Improvements in Milling Machines.
Year: 1898

page_text: COMPLETE SPECIFICATION.
Improvements in Milling Machines.
We, CHARLES COIT TYLER, of No. 1, Flower Street, Superintendent, and CARL
LUDVIG GROHMANN, of No. 5, May Street, Designer, both of the City of Hartford,
County of Hartford and State of Connecticut, 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 relates to improvements in milling machines, and especially to
universal milling-machines, and it has for its main object the provision of an
improved machine of this class in which the movements of the travelling feed table
or carriage on which the work is mounted can be controlled more perfectly than
those in mechanisms of this kind as heretofore constructed.
Anotlier object is the provision of an improved device of this type capable of
adjustment to all positions in which it may be desired to set the work, whether the
latter be fed by hand or power-operated feed mechanism, and in which also the
connection of the driven parts with the feed mechanism can be maintained regard-
less of the adjustments of the index-head.
In the drawings, Figure 1 is a side elevation, partly in section, of a milling-
machine embodying this invention. Fig. 2 is an enlarged detail plan of a portion
of the machine, illustrating the swivel, the cross-feed slide, the reversing
mechanism, and the locking-lever for the reversing-lever, the feed-table or
traveling carriage being removed. Fig. 3 is a transverse section of the same with
the feed-table in place. Fig. 4 is a sectional detail illustrating the spring-pressed
detent for holding the reversing-lever in its central or idle position. Fig. 5 is
an enlarged vertical sectional detail illustrating the construction of the main
driving mechanism including the step-cones, the driving-spindle, the drawing-in
spindle, the arbor, and the connections between the step-cones and the main
driving-spindle. Figs. 6 to 9, inclusive, are details illustrating different positions
of the reversing-lever and the locking-lever therefor. Figs. 10 to 14, inclusive,
are details of the operating connections between the swivel and feed-table. Fig. 15
is a perspective view of our improved index-head operatively connected with the
feed-screw carried by the feed-table of the milling-machine. Fig. 16 is an
enlarged sectional front elevation of the same, the section being taken in line 2-2,
Fig. 17. Fig. 17 is a vertical central transverse section of the same, partly in
elevation. Fig. 18 is a central horizontal section of the same, partly in plan; and
Fig. 19 is a detail illustrating the manner in which the sleeve or bushing for the
indexing-spindle is clamped in place.
As to many of the features thereof the machine shown in the drawings of this
application and described in this specification is similar to milling-machines as at
present constructed. The several operative parts are mounted upon a main frame
or column (designated in a general way by F) rising from a base 2. At the upper
end thereof this frame is open and has a pair of side frames 3 and 31, connected
at their upper ends by a long bearing 4, in which may be secured a swinging
arm 5, having at the outer end thereof a bearing for the main arbor 6. The main
011

page_text: driving-spindle 7 is journaled at its opposite ends in suitable bushed bearings
in the side frames or uprights 3 and 31 At the front end thereof this main
driving-spindle is tapered at 74, and hence the bushing 81 is correspondingly
tapered internally while at the rear end thereof said spindle has splined thereon
a tapered sleeve 9, journaled in a correspondingly-tapered bushing S. The
spindle is screw-threaded near its rear end to receive an adjusting-nut 10 by
means of which wear on the parts may be taken up from time to time. (See Fig. 5.)
For the purpose of excluding dust from the two bearings of the main spindle
we have shown at 12 and 121 collars encircling the bushings and the adjacent
portions of the spindle. At its front end the spindle 7 is also screw-threaded at 711
to receive a face-plate, and a milled collar-nut or cap 13 will ordinarily cover such
threaded end.
In connection with the driving-spindle 7 we may employ a drawing-in spindle 14,
which will preferably be tubular and have internal threads at its forward end, so
that it may engage the correspondingly-threaded end of the main arbor 6, which
is to be rotated by the spindle 7. This main arbor will preferably be tapered
and will enter a tapered opening at the forward end of the spindle 7; the arbor and
the spindle being suitably keyed together as shown, for example, in Fig. 5. At
the other end thereof the drawing-in spindle 14 has keyed thereto a hand-wheel 15,
while the driving-spindle 7 carries a driving-pulley 16 for transmitting the
movement of the main spindle to the several working parts below the same.
The
In Fig. 5 we have illustrated an improved construction for connecting the
step-cones (designated in a general way by C) to the driving-spindle 7.
essential feature of this connection is a duplex-fastening device the main member
of which is in the form of a tubular screw 18, screwed to one of the rotary members,
preferably to the step-cones and adjustable therein, while the other member of
the fastening device is carried by the main member or screw 18 and may be in the
form of a screw-bolt 19, journaled in the screw 18 and threaded into a spline 20,
carried in a key-seat 21 of greater depth than the spline. Two of these fastening
devices are illustrated herein, and it will be seen that the outer screws 18 may be
adjusted to lock the spline in any desired position in its seat, while the screw-
bolts 19 will hold the spline firmly in place when it is adjusted properly.
The connections between the main driving-spindle and the feed-table on which
the work is carried are clearly shown in Fig. 1. From the driving pulley 16 a
belt 25 passes to one of a pair of step-cones con a shaft 26, carrying a second
set of cones c¹, any one of which may drive a belt 27, which passes around one of
another set of cones con a driving-shaft 28, passing through the frame of the
machine to the front thereof and journaled therein near the base 2. At the forward
end thereof the shaft 28 carries a bevel-pinion 29, which meshes with a bevel-
gear 30, splined on a vertical shaft 31, so as to slide freely thereon. This shaft 31
is journaled at its lower end in a housing 32, connecting the main frame F and a
hollow post 33, rising from the base 2, and at its upper end in a suitable bearing
on the vertically-adjustable carrier or knee of the machine, which carrier or knee
is designated in a general way by K. At its upper end the shaft 31 carries a
bevel-pinion 34, which is held against vertical movement relative to the knee 4
by suitable stop-shoulders, said pinion meshing with a spur-gear 35, secured to a
horizontal shaft 36, mounted in bearings on the knee K. One of the bearings for
this shaft is carried by the usual cross-feed slides mounted on the knee so as to
travel thereon in a line parallel with the longitudinal axis of the horizontal
shaft 36. The movable bearing for said shaft is formed in a block or hanger 37, 5
depending from the cross-feed slide, and in this bearing a bevel-gear 38, having a
long hub, is journaled, as shown in Fig. 3, so as to travel with the cross-feed slide
while rotatable in said hanger.
It will be understood, of course, that the bevel-gear or pinion 38 should slide on
the shaft 36, and hence the latter has extending therealong a key-seat 36', so 5
as to assure the rotation of the bevel-pinion 38 regardless of the movement of
said bevel-pinion along said shaft. The forward end of the horizontal shaft 36

page_text: is journaled in a bracket or hanger 40, depending from the forward end of the
knee, and at the lower end of this bracket the forward end of a rotary feed
member 41 is journaled, the rear end of said feed member or shaft being mounted
in any suitable bearing on the body portion of the knee. At its rear end the
shaft 41 carries a bevel-pinion 42, which meshes with a bevel-gear 43 on the upper
end of the usual elevating feed-screw 44, the lower end of which passes through a
threaded nut 45, fixed in the upper end of the tubular post 33. It will be obvious
that, by means of a crank applied to the forward squared end 41' of the shaft 41,
the elevating-screw may be turned and the knee raised or lowered to adjust it to
any desired height, this knee, of course, sliding in the usual manner on a way 46
on the forward side of the main frame or column F.
In connection with the parts just described we have also shown the usual gage-
rod 47, passing through a bore 48', in a bracket 48, projecting laterally from the
post 33, this gage-rod having the usual adjustable stops 49 and 49¹.
As before stated, the cross-feed slide is slidable in the usual manner on the
knee K, and for the purpose of locating said slide with precision we have shown
at 50 the usual cross-feed-slide adjusting-screw, by means of which a micrometric
adjustment may be obtained. This slide also has a vertical journal-bearing 51,
the vertical axis of which intersects the longitudinal axis of the horizontal shaft 36.
This vertical bearing is adapted to receive a vertical shaft 52, the extreme ends of
which are reduced slightly to form stop-shoulders in alinement with the ends of
the bearing 51, and on these reduced portions are secured a pair of bevel-gears,
the lower of which, 53, meshes with the bevel-pinion 38 and is driven thereby,
while the upper gear, 54, is adapted to operate the feed-screw carried by the
swivel.
The swivel is mounted for rotation on the cross-feed slide and has its axis of
rotation coincident with the axis of the vertical shaft 52. This swivel is designated
by s, and has a pair of bearings 55 and 551, in which the main feed-screw,
controlling the movements of the feed-table, T, is supported for rotation. The
connection between this feed-screw and the table may be obtained by passing
the feed-screw through a fixed lug 55 on the swivel.
The feed-screw is designated by 56 and has a long groove or seat for a spline, by
means of which a clutch member, 57, is secured to the feed-screw for rotation
therewith while sliding freely therealong. This construction is illustrated clearly
in Figs. 2 and 3.
In Figs. 10 to 14, inclusive, I have illustrated in detail the manner in which
the connection between the swivel and the feed-table is effected. This feed-table
has at one end a detachable bearing, and this may be detachably secured to the
main part of the feed-table by means of screws. "This detachable bearing has a
journal-opening for the reception of the smooth journal portion 561 of the feed-
screw; and it will be clear that by turning the handle the feed-screw may be
withdrawn readily from said bearing.
The connection between the smooth end 561 of the feed-screw and the other
operating-handle or ball-lever may be obtained in the manner indicated in detail
in Fig. 13, in which the feed-screw has a supplementary portion 56", to which
the part 56 is keyed, the ball-lever being secured to the extreme outer end
of the part 56¹¹.
It frequently happens that it is desirable to turn the feed-table to such an
extent that the latter, if constructed in the ordinary manner, would strike against,
and would be stopped by, the main upright or some other part of the framework,
but, by providing the detachable bearing b, it will be evident that the latter may
be unscrewed from the end of the main portion of the feed-table and the handle h¹
withdrawn from the feed-screw, whereupon the feed-table may be swung to the
position shown in Fig. 11, and hence move substantially, if not quite, in a com-
plete circle. This construction also permits of the withdrawal of the feed-screw
from the detachable bearing 6 without removing the latter from the table proper.
The clutch member 57 forms one element of a reversing driving mechanism, by

page_text: means of which the feed-screw may be rotated in either direction from the bevel-
gear 54. The usual bevel-gears 58 and 581 in mesh with the gear 54 are employed
for the purpose of rotating this feed-screw in the one direction or the other, these
bevel gears being journaled in the bearings 55 and 55 and having longitudinal
bores or journal-openings in alinement with the corresponding bore in the clutch 5
member 57, through which openings the feed-screw passes.
The clutch member 57 is peripherally grooved, as shown in Figs. 2 and 3, and
in this groove is seated a bifurcated collar, the two members 60 and 60' of which
are connected with the opposite ends of the forked portion of the usual reversing
arm or lever R, this collar being divided in this manner in order to permit the 1
parts to work freely while maintaining a tight joint. The reversing-lever may
be pivoted on the swivel in any suitable manner, it having, preferably, opposite,
rounded bosses 61, projecting from the sides thereof and held between parallel side
walls 621 formed in a detachable block 62, secured to the swivel.
For the purpose of clamping the swivel in any desired adjusted position I prefer
to employ the devices shown in detail in Figs. 2 and 3. In the construction shown
therein the swivel has a peripheral groove 65 near the under side thereof, and the
cross-feed slides has a circuit of vertical seats for the reception of studs 66, by
Each of these studs
means of which the swivel may be clamped to the slide.
preferably has a mutilated head 661, adapted to engage the lower wall of the
peripheral groove 65, so as to draw the swivel down toward the slide s. Each stud
is also bored horizontally in alinement with corresponding bores in the slide for
the purpose of receiving a cam-bolt, by means of which cam-bolt 67 the stud
will be wedged in place to clamp the swivel and the slide together. Each of these
cam-bolts may be secured against longitudinal movement by a set-screw 68,
working in a peripheral groove 671 in the bolt.
The lever R is a combined stopping-and-reversing lever and, in controlling one
of the movements of the feed-screw, moves from an idle to a working position, and
vice versa, to shift the clutch member 57 into position to start the rotation of the
feed-screw or to stop the latter. As the feed-screw is intended to rotate in both
directions the reversing-lever should, of course, be shiftable from a central, idle
position to a working position at either side of such idle position, in order that
the clutch member may be thrown into engagement with one or the other of the
When in its
bevel-gears 58 and 581, or disengaged from both of such gears.
normal, idle, central position, the reversing-lever may be held by suitable yielding,
holding means such, for example, as a spring-pressed detent.
A device suitable for this purpose is illustrated in detail in Fig. 4, in which 70
designates a pin having a substantially V-shaped nick in its head, and 71
indicates a spring-pressed pin having a V-shaped point adapted to take into
the correspondingly-shaped nick in the pin 70, when the reversing lever is in its
central position. The pin 71 is preferably hollow and normally held by a light
spring 72, this spring-pressed pin or detent being mounted on a block 73 secured
to the swivel s¹.
In the operation of milling-machines as heretofore constructed it has been
customary, so far as we are aware, to shift the reversing-lever directly from its
idle to its working position, and to return it in the same manner, no provision
being made in such machines for locking the reversing-lever in a working position
to prevent the premature, accidental return of the same to an idle position. More-
over, in all of these machines the movement of the feed-table has been positively
limited by some suitable stopping mechanism, so that the feed-table could not be
fed past the stop.
In the present case, however, the provision of suitable means for locking the
reversing arm or lever in its working position until the feed-table reaches the end
of a predetermined range of movement, and of means for enabling the feed-table
to be fed past the stop for limiting the movement thereof, constitute two of the
leading features of our present improvements.
While we consider within the scope of our invention any suitable means for

page_text: ocking the reversing-lever in a working position until such locking means is
released, we have illustrated herein for this purpose a locking-arm L disposed
substantially transversely to the reversing or stopping lever R.
The locking-lever L is intended to hold the reversing-lever locked in either of
its working positions and has thereon a fixed stop member 80, positioned to
co-operate with a fixed stop 81 on a stop-arm 82, projecting from the reversing-
lever. In the construction shown the locking-lever is located above the reversing-
lever and the locking-arm 82 of the reversing-lever is a separate member secured
to the reversing-lever and disposed between it and the locking-lever. Each of the
stop members 80 and S1 has three stop-faces, the stop-face 801 on the locking-lever
co-operating with the stop-face 81' on the reversing-lever to hold the latter locked
in its left-hand position (shown in Fig. 6) and the stop-face 801 co-operating with
the stop-face 8111 to lock the reversing-lever in its right-hand position, as shown
in Fig. 9, while the stop-face 8111 of the reversing-lever engages the stop-face 80111
of the locking-lever, when the former is in its normal, central position, to limit
the movement of the locking-lever and prevent the locking of the reversing-
lever. The locking-lever will preferably be spring-pressed, as shown, at 85,
Fig. 2, so that when the reversing-lever is shifted either to the right or to the left
and the stop-face 801 released from the holding-face 811 the locking-lever will
be automatically actuated by the spring to carry one of its locking-faces 81 or 8011
into position to lock the reversing-lever in the corresponding working position
thereof. It will be noticed that the stop-faces 80111 and 81111 are disposed obliquely,
in order that they may coact properly when the two levers move about their
pivots.
The locking means for the reversing-lever is also intended to operate as a means
for actuating the reversing-lever to return the latter to its normal, idle position,
and in the present case the locking arm or lever L constitutes reversing-lever-
actuating means which may be operated either manually, by the shifting of the
locking-lever in the opposite direction to that which it is moved to lock the
reversing-lever, or automatically, in a similar manner, by a stop on the feed-table.
The actuating member proper is indicated herein at 86 and is in the form of a
pin fixed on the locking-lever and movable therewith. The upper end of this
pin, which is designated by 861, is intended to be operated by the stop on the
feed-table, while the lower end is intended to coact with a suitable face or faces on
the reversing-lever.
Either one of the levers may have a suitable cam-face or faces adapted to
co-operate with the other lever to cause the return of the reversing-lever from a
working to its idle position, but in the present case the lower end of the actuating
member or pin 86 has a pair of independently-effective cam-faces, (designated
by 86 and 86111,) co-operative, respectively, with a pair of corresponding cam-
faces 821 and 82111 on the locking member 82 of the reversing-lever. The cam-
faces 8211 and 82111 are disposed at a suitable distance from each other, correspond-
ing to the range of movement of the reversing-lever in moving from one working
position to the other, and those two faces 8211 and 82111 are suitably separated, as,
for instance, by a recess 87 in the locking-arm 82.
The several cam-faces just described are so disposed relatively to each other that,
when it is desired to unlock the reversing-lever and return it to its idle position,
the co-operative cam-faces of the two levers will coact to shift the reversing-lever.
For example, in Fig. 6 the reversing-lever is shown locked in its left-hand position.
In Fig. 7 the reversing-lever is unlocked, owing to the partial shifting of the
locking-lever, and the cam-face 861 is in contact with the cam-face 82111 of
the reversing-lever, ready to shift the latter back to its central position when the
locking-lever is returned to its normal position. (Shown in Fig. 2.)
It will be noticed, also, that the locking member 80 and the actuating member 86
are so disposed relatively to each other, and to the stop-face 81 and the cam-
face 821 of the reversing-lever, that as soon as the reversing-lever is shifted to a

page_text: working position it will be controlled by the locking-lever, while, when it is
returned to its central position, it limits the movement of such locking-lever.
It will be evident, therefore, that while the reversing-lever may be shifted at
any time to either of its working positions from an idle position, yet it cannot be
returned from either working position to its idle position until the locking-lever
is operated. Moreover, this locking-lever when so shifted constitutes an actuating-
lever by means of which the reversing-lever will be returned to its idle position
without manipulating the reversing-lever directly by hand.
In order that the action just described-viz., the return of the reversing-lever to
its idle position-may be effected automatically, and the rotation of the feed-screw
stopped, the feed-table should carry therewith in its movement a suitable stop or
stops, such, for instance, as illustrated at 90. (See Fig. 3.) This stop is preferably
removably secured to the feed-table by a T-and-slot connection, in such a manner
that the stop or stops will be adjustable to any desired point along the feed-table.
The stop 90 preferably has beveled or cam-faces 90' and 90", adapted to co-operate
with the rounded head 86' of the pin 86 on the locking-lever. The actuating member
or pin 86 constitutes a stop member movable relatively to the stopping or reversing
lever, and this stop member or actuating member is intended to be shifted by
the stop 90 transversely of the path of movement of such last-mentioned stop
and out of such path of movement. (See Fig. 8.) Hence the member 86 is a
stopping-arm-actuating or reversing-arm-actuating stop member carried indepen-
dently of the stop-arm of the reversing-lever R, and is operative for returning
such reversing-lever to its idle position.
As this stop member 86 is shiftable out of the path of movement of the stop 90
it will be seen, also, that the feed-screw 56 may be turned by hand, if desired, and
the stop 90 fed by, or past, the stop 86 without loosening or removing either of
such stops, thus rendering it possible to employ a plurality of stops on the feed-
table, similar to that shown at 90, each of which in turn may be fed past the
stop 86.
For the purpose of properly adjusting the work (not shown) carried by the feed-
table relatively to the tool (not shown) supported by the arbor 6, suitable indicating
devices are employed.
In order to control the position of the swivel, the cross-feed slide has thereon
a scale 100, concentric with the axis of rotation of the swivel, and the swivel
carries a pointer 101. (See Figs. 1 and 3.)
The adjusting-screw 50 and the adjusting-shaft 41 also have indicating devices,
the former to determine the extent of the cross-feed movement of the slide s, and
the latter to regulate the vertical adjustment of the knee K. Thse two indicating
devices are designated, respectively, by d´and d', and as they are substantially
similar in construction a description of one will suffice for both.
Referring particularly to Fig. 3, 105 designates a micrometer-dial having an
internal flange or shoulder 1051, adapted to abut against a stop-shoulder 50¹ on
the outer end of the adjusting feed-screw 50, and 106 designates a washer splined
on the feed-screw, so as to rotate therewith while movable longitudinally of said
screw. Near its forward end this feed-screw is externally threaded, as at 5011, to
receive an internally-threaded collar 107, by means of which the dial is secured
in position. When the collar 107, which is not in contact with the dial, is screwed
tight, it will force the washer 106 against the face of the dial and bind the latter
against the stop-shoulder 50', it being obvious, of course, that the rear side of the
dial clears the forward face of the bracket 40, so that it will not be in frictional
engagement therewith but will turn with the adjusting feed-screw. When it is
desired to obtain a fine adjustment of the cross-feed slide or of the knee, the collar
of the proper micrometer-dial should be loosened and the dial proper turned to the
zero position; after which the collar or cap should be screwed tight and the adjust-
ing feed member turned the desired distance.
"
The index-head; which is designated by I, will be mounted upon the feed-
table T. The feed-screw for imparting transverse movement to the feed-table T

page_text: carries thereon a gear 108, by means of which- the rotary movement of the feed-
screw may be transmitted to the work-holder on the index-head. Any suitable
intermediate driving mechanism may be employed for this purpose, but in the
present case the pinion 109 meshes with the teeth of one of a pair of gears 110
and 110, the latter of which-drives, in turn, another gear 111, supported by a
bracket 112 on the table T, which bracket has a long journal for a shaft or
spindle, such as 113, passing through the gear 111 and on which shaft said gear
is splined. This driving spindle may be connected by means of a key-and-slot
connection with the enlarged portion 114 of a short shaft 114, journaled in a
bearing 115 in the lower side of a casing C¹, secured to-the-fixed body portion of the
index-head. This casing. may be made in two parts -116 and 116 suitably bolted
together. The part 116 forms at 115 a bearing for the shaft 114, and the other
member 116 of the casing forms at 116 a bearing for another short shaft or
spindle 117, disposed in parallelism with the shaft 114 and having its axis of
rotation intersecting the axis of movement of the movable member or head of the
index-head.
The two shafts 114 and 117 carry, respectively, gears 114" and 117", which are
completely inclosed by the casing C¹ and by means of which the movement of
the feed-screw may be transmitted to said shaft 117, which has thereon a gear or
pinion, such as the bevel-pinion 118, meshing with a corresponding bevel-gear 119,
journaled on a stud 120, carried by the movable head of the index-head, the
longitudinal axis of this stud being coincident with the axis of movement of said
movable head.
The bevel-gear 119 has a rather long hub on which may be mounted a spur-
gear 121, this spur-gear being secured to said hub for movement in unison with
the gear 119, and the movement of this spur-gear is transmitted to another spur-
gear 122, integral with-a long divided hub or sleeve 123, controlled by the usual
clamping-screw 124.
The gear 122 is mounted for rotation on a-long sleeve or bushing. 125, in which
bushing the indexing-spindle of the index-head is intended to be supported for
rotation.
This index-spindle i is of several diameters, none of which, however, is greater
than the internal diameter of the journal-opening in the bushing, except the
stop-shoulder 126 for limiting the inward movement of said spindle. At its inner
end the spindle i has two reduced portions 127 and 128, the former of which forms
the journal-surface for a power-transmitting worm 129, while the latter is screw-
threaded at 128¹ to receive a stop-nut 130, for positioning said worm. At the
extreme end thereof the indexing-spindle is not supported but abuts against some
suitable member of the index-head, by means of which said spindle may be
positively located in position. Near the outer end thereof the spindle ¿ carries
a thimble 1301, in which the spindle is mounted and on which is supported the
usual indexing-disk. (Designated herein by d.) This indexing-disk has a
hub 131 of the same diameter as the external diameter of the outer end of the
divided sleeve 123; and the divided sleeve and the disk are intended to be con-
nected normally by means of the clamping member 124, so as to move in unison.
It will be obvious, now, that any movement communicated to the spur-gear 122
will, of course, be transmitted to the indexing-disk as long as those two members
are held together, but both of these parts, are so connected that they may rotate
freely on the indexing-spindle i without rotating the latter, unless some other
means is provided for connecting all of these parts. This connection may be
effected by a spring-pressed pin 132, carried by a crank 134, secured to the index-
ng-spindle, this stop-pin 132 being adapted to engage in openings 135 in the
ndexing-disk d". The crank 134 may be a slotted one, the side walls of which
engage the corresponding slabbed sides 136 of the outer end of said spindle, the
extreme outer end of the spindle being screw-threaded at.139 and having thereon
clamp-nut 138 for securing the crank 134 and its handle 1391 in position.
Obviously, now, if the pin 133 is entered into any one of the openings 135, both

page_text: the indexing-spindle and the spur-gear 123 will rotate in unison, and the rotation
of the worm 129 will be transmitted to the work-spindle controlled thereby.
The index-head embodies some suitable support, such as the substantially
U-shaped slide 140, having a pair of parallel uprights 141 and 142 with large
alined journal-openings therein. The uprights 141 and 142 are intended to receive
the outer two of three members, which constitute the principal parts of the movable
member, or head proper, of the index-head. These outer members are designated
by 143 and 144, respectively, and are in the nature of a pair of complementary
heads or caps, each having a body portion or one diameter forming a journal-
surface and a flange of larger diameter forming a stop-wall, while the third
member is an intermediate or block substantially of the kind illustrated at 145
in the drawings. The three members of the movable portion or head of the index-
head are intended to be connected so as to form substantially a unitary structure,
they being joined in this instance by bolts 140-146.
It will be obvious that the members of the movable head engage opposite sides
of the support or slide, and that any looseness of the parts may be taken up
readily, as by means of the adjusting-nuts 147. The two heads 143 and 144 enter
the journal-openings in the uprights 141 and 142 from the outer sides of said
uprights, while the block 145 is positioned by inserting it directly between the
uprights of the support, this block being of a width sufficient to completely fill
the space between the two uprights 141 and 142, but having reduced portions, as
shown at 150 and 151, to permit adjustment of the several parts of the movable
head relatively to each other. The block 145 also has a large opening transversely
of the feed-table, in which the driving-gears for operating the work-holder are
adapted to move, as will be evident by referring to Figs. 17 and 18.
This
The work-holder embodies as its main member a tubular spindle 155, which is
journaled in a tapered bore in the block 145, this bore intersecting the open-
ing 152, just mentioned. This spindle may be externally screw-threaded at its
forward end to receive a face-plate and at its rear end for the purpose of permitting
the spindle to be positioned longitudinally, as by means of a stop-nut 156.
spindle is also designed to receive within its tubular bore the arbor 157, on which
the work may be mounted, and a drawing-in spindle 158 having internal screw-
threads co-operating with the threaded inner end of the arbor 157 to wedge the
latter firmly in place.
At its rear end this drawing-in spindle may have a stop-flange 1581, against
which the rear end of the spindle 155 may abut at the inner side of said Hange,
while at its outer side this flange may engage one face of a bevel-gear wheel 159,
secured to the drawing-in spindle. This bevel-gear has a countersunk inner face,
in which countersink the flange 158¹ is seated. This gear-wheel is prevented from
moving longitudinally of the spindle in one direction by the connections just
described, and in the other direction its movement may be limited by a stop 160,
engaging an outer stop-wall 158" of the gear-wheel.
For the purpose of rotating the gear-wheel 159 to wedge the arbor 157 in place,
and to unscrew it and eject it from the spindle 155, I have illustrated herein
(see particularly Fig. 18) a rotary adjusting member carried by the movable
head of the index-head and connected with the gear-wheel 159 in such a manner
as to rotate the latter. This adjusting member comprises a short shaft 161, carry-
ing a hand-wheel 162 and journaled in a suitable opening in the cap 143 of the
movable head, this shaft 161 having at its inner end a bevel-pinion 163, adapted
to mesh with the teeth of the bevel-gear 159. The opening 16411 in the member 143
will preferably be of such length as to permit the bevel-pinion to be shifted into
and out of mesh with said gear 159 by the longitudinal movement of the shaft 161
The movement of the worm 129 on the indexing-spindle i may be transmitted
directly to the spindle 155, and in this case the latter has secured thereto a worm-
gear of large size; and for the purpose of preventing backlash this worm-gear
will preferably be made in two sections 164 and 1641, adjustable relatively to each

page_text: other, in a manner which will be obvious by referring to Figs. 17 and 18, suitable
pins 165 being passed therethrough to hold the parts together.
Suitable clamping devices will, of course, be employed for securing the several
main parts of the index-head in their adjusted positions. The index-head is
mounted in the usual manner on the feed-table, the latter having in the upper
side thereof a longitudinal T-slot 166, while the index-head has T-bolts 167
projecting into said slots. Moreover, the index-heads may have detachable keys or
blocks 168 secured thereto, as by means of screws 169, these blocks being of a
width sufficient to prevent lateral movement of the index-head: The index-head
will be clamped to the feed-table when adjusted, suitable clamping means, such
as those shown at 170 and 171, being employed for this purpose.
For holding the sleeve or bushing 125 in the cap or member 144 of the index-
head I may employ a clamping device such as that shown in detail in Fig. 19,
in which a clamping-screw 172, having a cam-face, operates upon a follower-bolt
or shoe 173, engaging the sleeve. The main driving-spindle 155 may be held in
place by means of a clamp-screw 174, operating upon a similar follower or shoe.
(Not shown.) For the purpose of clamping the movable portion of the head
to the support therefor it is only necessary to tighten the adjusting-nuts 147
to the proper extent, no additional clamping devices being necessary for holding
the block 145 and the caps 143 and 144 in their adjusted positions.
For the purpose of preventing turning of the indexing-head and the index-disk
relatively to the bushing in which said spindle is supported I may employ, in
connection with the stop-pin 132, a spring-pressed stop-pin 175, for holding the
index-head at a second point. The stop-pin 175 is mounted in a longitudinal bore
in the stud 120 and has its longitudinal axis coincident with the axis of movement
of the movable head of the index-head. This spring-pressed stop-pin should be
so constructed that it can be set back and held out of engagement with the index-
disk when it is desired to turn the latter by means of the power-operated feed
mechanism.
As it is frequently found desirable to disconnect the work-holder from the feed
mechanism, by means of which it rotated usually, the indexing-spindle is so
organized with respect to the other parts that when the clamp-screws 124 and 172
are loosened the indexing-spindle, the bushing therefor, and the other parts
carried thereby may be shifted longitudinally to withdraw the worm 129 from
engagement with the teeth of the worm-gear 164-1641; and in connection with
the work-holder I have provided indicating means for enabling the operator to
adjust such work-holder to any desired angular position without the employment
of the feed connections to the spindle 155. This indicating device embodies an
indexing-ring 176, having a circuit of openings 1761 therein, into any of which may
be projected a stop-pin 177, (see Figs. 15 and 16,) carried by the block 145 and
having an operating arm or handle 1771 by means of which the pin 177 may be
forced out of the ring 176. This stop-pin will normally be spring advanced, so as
to prevent the spindle 155 of the work-holder from rotating freely, and when
the pin is withdrawn from one of the openings in the ring 176 it may be locked
in place by pulling out the handle 1771 and hooking the latter over a stop
member 178 of the block 145. (See Fig. 15.)
The operation of an index-head constructed in accordance with this invention is
as follows: The index-head is first shifted to any desired position along the feed-
table T and then clamped in place by means of the clamping devices 170 and 171,
the shaft 113 sliding in the gear 111 and maintaining its driving connection
therewith. The nuts 147 are then loosened and the movable head swung to the
desired angular position, whereupon said nuts are tightened to hold said movable
head firmly locked to its support. The clamping member or screw 124 is then
turned to bind the divided sleeve 123 firmly against the hub 131 of the index-
disk . If it is desired to turn the spindle by power from the feed mechanism,
the. stop-pin 175 should be set back out of engagement with the disk d", the
clamping device 174 being, of course, loosened at this time to permit rotation of the

page_text: work-holder and the clamping device 172 tightened to hold the sleeve 125 in
place.
If it is desired to turn the work through successive arcs-controlled by the
setting of the pin 132 into the proper openings in the index-disk d-and to
prevent rotation of the work-holder while the feed-table is advancing under the
arbor containing the cutter, (not shown,) the clamping-screw 124 should be
loosened and the stop-pin 175 set in one of the openings in said disk, whereupon
the divided sleeve 123 will rotate loosely on the sleeve 125 and on the hub 131.
The setting of the work to successive positions will be effected, in the usual
manner, by withdrawing the pin 132 from one of the openings in the disk and
resetting it. When the index-head is set in this way, the spindle 155 may be
secured in place by a clamping device 174.
Having thus 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. The combination, with reversing-driving mechanism, of a reversing-arm
movable from an idle position to either one of two working positions, and auto-
matic positive locking means unreleasable by movement of the reversing-arm,
and operative for locking the reversing-arm in either one of its working positions.
2. The combination, with reversing-driving mechanism, of a reversing-arm
movable from an idle to a working position and having a stop-face, and
an automatic positive locking-arm unreleasable by movement of the reversing-arm,
and having a stop-face in position to engage the stop-face of the reversing-arm
and lock such reversing-arm when the latter is shifted from its idle to its working
position.
3. The combination, with reversing-driving mechanism, of a reversing-lever
movable from an idle to a working position, and a spring-pressed positive locking-
lever unreleasable by movement of the reversing-lever, and operative for auto-
matically locking the reversing-lever when the latter is shifted from its idle to
its working position.
4. The combination, with reversing-driving mechanism, of a reversing-arm
movable from an idle to a working position, and locking and actuating means for
automatically locking the reversing-arm in its working position, and for preventing
unlocking of the reversing-arm by direct manipulation of the latter, and for return-
ing the reversing-arm from its working to its idle position.
6. The combination, with reversing-driving mechanism, of a reversing-arm
movable from a central idle position to a working position at either side of such
idle position, and locking-and-actuating means for automatically locking the
reversing-arm in either of its working positions, and for preventing unlocking of
the reversing-arm by direct manipulation of the latter, and for returning the
reversing-arm from either of said working positions to its idle position.
6. The combination, with reversing-driving mechanism of a reversing-lever
movable from an idle to a working position, and an actuating-lever having a fixed
member for returning the reversing-lever to its idle position.
7. The combination, with reversing-driving mechanism, of a reversing-lever
movable from a central, idle position to a working position at either side of such
idle position, and an actuating-lever therefor for returning the reversing-lever
from either working position to its idle position, one of said levers having a pair
of independently-effective cam-faces, and the other a pair of faces co-operative,
respectively, with said respective cam-faces to shift the reversing-lever from a
working to an idle position.
8. The combination, with a travelling feed-table, of driving mechanism therefor;
a stop carried by said feed-table; a stopping-arm movable from an idle to a working
position; and an automatically-operated stop member carried independently of
said stopping-arm and controlled by the stop on the feed-table and operative for
returning the stopping-arm to its idle position.

page_text: 9. The combination, with a traveling feed-table, of driving mechanism there-
for; a stop carried by said feed-table; a stopping-lever movable from an idle to
a working position; and an automatically-operated stopping-lever-actuating stop
member movable relatively to the stopping-lever and shiftable, by the stop on the
feed-table, out of the path of movement of such stop.
10. In a milling-machine, the combination, with a knee and with a cross-feed
slide carried by said knee, of driving means; a horizontal shaft carried by said knee
and disposed longitudinally of said slide; a gear-wheel splined on said shaft and
movable with said slide; a swivel carried by said slide; a vertical shaft journaled
in said slide with its longitudinal axis coincident with the axis of rotation of the
swivel; a gear-wheel on the vertical shaft and in mesh with the gear on the
horizontal. shaft; a feed-screw on the swivel and having its axis of movement
intersecting the axis of rotation of the swivel; and reversing mechanism between
the vertical shaft and the feed-screw.
11. The combination, with a journaled support, of a rotary feed member
journaled in said support and held against longitudinal movement and having
stopping means; an indicating-dial mounted on said feed member and in engage-
ment with said stopping means; a washer keyed on said feed member; and a
screw-threaded collar on said feed member and adapted to bind the washer against
said indicating-dial.
12. The combination, with a rotary-driving member and with a rotary-driven
member mounted thereon, of a spline connecting said members for rotation in
unison; and a duplex-fastening device the main member of which is secured to,
and is adjustable in, one of said rotary members, and the other member of which
is carried by such main member and is adjustably secured to the spline.
13. In a milling machine, the combination, with a feed-table and with feeding
means for actuating the same, of an index-head adjustable longitudinally of said
feed-table and having a rotary work-holder, and driving means for maintaining
an operative connection between said rotary work-holder and the feeding means in
all adjusted positions of the work-holder.
14. In a milling-machine, the combination, with a feed-table and with feeding
means for actuating the same, of an index-head adjustable longitudinally of said
feed-table and having a rotary work-holder adjustable in a vertical plane, and
driving means for maintaining an operative connection between said rotary work-
holder and the feeding means in all adjusted positions of the work-holder.
15. In a milling-machine, the combination, with a feed-table and with feeding
means for actuating the same, of an index-head adjustable longitudinally of said
feed-table and having a rotary work-holder; and a driving-shaft slidable relatively
to the feeding means and operatively connected therewith and with the work-
holder.
16. In an index-head, the combination, with a support, of a head mounted to
turn thereon; a rotary work-holder carried by said head; an indexing-spindle;
and driving means for connecting said work-holder and indexing-spindle and
embodying a member shiftable for disconnecting said work-holder and the spindle.
17. In an index-head, the combination, with a support, of a head mounted to
turn thereon; a rotary work-holder carried by said head and having a driving-
gear; and an indexing-spindle having a gear co-operative with that of the work-
holder and shiftable to disconnect said gears.
18. In an index-head, the combination, with a support, of a head mounted to
turn thereon; a rotary work-holder carried by said head and having a worm-
gear; and an indexing-spindle having a worm adapted to co-operate with the
worm-gear and of a diameter not greater than that of the spindle, said spindle
being shiftable longitudinally in its bearings to disconnect said worm and worm-
gear.
19. In a milling-machine, the combination, with a feed-table and with feeding
means for actuating the same, of an index-head carried by said feed-table and
having a support; a head mounted to turn on said support; a rotary work-holder;

page_text: an indexing-spindle having a different axis of movement from that of said head;
and driving connections joining the feeding means, the indexing-spindle, and
the work-holder.
20. In an index-head, the combination, with a plurality of supports having
alined bearings therein, of a head carried by said supports and mounted to turn
about an axis passing substantially through its center, and comprising a central
member in engagement with the inner sides of said supports, and two outer
members in engagement with the outer sides of said supports and adjustably
connected with said inner member.
21. In a milling machine, the combination, with a rotatable swivel,. of a feed-
screw mounted on the swivel and having, its axis of movement intersecting the axis
of rotation of the swivel; a feed-table mounted to travel on said swivel; and a
detachable bearing supported on- the feed-table at one end of the latter and
having a journal-opening for one end of the feed-screw..
Dated this 25th day of October 1898
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicants..