrically opposite to each other whereas the cutter a is
rectangularly arranged to the cutters b, c, although the same can be otherwise located.
The cutters b and c can be ordinary straight tools whilst the cutter a is hooked and
provided with suitable cutting edge. The base F¹ of the mandrel stock F is bevilled
off at the sides and is guided between corresponding jaws of the plate K affixed to
the bed. The movement of the mandrel stock in the guide plate K is effected by the
drum S¹ the spindle Z and gear wheels Z in the following manner. The foot F¹ of
the mandrel stock F carries at its one end a vertical shaft NO provided with an
eccentric P, worm wheel Q and hand wheel R. A one armed lever U¹ is provided
with a sleeve carrying a bevil wheel V₁ and a worm S which latter gears with the
worm wheel Q said lever being also in gear with a bevil wheel V on the shaft or
spindle Z by means of the bevil wheel V₁ attached to the sleeve of the said lever U¹.
If now the strap drum is caused to rotate this rotary movement will be transmitted
to the spindle or shaft Z by the gear wheels Z', through the bevil wheels V V' to the
worm sleeve S on the lever U¹ to the worm wheel Q and consequently to all the parts
connected to the vertical shaft. NO id est., the eccentric P, worm wheel Q and hand
wheel R, whereby the eccentric P will operate on the sliding foot of the mandrel
stock F and so move the parts connected to the same, the tool or cutter carriers G
and the cutters a b c, gradually towards the nuts to be operated on.
A pawl is connected to the sleeve carrying the worm S, the noses W T of the said
pawl being so adjusted that the bevil wheels V V are held in gear by the nose W,
whereas on the forward movement being completed and the surfaces of the nut
operated on finished, the nose T will be operated on by the pin or pivot U, the bevil
wheels brought out of gear and the parts automatically released. The hand wheel can

page_text: be so arranged that it will sound a bell for notifying the operator that the operation
is completed.
The operator now rotates the hand wheel R so as to return the mandrel stock and
all the parts carried by the same to their original position and the chuck carrier is
partially rotated so as to bring a fresh nut in front of the tools or cutters without
having to wait for the removal of the nut previously operated on. One great saving.
of time is attained in employing the arrangement of the chucks as beforementioned
and shown in the accompanying drawings, by not having to interrupt the work for
removing the finished articles.
I wish it to be understood that I do not confine myself to attaching the cutters or
tools to the rotary face plate on the mandrel, as it will be evident to all versed in this
branch of industry that the goods to be operated on can be fixed to the face plate
and the cutters attached to a disc D as shown, or to a fixed or adjustable standard in
such manner that the cutters remain stationary whilst the object to be operated on is
caused to rotate.
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 special lathe for facing and finishing off nuts, bolt heads and other objects, in
which the objects to be operated on are arranged on a moveable disc or chuck holder
concentric to the axis of the said disc or holder, in such manner that the finished
goods can be removed and replaced by unfinished articles without interrupting the
operation of the machine, substantially as described in the foregoing specification and
shown in the accompanying drawings.
2. Attaching or affixing the turning tools to a rotary disc or face plate on the
mandrel in such manner that the cutters are gradually and automatically advanced
to the object to be operated on by means of an excentric or its equivalent and the
advancing movement automatically stopped as soon as the operation is completed,
substantially as described in the foregoing specification and shown in the accompanying
drawings.
3. The construction application and employment of the chuck E for securely holding
the nut or other similar object to be operated on said chuck being screwed into or
fixed to the dise D the cylindrical part d of the chuck E being arranged to receive
the parts y and 61 for securely clutching or clamping the nuts or other objects
on the thread jaws 63 by the excentrical bolt a¹ in the part y drawing the bolt w towards
the interior of the clutch so that the conical forward end v of the bolt will force the
jaws 6 outwards and securely hold the nut or other object, substantially as described
in the foregoing specification and shown in the accompanying drawings.
4. The general construction and arrangement of the parts of my improved lathe or
any mere modification of the same, substantially as described in the foregoing
specification and shown in the accompanying drawings.
Datal thin and 1....
M1007
ALLISON BROS.,
Agents for the Applicant.