Improvements in Chucks.
Year: 1894

page_text: Date of Application, 29th Aug., 1894-Accepted, 20th Oct., 1894
COMIT DIE DE BULE
Improvements in Chucks.
I, CHRISTIAN FRITZ LORCH of 27 Untere Königstrasse, Bockenheim near
Frankfurt on Main, in the Empire of Germany, Tool 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:
My invention relates to an improved chuck for holding rings and other articles
having a similar shape, such as barrels besels etc., concentric in a lathe to enable the
Hitherto the want of a
outer edges or surfaces to be turned or otherwise worked.
practical chuck was much felt by means of which rings and such like articles of
various sizes could be easily and quickly centred so as to enable the workman to
work at or finish the periphery and other parts.
The invention is illustrated in the accompanying drawings in which
Fig. 1 shows in perspective the head stock and
Fig. 2 the improved head or chuck.
Fig. 3 is a sectional view of the spindle and head or chuck and
Fig. 4 is a sectional view of the head or chuck separately.
In all the figs. like parts are indicated by similar letters of reference.
The improved head or chuck a consists of a cone provided with external ring
steps, the smallest one being at the point of the head and gradually increasing in
diameter towards the back end or base of the cone. The head is mounted at one
end of the hollow stem b the other end being screw threaded. The head is split
into three equal portions by means of saw cuts said cuts extending a certain
distance along the hollow stem bas shewn in Figs. 2 and 4. The rear end of the
head a is formed with a hollow cone c into which fits the conical end d of the
sleeve e. This latter is provided with a stud e as shewn in Fig. 3 which fits a key
way shewn at Fig. 2 and thus prevents the stem turning in relation to the
sleeve e. The spindle is provided at its rear end with a hand wheel f¹ as usual
and is placed in the interior of the sleeve e. The end of the spindle is provided
with a female screw f' to fit the screwed portion of the stem b.
The sleeve e
forms in effect the spindle of the head stock and it has fixed thereon the cone
pulley g.
The hollow spindle has formed thereon near its rear end a shoulder f³
which takes a bearing against the rear end of the sleeve e so that when by means
of the hand wheel the spindle is turned in one direction the female screw f'
will screw further on to the screw of the hollow stem 62 of the head or chuck and
will thereby draw the latter rearward and by so doing will force the cone d into the
hollow cone c and thereby expand the head or chuck a whereby any article placed
on the ring step of the chuck suited to it will be firmly held thereon. On rotating
the hand wheelf' in the contrary direction the cone d will be partially withdrawn
from the cone c and the split portions of the head or chuck a will spring back to
their normal position and release the work.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
(1.) A chuck for holding rings and ring shaped bodies in a lathe consisting of a
conical head a formed with a number of external ring steps and having three or
more saw cuts in a radial direction through said head and extending a certain
distance along the stem, a sleeve e formed with a conical fore end fitting into the
hollow cone c of the head a and means for forcing the cone d into or withdrawing

page_text: it from the hollow cone c of the head or chuck substantially as herein shewn and
described and for the purpose stated.
(2.) The improved lathe chuck for holding rings and ring shaped bodies
substantially as herein shewn and described.
Dated this 29th day of August 1894.
E. P. ALEXANDER & SON,
Chartered Patent Agents,
19, Southampton Buildings, Chancery Lane, London, W.C.,
For the Applicant.