Improvements in Expanding Mandrels. Page: 2 of 3
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122,920
UNITED STATES PATENT OFFICE.
JOHN P. SIMONS, OF HOUSTON, TEXAS.
IMPROVEMENT IN EXPANDING MANDRELS,
Specification forming part of Letters Patent No. 123,920, dated January 23, 1872.To all whom it may concern:
Be itknownthatI, JoHN P. SIIoNs, of Hous-
ton, in the county of Harris and State of Texas,
have invented certain Improvements in Man-
drels and Chucks for Turning-Lathes, of which
the following is a full, clear, and exact descrip-
tion, reference being had to the accompanying
drawing making part of this specification, in
which-
Figure 1 is a plan view of my mandrel and
chuck. Fig. 2 is a sectional view of the same
on the line x x of Fig. 1 Fig. 3 is a plan view
of the chuck detached. Fig. 4 is a sectional
view of the chuck aid mandrel on the line y
y of Fig. 1. Fig. 5 is a perspective view of the
collar i and washer o.
The object of my invention is to produce,
first, anexpanding mandrel which may be read-
ily enlarged or diminished to suit the size of
any annular article required to be turned in a
lathe. It also consists in adding to the man-
drel an expanding-chuck, by which the capac-
ity of the mandrel is increased to any desired
extent.
In the said drawing, A is a mandrel, provid-
ed with a screw -thread, a a., and has sunk into
it longitudinal inclined grooves b. Fitted in-
to these grooves are wedges B, having the in-
cline of their sides to correspond to the line
of inclination of the bottom of the grooves
from the line of the screw thread a. At their
thickest ends the wedges are provided with a
recess and shoulder, c. A nut, I), consisting
of two parts, d andI d', works on the screw-
thread a a. The part d' of the nut is reamed
out and fits over the shoulder c of the wedges,
thus forming a collar around them. The part
d of the nut is screwed into the part d', and
also has a female screw cut in it to correspond
with the thread a on the mandrel. Around
the mandrel, inside of the nnt D, is an anti-
friction collar, i, and the washer o. (See Fig.
5.) The faces of the collar and washer have
depressions an i it and it' a ' a', into which fit
the shoulders c of the wedges B. It will be
readily seen that by this arrangement when
the nut D is forced down the screw-thread a
a the wedges B, their heads remaining station-
ary in the collar i and washer o, are pushed
along the inclined grooves, and their upper
edges rise above the screw-thread a a. Myimproved expanding-chuck is placed upon the
mandrel and fixed in position by a set-screw,
1, through the flange e. The chuck consists
of a disk, N, made of metal or other suitable
material. Radiating from the opening in the
chuck for the mandrel to pass through are
wedges B', shaped as shown in Fig. 4. When
the chuck is in position each one of the wedges
B' at the center bears directly over one of the
wedges B onthe mandrel, andwhen the wedges
B are forced along the mandrel their upper
edges bear against the ends of the wedges B'
and press them outward equally. The disk
N is surrounded by a rim, P, made into see-
tions, the number of sections corresponding
to the ntunber of radial wedges. The sections
of the rim are recessed along their inner edges
and fit over corresponding shoulders in the
disk N, as seen at s s', Fig. 2, and have their
ends beveled from the periphery toward the
center at an angle like that of the heads of
the radial wedges. In the center of each sec-
tion of the rim is a recess, f, at the bottom of
which is a hole through which passes the large-
headed bolt t into the disk N, where it is fast-
ened with a pin, 2. Beneath the head and
around the bolt t in the recess f is a spiral
spring, 3, which bears against the bottom of
the recess and the under side of the head of
the bolt.
The operation is as follows: The chuck hav-
ing been fastened by the set-screw, any annu-
lar article to be turned is slipped over the
chuck, the nut D is forced down the screw-
thread, the wedges B run up' the inclined
grooves b, rise above the screw-thread a, come
in contact with the ends of the radial wedges
B' and force them outward. This forces apart
the sectional rim P and expands the mandrel
E equally in all directions until it fills and
holds the article to be turned. The bolts t
prevent the sectional rim from being forced
entirely away from the disk N, and the springs
3 serve to bring the sections of the rim back
against the disk N when the wedges B are with-
drawn and the pressure on the radial wedges
B' relaxed.
Having thus described my invention, what
I claim as new, and desire to secure by Letters
Patent, is-
1. The nut D, constructed substantially as
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Simons, John. Improvements in Expanding Mandrels., patent, January 23, 1872; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth165319/m1/2/?rotate=270: accessed June 24, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.