Year: 1886

page_text: I, HERBERT JOHN HADDAN, of 67, Strand, in the County of Middlesex, Civil
Engineer, do hereby declare the nature of this invention, a communication to me
from abroad by Edward Pement of Esmond, County of Kingsbury and Territory of
Dakota, United States of America, Manufacturer, 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 an improvement in Lathe Chucks and more particularly
to the improvement shown and described.
The object is to provide a chuck and face plate by means of which the work
secured thereto may be raised, lowered swung to the right or left and centred
without separating the different sections one from another, and in a quick and
effective manner.
With these ends in view the invention consists in certain features of construction
and combinations of parts as will be hereinafter described and pointed out in the
claims.
In the accompanying drawings, Figure 1 is a view of the face plate and chuck
in longitudinal section, Figure 2 is a front end elevation of the rear section,
Figure 3 is a front end elevation of the middle section and Figure 4 is a back
end elevation of the front section.
The device consists of three sections, the rear section A, the middle section B
and the front section C. The three sections when connected and adjusted on the
same axis have the appearance of a short regular cylinder. Their cylindrical form,
however is not absolutely essential, but is the form which is found most convenient
and economical in their construction.
The back or inner end of the section A is provided with a central female
threaded socket a adapted to receive the threaded end of a spindle D. The front
end of the section A is provided with a recess E, preferably, circular or nearly so,
and located eccentrically therein. To that portion of the wall of the recess E
which lies farthest from the centre of the section A, a split collar e is secured, its
ends approaching each other at a point nearly or quite in a line with the axis of

page_text: the section A, leaving sufficient space between the ends of the collar and the wall
of the recess E, to allow the said ends and portions of the collar adjacent thereto
to separate from and approach toward each other. The ends of the collar are
provided with perforated flanges e¹, the perforation in one of the flanges being
threaded and in the other smooth. A rod or bolt F provided along its middle
portion with a male thread f adapted to engage the threaded perforation in one of
the flanges el extends diametrically, or nearly so, through the section A and the
two flanges e¹. The ends of the rod or bolt F are squared to receive a crank or
wrench and preferably, project beyond the face of the section, far enough to afford
a convenient hold for said crank or wrench. The middle portion is further
provided with a collar or shoulder f¹ adapted to engage the outer face of one of
the flanges e, in which it rotates loosely, and thus serves when turned in one
direction, to draw the ends of the split collar toward each other and when turned
in the opposite direction to cause them to separate.
The back end of the section B is provided with a circular projection G
eccentrically located thereon and adapted to enter the portion of the recess E
surrounded by the split collar e when the latter is in open adjustment and further
adapted to be firmly clamped by the said collar e and thereby lock the section B
in the desired swinging adjustment. The projection G is provided with a female
threaded socket 9 centrally located therein, and adapted to receive a screw H
extending through a counter sunk perforation in the section A. The object of
the screw H is to hold the back end of the section B snugly in contact with the
front of the section A.
The front end of the section B is provided with a circular projection I located
on the same axis therewith, and provided with a concave face i. The concave
face is provided with a thread adapted to engage a worm as will hereinafter
appear.
The back end of the section C is provided with a circular recess K, concentric
therewith, and adapted to receive the projection I. A split collar & surrounds the
recess K its ends being forced toward and away from each other in a manner
quite similar to that hereinbefore described in connection with collar e, by means
of a bolt L the ends of which are squared to receive a crank or wrench for turning
it. The section C is further provided with a rod or shaft M which extends
transversely through the section, its middle portion projecting within the recess K
a distance equal to the depth of the groove on the face of the projection I. The
middle portion of the rod or shaft M is provided with a worm m which registers
with the thread . The rod or shaft is secured in its bearings against a longi-
tudinal movement but is allowed a free rotary motion, and its ends are squared to
receive a crank or wrench for turning it. The rotation of the said rod or shaft
thus causes the section C to rotate on the projection I as an axis, and it may be
locked in any desired rotary adjustment thereon by drawing the ends of the
collar k together. The section C is held in snug contact with the section B by
means of a screw N which extends through the centre of the section C and engages
a female threaded socket n in the centre of the projection I. The head of the
screw N is made hollow to receive a centering teat or point whenever desired.
The front end of the section C is provided with radial grooves O adapted to
receive chuck jaws or bolts for holding the work.
The advantages and use of the device may be briefly stated as follows:-By
loosening the screw H and the split collar c, the work may be raised lowered or
moved to the right or left by swinging the coupled sections B and C on the
eccentric projection G, and is secured in the desired adjustment by tightening the
said screw and collar. The work may then be centered by loosening the screw N
and collar and rotating the section C by means of the worm m on the rod or
shaft M.
It will be observed that the adjustments are simple and precise, and may be
made from the outside, while the sections are secured in their several positions
against all liability of displacement.

page_text: It is evident that slight changes might be resorted to in the form and arrange-
ment of the several parts described without departing from the spirit and scope of
the invention, hence I do not wish to limit myself strictly to the construction
herein set forth, but,
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, I declare that what
I claim is:-
1st The combination with the rear section the middle section adjustably secured
thereto and provided on its front face with a circular projection having worm teeth
on the periphery thereof, of the front section having a split collar on its rear face,
a screw bolt for adjusting the split collar, and worm shaft journalled in the front
section and engaging the teeth on the circular projection of the middle section.
2nd The combination with the front section the rear section having an eccentric
recess therein, and the middle section having an eccentric projection constructed to
rest within the recess of the rear section, of the screw passing through the rear
section into the eccentric projection of the middle section.
3rd The combination with the front section the rear section having an eccentric
recess in the front face thereof, a split collar located within said recess and a bolt
for adjusting said collar, of the middle section having an eccentric projection on its
rear face and a screw passing through the recess in the rear section into the
eccentric projection of the middle section.
4th The combination of the rear section having an eccentric recess therein, a
split collar located within the recess a screw for adjusting the split collar, the
middle section having an eccentric projection on its rear face and a concentric
projection on its front face, the latter having screw threads in the periphery thereof
a screw passing through the rear section, the front section having a split collar
adapted to embrace the projection on the front face of the middle section, a screw
for adjusting the split collar and a worm passing through the front section and
engaging the teeth on the projection of the middle section, substantially as
set forth.
5th The combination with one section provided with a recess eccentrically
located thereon, another section provided with a projection located eccentrically
thereon and a front section, of a threaded rod or bolt adapted to engage the free
ends of a split collar located within said recess, and a screw adapted to extend
longitudinally through the recessed section into engagement with the said
projection, substantially as set forth.
6th The combined face plate and chuck consisting essentially of the rear section
with its eccentrically located split collar, the middle section with its eccentrically
located projection adapted to be clamped by the said collar the outer section
adapted to be secured to the middle section in rotary adjustment and the
longitudinal screws for locking the sections against separation, substantially as
set forth.