IMPROVED FACE PLATE AND LATHE CHUCK ATTACH
Year: 1885

page_text: I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of the said Invention for IMPROVED FACE
PLATE AND LATHE CHUCK ATTACHMENT a communication to me from abroad by
Edward Pement Esmond, Kingsbury County, Dakota to be as follows:-
This invention relates to a face plate and chuck attachment whereby any point
on the face of the work can be brought to the centre very easily and rapidly.
The attachment consists of three main parts, the body or boss which is screwed
on the mandrel of the lathe, an intermediate flanged disc, and a radially grooved
chuck plate carrying the jaws to hold the work, the chuck plate and intermediate
part being concentric with one another and mounted eccentrically on an eccentric
carried by the body or boss, the parts being adjustably connected together as
follows.
From the face of the body projects an eccentric circular part which has a screw
thread cut on its periphery and on which screws a ring or collar which is prevented
from unscrewing by a key pin or screw. Upon this collar is fitted a split spring.
collar or strap formed eccentrically on the rear face of the intermediate disc and
springing from the internal periphery of its flange, the ends of this split collar
being connected by a tightening screw by which it is clamped firmly around the
screw collar. Means are provided for turning the intermediate disc and screw
collar in order to move the intermediate disc to either side without endangering
the work when the spring collar is loosened. Upon the other face of the inter-,
mediate disc another split spring collar is formed which embraces a circular boss'
projecting from the rear of the face plate. A worm on a tangent spindle
mounted in the rigid part of the last mentioned collar, gears with teeth. cut on.
the periphery of the said projecting boss and enables the grooved face plate to be-
Price 8d1

page_text: adjusted rotarily on the intermediate disc when the said collar is loosened. The
face plate and the intermediate disc are connected by a central bolt made tubular
to permit a centre being used whenever required.
By moving the intermediate disc on the eccentric screw threaded part of the
main body or boss it is moved laterally and vertically at the same time.
COMPLETE SPECIFICATION.
Improved Face-plate and Lathe Chuck Attachment.
I, ALEXANDER MELVILLE CLARKE, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of this Invention (a communication to me
from abroad by Edward Pement, of Esmond, in the County of Kingsbury, Dakota
Territory, United States of America, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
The object of this Invention is to provide a new and improved Face Plate, and
Chuck Attachment, by means of which the operator is enabled to bring any point
on the face of his work to the centre very easily and rapidly.
Reference is to be had to the accompanying drawings forming a part of this
Specification, in which similar letters of reference indicate corresponding parts in
all the Figures.
Figure 1 is a side view of the improved face plate, and lathe chuck attachment.
Figure 2. is a front view of the same.
Figure 3. is a longitudinal sectional elevation of the same on the line xx,
Figure 5.
Figure 4. is a rear view of the front part, portions being broken out, and others
shown in section.
Figure 5. is a front view of the central part, portions being broken out, and
others shown in section.
Figure 6. is a rear view of the middle part, portions being broken out, and
others in section.
Figure 7. is a view of the inner side of the rear part.
The attachment is composed of three main parts A. B. and C.; of which the
part B. is in the middle; the part A is to be known as the rear part; and the
part C, as the front part. The part A is provided with a threaded bore C¹ in its

page_text: outer face to permit of screwing said part on the lathe spindle. On its inner face
the part A is provided with an eccentric projection D, which is passed into a split
.collar E, formed eccentrically in a recess on the rear surface of the central part B.
A screw F., is passed through jaws, or lugs on the ends of the split collar, and
extends to a recess G. in the rim of the central part B, the outer end of said screw
being squared, so that by turning said screw by means of a suitable key inserted in
the aperture G, the split collar will be opened and closed, and thus clamped on
the eccentric projection D, or disengaged from the same and thereby the central
part B can be shifted on the eccentric projection D of the part A, until part B
has the desired position, and can then be locked in place by turning the screw F.
A screw H is screwed through the central partition, or body of the central part B,
into the aperture G¹ formed in the centre of the eccentric projection D. The head
of said screw is countersunk in the front surface of said partition of the central
part B; and the head of the screw is provided with a slit or longitudinal recess I.
for receiving a screw-driver, key, or other implement for turning said screw.
A worm spindle J is mounted to revolve in the front part of the central part B,
and is provided with a polygonal, or squared head K which is in a recess L in the
rim of the part B, thus permitting of turning said screw by means of a key. The
worm-spindle is provided with an annu'ar groove M through which a pin N. passes,
to prevent the worm-spindle from shifting in the direction of its length. The front
part C is provided on its inner, or rear side, with a circular projection O. on the
rim of which the teeth P are formed which engage with the thread of the worm-
spindle J, said projection being passed into a recess in the front of part B. By
turning the worm spindle J the face plate C is revolved. A split collar Q is
formed on the front side of the central part B, and surrounds the inner part (which
is left plain) of the circular projection O, of the front part, and the ends of sid
split-collar can be drawn together or clamped on the projection O by means of a
screw R, screwed through the ends of said split-collar. A tubular screw S, is
screwed through the centre of the face-plate, or front part C, into the centre of the
middle part B. The face plate is provided with four radial T-shaped grooves T, in
which the sliding chuck jaws, or holders U. are mounted to slide in the usual
manner As stated above, the middle part can be adjusted on the part C, and then
locked in place. The front part C can be turned on the end of the central part B,
by turning the worm-spindle J, and after the said spindle has been adjusted; as
may be necessary, or desired; it can be locked in place by drawing up the screw R.
which will cause the split ring Q to clamp on the projection O, and thus lock the
part C in place.
Having now particularly described and ascertained the nature of the said
Invention; and in what manner the same is to be performed; I declare that what
I claim is
1. In a face plate, and chuck attachment, the combination with the part A
having an eccentric projection, of the part B, mounted to turn on the part A, and
the part C held on the part B, substantially as herein shown and described.
2. In a face plate, and chuck-attachment, the parts A. B. C, combined, sub-
stantially as herein shown and described.
3. In a face plate, and chuck attachment the combination with the part A
having an eccentric projection, of the parts B. and C, united in the manner set
forth, substantially as herein shown and described.
4. In a face plate, and chuck attachment the combination with the part A
having an eccentric projection, of the part B, having a split collar, and the part C
having a neck surrounded by said collar, substantially as herein shown, and
described.
5. In a face plate, and chuck attachment the combination with the part B, of a
worm spindle in the same, the part C having a projection the rim of which is
toothed, and engages with the worm spindle substantially as herein shown and
described.

page_text: 6. In a face plate, and chuck attachment, the combination with the part B
having the split collar Q of the screw R the worm spindle J in the part B, and the
part C provided with the projection O on the rim of which the teeth P, are formed,
substantially as herein shown, and described.
7. In a face-plate, and chuck attachment, the combination with the part A
having an eccentric projection D, of the part B, and a screw passed through the
part B. and into the projection D. of the part A, substantially as herein shown and
described.
8. In a face plate, and chuck attachment, the combination with the part A,
having an eccentric projection D, of the part B, having the split collar E, the
screw F for closing said split collar, and of the screw passed through the part B
into the projection D, on the part A, substantially as herein shown, and described.
D
37
+
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1000