Year: 1898

page_text: Date of Application, 12th Apr., 1898-Accepted, 23rd July. 1898
supporting the cap.
In the accompanying drawings-
Figure 1 is a plan view of my machine.
Figure 2 is a front elevation of the same.
Figure 3 is a side elevation of the left hand end of said machine.
Figure 4 is an enlarged sectional view partly in elevation, of a portion of my
machine, the plane of section being vertical and in alignment with the axis of
the tap.
Figure 5 is a sectional elevation of portions of my machine on the line - of
Fig. 2, said figure being on the same scale as Figs. 1, and 3.
Figure 6 is a horizontal section of parts of my machine on the line y-y
Fig. 5, and
of
Figure 7 is a sectional side elevation, showing the lever and cam for operating
the nut clamp or holder.
The driving shaft A Fig. 1, is provided with fast and loose pulleys 8 and 9 upon
which to run the driving belt. Said shaft carries a pinion 10 that engages a gear
wheel 11, the said wheel carrying a pinion 12 that engages and drives the gear
wheel 13 of the cam shaft 14. The driving shaft A also carries a gear wheel 15
that engages and drives the pinion 16 on the spindle 17 that carries the tap 18.
The said spindle 17 is mounted to slide longitudinally as well as to revolve and in
so sliding the teeth of the gear and pinion 15 and 16 may slip lengthwise on each
other. A swinging lever 19 is pivoted to the frame of the machine and its forked
upper end is connected with a collar 20 on the end of the spindle 17. Said lever
is moved in one direction by means of a weight 21 connected with said lever by
a cord 22 that passes over a pulley 23. The said lever 19 is also provided with a
short arm carrying a roller 24 that is engaged by a cam 25 on the cam shaft 14
to move said lever in the direction to lift the said weight. The forward incline
of the cam 25 is followed by a straight face so that the lever does not move in either
direction when said straight face of the cam and the said roller are in engagement
with each other. Said straight face is followed by a let off incline to permit the
weight to move the lever.
Upon the chuck or tap holder 27 of the tapping spindle there is a sliding
frame 26, which is free to slide a given distance and limited in said sliding move-
ment by its heads and the ends of the head or tapping chuck 27.
It is shown in
Figs. 1 and 2 as at one end of its stroke and is therefore free to slide towards the
right until its left hand end is in contact with the left hand end of the chuck 27.
P 971

page_text: Upon the frame of the machine or other fixed support, a trip lever 28 is pivoted
as at 29 with one end in the range of the sliding frame 26 but just out of reach of
said frame when at the limit of its movement to the left on the spindle, as shown,
but close enough to be in the path of-said frame when said frame is shifted to the
right relatively to the spindle.
A shipper lever 30 is fixed on the rock shaft 31. On the other end of said rock
shaft is an arm 30" that is provided with a roller 32. The frame of the machine
is also provided with a roller bracket 33 and roller 34 on one side of the rock shaft
arm 30 and with a roller bracket 35 and roller 36 on the other side of said arm.
Underneath the outer end of the trip lever there is a fixed bracket hook 37. A
release cord 40 has attached to one end an eye or ring 41 which is slipped loosely
upon the bracket hook, said cord passing under the roller 32 around the roller 34
on the left hand roller bracket 33 to the lower end of the rock shaft arm 30" to
which the opposite end of the cord 40 is secured. Another cord 39 has one end
secured to the lower end of the rock shaft arm, passes over the roller 36 of the
right hand roller bracket 35 and has its other end secured to the weight 38. The
cord 40 is of such length that when arranged as shown the shipper lever is held
with its upper end in position to keep the driving belt (not shown), on the fast
pulley 8 and the weight 38 merely acts to keep the cords taut, so long as the eye 41
remains on the bracket hook 37.
At the end of the machine that is opposite from the tapping spindle &c., is the
work holding frame or vertical bed 42, in the center of which is a perforated nut
rest or block 43 of hardened steel, see Figs. 4 and 6. In alignment with the
tapping spindle and hole through the nut rest, there is a follower support or
guide 44 and sliding follower 45. The end of the tap 18 is pointed and the end
of the follower has a female, center to fit the said point as shown in Fig. 4. The
follower is so fitted that it may be, and is, at times extended so as to project its
end beyond the face of the nut rest. Above and below the nut rest I place the
fixed holding jaws 46, preferably made vertically adjustable, which jaws I provide
with extensions 47 with their confronting faces near their outer ends beveled off
on parallel inclines as at 48, Figs. 2 and 5. In front of the nut rest and holding
jaws is the nut stop 49. Back of the nut rest is the nut conveyer 50 and conveyer
slide 51 and on the side of the conveyer that faces the tapping spindle is the nut
holder or clamp 52, the front end of which clamp is slotted so that it can straddle
the tap. The said conveyer and clamp are pivoted on the conveyer slide as at 53
so as to swing slightly to and from the nut rest longitudinally of the tap, in
addition to sliding back and forth from front to rear with the conveyer slide. The
said conveyer slide is reciprocated by the conveyer lever and cam 55 on the cam
shaft 14. The said lever 54 is pivoted to a bracket 56 on the bolt or pivot 57 and
is connected with the conveyer slide by means of a link 58. Said lever is provided
on the upper side of its pivot 57 with an arm 59 which engages the edge of a side
projection on the cam 55, (the contour of said projection behind the cam is indi-
cated by broken lines in Fig. 5, and is partially shown in full lines in Fig. 3),
while the arm 60 on the lower side of the pivot 57 engages the edge of said cam.
In Fig. 5 the cam is shown as pressing back the upper arm 59 while the lower
arm 60 is sliding down into the depression of the cam to permit the upper end of
the lever to be thus thrown back. The parts in this view are at the middle of
their rearward stroke. When the incline at the other end of the depression in
the edge of the cam 55 engages the lower arm 60 of the conveyer lever 54, the
said lever and conveyer will be forced forward.
To the left of the conveyer slide a presser lever 62 is pivoted in suitable supports
on the bolt or axle 61. The upper end of said lever is made wide and provided
with a slot or ways 63. Within these ways is one end of the tie 64 the other end
of which tie is secured to the conveyer in such manner that the tie is carried bodily
with the conveyer in the longitudinal movement of said conveyer, the ways 63
permitting the tie to so move. The lower end of the presser lever is provided
with a bracket or ledge 65 for confining a spring 71 between it and the leg 66

page_text: of the machine so that said spring shall always have a tendency to throw the upper
eud of the presser lever to the right. The lower end of the presser lever has pivoted
thereon at 67 a sub lever 68, the upper end of which is yieldingly connected with
the presser lever by a strong spring 69. The lower end of the sub lever is acted
upon by a cam 70 on the cam shaft 14 to move the sub lever and lower end of the
presser lever to the right while the spring 71 forces that end of said lever and
sub lever to the left in opposition to said cam.
The sliding follower 45 for the tap 18 is connected by its outer end through a
link to the follower lever 72 which is fixed on the rock shaft 73. A cord or
chain 74 is secured by one end to said lever, extends over the pulley 75 and has
a weight 76 secured to its other end, said weight having a tendency to always
force the follower towards the tap. In order however to insure a positive move-
ment of the follower at every revolution of the cam shaft 14, I provide the cam 77
which acting on the arm 83 of the follower lever 74 will press the follower posi-
tively forward and to such an extent as to project its end beyond the face of the
nut rest. As soon as the highest point of the cam 77 passes the arm 83 the con-
fronting cam 78 acts on said arm to withdraw the projecting end of the follower
to a point about flush with the face of the nut rest as shown in Fig. 4, in which
position the cams hold the follower for a short time and then release it so as to
be held only by the weight and hence free to be pushed back by the tap.
It is preferable to have the throw of the conveyer lever 54 adjustable and there-
fore I pivot the upper arm 59 thereof on the pivot 79 and regulate its swinging
movement on said pivot by means of the set screw 80 see Fig. 3.
The lower arm
adjust longitudinally by means of its slot and bolt connection 8.1 and the set
screw 82.
The fixed holding jaws are also adjustable by means of an ordinary
slot and bolt connection and set screws all of which are too well known to require
detailed description. Other parts are or may be adjustable in any ordinary manner
and I have not deemed it necessary to specifically refer to their adjustability.
With the parts properly adjusted and the cams properly timed, the nut holder
or clamp will be free from pressure at a time when it and the conveyer are drawn
to the rear so that a nut may be dropped in between the nut holder and confronting
face of the frame 42 and in front of the conveyer 50. The nuts may be fed from
any ordinary hopper or chute not shown, or they may be fed in by hand. The
tap spindle will also be moved to the right so that the tap is out of the way of the
nut and conveyer. The conveyer slide and connected parts are then moved forward
by the cam and lever before described to carry the nut into position on the nut
rest 43 and the tapping spindle is moved longitudinally to present the tap to the
nut. The presser lever 62 is about this time acted on by the cam 70 and inter-
posed spring 69 to draw the nut holder or clamp towards the nut and hold it
squarely on the nut rest. If the nut is thick enough to prevent the lever 62 from
making a full stroke the said lever will stop and the sub lever 68 will swing on
its pivot 67 a little, compressing the spring 69 substantially as shown in Fig. 7,
so that the nut will be pressed against the nut rest with all the force of the
spring 69. In other words the lever 62 and sub lever 68 are moved bodily together
by the cam, as if in one piece when there is but little or no resistance to their
movement but when the movement of the lever 62 is obstructed, as for example
by a nut, then the spring yields, and the further action of the cam, if any, only
moves the sub lever and holds the presser lever to its work. As the tap enters
the nut its end enters the female center in the end of the follower so as to center
and support the tap. The holding jaws 46 act as means to prevent the nut from
rotating with the tap. The said jaws and conveyer, as shown, are adapted for
hexagonal nuts, and the nuts are fed in with their upper and lower edges in a
horizontal position, or in other words with their shorter diameter extending verti-
cally. The continued longitudinal movement of the tap and tapping spindle presses
the follower back, the weight 76 permitting the said follower to yield and at the
same time said weight holds the said follower to its work. The weight 21 must
be heavy enough to move the tapping spindle, tap, follower, and weight 76, at the

page_text: start and until the tap has well entered the nut, after which the thread of the tap
will draw the tap and spindle along and the weight 21 may, if desired, come to
a rest and slacken its cord as illustrated in Fig. 2. When the tap has completed
or nearly completed the work of threading the nut the nut holder is released and
with the conveyer it is moved to the rear ready to receive another nut.
The cam 25
acts to with draw the tap spindle and tap, lifting the weight 21 as said spindle
moves to the right. The weight 76 will press the follower in the same direction
and its action is supplemented by the cam which as before described projects the
end of the follower beyond the face of the nut rest so that if the tap breaks off in
the nut or the like, the nut with the broken tap in it will be projected so far as to
fall from the machine and out of the way of the succeeding nut. When the tap
withdraws the nut is still on it and the extensions 47 of the jaws still act to keep
the nut from rotating so that the tapping if not completed may be finished while
the tap is being withdrawn. After the threading of the nut is completed the nut
slides upon the shank thereof which is turned down below the bottom of the threads
in an ordinary manner so that the nuts may slide loosely on said shank. Another
nut is placed in front of the conveyer and back of the clamp or nut holder and
the operation before described repeated. When the nuts work back of the threads
on the tap and outside of the jaw extensions 47 they often turn a partial revolution
so that their longer diameter is vertical instead of horizontal as before. In that
case when the nuts so turned present themselves again to the jaw extensions 47
with the forward movement of the tap, they engage the beveled corners 48 of said
extension and in riding over said beveled corners are turned a partial revolution
to bring their top and bottom edges again horizontal. In the regular longitudinal
stroke of the tapping spindle the end of the sliding frame will not actuate the
trip lever, but when the shank of the tap becomes so loaded with nuts as to hold
the sliding frame to the right on the chuck the said frame is pressed against said
trip lever with force enough to move said lever and, knock the eye 41 off from
the bracket hook 37, whereby the shipper lever 30 is released to the action of the
weight 38 to shift the driving belt on to the loose pulley 9 and stop the machine.
The attendant then removes the tap, unloads it, replaces it in the machine and
throwing the shipper lever to move the belt on to the fast pulley again, he fastens
the shipper lever by replacing the eye 41 on the bracket hook 37 and the machine
may run as before until the tap is again full of nuts and trips the shipper.
It is apparent that some changes from the specific construction herein disclosed
may be made and therefore I do not wish to be understood as limiting myself to
the precise form of construction shown and described, but desire the liberty to
make such changes, in working my invention, as may fairly come within the
spirit and scope of the same.
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 the longitudinally sliding tap spindle and tap with a
nut rest and the fixed holding jaws having extensions in the longitudinal direction
of the tap, the confronting faces of said extensions having the beveled corners 48
at their outer ends, substantially as described.
2. The combination of a tap with the nut rest, means for holding the nut against
rotating, the swinging nut holder or clamp and mechanism for forcing said clamp
against the nut to hold it squarely on the nut rest, substantially as described.
3. The combination of the conveyer slide, means for reciprocating said slide,
the conveyer and nut holder or clamp mounted to swing on said slide, and means
for forcing the said nut holder or clamp to its work after the conveyer delivers a
nut, substantially as described.
4. The combination of the nut rest, with the nut holder or clamp, a cam for
forcing said clamp to its work, and a yielding connecting mechanism between said
cam and clamp, substantially as described,

page_text: 5. The combination of the longitudinally sliding tap and tap spindle, with the
nut rest, the follower guide, and a yielding follower having a female center in
its end for centering and supporting the forward end of the tap, substantially
as described.
6. The combination of the longitudinally sliding tap and tap spindle with the
nut rest, follower, a weighted lever for continually holding the follower to its
work, and a cam acting at times on said lever to positively move the follower after
each withdrawal of the tapping spindle, substantially as described.
7. The combination of the longitudinally sliding spindle, the tap carried thereby,
the weighted lever acting to move said spindle and tap to its work, a cam for acting
on said lever to withdraw said spindle and tap, and a yielding and sliding follower
in the nut rest for supporting the end of the tap when threading the nut, sub-
stantially as described.
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