Year: 1887

page_text: Date of Application, 23rd Aug., 1887:
Specification Accepted, 25th Oct., 1887!
We, PETER SHELLENBACK, Engineer, and SAMUEL EDWARD SWAYNE, Accountant,
both of Richmond, in Wayne county, state of Indiana, United States of America, 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 pertains to lathes for boring and turning pulleys, and the invention
will be readily understood from the following description, taken in connection with
the accompanying drawings, in which-
Figure 1 is a front elevation of a lathe exemplifying our improvements, the tail-
stock, the chuck, the pulley held by the chuck, and portions of the head-stock and bed
appearing in vertical section, and the tool-post being omitted from the slide rest
nearest the spectator.
Fig. 2, a plan of the head-stock and of the left-hand ends of the rails.
Fig. 3, a face view of the crank Q, which effects the feeding motion of the rail-
screw, the feed-rods and the ratchet-arms of the rail-screws being shown in connection
therewith.
Fig. 4, an elevation of the inner face of the tail-stock, showing also the lathe-bed in
vertical transverse section; and
Fig. 5, a face view of the chuck with its clamping-ring.
In the drawings, A indicates the lathe-bed.
B, the head-stock constructed and secured to the bed, as usual.
C. the tail-stock rigidly secured at the tail end of the bed.
D, the arbor journaled, as usual, in the head-stock, and preferably bored through
its length to permit the passage thereinto of boring bars.
E, a spur-gear fast on the arbor.
F, another but similar spur-gear fast on the arbor.
G, a back shaft journaled in the head-stock to the rear of and parallel with the
arbor.
H, a spur gear splined upon the back shaft and arranged to mesh with gear F, the
spline permitting the gear H to be moved along its shaft, so as to mesh with or be
free from the gear, if so desired.
J, a pinion similarly splined upon the back-shaft and arranged to mesh with the
gear E.
K, a driving cone on the back shaft, by which motion is transmitted to the lathe
froin any suitable counter-shaft.
L, a pinion driven by gear E, and fitted to revolve freely on a shaft disposed below
the arbor.

page_text: M, the shaft just referred to, the same being journaled in the head-stock below and
parallel with the arbor.
N, a clutch upon the shaft, serving as a means by which the pinion L may be
locked to the shaft when it is desired that the shaft should turn with the pinion.
O, a shaft disposed longitudinally within the lathe-bed and journaled therein.
P, a pair of gears serving to transmit motion from the shaft M to shaft O.
Q, a feed-crank upon the inner end of shaft M, said crank being provided in a
common manner with an adjustable crank-pin, the crank lying just below the arbor
and against the inner end.of the head-stock.
R, a pair of rails supported by the lathe-bed, one rail at each side of the bed, these
rails being provided each with a slide-rest and feed-screw, as is common with rails of
metal-planing machines, and, frequently, of pulley-lathes.
S, pawl-and-ratchet mechanism, of the usual character, at the head-stock of the
rails, serving in effecting the intermittent rotation of the rail-screws to cause the
longitudinal traverse of the turning tools.
T, a pair of feed-rods, with their inner lower ends engaging the crank-pin of the
crank Q, and with their outer ends engaging the pawl arms of the pawl-and-ratchet
mechanism in the manner usual with such feed-rods as singly employed in connection
with metal-planing machines.
U, a tail-spindle, the same being fitted to both slide and revolve in the tail-stock.
V, a tail-screw for traversing the spindle, the same being provided with a hand-
wheel, by means of which the traversing of the spindle can be effected by hand,
and also with pawl-and-ratchet mechanism through which it may receive intermittent
rotation by power.
W, a feed-crank, similar to crank Q, upon the tail end of shaft O.
X, a feed-rod, reaching from this crank to the pawl-and-ratchet mechanism of the
screw V.
Y, a spur-gear splined to the tail-spindle.
Z, a spur-gear upon the shaft O, below the tail-stock.
a, a train of gearing, serving to transmit motion from gear Z to gear
Y.
b, a chuck secured to the end of the lathe-arbor, and provided with an axial bore
from the nose of the arbor outward.
c, an enlarged cup-shaped nose to the chuck.
d, a clamp-ring attached by bolts to the face of the chuck-nose.
e, a pulley secured in position to be operated upon by the tools, the arms of the
pulley being clamped between the clamp of the clamp-ring and the face of the chuck-
nose, one side of the pulley-hub entering the cup portion of the chuck-nose.
fa cylindrical boring-bar secured to the tail-spindle, and intended to rotate and
slide therewith.
g, a double-ended cutter of ordinary construction, secured in the boring-bar at
about its mid-length-as by means of mortise and key-in a well known manner;
and
h, a bushing in the outer end of the axial bore of the chuck, this bushing fitting and
serving to support the boring-bar.
Motion is given to the back shaft by a suitable belt, the gear H being moved along
the back shaft so as not to engage gear F, and the pinion J being moved along the
back shaft so as to engage the pinion E, as shown in the drawing, the back shaft
serves to impart motion to the arbor and to the pulley held by the chuck. The
revolution of the arbor gives motion to pinion L, and when the clutch N is thrown
into engagement with the pinion motion becomes transmitted to the crank-feed Q, and
through the medium of rods T oscillating motion is imparted to the pawl-arms upon
the ends of the rail. By this means the longitudinal feeding motion is imparted to
the slide-rest. Under the circumstances referred to the pulley may be turned by
lathe-tools in the two slide rests. The rails should be secured adjustably to the bed,
so as to be capable of being moved to and from each other according as pulleys
of large or small diameter are being operated upon, thus permitting the work to be
done with turning-tools projecting but a short distance from the tool-post. The rails

page_text: may of course be secured parallel to the axis of the lathe, so as to turn the face of
the pulleys straight; or the rails may be adjusted angularly with reference to the
axis of the lathe, so as to produce a crowning face upon the pulleys. These adjust-
ments of the rails are well-known devices in connection with pulley-lathes.
The manner of securing the pulley in the chuck will be obvious from the drawings,
the arms of a pulley being simply clamped between the clamp-ring and the nose of
the chuck. The nose of the chuck being faced off truly, follows that the finished
pulley as it revolves upon its axis will have its arins in a plane at right angles to
the axis of the pulley, it being assumed, of course, that the pulley will have its edges
trued while in the lathe. This manner of chucking permits of heavy cuts being
taken without danger of breaking the pulley. The pulley is being bored while being
turned. While the arbor and pulley is revolving slowly in one direction, the tail
spindle, with its boring-bar, revolves more rapidly in the other direction, the rotary
motion being effected through the shafts N and O and their connecting-gearing. At
the same time the end-wise feeding of the boring-bar is effected by the crank W
transmitting motion to the feed-screw V through the pawl-and-ratchet mechanism.
By throwing the clutch N out of engagement the rotary motion of the tail-spindle
is stopped. In case boring only is to be done, or in case very small pulleys are to
be turned, a greater speed can be given to the lathe-arbor by sliding pinion J out
of gear and sliding gear H into gear. By this means two changes of speed may be
scured in connection with each step of the driving-cone. As the boring-bar feeds
inward, its end is supported in the bushing h, and its end passes into the axial boro
of the chuck, and, if necessary, on into the bore of the arbor. Boring-bars,
boring-cutters, and bushings for the bar will of course he chosen of a size adapted
for the work in hand, the boring-bar being secured in the tail-spindle in a manner
cominon in attaching drills and boring-bars in the spindles of drilling and boring
machines.
Having now particularly described and ascertained the nature of our said Invention,
and in what manner the same is to be performed, we declare that what we claim is :-
1. In a lathe, the combination, substantially as set forth, with a bed, a head-stock,
an arbor, a tail-stock, and a slide-rest, of a spindle fitted to revolve and slide in the
tail-stock, a boring-bar secured to said tail-spindle, a shaft reaching from the head-
stock to the tail-stock, and gearing arranged to transmit motion from the arbor to
said shaft and from said shaft to said tail-spindle.
2. In a lathe, the combination, substantially as set forth, with a bed, a head-stock,
an arbor, and a pair of rails supported by the bed, of a shaft journaled in the head-
stock below and parallel with the arbor, gearing arranged to transmit motion from
the arbor to said shaft, a feed-crank upon said shaft below the nose of the arbor,
and a pair of feed-rods engaging said crank and the feed mechanism of the rails.
3. In a lathe, the combination, substantially as set forth, of a bed, a head-stock, an
arbor, a tail-stock, one or more slide-rests, a tail-spindle fitted to slide and revolve in
the tail-stock, boring-bar attached to the tail-spindle, a shaft journaled in the bed
parallel to the axis of the lathe, gearing arranged to transmit motion from the arbor
to said shaft and from said shaft to said tail-spindle, a feed-crank upon the tail end of
said shaft, and a rod engaging said feed-crank and a feed mechanism for the tail-
spindle.
4. In a lathe, the combination, substantially as set forth, of chuck b, having cup-
shaped nose e, clamp-ring d, and a lathe-arbor.
ALLISON BROS.,
Agents for the Applicants.