Improvements in Lathe Chucks.
Year: 1896

page_text: Date of Application, 16th Jan., 1896
Complete Specification Left, 15th Oct., 1896-Accepted, 21st Nov., 1896
Improvements in Lathe Chucks.
I, HENRY LIEBERT, of Ivy Villa, Victoria Park, Manchester, in the County
of Lancaster, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention has for its object to provide a chuck which is specially adapted
for use in the manufacture of three way taps and the like articles and which
permits of changing the position of the tap in the chuck more readily, accurately
and without having to withdraw the jaws.
To this end I fix upon the end of the lathe spindle in the usual way a plate in
which is mounted a spindle having a right and left hand thread. Upon each of
these threads I employ a nut, formed with a bed which projects from the said plate
and is adapted to receive a slide carrying a jaw between which the tap to be
operated upon is fixed.
The said slides are each furnished with a hook bolt by means of which they can
be locked to the said beds so as to move therewith when turning the said screw
spindle, or rendered loose thereon by releasing it from the grip of the said bolts
and thus be adjusted independently of each other.
The said jaws I adapt to swivel upon the said beds by forming each of the said
jaws with a pivot and each of the said slides with a hole to receive the said pivots,
the ends of the latter being furnished with a thread and nuts whereby the jaws are
secured to the said beds, a ball race being formed between jaw and bed to reduce
friction between the same.
The faces of the said jaws are formed hollow and with a V the former receiving
the body and the latter the branches of the tap.
One of the said slides is furnished with a spring bolt adapted to engage in holes
formed in the respective jaw in such a manner that when withdrawing the said
bolt any desired turn can be given to the jaw with the tap gripped between and
the said bolt riding upon the jaw automatically engages in the said holes and thus
retains the jaw securely in position whilst operating upon the tap.
Dated this 15th day of January 1896.
F. BOSSHARDT & Co.,
Agents to Applicant.
Improvements in Lathe Chucks.
I, HENRY LIEBERT, of Ivy Villa, Victoria Park, Manchester, in the County
of Lancaster, Engineer, 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 has for its object to provide a chuck which is specially adapted
for use in the manufacture of three way taps and the like articles and which
permits of changing the position of the tap in the chuck more readily, accurately
and without having to withdraw the jaws.

page_text: And in order that my invention may be more fully understood I have caused to
be appended hereunto one sheet of drawings marked with letters of reference
indicating like parts in the various figures.
Figs. 1 & 2 are respectively a front and side view partly in section of my
improved lathe chuck and Fig. 3 a plan thereof.
in
In carrying out my invention and referring to the figures generally I fix upon
the end of the headstock spindle a of the lathe in the usual way, a plate
which is mounted a spindle c having right and left hand thread. Upon each of
these threads I employ a nut d, forned with a bed d' which projects from the
plate and is adapted to receive a slide e carrying a jaw f between which the
tap (shown in dotted lines in Figs. 1 & 2) to be operated upon is fixed.
The slides e are each furnished with a hook bolt e¹ by means of which they are
locked to the beds d' so as to move therewith when turning the screw spindle c,
or be rendered loose thereon by releasing it from the grip of the bolts e¹ and thus
allow of being adjusted independently of each other.
The jaws I adapt to swivel in the slides e by forming each of the said jaws
with a pivot and each of the said slides with a hole e2 which holes receive the
said pivots, the ends of the latter being furnished with threads and nuts g whereby
the jaws are secured to the slides e, a ball race h being formed between jaw and
slide to reduce friction between same.
The faces of the jaws fare formed hollow and with a V, see Figs. 1 & 2, the
hollow part receiving the body and the latter the branches of the tap.
One of the slides e is furnished with a spring bolt i adapted to engage in holes k
formed in the respective jaw, in such a manner that when withdrawing the bolt i
any desired turn can be given to the jaws f with the tap gripped between and the
bolt i riding upon the jaw, automatically engages in the holes k and thus retains the
jaws securely in position whilst operating upon the tap.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim, is-
1st. In a lathe chuck, the nuts d formed with a bed d¹ adapted to receive a
slide e having a jaw which slide is rendered adjustable upon the said bed, all
substantially as and for the purpose set forth.
2nd. In a chuck constructed as specified in the preceding claim, the jaw f
rendered rotary adjustable in the slide e, substantially as and for the purpose set
forth.
3rd. In a chuck constructed as specified in the preceding claims, the use of a
ball race between the slide e and jaw f, all substantially as and for the purpose set
fortb.
Dated this 14th day of October 1896.
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester, Agents to Applicant.