Improvements in Upright Drilling and like Apparatus.
Year: 1898

page_text: Date of Application, 16th Mar., 1898
Complete Specification Left, 16th Dec., 1898-Accepted, 16th Mar., 1899
Improvements in Upright Drilling and like Apparatus.
A communication from abroad by HENRY HAVELOCK CUMMINGS, Machinist, and
ALBERT DODGE CROMBIE, Machinist, both of 15, Webster Street, Malden, in the
County of Middlesex and State of Massachusetts, United States of America.
I, Alfred GeoRGE BROOKES, of 55 & 56, Chancery Lano, in the County of
Middlesex, Chartered Patent Agent, do hereby declare the nature of this invention
to be as follows:-
This invention relates to upright drills and the like, having for its object the
production of various novel features of construction in such apparatus whereby the
operation thereof is improved and made more readily controllable by the operator.
In connection with the rotatable tool holding spindle, convenient speed changing
mechanism is provided, and in counection with such speed changing mechanism a
suitable movable tool rack is employed, the rack being so arranged that by proper
movement thereof the speed of the tool spindle will be automatically regulated in
accordance with the diameter of the drill or other tool to be used.
The working parts of the apparatus are supported on an upright column or
standard on which a vertically movable traveller is mounted, while the platen or
work support is mounted on a platen carrier which embraces the column
or standard.
A threaded shaft sustained by the column engages a part of the platen carrier,
so that the latter can be raised or lowered by suitable rotation of the shaft, such
rotation being controlled by suitable mechanism mounted on the head or upper end
of the column.
A clamp is also provided to hold the platen carrier firmly in place when in use,
the operation of clamping acting to disengage the shaft from its operating
mechanism.
The drill or tool spindle depends from the overhanging head of the column and
has a longitudinal feeding movement, and rotary motion is imparted to the drill or
tool spindle by suitable mechanism, the lower end of the tool spindle being
supported in a suitable manner in the traveller carried by the column.
The mechanism for rotating the tool spindle forms part of speed controlling
means whereby the speed can be varied in accordance with the wishes of the
operator, and the feed of the tool is at all times under the control of the operator,
and the speed of feed can be controlled with great delicacy.
The main driving shaft of the apparatus is mounted at the upper end of the
column and is driven by a suitable beit, clutch mechanism being provided, and
intervening connections so that the rotation of the main shaft may be made to
rotate the vertical threaded shaft to raise or lower the platen carrier; so, too, there
are connections provided between the main shaft and the tool spindle mechanism
whereby the tool spindle may be rotated slowly and with great power or at a high
speed but with less power.

page_text: A tool carrier, adapted to receive the shanks of the drills or other tools of various
sizes adapted to be used on the machine, is mounted on a bracket on the side of the
standard, the tool carrier having a rotative movement, and it is so arranged and
constructed that the rotation of the carrier will vary the speed of the main speed
controlling mechanism for the apparatus. That is to say as the speed of rotation
for drills or similar tools is greater for those of small diameter than for those of
larger diameter, the connections between the tool carrier and speed changing
mechanism are utilized to automatically set the speed of the machine to the diameter
of the drill to be used, the tool carrier being turned or moved until the tool carried
thereby and which is next to be used is brought opposite an index or fixed point.
Reversing mechanism is provided whereby when the tool spindle has rotated a
certain distance in one direction, the direction of rotation will be automatically
reversed, such rotation of the tool spindle first in one direction and then in the
other being convenient for many purposes.
By this arrangement I am enabled to attain an improved drill or the like
mechanism wherein means, including speed changing mechanisin, are provided to
rotate a tool spindle at different speeds, together with a controlling device for such
mechanism thereby affording facility for automatically setting the speed of the said
spindle according to the diameter of the tool to be used.
I also arrange in such a drill or like mechanism, a tool spindle and the mechanism
adapted to rotate it either at a high speed with comparatively low power, or at a
low speed with a greatly increased power, and by the means provided I can control
this operation and by the speed changing mechanism for that purpose provided
varying the speed of the main shaft through which the rotation of the tool spindle
is effected.
The main column or standard of the improved upright drill or like mechanism,
has the platen carrier vertically movable thereon and a threaded operating shaft is
adapted to be engaged with and to raise and lower the carrier as desired; a clamp
also is provided to act on the carrier and also means to effect the disengagement of
the carrier raising and lowering device when the carrier is clamped.
The aforesaid tool spindle besides being provided with means for effecting its
rotation is by reversing mechanism connected therewith capable of being controlled
to automatically rotate the tool spindle first in one direction and then in the other
direction.
Dated the 16th Jar of M 1000
COMPLETE SPECIFICATION.
Improvements in Upright Drilling and like Apparatus.
A communication from abroad by HENRY HAVELOCK CUMMINGS, Machinist, and
ALBERT DODGE CROMBIE, Machinist, both of 15, Webster Street, Malden, in the
County of Middlesex and State of Massachusetts, United States of America.
I, ALFRED GEORGE BROOKES, of 55 & 56, Chancery Lane, in the County of Middle-
sex, Chartered Patent Agent, 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 more particularly to upright drills, and has for its object
the production of various novel features of construction in such apparatus, whereby

page_text: the operation thereof is improved and made more readily controllable by the
operator.
My correspondents have provided convenient speed changing mechanism in con-
nection with the rotatable tool holding spindle, and in connection with such
mechanism they employ a suitable movable tool rack so arranged that by proper
movement thereof, the speed of the tool spindle will be automatically regulated in
accordance with the diameter of the drill or other tool to be used.
Various other features of this invention will be hereinafter fully described in the
specification and particularly pointed out in the claims.
Fig. 1, in side elevation, represents an upright drill embodying the present inven-
tion, the standard being partially broken out;
Fig. 2, is a vertical sectional view of a portion of the platen carrier, on the
line, Fig. 1, looking to the left;
Fig. 2 is a horizontal sectional view thereof on the line thereof, Fig. 2;
Fig. 3 is an enlarged top or plan view of the head of the apparatus shown in
Fig. 1, and partially broken out;
Fig. 4 is a vertical sectional view of the head, taken on the irregular line all—r",
Fig. 3;
Fig. 5 is a detail, in side elevation and partly broken out, of the means for con-
trolling the power transmitting mechanism of the tool spindle.
Fig. 6 is a vertical transverse section of the head, on the line 2³—x³, Fig. 4,
looking towards the right;
Fig. 7 is an enlarged side elevation, partly broken out, of the traveller and the
feed mechanism carried thereby ;
Fig. 7 is a detail view of the controlling device for the tool feed mechanism;
Fig. 8 is a horizontal sectional view of the mechanism shown in Fig. 7, on the
line y-y, some of the gears being in elevation; and
Fig. 9 is a partial front view of the mechanism shown in Fig. 5.
The working parts of the apparatus are supported on an upright, cylindrical and
preferably hollow column or standard A, having a laterally extended base A*, the
standard having on its exterior a vertical guide A¹ for the traveller, to be described,
and a longitudinal recess A2 in a standard roceives a threaded shaft or rod a.
As shown in Fig. 4, the upper end of head A³ of the standard has a bearing (*
for the hub a, of the bevel gear, secured to the rod a and shouldered at ³, the
gear and rod being rotatably supported in the bearing by the shoulder.
A hand lever at, pivotted on the head at a, is bifurcated at its inner end to
embrace loosely the rod or shaft a beneath the hub a', to raise or lower said shaft
slightly, for a purpose to be described.
The platen or work support B of usual construction, is mounted on a platen
carrier B*, the latter being provided with a split hub B¹ to embrace the standard A,
the parts of the carrier separated by the slit 2, Fig. 2ª, being connected by suitable
clamp bolts b, the eyes b¹ of which are engaged by eccentric portions 62 of a stud
mounted in ears 3 of the carrier, and actuated by a lever arm b³.
The interior of the hub B¹ is annularly recessed, as at bs, Figs. 2 and 2ª, to receive
therein and forin a guide for the ends of a block b, having a threaded ear 65, into
which the threaded shaft a enters.
By rotation of the latter, the platen carrier B* is raised or lowered, the carrier at
such time being unclamped, rotation being transmitted to the shaft a through the
gear 4*.
It will be seen in Fig. 1 that normally the shaft a is out of gear with its operating
mechanism, and so long as the platen carrier B is clamped, the shaft cannot be
moved longitudinally by the lever to bring it into mesh to be rotated, thus
effectually preventing accidents, due to oversight or carelessness.
The head As of the standard is bent over to provide an overhanging arm A,
Figs. 1, 3, and 4, having a vertical bearing a, preferably bushed, as at a7, Fig. 4, to
receive the sleeve like hub cx of a large bevel gear c, a collar as fast on the upper

page_text: end of the hub resting on the overturned end of the bushing, and retaining the gear
in place.
Within the bevel gear c is a smaller bevel gear c', see Fig. 4, secured thereto as
by screws 6, the faces of both goars being upturned, the gear c being formed on an
annular flange c³, provided on its exterior with preferably undercut grooves 7, 7, for
a purpose to be referred to.
The drill or tool spindle D is extended through the hub cx and is longitudinally
grooved at 8 to receive a suitable spline on the limb, as is common in drills, whereby
the spindle is rotated with the gears c and c¹, and also longitudinally movable
relatively thereto to feed the tool to the work.
A sleeve d is secured to the lower end of the spindle, having a longitudinal rack
bar d¹ on its inner side, to mesh with the teeth of the hub d², forming part of an
internal gear d³, and external worm gear d*, said hub being rotably mounted on
the horizontal shaft , see Fig 8, of a hand wheel D*.
This shaft has a bearing at one end in the side of the casting E, forming the
traveller, the other side of the traveller having a boss de to provide a bearing for
the hub d, a vertical bearing d' embracing the spindle sleeve and being cut away
at d³ to receive the rack bar d¹.
When the worm gear dis rotated by a worm d on an upright shaft d10, the
spindle D is moved longitudinally, to feed the tool T, Fig. 1, held in a suitable
chuck D¹ on the lower end of the spindle.
It is sometimes desirable to control the feed of the tool by hand, and for this
purpose I have secured to the rear end of the shaft d³ a pinion 2 in mesh with the
gear on one end of a short shaft d, the other end of the short shaft having a
pinion d fast thereon.
This short shaft, as shown in Fig. 8, is extended through a sleeve like
bearing fast on a controller plate d, the sleeve being extended through one side
of the traveller E and forming the fulcrum for the controller plate, a bearing d¹8
formed on the inner face of the other side of the traveller, receiving in it the free
end of the shaft d¹.
An intermedinte gear dis pivotted on the controller plate, and in mesh with
the pinion 15.
When the controller plate is swung into its opposite extreme position from that
shown in Fig. 7, the intermediate gear de is brought into mesh with the internal
circular gear d³, and by rotating the hand wheel Dx (with the worm (° disengaged)
a slow powerful feed will be effected through the pinion 1, gear d¹³, pinion 15 and
intermediate 19 to the hub gear d² and thence to the feed rack b¹.
If it is desired to run the tool spindle up or down rapidly, the controller plate d
is moved into mid position, as shown in Fig. 1, which disengages the worm
wheel and worm, while it does not throw the intermediate 19 into engagement
with the gear d³.
At the same time, a pin d on the hand wheel D is pushed into one of several
holes d¹, see dotted lines Fig. 7, in the combined worm wheel and internal gear,
so that the latter will be rotated with the hand wheel, thus transmitting movement
through the hub gear 2 directly to the rack d³.
The lower end of the shaft 10 is preferably made spherical, as at 20, Fig. 7, to
fit into a correspondingly shaped recess, in a bearing plate 21, fulcrumed at 22, on
the traveller E, said bearing plate having fast thereon an arm 23, the end of which
fits loosely into a notch 24 in the controller plate ", thus making therewith a
species of toggle joint.
The controller plate is provided at its outer end with a handled, the inner
extended end of which forms a latch d2s to enter one or more recesses, as d, in a
locking plate 25, on the side of the traveller, the latch being normally pressed
towards the locking plate by a suitable spring a.
When the controller plate is to be moved by hand, the operator grasps the
handle and turns it to withdraw the latch against the pressure of the spring,
thereby permitting the controller plate to be moved up or down on its fulcrum d

page_text: in the controner plate be moved downwarily, the toggle joint
described will act to swing the bearing plate 21 to the right to thus move the
worm do from engagement with the worm gear d'.
The inner face of the latch 2 may be bevelled in order to be engaged by a trip,
shown as a finger 25, Fig. 1, carried by the sleeve d, and when the spindle is fed
down to the proper point, the finger 25 will pass beneath the latch and lift it from
the holding notch, the weight of the controller plate moving it into position to
disengage the worm and worm gear.
Referring to Fig. 4, the worm shaft do is extended up through a support 27
secured to or forming part of an upturned hub like bearing 2, socketted at its
upper end at 25 to receive the ball like head (of a sleeve and loosely sur-
rounding the shaft do, the lower bevelled end of the sleeve resting upon a cam
collar provided with a suitable handle d, the cam collar being sustained by the
support 27.
This ball and socket bearing at the upper end of the worm shaft to permits the
slight lateral movement thereof necessary to disengage the worm and worm wheel,
without interfering with the rotative or longitudinal movement of the shaft, the
latter being necessary when the traveller is moved up or down on the standard A,
a counterbalancing weight w being attached by a flexible connection 4, see dotted
lines Fig. 1, to the traveller, the connection or connections passing over one or
more guide sheaves 5.
A collar as on the sleeve hub cx is shaped to form a pulley a¹², connected by a
suitable belt as with the driving member a¼ of a speed controlling mechanism,
the driven member 15 of which is represented as a heavy casting splined to the
shaft do and located above the spherical head (120.
The driving and driven members are provided on their inner faces each with an
annular concavity, as clearly shown in Fig. 4, and one or more friction wheels a
are interposed between said members and within their grooves mounted to rotate
in the forked ends of suitable shafts a", having their bearings in a casting a18
rigidly secured to the bearing d.
The two shafts are connected by intermeshing segment gears a acted upon by
a spring controlled friction pad a20, while one of the shafts a" is provided with a
hand lever a².
The speed changing mechanism shown is substantially such as forms the subject
matter of the Specification of Letters Patent No. 22940, granted to Alfred George
Brookes and dated November 27, 1894, and to which reference may be had,
rotation of the shafts a moving the peripheries of the friction wheels a¹6 towards
or from the centre of rotation of the shaft do, thus varying the speed imparted by
the driving member a¹ to the driven member a¹.
The weight of this latter member provides sufficient pressure to normally main-
tain the device operative, and when it is desired to throw the speed controlling
mechanism out of operation, the cam ring 128 is moved to lift the sleeve 27 and
thereby the driven member a, raising the latter from contact with the friction
wheels a¹6.
By the mechanism herein shown, the feed of the tool is absolutely under the
control of the operator and by the movement of the lever a", the speed of the feed
can be controlled with great delicacy.
The traveller E is split at 30, as shown in Fig. 8, and provided with clamping
ears 31, to embrace the guide A¹, a clamping device E* of usual construction in
such apparatus being provided to clamp the traveller in adjusted position.
The head of the standard at its rear end is provided with an overhanging arm A
to which is secured, as by screws 34, the upper end of a substantially 1-shaped
casting G, the lower laterally extended ends of the latter having upright hubs or
bearing bosses g, most clearly shown in Fig. 6, to receive the lower ends of upright
rotatable standards g¹ bifurcated at their upper ends to receive and support rotatable
friction wheels g*.
The said standards are provided with gears g² in mesh with the toothed outer

page_text: edges g³ of segment gears 9', see dotted lines Fig. 3, the latter meshing with each
other and being fulcrumed at g5, on the lower end of the casting G, so that rotative
movement of either standard g¹ will impart a like rotative movement, but in the
opposite direction, to the other standard.
The casting G is longitudinally bored at G, Fig. 4, to receive therethrough
a sleeve secured in the casting by a clamp screw 40, Fig. 4, and forming
a bearing for the rear end of the main shaft H, said shaft having another bearing
at in the part of the head A³, as shown in said Fig. 4.
The main shaft has secured thereto the hub m³ of a friction pulley M, the said
pulley having in its face concaved annular grooves adapted to be entered by the
shiftable friction discs or wheels * described, the latter having preferably non-
metallic peripheries.
The sleeve receives upon it the hub n of a second friction member N
provided with an annular flange N* to form a belt pulley, and adapted to
be driven by a belt from any suitable source of power and to be continuously rotated,
the said member N having in its inner face an annular concavity to be entered by
the discs or wheels g*.
The outer end of the pulley N has a bevelled anunlar face n¹ adapted to
cooperate at times with a similarly bevelled face of a clutch member N₁ rigidly
secured to the main shaft by set screws 43, so that the clutch member N¹ and
the friction member M will move simultaneously when the shaft H is moved
longitudinally.
Referring to Fig. 4, it will be noted that the sleeve h is laterally flanged at h² at
its outer end and between the flange and the end of the hub n may be interposed
washers w, preventing movoment of the friction member N longitudinally of the
shaft to the right, viewing said fig.
'The main shaft has thereon a bevelled gear h³, the hub of which is annularly
grooved at ht to be partially embraced by the bearing which is substantially
semi-circular in form, a key 45 on the shaft entering a suitable longitudinal slot in
the hub of the gear, whereby the latter will be rotated with the shaft, but permitting
the latter to be moved longitudinally therein.
The bevelled gear h³ is adjacent the like gear a² on the upper end of the
shaft a, and when the latter is raised, by means of the hand lever a', the
gears annd ³ are brought into mesh, so that rotation of the main shaft will act
through the vertical shaft a to raise or lower the platen carrier B*.
A bevel gear he is provided with a sleeve-like hub h' through which the front end
of the main shaft is extended, said hub being connected to the shaft to rotate
therewith by a suitable key. A split collar " surrounds the hub loosely and is
retained thereon by the upturned part of the flanged end of the hub hº, said collar
being supported in a bearing on the head, see Fig. 4.
By moving the gear he longitudinally on the main shaft it is thrown into or out
of mesh with the gear c', which is fast on the hub c, and a second bevel gear his
also mounted on the main shaft keyed thereto and longitudinally movable thereon,
the hub of the gear having an annular groove h¹
Referring to Figs. 1, 4 and 5, a stud k projects from the side of the overhanging
arın A, and has mounted thereon the hub k of a hand lever k¹, said hub next the
side of the arm having secured to it a plate k² provided with a cam slot k³ to receive
a roller or other stud + on the collar h³, the side of the arm A' being slotted at 100
to permit movement of the stud k, as best shown in Fig. 5.
A yoke enters the groove h¹ of the hub or gear 10 and has pivotted thereto n
link pivottally connected at its outer end to a wrist pin k on the outside of the
plute k², the pivot of the link passing through a slot 200 in the head, see Fig. 5,
dotted lines.
If the handle k¹ is swung up to turn the hub and plate in the direction of the
arrow 48, Fig. 5, the cam slot will act on the stud to draw the gear to the
right, viewing Fig. 1, and through the wrist pin and link will draw
the on 110 to the inft

page_text: The effect of this is to disengage gears and c¹ and bring the gears h¹º and c
into engagement, and it will be obvious from the size of the gears c and c¹ that the
former will rotate the tool spindle D slowly and with more power, while the gear c¹
will rotate it at a higher speed, but not so powerfully.
This provision for change of power on the tool spindle is very convenient and
increases the range of the machine in a very slight and effective manner.
An annularly grooved collar o fast on the main shaft H is embraced by the forked
end of an arm o¹, pivotted at o² on the inner end of a spring controlled plunger
mounted in a bearing 80 on the upturned portion As of the head, said arm of carrying
near its lower end two parallel links of pivotted on the arm at o³ and provided
preferably with anti friction rolls 44.
A stad rigidly secured in the part A of the head is extended through
longitudinal slots o' in the links and provides a fulcrum for a cam o' interposed
between the two rolls 44, and connected above its fulcrum by a rod oº to a rocker
arın o keyed on a shipper shaft o12 mounted in the bearing ois on the overhanging
arm A, and is provided with a shipper lever o¼, the shaft o¹ sliding vertically
through the rocker arm.
It will be seen from the foregoing description that movement of the shipper
lever o to rock the shipper shaft will act to swing the cam o' in one direction or
the other on its fulcrum to act upon one of the rolls 44, and thereby swing the
forked arm o' to the right or left, Fig. 4, to move the main shaft longitudinally, the
springs on the plunger taking up shock and preventing binding of parts; it
being remembered that the pulley Nx and friction member N are continuously
rotated, if the main shaft is moved to the left Fig. 4, the friction member N¹ will be
brought into engagement with the cooperating face n¹ of the pulley N, so that the
shaft will be rotated in the same direction as and with the speed of the pulley N*,
the longitudinal movement of the shaft referred to moving the friction member M
to the left and removing the pressure from the intervening friction discs or wheels g*.
On the other hand, if the shaft is moved into the position shown in Fig. 4, then
the rotary movement of the friction member N will be transmitted to the shaft
through the friction member M by the friction discs gx, and the member M and
shaft will be rotated in a direction opposite to the rotation of the member M and
at a speed relative to the latter, depending upon the angularity of the friction
discs g.
This speed changing and controlling mechanism is substantially the same as that
forming the subject matter of the Specification of Letters Patent No. 22940, dated
November 27, 1894, granted to Alfred George Brookes, to which reference may
be had.
An arm A10 on the side of the standard supports, as herein shown, a circular
plate R provided near its periphery with a series of holes R*, see Fig. 3, of suitable
size to receive the shanks of the drills, or other tools of various sizes, adapted to be
used on the machine, and on its underside the plate R has a cam rib R¹ which is
engaged by a fork R at the end of a lever R³ fulcrumed at R on an arm g20
extended-from one of the bearings g, the inner end of the said arm R³ having
thereon a segment gear R in engagement with the adjacent gear g² on the
standard g¹.
By rotation of the tool support or carrier R, the cam will act through the
intervening mechanism to turn the friction discs or wheels g* and vary their
angularity relative to the cooperating members M, N, and thus vary the speed of
the former.
Inasmuch as the speed for drills or similar tools is greater for those of small
diameter than for those of larger diameter, my correspondents utilize the connections
between the carrier R and the speed changing mechanism just described to
automatically set the speed of the machine to the diameter of the drill to be used.
An index P may be secured to the arm A10 and upturned adjacent the
periphery of the tool support R, the shape of the cam R¹ being such that if
the support or carrier R is turned until the drill of the proper size is opposite the

page_text: index, such movement will set the speed controlling mechanism to give the proper
speed to the spindle for the tool of that size.
The shipper shaft 012, see Fig. 9, is longitudinally grooved at o20 to be entered by
a key on a hub t, provided with a suitable hand knob tx and oppositely extended
arms t¹, 2, in different horizontal planes, the hub t having a spring catch to engage
one or the other of two notches in the bearing ots of the shipper shaft, the
latter having another bearing o18 on the traveller E.
Stops 10, 20, are adapted to be secured in the undercut grooves 7 of the flange c³
on gear c to co-operate respectively with the arms t¹ and t².
When the spindle has rotated sufficiently to bring the stop 10 into engagement
with arm t, the shipper shaft will be turned to reverse the direction of rotation of
the main shaft, and the tool spindle D will be rotated in the opposite direction until
the other stop to engages the arm t, rocking the shipper shaft in the opposite
direction and causing the direction of rotation of the spindle D to be again reversed.
This rotation of the tool spindle first in one direction and then in the other, is
convenient for many purposes, and so far as my correspondents are aware such
arrangement is novel.
When it is not desired to utilize the automatic reversing device, the catch t³ is
released and the hub t moved down into the position shown in Fig. 9, so that the
arm, t, will not be in the path of movement of the stops.
This invention is not restricted to the precise construction of parts as herein
shown, as the same may be varied or rearranged without departing from the spirit
and scope of the invention, and so far as my correspondents are aware, it is broadly
new to automatically vary the rate of speed of rotation of a tool spindle in accord-
ance with the diameter of the tool to be used by or through the movement of the
tool carrier or support.
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 an apparatus of the class described, a tool spindle, means, including a speed
changing mechanism, to rotate it at different speeds, and a controlling device for
said mechanism, to automatically set the speed of the spindle according to the
diameter of the tool to be used, substantially as described.
2. In an apparatus of the class described, a tool spindle, means to rotate it,
including speed changing mechanism, and controlling means therefor including a
movable tool carrier and a fixed index, whereby when the carrier is moved to bring
the tool to be used opposite the index the speed changing mechanism will thereby
be automatically set to effect rotation of the spindle at the proper speed for said
tool, substantially as described.
3. In an apparatus of the class described, a tool spindle, means to rotate it,
including speed changing mechanism, and a movable tool carrier connected with
and to control said mechanism, whereby movement of the carrier will effect a pro-
portional movement of the said mechanism to rotate the spindle at the speed required
for the diameter of the tool to be used, substantially as described.
4. In an apparatus of the class described, a tool spindle, a largo and a small gear
connected therewith, a main shaft provided with two gears adapted to be brought
into engagement with the spindle gears one at a time, manually operated means to
effect such engagement, and speed changing mechanism for said shaft, including a
driven pulley loose rolatively to the shaft, a pulley to be driven, connected to rotate
with the shaft, said pulleys being annularly concaved on their inner faces, and
a controlling friction disc interposed between the said pulleys, substantially as
described.
5. In an apparatus of the class described, a rotable tool spindle, two concentric
rigidly connected gears having a single, extended hub on which they are fixed, said
hub being connected with and to permit longitudinal movement of the spindle, a
fixed bearing for the gear hub, and means to regulate the longitudinal movement

page_text: of the spindle, combined with a main driving shaft, two gears rotatable thorewith
and longitudinally movable thereon, and means to move said gears longitudinally,
to bring one into engagement with one of the spindle gears, and disengage the other
gears, and vice versa, substantially as described.
6. In an apparatus of the class described, a rotatable tool spindle, a large and a
small gear rigidly connected together and connected to said spindle to rotate it and
also to permit longitudinal movement of the spindle, and a fixed bearing for said
connected gears, combined with a main driving shaft, two independent gears mounted
upon and to rotate with said shaft and separately movable longitudinally upon it,
to separately engage the small and large spindle gears respectively, and means to
disengage one driving gear from its spindle gear and to cause engagement of the
other two gears, substantially as described.
7. In an apparatus of the class described, the main driving shaft, two gears the
hubs of which are connected to rotato with said shaft and be movable longitudinally
thereon, a cam plate mounted in a fixed bearing, a stud on one of said gear hubs in
engagement with the cam, a link attached to the other hub and pivotteil eccentric-
ally on the cam, and means to rotate the latter, whereby the gears will be moved
towards or from cach other on the main shaft, substantially as described.
8. In an apparatus of the class described, a main standard, a platen carrier
vertically movable thereon, means to clamp the carrier on the standard, and a
rotatable actuating gear supported by the standard, combined with a threaded
operating shaft in engagement with the carrier, a gear on said shaft, and means to
move said shaft longitudinally with the carrier when unclamped, to engage or
disengage the said gears, substantially as described.
9. In an apparatus of the class described, a main standard, a platen carrier
vertically moveable thereon, means to clamp the carrier on the standard, and a
rotable actuating gear supported by the standard, combined with a rotable shaft
threaded to engage said carrier, a vertical movable bearing for said shaft, operable
manually when the carrier is unclamped, and a gear on the shaft, to be brought into
mesh with the actuating gear when the platen carrier is to be raised or lowered by
power, substantially as described.
10. In an apparatus of the class described, a standard, a tool spindle, a main shaft,
means to vary the speed thereof, connections between said shaft and spindle, to
rotate the latter, and a platen carrier actuating gear on the main shaft, combined
with a platen carrier, a lifting shaft threaded thereto and provided with a gear, and
means to move said lifting shaft to engage or disengage its gear and the actuating
gear, substantially as described.
11. In an apparatus of the class described, a vertical longitudinally movable tool
spindle, a fixed bearing, a hub rotatable therein and splined to the spindle, a large
and a small bevel gear fast on said hub, the former being on an annular flange
provided with external grooves, and adjustable stops to be held therein, combined
with a main shaft, gears thereon to engage, one at a time, the small and largo
spindle gears respectively, reversing mechanism for the main shaft, and controlling
means therefor operated by said stops, substantially as described.
12. In an apparatus of the class described, a rotatable tool spindle, a gear
rotatable therewith and relatively to which the spindle is longitudinally movable,
and adjustable stops movable with the gear, combined with a main driving shaft
having a gear to mesh with the spindle gear, and reversing mechanism controlled
by said stops, to rotate the tool spindle first in one and then in the other direction,
substantially as described.
13. In an apparatus of the class described, a rotatable tool spindle, a traveller,
mechanism carried thereby to effect feed of the spindle rapidly or slowly by hand,
or mechanically, a driving shaft to actuate said mechanism for mechanical feed of the
spindle, and a single controlling device to effect either fast or slow food by hand, or
to cause engagement and disongagement of said driving shaft and mechanism,
substantially as described.
14. In an apparatus of the class described, a main driving shaft, speed changing

page_text: mechanism therefor, including a driving pulley and a pulley to be driven, the latter
fast on the shaft, said pulleys being annularly concaved on their faces, an interposed
friction disc, and a support therefor, combined with a movable tool carrier, and
connections between it and the disc support, whereby movement of the tool carrier
will proportionally vary the angularity of the friction disc relatively to the pulleys, to
change the speed of the main shaft, substantially as described.
15. In an apparatus of the class described, a rotatable tool spindle having a
feed rack thereon, a traveller, gearing carried thereby to engage said rack and feed
the spindle longitudinally, a manually operated actuator for said gearing,
independent means, including speed changing mechanism, to actuate said gearing,
and a single controlling device to provide for manual or mechanical operation
of the gearing, and to govern the speed of the former, substantially as
described.
16. In an apparatus of the class described, a longitudinally movable tool spindle,
means to rotate it, reversing mechanism for said means, and controlling means for
the reversing mechanism, rotatable and concentric with the spindle, whereby the
latter will be automatically and partially rotated first in one and then in the other
direction, substantially as described.
17. A member adapted to be rotated, mechanism to rotate it in opposite
directions, and controlling means for said mechanism, governed directly by and
concentric with the rotatable member, whereby the latter will be automatically
and partially rotated first in one and then in the other direction, substantially as
described.