Improvements in Metal-screw Machines.
Year: 1890

page_text: COMPLETE SPECIFICATION.
Improvements in Metal-screw Machines.
I, ERNESTE ROTHLISBERGER, of Lima, in the County of Allen, and State of
Ohio, United States of America, Machinist, 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 inventio relates to improvements in machines for making bolts, the object
being to provide means whereby the bolts may be turned down cylindrical, threaded,
and cut from a straight rod rectangular in cross-section; and it consists in the
construction and novel combination of parts hereinafter described, illustrated in the
accompanying drawings, and pointed out in the claims hereto appended.
In the accompanying drawings, in which similar letters of reference designate
corresponding parts,
Fig. 1 represents a side elevation of a machine embodying the invention.
Fig. 2 represents a central vertical longitudinal section thereof.
Fig. represents a vertical transverse sectional view on the liner of Fig. 1,
but with some parts slightly out of said line to show the interior arrangement
thereof.
Fig. represents a vertical transverse section ou the line y y of Fig. 1, to show.
the connecting-gearing.
Fig. 5 represents a longitudinal section of the worm-wheel, turret, turret-slide,
and connected parts, on the line of Fig. 6.
Fig. 6 represents a detail plan view to further illustrate said parts.
Fig. 7 represents a detail longitudinal sectional view on the line of the
mechanism to hold and release the turret.
Figs. 8, 9, 10. and 11 are detail views, some sectional, showing the construction
and operation of the clutch for the bolt-rod.
Figs. 12 and 133 represent similar views of the feed-clutch for said rod.
Fig. 14 is an end view of the roughing and threading die holder.
Fig. 15 is a side view of said holder.
Fig. 1 is a plan view of the same.
Fig. 17 is an axial section of said holder with the dies opened apart.
Fig. 18 is a similar section with the dies closed.
Figs. 19 and 20 are detail views of the holder and dies.
Fig. 21 is a plan view of the worm-wheel with cams attached.
Fig. 22 is a section on the line of Fig. 21.
Referring to the drawing by letter, & designates the main frame of the machine,
supported upon suitable legs at its corners and having a horizontal bed a, which
supports the portions of the main frame above itself and the bed-block on which
the turret-slide, hereinafter described, moves. aa are standards rising from said
beda, and having similar bearings aa at their upper ends.
is a supporting-arm projecting horizontally forward from the front standard a',
and is a similar arm projecting similarly forward and then descending to unite
with the arm 5.
B designates a sleeve turning in the front bearing, and is a drive-pulley
secured to said sleeve just to the inner or rear side of said sleeve. The sleeve
carries on its opposite or outer end a gear-wheel, preferably integral therewith.
C is a long hollow spindle or shaft with its front portion inserted in the sleeve B,
the adjacent end of which is flush with the outer surface of its middle portion, as
shown in Fig. 2.
c is a pulley about equal in size to the drive-pulley b, turning loosely on the
spindle C, the circumferential shoulders of the spindle being adjacent to the

page_text: hub of the pulleys. The said pulleys may be driven by belts from any convenient
motor and rotate in opposite directions, having suitable teeth and, respectively,
on the facing ends of their hubs, that engage corresponding teeth 011 a clutch
thimble or sleeve mounted on the middle portion of the spindle C, and hereinafter
more fully described.
D is a horizontal shaft, Figs. 1 and 3, mounted in suitable bearings secured to
the main frame at one side thereof and passing through an opening in the lower end
of a bearing-bar d, secured by bolts or otherwise to the front portion of the main
frame. Upon the front end of the shaft D, to the outer side of the bearing-bar, is
secured a gear-wheel d, that meshes with the lowest of a series of gear-wheels d d³ d',
respectively, that are mounted on short shafts each having a bearing in the bar d,
at a suitable point therein. The said gears intermesh from above downward.
highest wheel meshes with the gear-wheel 61 on the sleeve B, and the gear-
wheels dd dd diminish suitably in diameter upward, to give the lowest wheel d
the proper and desired rate of speed.
The
The shaft D has upon it between the bearings, secured to the main frame at the
side of the bed-block for the turret-slide, a worm e, which meshes with a large
horizontal worm-wheel E, mounted on the upper end of a vertical shaft e that
turns in hearings made on or secured to the main frame. Upon the shaft e¹ is a
bevel gear, meshing with a similar gear upon a horizontal shaft F, that turns in
bearings depending from the main frame. The said shaft F operates the bolt-rod-
gripping mechanism, the feeding mechanism, the reversing mechanism, and the bolt
threading and cutting mechanism, and is itself rotated from the drive-pulley b and
sleeve B by means of the connective gearing-shafts, worm-wheel, and worum
herein before described.
The bolt-rod-gripping mechanism is constructed as follows:-
Gis a hollow supporting-shaft surrounded by the spindle C, and with the bolt-
rod X passing axially through it from its feed end, the rods being suitably supported
by a collar or perforated block entering said end. The outer or feed end of the
shaft G is enlarged or provided with a cylindrical head g, having a circumferential
groove in which is seated a ring g', suitably divided and connected to and within
the arms of the bifurcated upper end of a lever g³ by pivotal screws. (See Fig. 3.)
The said lever has a longitudinal slot about midway of its length, through which it
is pivoted upon the side of the arm of the main frame, and at its lower end is
pivoted between the arms of a bifurcated block on anti-friction rollers g³, that bear
against a cam-edged flange of a cam-disk g, mounted on the shaft and turning
therewith. The anti-friction roller g³ and lower arm of the lever are drawn into
the concavity of said cam-roller by a spring g³, that connects said arm and the main
frame.
Upon the inner or discharge end of the hollow spindle C is screwed a cylindrical
head H, having a hollow interior, through which the bolt-rod X passes, and in
transverse opposite slots in said head move the gripping-jaws h, that hold the
rod when it is being cut, the said slots and jaws being rabbeted on corresponding
edges to keep the latter in place, as seen in Fig. 11. The jaws have V-shaped
notches in their ends to grip the bolt-rod, and are provided with openings for the
insertion of the heads of the gripping-levers hs, that lie in longitudinal recesses h¹
in the head H and are pivoted on the bolts or pivotal rods therein. The arms
of said levers are connected by short links with the inner end of the hollow
shaft G, the said links passing through suitable openings in the hollow spindle C.
Thus when the shaft G is drawn outward by the lever and cam the ends of said
arms are drawn together and the jaws moved outward, releasing the rod, so that
the latter can be fed into the machine. When the shaft G is moved inward by the
lever, the action is reversed, and the jaws hold the bolt-rod while it is being cut
and formed.
The following is a description of the construction of the bolt-rod-feeding
mechanism.
I is a slotted lever similar to the lever g² and similarly pivoted to the arm a of

page_text: the main frame, and is an anti-friction roller mounted on the lower end of the
lever I and engaging against the cam-flange of a cam-disk , secured upon the
shaft F. The upper end of the lever I is bifurcated and connected by pivotal pins
or screws to a suitable ring, seated in a circumferential groove in the cylindrical
enlargement of a clutch-sleeve, having an inwardly-looking conical part
adjoining said enlargement.
J is a slide or carriage frame moving over the arm a of the main frame upon
flanges at its upper edges or plates bolted thereto and having depending arms, in
the outer or front one of which the clutch-sleeve has a bearing, while in the
inner depending arm the central boss j of a cylindrical block has a bearing.
are jaws sliding in transverse diametrically opposite recesses in the block,
having V-shaped notches in their ends to grip the bolt-rod and provided with
openings to receive the heads of the short gripping-levers, that lie in longitudinal
recesses in the block . Said levers are pivoted upon the pins je and have their
arms bent inward to rest upon the conical parts of the clutch-sleeve, so that when
the lever I moves the said sleeve inward the said conical part will move said arms
apart, and will consequently close the jaws on the bolt-rod. It will also move the
bolt-rod, carriage-frame, and cylindrical block inward, or in the direction of feed.
and to cause said frame and block to cease motion immediately at the end of each
stroke of the clutch-sleeve a spring 7 is secured centrally to the carriage-frame
by a bolt or otherwise, and has on its ends little blocks, which pass through openings
in the frame and bear against the under surface of the arm a of the main frame,
which gives the necessary friction to accomplish the desired result.
At openings of the clutch-sleeve, cylindrical clutch-block, and other parts, the
bolt-rod is supported in proper line by collars or perforated blocks, as shown. A
coiled or other spring 18, connecting the lower arm of the lever I and the main
frame, returns the clutch-sleeve after being moved inward by said lever. The parts
are so arranged that the feed mechanism and gripping mechanism act alternately,
one being at rest when the other is in action. By this means the bolt-rod can be
fed up, released by the feed mechanism, and then held by the gripping mechanism
till the bolt is cut and made.
The mechanism to reduce the rod and thread the bolt is constructed as follows;
R is a tool-holder or cylindrical turret to hold the reducing and thread-cutting
dies, of which there are preferably six in number, three being roughing-tools and
three threading-tools, a fuller description of which is hereinafter given. The said
turret is provided with equidistant recesses or openings for the reception of the
respective tools, Fig. 5, and is attached by a central vertical stem to the turret-
slide, which is preferably rectangular and reciprocates upon its supporting-bed
in suitable ways or guides made in the upper face of the latter. The worm-
wheel E has in its upper face the annular recesses, preferably three in number,
concentric with its centre, which recesses are T-shaped in construction. To the
worm-wheel are attached by bolts or pins, the heads of which rest in said annular
recesses, the series of pairs of curved edged cams, the members of each pair being
designated, respectively. The number of pairs of said cams is equal to that
of the tools, both roughing and threading, attached to the turret-in this instance
six. The operating-edges of said cams are more or less concave, and their points
stand nearly out to the rim of the worm-wheel, from which the cams incline inward,
the smaller reversing-cams in the opposite direction to and at a steeper inclina-
tion than the direct-acting cams . The points of the reversing-cams also are
slightly rounded on their operating-edges, as shown.
is an anti-friction roller mounted on the lower end of a stud, depending from
the turret-slide in the central line thereof near its outer or rear end and secured
to said slide by a threaded stem and bolt, as shown. The said friction roller is
engaged by the point of one of the direct-acting cams and moved inward in a
straight line by the concave operating-edge thereof as the worm-wheel rotates till
it reaches the heel of said cam, operating when it engages against the operating-
edge of the corresponding oppositely-inclined cam 5, which moves it as far outward

page_text: To
again. Of course the reciprocation of said rollers by means of the stem causes
the turret-slide to reciprocate, and the reciprocation of the turret-frame causes the
roughing and threading tools attached to the turret to move up to and from their
work. The stem k reciprocates in a suitable slot in the turret-slide support or
bed. (See Fig. 5.) Of course the turret must turn the sixth part of a rotation
after each tool has operated to bring the succeeding tool in alignment to operate,
and when said tool is in operation the position of the turret must be fixed.
accomplish the rotation, a wheel L, Figs. 5 and 6, having six equidistant hook-
points, is secured to the lower end of the turret-stem in a large recess 7 in the
turret-slide, and a lever, having an upturned point, with its edge adjoining the
upper edge of the shank inclined to slip over an obstruction, is pivoted in a recess
in the slide-support, communicating with the recess in the turret-slide, a spring
being secured in an outer or rearward extension of the recess and bearing down-.
ward upon the heel of the hook-lever to keep the latter horizontal and, with its
-point erect. When the direct-acting cams move the turret-slide inward, the point 7
of the lever will strike against one of the hook-teeth of the wheel 7 and turn said
wheel one-sixth of a rotation. The turret then becomes locked by means. herein-
after described, and the slide being returned outward the inclined edge of the
point will ride under the succeeding tooth and will be brought into position again
by the spring
"
The following is a means to lock the turret when in position. (See Figs. G
and 7.)
L
15 15 are six' equidistant vertical recesses in the base of the turret, any one of
which may be turned to register with an opening passing down into the long
recess in the turret-slide. In said recess is pivoted a double-armed lever,
having a head on one end that enters and holds in a notch in the side of a pin 18,
that stands up and down in the recess 16, with its point ready to pass through the
opening therefrom into one of the recesses 15 in the turret. The opposite end of
said lever has its end inclined inward and downward and is pressed down upon by a
spring, secured in the recess 1º.
'
710 is a cam having an edge inclined downward and inward and pivoted in a
slot in the slide-support below the recess 16 in the turret-slide. When the turret
and slide move far enough outward or rearward, the inclined edge impinges on the
outer end of the lever 17, and thereby depresses the pin 18, so that the turret becomes
unlocked from the slide and can be rotated by the described means. The unlocking
happens just as the hooked lever and wheel are about to rotate the turret, and
after said rotation the turret and slide are moved in the opposite direction. and the
spring causes the pin to again lock the turret..
The bolt-rod X is rotated by a sleeve-spindle and hollow shaft, through which it
passes, and the tools attached to the turret do not rotate, but are merely moved up
to and from their work by the mechanism described. Any style of die for said tools
may be use; but the modification hereinafter described is that preferred. To use
'said dies the tool or die-holder must be made to receive said dies, and therefore
must have a particular construction. M is one of said die-holders, having a hollow
stem m, adapted to be received into one of the recesses made therefor in the turret.
Outward from the said stem is the enlarged cylindric portion m', having three
equidistant longitudinal slots m², and outward from said cylindrical portion are three
similar equidistant radially-diverging blocks m³.
N is a cam-sleeve sliding on the part m of the die-holder and having at its end
nearest thereto a circumferential cam-flange, having the outer inclined cam side n.
n is a rod standing axially in the die-holder and threaded therein, upon which
threaded part are the adjusting-nuts n³ ³, the latter of which is connected with the
sleeve N by the three rods or screws m³, that pass through the slots m². Thus the
sleeve N' and bolt or rod n must move together, being connected by said screws.
The nut n³ has a threaded boss that screws into a corresponding recess in the nut n²,
and o causés' the nuts to lock together.
00-are screw-cutting-dies having rabbeted edges to slide in corresponding radial

page_text: recesses made for them in the outer portion m³ of a die-holder M. The inner
ends of each of said dies, which are three in number in each holder, has a proper
concave cutting-edge, while its outer end is provided with a longitudinal open
recesso to receive the end of a lever o³, that lies in a longitudinal recess in the
corresponding block m³, and has a rounded inward enlargement o³, that is pivoted to
said block m³ inward from the die therein on a transverse bolt, as shown.
o is a bar or arm having on one end a rounded head that fits in a similar socket o
in the inner edge of the lever o³, its other end having a head of, the end edge of of
which inclines in such a direction as to rest upon the inclined side n of the flange of
the cam-sleeve N.
08 are adjusting-screws that pass threaded openings in the inner ends of the
levers 03 and bear upon the corresponding bars of. As the outer ends of said levers
press inward on the threading-dies, it is evident that any wear of said dies can be
taken up by turning the screws o" inward.
090 are coiled springs seated in recesses o10 in the die-holder and pressing
outward against projections on the inner surfaces of the dies, to force the latter
outward when they have been relieved from the pressure of the levers o³.
is an anti-friction roller mounted on a più depending from the cam-sleeve N
and bearing against the side of a curved cam o¹³, secured to the turret-slide, but
not concentric with the turret, the anti-friction roller engaging the surface of the
cam outward from the turret at the end of the cam which is nearer the latter, so
that the said roller and consequently the sleeve N will be drawn slightly away from
the turret and the inclined edges of of the arms or bars of until the adjacent ends of
the said bars rest upon the flange of the sleeve N and the levers o drive the dies
inward into position to cut.
When the turret has been turned in position and the dies have threaded the bolt,
the end of which comes in contact with n (Fig. 17) thereby pushing back sleeve N,
and relieving lever 0³, this opens the dies and they can be withdrawn from the
threaded bolt without reversing the machine.
PP, Fig. 3, are cutter tools or knives mounted by suitable means upon tool-
holders pp, and held thereto by set-screws, as shown. The said posts are attached
to and held upon carriages or slides ppl, moving transversely upon ways made upon
suitable portions of the main frame above the slots p2p therein.
p³ ³ are similar double-armed levers pivoted on the main frame at proper points
and with the heads on their upper ends entering sockets in the lower surfaces of the
blocks p* p*, which are held in place within the recesses in the under surfaces of the
carriages by the adjusting-screws p p of ordinary construction.
Pare anti-friction rollers attached to the lower ends of the levers p³, p³, which
rollers bear against the cams p³ 27, secured upon the shaft F and turning therewith.
The motion of the knives inward when the cams and levers move. the carriages
inward severs the bolt from the bolt-rod. This takes place immediately after the
roughing and threading mechanism have been drawn from the bolt.
4
pare coiled springs connecting the levers with the main frame and returning
the knives outward after the bolt is severed.
When no means are provided for separating or opening apart the thread-cutting
dies after cutting the threads, the said dies could not be withdrawn without stripping
the threads. To prevent this when ordinary threading-dies are used, the following
mechanism is attached:
Qis a clutch thimble or sleeve splined on the spindle C, between the pulleys b
and c, and provided with teeth g g at its opposite ends, that respectively mesh with
the teeth on the adjacent ends of the hubs of said pulleys, one pulley being in
gear with said thimble when the other is out of gear therewith and the pulleys being
rotated in opposite directions.
q3 is a suitably-divided ring seated in a circumferential groove in the thimble Q,
and R is a double-armed lever pivoted to the main frame at a proper point and with
its upper end bifurcated and straddling said ring, to which the arms of the bifurcation
are connected by pivotal pins or screws r.
Attached to the lower end of said lever

page_text: is a bifurcated' block; in which is mounted an anti-friction roller that bears
upon the cam-edge of the circumferential flange of a cam-disk S, mounted on the
shaft F.
is a spring connecting the lower arm of the lever R with the main frame. When
the anti-friction roller is on the uncut or straight edge of the flange of the cam-
disk S, the lever liolds the clutch-thimble coupled to the pulley, and the spindle C
rotates in the proper direction for the roughing and thread-cutting dies to operate
on the bolt-rod; but when said roller descends into the hollow of the cam-flange,
the springs uncouples the clutch-thimble from the pulley, thereby reversing the
motion of the spindle C, causing the bolt-rod to turn in the direction in which the
threading-dies can disengage themselves therefrom without stripping the threads.
Thus by the described mechanism the square bolt-rgd is fed by the feed-jaws,
into the hollow supporting-shaft at regular intervals, and when the said jaws close
to act, the gripping-jaws hold the bolt-rod while the bolt is roughed and threaded
and severed from the rod.
'
Having now particularly described and ascertained the nature of my said inven-
tion, and in what. manner the same is to be performed, I declare that what I
claim is:
1. In a bolt-making machine, the combination of the carriage-frame sliding on an
arm of the main frame, the spring secured centrally to said carriago-frame and
having blocks or pins on its ends that pass through suitable openings and bear on
the main frame, the cam-sleeve having a bearing in the outer depending arm of the
carriage-frame and provided with 'a conical cam-surface, the cylindrical block having
a boss journalled in a bearing in the inner depending arm of the carriage-frame, the
feed-jaws sliding in recesses in said block, the levers pivoted in recesses in the block
with their outer ends resting on the conical cam-surface of the cam-sleeve and their
heads in openings in the feed-jaws, and mechanism, substantially as described,
whereby the sleeve can be slid sufficiently far in between the levers to cause the jaws
to grip the bolt-bar and thereby cause the carriage-frame, sleeve, and block to move
together in the direction of feeding, substantially as specified.
2. The combination, with the carriage-frame, the spring attached thereto and
provided with end blocks to provide friction 'on the main frame, the cam-sleeve and
block having bearings in the depending arms of the carriage-frame, the sliding feed-
jaws and the pivoted levers with their heads in openings in said jaws, and their outer
ends resting on the conical part of the cam-sleeve, of the slotted lever pivoted to
the main frame and having its upper end attached to a ring in a circumferential
flange of the cam-sleeve, and a cam secured to a longitudinal shaft rotated by the
drive-pulley by means of connecting-gearing and operating upon the lower end of
the lever to move the cam-sleeve outward against the action of a spring which
moves inward, substantially as specified.
3. In a bolt-making machine, the combination of the hollow supporting-shaft
sliding slightly in and out of the rotary spindle, the hollow cylindrical head
secured upon the inner end of said spindle, the gripping-jaws sliding in transverse
recesses in said head, the levers pivoted in recesses in said head with their heads
in openings in said jaws, and the links connecting the ends of said levers with the
adjacent end of the hollow shaft, substantially as specified.
4. The combination, with the hollow supporting-shaft, the rotary spindle, the
hollow cylindrical head, the gripping-jaws, the pivoted levers in the head, and the
links connecting said levers and the adjacent end of the hollow shaft, of the slotted
lever pivoted to the main frame and connected at its upper end with a ring in a
circumferential groove in the hollow shaft, the anti-friction roller on the lower end
of said lever, the cam bearing against said roller, and the spring connecting the
lever and main frame and acting against the cam, substantially as specified.
19.
5. In a bolt-making machine, the combination of the feed mechanism comprising
the sliding carriage-frame, friction-spring, cam-sleeve, cylindrical block, feed-jaws,
and the gripping mechanism' comprising the hollow supporting-shaft, rotary spindle,

page_text: cylindrical head, gripping-jaws, levers operating said jaws, and links connecting
said levers to the hollow shaft of the levers, cams and springs constructed
substantially as described, and causing said mechanisms to act alternately,
one mechanism being at rest while the other is in operation, substantially as
specified.
6. The combination of the sleeve carrying the driving-pulley, the gear-wheel on
said sleeve, the longitudinal shaft mounted in bearings secured to the main frame,
the gear-wheel on the front end of said shaft, the gearing connecting said gear-
wheel and that on the sleeve, the worm on said longitudinal shaft, and the worm-
wheel mounted on a vertical shaft and operating all the roughing-out and threading
mechanism, substantially as specified.
7. The combination of the sleeve carrying the driving-pulley, the gear-wheel on
said sleeve, the longitudinal shaft having a gear-wheel on its front end connected to
the gear-wheel on the sleeve by intermeshing gearing, the worm on said shaft, the
worm-wheel, the vertical worm-wheel shaft, the horizontal shaft carrying the
cams to actuate the severing, reversing, gripping, and feeding mechanisms, and
the gearing connecting said shaft and the worm-wheel shaft, substantially as
specified.
8. The combination of the turret, the turret-slide, the worm-wheel having
annular concentric recesses in its upper face, the direct acting and reversing cams
attached to said worm-wheel by means of said recesses and bolts or screws, the stud
depending from the turret-slide, and the anti-friction roller on the end of said stud
to engage the said cams, substantially as specified.
9. The combination, with the turret, the vertical central turret-stem, the toothed
wheel on the lower end of said turret-stem, the turret-slide, and the stud depending
from the turret-slide through a slot in the slide-support and having an anti-friction
roller ou its lower end, of the worm-wheel, the canis attached thereto, the hooked
lever in a recess in the turret-slide support and projecting into a recess in said
slide, and the spring pressing on the heel of said lever to keep the point thereof
erect, substantially as specified.
10. The combination, with the turret having recesses in its base, the turret-slide
having a recess communicating with any one of said locking recesses through au
opening, the stud depending from the turret-slide with an anti-friction roller on its
end, the worm-wheel and cams attached thereto to operate upon said roller and
stud, of the pin in the recess in the slide, the double-armed lever pivoted in said
recess with a head on one fitted in a notch in said pin, the spring to press down the
opposite arm of the lever, and the cam pivoted in a slot in the turret-slide support
to raise said end when the slide moves inward and thereby draw down the pin
unlocking the turret, substantially as specified.
11. The combination, with the stud depending from the turret-slide, the worm-
wheel and the cams thereon, of the toothed wheel on the turret-stem, the hooked
lever, the spring to depress the heel of said lever, the locking-pin, the spring
bearing on said lever, and the cam to act on the lever and depress the locking-pin
to unlock the turret just before the hooked lever has operated upon the toothed
wheel, substantially as specified.
12. The combination, with the knives, the tool parts to which said knives are
attached, the carriages bearing said parts, and the adjustable recessed blocks
below and within said carriages, of the double-armed pivoted levers with their
heads in the recesses in said blocks, the cams on the shaft F to throw said heads
inward, and the springs to reverse the motion of the levers, substantially as
specified.
13. The combination, with the two pulleys rotating in opposite directions and having
clutch-teeth on the facing ends of their hubs, of the clutch-thimble splined on the
rotary spindle and having clutch-teeth on its respective ends to engage said clutch-
teeth, the ring in a circumferential groove in said thimble, the double-arm pivoted
lover having its upper end attached to said ring, the cam on the shaft F acting on

page_text: the lower ends of said lever, and the spring acting on a lever in a direction opposite
to that of the cam, substantially as specified.
14. The combination, with the turret and the curved cam on the turret-slide
adjacent to but not concentric with the turret. of the die-holder attached to the
turret and having longitudinal slots in its central portion, the cam-sleeve sliding
upon said portion and provided with an inclined circumferential ram-surface, the
rod in the hollow stem of the holder connected by nuts and screws or pins that pass
through the said longitudinal slots in the holder, with the cam-sleeve, the roughing
and threading dies, the levers pivoted in recesses in the holder and bearing on
said dies, the bars or arms connected to said levers with their heads resting on the
cam-sleeve in such a manner that the inclined ends of said heads can ride upon the
inclined surface of the cam-sleeve flange, and the pin or stud depending from the
cam-sleeve and preferably provided with an anti-friction roller to bear against
the curved cam on the turret-slide and force the cam-sleeve inward with relation
to the said arms or bars, and thereby tilt the levers and drive the dies inward,
substantially as specified.,
15. The combination, with the turret and curved cam on the turret-slide not
concentric with the turret, of the die-holder, the cam-sleeve sliding thereon, and
provided with a circumferential inclined cam-surface, the rod in the stem of the
holder connected by jam-nuts and screws or pins passing through slots in the holder
with the cam-sleeve, the dies sliding in recesses in the holder, the pivoted levers
bearing on said dies, the bars or arms connected to the said levers and having heads
formed to ride up the inclined surface of the cam-sleeve, the pin or stud depending
from said sleeve and having an anti-friction roller to engage the curved cam on the
turret-slide, and the coiled springs in recesses in the holder bearing against lugs or
projections on the dies outward when released. by the levers, substantially as
specified.
16. The combination, with the tool-holder, of the sliding dies, the cam-sleeve
sliding on the holder, the levers pivoted to the holder and bearing on said dies, the
arms or bars having at their inner ends rounded heads inserted in sockets in the
levers and at their outer end heads provided with outer inclined edges to slide
upon the inclined surface of the cam-sleeve, and the adjusting-screws passing
through threaded openings in the levers and bearing on the outer heads of the
corresponding bars or arms, substantially as specified.
17. The combination, with the tool-holder having longitudinal slots at proper
points, of the cam-sleeve sliding on said holder, and the rod in the hollow stem of
the holder connected by jam-nuts and screws or pins passing through said slots to
said sleeve, whereby when the end of said rod strikes the end of the screw just made
the sleeve connected to said rod is carried outward in relation to the bars attached to
the levers which move the dies inward and the latter are permitted to be pressed
outward by suitable springs, substantially as specified.
Dat this 15th day of October 1890
F. W. BARKER,
Applicant's Agent.