Improvements in Machines for Screwing Rods, Tubes, Bolts, and the like.
Year: 1896

page_text: Date of Application, 3rd Dec., 1896
Complete Specification Left, 25th Aug., 1897-Accepted, 9th Oct., 1897
PROVISIONAL SPECIFICATION.
Improvements in Machines for Screwing Rods, Tubes, Bolts, and the
like.
We, CHARLES HENRY PENNING, Engineer, and JoHN JAMES SHIELDS HESLOP,
Grocer, of 11, Fawcett Street, Sunderland, in the County of Durham, do hereby
declare the nature of this invention to be as follows:-
Our invention relates to an improved machine for screwing rods, tubes, bolts
and the like wherein a continuous rotary motion in one direction is imparted
to the dies.
In a machine constructed according to our invention, the dies are mounted in
a carrier made in two parts adapted to move radially to permit of their closing
together upon the article to be screw-threaded and separating to release it.
A locking or clamping device is arranged in conjunction with this divided die
holder and adapted to be operated, to allow the opening of the dies when the
required length of the screw-thread has been formed, by the impingement of the
end of the rod, tube, bolt or the like against a push piece in connection with
the locking device so as to release the latter and allow the parts of the die holder
to separate.
We sometimes arrange in conjunction with the travelling vice, in which the
article being screwed is held during the screwing operation, a spring or other
device for moving back or withdrawing the said article from the dies.
Dated the 3rd day of December 1896.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
COMPLETE SPI
CATION.
Improvements in Machines for Screwing Rods, Tubes, Bolts, and the
like.
We, CHARLES HENRY PENNING, Engineer, and JOHN JAMES SHIELDS HESLOP,
Grocer, of 11, Fawcett Street, Sunderland, in the County of Durham, 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:-
Our invention relates to an improved machine for screwing rods, tubes, bolts
and the like wherein a continuous rotary motion in one direction is imparted
to the dies.
In a machine constructed according to our invention the dies are mounted in
a carrier made in two parts adapted to close together upon the article to be
crew-threaded and to separate to release it.

page_text: A locking or clamping device is arranged in conjunction with this divided die
holder and adapted to be operated to allow the opening of the dies when the
required length of the screw-thread has been formed, by the impingement of the
end of the rod, tube bolt or the like against a push piece in connection with
the locking device so as to release the latter and allow the parts of the die holder
to separate.
We sometimes arrange in conjunction with the travelling vice, in which the
article being screwed is held during the screwing operation, a spring or other
device for moving back or withdrawing the said article from the dies.
To enable our invention to be fully understood we will describe the same by
reference to the accompanying drawings, in which :-
Figure I is a plan view of a screwing machine provided with our improvements;
and,
Figure 2 is a side elevation of the same;
Figure 3 is a section on the line 3-3 Figure 1 drawn to a larger scale than
the said figure; and,
Figure 4 is a section on the line 4-4 Figure 3;
Figure 5 is a face view looking in the direction of the arrow Figure 3; and,
Figure 6 is a view similar to Figure 5 but shewing the parts in a different
position;
Figure 7 is a face view of the vice or holder for the work being screwed.
a is the bed plate of the machine and b is the spindle or mandrel which is
supported in the head o and has fixed to it a belt pulley d through the medium of
which motion is transmitted to the spindle and also a hollow spindle or sleeve e
carrying e¹
a face plate e for carrying the dies f, f. The said dies are not directly
supported upon the said plate but are arranged in holders g, g pivoted to the
said plate e at h, h and adapted to be separated by a cam piece i arranged
between them as shewn in Figure 6, a spring j, connected to the said holders 9, 9
serving to move them towards each other to close the dies when the said holders
are released by the said cam piece.
The cam i is carried upon the shaft supported at one end in the face plate e'
and at the other end in a bearing on the sleeve e, the said shaft being capable
of sliding longitudinally and also of rotating to the desired extent in its bearings.
m is the push-piece against which the end of the rod or the like being screw-
threaded impinges, the said push-piece being carried by an arm m¹ on the shaft k
in such a manner that as the screwing of the rod proceeds the push-piece will be
moved backwards more or less to cause the longitudinal movement of the said
shaft k. It will be noticed that the arm m³ carrying the push-piece is adjustable
upon the shaft k by means of a stop collar and set screw in order to permit
of a rod being more or less screwed before the end of the same comes into contact
with the said push-piece.
The rotary movement of the shaft k necessary for turning the cam piece i to
the position shewn in Figure 6 for separating the die carriers, is effected by the
impingement of an arm a on the shaft k against a trip-piece n' on the head c.
Whilst the screwing operation is taking place this arm n moves past the trip-
piece n² without coming into contact therewith; when, however, the said shaft k
is moved longitudinally under the pressure of the rod or the like being screwed
against the push-piece m the said arm is moved sufficiently to come into the
path of the trip-piece n' whereby the shaft k will be rotated in the desired manner.
In order to afford a relatively large contact surface between the arm and the
trip-piece we pivot the said trip-piece as clearly shewn in Figure 3 in such
a manner that immediately the arm n comes into contact with a point of the
said trip-piece the latter will be moved to the position indicated by the dotted
lines in Figure 1, to afford the necessary bearing surface. A spring n serves to
return the trip-piece to its normal position when the arm n has moved out of
contact with it.
In order to hold the two parts of the die in their proper relative positions during

page_text: the screwing operation we provide the pins o, o, Figures 3 and 4, which slide in
holes o¹, o in the face plate e and when the die carriers are in their working
position engage in the holes o, o therein. These pins o, o are carried by a
cross head mounted on the shaft k between two pins p, p or their equivalents
upon the said shaft in such a manner that whilst the said cross head with the
pins is capable of partaking of the longitudinal movement of the said shaft it
will not partake of its rotary movement.
It will be obvious that before rotating the shaft k to separate the dies it will be
first of all necessary to disengage the pius o, o from the holes 03, 03 in the
carriers 9, 9. This diser gagement of the said pins might be effected by the
pressure of the rod or the like being screwed against the push piece m, sufficient
space being left between the arm wand the trip-piece to permit of the with-
drawal of the said pins before the arm comes into contact with the said trip
piece; as, however, this would put a certain amount of pressure upon the rod
being screwed we prefer to effect the withdrawal of the said pins in the following
manner, We make the arm n capable of rotating slightly upon the shaft k
without imparting movement to the said shaft by forming a notch 7 in the boss
of the arm and by placing a pin g' in the shaft k wherely it will be obvious that
the arm n is free to move independently of the shaft to an extent corresponding
to the length of the notch 7. At the opposite end of the boss of the arm
that in which the notch q is formed we make a cam surface r Figures 3 and 4,
which is adapted to operate in conjunction with a pin r on the sleeve e, the said
cam surface r being arranged in such relation to the slot q that whilst the arm n
is rotating upon the shaft k without moving the said shaft the cam surface will
be acting against the pin l to move back the pins o in the desired manner.
to
With this arrangement it will be understood that when the arm n during the
rotation of the spindle comes into contact with the trip-piece n' the said arm
will first be moved to draw back the pins o out of engagement with the die carriers
and that then the shaft k will be rotated to the desired extent in order to separate
the said carriers.
A springs on the shaft k serves for moving back the said shaft to its normal
position after the arm n has passed out of contact with the trip-piece n'.
The rod or the like to be screwed may be carried in any suitable manner. In
the drawing we have represented a sliding tube t as being arranged in a head
carried on the bed plate a, the said tube at that end adjacent to the dies being
provided with a suitable vice or gripping device, a front view of the jaws u, u
of which is shewn in Figure 7, the said jaws being carried by two levers u', u¹
provided with adjusting screws r, r.
w is a spring which normally tends to move the tube t to its rearward position
in such a manner that immediately the dies are opened, the rod or the like being
screwed will be drawn back. This spring w is shewn as arranged around a rod
which at one end slides through a post on the head t whilst the other end is
fixed to a projection upon the tube t.
y is a lever pivoted on the tube t' and formed at one end with a handle whilst
the other end is designed to press against a stop which forms a fulcrum for the
said lever in such a manner that when the lever is moved in the direction of the
arrow, Figure 1, the tube will be moved forward towards the dies. The object
of this lever is to permit of pressing the rod or the like to be screwed against
the dies until it enters between them in a manner which will be readily understood.
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. In a machine for screwing rods, tubes, bolts and the like, the combination of
a vice for holding the article to he screwed against rotation and of a die carrier
adapted to be continuously rofated, the said die carrier being provided with

page_text: means for automatically separating the dies when the desired length of screw-
thread has been cut, substantially as described and illustrated in the accompanying
drawings.
2. In a screwing machine a rotary die carrier in combination with a push-piece
adapted to be operated by the impingement of the rod or the like being screwed
against it the motion so produced being utilized for unlocking the dies and allow-
ing them to be separated for releasing the work, substantially as described and
illustrated in the accompanying drawings.
3. In a screwing machine the combination of die holders pivoted upon a face
plate and adapted to be separated to release the work by means of a cam piece
to which motion is imparted by the movement of an arm against a fixed trip-piece
the said arm being moved into the path of the trip-piece when the desired length
of a rod or the like has been screwed through the medium of a push-piece operated
by the movement of the said rod or the like against it, substantially as described
and illustrated in the accompanying drawings.
for screwing rods, screws, bolts and the like hereinbefore described and illustrated
in the accompanying drawings.
the accompanying drawings
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.