IMPROVEMENTS IN OR APPERTAINING TO BOLT AND NUT SCREWING MACHINES
Year: 1885

page_text: DE BUITICATION.
I, WILLIAM PHILLIPS THOMPSON Fel Inst P. A. of the Agency for Foreign
Patent Solicitors, 6 Lord Street, Liverpool' in the County of Lancaster, and
323 High Holborn in the County of Middlesex Civil Engineer do' hereby declare
the nature of the said invention for "IMPROVEMENTS IN OR APPERTAINING TO
BOLT AND NUT SCREWING MACHINES" (a communication' from abroad' by James
W. Adams of Chicago in the state of Illinois, United States of America, Inventor)
and in what manner the same is to be performed, to be particularly described
and ascertained' in' and' by the following statement:-
14041
This invention relates to improvements in bolt threading machines in which' a
revolving split-head or die carrier is automatically actuated to advance the threading
dies or chasers towards or withdraw them from the bolt on a line radial' to the
axis of rotation of the head and of the dies, and without stopping or reversing' the
machine.
The objects of this invention are to bodily actuate the two parts of a split head,
without closing up the ends of the space between them; and by this means have at
all times a free and unobstructed passage for the escape from the head of cuttings
resulting during the threading process.
To connect the split head and sliding, collar in such a manner that the strain
upon the head and the connection when opening and closing the head will be in a
straight line, and a connection of such character as to exclude dust from its joints,
and yet readily removable when from any cause defective.
To provide a directly operating lock independent of, but co-operating with the
connection for opening and closing the head, which lock shall be of such a nature
that when in operation the connection' referred to shall be entirely relieved from
strains,
Further objects of this invention are involved in details of construction herein-
after described, the more important of which are those for gauging the size of
arews to be cut, the length of the screw' thread, and for connecting, and adjusting
the several parts for causing the head to automatically open and close at desired.
intervals

page_text: These objects are attained by devices illustrated in the accompanying drawings,
in which
Figure 1 represents a side elevation of a bolt-threading machine embodying the
invention.
Figure 2, a plan view thereof.
Figure 3, a horizontal sectional view on line x-x Figure 1.
Figures 4 and 5, respectively, Tront and side elevations of the shifting yoke.
Figure 6, a detail perspective of one of the adjustable stops.
Figure 7, a transverse vertical section on line 2-2 Figure 1.
Figure 8, detail views of the shifting lever.
Figure 9, a plan view of a portion of the machine, showing it with devices
attached when used for threading nuts.
Figure 10, a detail sectional view on line y-y Figure 9.
Figure 11, a perspective view of the nut-pusher.
Figure 12, a side elevation of the revolving cutter-head shown in a closed
position with a portion of the side broken away to show relation of lock-pin and
socket.
1
Figure 13, a similar view of the head, open.
Figure 14, a front elevation of the same, showing the head closed.
Figure 15, a similar view, showing the head open..
Figure 16, a plan view of the head in a closed position.
Figure 17, a similar view, showing the head open.
Figure 18, a central vertical longitudinal section, showing the head closed.
Figure 19, a similar view of the head open and
Figure 20, a detail perspective of the actuating guide-bar.
Similar letters of reference indicate the same parts in the several figures of the
drawing.
'A indicates a frame or casting which supports the operating parts of the
invention, provided with an extension or table A¹, which forms a support for the
chuck-carriage B which feeds the blanks to the dies.
The upper portion is hollow and forms a receptacle A³, for the oil, as indicated
by dotted lines in Figure 1.
Journalled in a suitable casing C, located at the rear end of the table is a hollow
shaft D, carrying on its rear end a cog-wheel E¹, which through the medium of
spur-wheel a, and belt-pulleys b imparts a rotary motion to the shaft.
To the other end of the shaft D is screwed or otherwise secured the grooved
head-block E, in the grooves of which slide the tongues of the carriers or split-
heads F F.
When screwed into position on the shaft, the end of the shaft and face of the
head-block are flush, thus forming a smooth surface upon which the die carriers
slide.
The bore in the hollow shaft is of sufficient diameter to admit of the passage of
the largest bolt upon which the die-carriers can operate.
The die carriers F, which are when taken together approximately circular in
cross-section, are provided with tongues G, which work in the groove s, in the
head-block, and form guides for the die-carriers when opening and closing.
Radial slots are provided in the front face of the die-carrier for reception of the
dies H, which dies are rigidly secured in their respective slots by the screws I.
The dies are adjusted to the desired size or diameter of screw to be cut, by means
of screws J, projected through the periphery of the split-head in line with the
dies, which screws also take up the strain on the dies when in operation.
The screws I serving more in the capacity of auxiliary supports to prevent the
dies from becoming unseated or falling too much to the center.
The same result could be accomplished in various ways, such for instance by
forming a swivel connection between the die H and screw J, in which case the
screw I could be omitted entirely, or its place supplied by a "keeping-plate."

page_text: Near the inner face in the center of the die-carrier, and projecting upwardly
and forwardly from its periphery, is cast or otherwise rigidly secured a double
inclined tongue K, which projects into a double inclined slot K¹, in the end of the
guide-bar L, which. bar is rigidly secured to the flanged sleeve H, working loosely
upon the shaft D just to the rear of the head-block E.
For convenience of substitution in case of wear, it is found preferable to make
the tongue K detachable, as shown in Figs. 18 and 19, by means of a spindle c
Bcrew-threaded on the end, and projecting through the die-carrier, and a recess
formed on the under face of the carrier in which to counter-sink the nut d for
securing the tongue in place.
.
.
The guide-bar L is rigidly secured to the flanged sleeve M by the set-screw e and
is provided with flanges fto form a dove-tail guiding connection between the
sleeve M and head-block E.
The double inclined slot K¹ in the outer end of the guide-bar works on the
tongue K when forced in or out by the movement of the sleeve M on the shaft D,
and causes the split-heads F.to approach and recede on a radial line from their
center.
The flanged sleeve M, the movement of which causes the head to open and close,
is connected to the head-block E by the guide-bars L, and working loosely upon
the shaft B has a longitudinal movement upon the said shaft and rotates with the
head-block, to which it is. also connected by the lock pins N.
These lock-pins are rigidly secured in the sleeve, as shown in Fig. 12, and pass
loosely through openings g, in the head block and enter recesses h formed in the
rear face of the die-carrier.
These recesses register with the openings in the head-block when the die-carriers
are at the extreme of their central movement, or closed and in a working position
thus forming a lock to relieve the guide-bars from strain during the operation of
threading a blank.
For the purpose of operating the head, a lever O is provided and pivoted to the
casing C at as shown in Fig. 7, through which lever passes the pivotal. arm of a
yoke P.
This yoke works between suitable flanges on a loose collar Q located between
the flanges of the sleeve M, and is fulcrumed in a small recess or indentation in
the bottom of the oil well A* as shown in Fig. 7.
The free end of the lever O rests upon a rod R and is provided with laterally.
projecting luga k, against which the stops S S¹ on the rod R strike in shifting the
head from a closed to an open position, or vice versa.
In order to retain the heads in a closed position until opened by the stop S, at
the completion of the operation of threading a blank, a pin or lug O¹ is provided
on the under side of the lever which drops into a notch T¹ in the guide-plate T,
when the lever has reached the extreme of its forward movement, and locks the
head in a closed position-It is desirable to open the head very quickly to release
the work at the proper time, and in order to accomplish this and assist and
accelerate the backward movement of the lever, a spring actuated rod U is
provided, secured to the casing B, as more clearly shown in Fig. 2, and screw.
threaded on its outer end, and has a thumb screw for increasing or diminishing
the tension of the spring. The blank is held and fed into the dies by an ordinary;
chuck, supported on a carriage on the forward end of the table, which chuck is,
preferably operated by a hand-wheel -For the purpose of returning the carriage
to its first position after having been drawn forward by the feed of the blank into,
the dies the underside of the carriage is provided with a cog rack, into which gears
the pinion m on shaft n, which shaft is rotated by the hand lever o.
The carriage moves between suitable guides or ways cast on the table, and is
provided with a detachable pan to catch the chips and shavings, the bottom of said
pan being perforated for the purpose of draining the oil from the chips, which oil
Hows thence into the well A², from which it is drawn by pump D¹.
.

page_text: 1
Rigidly secured to one side of the carriage is one end of a rod R.. the free end of
which slides on a guide-plate T. This rod is provided with the adjustable stops S
and S¹; which strike against the lugs on levers 0 at each extreme position of the
carriage, and either opens. or closes the head as the case may be.
☐
."
The working face of stop S' is inclined slightly backward, in order to exert a
downward as well as forward pressure, which will tend to force the pin 0¹ into the
notch T¹ on the guide-plate T.
}
"
The guide-plate is adjustably secured to the sides of the frame or table, and its
upper surface upon which the pin O¹ rides is slightly inclined and cut away at its
forward end to form the notch T¹, into which the pin catches.
9
The guide-plate is preferably made adjustable for the purpose of adjusting it' to
the stroke of the lever O, as otherwise great difficulty would be encountered in
making such adjustment accurate, and accuracy is very essential in order that the
head may be locked in a perfectly closed position.
"
..
Between, the casing B and the cog-wheel C, on the hollow shaft D is located an
eccentric for operating the pump D', which through the medium of the pipe D²
supplies a constant feed of oil to the blank while being threaded.
1 )
In order to fully comprehend the operation of this machine, it will be observed
that Figs. 1 and 2 represent the parts in their positions, just prior to the chuck-
carriage having completed its backward movement-the head still open and the
lever in position just before being engaged by the stop S¹.
If now,the, chuck-carriage is moved to the limit of its backward movement while
the head is revolving continuously in one direction, the head will be closed during
the said movement by reason of the stop S¹ engaging the lever, and the pin on the
lever will drop into.the notch on the guide-plate, thereby locking the head closed,
and if a blank be then inserted in the chuck the machine is ready for operation,
which operation is as follows.
The chuck-carriage is moved forward by means of the hand-levers o until the
blank is engaged by the dies, after which engagement the further feed of the blank
is automatic, by reason of its being drawn forward into the dies by their cutting
operation.
As the carriage moves forward it carries with it the rod R, until just at the
moment the thread is completed, when the stop S engages the lever O lifting said
lever until the pin on its under side clears the notch, at which moment the spring
actuated rod U comes into play, causing the lever to quickly shift its position from
that shown in full lines in Fig. 3 to the position indicated by dotted lines in same
Figure, and open the head, thus releasing the threaded blank or bolt.
The operator then rotates the hand lever o in a reverse direction, for the purpose
of returning the carriage to its first position, the stop S¹ during said backward
movement having closed the head again, as before explained. The threaded bolt is
then removed and a blank inserted, when the same operation is repeated.
Machines of this character may be employed for tapping nuts, and when used
for such work, the devices shown in Figs. 9, 10, and 11 are employed.
A 'lock or set-nut B¹ is provided on the carriage, which nut impinges against the
table and securely locks the carriage in a suitable position.
The chuck blocks are then removed and two parallel bars C₁ of suitable length
are inserted and rigidly secured in their places and the outer ends of these bars
connected by a screw bolt C³.
The dies are removed from the head or die carriers, and their places supplied by
ordinary chuck blocks.
The square end of a nut tap D³, is then inserted and the head closed and locked
by the lever O.
The thread of the tap projects in between the ends of the bars C¹.
The head revolves continuously, as in the first case, and a blank nut is placed
between the bars and fits snug enough to prevent falling through.

page_text: The "pusher" Es is then placed in position behind the nut, straddling the
bars C, slots a¹ a¹ being provided in the pusher of sufficient depth to bring the
center of the opening b¹ on a line with the center of the tap.
The pusher is then moved forward by hand, carrying with it the blank nut,:
until the end of the tap enters the hole in the nut, when the thread will take hold
of the nut and feed it forward while cutting the thread.
The pusher is then moved back, another blank inserted, and the operation
repeated until the shank of the tap is filled with the threaded nuts, when the tap
is removed and the nuts slipped off the rear end.
It will be observed that by doing away with the cam-plates, which have hereto-
fore been used on heads to open and close the head, the possibility of clogging the
narrow space between the die carriers is effectually obviated, as clogging, which
soon renders the device imperfect in operation cannot possibly take place in heads
when constructed after the manner which has been herein shown and described.
It will also be observed that the action of the double inclines in the end of the
guide-bar, for opening and closing the head is always in a direct line, whereby the
friction of the inclines of the tongue and slot working upon each other is reduced.
to a minimum,
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated to
me by my foreign correspondent, I declare that what I claim is
1st The split heads, the actuating shaft therefor, and a sleeve upon said shaft,
in combination with rigid bars arranged on one side of a line through the meeting
faces of the split-head, and connecting both parts of the split-head with the collar,
substantially as described.
2nd The split-head, the actuating shaft, and a sleeve in combination with
bifurcated bars sliding upon the head, and rigidly secured to the collar, sub-
stantially as described.
3rd The actuating shaft, the split head, and the sleeve in combination with the
connecting bars provided with inclined grooves, and corresponding projections on
the head engaging said grooves, substantially as described.
4th The split-heads, the tongues removably secured thereto, in combination with
the sleeve, and the grooved bar secured to said sleeve, and provided with corre-
sponding grooves engaging the tongues on the head, substantially as described.
5th The split head, the sliding sleeve, and a connection between the sleeve and
head for actuating the latter, in combination with an independent locking device
connecting said head and sleeve, when the head is closed whereby the connection
for opening and closing the head is relieved from strain during the threading
operation substantially as described.
6th The split-head, the sleeve, the bifurcated connecting bar, and devices for
actuating the head in combination with a head-block and locking pins secured to
the sleeve passing through the head-block, and engaging and locking the head
when closed substantially as described.
7th The combination of the split-head, the inclined projection thereon, and the
sleeve, with a bar connecting the sleeve, and engaging said projection and provided
with longitudinal ribs substantially as described.
8th In a screw-threading machine, the shaft and the sleeve sliding thereon, in
combination with a yoke provided with a stem having an end bearing, and a lever
straddling, and for actuating said yoke to reciprocate the sleeve, substantially as
described.
9th The shaft, the sleeve, and the yoke, in combination with the lever straddling
the yoke, a notched plate, and a stud upon the lever for engaging the notch
thereof, substantially as described.
10th The shaft, the sleeve, and the actuating lever therefor, provided with a stud,
in combination with an adjustable notched plate for engaging the stud, and a
spring for actuating the said lever, substantially as described,
:

page_text: 11th The shaft, the sleeve, and the actuating lover therefor, provided with a
stud, in combination with an adjustable notched plate, for engaging the stud,
a spring for actuating said lever, and means for adjusting the tension of the spring
substantially as described.
12th The sleeve, the yoke; the lever, and the stud thereof, in combination with
a rod or bar, actuated by the feed-carriage; and provided with stops engaging the
lever substantially as described.
13th The sleeve; the yoke, the lever and the notched plate in combination' with
the bar, and the adjustable stops thereon, provided with reversely inclined faces
engaging the lever, and means for actuating said bar and stops substantially as
described.
14th In a screw-threading machine, a feed-carriage, an oil receptacle below the
path of the same, and a removable perforated pan on the feed carriage'substantially
as described:.
15th The feed-carriage in combination with the bar c'c, and means for adjusting
the same to clamp the nut, a nut-pusher, and a revolving split-head, and a screw
tap held by said head; substantially as described!-