Improvements connected with Screw Cutting Machines for Rounding Off, Pointing, and Screw Threading the Blanks.
Year: 1893

page_text: Date of Application, 22nd Mar., 1893
Complete Specification Left, 25th Oct., 1893-Accepted, 16th Dec., 1893
IDIONAL DI MUITIVATION,
Improvements connected with Screw Cutting Machines for Rounding
Off, Pointing, and Screw Threading the Blanks.
A communication by FRANZ WEYRER, of 13, Graben, Vienna, in the Empire of
Austria, Machine Maker.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E.. of the Agency for
Foreign Patent Solicitors, 6 Lord Street, Liverpool, and 6 Bank Street,
Manchester, both in the County of Lancaster, and 323 High Holborn, in the
County of Middlesex, Civil Engineer, do hereby declare the nature of this
invention to be as follows:-
By means of this invention it is possible to simultaneously perform the pointing,
rounding off and thread cutting on screws made of shaped iron.
Such an apparatus is shown on the accompanying drawings, in which :-
Figure 1 is a longitudinal section of the screw holding device:
Figure 2, a side view of Figure 1:
Figure 3, an exterior view of the holding device :
Figure 4, a section on the line II of Figure 1:
Figure 5, a section on the line II II of Figure 1 :
Figure 6, a front view of the head of the holding device:
Figures 7, 7, 7", details of construction of the clamp cheeks:
Figure 8 is a view of the automatic warning device when the machine becomes
empty:
Figure 9, a front view of the support employed when the screws are to be
operated upon (for pointing, rounding off and cutting the thread):
Figure 10, a rear view of Figure 9:
Figure 11, a side view of Figure 10 in the direction of the arrow p* :
Figure 12, a section on the line III III of Figure 9:
Figure 13, a side view of Figure 9 in the direction of the arrow pr
Figures 14 and 14ª are longitudinal and cross sections of the adjustable buffer
for the lifting or moving apparatus for the revolving knife and the screw cutting
cheeks.
Figure 15 is a view of the whole apparatus in a working condition, at the
moment of the pointing movement :
Figure 16 is a view of the working apparatus at the moment of cutting the
screw thread.
Figure 17 is a view of the driving mechanism of the whole apparatus and
Figure 18 is a side view of Figure 17.
In the following Specification, the screw holding device will first be described,
then the cutter support, and lastly the combined action of both devices.
On the shaft or spindle 1, which has a slot or groove 2, a head 3 is situated in
which two lever like parts 4 4 are movably arranged on a bolt 3ª, and carry on
the one hand the clamp cheeks 5 5 and on the other the movable runners 6 6.
The clamp cheeks 5, which hold fast the screw S during the whole time it is
being operated upon, have pieces 5" 5ª corresponding to the head of the screw, in
which the said head fits. According to its geometrical form, the parts cut out do
not form a complete semicircle but only a circular segment so that the screw must
be held absolutely firmly.
The levers 4 of the cheeks are moved towards one another by means of spiral
springs 7 7.
In order that the screw S may according to requirements be clamped firm or
[Price 8d.]

page_text: released, a coupling box 8 is adjustably placed on the shaft 1 but revolves (groove
and spring) with the same, which coupling box may be pushed backwards and
forwards under the influence of a lever 9 (Figures 1 and 15).
This coupling box (sleeve) 8 is attached to the head 3 of the spindle 1 by means
of 6 strong spiral springs 10 10, it therefore usually presses itself between the
rollers 6 6, moves thereby the check levers 4 4, and thereby the clamp cheeks 5
close automatically round the screw S. Only a perfect drawing away, or the
compression of the spiral springs 10 thereby caused, allows the levers 4 4 to
approach by means of the spiral spring 7 at their roller parts, that is to say, to
separate at their clamp parts and thus to release the gripped screw S.
If the clamp cheeks 5 5 come quite together, that is to say, no screw is held
between them, the sleeve 8 may, in consequence of the springs 10, come against the
stop 11 on the spindle 1; thereupon, however, the clip lever 12, Figure 8, is forced
upwards and raises with it the lever 15 which is pivotted on 13 and actuated by a
spring 14, and this lever 15 thus strikes against a bell 16, whereby the person in
charge of the machine is warned that no more screws are being supplied thereto.
The support which effects the cutting off of the points and the cutting of the
thread, consists of two cutting cheek holders 18 18, Figure 9, etcetera (sliding in a
circular guide groove 17) which may be moved together or separated by means of
the levers 19, 20 and 21.
The equal armed lever 21, pivotted on a pin 22, has an arm 23 which carries the
contact buffer. This contact buffer, which is shown in detail in Figures 14 and 14ª,
consists of a tubular case 24" with a cover 24 which can be screwed on.
In the case, there is a small piece of tubing 24°, which clips the nut 24d firmly
by means of the cover 24 and also thereby gives the tappet 24°, which has a screw
thread 24', a fixed position.
This arrangement has for its object to allow of a more exact adjustment of the
motion of the cutting cheeks from the driving mechanism, which is obtained by
adjusting up or down the tappet 24°. The cutting cheek holders 18, 18, carry the
tbread cutting dies 25, 25, which may be adjusted by means of the screws 18 and
fixed by means of the screws 18°.
The spiral spring 26 holds the arm 23 with the tappet 24° always firm on its
driving eccentric on which it rubs.
The front part of the support carries the arm. 28, which revolves on the pivot 27,
which arm carries, in the head 29, the kuife or tool 30 for turning out the
points.
This arm 28 also receives its motion by means of a contact buffer 32, seated on
a connecting arm 31 (such buffer being precisely similar to the one hereinbefore
described) from a tappet 32° which rubs on an eccentric disc. The spiral spring 33
causes, in this case, also a continuous resting of the tappet 32° on its operating
disc, whilst a pin serves, in combination with the screw 36, attached by means of
an arni 35 to the prismatic guide 17, for limiting the stroke of the knife 30.
The connecting arm 37 is connected, on the one hand, with the pin 38, on the
arm 31, and, on the other hand, with an elbow lever, 39, which latter revolves on a
fixed pin A on the frame of the machine.
The motion imparted to the arm 28 is thereby transferred by means of the bar 40
to the lever 42 which turns on the pivot 41, and this lever 42 imparts the necessary
movement to the arm 45 with the stopping cylinder 46, by means of its head 43 and
the tappet 44 adjustable by means of the nut 44 and counter nut 44b. The spiral
spring 47 insures that the tappet 44 always follows the circumference of the
head 43.
The two tappets 24° and 32° are actuated from the two eccentric discs 48 and 49,
Figures 15, 17, & 18.
The combined action of the clamp cheek holders with the support, when a screw
is to be made, takes place in the following manner, and it may be here mentioned
that, during the period of turning the points and cutting the threads, the grooved
shaft 1 is revolved by means of a spur wheel 52:-

page_text: A receptacle containing unfinished screws is arranged over the clamp -
cheeks 5,5, between which one screw at a time is conveyed by means of any known
mechanism.
During this operation, a lever 50 has shifted, by means of a ring, the shaft 1
with its head so far back that the end 1* encounters a fixed point 1b, and the
lever 9 then returns the sleeve 8 in the manner described at the commencement, the
clamp cheeks 5, 5 open, and the screw which is to be operated can pass between
the same.
At the same moment, the sleeve 8 moves forward under the influence
of the returning motion of the lever 9, as well as the pull of the spring 10, the
clamp cheeks 5, 5 close and hold the screw S firmly clutched.
After this operation, the lever 50 pushes the whole shaft 1, together with the
clamp head, against the support; the screw S passes in front of the thread cutting
tools 25, 25. The shaft 1 then remains stationary, and the stopping cylinder 46
comes into the position shown in Figures 9 and 15 by the lifting of the buffer 32
through the eccentric 48, or the movement of the series of levers 37, 39, 40 and 42,
connected there with, and thus holds the screw bolt in an exactly central position
during the then proceeding turning off of the point by means of the cutter 30.
During the pointing, the arm 45, with the stopping cylinder 46, remains at rest
as the tappet 44, during this operation, completes a dead movement on the circular
track of the head 43. When the turning off of the point is completed, the
tappet 32 again drops downwards in consequence of the movement of the eccentric
disc 48, the arms 28 and 45 separate, and a further pushing forward of the shaft 1,
by means of the lever 50, brings the screw bolt S between the thread cutting
tools 25, 25, which had in the meantime closed, Figure 16, by the action of the
eccentric disc 49, or by the lifting of the tappet 24. By the above uninterrupted
movement of the shaft 1, the cutting of the screw thread on the screw S is effected.
The desired length of screw thread being attained, the tappet 24 again drops
downwards on the eccentric disc 49. The cutting tool holders 18, 18 open, as well
as the cutting tools 25, 25, the shaft 1 then moves so far back, in consequence of
the then commencing retrograde movement of the lever 50, that it again encounters
the fixed point 1b, whilst the sleeve 8 is again drawn back by means of the lever 9.
so that the clamp cheeks 5, 5 open and the finished screw falls out through the
recesses 5, 5* A fresh screw then drops from the receptacle before mentioned.
between the clamp cheeks, these latter close, and the whole process of pointing
and thread cutting is again repeated.
The eccentric discs 48 and 49 must, of course, receive motion in any known way,
as also the levers 9 and 50 and the spur wheel 52 in order to produce the effects
of the apparatus hereinbefore described.
1 1000
WM. P. THOMPSON & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements connected with Screw Cutting Machines for Rounding
Off, Pointing, and Screw Threading the Blanks.
A communication by FRANZ WEYRER, of 13, Graben, Vienna, in the Empire of
Austria, Machine Maker.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors, 6, Lord Street, Liverpool and 6 Bank Street, Manchester
both in the County of Lancaster and 323 High Holborn in the County of
Middlesex, 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 :-
By means of this invention it is possible to simultaneously perform the pointing,
rounding off and thread cutting on screws made of shaped iron.

page_text: Such an apparatus is shown on the drawings which accompanied the rovisional
Specification, in which,
Figure 1 is a longitudinal section of the screw holding device;
Figure 2, a side view of Figure 1;
Figure 3, an exterior view of the holding device;
Figure 4, a section on the line II of Figure 1 ;
Figure 5, a section on the line II II of Figure 1 ;
Figure 6, a front view of the head of the holding device;
Figures 7, 74, 7B, details of construction of the clamp cheeks;
Figure 8 is a view of the automatic warning device when the machine becomes
empty;
Figure 9, a front view of the support employed when the screws are to be
operated upon (for pointing, rounding off and cutting the thread);
Figure 10, a rear view of Figure 9;
Figure 11, a side view of Figure 10 in the direction of the arrow p* ;
Figure 12, a section on the line III III of Figure 9 ;
Figure 13, a side view of Figure 9 in the direction of the arrow p.
Figures 14 and 14ª are longitudinal and cross sections of the adjustable buffer
for the lifting or moving apparatus for the revolving knife and the screw cutting
cheeks.
Figure 15 is a view of the whole apparatus in a working condition, at the
moment of the pointing movement;
Figure 16 is a view of the working apparatus at the moment of cutting the screw
thread.
Figure 17 is a view of the driving mechanism of the whole apparatus; and
Figure 18 is a side view of Figure 17.
In the following Specification, the screw holding device will first be described;
then the cutter support, and lastly the combined action of both devices.
On the shaft or spindle 1, which has a slot or groove 2, a head 3 is situated in
which two lever like parts 4 4 are movably arranged on a bolt 3*, and carry
on the
one hand the clamp cheeks 5 5 and on the other the movable
runners 6 6.
The clamp cheeks 5, which hold fast the screw S during the whole time it is
being operated upon, have recessed pieces 5* 5* corresponding to the head of the
screw, in which the said head fits. According to its geometrical form, the parts
cut out do not form a complete semicircle but only a circular segment so that the
screw must be held absolutely firmly.
The levers 4 of the cheeks are moved towards one another by means of spiral
springs 7 7.
In order that the screw S may according to requirements be clamped firm or
released, a coupling box 8 is adjustably placed on the shaft 1 but revolves with
the same, which coupling box may be pushed backwards and forwards under the
influence of a lever 9 (Figures 1 and 15).
This coupling box (sleeve) 8 is attached to the head 3 of the spindle 1 by
means of 6 strong spiral springs 10 10, it therefore usually presses itself between
the rollers 6 6, moves thereby the cheek levers 4 4, aud thereby the clamp
cheeks 5 close automatically round the screw S. Only a perfect drawing away, or
the compression of the spiral springs 10 thereby caused, allows the levers 44 to
approach by means of the spiral spring 7-7 at their roller parts, that is to say,
to separate at their clamp parts and thus to release the gripped screw S.
If the clamped cheeks 5 5 come quite together, that is to say, no screw is held
between them, the sleeve 8 may, in consequence of the springs 10, come against
the stop 11 on the spindle 1, thereupon, however, the clip lever 12, Figure 8, is
forced upwards and raises with it the lever 15 which is pivotted on 13 and
actuated by a spring 14, and this lever 15 thus strikes against a bell 16, whereby
the person in charge of the machine is warned that no more screws are being
supplied thereto.

page_text: The support which effects the cutting off of the points and the cutting of the
thread, consists of two cutting cheek holders 18 18, Figure 9, etcetera (sliding in a
guide groove 17) which may be moved together or separated by means of the
levers 19, 20 and 21 (Figure 12).
The equal armed lever 21, pivotted on a pin 22, has an arm 23 which carries.
the contact buffer. This contact buffer, which is shown in detail in Figures 14-
and 14, consists of a tubular case 24° with a cover 24 which can be screwed on.
In the case, there is a small piece of tubing 24, which clips the nut 24ª firmly
by means of the cover 24° and also thereby gives the tappet 24, which has a.
screw thread 24', a fixed position.
This arrangement has for its object to allow of a more exact adjustment of the
motion of the cutting cheeks from the driving mechanism, which is obtained by
adjusting up or down the tappet 24. The cutting cheek holders 18, 18, carry
the thread cutting dies 25, 25, which may be adjusted by means of the screws 18*
and fixed by means of the screws 18b (Figures and 12).
The spiral spring 26 (Figure 10) holds the arm 23 with the tappet 24° always:
firm on its driving eccentric on which it rubs.
The front part of the support carries the arm 28, which revolves on the pivot 27,.
which arm carries, in the head 29, the knife or tool 30 for turning out the points.
This arm 28 also receives its motion by means of a contact buffer 32, seated on
a connecting arm 31 (such buffer being precisely similar to the one hereinbefore.
described) from a tappet 32° which rubs on an eccentric disc. The spiral spring 33.
causes, in this case, also a continuous resting of the tappet 32° on its operating.
disc, whilst a pin 34 serves, in combination with the screw 36, attached by means
of an arm 35 to the prismatic guide 17, for limiting the stroke of the knife 30-
(Figure 11).
The connecting arm 37 is connected, on the one hand, with the pin 38, on the
arm 31, and, on the other hand, with an elbow lever 39, which latter revolves on
a fixed pin A on the frame of the machine.
The motion imparted to the arm 28 is thereby transferred by means of the.
bar 40 to the lever 42 which turns on the pivot 41, and this lever 42 imparts the-
necessary movement to the arm 45 with the stopping cylinder 46, by means of its
head 43 and the tappet 44 adjustable by means of the nut 44" and counter nut 44°.
The spiral spring 47 insures that the tappet 44 always follows the circumference.
of the head 43.
The two tappets 24 and 32° are actuated from the two eccentric discs 48 and.
49, Figures 15, 17 and 18.
The combined action of the clamp cheek holders with the support, when a screw
is to be made, takes place in the following manner, and it may be here mentioned
that, during the period of turning the points and cutting the threads, the grooved
shaft is revolved by means of a spur wheel 52.
A receptacle containing unfinished screws is arranged over the clamp
cheeks 5, 5, between which one screw at a time is conveyed by means of any
known mechanism.
During this operation, a lever 50 has shifted, by means of a ring 51, the shaft 1
with its head 3 so far back that the end 1ª encounters a fixed point 1b, and the
lever 9 then returus the sleeve 8 in the manner described at the commencement,.
the clamp cheeks 55 open, and the screw which is to be operated can pass between
the same.
At the same moment, the sleeve 8 moves forward under the influence
of the returning motion of the lever 9, as well as the pull of the spring 10, the
clamp cheeks 5, 5, close and hold the screw S firmly clutched.
After this operation, the lever 50 pushes the whole shaft 1, together with the
clamp head, against the support; the screw S passes in front of the thread cutting
tools 25, 25. The shaft 1 then remains stationary, and the stopping cylinder 46.
comes into the position shown in Figures 9 and 15 by the lifting of the buffer 32
through the eccentric 48, or the movement of the series of levers 37, 39, 40 and 42,.

page_text: connected therewith, and thus holds the screw bolt in an exactly central position
during the then proceeding turning off of the point by means of the cutter 30.
During the pointing, the arm 45, with the stopping cylinder 46, remains at rest
as the tappet 44, during this operation, completes a dead movement on the
circular track of the head 43. When the turning off of the point is completed,
the tappet 32 again drops downwards in consequence of the movement of the
eccentric disc 48, the arms 28 and 45 separate, Figure 6, and a further pushing
forward of the shaft 1, by means of the lever 50, brings the screw bolt S between
the thread cutting tools 25, 25, which had in the meantime closed, Figure 16, by
the action of the eccentric disc 49, or by the lifting of the tappet 21. By the
above un-interrupted movement of the shaft 1, the cutting of the screw thread on
the screw S is effected. The desired length of screw thread being attained, the
tappet 24 again drops downwards ou the eccentric disc 49. The cutting tool
holders 18, 18, open, as well as the cutting tools 25, 25, the shaft 1 then moves so
far back, in consequence of the then commencing retrograde movement of the
lever 50, that it again encounters the fixed point 1b, whilst the sleeve 8 is again
drawn back by means of the lever 9 so that the clamp cheeks 5, 5, open and the
finished screw falls out through the recesses 5*, 5". A fresh screw then drops
from the receptacle before mentioned between the clamp cheeks, these latter close,
and the whole process of pointing and thread cutting is again repeated.
The eccentric discs 48 and 49 must, of course, receive motion in any known way,
as also the levers 9 and 50 and the spur wheel 52 in order to produce the effects
of the apparatus hereinbefore described.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is-
1. A device for rounding off pointing and cutting the thread in screw cutting
machines in which the screw to be treated is first held fast by means of movable
clamp cheeks 5, 5, and then conveyed to an automatic support for the object of
being pointed, rounded off and having the thread cut, substantially as described.
2. In an apparatus such as described in Claim 1, the arrangement of the clamp
cheek levers 4 4 and the movable runners 6, 6, movable in the head 3 of the
grooved spindle 1, as
well as
the adjustable coupling box (sleeve) 8 for
automatically opening or closing the clamp cheeks 5 5 by means of spiral
springs 7 and 10.
3. In the holding device such as described in Claim 2 the arrangement of a
toothed wheel 52 on the grooved shaft 1 for revolving the latter from time to
time when turning the point and cutting the thread on the screw bolt which is to
be treated, as well as of the fixed point 1' against which the shaft 1 strikes when
the spring 10 expands.
4. In the apparatus such as described in Claim 1, the arrangement of two cutting
cheek holders 18, 18, adjustable in a fixed prismatic guide 17, by means of a lever
mechanism, or a tappet 24°, as well as of the knife 30 attached to the revolving
arm 28, which knife receives its movement from the tappet 32° and communicates
it to the stopping cylinder 46 by means of the series of levers 37, 39, 40 and 42,
by which means a central position of the screw bolt whilst being pointed is
insured.
Dated this 24th day of October 1902
WM. P. THOMPSON & Co.,
Agents for the Applicant.