Improvements in Machines for Making Wood Screws, Screw Hooks, and Screw Eyes.
Year: 1890

page_text: Date of Application, 15th Apr., 1890-Accepted, 2nd Aug., 1890
COMPLETE SPECIFICATION.
Improvements in Machines for Making Wood Screws, Screw Hooks,
and Screw Eyes.
We, GUSTAV WEBER of Gevelsberg near Barmen, Mechanical Engineer and KARL
JULIUS MAYER of Barmen Germany, Civil Engineer do hereby declare the nature of
this invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
The improvements in wood screw machines patented to us by letters patent
No. 16776 A.D. 1888 November the 19th relate to machines for cutting the thread
on wood screws having instead of an ordinary round or conical head a hook or another
one sided head. We have now invented further improvements in that machine having
for their object to simplify the general gearing of it, but especially to enable it to
work wood screws having instead of ordinary and of one sided heads a ring shaped
head; other improvements embodied in the present machine relate to simpler devices
for varying the pitch of the thread, to means for dispensing with the leading screw
and to some minor details of construction.
The new machine is shown on the accompanying drawings and described hereafter.
Those elements of the machine which are known from our other patent No. 1677688
are merely enumerated, where necessary, but no detailed description of them is given
again.
Figure 1 is a plan of the complete machine the reservoir plate arranged at the right
side of the machine,
Figure 2 is an elevation, seen from the front,
Figure 3 is an elevation seen from the left,
Figure 4 is an elevation seen from the right,
Figure 5 shows the taking up apparatus as seen from the right side,
Figure 6 shows the same as seen from the front,
Figure 7 is a top view of the same,
Figure 8 is a similar view as fig. 5 showing the upper part of the taking up device
in its left position,
Figure 9 shows the screw carrier turned back and seen from the top,
Figure 10 is a vertical view of the same,
Figure 11 shows it turned forwards,
Figure 12 is a vertical view of fig. 11,
Figures 13 & 14 are vertical views of the carrier showing the pincers putting the
screw into the clamps,
Figure 15 is a side view showing the gearing of the carrier,
Figure 16 is a cross section of that gear,
Figure 17 is a plan of the same,
Figure 18 shows the arrangement for stopping the clamps,
Figure 19 is a front view of fig. 18,
Figure 20 shows a ring screw in full size,
Figure 21 is an elevation of the complete machine with the reservoir plate placed
at the back side of the machine and with the improved thread gear,
Figure 22 is a plan of the same,
Figure 23 is an elevation seen from the right,
Figure 24 is an elevation seen from the left,
Figures 25, 26, 27 & 28 are details of the new device for dispensing with the leading
screw,
Figures 29-34 are details of the new device for varying the depth of the cut,
Figures 35-37 show a modification of the stopping gear for the clamp spindle,
Figures 38, 38a & 39 show details of the device for putting the screws into the
carrier used with the modified machine having the reservoir plate at the side,
D
21

page_text: Figures 40-43 show details of the similar device used with the machine having the
reservoir plate at the back,
Figures 44-47 show details of a modified screw carrier arrangement,
Figures 48-51 show a friction gear for stopping the clamp spindle,
Figures 52-55 show in detail how the screw bolt is placed into the clamp and the
arrangement for advancing and withdrawing the countermandril,
Figures 56 & 57 are respectively a front view and a plan of the end part of the
clamp spindle showing the relative positions of the pointer chisel & of the thread
cutter,
Figure 58 is a longitudinal section of the clamp spindle,
Figure 59 shows the end of the screw carrier in full size.
The whole machine is mounted upon a frame 1 and it is worked in a similar manner
as the machine patented A.D. 1888 Nov. 19th No. 16776, by spindle 3 resting in
bearings 2. On the shaft 3 is keyed the main driving pulley 4 and to its right end is
keyed the pinion 5, being in gear with the spur wheel 6, upon the leading spindle 7;
the latter is carried in bearings 8 and has fixed upon its outer end the pinion 9
which transmits the rotation to the spur wheel 10. The wheel 10 is keyed on shaft 11
and inside of the same is mounted the pinion 13 which is in gear with the wheel 14
upon shaft 15 and on the latter is fixed the pinion 17 which again is in gear with the
wheel 18 upon shaft 11.
The rotary motion of the machine is thus the same as of the patented machine named.
Also the excentrics, cams and other devices for changing the rotary motion into
rectilinear and oscillating movements are arranged in similar manner as with the
machine for making the hook screws. On shaft 11 is also keyed a pulley 19 for
driving the reservoir plate containing the unfinished bolts. A strap or cord leading
from 19 over the guide rollers 20 to the pulley 21 which is keyed to the vertical
spindle 24 held by a bracket 22 which serves at the same time as support for the
reservoir plate 23 on spindle 24.
So far the general arrangement of the new machine does not materially differ from
that of the patented machine for making screws with one sided heads and we have
now to describe the special arangements invented and introduced for making wood
screws having a ring shaped head and also the other improvements made to simplify
the machine.
1. TAKING UP THE BOLTS FROM THE RESERVOIR PLATE, Figs. 1, 2, 3 & 5, 6, 7 & 8.
On the left side of the machine is fixed a bracket 22a corresponding to the bracket 22
and both these brackets serve to hold a cross piece 25, the lower edge of which has a
peculiarly curved shape. This curve serves as a guide for the taking up pin. Below
the curved cross piece is fixed to both brackets a round cross bar 26 on which the
taking up apparatus is suspended so that it can be shifted to and fro and round which
it can swing up and down to a certain extent.
The taking up apparatus proper consists of an arm 28 bent at right angle and fixed
to a long box 27; to the front end of the horizontal part of the arm 28 is fixed by a
link joint a lever 29 so that it can be turned up and down and by its own weight it
has the tendency like the arm 28 to fall down; a set screw 30 bearing upon arm 28
prevents it from falling deeper than is desirable, and the higher or lower position of
the lever 28 is governed by its relative position to the curved edge of the cross piece 25
in lateral direction.
In the front end of the lever 29 is fixed a pin 31 carrying a triangular piece 32
which can oscillate upon 31 (see also figures 38, 38a & 39). A spiral spring placed
round the pin 31 tends to turn the triangle towards the left and a finger 33 of the
boss 34 at the end of the pin 31 limits this turning by striking against a pin 334 in
the triangle. Towards the right the triangie is free to turn at will. The bent arm 28
holds the taking up pin 35 which glides with its hind end below and along the curved
edge of the cross piece 25 and thus governs the vertical position of the arm 28 and
the angular position of the bar 26 as well as the position of its own pointed end. The
position of the box 27 and its accessories in a lateral direction depends upon the

page_text: position of the lever 36 and this again is governed indirectly by the cam shaped
projection 87a of the drum 87. A spring 37a tends to pull the lever towards the
right, that is towards the reservoir plate. The oscillations of the lever 36 to the right
and left are caused at the proper moment by a connecting rod 37 being joint to the
slide bar 38 which, as we shall see further on, governs the taking up apparatus and
which is pressed towards the left by the cam 87º.
When the lever 36 shifts the pieces enumerated to and fro on the bar 26, the pin 35
glides along below the cross piece 25 so that at the proper moment the front end of
that pin is raised above the edge of the reservoir plate. Inside of the plate the pin
reaches nearly to the bottom of the plate, leaving about the thickness of a screw free,
so that by the rotation of the plate filled with unfinished screws, these are pinned up
on the taking up pin.
During this the triangle 32 is also raised a little; for this purpose the boss of the
triangle is provided with an arm 39 and this arm bears upon a rod 39a, fixed to a
standard 396, when the triangle with the other pieces is pushed into the reservoir
plate and it is thus raised above the pin so that it does not hinder the bolts being
pinned up. When then the complete taking up device moves again towards the left,
the triangle falls down to the position allowed by the set screw 30 in bearing upon the
lever 28, that is just deep enough to prevent the arbitrary sliding off of the bolts from
the pin when it is out of the plate (fig. 8).
The foregoing arrangement is for the reservoir plate placed at the right side of the
machine; we shall now describe the modification.
WITH THE RESERVOIR PLATE AT THE BACK SIDE OF THE MACHINE, FIGS. 21-24
AND 40-43.
The figures 21-24 show the general arrangement of this modified machine. The
vertical spindle 40 carrying at its top the reservoir plate 41 of same design as the
plate 23 is held and guided in a bracket 42 bolted against the machine frame 1..
By means of a belt and the pulley 43 driven from shaft 11 it receives its rotary motion.
The pulley 43 serves at the same time to hold the spindle and the plate in
proper position in a vertical direction. At the same side of the machine frame,
right of the bracket 42 is bolted to it the bracket 44 carrying the two vertical
bars 45 and 46. The bar 45 carries at its top in a forked link joint a bell crank
lever 47 reaching with its horizontal arm over the reservoir plate about to the
middle of it and being prevented from falling down and held in its proper position
over the reservoir plate by an adjustable elbow bar 49 on the one side fixed in the
bar 46 and by a set screw 48 in the vertical arm of the lever 47 and bearing upon
the bar 45 when this together with the lever 47 is raised, as we shall explain
presently.
Now on the end of the bellcrank lever 47 is mounted a sort of a triangle 50,
corresponding to the triangle fig. 38 & 39 described above and having to fulfill the
same functions, that is to say, to take off one by one the bolts gathered on the
taking up pin 51 and to deliver them into the carrier. For this purpose the taking
up pin is fixed in the upright bar 45 and secured thereto by a bolt 52 from the
top. The pin 51 reaches into the plate 41 nearly to its bottom and in the branches
or sides of the triangle 50 are fixed the two pins 53 having their ends not reaching
quite as deep as the pin 51 and kept asunder about by the thickness of a screw bolt
in the direction of that pin. Therefor when the plate 41 is filled with bolts and is
turned round, the bolts are pinned up with their rings on pin 51.
Now in order to take the bolts off from the pin 51 and place them into the carrier
we have designed the following device :
On the left face of the wheel 18 we fix a cam 54 just opposite an arm 55 which is
fixed to the upright bar 45 so that the cam 54, when the wheel 18 is turned
round in the direction indicated, strikes against the arın 55 and raises it upwards and
with it, the bar 45 and its accessories.
From the figures 43 & 41 it will be seen that when the bar 45 is raised the arm 47

page_text: The pins 53 being placed just so much one from the other, the right one being the
lower one, that they can catch a bolt between them.
Now from the top of the horizontal arm of bar 46 projects downwards a set
screw 56 and the boss of the triangle 50 is provided with a finger 57 exactly below
the screw 56 and this latter is screwed down so deep that the finger 57 strikes
against it when the bar 45 with the triangle 50 are raised; the consequence is that
the triangle is turned a little, as shown by dotted lines in figure 41, the pin 53
of the right side moves away from the pin 51 and allows the screw between it and
the upper left pin 53 to slip down from the taking up pin 51.
2. TAKING THE SCREW BOLTS FROM THE PIN INTO THE CARRIER AND TRANSPORTING
THEM TO THE PINCERS. FIGURES 1-4; 9-17; 38-39 AND 44-47.
a. FOR THE DESIGN WITH THE RESERVOIR PLATE AT THE RIGHT SIDE OF THE
MACHINE, FIGS. 9-17 & 37-39.
To the spindle 59 which rests in the two end brackets la and 16 (fig. 1 & 4) of the
main frame is keyed the double bent lever 60. spring 58 fixed to the arm 60a
presses the end of the arm 60 against an excentric 61 by which the lever 60 is
oscillated up and down and the arm 60a forwards and backwards. This arm is
connected by a link joint to a connecting rod 62 acting with the other end upon
a rack 63 which is guided in the guides 64. The rack 63 is in gear with a pinion 65
of considerable height and at the opposite side from the rack the pinion is in gear
with a quadrant 66, cast in one piece with the carrier 67. In consequence of the up
and down motion of the bent lever 6 on the excentric 61 and the consequent to and
fro motion of the rack 63, the carrier is caused to describe a circular motion of
about 90° forwards and backwards with its free end and thus this end in its back
position is brought within reach of the taking up pin and in its forward position it is
just within reach of the pincers and so it can receive a screw from the taking up pin
and can carry it to the pincers.
Let us consider first the back position of the carrier figs. 9, 10 & 14.
The carrier 67 is provided with a little roller 68 by which its front end is supported
and guided on its way forwards and backwards upon the screw shaped way 69, in
consequence of which it rises when going back to the taking up pin and it is lowered
on its way forwards. The carrier is therefore mounted losely upon its central
spindle 70; the boss of the carrier and quadrant and the pinion 65 having been made
considerably high for this purpose.
Now when the carrier is in its back position just below the taking up pin this shall
deliver to it one screw and no more.
Therefore the end of the carrier is provided with a sort of a hollow cylindrical
casing 71 cut obliquely-(see detail figure 59);-in the center of this casing is a
conical pin 72, and a ring bolt laid into the casing with the ring surrounding the
central pin 72 can be safely carried by the carrier.
To the central spindle 70 of the pinion 65 is fixed a wire 74 standing about
parallel with the carrier in its back position and with the taking up pin in its left
position. The object of this wire is to raise a little the ends of the screw bolts on the
taking up pin (fig. 38 & 39) when they come within its reach and to push them on
one side, in order that the bolts sliding off from the pin must fall in proper position
into the casing 71.
Now the following device has been designed to cause only one screw and not more
to slide off from the taking up pin.
The lower arch of the triangle 32 is made of two pieces 32a and 326; 32a being
thin, 326 is thicker and shaped like a knife's edge (fig. 38a). Both pieces 32a
and 32 are separated from each other a little more than the thickness of a screw

page_text: +
bolt. In the ordinary position of the triangle the taking up pin 35 is below the
piece 32a (fig. 38), but the triangle can be so turned that the piece 326 comes to stand
over the pin (fig. 39).
For this purpose the spindle 70 is provided with a wire 75 bent round at its outer
end (fig. 13 & 14) and at the top side of the boss of the triangle projects a finger 76..
Now when the triangle moves towards the carrier 67, that is towards the wire 75-
the finger 76 pushes against 75 and the triangle in moving a little further is turned.
a little on its pin 31 as indicated above.
In consequence of this movement of the triangle the sharp edge of the arch
piece 326 enters between the last screw and the last but one on the pin 35 and
the last screw is thus brought between 32a and 326 and so it can slip out between:
the two pieces and slide off from the pin into the casing 71 in a nearly horizontal
position because the end of the screw bolt had been raised before by the bar 74.
(fig. 39).
A spiral spring 73 wound round the pin 31 causes the triangle to take its normal
position again when the carrier moves back so that no further screw bolts can slip off
from the taking up pin.
Now the carrier 67 with the screw in the casing 71 is turned through 90° by the
combined action of the lever 60, the excenter 61, the rack and pinion which cause.
the quadrant at the opposite side of the carrier to be turned in the proper direction.
and so the screw is brought within reach of the pincers.
•
b. FOR THE DESIGN WITH THE RESERVOIR PLATE AT THE BACK SIDE OF THE
MACHINE, FIGS. 44-47 AND 21-24.
We have already explained above, how with this arrangement the screw bolts slip
off from the taking up pin; at the moment when the ring screw drops into the casing of
the carrier 77, which is of similar construction to the one used before, i.e. an obliquely
cut hollow cylinder with a conical pin fixed vertically in the center, the carrier stands.
in the position shown by figs. 21, 22 & 47.
From these figures it will be seen that the carrier 77 turns on a bolt 78 fixed to a
bracket 79 which is bolted on the main frame of the machine. A spring 80 fixed
with one end to the bracket 79 and with the other to the carrier draws the latter
always back in the position shown by fig. 46 so that its end with the casing before
mentioned is within reach of the pincers.
Now it is brought into its back position near the taking up pin by the following:
arrangement:
On shaft 11 is keyed fast a cam 81 which acts in the desired moment with its.
projection upon the lower end of a double armed lever 82, fastened to a bolt on
the bracket 79, whereas the upper end of the lever 82 bears upon a finger 83 at the
opposite side of the carrier 77, therefore when the cam 81 turns the lever 82 out of
its ordinary position its upper end will bring the finger 83 and the carrier 77 from.
the position shown by fig. 46 into that of fig. 47, and when the action of the cam
ceases the springs 80 and 80a will withdraw the carrier and the lever 82 into their
ordinary or forward position so that the screw lying now in the casing of 77 is within
reach of the pincers and now the next operation can begin, namely:
THE TAKING
OF THE SCREW BY THE PINCERS AND PUTTING IT INTO THE CLAMPS..
FIGS. 13 & 14 AND 21, 22 & 52-58.
a. ARRANGEMENT WITH THE RESERVOIR PLATE AT THE SIDE OF THE MACHINE,
FIGS. 13-17.
On the spindle 59 is mounted the elbow lever 84 loose upon it so that it can be
turned with its long boss Sta; a spring 85 fixed to a finger 846 on lever 84 or on
the boss of the pincer lever 89 pulls the lever 84 always in such a direction that its.
lower end 84c is in continuous contact with the circumference of either of the
drums 86 or 87 which are placed one into the other and acting exactly like the
1

page_text: and lever 84 and 84a towards the left and a projection 88 on the inner drum 86
presses it towards the right when it comes in its way during the rotation of that
drum.
Now to the long boss 84a is also fixed the lever 89 of the pincers 90 and when the
leyer 84 goes downwards on the drum 86 the pincers 90 take hold of the screw in
the carrier, then by the further turning of the drum the rise 91 on this drum raises
the levers a little again so that the pincers can lift the screw out of the pin 72
in the casing 71 and now the carrier moves backwards again to make room for the
pincers that they can go down with the screw (fig. 13 & 14) and bring it central to
the clamp spindle. The cam 88 on the drum 86 presses the lever 84 towards the
right and thus the pincers bring the screw between the clamps, which having been
stopped before, now close and hold the screw fast and the pincers move to the left
again.
These latter mechanisms and the movements caused by them are the same as with
the machine patented Nov. 19th 88 No. 16776; they are not new and need therefore
not to be again specially described.
1
b. ARRANGEMENT WITH THE RESERVOIR PLATE AT THE BACK SIDE OF THE
MACHINE, FIGS. 21, 22 & 52-58.
On the shaft 11 is keyed a cam 93 which when rotating presses with its short
projection 93a against the lever 94; this lever is keyed fast upon or made in one
piece with the spindle 95 resting in brackets of the main frame. Near the left side
end of the spindle 95 (fig. 21 & 54) is fixed to it the pincer lever 96. A glance at
the detail figure 52 now shows that the projection 93a first causes the levers 94 & 96
to go sidewards and down a little so that the pincers 97 can take hold of the screw
in the casing 71 and then the cam: allows it to rise again that the screw may be takon
out of the casing. Now the carrier 77 goes back again towards the reservoir plate
making room for the pincers that they can go fully down within reach of the clamps;
this is caused by the long part 93 of the tam pressing against the arm 94 fig. 53.
A counterweight 98 raises the pincers again as soon as the arm 94 is free from
the cam 93.
It will now be remembered that with the arrangement described before, the pincers
when they had come down and brought the screw in central position to the clamp
spindle were pushed lengthways with the screw towards the clamps so that these
could take hold of the ring of the screw when closing and then the pincers went back
to their upright position.
Now this motion sideways and lengthways with the present arrangement is avoided
by a new device of the clamps and for stopping their rotation.
The clamp spindle is shown in longitudinal section in fig. 58 and the stopping
device is seen from figs. 48-51.
The clamp spindle is on the whole constructed like that of the machine for making
the hook screws, with the exception of the head and the clamps. Instead of using
two movable checks which are pressed together by the central conical pin we now
use one movable cheek 99 (fig. 58) and the other cheek 100 is fast with the head of
the spindle; the movable check is closed in a similar manner as formerly by a pin 101
having a wedge shaped-(one sided conical)-head by which it presses against the
inner arm of the cheek, thus causing its front arm to close and hold fast the screw
placed between it and the fast cheek 100.
The shoulder or collar 102 of the journal of the clamp spindle is provided with a
projecting part 103 into which is cut a conical recess and into this recess a friction
pawl 104 is made to enter in the proper moment, so that the clamp spindle is
stopped with the clamps in the right position for receiving the screw from the
pincers 96.
For this purpose the round bar 105 by means of which, as will be remembered,
tlie clamp spindle is shitted in an axial direction, is provided with an upriglit pin. 106.

page_text: which bears upon a double armed lever 107, having its other end rounded off a little
so that when it is turned to and fro by the bar 105 being shifted forwards and
backwards, it can press against the bar 108 rising from the pawl 104. and bring the
latter out of contact with the piece 103 of the clamp spindle, whereas the spring 109
pressing against the pawl causes it to fall suddenly into the recess of 103 when the
bar 105 is pulled back quickly as it is and so stops the clamp spindle as desired.
A modified arrangement for stopping the clamp spindle while the pincers place
the screw into the clamps is shown by figs. 35-37 and 56 & 57.
To a bracket 138 is fixed a pin 139 and mounted on it is a bellcrank lever 140,
at the end of the upright arm of which is fixed a friction roller 141 and pressed
against the main driving pulley 142, which, as will be remembered, is shifted to and
fro in an axial direction and thus the horizontal arm of the bellcrank lever 140 is
raised or lowered; its end bears upon a finger 143 on the pawl lever 144 which is
fixed to a bracket 145 and when the horizontal arm 140 goes down it withdraws the
lever 144 from the shoulder 146 of the clamp spindle, but when it goes up it allows
the pawl lever 144 to be pulled against the circumference of the shoulder 146 by the
spring 147 and then the pawl falls into the notch 148 in the shoulder 146 and stops
the rotation of the clamp spindle.
As soon as the clamps have taken a firm hold of the screw the pawl 104 or the
other stopping device used-(that which is employed with the hook screw machine
and shown by figs. 1, 2; 18 & 19 requiring no special description again being known
from the patent No. 1677688)-is withdrawn and the clamp spindle begins its rotation
again and now follows:
THE POINTING OF THE END OF THE SCREW.
This can be done in a similar manner and by the same means as with the hook screw
machine patent No. 1677688 and as it is shown in figs. & 2 of the drawing; this
mechanism being known need not to be described here again.
Instead of that arrangement we also employ the new one shown by figs. 21, 22
& 24 of the drawing. Here the tool is brought forwards against the screw in a
rectilinear direction and is withdrawn in the same manner.
For this purpose a bar or spindle 159 is placed in the main frame just opposite the
left side of shaft 11 and upon the latter is keyed fast a cam 160; this cam acts upon
a finger 161 projecting sideways from the bar 159 and being pressed towards the
right by the rotation of the cam 160, spring 162 pressing the bar 159 always towards
the left. At the outer end of the bar is fixed an arm 163 and this carries at its upper
end the slide 164 upon which is fixed the pointing tool 165.
The cam 160 being now so shaped that the bar or spindle 159 will be pushed
forwards, that is to the right by the spring 162 at the desired moment to point the
screw bolt held in the clamps, whereas it is withdrawn by the action of the cam for
the other part of the time.
CUTTING THE THREAD OF THE SCREW.
In order that this can be done properly a counter-mandrel of similar design as
was used with the hook screw machine can be employed to hold the screw bolt so
that it will not be pushed on one side by the cutting tool.
Instead of the older device just mentioned we also use that shown by figs. 21, 22
& 52-54.
Upon the spindle 95 or rather upon the long boss of the lever 96 keyed fast
upon 95 is placed the boss of an arm 110 which can turn on the boss; this arm
is held in its normal horizontal position (fig. 52) partly by the spring 111 fixed
with one end to the machine frame and with the other to a finger 112 projecting
from the boss of the arm 110 and partly by the front part of the arm bearing upon
the countermandril piece 113 and striking under a bar 114 fixed thereto.
From fig. 52 it will thus be seen that the countermandril is held upright with its
head centrally to and minst the
•

page_text: When the pincers go down the countermandril must make room so that the
screw can be put into the clamps and for this purpose a bent finger 115 is bolted
to the side of the arm 110 upon which comes to rest the lever 96 in going down and
then depresses also the arın 110 (fig. 53). By this means the arm 110 is brought
out of connection with the countermandril 113 and this being now free is drawn back
by the spring 116.
The counter mandril is mounted between the center punch screws 117 and 118
being screwed into the sides of the machine frame 1. When the arm 110 has been
fully pressed down and the countermandril is withdrawn this falls over the former so
that they gear into each other as shown by fig. 53; therefore, and because the
spring 111 is stronger than the spring 116, as soon as the lever 96 of the pincers
rises again the arm 110 will follow it and push also the countermandril back in
its upward or horizontal position (fig. 52) so that now the cutting of the screw thread
⚫can begin.
This may be done by using a guide screw and by means of the same mechanisms
known from the hook screw machine and as they are partly shown by figs. 1 & 2.
Instead of this we prefer the arrangement by means of which no guide screw is
required and which gives the further advantage that the pitch of the thread may be
varied at pleasure even while the machine is at work, if desirable to do so.
improved arrangement is shown by figs. 25-33.
This
In place of the spindle 7 with the leading screw formerly used and shown in
figs. 1 & 2, and of the separate left part of that spindle which was connected with the
leading screw spindle by a spring we now use a continuous spindle 119 which does
not rotate completely round, but is free to be turned to a certain extent. At the left
end of this spindle is mounted the cutter head 120-(see also fig. 56 & 57)-and its
right end is carried by a piece 121 lying in a bracket 122 bolted to the machine
frame. In the bracket 122 is lodged a sort of a key 123 at right angle to the
spindle 119 to which is connected the guide piece 124 in such a manner, as will be
seen from fig. 25, that its position with regard to the key 123 can be so varied by
means of a set screw 125 as if it were connected to 123 at the point 126 by a link
joint.
At its right side the piece 121 is slotted through to form a groove into which the
guide piece 124 fits (fig. 25 & 27) bearing upon the back of the groove in the piece 121
with its oblique side, a spring 127 (fig. 20) pulling the spindle 119 always towards
the right, and a spring 128 pulls the key 123 always towards the back side of the
machine.
Now on shaft 11 there is fixed a cam 129 just opposite to the key 123 so that its
inner end bears always upon the circumference of the cam on account of the pull of
the spring 128 and this cam therefore causes the key to go forwards and backwards
according to its excentric shape.
The oblique side of the guide piece 124 sliding forwards and backwards in the
piece 121 pushes it towards the left and allows it to return and thus the spindle 119
and the cutter tool receive the necessary stroke lengthways as is the case with a
guide screw. A glance at fig. 24 will now show at once that in raising or lowering
the end of the guide piece by means of the screw 125 the pitch of the thread can be
varied at pleasure, without it being necessary that any piece be exchanged or the
machine stopped.
In order to be able to cut the thread deep enough by 3, 4 or more consecutive cuts
we have provided the arrangement shown by figs. 22, 21 and 28-33.
On shaft 11 is keyed a disc 130 having grooves or recesses 131; each circum-
ferential part of the disc following in the direction of the rotation 130a, 130b, 130c
having a little larger radius than the preceding one; and opposite to the disc 130 is
mounted on a pin 132 fixed to the machine frame, the double armed lever 133 so that
a projecting piece 134 upon the short or back arm of 133 is in contact with the
circumference of the disc 130 in such a manner that the disc has the tendency
to depress the lever arm or the piece 134 and to raise of course the front arm and to
allow the inner arm to rise for the time that a groove 131 stands opposite of it.

page_text: During the period that the circumferential parts 130a, 1306
glide along
the piece 134 the cutting of the screw thread takes place, and during the short period
that the arm of the lever 133 falls into a groove 131 the cutter tool is withdrawn and
pushed sideways to begin the cutting a new, a second third time.
Now on the front arm of the lever 133 is bolted a piece 135 standing crossways to
the lever, and to this piece 135 is hinged a channel shaped piece 136 and this can be
brought into a more or less inclined position with regard to the piece 135 by means of
a set screw 137 (fig. 31). In the channel piece 136 is bedded a wedge piece 138ª
which can be shifted therein forwards and backwards by a screw 139", and this wedge
picce has its upper face partly flattened and filed down (figs. 34, 32 & 33) so as to
present a sort of a step or rise upon it, the object of which we shall explain presently.
An arm 140 lies upon the wedge piece 138 and slides upon it to and fro, being
fastened to the spindle 119 by a clamp 142 (fig. 29) now according to the inclination
of the channel piece 136 the arm 140 will cause the spinule 119 to be turned a little
inwards and so the cutter in the cutter bead 120 will be pressed closer against the
bolt to be provi-led with the thread, but it will now also be understood that for the
time the piece 140 slides along the flattened part of the wedge the cutter will
be withdrawn from the screw, and this is the case during the time that the tool goes
back to begin a new cut.
The depth of the cut of the chissel is adjusted by means of the adjusting screw 141ª.
The screws 139 and 141ª are secured by counternuts 152 and 153.
The thread being cut, it follows:
THE TAKING THE SCREWS OUT OF THE CLAMPS.
It will be remembered that the bar 38 is pressed towards the left by a projection 87a
on the drum 87, and drawn back by a spring 38a (fig. 1) and so the bars and
levers 150, 150 and 150° and the bar 151 are pulled one way or the other, and at the
right side end of the bar 151 are mounted the nippers 151" which, when going to the
right, take hold of the screw in the clamps and withdraw it when returning to
the left, means being provided that the nippers open then and let the screws drop and
they are then gathered in some suitable receptacle. With the machine having
the reservoir plate at the back side fig. 21 to 24 we employ the arrangement shown by
Gigs. 52-55.
At the end of the spindle 95 we fix a lever 158 and just opposite to the clamp head,
at the left side of the machine we mount on a bracket 154 the half round trough 155
so that it can be turned into the machine (fig. 54) just exactly below the clamps.
The trough is hinged for this purpose under the bracket 154 by means of a bell crank
lever 156a and one arm of this connected to the lever 158 by means of a strong
spring 157 which is strong enough to pull the trough round so that it arrives at its
inner place below the clamps before they open and which allows the lever 158 and its
accessories to turn further until the clamps have opened and let the finished screw
drop. So according to the position of the lever 158 the trough 155 takes the place
shown in full lines (fig. 54) or that shown in dotted lines, in which latter position it
remains only so long until the finished screw has fallen down into it and then
it returns back so that no chippings and metal shavings get mixed with the finished.
screws.
We beg to observe that several of the elements used with the machine patented to
us No. 16776 have been employed, they, being known were not again described in
detail.
Having now particularly described and ascertained the nature of our Inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :
An automatic acting machine for making wood screws having a ring or an eye in
place of the usual head and being distinguished by:
1. The automatic taking up apparatus for ring screws with the reservoir plate at

page_text: the side of the machine, consisting of the elbow arm 28 being capable of moving
transversely to and fro on a round bar 26 and being at the same time able to rock up
and down on this bar and being provided with the triangle 32, the taking up pin 35
in combination with the guide piece 25 and the adjusting bars 38, 74 and the
wire 75.
2. The automatic taking up apparatus for ring screws with the reservoir plate
at the back side of the machine consisting of the vertical bar 45 having an arm 55
fixed to it and a bellcrank lever 47 hinged at its top end with the triangle 50
and the separating pins 53 and the taking up pin 51 in combination with the
lifting cam 54 on wheel 18, the bar 46 and the supporting arm 49 and the
check bolt 56.
3. The device for carrying the screw from the taking up pin 35 of the
arrangement with the reservoir plate at the side of the machine to the clamp
spindle consisting of the excentric cam 61, the lever 60, the rod 62, the rack
and pinion 63 and 65 in combination with the quadrant 66, the carrier 67 and
the screw-shaped guide way 69.
4. The device for carrying the screws from the taking up pin 51, of the arrange-
ment with the reservoir plate at the back side of the machine, to the clamp spindle
consisting of the cam 81 on shaft 11 acting upon a lever 82 pulled towards the
cam by a spring 80" in combination with the carrier 77 being mounted on a bracket 79
and held in its forward position by a spring 80, a lever 82 pressing against a finger 83
and turning the carrier into the back position.
5. The arrangement for stopping the clamp spindle consisting of the grooved
projection 103 on the shoulder of the spindle and the pawl 104 brought in contact
with or released from the groove by the combined action of the bar 105, the pin 106,
the lever 107, and the bar 108.
6. The device for taking the screws from the carrier and placing them into
the clamps distinguished by the double cam 93 and 93a, the arm 94 on spindle 95
in combination with the lever of the pincers 96, the arm 112 and the spring 111.
7. In combination with the device described under 6 the mechanism for with-
drawing and advancing the countermandril, consisting of the arm 110, the finger 115,
the rocking lever 113 carrying the countermandril and being provided with the bar 114
and the spring 116.
8. The device for advancing the cutter head and varying the pitch of the thread
without requiring a leading screw and without exchanging any piece, consisting of the
cam 129 on shaft 11, the key 123 together with the guide piece 124 guided in a
bracket 122, the adjusting screw 125 and the spring 128 in combination with the
spindle 119 and its forked head 121.
9. The notched disc 130 on shaft 11 acting upon a lever 133 on spindle 132
in combination with the cross piece 135, the adjustable channel piece 136 and the
adjusting screws 139° and 141° with the adjustable key or wedge piece 138*.
10. The bell crank lever 140 with friction roller acting upon the pawl 144 in
combination with notches 148 in the shoulder of the head of the clamp spindle.
11. The device for collecting the finished screws in a receptacle 155 swinging
backwards and forwards as required by being connected to the arm 158 on spindle 95
by a spring 157.
Dated this 5th day of April 1890.