Improvements in Drilling and Tapping Machines.
Year: 1896

page_text: Date of Application, 10th Dec., 1896
Complete Specification Left, 30th Aug., 1897-Accepted, 10th Dec., 1897
PROVISIONAL SPECIFICATION.
Improvements in Drilling and Tapping Machines.
I, FRANKLIN ALFRED ERRINGTON, of the Village of Edgewater (Stapleton Post
Office), County of Richmond, State of New York, United States of America,
Mechanical Engineer, do hereby declare the nature of this invention to be as
follows:
The primary object of my invention is to perform a series of operations at or
in the same point, place or bore: and it relates more particularly to means for
drilling a hole and for then tapping or threading said hole without the necessity
of moving or recentering the work.
The invention consists in a swivel-head carrying a spindle that has each of its
ends provided with means for connection with a tool or tool-holder, said swivel-
head being also provided with means to rotate said spindle either to the right
or to the left, so that either end of said spindle can be utilized successively for
drilling and then the other end for tapping, or for any series of operations, such
as drilling a hole and then counterboring it, etc. I also provide an automatio
locking mechanism by which the swivelling of the head is arrested at certain
intervals in its rotation to bring a drill and then tap, or any similar complement
of tools, to act successively at the same point upon a piece of work. In order
to allow the spindle to be rotated at a proper speed for drilling and also to rotate.
it at a relatively slower speed when tapping, I provide suitable gearing and
novel devices for connecting the spindle with said gearing, and suitable means
for driving said gearing, whereby when the spindle is in operative position for
drilling one portion of the gearing will be utilized to drive the spindle at the
proper drilling speed, and when the spindle is in position for tapping another
portion of said gearing will be brought into operation to drive the spindle at the
relatively slower tapping speed.
I further provide improved tool-holders that are particularly adapted for use
in connection with my drilling and tapping machine above outlined, whereby
cutting tools can be readily connected and disconnected with and from said
spindle without stopping its rotation, and the respective distance of the outer
ends of the drill and tap from the axis of the swivel-head can be regulated to
cause the tap to stop cutting when it has about reached the bottom of the hole
previously cut by the drill.
My invention further embraces improved means for permitting the drill or tap
to cease rotating upon meeting with such undue resistence in their work as might
endanger the breakage of said tools, without stopping the rotation of the driving
mechanism.
The invention further consists in the novel details of improvement herein more
fully set-forth.
In carrying out my invention I provide a case or head that is connected to a
supporting part or frame by a swivel-joint, said swivel-heal carrying my im-
proved mechanism for enabling a drill and tap or other complement of tools, to

page_text: be operated successively upon the same point, or at any point within the reach
of either one of said tools. Said swivel-head and its supporting frame are pre-
ferably provided with an automatic locking mechanism, to hold them from
independent movement in certain positions, to enable one tool to be brought
accurately in line with the point upon which the other tool has been operating.
A bevel driving-pinion is journalled in said swivel-head, its axis coinciding
with the axis of said swivel-head. Said pinion is preferably provided with two
sets of gear-teeth or driving faces, the pitch cone of one of said sets of gear-teeth
lying within that of the other; or said pinion can be divided into two concen-
tric pinions is preferred. Two sides of said swivel-head project beyond said
driving-pinion, and each side is provided with a bore, said bores being in line
with each other.
Two gear-wheels of different diameters mesh respectively with the inner and
the outer sets of gear-teeth of said driving pinion, and each of said gear-wheels
is provided with an axial bore that registers with the above mentioned bores
in the sides of the swivel-head. By this construction one of the gear-wheels is
turned at a slower speed and is capable of exerting greater force than the other.
The outer face of one of said gear-wheels bears against the inner face of one of
the sides of the swivel-head, and the inner face of said gear-wheel is provided
with a concentric recess or clutch-chamber, and an eccentrically located bore or
bearing that is adapted to receive a clutch-pin. Said clutch-pin-bearing opens
partly upon the face or bottom of said clutch-chamber and indents the side wall
thereof. A clutch-pin is located in said bearing and projects longitudinally from
the face of said clutch-chamber, part of the periphery of said clutch-pin being.
embedded in the supporting indenture thus provided in the side wall of said
clutch-chamber, and part thereof projecting laterally into said clutch-chamber.
Said clutch-pins are preferably used in duplicate, and are located on opposite sides
of said clutch-chamber, to act as clutches for said wheel. A transverse inlet is
also provided through the side walls of said clutch-chamber. The axial bore of
the other wheel is of sufficient diameter to receive the screw-threaded hub of a
friction disk that is also pierced by an axial bore. The inner face of said friction
disk provided with a concentric recess or clutch-chamber, and a pair of eccen-
trically located bores extend from the outer face of said disk and open partly
upon the face of said clutch-chamber and partly in the side walls thereof.
A pair of clutch-pins are driven into said pair of bores, their inner ends project-
ing into said clutch-chamber to act as clutches for said friction disk, and their
outer ends projecting from the periphery of the hub of said friction disk to form
lugs thereupon. The axial bore of said last mentioned gear-wheel being large
enough to clear said lugs or pins, said gear-wheel and friction disk can rotate
independently of each other. The inner face of said gear-wheel is adapted to
have frictional contact with the outer face of said friction disk; and I provide a
check-nut or washer which has frictional contact with the outer face of said gear-
wheed, and which surrounds the hub of said friction disk and has radial slots
that mesh with the outer ends of said clutch-pins, whereby said check-nut is
connected to turn in unison with said friction disk. The hub of said friction
disk projects beyond the outer face of said check-nut and is surrounded by an
adjusting ring that has internal screw-threads to mesh with the threads of said
hub, and external means to afford connection with a wrench when desired. The.
outer face of said adjusting ring rests against the inner face of the other side of
the swivel-head, and the respective lengths of said clutch-pins and said hub are
such that they will not engage said adjusting ring or the side of the swivel-head
under the maximum compression of said parts that can be effected by turning
said adjusting ring.
A main spindle is provided that is preferably pierced by a transverse bore that
is located about midway in the length of said spindle, said bore being adapted
to receive a clutch-bar. Each of the ends of the spindle is provided with an
'axial socket, and one of its ends with a friction disk of greater diameter than that

page_text: of said spindle. The other end of said spindle is decreased in diameter for a
short distance and screw-threaded. The screw-threaded end of said spindle
passes through one of the bores in the sides of the swivel-head, also through the
axial bore in the hub of the wheel friction disk, and through the clutch-chambers,
as well as through the axial bore of the other wheel, and out through the opposite
side of the swivel-head; and the above mentioned clutch-bar bore of said spindle
registers with the inlet that is provided in the side wall of the clutch-chamber.
A clutch-bar is inserted in the transverse bore in the spindle by passing it
through said inlet in the side wall of the clutch-chamber, and the clutch-bar is
thus located in the clutch-chamber, and can freely rotate therein. Said clutch-
bar is adapted to bear against the faces or bottoms of said clutch-chambers to
prevent said spindle falling out of its bearings, and to engage alternately with
the clutch-pins of said wheel and friction disk to transmit rotary motion from
said wheel or disk to said spindle to turn the latter in one or the other direction.
The height of said clutch-bar is preferably less than the distance between the
inner ends of the respective sets of clutch-pins of the wheel and friction disk to
permit said clutch-bar to be out of engagement with either of the gear-wheels
when desired,
Around the spindle and above the spindle friction disk herein previously named,
I place an externally threaded adjusting ring that is provided with means to
afford connection with a wrench when desired, and between said adjusting ring
and said spindle friction disk I interpose a check-nut or washer having radially
projecting lugs upon its periphery. An internally screw-threaded, cup-shaped
friction driven disk surrounds said spindle friction disk and meshes with said
adjusting ring, the walls of said friction driven disk being radially slotted to receive
the radially projecting lugs of said check-nut or washer, whereby said check-nut
and friction driven disk are connected to rotate in unison. Said friction driven
disk is pierced by an axial bore that registers with and is preferably the same
diameter as the socket of the spindle. I preferably interpose a friction washer
between the outer face of said spindle friction disk and the-inner face of said
friction driven disk, said washer having an axial bore of greater diameter than
the diameter of the axial socket of the spindle, whereby the walls of said socket
are indented by a concentric groove. Along said groove I preferably place a
spiral retaining spring, having its ends joined together. The friction driven
disk is also provided with a coupler-clutch consisting of two radially opposite
bores or clutch-slots which are located at equal distances from the center of
said disk. The friction washer is also provided with clutch-slots of greater
length in both directions than the clutch-slots in the friction driven disk, whereby
the friction disk coupler-clutches or clutch-slots become oppositely undercut.
A tap-holder is provided with a driving-body having an axial shaft or shark
projecting from its upper face to mesls with the socket of the spindle, and a pair
of coupler-clutches to mesh with the coupler-clutches of the spindle friction disk.
Said tap-holder coupler-clutches are preferably undercut on both of their driving
sides or faces to enable them to overlap the under cut clutch-slots of the spindle
friction disk to positively connect the tan-holder both rotatively and longi-
tudinally with the spindle. Said tap-holder shank is preferably provided with
a shoulder to engage the retaining spring in the socket of the spindle, said
shoulder being so located along the periphery of said shank that said shoulder
will be above said retaining spring before the coupler-clutches of the tap-holder
enter into engagement with the coupler-clutches of the spindle friction driven
disk, whereby said tap-holder is longitudinally connected with and supported by
said spindle, yet out of rotary engagement therewith, to enable the operator to
take hold of said tap-holder without injury. The pressure of the work against
a tool held in the tap-holder would push the shank farther up into the spindle
socket and cause the coupler-clutches of the tap-holder to engage those of the
spindle, whereupon said tap-holder will be positively connected with the spindle
in rotary-driving engagement. When it is desired to disengage said tap-holder

page_text: from the spindle a slight push of the operators hand will effect this by pushing
the undercut edges out of engagement, when gravity will cause the tap-holder
to fall out of rotary engagement with the spindle, its fall being arrested by the
retaining spring again engaging the shoulder of the shank, where the tap-holder
will stand still in the grasp of the operator, and can be pulled entirely out of
the spindle socket. The driving-body of the tap-holder is divided into two
driving-forks by a transverse jaw-slot. A ring surrounds said driving forks, and
its opposite sides are pierced by transverse aligned bores. A right and left
threaded screw is journalled in said bores of said ring, and means are provided
to prevent end movement of said screw in said bores. Two concentrically movable
screw-threaded jaws are located in said jaw-slot in mesh with said screw, the
height of said jaws being less than the height of said jaw-slot, to permit longi
tudinal adjustment of said jaws therein, and said jaws have latteral projections
that extend beyond their screw-threaded portions over and under said screw to
move said jaws with it when said screw is moved up or down by the movement
of the ring in which the screw is journalled and supported. The other side of
said jaws bears against the opposing side of the jaw-slot to hold said jaws in mesh
with said screw. One end of said screw is provided with a suitable connection
for a wrench; and the opposing surfaces of the jaws are provided with aligning
faces or V's to grip and center a tap or tool between theni. To locate said jaws
at certain intervals along said jaw-slot, the inner surface of the supporting ring
is corrugated to provide rack teeth to mesh with the corresponding teeth of a
spring-rack that is placed in a longitudinal slot or groove cut in the periphery
of one of the driving-forks, said groove being provided with a spring or springs
to push said rack into mesh with the teeth of the ring. Said longitudinal groove
is sufficiently deeper than the rack to permit the latter to be depressed below the
periphery of the driving-fork and out of mesh with the teeth of the ring. I
preferably depress the rack by means of a push-button that is counterbored into
the side wall of the supporting ring directly opposite the spring-rack, the outer
end of the push-button projecting beyond the periphery of the ring, and its
smooth inner surface being wider than the distance between the teeth of the rack,
to enable it to push the rack back and slide along the top of the teeth as the ring
is moved along the driving-fork of the tap-holder.. When the desired position
for the ring is reached, the push-button is released, and the springs push the rack
into mesh with the ring, and thus hold the ring, screw and jaws firmly in position.
The pressure of clamping anything between the jaws will bind the jaws in position
along the jaw-slot, but the spring-rack is more reliable when large taps are used.
The outer end of the tap-holder is preferably enclosed by a face-plate, having an
overlapping flange to confine the rack in place and bind the ends of the driving-
forks together. The upper end of the longitudinal groove also preferably
terminates in an undercut surface, to similarly confine the rack. at the other end.
While the lower set of aligning faces of the jaws may be of any usual centering
construction to grip and align the round shank of the tap, I have added an upper
set of driving faces that overhang the lower aligning faces and extend ther-
beyond at an accute angle to the line of motion of said jaws, to fill in the segments
removed from opposite sides of the periphery of the round shank to square the
head of the tap, and thereby form two driving faces that are always parallel with
each other and at a distance apart less than, but proportionate to, the distance
between said aligning faces of the jaws, which construction enables said driving
faces to engage the square head of a tap whose round shank is aligned between
the aligning faces of the jaws. For convenience in manufacture, I preferably
form the driving faces upon separate fingers or parts that are secured to the tops
of the jaws. The longitudinal adjustment of the jaws permits the tap to be pro-
jected at a greater or lesser distance from the end of the spindle as desired, to
enable it to cease rotating at the bottom of a hole cut by a drill at the other end
of the spindle, or one that may be inserted in the same socket in place of said

page_text: tap-holder. The standard length of a drill being usually greater than that of a
standard tap, and allowance being necessary to permit grinding of the drill.
Over the screw-threaded end of the main spindle slip an ejector-bushing
having an axial bore through which said spindle passes, and two equidistant
eccentrically located ejecior-bearings, each of said ejector bearings being provided
with a lug-slideway. The inner face of said ejector-bushing bears against and
is fastened to the opposing side of the swivel-head, its outer surface being reduced
in diameter to form a hub. Into the ejector-bearings I insert ejector-pins, each
having a lug that projects into its respective lug-slideway to prevent the ejector-
pin turning in its bearing. The end of each ejector-pin is divided into a stop-
face and an ejector-cam. A ring encircles said ejector-pins and is fastened to
each, and I hold said ejector-pins up in their bearings when not in use by raising
said encircling ring up around the hub of the ejector-bushing and securing it
thereto by a baynot lock, formed by turning the lugs of the ejector-pins out of
the tops of their lug-slideways. The screw-threads at this end of the main spindle
are interrupted by two oppositely located transverse bores that open in'o the
socket of the spindle. An internally screw-threaded flange or collar, having
opposite transverse hores that are internally counterbored to form spring-plates
therein, is screwed upon the end of the spindle until its transverse bores register
with those of the spindle. A locking-pin, having a shank of smaller diameter and
surrounded by B spiral spring and pierced by a transverse bore, is placed, shank
first, into each of the opposing transverse bores in the socket of the spindle,
the shanks of each passing through each of the bores of the counterbores and
projecting beyond the periphery of the flange. A cam-lug is then inserted into
each of the transverse bores of said shanks, and the springs of the locking-pins
being located between the larger diameters of the pins and the spring-plates of
the counterbores, extend the locking-pins into the socket of the spindle for a
distance limited by the lug on the shanks of the pins.
A drill-holder is provided with an axial shank adapted to fit into the spindle
socket, the upper end of said shank being tapered. A transverse bore passes
through the axis of the shaft, an! above said bore is a concentric groove; so that
when the shank is pushed up into the socket, its tapered end forces back the lock-
ing-pins, and the periphery of the shank slides past them until they extend into
the concentric groove of the shank and under the shoulder formed thereby in the
periphery of the shank, in which position they connect the shank longitudinally
with the spindle, and yet permit the shank and spindle to rotate independently
of each other. A further advance of the shank brings its transverse bore to
register with the locking-pins. which thereupon sink therein, to connect the
shank positively to rotate in unison with the spindle. I disengage the shank of
the drill-holder from the spindle by lowering the ring that is connected with the
ejector-pins, and thereby lower the ejector-pins until their stop-faces rest upon
the upper edge of the flange of the spindle, when their ejector cams will hang
down and project from the periphery of said flange. The rotation of the spindle
will cause the lugs of the locking-pins to pass over the non-rotative ejector-cams,
ard thereby withdraw the locking pins simultaneously from the socket of the
spindle, thus releasing the shank of the drill-holder, which will immediately com-
mence to fall by gravity; but the lugs pass the ejector-cams so quickly that the
pressure of the locking-pins is renewed upon the periphery of the shank before
they reach the concentric groove of the shank. Upon the lecking-pins again
slipping into the concentric groove of the shank said shank will be again supported
by the spindle and out of rotary engagement therewith, and the operator can rasp
it without injury to his hand, and when the lugs of the locking-pins again pass
over the ejector-cams, the shank is entirely released from the socket of the spindle.
The ejector-pins are then replaced in their bearings and secured there, and another
tool-holder may replace the one just withdrawn without stopping the spindle or
taling hold of a revolving piece of machinery, to which the workman is naturally
cpposed.

page_text: As a gripping means to hold the drill, I provide a screw-threaded, cup-shaped
ring, and screw it onto the bottom of the shank. Said ring has an
axial bore in its bottom or face-plate, and two sets of opposing trans-
veise bores in its sides. One of said sets of transverse bores are internally counter-
bered to form thrust-plates therein, and a right and left threaded screw is
journalled in said counterbores, its ends engaging said thrust-plates to prevent
end movement of said screw. Two concentrically movable jaws mesh with said
screw, their opposite sides being provided with a smooth slideway that registers
with the other set of transverse bores in the sides of the ring. A smooth guide-
rod is inserted through said transverse bores to mesh with said slideway pro-
vided in said jaws, and I provide means to hold said guide-rod from end move-
ment in said ring.
Dated this 10th day of December 1896.
ALLISON BROS.
Agents for the Applicant.
SPECIFICATION.
Improvements in Drilling and Tapping Machines.
I, FRANKLIN ALFRED ERRINGTON, of the Village of Edgewater (Stapleton, Post
Office), County of Richmond, State of New York, United States of America,
Mechanical Engineer, 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.
My invention relates broadly to means that may be employed for both rotating
a spindle in opposite directions, without in either case reversing the direction of
rotation of the primary driving member of a gear-train; also to means for bringing
the opposite ends of said spindle to register alternately with the same point;
also to means for locking said spindle in axial alignment with said point; also
to means for readily connecting and disconnecting a cutting tool with said
spindle; also to means for regulating the respective distances of the outer ends
of the cutting tools from the axis of the swivel-head; also to means for avoiding
breakage of the cutting tool when bottoming or under excessive strain; and
the invention relates, furthermore, to other novel details of improvement and
combinations of parts hereinafter set forth and then pointed out in the claims.
Reference is to be had to the accompanying drawings, wherein Figure 1 is a
front elevation of a machine embodying my invention; Figure 2 is a plan view
of the central portion of the inner face of one of the gear-wheels, showing the
arrangement of the clutch-mechanism, Figure 3, is a plan view of the top of the
wheel check-nut or washer, showing the slipjoint by which said check-nut or
washer is connected with its accompanying wheel-friction disk; Figure 4, is a
similar view of the slip-joint that connects the spindle check-nut or washer and
the spindle friction driven disk; Figure 5 is a vertical cross-section on the
line A, A, of Figure 1; Figure 6 is a view of the outer end of the ejector-bushing,
showing the ejector-ring and spindle in section; Figure 7 is a horizontal cross-
section of the drill holder on the line B B of Figure 5, the jaws and screw being
shown in full lines; Figure 8 is a top view of the spindle friction driven disk
showing the friction washer and a spiral retaining spring; and Figure 9 is a
horizontal cross-section of the tap-holder on the line C C of Figure 5, the cen-
tering and aligning mechanism being shown in full lines.
In carrying out my invention, I provide a swivel-head 1, having arms 1ª, 1b, and a
back-plate 1. forming a gear-cliamber to receive my improved driving mechanism
I connect said swivel-head 1, to a supporting frame 2, by a swivel joint, preferably
formed by an axial bore in the extension 1, of said swivel-head, which receives

page_text: a tapered projection 2, of the supporting frame 2. A concentric groove 2b, is
provided in the projection 2, to receive a roller or band 3, having a bore, to
receive the end of a screw 1°, by which means the swivel-head is held from longi-
tudinal movement upon projection 2, and yet can freely swivel thereon. The
screw 1°, is held from slacking back by a jam-nut 1', said swivel-head 1, and its
supporting frame 2, being preferably provided with an automatic locking mech-
anism to hold them from independent rotation when in certain positions. For
this purpose I have shown the frame 2, provided with an index bore or bores 2:
A locking-pin 1, is carried by the swivel-head 1, and a suitably arranged spring 1",
is located between said locking-pin 14, and a spring plate 1, which spring pushes
said locking-pin 18, into the index bore 2, whenever said bore registers with said
pin. Said locking-pin 1, is also provided with a handle. 1', to enable the operator
to withdraw the pin from bore 2, when it is desired to revolve the swivel-head 1,
upon its axis.
A shaft 2d, is shown journaled in the frame 2, and extending into the gear-
chamber of the swivel-head 1, its axis coinciding with that of said swivel-head.
A bevel pinion 4, is shown journaled in the back-plate 1°, and suitably secured to
the shaft 2d, to be rotated thereby.
Pinion 4, is preferably provided with two sets of driving faces 4", 4b, shown
in the form of bevelled gear-teeth, the pitch cone of one of said sets of gear teeth
preferably lying within that of the other; or said pinion 4, may be divided into
two concentric pinions, if preferred.
The top and bottom arms 1", 1", are each provided with a spindle bore or bear-
ing a, b, which are in line with each other. Two discs or wheels 5, 6, preferably shown
of different diameters and provided with gear-teeth that mesh respectively with the
inner and the outer sets of gear-teeth of the pinion 4. Each of said gear-wheels 1
is provided with an axial bore 5, 6, that registers with the respective bore a, b,
in arms 1, 1. By this construction the gear-wheel 5, is rotated at a slower
speed and is capable of exerting greater power than the gear-wheel 6. The outer
face of the gear-wheel 5, bears against the inner face of the arm 1",
and the inner face of said gear-wheel is provided with an axial
recess or clutch-chamber 7, and also an eccentrically located parallel bore or
bearing c, that is adapted to receive a clutch-pin 5. Said clutch-bearing opens
partly upon the face or bottom 7, of clutch-chamber 7, and indents the side wall
thereof, to form a supporting indenture 7, therein (see Fig. 2). A clutch-pin 5b,
is driven into said clutch-bearing and projects longitudinally from the face 7",
of the clutch-chamber 7, part of the periphery of said clutch-pin being embedded
in the supporting indenture 7b, and part thereof projecting laterally into said
chamber 7. The clutch-pins 5b, are preferably used in duplicate upon opposite
sides of said clutch-chamber to serve as clutches for the wheel 5. I also provide
a transverse inlet 5°, through the side wall of the clutch-chamber 7 (see Fig. 2).
The axial bore 6, of wheel 6, is of sufficient diàmeter to receive the screw-threaded
hub 9", of a wheel-friction disk 9, that is shown pierced by an axial bore 9*, pre-
ferably of the same diameter as the axial spindle bore 5* in wheel 5, and the
bores a, b; in arms 1°, 1b. The inner side of the disk 9, is provided with an axial
recess or clutch-chamber 8, and a pair of eccentrically located clutch-bores or
bearings 8, that extend from the outer face of said disk 9, and open partly upon
the face 8, of the clutch-chamber 8, and partly in the side walls thereof. A pair
of clutch-pins 9b, are driven into said clutch-bearings their inner ends projecting
into said clutch-chamber 8 to act as clutches for the disk 9, and their outer ends
projecting from the periphery of the hub 9, of the disk 9 to form lugs thereon.
The axial bore 6, of the gear-wheel 6, is of sufficiently large diameter to clear
the pins or lugs 9b, to permit said gear-wheel 6, and friction disk 9, to rotate
independently of each other when desired. The inner face of said gear-wheel 6,
is adapted to have frictional contact with the outer face of the friction disk 9;
and I provide a wheel-check-nut or washer 10, which has frictional contact with
the outer face of said gear-wheel, surrounds the hub 9, and is provided with

page_text: radial slots 10, in the side walls of its axial bore that mesh with the outer ends
of the clutch-pins 9b, whereby said check-nut or washer 10, is connected to rotate
in unison with the wheel friction disk 9 (see Fig. 3). The hub 9, projects beyond
the outer face of said check-nut 10, and is surrounded by a wheel-adjusting-ring 1!,
that has internal screw-threads to mesh with the screw-threads of said hub 9,
and is provided with external means 11" to afford connection for a wrench, when
desired to adjust said ring upon said hub. The outer face of the adjusting
ring 11, rests against the inner face of the arm 1b, and the respective lengths of
said hub 9", and said pins 9b, are such that said pins and hub will avoid engage-
ment with the opposing surface of said adjusting-ring 11, and the surface of the
arm 1, respectively under the maximum compression of said friction mechanism
that can be effected by turning said adjusting-ring 11, upon said hub 9. 12 is
a main spindle that is preferably pierced by a transverse clutch-bore located
about midway in its length, said bore being adapted to receive a clutch-bar 12"
The ends of the spindle 12 are respectively provided with an axial socket 12", 12",
One end of spindle 12, is increased in diameter to provide a flange or driving
friction disk 12, and the other end thereof is screw-threaded for a short distance
at 12. The screw-threaded end 12d, of the spindle 12, passes through the axial
spindle bore b, of the arm 1b, bore 9, of the wheel-friction disk 9, bore 5*, of the
gear-wheel 5, and out through the spindle bore a, of arm 1", When the trans-
verse clutch-bore of the spindle 12, registers with the inlet 5, of wheel 5, the
clutch-bar 12, may be passed through said inlet 5°, and thereby located in the
transverse clutch-bore of the spindle 12. The height of said clutch-bar 12", is
preferably less than the distance between the inner ends of the respective sets
of clutch-pins 5b, 9, to permit said clutch-bar to be out of engagement with both
of said sets of clutches when desired. It will be seen that the gear wheel 5,
meshes with one side of the pinion 4, and the gear wheel 6 with the other side
of said pinion, and that consequently said wheels 5, 6, will be rotated simulta-
neously in opposite directions by said pinion 4, and in the construction shown,
at different speeds. The length of said clutch bar 12", is sufficiently less than
the diameter of the clutch chamber 7, 8, to permit it to move freely therein to
enable it to engage alternately with the clutches connected with wheels 5 or 6,
to turn said spindle through the medium of said clutches and wheels, in one or
the opposite direction to perform the same operation at opposite points, without
swiveling the head (such as drilling holes in the opposed walls of a boiler), or
successive operations at the same point by swivelling the head or changing the tool-
holders, etc.
Around the spindle 12, between the flange or disk 12° and arm 1b, I place n
externally threaded spindle adjusting-ring 13, and provide said ring with suitable
means 13", to afford connection with a wrench when desired. Between said
adjusting ring and disk 12° I interpose a check-nut or washer 14, having radially
projecting lug or lugs 14, upon its periphery (see figure 4). A friction-driven
disk 15, is located on the opposite side of flange or disk 12, to that upon whi h
the ring 13 is placed, and said adjusting ring 13 and disk 15 are connected with
the annular wall 15b, through the medium of screw threads carried by the parts
13, 15. In the construction shown, the disk 15 and wall 15b, form a cup-shaped
friction-driven disk, which surrounds and extends under the flange 12". The
wall 15b, is provided with radial siots 15", to receive the lugs 14", of the check-nut
or washer 14. The disk 15, is pierced by an axial bore 15d, that registers with
and is preferably of the same diameter as the spindle-socket 12°, whereby a con-
unuous socket 12, 15, is formed. The outer face of the disk 15 is provided with
coupler-clutches, preferably shown in the form of diametrically opposite clutch-
apertures 15 that are located at equal distances from said axial bore 15. A
friction-washer 16 is preferably interposed between the opposed surfaces of the
spindle-friction disk or flange 12°, and the spindle-friction disk 15, and provided
with an axial bore or recess 16" of greater diameter than the spindle socket 12.
I place spring or catch 17 in the concentric groove thus formed in the wall of

page_text: the socket 120, 154, which spring or catch surrounds said socket and is extensible
thereinto. Said friction washer 16 is also provided with two bores or recesses 16b,
that register with, but are of greater diameter (or length) than the clutch apertures
15, of the spindle-friction driven disk 15, to render said coupler clutches 15°
under-cut on both of their driving sides or faces in opposite directions, or
oppositely under-cut (see figure 8).
To connect a tap or other tool 18, with the spindle 12, I have shown a tap-
holder having an axial shank or shaft 19, projecting from the disk or head 20,
of said tap-holder, and adapted to mesh with spindle socket 12, the upper end of
said shank being tapered to push lack the retaining spring 17, into its concentric
recess or groove 16", the upper and lower walls of said groove holding said spring
from longitudinal movement along said socket 12", upon the insertion of said
shaft therein. The upper surface of the disk or head 20, of the tap-holder, is also
provided with a coupler-clutch or clutches shown in the form of clutch pins 20°,
to mesh with the coupler clutches 15 of the spindle clutch-disk 15, the driving
sides or faces of said clutch pins 20 being preferably undercut at a right angle on
opposite sides or oppositely under-cut to overlap the corresponding under-cut
edges of the clutch apertures 15°, to connect said tap-holder both longitudinally
and rotatively with said spindle 12. The distance between the clutch faces of the
clutch pins 20° is greater than the distance between the undercut edges of the
coupler clutch 15, to enable the latter to pass between said clutch faces of the
clutch pins 20. The inner portion of the shaft 19 is preferably reduced in
diameter, at 19b, to provide a slideway to permit said shaft to slide independently
of said spring or catch 17, said reduced portion terminating in a concentric
shoulder 19, which is preferably lecated along said shaft a sufficient distance
above said clutch-pins 20°, to enable said shoulder 19", to be above said spring
or catch 17, before said clutch pins 20° enter the clutch apertures 15°, to connect
said shaft 19 longitudinally with said spindle 12, while permitting said tap-holder
and spindle to rotate independently. As a gripping means to centre and align a
tool or tap 18 and also to adjust said tool longitudinally at the desired distance
from the axis of the swivel-head 1, or any given point along the spindle 12, I have
divided the lower portion of the disk or head 20, of the tap-holder, into two aligned
pieces 20, 20°, by a jaw-chamber 20". A tubular body 21, surrounds the aligning
pieces 20ª, 20°, said tubular body 21, being preferably provided with two aligned
transverse openings 21", 21, in its opposed walls, one of said openings 21",
being preferably provided with a lateral recess 22, formed in its walls,
the end walls of said recess being employed as oppositely acting thrust-
plates 22", 22b to receive an internally threaded thrust nut 23, that is
preferably provided with a plurality of transverse bores 23. The end walls or
thrust plates 22, 22, of recess 22, are preferably located on opposite sides of
opening 21", to provide a bearing at 22", for the outer face of said thrust nut 23,
on one side, and a bearing at 22, for the inner face of said thrust nut 23, on the
opposite side, to prevent (or limit) the end movement of said thrust-nut in said
bedy 21, in either direction. To place the screw 24 in the tubular body 21, one
end 24", of said screw 24, is passed through the opening 21", whose novel con-
struction permits the screw 24 to pass through it at an angle to the centres of
the aligned openings 21", 21b, in body 21, until the other end 24b, of said screw
can be passed through the opposite opening 21b, to allow the end 24º, to he
sufficiently withdrawn from the opening 21", to permit the thrust nut 23 to be
laterally inserted in the recess 22, of the opening 21", between the oppositely
acting thrust-plates or end walls 22", 22h, thereof. The thrust nut 23 being
preferably screw-threaded, is screwed upon the screw 24, by inserting a capstan
bar alternately in the bores 23, Two screw threaded jaws 25, 26, are located in
the jaw-chamber 20º, and mesh with screw 24, the height of said jaws being
preferably less than the height of said jaw-chamber 20", to permit longitudinal
adjustment of said jaws, tubular body, and aligning pieces, relatively to each

page_text: other, for the purpose above mentioned. In the construction shown, the jaws
25, 26, are provided with lateral prejections 25", 20", that extend beyond their
screw-threaded portions over and under said screw 24, to connect said jaws longi-
tudinally with said screw, to move said jaws with said tubular body 21 (in which
said screw 24 is journaled and supported), along said aligning pieces 20ª, 20°.
The opposed surfaces of jaws 25, 26, are provided with centering faces or V's 20',
26b, to centre and align the tap 18 between them, and said centering V's 25,
26b, are brought in axional alignment with the body 21, by turning the thrust-
nut 23. Upon said V's becoming so aligned, a drill is inserted through one of
the holes 23, in the thrust-nut 23, and a hole 24", is drilled and preferably tapped
into the screw 24, and a plug, or preferably a screw 23, is inserted therein to
rigidly connect the thrust-nut 23 to turn with the screw 24. The construction
of the end walls or thrust plates 22", 22, of the opening 21" may be varied and
the form of the thrust nut 23 may be correspondingly changed, and still permit
said parts to co-operate to hold the screw 24, from end movement in the body 21,
and enable said screw to actuate the jaws 25, 26, universally to and from the
centre of the body 20, 21. It is readily seen that, where the longitudinal adjust-
ment is not desired, I may make the openings 21", 21, circular bores, and so
located that the top of the jaws 25, 26, bear against the top of jaw chamber 20,
when the screw 24, is in operative position in said openings 21", 21, in which
case the jaws 25, 26, may be held in axial alignment with the tubular body 21,
by said jaws bearing upon said top of said jaw-chamber 21", and the device woul
be operatively complete, the screw 24 both centering and driving a tool 18, he:d
between the V's of the jaws 25, 26.
Said
While the lower (or outer) set of aligning faces 25b 26b, may be of any usual
centering construction to grip and align the round shank of a tap or tool 18, I
have added an upper or inner set of driving faces 25°, 26°, that overhang the lower
aligning faces 25, 26, and extend therebeyond at an acute angle to the line of
movement of the said jaws 25, 26. Said driving faces 25, 26, are by this con-
struction enabled to occupy the space provided in removing the segments from
the periphery of the round shank in squaring the head of the tap 18.
driving faces 25, 26, should be parallel with each other at a distance apart pro-
portionate to the distance between the aligning faces 25, 26b. This construction
permits the driving faces 25, 26, to engage opposite sides of the square head of
the tap 18, while the round shank of the tap is gripped and aligned by the
aligning faces 25, 26b. For convenience in manufacturing I have preferably
fomed the driving faces 25°, 26", pon separate pieces or fingers that are secured
to the jaws 25, 26 (see figure 9).
Te locate the jaws 25, 26, at certain intervals along the jaw chamber 20", the
inner surface of the supporting tubular body 21 is preferably formed with
corrugations or indentures to provide rack-teeth 21°, to mesh with the correspond-
ing teeth of a spring-rack 20, that is placed in a longitudinal groove 20%, cut in
the periphery of one of the aligning pieces 20°, said groove 20% being provided
with a spring or springs 20, placed under the rack 20, to push said rack into
mesh, with the rack 21. The longitudinal groove 20%, is sufficiently deeper than
the rack 20 to permit the latter to be depressed below the periphery of the align-
ing piece 20°, and entirely out of mesh with the rack 21°. I preferably depress
the rack 20' by means of a push button 21, that is located in an internal counter-
bo: in the side wall of the tubular body 21, directly opposite the rack 20. The
ourer end of the shank of the push button 21 projects beyond the periphery of
the body 21 when said racks are in mesh. The inner surface of said push button
is a smooth surface of greater diameter than the distance between the inner ends
of the teeth of rack 20' to both push back the rack 20', out of engagement with the
rack 21°, and to slide along the tops of the teeth of said rack 20, as the tubular
body 21 is moved along the aligning pieces 201, 20°. When the desired position
is reached for the jaws 25, 26, the push button 21d, is released and the springs 20h
push the rack 20', into mesh with the rack 21°, and thereby connect the body 21

page_text: and the centering and aligning mechanism carried by said body with the aligning
pieces 20, 20, to prevent further movement thereupon. The lateral pressure
exerted by the screw 24 upon the jaws 25, 26, when clamping any object between
said jaws, will, in the construction shown, bind said jaws in position along the
aligning pieces 20°, 20°; but, I preferably provide the racks 20, 21°, as being
more reliable. The outer end of the tap holder is preferably enclosed by a face-
plate 20, having an overlapping flange 20", to confine the rack 20 in place, and
to bind the lower ends of the aligning pieces 201, 20%, together. The upper end
of the longitudinal groove 20% also, preferably, terminates in an undercut sur-
face 20%, to similarly confine the rack 20 at its upper end.
Over the screw threaded end 124, of the main spindle 12, I slip an ejector bush-
ing 33, having an axial bore 33", through which said spindle. passes, and two
equi-distant eccentrically located ejector hearings 33, each of said ejector bear-
ings being provided with a lug-slideway 33. The inner face of said ejector bush-
ing bears against and is fastened to the opposing side of the arm 1", of the swivel-
had, by the screws 33, its outer surface being reduced in diameter to form a
hub. Inte the ejector bearings 33 I insert ejector pins 34, each having a lug 34
that projects into its respective lug-slideway to prevent the ejector pin from turn-
ing in its bearing. The end of each of said ejector pins is divided into a stop-
face 34, and an ejector-cam 34°. A ring 35 encircles said ejector-pins and is
fastened to each by screws 35", and I hold said ejector-pins up in their bearings
when not in use by raising said encircling ring up around the hub of the ejector
bushing and securing it thereto by a bayonet-lock, formed by turning the lugs 34",
of ejector pins 34, out of the tops of their lug-slideways into the lug-chamber 5".
The screw threads at this end of the main spindle 12 are interrupted by two
oppositely located transverse hores that open into the socket 12b, of the spindle 12.
An internally screw-threaded flange or collar 36, having opposite transverse
beres, 36", that are internally counter-bored to provide spring-plates therein, is
screwed upon the end of the spindle 12, until its transverse bores 36, register with
those of the spindle 12. A locking-pin 37, having a shank 37", of smaller
diameter (preferably shown flattened) and surrounded by a spiral spring 38, and
pierced by a transverse bore, is placed, shank-first, into each of the opposing
transverse bores in the socket of the spindle 12, the shanks 37", of each of said
lecking pins 37, passing through each of the bores of the counterbores, and pro-
jecting beyond the periphery of the flange 36. A cam-lug 37°, is then inserted
into each of the transverse bores of said shanks 37", and the springs 38, of the
locking pins being located between the larger diameters of the pins and the
spring-plates of the counter-bores, extend the locking pins 37, into the socket 12b,
of the spindle for a distance limited by the lug 37, on the shanks of the pins 37.
A drill holder is provided with an axial shank 39, adapted to fit into the spindle
socket 12, the upper end of said shank being tapered at 39, and the lower end
thereof flanged at 39. A transverse bore 39, passes through the axis of the
shaft 39, and above said bore is a concentric groove 394; so that when the shank 39
is pushed up into the socket 12, its tapered end forces back the locking pins 37,
and the periphery of the shank 39 slides past said locking pins until they extend
into the concentric groove 39d of the shank 39, and under the shoulder 39, formed
thereby in the periphery of the shank 39, in which position they connect the
shank, 39 longitudinally with the spindle 12, and yet permit the shank 39 and
spindle 12 to rotate independently of each other. A further advance of the
shank 39 brings its transverse bore 39° to register with the locking pins 37, which
thereupon sink therein, to connect the shank 39 positively to rotate in unison with
he spindle 12, I disengage the shank 39, of the drill-holder, from the spindle 12,
y lowering the ring 35. Said ring being connected with ejector pins 34, said
'ns are thereby lowered with said ring until their stop-faces 34b, rest upon the
upper edge of the flange 36 of the spindle 12, whereupon their ejector cams 34°
vill hang down and project from the periphery of said flange 36. The rotation
i the spindle 12 will cause the lugs 37° of the locking pins 37 to pass over the

page_text: n.n-rotative ejector cams 34°, and thereby withdraw the locking pins 37
simultaneously from the socket 12b of the spindle 12, thus releasing the shank 39
of the drill-holder, which will immediately commence to fall by gravity; but
the lugs 37 pass the ejector camis 34°, so quickly that the pressure of the locking
pins 37 is renewed upon the periphery of the shank 39 before said pins reach
the concentric groove 39 of the shank. Upon the locking pins 37 again slipping
into the concentric groove 39d of the shank 39, said shank will be again supported
by the spindle 12, and out of rotary engagement therewith, and the operator can
freely grasp the drill-holder without injury to his hand, and when the lugs 37°,
of the locking pins 37, again pass over the ejector cams 34°, the shank 39 will be
entirely released from the socket 12, of the spindle 12. The ejector pins 34
are then replaced in their bearings 33, and secured therein, by above-mentioned
Layonet-joint, or other suitable means; and another tool-holder may replace the
one just withdrawn without stopping the spindle 12 or taking hold of a positively
driven revolving piece of machinery, to which the workman is naturally opposed.
As a gripping means to hold a drill 40, I provide a screw-threaded, cup-shaped
ring 41, and screw it to the flange 39b of the shank 39. Said ring 41 has an axial
bore 41", in its bottom or face-plate 41b, and two sets of opposing transverse
bores 41°, 41d, in its sides. Both bores of one of the sets of transverse
bores 41°, are internally counterbored to form thrust-plates 41°, 41, therein, and a
right-and-left-threaded screw 42 is journaled in said counterbores, its ends engaging
said thrust plates 41, 41, to prevent end movement of said screw.
Two con-
centrically movable jaws 43, 44 mesh with said screw 42, the opposite sides of
said jaws being provided with a smooth slide-way 45, that registers with the other
set of transverse bores 41d, in the sides of the ring 41. A smooth guide-rod 46,
is inserted through said transverse bores 41d, to mesh with said slideway 15, pro-
vided in said jaws 43, 44, and I provide means to hold said guide-rod 46 from end
movement in said ring 41.
The longitudinal adjustment of the jaws 25, 26, of the tool-holder 20, 21, permits
the respective tool or tap 18, to be projected at a greater or less distance from the
axis of the swivel-head 1, to insure the cessation of the rotation of the tap upon
its arriving at the bottom of the hole cut by the drill 40, at the opposite end of
the spindle 12, or one that may be inserted in the same socket 12°, in place of the
tap-holder.
The operation of the parts described is as follows:
It being desired to drill and then tap a blind or bottom hole (one that does not
go through the metal) without moving the work, a drill 40, is secured in one tool-
holder, as 41, and a tap 18, in the tool-holder 20, 21, etc., then
the outer end of the tap 18, may be adjusted so as to bring the
respective ends of the drill 40, and tap 18, at such distances from the axis
of the swivel-head 1, as will enable the tap 18, to cease rotating upon arriving at
the bottom of the hole cut by drill 40, in the work. Upon the swivel-head 1,
being moved toward the work (or vice versa, the work toward the swivel-head),
the pressure of the drill 40, against the work will raise the drill-holder 41, into
rotary engagement with the spindle 12, through the medium of the transverse
bore 39, and locking-pins 37, as above explained. The continued pressure of the
drill against the work raises the spindle 12, in its bearings and brings the clutch-
bar 12, into engagement with the quickly rotating clutch-pins 9b, and the
spindle 12, and drill 40, will thereupon be rotated in the working direction, say
to the right hand, by the pinion 4, through the medium of the gear-wheel 6, and
friction disks 9, 10. The tension of the friction disks 9, 10, and wheel 6, having
been properly adjusted, should the drill 40, meet with undue resistance in cutting
the hole desired in the work, the frictional surfaces of said parts 9, 10, 6, will slip
over each other and permit the spindle 12, and drill 40, to cease rotating, without
interrupting the rotation of the members 4, 5, 6 of the gear-train. Either the
swivel-head 1, or the mechanism by which the work is moved towards the swivel-
head, is provided with a stop; so that when said stop arrests the approach of the

page_text: swivel-head 1, to the work, the drill 40, will be relieved of pressure and cease
cutting. The drill 40, is thereupon withdrawn from the hole, the locking-pin 15,
withdrawn from the index-bore 2", the swivel-head 1, revolved half-around on its
axis until the pin 15, enters the diametrically opposite index-bore 20, whereupon
the tap 18, will be in axial alignment with the hole just drilled in the work.
The pressure of the tap 18, against the work will raise the tap-holder coupler-
clutches 20°, into engagement with the spindle clutch-apertures 15°, and the
clutch-bar 12", of the spindle 12, into engagement with the slowly rotating clutch-
pins 5b, whereupon the tap 18, will be rotated in the cutting or working direction,
say to the right hand, by the gear train 4, 5. The tension of the friction disks 14,
15, is adjusted against the spindle friction disk 12", by the adjusting ring 13, to
drive the tap under usual conditions, but if the work becomes too severe, the
frictional surfaces of the disks may slip over each other, and the tap will cease to
rotate without interrupting the rotation of the spindle 12. It will thus be seen
that the adjusting ring 13, can be adjusted while the spindle is rotating, and the
tapping of the first hole will secure the exact adjustment for future holes under the
same conditions of metal, etc., which is an improvement over previous construc-
tions of adjustable frictions. As above stated, the tap 18, is preferably adjusted
so that it will stop rotating at the bottom of the hole cut by the drill 40, and this is
preferably arranged by having the end of the tap 18, the depth of the engaging
surfaces of the clutch-bar 12", with clutch-pins 5b, nearer the axis of the swivel-
head 1, than the end of the drill 40, in order that when the stop above mentioned
arrests the approach of the work and swivel-head towards each other, the spiral
action of the tap 18, in the hole in the work, will draw the clutch-bar 12, out of
engagement with the clutch-pins 5b, and the tap 18, and spindle 12, will thereupon
cease to rotate without interrupting the rotation of the gear-train 4, 5, 6. The
coupler-clutches 15°, 20°, being undercut, as above described, to a greater degree
than the wheel clutch-pins 5b, enables said coupler-clutches to remain in engage-
ment while the tap draws the spindle 12, longitudinally, as aforesaid. Upon
moving the swivel-head 1, and the work away from each other, the tap 18, will be
held in the work, and the swivel-head 1, will slide along the spindle 12, and bring
the clutch-bar 12", into engagement with the quickly rotating clutch-pins 9b,
which, as above explained, are rotating in the opposite direction to the clutch-
pins 56, and will therefore back the tap 18, out of the work with a quick return.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
1. The combination of a swivel-head, a spindle carried thereby and having each
of its ends provided with means for connection with a tool or tool-holder, and a
reversing mechanism also carried by said swivel-head to rotate said spindle in
opposite directions, Substantially as described.
2. The combination of a spindle having each of its ends provided with means
for connection with a tool or tool-holder, means to turn said spindle in opposite
directions means to swivel said spindle to bring its ends to register alternately
with the same point, and an automatic locking-mechanism to lock said spindle
automatically in axional alignment with said point, substantially as described.
3. The combination with a supporting frame, of a swivel head connected there-
with by a swivel-joint, a pinion projecting into said swivel-head, two
concentric wheels journaled in said swivel-head, and meshing with
said pinion, two clutches, one of said clutches being connected with one of said
wheels and the other of said clutches with the other of said wheels, a spindle, the
axis of said spindle being concentric with the axis of said wheels, and a third
clutch located between said wheel-clutches and connected with said spindle, sub-
stantially as described.
4. The combination with a supporting frame, of a swivel-head connected there-
with by a swivel-joint, one of said parts having an index bore or bores and the

page_text: Or
other of said parts having a locking-pin pins to mesh with said index bore or
bores to lock said swivel-head at certain intervals to said supporting frame, a
pinion projecting into said swivel-head, two wheels journaled in said swivel-head
and meshing with said pinion, two clutches, one of said clutches being connected
with one of said wheels and the other of said clutches with the other of said wheels,
a spindle provided with a clutch or clutches for engagement with said wheel
clutches, substantially as described.
5. The combination of a swivel-head adapted for connection by a swivel-joint
with a supporting part, a pinion projecting therein, two concentric wheels journ-
aled in said swivel-head and meshing with said pinion, one of said wheels being of
greater diameter than the other, two clutches, one of said clutches being con-
nected with one of said wheels and the other of said clutches being connected
with the other of said wheels, and a spindle provided with a clutch or clutches for
engagement with said wheel-clutches, substantially as described.
6. The combination of a bevel pinion carrying two sets of driving faces, the
pitch cone of one of said sets of driving faces lying within that of the other, two
concentric bevel wheels meshing respectively with said sets of driving faces of
said pinion,
a spindle, means for connecting said spindle alternately with either
of said wheels and means for swivelling, said spindle, substantially as described.
7. The combination of a wheel having a recess or clutch-chamber in its face
and an eccentrically located longitudinal bore opening partly on the face of said
recess or clutch-chamber and indenting the side wall thereof, a clutch-pin located
in said bore and projecting longitudinally from the face of said recess or clutch-
chamber, a part of the periphery of said clutch-pin being embedded in the sup-
porting indenture thus provided in the side wall of said recess or clutch-chamber,
and part thereof exfending laterally into said recess or clutch-chamber, whereby
said clutch-pin is relieved from the shearing strain, and a spindle provided with a
clutch to engage said clutch-pin, substantially as described.
8. The combination of two wheels and means to rotate said wheels in opposite
directions, one of said wheels having a recess or clutch-chamber in its face and
an eccentrically located longitudinal bore opening partly on the face of said
recess or clutch-chamber and indenting the said wall thereof, a clutch-pin located
in said eccentrically located bore and projecting longitudinally from the face of
said recess or clutch-chamber, part of the periphery of said clutch-pin being em-
bedded in the supporting indenture thus provided in the side wall of said recess
or clutch-chamber and part thereof extending laterally into said recess or clutch-
chamber, a. clutch connected with the other of said disks, and a spindle having
a clutch or clutches to engage either of said disk-clutches, substantially as
described.
9. The combination of two wheels and means to rotate said wheels in opposite
directions, each of said wheels having a central bore or hearing, one of said wheels
having a recess or clutch-chamber within the plane of its inner face, a clutch-pin
connected with said wheel and projecting from the face of said recess or clutch-
chamber, the inner end of said clutch-pin also lying within the plane of the inner
face of said wheel, another clutch connected with the other of said wheels, a spindle
journaled in said bores or bearings of said wheels, and a clutch connected with
said spindle to engage said wheel-clutches, substantially as described.
10. The combination of a friction disk, a screw-threaded hub projecting there-
from, a wheel surrounding said hub, a screw-threaded adjusting ring to mesh
with said screw-threaded hub to move one of said parts longitudinally, and a
check-nut or washer to hold said adjusting ring in position when adjusted, sub-
stantially as described.
11. The combination of a friction disk having a screw threaded hub, a wheel
surrounding said hub, one of said parts being provided with a positive clutch, a
screw threaded adjusting ring meshing with said screw threaded hub, to move 5
one of said parts longitudinally, a check-nut or washer to hold said adjusting ring

page_text: in position when adjusted, and a spindle having a clutch adapted to engage said
disk-clutch, substantially as described.
12. The combination of a driving friction disk, a friction driven disk sur-
rounding said driving friction disk, and having a concentric screw-threaded bore,
an externally screw threaded adjusting ring independent of said driving friction
disk located in and meshing with said screw-threaded bore of said frictiondriven.
disk to adjust the tension of the frictional contact of said disks, said adjusting-
ring having a concentric bore to admit means for connecting said driving friction
disk with a rotative part, and a check-nut or washer to hold said adjusting ring
in position, substantially as described.
13. The combination of a driving friction disk, a spindle projecting therefrom,
a screw threaded adjusting-ring surrounding said spindle, a check-nut or washer
interposed between said adjusting-ring and said driving friction disk, and a
friction driven disk located on the other side of said driving friction disk and
provided with screw-threads to mesh, with the screw-threads of said adjusting
ring, said check-nut or washer and said friction driven disk being connected
together to turn in unison by 2 slip-joint whereby said last mentioned parts can
have independent longitudinal movament towards and from each other, sub-
stantially as described.
14. The combination of a driving friction disk, a spindle projecting therefrom,
a screw-threaded adjusting-ring surrounding said spindle, a check-nut or washer
interposed between said adjusting ring and said driving friction disk and pro-
vided with a lug upon its periphery, a cup-shape friction driven disk having a slot
in its side wall to receive the lug of said check-nut or washer and also having
screw-threads to mesh with the screw threads of said adjusting-ring, substantially
as described.
15. The combination of a spindle having an axial socket, said spindle being
provided with a clutch to enable it to impart rotary motion, the walls of said
axial socket being indented by a concentric groove, and a spring extending along
said groove and extensible into said socket, substantially as described.
16. In a drilling and tapping machine, the combination of a spindle provided
with a clutch and having an axial socket, the walls of said socket being indented
by a concentric groove, a spiral spring placed along said concentric groove, and
a shaft adapted to enter said socket and provided with a clutch to engage said
spindle clutch, said shaft having a shoulder to co-act with said spring to connect
said shaft longitudinally with said spindle, substantially as described.
17. In a drilling and tapping machine, the combination of a spindle having
one of its ends provided with an axial socket, a coupler-clutch connected with
said end of said spindle, and an independent shaft adapted to enter said socket
and provided with a coupler-clutch to engage said spindle couples-clutch,
substantially as described.
18. In a drilling and tapping machine, the combination of a spindle having
one of its ends provided with an axial socket, a coupler-clutch connected with
said end of said spindle and having under-cut edges on opposite sides, and a
shaft adapted to enter said socket and provided with a coupler-clutch having
opposite sides oppositely under-cut to engage said spindle coupler-clutch,
substantially as described. .
19. The combination of a spindle having a flange and an axial socket, a disc
connected with said flange said disk having an axial bore and being provided with
a coupler-clutch, and a tool-holder having an axial shaft to enter said socket
and a coupler-clutch to engage said coupler-clutch of said disk, substantially as
described.
20. The combination of a spindle having a flange and an axial socket, a disk
connected with said flange and having an axial bore that registers with said
socket, said parts having an axial recess of greater diameter than said axial
socket and located between their opposed surfaces, a retaining spring located
along the groove thus formed in the wall of said socket and extensible into said.

page_text: socket, said disc having a coupler-clutch and a tool-halder having an axial
- shaft to enter said socket, and a coupler-clutch to engage said coupler clutch,
substantially as described.
21. The combination of two parts 12° and 20 provided with coupler-clutches,
the coupler-clutches of one of said parts having opposite sides oppositely-under-
cut, and a coupler-clutch of the other part having clutch-faces adapted to engage
with said undercut coupler-clutch, the distance between the clutch faces of the
second-mentioned coupler-clutch being greater than the distance between the
undercut edges of the first mentioned coupler clutch, to enable the latter to pass
between said clutch-faces, substantially as described.
22. The combination of two parts 12 and 20 one of said parts being provided
with a coupler-clutch having opposite sides oppositely undercut at a right-angle,
and the other of said parts having a coupler clutch provided with correspondingly
undercut clutch-faces, the distance between said clutch-faces of the second
mentioned coupler-clutch being greater than the distance between the undercut
edges of said first mentioned coupler-clutch, to enable the latter to pass between
said clutch faces-substantially as described.
23. The combination of two wheels each of said wheels being provided with a
clutch, means to rotate said wheels in opposite directions, a shaft having a coupler
clutch, a spindle having a clutch to connect snid spindle with either of said
wheels, and a coupler-clutch to connect, said spindle with said shaft, said coupler-
clutches being undercut to a greater degree than said wheel-clutches, to enable
said coupler-clutches to remain in mesh to draw said spindle-clutch out of
engagement with either of said wheel-clutches, substantially as described.
24. In a drilling and tapping machine, the combination of a spindle having an
axial socket, the walls of said socket being indented by a concentric groove, an
independent shaft adapted to-be inserted into and removed from said socket during
the rotation of said spindle, a catch carried by one of said parts, means to connect
said spindle and shaft together in rotary driving engagement, said shaft having
a shoulder so located along the portion of said shaft that enters said socket, that
said catch, said shoulder and said groove are in co-operative position to connect
said spindle and said shaft longitudinally together before said shaft enters into
rotary-driving engagement with said spindle, substantially as described.
25. In a drilling and tapping machine, the combination of a spindle having
an axial socket, and a catch extensible into said socket, with an independent shaft
whose diameter permits it to be freely inserted into and removed from said
socket during the rotation of said spindle, and means to connect said spindle and
shaft together in rotary-driving engagement, said shaft having a shoulder that
is so located along the periphery of said shaft that said shoulder is above or
within said catch, before said spindle and shaft enter into said rotary-driving
engagement to connect said spindle and shaft longitudinally together while per-
mitting one to rotate independently of the other, substantially as described.
26. The combination of a spindle provided with a coupler-clutch and having
an axial socket, a catch carried by said socket and extensible into said socket,
an independent tool-holder provided with a coupled-clutch and having an axial
shaft adapted to be inserted into and removed from said socket during the
rotation of said spindle, said shaft having a shoulder that is so located along the
periphery of said shaft that said shoulder is above said catch before said coupler-
clutches enter into rotary-engagement to connect said spindle and shaft longi-
tudinally together, said shaft also having a cylindrical slideway of reduced
diameter extending below said shoulder, at a distance greater than the depth
to which the coupler-clutches mesh when in rotary engagement, to enable said
shaft to slide independently of said catch to permit said coupler-clutches to engage
and disengage, substantially as described.
27. The combination of a rotative spindle having an axial socket, a locking-
pin carried by said spindle and extensible into said socket, said locking-pin being
provided with a lug, a non-rotative part, an ejector-cam connected with said non-

page_text: rotative part, and means to move said ejector-cam to and from engagement with
said lug of said locking-pin, substantially as described.
28. The combination of a rotative spindle having an axial socket, a locking-
pin carried by said spindle and extensible into said socket, said locking-pin
being provided with a lug, a non-rotative part, and a longitudinally-movable
ejector-cam, said non-rotative part and said cam being connected together by
a ship-joint located eccentrically to the axis of said spindle to hold said cam from
rotation with said spindle during the engagement of said cam with lug of said
locking-pin, substantially as described.
29. The combination of a rotative spindle having an axial socket, a locking-
pin carried by said spindle and extensible into said socket, said locking-pin
being provided with a lug, a non-rotative part and a longitudinally movable
cam connected with said non-rotative part and adapted to operate said locking-
pin, said spindle also having a flange to arrest the longitudinal movement of
said cam, substantially as described.
30. The combination of a rotative spindle provided with an axial socket and
having a transverse bore opening upon said socket, a spring plate provided in
a part which is an extension of the transverse bore of said spindle, a locking
pin also provided with a spring-plate and located in said transverse bore of said
spindle, a spiral spring surrounding said locking-pin and located between said
spring-plates to extend said locking-pin into said socket, and cam mechanism
to withdraw said locking-pin from said socket, substantially as described.
31. In a drilling and tapping machine, the combination of a spindle having
an axial socket and a'catch extensible into said socket with an independent shaft
whose diameter permits it to be freely inserted into and removed from said
socket during the rotation of said spindle, and means to connect said spindle
and shaft together in rotary driving engagement, said shaft having a shoulder
that is so located along the periphery of said shaft that said shoulder is abové
said catch before said spindle and shaft enter into said rotary driving engagement
to connect said spindle and shaft longitudinally together while permitting one to
rotate independently of the other, substantially as described.
32: In' a drilling and tapping machine, the combination of a spindle having
an axial socket, a locking pin carried by said spindle and extensible into said
socket, with a shaft adapted to enter said socket and provided with a transverse
bore and a shoulder located along its periphery between said transverse bore and
the inner end of said shaft, substantially as described.
33. The combination of two serew-threaded jaws, each of said jaws having a
smooth slideway on the opposite side of its center to that upon which it is screw-.
threaded, a ring surrounding said jaws and having two sets of opposing transverse
bores in its sides, a right and left threaded screw journaled in one of said sets of
transverse bores and meshing, with the screw-threaded side of said jaws, a smooth
guide-rod located in the other of said sets of transverse bores and meshing with
said slideway of said jaws, and means to prevent end movement of said rod and
screw, substantially as described.
34. The combination of a body having two jaws, means to move said jaws
towards each other, the lower portions of said jaws having opposed aligning faces,
the upper portions of said, jaws overhanging said lower portions and having two
parallel driving faces extending inward beyond said lower aligning faces at an acute
angle to the direction of movement of said jaws, substantially as described.
35. The combination of a body having two jaws, means to move said jaws
towards each other, said jaws being provided with aligning faces and a pair of
fingers fastened to said jaws, above said aligning faces, each of said fingers being
provided with a driving face that is parellel to that of the other and which extends
inwards beyond its associate aligning face at an acute angle to the direction. of
movement of said jaws, substantially as described.
36. The combination, of two screw-threaded jaws, a tubular body surrounding
said jaws and having an opening in its side walls, a right and left screw meshing

page_text: with said jaws and having a portion located in said opening, said body at said
opening being provided with means to prevent end movement of said screw in
said body and means to retain the opposed faces of said jaws parellel with the
axis of said body, substantially as described.
37. The combination of two screw-threaded jaws, a tubular body surrounding
said jaws and having a transverse opening or openings and provided with
oppositely acting thrust-plates, a right and left threaded screw-meshing with said
jaws and adapted to engage said thrust-plates to prevent end movement of said
screw in said body and means to retain the opposed faces of said jaws parellel
with the axis of said body, substantially as described.
38. The combination of two screw-threaded jaws, body surrounding said
jaws and having an opening in its side walls, a right and left threaded screw
meshing with said jaws and having a portion located in said open-
ing a thrust-nut located in said opening and connected with said.
screw to resist end movement thereof, said body being provided
with means to prevent end movement of said thrust-nut in either direction and
means to retain the opposed faces of said jaws parallel with the axis of said body.
39. The combination of two screw-threaded jaws, a tubular body surrounding
said jaws and having an opening in its side wall, a right and left threaded screw
meshing with said jaws and having a portion located in said opening a thrust-nut
attached to said screw to turn therewith and journalled in said opening, the outer
face of said thrust-nut having a bearing against the inner surface of said body and
the inner face of said thrust-nut having a bearing against the outer surface of
said body, to prevent end movement of said screw in said body in either direction,
and means to retain the opposed faces of said jaws parallel with the axis of said
body.
40. The combination of two screw-threaded jaws, a tubular body surrounding said
jaws and having an opening in its side wall, a right and left threaded screw
having a portion located in said opening, a thrust-nut attached to said screw to
turn therewith and journaled in said opening, the wall of said opening being
indented by a lateral recess in which is located said thrust-nut and which recess
has ends walls that hold said thrust-nut from end movement in either direction,
and means to retain the opposed face of said jaws parallel with the axis of said
body, substantially as described.
41. The combination of two screw-threaded jaws, a tubular body surrounding
said jaws and having a transverse opening or openings provided with oppositely
acting thrust-plates, a right and left threaded screw meshing with said jaws and
adapted to engage said thrust-plates to prevent end movement of said screw in said
bedy, and an aligning-piece located between said jaws and the inner wall of said
body and connected with said body to rotate in unison therewith, substantially as
described.
42. The combination of a tubular body, a centering and aligning mechanism
surrounded by said body, said body and said mechanism being longitudinally
Inovable, the one along the other, and means to connect said mechanism to said
Lody to rotate in unison therewith, substantially as described.
43. The combination of two screw-threaded jaws, a tubular body surrounding
said jaws, a right and left threaded screw meshing with said jaws, an aligning
piece interposed between said jaws and said body, said aligning piece and said body
being longitudinally movable, the one along the other, substantially as described.
44. The combination of a driving part, another part connected to rotate there-
with, and longitudinally movable therealong, two jaws supported by said longi
tudinally movable part, means to move said jaws towards each other, and means
to lock said longitudinally movable part at intervals along said driving part,
substantially as described.
45. The combination of a driving part, two screw threaded jaws, a right and
left threaded screw meshing with said jaws, said jaws and screw being connected
to rotate in unison with and being longitudinally movable along said driving

page_text: part, and means to lock said jaws to the driving part to prevent said longitudinal
movement.
46. The combination of two screw-threaded jaws, a tubular body surrounding
said jaws, a right and left threaded
and left threaded screw meshing with
said jaws,
means to prevent end movement of said screw in said body, and an align-
ing piece, said aligning piece and said body being longitudinally movable, the one
along the other, the one having an indenture or indentures and the other a pro-
jection or projections to mesh with said indenture or indentures to lock one of
said last named parts at certain intervals along the length of the other.
47. The combination of two jaws, a tubular body surrounding said jaws, a right
and left threaded screw located on one side of said jaws, means to prevent end
movement of said screw in said body, and an aligning piece located between the
outer side of said jaws and the inner wall of said body, one side of said jaws
bearing upon said aligning-piece and the other side of said jaws being
screw threaded to mesh with said screw and having projections that extend beyond
said screw-threaded portions over and under said screws, said aligning piece and
said body being longitudinally movable the one along the other, whereby the
lateral pressure exerted by said screw-threaded parts when under strain will,
serve to clamp said last named parts together.
48. The combination of a part having a rack, a spring located under said rack,
another part having a rack to mesh with said first mentioned rack, and a push button
carried by said second mentioned part and provided with a plane surface to bear
directly upon the ends of the teeth of said first mentioned rack to disconnect said
racks.
Dated this 30th day of August 1807