Improvements in and connected with Lathe Chucks.
Year: 1899

page_text: Date of Application, 20th Sept., 1899
Complete Specification Left, 17th May, 1900-Accepted, 25th Aug., 1900
PROVISIONAL SPECIFICATION.
Improvements in and connected with Lathe Chucks.
I, HENRY LIEBERT, of Perseverance Works, Milnrow, in the County of Lan-
caster, Engineer, do hereby declare the nature of this invention to be as
follows:-
-
This invention relates to improvements in and connected with lathe chucks
and the object is to render the grip of the jaws instantaneous in a simple and
very effective way and which chuck may be readily applied to existing lathes.
According to one form of my invention when constructing an instantaneous
gripping chuck with jaws requiring a small range of adjustment or such as are
used to grip work of approximately one size only, I form the body or bed of
the chuck at two opposite points with two slots, in each of which I employ a
double ended lever. The front end of each of these levers is furnished with a
set screw adapted to be adjusted against the jaws of the chuck and be locked in
position thereon, whilst the back ends of the said levers are adapted to ride and
be acted upon by a cone placed loosely upon the shoulder of the headstock spindle
and boss of the chuck body or bed.
The said cone at its largest end is formed with a cylindrical surface and at
its smallest end with a rim adapted to be engaged by a forked lever suitably
pivoted to the headstock so that when drawing the said cone from the body or bed
of the chuck, by the aid of the said forked lever, the respective lever ends are
caused to ride onto the cylindrical part of the cone, which causes the jaws to
grip the work placed between the same, whilst on the return movement of the
cone, the respective lever ends drop and the jaws release the work.
The jaws employed in this description of chuck may be ordinary plain jaws or
of a special form, such as described in Letters Patent granted to me for improve-
ments in lathe chucks, No. 1086, dated January 16th 1896, and may be loose in
the body or bed of the chuck or held apart from each other by springs placed.
between.
By preference I lock the said set screws in position on the respective levers
by a split nut having a coned back, adapted to engage in a coned recess formed
in the said levers and the side of the jaws against which these set screws bear I
furnish with a steel incline to facilitate rapid adjustment of the jaws.
The arrangement of the fork, cone and levers described enables me to apply
the chuck to the spindle of the headstock close to its bearing and the whole
being very compact, the headstock spindle is greatly relieved from the strain
exerted upon the chuck.
According to another form of my invention when constructing a chuck with
jaws requiring a wide range of adjustment, I employ upon the body or bed of
the chuck, jaws adapted to be moved to and from each other by screw spindles,
the inner ends of which I furnish with bevel wheels arranged in gear with a bevel
wheel formed at the end of a short sleeve adapted to be partially rotated in the
headstock spindle but longitudinally stationary.
Behind the said sleeve I employ in the headstock spindle, a spindle projecting

page_text: through the back end of the headstock and in front formed with a square twisted
end engaging in a nut cast around the same and secured to the interior of the
said sleeve.
The back end of this spindle is engaged by a forked lever suitably fulcrumed
to the headstock to permit of moving the square twisted end of the said spindle
to and fro in the nut around it and thereby turn the same and its sleeve and
through the said bevel wheels and screw spindles, move the jaws of the chuck
in and out any required distance.
Dated this 19th day of September 1899.
:
Improvements in and connected with Lathe Chucks.
I, HENRY LIEBERT, of Perseverance Works, Milnrow, in the County of Lan-
caster, 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 relates to improvements in and connected with lathe chucks
and the object is to render the grip of the jaws instantaneous in a simple and
very effective way and which chucks may be readily applied to existing lathes:
And in order that my invention may be more fully understood I have caused
to be appended hereunto two sheets of drawings marked with letters of reference
indicating like parts in the various figures.
Fig. 1, Sheet I, is an end view, Fig. 2 a side view partly in section, Fig. 3 a
plan, and Fig. 4 a side view of one form of my improved instantaneous gripping
chuck, Fig. 5 an end view, and Fig. 6 a side view of another form of my improved
instantaneous gripping chuck.
•
Fig. 7, Sheet II, is an end view, and Fig. 8 a side view of a modification of
my invention.
In carrying out my invention and referring to Figs 1, 2 & 3, when construct-
ing an instantaneous gripping chuck with jaws requiring a small range of
adjustment or such as are used to grip work of approximately one size only,
I form the body or bed a of the chuck at two opposite points with two slots b,
in each of which I employ a double ended lever c. The front end of each of these
levers is furnished with a set screw d adapted to be adjusted against the jaws e
of the chuck and be locked in position thereon by a nut f, whilst the back ends
of the said levers are adapted to ride and be acted upon by a cone g mounted
loosely partly upon the shoulder h of the headstock spindle i and partly upon
the boss k of the chuck body or bed a, or entirely on either as will be readily
understood.
The said cone at its largest end is formed with a cylindrical surface and at
its smallest end with a rim m adapted to be engaged by a forked lever n suitably
pivoted to a boss o formed at the headstock p, see Fig. 1, so that when drawing
the said cone from the chuck body or bed a by the aid of the said forked lever,
the back lever ends ride onto the cylindrical cone part g, which causes the
jaws e to grip the work placed between the same, whilst on the return movement
of the cone g, the said lever ends drop and the jaws e release the work. The
jaws e employed in this description of chuck may be ordinary plain jaws, see
more particularly Fig. 1, arranged loose in the body or bed of the chuck and
held apart from each other by springs g placed between.
:'
7

page_text: In lieu of using jaws such as just described, 1 may employ jaws capable of
swivelling, such as described in Letters Patent granted to me No. 1086, dated
January 16th, 1896 and shown in Fig 4.
By preference I lock the said set screws in position on the respective levers,
by a split nut f having a coned back, see more particularly Fig. 2, adapted to
engage in a coned recess c¹ formed in the front end of the said levers and the
sides of the jaws e, against which the set screws & bear, I furnish with a steel
incline e', which quicken the movement of the jaws.
The arrangement of the fork, cone and levers described enables me to apply
the chuck to the spindle of the headstock close to its bearing and the whole
being very compact, the headstock spindle is greatly relieved from the strain
exerted upon the same.
According to another form of my invention and referring to Figs. 5 & 6, when
constructing a chuck with jaws requiring a wide range of adjustment, I employ
upon the body or bed a of the chuck, jaws adapted to be moved to and from
each other by screw spindles s, the inner ends of which I furnish with bevel
wheels arranged in gear with a bevel wheel formed at the end of the short
sleeve adapted to be partially rotated in the headstock spindle but longitu-
dinally stationary.
Behind the said sleeve I employ in the headstock spindle i, a spindle i pro-
jecting through the back end of the headstock and in front formed with a
square twisted end engaging in a nut cast around the same and secured to
the interior of the sleeve t.
The back end of the spindle i is engaged by a forked lever t¹ suitably ful-
crumed to the headstock to permit of moving the square twisted end of the
spindle to and fro in the nut and thereby turning the latter and its sleeve
and through the said bevel wheels and screw spindles moving the jaws in and
out any required distance
According to a modification of my invention I may form the type of chuck
shown in Figs. 1, 2, 3 & 4, so as to be readily applicable to any existing lathes
without necessitating any alteration therein whatever.
To this end, see Figs. 7 & 8, I mount the chuck upon a special or auxiliary
spindle mounted in a bearing ¹ which is independent of the headstock and
can be readily bolted to the lathe bed. Upon the back end of this spindle I
secure a carrier u² engaging in slots formed in a disc secured upon the head-
stock spindle whilst the cone g is mounted and adapted to slide on the boss
of the bearing u¹.
To permit of using the latter in conjunction with a loose headstock or turret I
provide keys w whereby the bearing can be raised or lowered, and to adjust the
same laterally I furnish its lower ends with set screws w¹ which engage between
the shears of the lathe bed, as shown in Fig. 7.
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:-
1st In and connected with lathe chucks, the chuck body or bed a furnished
with double ended levers c in combination with a sleeve g externally partly
coned and partly cylindrical, mounted around the axis of the chuck body or bed
and capable of being slid to and from the same, the front end of, the said levers
bearing against the jaws e, e' in the chuck body or bed and the back ends against
the said sleeve, which latter when slid from the chuck body or bed a causes
the levers c to force the jaws c, e¹ in and thus grip the work and when slid
away to release it, all substantially as set forth.
2nd. In and connected with a lathe chuck, a spindle employed inside of the
headstock spindle i adapted to be moved longitudinally to and fro and having
a twisted square front end engaging in a nut inside a sleeve t adapted to rotate
in the headstock spindle, the front end of which has a bevel wheel gearing

page_text: into bevel wheels s secured upon the jaw screw spindles s, s, all substantially
as and for the purpose set forth
Dated this I dev of May 1000
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester,
Agents to Applicant.