Improvements in Nut-tapping Machines.
Year: 1891

page_text: Date of Application, 6th Jan., 1891-Accepted, 21st Mar., 1891
COMPLETE SPECIFICATION.
Improvements in Nut-tapping Machines.
We, CLARENCE LEE CHAPMAN, Mechanical Engineer, of 1619, Chestnut Street,
Erie, in the County of Erie, and State of Pennsylvania, HENRY ISAAC PETRIE,
Manufacturer, of 102, Gansvort Street, SIDNEY WILFORD PETRIE, Sawyer, of
544, East Main Street, JOSHUA JUDSON GILBERT, Manufacturer, of 36, Prospect
Street, and HADLEY JONES, Lawyer, of 534, East Main Street, Little Falls, in the
County of Herkimer, and State of New York, both in the United States of
America, do hereby declare the nature of this invention, and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement :-
The object of this invention is to provide a new and improved machine for cutting
the thread in punched blanks for nuts, which will be simple and durable in
construction, very effective, and entirely automatic in operation, requiring no
manual labor except filling the hopper with the blanks.
The invention consists of an automatic device for removing the nut blanks singly
from the hopper, and delivering the same regularly in proper position to the tap, of
means for automatically feeding the tap and lifting it, and of a mechanism for
automatically removing the tap from the spindle to discharge the threaded nuts.
The invention also consists of certain parts and details and combinations of the
same, as will be hereinafter fully described and then pointed out in the claims.
Reference is to be had to the accompanying drawings, forming a part of this
Specification, in which similar letters of reference indicate corresponding parts in
all the figures.
Figure 1 is a plan view of a single machine;
Figure 2 is a sectional side elevation of the same on the line x-x of Figure 1 ;
Figure 3 is a side elevation of the same;
Figure 4 is an elevation of the opposite side of the same, with parts broken out;
Figure 5 is a plan view of the clutch mechanism, with parts in section ;
Figure 6 is a sectional end view of the same on the line y-y of Figure 5;
Figure 7 is an enlarged sectional side elevation of the tap holder;
Figure 8 is a sectional plan view of the same on the line of Figure 7;
Figure 9 is an enlarged inverted plan view of the clamping device for the tap ;
Figure 10 is a face view of the cam plate for the same;
Figure 11 is an enlarged sectional plan view of the feeding device; and
Figure 12 is an enlarged sectional side elevation of the tap discharging
mechanism.
The improved nut-tapping machine is mounted on a suitably constructed frame A,
in the upper rear part of which is journaled the transversely-extending main driving
shaft B, carrying at one end a pulley B, connected with suitable machinery for
imparting a rotary motion to the said main driving shaft B. On the latter is also
secured a smaller pulley B2, over which passes a quarter-turn belt B³, also passing
over a pulley B4, secured on the vertically-arranged spindle C, mounted to turn in
suitable bearings formed in a bracket A', secured on the top of the frame A, at its
front end.
On the spindle C above the pulley B' is a loose flanged collar C', against the
under side of which presses a spring C², coiled on the spindle C and resting at its
lower end, on the web or hub of the pulley B. The latter is held in place on the
spindle by a collar C³, secured to the spindle, and on the top of which rests the
under side of the hub or web of the pulley B. The spring C² serves to exert
pressure against the pulley B, and consequently the spindle C, when the latter is

page_text: raised in an uppermost position, the collar C striking against the upper bearing on
the bracket A, and a further upward motion of the pulley B then compressing the
spring C².
On the lower end of the spindle C is held the tap holder D, carrying the tap E,
having a long shank E', on the lower end of which are formed the usual cutting
threads E2, for tapping the nuts. The shank E' is sufficiently less in diameter than
the threads E2, so that the nuts, after being tapped, can readily slide on the said
shank E. The latter is provided on its upper end with a polygonal or square offset E³,
adapted to pass into a correspondingly-shaped opening D³, formed in the lower part D²,
of the tap holder D, which latter is made of the two parts D1 and D2, of which the
part D screws on the part D' and said part D' is secured to the lower end of the
spindle C, as is plainly shown in Figures 2 and 7.
On the upper end of the square offset E3 of the tap E is formed a semi-circular
annular recess E, adapted to be engaged by pins D', held to slide radially in the
lower part D2 of the tap holder, the outer ends of the said pins being secured to
springs D, secured on the said part D² of the tap holder. The springs have a
tendency to hold the pins D in an innermost position, that is in contact with the
annular recess E4, so as to hold the tap E in place in the holder D.
The extreme upper part of the tap shank E¹ is formed with a rounded-off head E³,
as is plainly shown in Figure 7. The upper side of the lower part D² of the tap
holder D is provided with a cone-shaped recess D, which permits the head E³ of
the shank E, to be readily guided into the opening E3, when the tap is re-inserted
in the tap holder, as hereinafter more fully described.
On the spindle C, below the driving pulley B is secured a bar F1, forming part
of the lifting mechanism F, for raising the spindle C to raise the tap E, after one
nut is tapped and has slipped onto the shank E' of the said tap, the tap being then
ready to again engage the next following nut in order to tap it.
On the outer ends of the bar F1 of the lifting device F, are secured trunnions to
which are pivotally connected links F2, pivotally connected with levers F³, which
are in turn pivoted at F4 to the main frame A. On the levers F3 are held friction
rollers F, travelling on cams G, secured on a transversely-extending shaft G¹,
mounted to turn in suitable bearings in the frame A. On the shaft G is secured a
worm wheel G2, meshing into a worm G³, secured on an inclinel shaft G4, mounted
to turn in suitable bearings in the main frame A, and provided at its upper end with
a bevel gear wheel G6, meshing into a bevel pinion G, secured on the main driving
shaft B. When the latter is rotated, a rotary motion of the same speed is trans-
mitted to the spindle C by the belt B3 and the pulleys B2 and B. At the same
time, a rotary motion is transmitted to the shaft G' by the bevel gear wheels G³
and Go, the shaft G', and the worm and worm wheel G³ and G2, but in such a
manner that when the shaft B has made thirty-two revolutions the shaft G' has
made one revolution. Every time the shaft G₁ makes one revolution, its cams G
engaging the friction wheels F5 of the levers F³, cause the latter to swing upward,
so as to raise the spindle C, thereby lifting the tap E after one nut is tapped and
for the purpose of placing a new nut in place to be tapped when the spindle C again
descends, as hereinafter more fully described.
On one outer end of the shaft G¹ is secured an arm G', carrying an adjustable
finger G, adapted to engage one of the teeth H', of wheel H, which carries on its
face, a pin H2, adapted to engage an arm H³, secured on a transversely-extending
shaft I, arranged below the shaft G¹, and mounted to turn in suitable bearings in
the main frame A. On the hub H4 (Figure 5) of the arm H³ is mounted to turn
loosely, the toothed wheel H, previously mentioned, the said wheel H being turned
the distance between two teeth at every revolution of the shaft G¹ by the finger G®
held on the arm G' secured to the said shaft G'. The shaft I governs the discharging
device J, of the tap E and also the mechanism K, for disconnecting the tap from
its holder D.
On the shaft I is secured a cam wheel I', on the periphery of which is held one
arm of a bell-crank lever 12, extending horizontally and fulcrumed on the main

page_text: frame A. The other arm of the said bell-crank lever 12 is formed like a shifting
fork, and engages a clutch I³, mounted to turn with and to slide on the shaft I, and
adapted to engage a correspondingly-shaped clutch I', formed on one face of a gear
wheel I, held to rotate loosely on the shaft I.
The gear wheel I' is in mesh with a large gear wheel I, secured on the shaft G',
the said gear wheel I being about four times as large as the gear wheel I'. A spring I7,
is coiled on the shaft I between the hub of the cam I' and the smooth end of the
clutch I³, the said spring 17 serving to quickly force the clutch I³ in mesh with the
clutch I, when the bell-crank lever 12 is free to shift, that is when its arm passes
suddenly over the back of the cam I¹.
On the rear outer end of the shaft I is secured a cam wheel L, for operating the
discharging device J and the mechanism K for disengaging the tap from the
holder D. For the first purpose, the cam wheel L is provided on its outer face with
a pin L, adapted to engage an arm J', extending from a lever J2, fulcrumed at .J3
on the outside of the main frame A. From the lever J2 projects forward a
segmental gear wheel J, meshing into a gear wheel J³, secured on one end of a
transversely-extending shaft J, mounted to turn in suitable bearings arranged on the
outside of the lubricating box N, secured to the under side of the bed plate of the
main frame A, as is plainly shown in Figures 1 and 4.
On the shaft J is secured a segmental arm O, adapted to pass over the slightly
On the outer end of
outwardly-curved end of the front of the lubricating box N.
this segmental arm O is secured a horizontally-extending part O', on the top of
which is held the nut holder 02, provided with an opening O³, covered by a trans-
verse bar O, and through which passes the nut to be tapped by the tap E. The
nut holder O is arranged to contain two nuts at a time, one being under the bar O¹,
and the other one alongside of it at the inner end of the holder, and directly under
the tap E. The holder O2 is made removable from the segmental arm O, so as to
change it according to the size of the nuts to be tapped. When the segmental
arm is in the position shown in Figure 2, the inner nut abuts against the end of the
nut holder and also on the sides of the same, so that its punched aperture will be in
line with the tap E. Directly under this nut to be tapped are arranged openings
in the bottom of the nut holder 02 and also in the part O', for the free passage of
the threaded end E2 of the tap E.
On the under side of the plate O' is arranged a clamping device P, adapted to
engage the threaded end E2 of the tap E whenever the latter is to be disengaged
at its upper end from the holder D, and as is plainly illustrated in Figure 12.
This clamping device P is provided with a bolt P, on which are pivoted two
jaws P2 and P3, having segmental openings arranged opposite each other to con-
form to the diameter of the blade end E2 of the tap E, as is plainly shown in
Figure 9.
The two jaws P2 and P3 are pressed toward each other by springs P4, secured to
the under side of the plate O¹, and the said two jaws P2 and P3 are held apart as
long as the segmental arm O is in the position shown in Figure 2, by their inner
ends P engaging the inclined edge of arins N2, formed on a fixed plate N³, secured
to the inside of the front of the lubricating box N. The downward motion of the
tap E is limited by the fixed plate N4, extending horizontally in the lubricating
box N, as illustrated in Figure 2. The two jaws P2 and P3 are spread apart at
their segmental openings, but their rear ends 15 engage the beveled arms N of the
fixed plate N³, that is, when the segmental arm is in the position shown in
Figure 2 and the tap is ready to tap the nuts.
When the segmental arm swings to remove the plate O' from the lubricating
box N, as hereinafter more fully described, then the rear ends P³ of the said
jaws 12, 13 are disengaged from the beveled arms N² of the fixed plate N³, so that
the springs P pressing on the said jaws, close the same, so that they engage the
blade end E2 of the tap E, and hold the same in position. The outer end of the
opening O³ of the nut holder is adapted to register, when the segmental arm is
in the position shown in Figure 2, with a channel 06, arranged on the top of the

page_text: lubricating box N, the outer end of said channel being connected with the inclined
chute Q, of the nut-feeding device Q.
Under the channel O and secured to the under side of the top of the lubricating
box N, is arranged a spring 07, formed at its free end with an upwardly-extending
lug 08, engaged by the under side of the plate O when the segmental arm O is in
the position shown in Figure 2, so that the spring O' is bent downward. The
moment the segmental arm 0 swings upward and carries the plate O' with it, then
the compressed spring O' springs upward and its lug 08, passes in front of the
channel O, so as to prevent the nuts from passing out of the said channel into the
lubricating box N. When the plate O' swings back again, it again presses out the
lug (6 of the spring O' to disengage the same from the opening of the channel 06,
so that the nuts can again pass from the channel to the nut holder O².
The gear wheel J³, is not secured rigidly on the shaft J. but is held loosely
thereon, and is connected with one end of a coiled spring J', connected at its other
end to a collar Js, secured on one outer end of the shaft J, so that in case of
accident, the gear wheel J can be rotated by the segment J without turning the
shaft J, but compressing the spring J, it being understood that this would only
take place in case the segmental arm O is locked in place by the tap E, as shown
in Figure 2. A spring J is coiled on the said shaft J6 and serves to insure the
return movement of the shaft J after the nuts are discharged from the shank E'
of the tap E, as hereinafter more fully described.
In the periphery of the cam wheel L is formed a recess L³, and on the said
periphery is held to travel, a friction roller K', journaled in one end of a short
arm K² secured on one end of a transversely-extending shaft K³, mounted to turn
in suitable bearings in the main frame A. On the shaft K2 is secured a forwardly-
extending lever K provided at its outer end with a ring K' concentric with the
spindle C. On this ring K' is held to travel a friction roller K, journaled on one
end of a lever K', fulcrumed on the upper part D' of the tap holder D, and pro-
jecting with its inner end through a recess in the said part D', the inner end being
provided with an offset K adapted to engage a slot D' formed in a plunger D8 held
to slide vertically in the part D' of the holder D. From this plunger D extends
downward a pin D3 adapted to pass on to the head E' of the tap E, and serving to
disengage the latter from the pins D' and press it out of the holder D2, as herein-
after more fully described, preparatory to depositing the nuts which have
accumulated on the shank E' of the tap E.
The chute Q previously mentioned is provided on its upper end with a twist Q²
and is supported at its upper end on a lever ', fulcrumed loosely on a shaft S
mounted to turn in suitable bearings in the main frame A, and arranged trans-
versely below the main driving shaft B. On said shaft S is secured a pulley S¹
over which passes a belt S2, also passing over a pulley S3 secured on the shaft G¹,
which as previously described, is rotated from the main shaft B.
The rotary motion of the shaft G' is transmitted by the pulley S3, the belt S²
and the pulley S' to the shaft S. On the latter is secured a wheel T having a
shoulder T cut in its periphery, the said shoulder serving to take up one of the
nuts from an inclined hopper U, in the lower, narrow end of which fits part of the
said wheel T, so that at every revolution of the wheel T its shoulder T' takes up
one of the nuts in the hopper and carries and deposits it on to an inclined flange Q
formed on a narrow chute Q, inclined as shown in Figure 2, and secured to the
lever Q, and opening at its lower end into the upper end Q of the chute Q. The
lever Qis provided on its outer end with a curved projection Q adapted to be
engaged by a toothed wheel Q8 secured on the shaft Gand turning with the latter.
The toothed wheel, in passing over the projection Q3, imparts a swinging motion
to the lever Q, so that the chute Q', is vibrated, and a similar motion is imparted
to the chute Q', resting at its lower end on the top of the lubricating box N at the
end of the channel O, as previously described.
A nut taken up by the shoulder T₁ falls flat on to the flange Q, and from the
latter, by the vibratory motion of the chute Q, into the narrow channel of the

page_text: latter in an upright position, as shown in Figure 2. The nuts are successively
delivered into the upper end Q2 of the chute Q, which upper end, on account of
its twist, turns the nut until it lies flat and slides down the said chute Q', into the
channel O, and from the latter into the holder O2 when the said holder registers
with the said channel 0, as previously described.
The operation is as follows :-
1
When the main driving shaft B is rotated, the several mechanisms are set in
motion in the manner presently to be described. When the machine starts, the
cams G on the shaft Gacting on the friction rollers F³, raise the levers F3, which,
by being connected with the spindle C, raise the latter, so that the tap E moves
upward with the spindle, and its lower threaded end E is above the holder 02,
which latter is then free to receive two nuts pressed into the holder from the series
of nuts contained in the chute Q¹. The innermost nut is then in the proper
position to be acted on by the threaded end E2 of the tap, and as soon as the
cams G have disengaged the friction rollers F³, the previously compressed spring C²
presses the spindle C downward and forces the lower threaded end E2 of the tap E
into the punched aperture of the respective nut, so that as the spindle C has a
constant rotary motion the threaded end taps the nut in the usual manner, and the
mut after having passed the threaded end, remains on the shank E' of the tap.
When this takes place the cams G again engage the friction rollers F' to raise
the spindle C, which latter and its tap E are moved upward carrying the threaded
end along.
When the spindle is in its uppermost position, a new nut is pushed into place on
the holder O, and when the spindle again descends the second nut is threaded in
the manner above described. This motion is continued until fifteen nuts have
accumulated on the shank E¹ of the tap E. Now, at every revolution of the shaft G¹
the finger G moves the toothed wheel H the distance between two teeth, and as
the wheel H is provided with fifteen teeth, its pin H2 engages the arm H³ and
carries the latter with it, so as to turn the shaft I. At the end of the fiteenth
revolution of the shaft G¹ the shaft I has made one revolution, and at the same
time the bell crank lever 12 drops off of the back of the cain I, see Figures 6 and 5,
so that the spring 17 pressing on the clutch 13 throws the latter into mesh with the
clutch I, and as said clutch is constantly rotated from the large gear wheel I
and the gear wheel I³, a rapid rotary motion is imparted to the shaft I by the said
gear wheels 16 and 15.
At the time when the cams G lift the spindle C the sixteenth time, as previously
described, the cam wheel L on the shaft I is in such a position that the friction
wheel K' travels up the incline L2 of the said wheel L, whereby the lever K* by
its ring K acting on the lever K7, swings the outer end of the same upward and
the inner end K downward, so as to press or hold the plunger D in position,
while the spindle C with its holder D slides upward vertically.
The pin D now presses on the head E5 of the tap E, so as to force the pin D
outward, which thus disengage from the annular recess E, whereby the shank E'
is unlocked from the lower part D2 of the holder D, and the square end E³ of the
shank slides out of the opening D³ as the spindle C moves into its uppermost
position. At this time the wheel L moves its pin L' into contact with the lever J2,
so that the latter is turned until the pin L' slips over the segmental arm J', as the
said lever Joscillates from the pivot J³, which is located a suitable distance
below the shaft I carrying the cam wheel L, the oscillation carries the lever out of
the circular path of the pin L'.
The movement of the lever J2 forces its segmental arm J upward, so that the
gear wheel J is turned, and by the connection of the latter with the spring J7, the
collar J and the shaft J, the latter is given a half-turn, whereby the segment
arm swings onward carrying with it the tap E, which is freed at its upper end
from the holder D, as previously described. As soon as the arm commences to
swing outward, the jaws P2 and P3, close by the action of the springs P, and on

page_text: When the
account of being disengaged from the beveled lugs N2 of the fixed plate N³. The
jaws P2 and P3, in closing, clamp the threaded end E2 of the tap E, so as to hold
the latter in place on the plate O' attached to the segmental arm O.
shaft turns into the position shown, in Figure 12, the shank E' of the tap E
extends downward, so that the nuts which had been held above the thread E of
the shank E', now slide off the latter upon the ground or into a suitable receptacle
located below the machine under the shaft J6. As soon as this has taken place the
spring J causes a return movement of the shaft J at the time when the pin L' has
left the arm J of the lever J2, so that the shaft J with the said lever J³, returns
to its former position, the tap E being free from all the tapped nuts.
As soon as the tap again moves into its vertical position, as shown in Figure 2,
the jaws P2 and P3 again engage the shoulders N2 of the fixed plate N³ and are
thereby opened to release the tap E, and at the same time the upper end of the
shank E of the said tap is engaged by the downwardly-sliding holder D, the conical
end D of which guides the head E' into the opening D³, the head finally passing
over the spring-pressed pins D, which latter again snap into the annular recess E
so as to lock the tap again to the holder D, as previously described. The next
upward movement of the spindles C carries the tap along, a nut is again pushed
into the holder 0%, which now again registers with the channel 0° in the manner
above described, and the previously-described operation is repeated.
When the shaft I is given one quick revolution by the gear wheel Iº, at the time
the clutches I and I are in mesh and the revolution is almost completed, then the
bell-crank lever 12 by travelling up the steep inclined part of the cam I see
Figure 6, commences to move the clutch I³ out of contact with the clutch I, but
the movement of the lever I will barely disengage the clutch teeth without leaving
any clearance between the teeth. The additional movement for the shaft I is,
however, furnished by the weight of the arm K2 and the lever K, which at this
time press the friction roller K on to one side of the recess L² in the cam wheel L,
thus turning the shaft sufficiently to move the bell-crank lever to the highest point
of its cam I', thereby completely separating the two clutches 13 and 14, and giving
plenty of clearance for the same while not in mesh.
The friction roller K' always stands in the lowest point of the recess L² of the
cam wheel L when the latter is not turned by the shaft 1. When the friction
roller K stands in its lowermost position, the lever K also hangs downward and its
ring K' does not affect the lever K' and the plunger D8, when the spindle rises
and falls, as above described, to tap the respective number of nuts for which the
machine is constructed, at every full revolution of the toothed wheel H. When
the roller K' stands in the lowest point of the recess L² of the cam wheel L, then
the pin L' stands in its lowermost position and when the cam wheel L turns with the
shaft I, the said roller in travelling up the steep side of the recess L², actuates
the device for disengaging the tap from the holder D, before the pin L' acts on the
lever J to turn the shaft J, so that the tap is free from the holder D before the
segmental arm O swings the tap to dump the tapped nuts, as above mentioned. It
will be seen that should a blank nut with an opening too small for the size of the
tap E, used, or a nut not punched at all, come into the nut holder O2 under the
tap, then the spindle C carrying the tap, when it meets such a nut, will simply
be held in a raised position with the lower end of the tap turning on top of the
faulty nut.
The other parts of the machine keep up their functions however, but when the
shaft J is to be turned by the segmental gear wheel J* turning the gear_wheel J,
the latter makes its half revolution, but only compresses the spring J' without
turning the shaft J. The faulty nut can be easily removed at any time by the
operator in charge of the machine.
In case an unpunched nut is in the holder under the tap E, then the nut feed
wheel T still delivers at each of its revolutions a nut to the chute Q', but as the
chute Q2 is filled with nuts, the additional nuts passing down the chute Q', fall

page_text: over the upper end of the chute Q to the ground. This also takes place when the
wheel T feeds the nuts faster, as they are taken and threaded in the manner above
described.
It is understood that a series of machines may be placed one alongside the other
on the same frame to be driven from the main driving shaft B, it then not being
necessary to provide a separate shaft I and clutch mechanism for each machine, as
one will be sufficient to impart the necessary movement to a shaft J which will be
common to the discharging mechanism of each machine. The several spindles C
will then be connected with each other by a continuous bar instead of the trunnioned
bar F, the said bar being connected at its ends with the links of the single
lifting mechanism, as shown and described.
The shaft K will then carry a lever K for each spindle, to disengage the tap
from the respective spindle. The several movements of the series of machines will
then be simultaneous. For different sized nuts correspondingly-sized taps and
feeding chutes must necessarily be employed.
For nuts of a size larger then inch, the spindle C is driven by gear wheels,
instead of the belt B³ and pulley connections, as such nuts require more power for
threading.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. In a nut-tapping machine, the combination, with an inclined chute having the
space between its side walls at its inner open end contracted, of a rotary wheel, the
inner portion of which enters said contracted space, said wheel having a toothless
periphery provided with a notch forming a single radial shoulder, to pick up one
nut at a time and carry it outside of the hopper, substantially as shown and
described.
2. In a nut-tapping machine, a nut feeding device comprising a wheel having a
shoulder adapted to pick up and carry a nut, and a vibrating inclined chute having
flanges upon which the shoulder of the said wheel discharges, substantially as shown
and described.
a
3. In a nut-tapping machine, a nut feeding device comprising a wheel having
shoulder adapted to pick up and carry a nut, a vibrating inclined chute having
flanges upon which the shoulder of the said wheel discharges, and a second chute
having a twisted upper end and into which said first chute discharges, substantially
as shown and described.
4. In a nut-tapping machine, a spindle having a tap holder adapted to support
the tap, and a plunger within said holder to engage the upper end of the tap and
push it out of the holder, substantially as shown and described.
5. In a nut-tapping machine, a spindle having a tap holder adapted to support
the tap, the spindle being held to slide vertically, in combination with a plunger for
automatically disconnecting the tap when the said spindle moves upward, substan-
tially as shown and described.
6. In a nut-tapping machine, a tap holder having a polygonal recess for the
reception of the polygonal end of the tap, a plunger in the holder above said recess,
a lever for actuating the plunger, and spring-pressed pins held to slide in the
holder and adapted to lock the tap in place in the holder, substantially as shown
and described.
7. In a nut-tapping machine, the combination, with a tap having a polygonal end
formed with an annular semi-circular recess, of a tap holder having a polygonal
recess for the reception of the polygonal end of the tap, spring-pressed pins held to
slide in said holder and adapted to lock the tap in place in the holder, and a plunger
having longitudinal movement in the holder, to engage the upper end of the tap and
push its recessed end past said pins, substantially as shown and described.
8. In a nut-tapping machine, the combination, with a tap having a polygonal end

page_text: formed with an annular recess, of a tap holder having a polygonal recess for the
reception of the polygonal end of the tap, spring-pressed pins held to slide in the
said holder and adapted to lock the tap in place in the said holder, and a plunger
held to slide in the said tap holder to disconnect the said tap and holder, substan-
tially as shown and described.
9. In a nut tapping machine, the combination, with a swinging arm, of a nut
holder and a clamp to grasp the tap when the arm and attached holder and clamp
are swung outward, substantially as shown and described.
10. In a nut-tapping machine, the combination, with a swinging arm, of a nut
holder thereon, a normally open, tap-grasping clamp adjacent thereto and closing on
the tap when the arm is swung outward, and a clamp opener or releaser in the path
of the clamp when the arm and its attached holder and clamp are swung inward,
substantially as set forth.
11. In a nut-tapping machine, the combination, with a lubricant tank or receiver,
of an arm mounted to swing into and out of the tank or receiver, and provided with
a nut holder on its end within the tank or receiver, substantially as set forth.
12. In a mut-tapping machine, the combination, with a shaft mounted to turn, of
an arm secured on said shaft, a tap grasping clamp or gripper held on said arm to
hold the tap in place on the arm, and a releaser operating in conjunction with the
clamp, and serving to open the same, as set forth.
13. In a nut-tapping machine, the combination, with a nut holder mounted to
swing and having an end opening, of a fixed channel adapted to register with the
said end opening, and an inclined vibrating chute discharging into the said fixed
channel, substantially as shown and described.
14. In a nut-tapping machine, the combination, with a nut holder mounted to
swing and having an end opening, of a fixed channel adapted to register with said
end opening, and a fixed spring adapted to be engaged by said nut holder and
serving to close the end opening of the said channel, substantially as shown and
described.
15. In a nut tapping machine, the combination, with a nut holder, of a plate
supporting said mut holder, spring-pressed jaws pivoted on said plate, and a fixed
plate having beveled arms adapted to be engaged by said jaws to open the latter,
substantially as shown and described.
16. In a nut-tapping machine, the combination, with a spindle mounted to rotate
and to slide vertically, of a tap holder held on said spindle and adapted to support
the tap, a rocking lever for imparting an upward sliding motion to the spindle, and
a plunger for disconnecting the tap and its holder when the spindle is on one of its
upward movements, substantially as described.
17. In a nut-tapping machine, the combination, with a lever mounted to swing
and provided with a ring, of a tap holder passing centrally through said ring and
adapted to support the tap, and a second lever fulcrumed on said tap holder and
adapted to travel with one end on the ring, and a plunger held to slide in said
holder and operated by said second lever to remove the tap from the holder, sub-
stantially as shown and described.
18. In a nut-tapping machine, the combination, with a lever mounted to swing
and provided with a ring, of a tap holder passing centrally through said ring and
adapted to support the tap, a second lever fulcrumed on said tap holder and adapted
to travel with one end on said ring, a plunger held to slide in said holder and
operated by the said second lever to remove the tap from the holder, and cams for
actuating the said lever and holder to move both simultaneously upward, substan-
tantially as shown and described.
19. In a mut-tapping machine, the combination, with a lever mounted to swing
and provided with a ring, of a tap holder passing centrally through said ring and
adapted to support the tap, a second lever fulcrumed on said tap holder and adapted
to travel with one end on said ring, a plunger held to slide in said holder and
operated by said second lever to remove the tap from the holder, cams for actuating

page_text: said lever and holder to move both simultaneously upward, and a spindle having a
rotary and a sliding motion and carrying said holder, substantially as shown and
described.
20. In a nut-tapping machine, the combination, with a spindle mounted to turn
and to slide, of a lever connected with said spindle to raise the same, and a cam
operating on said lever to operate the same, substantially as shown and described.
21. In a nut-tapping machine, the combination, with a spindle mounted to turn
and to slide, of a lever connected with said spindle to raise the same, a cam operating
on said lever to raise the same, and a spring pressing on said spindle to move the
same downward, substantially as shown and described.
22. In a nut-tapping machine, the combination, with a spindle mounted to turn
and to slide, of a lever connected with the said spindle to raise the same, a cam
operating on said lever to raise the same, a finger held in said cam, a toothed wheel
actuated by said finger and carrying a pin, and a shaft carrying an arm adapted to
be engaged by said pin to turn said shaft, substantially as shown and described.
23. In a nut-tapping machine, the combination, with a spindle mounted to turn
and to slide, of a lever connected with said spindle to raise the same, a cam
operating on the said lever to raise the same, a finger held in said cam, a toothed
wheel actuated by said finger, and carrying a pin, a shaft carrying an arm adapted
to be engaged by said pin to turn said shaft, à cam held on said shaft, and a lever
actuated by said cam for detaching the tap from the spindle, substantially as shown
and described.
24. In a nut-tapping machine, the combination, with a spindle mounted to turn
and to slide, of a lever connected with the spindle to raise the same, a cam operating
on the lever to raise the same, a finger held in the cam, a toothed wheel actuated
by the finger and carrying a pin, a shaft carrying an arm adapted to be engaged by
the pin to turn said shaft, a cam held on said shaft, a lever actuated by the cam for
detaching the tap from the spindle, and a detaching device connected with the
holder of the spindle and actuated from said lever, substantially as shown and
described.
25. In a nut-tapping machine, the combination, with a shaft having a slow turning
movement, of a cam held on the shaft, a shifting lever actuated by the cam, a clutch
held to slide on and to turn with the shaft and connected with the shifting lever,
and a gear wheel having a constant rotary motion, mounted loosely on the shaft
and provided with a clutch adapted to be engaged by the first named clutch,
substantially as shown and described.
26. In a nut-tapping machine, the combination, with a shaft having a slow
turning movement, of a cam held on the shaft, a shifting lever actuated by the cam,
a clutch held to slide on and to turn with the shaft and connected with the shifting
lever, a gear wheel having a constant rotary motion, mounted loosely on said shaft,
and provided with a clutch adapted to be engaged by said first named clutch, and a
spring pressing on the first named clutch to force the latter suddenly in contact
with the gear wheel clutch, substantially as shown and described.
27. In a nut-tapping machine, the combination, with a shaft having an inter-
mittent fast and slow rotary motion, of a cam wheel secured on the shaft and
provided with a pin and a recess in its periphery, a lever adapted to be engaged by
the pin and provided with a segmental gear wheel, a gear wheel in mesh with the
segmental gear wheel, a second shaft on which said gear wheel is mounted loosely,
and a spring coiled on said shaft and secured at one end to the gear wheel, and at
its other end connected with said shaft, as set forth.
28. In a nut-tapping machine, the combination, with a shaft having an inter-
mittent fast and slow rotary motion, of a cam wheel secured on said shaft, and
provided with a pin and a recess in its periphery, a lever adapted to be engaged by
said pin and provided with a segmental gear wheel, a gear wheel in mesh with said
segmental gear wheel, a second shaft on which said gear wheel is mounted loosely,
a spring coiled on said shaft and secured at one end to the gear wheel and at its
12

page_text: other end connected with the shaft, and a segmental arm secured on the shaft and
carrying the nut holder, substantially as shown and described.
29. In a nut tapping machine, the combination, with a shaft having an inter-
mittent fast and slow rotary motion, of a cam wheel secured on said shaft and
provided with a pin and a recess in its periphery, a lever adapted to be engaged by
said pin and provided with a segmental gear wheel, a gear wheel in mesh with said
segmental gear wheel, a second shaft on which said gear wheel is mounted loosely,
a spring coiled on said shaft and secured at one end to said gear wheel and at its
other end connected with said shaft, a segment arm secured on said shaft and
carrying the nut holder, and a tap clamping device held on said segmental arm
and adapted to support the tap, substantially as shown and described.
30. In a nut-tapping machine, the combination, with a shaft having an inter-
mittent fast and slow rotary motion, of a cam wheel secured on said shaft and
provided with a pin and a recess in its periphery, a lever adapted to be engaged by
said pin and provided with a segmental gear wheel, a gear wheel in mesh with the
said segmental gear wheel, a second shaft on which said gear wheel is mounted
loosely, a spring coiled on said shaft and secured at one end to said gear wheel and
at its other end connected with said shaft, a segmental arm secured on said shaft
and carrying the nut holder, a tap clamping device held on said segmental arm and
adapted to support the tap, and a fixed plate for opening said clamping device,
substantially as shown and described.
Dated this Oth day of January 1091.
aven IIS OU uay 01. »anuary 1891.
C. L. CHAPMAN.
H. I. PETRIE.
S. W. PETRIE.
J. J. GILBERT.
H. JONES.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.