IMPROVEMENTS IN SCREW STOCKS AND SUCH LIKE SCREWING APPLIANCES
Year: 1884

page_text: I, JOHN BENTLEY of Ryland Road Edgbaston, near Birmingham in the County
of Warwick, Engineer, do hereby declare the nature of said invention for
IMPROVEMENTS IN SCREW STOCKS AND SUCH LIKE SCREWING APPLIANCES to be
as follows:-
"6
"
Screw stocks or screwing appliances have heretofore been provided with fixed
guides, which form steadying rests, in which an object to be wormed is placed;
that is, the guides which are made in one piece, are disposed in front of the cutting
dies. In the case of a solid die, the guide is concentric, and is only efficient when
being used with an object of the same diameter; and further, the feed screw which
carries forward a half die, leaves it there on its withdrawal.
By my said invention, the defects referred to are remedied, by making the
guides adjustable to suit the varying diameters or sizes of objects to be wormed.
The feed screw is made to travel the half die, both backward and forward when
rotated either in one or other direction.
In carrying out my invention, the guides are made in halves or in segments,
respectively affixed to the half dies of the screw stock by pins, rivets or by any
other suitable means; that is, the guide consists of a short tube or sleeve divided
longitudinally or in segments which are respectively attached to, and move with
the half dies, thereby rendering the guide adjustable to suit any required diameter.
or size of object to be wormed. The axis of the half guides always remaining
perfectly concentric with the axis of the cutting orifice enclosed between the half
dies; thus the change of position of the half die to worm a greater or less object,
never disturbs the concentricity of the guide with respect to the cutting edges of
the dies.
By making guides thus adjustable, so as to embrace or truly encircle the object
to be wormed, it constitutes a true guide and rest; and the objects wormed by
the screw stock or guides provided with such a guide are both true and efficiently
cut.
The method of carrying back a half die on the screwing back of of the feed screw
is effected as follows,

page_text: The feed screw for advancing the half die for bringing it upon its work may be
an independent screw which passes through the frame of the stock which may be
oblique or otherwise, or the feed screw may be made upon the end or a continuation
of one of the handles of the stock. The terminal inner end of the feed or advancing
screw is connected to the back of a half die, so that on rotating either in one or
other direction of the feed screw, the half die is made to advance or retire from the
other half die, consequent upon the diameter of object to be wormed, so that the
half die is made to slide backward or forward while the feed screw or object
moving it rotates, the connection between the movable half die and the end of the
feed screw or other advancing expedient is effected by a clutch like piece which
lies within a cut away part in the back of the die, so that the requisite motion or
drawing back is effected as described. A like connection may be effected by
inserting the end of the feed screw into a hole or cavity in the back of the die,
and connecting the parts together by a lateral screw pin which takes into a groove
or annular depression formed near the end thereof; and further, the end of the
feed screw may have a circular boss which takes into a suitably shaped hole in the
back of the die.
.
By such means, the withdrawal of the half die is effected in a simple and efficient
manner; so that the cutting edges of the movable die, can be taken out of the
threads of the object wormed, without the necessity of reversing the stock or
causing the cutting edges of the dies to travel again over the worm already cut.
The application of my invention to other screwing appliances differs in no
essential respect from its application to a screw stock.
Dated this twanto fourth day of Decembex 1001
JOHN
BENTLEY.
By Henry Skerrett,
6, Livery Street, Birmingham,
Agent to the Applicant.

page_text: Improvements in Screw Stocks and such like Screwing
Appliances.
I, JOHN BENTLEY of Ryland Road, Edgbaston, near Birmingham, in the
County of Warwick, Engineer, do hereby declare the nature of said invention for
"IMPROVEMENTS IN SCREW STOCKS AND BUCH LIKE SCREWING APPLIANCES,"
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :―
Screw stocks or screwing appliances have heretofore been provided with
fixed guides, which form steadying rests, in which an object to be wormed is
placed; that is, the guides which are made in one piece, are disposed in front of
the cutting dies-In the case of a solid die, the guide is concentric and is only
efficient when being used with an object of the same diameter; and further the
feed screw which carries forward a half die, leaves it there on its withdrawal.
By my said invention, the defects referred to are remedied by making the guides
adjustable to suit the varying diameters or sizes of objects to be wormed-The
feed screw is made to travel the half die, both backward and forward when rotated
either in one or other direction.
In carrying out my invention, the guides are made in halves or in segments,
respectively affixed to the half dies of the screw stock by pins, rivets or by any
other suitable means; that is, the guide consists of a short tube or sleeve divided
longitudinally or in segments, which are respectively attached to, and move with
the half dies, thereby rendering the guide adjustable to suit any required diameter
or size of object to be wormed-The axis. of the half guides always remaining.
perfectly concentric with the axis of the cutting orifice enclosed between the half
dies; thus the change of position of the half die to worm a greater or less object,
never disturbs the concentricity of the guide with respect to the cutting edges of
the dies.
By making guides thus adjustable, so as to embrace or truly encircle the object
to be wormed, it constitutes a true guide and rest; and the objects wormed by the
screw stock or guides provided with such a guide are both true and efficiently cut.
The method of carrying back a half die on the screwing back of the feed screw.
is effected as follows.
The feed screw for advancing the half die for bringing it upon its work may be
an independent screw which passes through the frame of the stock which may be
oblique or otherwise, or the feed screw may be made upon the end or a continuation
of one of the handles of the stock-The terminal inner end of the feed or advancing
crew is connected to the back of a half die, so that on rotating either in one or
other direction of the feed screw, the half die is made to advance or retire from
the other half die, consequent upon the diameter of object to be wormed, so that
the half die is made to slide backward or forward while the feed screw or object
moving it rotates, the connection between the movable half die and the end of the
feed screw or other advancing expedient is effected by a clutch like piece, which

page_text: lies within a cut away part in the back of the die, so that the requisite motion or
drawing back is effected as described-A like connection may be effected by
inserting the end of the feed screw into a hole or cavity in the back of the die,
and connecting the parts together by a lateral screw pin which takes into a groove
or annular depression formed near the end thereof; and further the end of the
feed screw may have a circular boss which takes into a suitably shaped hole in the
back of the die.
By such means the withdrawal of the half die is effected in a simple and
efficient manner so that the cutting edges of the movable die, can be taken out of
the threads of the object wormed, without the necessity of reversing the stock, or
causing the cutting edges of the dies to travel again over the worm already cut.
I will now proceed to describe with reference to the accompanying drawing the
manner in which the same is to be performed.
Figure 1 is a front elevation of a screw stock provided with improvements made
according to my invention, the worming dies being closed. Figure 2 is the same
with the dies open, or the traversing die withdrawn by the screw which gives the
retiring or advancing motion. Figure 3 is a longitudinal vertical section on the
dotted lines A B. Figure 4 is a back elevation of the stock and dies showing how
the connection is formed between the feed screw and the traversing half die.
Figure 5 is a transverse section on the dotted lines C D showing how the fork
like clutch embraces the neck on the feed screw. Figure 6 shows a front elevation
of the half dies and their guides separately and figure 7 is an end view of one of
the half dies, and the segmental guides carried by it.
The same letters of reference indicate corresponding parts in the several
'figures of the Drawing.
a is the body or frame of the stock which is one of the ordinary kind. b is a
stationary half die fitting within the rectangular opening a². This half die carries
guides 662 standing from the face of the said die. c is a movable half die which
also carries segmental guides c2 c like those on the stationary die. These guides
form steadying rests for giving lateral support to a tube or rod to be wormed;
so that these guides or lateral rests are portions of the segment of a circle, which
move with and form a part of the dies themselves; that is, they are incapable of
moving other than with the dies, and therefore always preserve that concentricity
which is necessary for the perfect screwing or worming of an object, in whatever
position the dies may be with respect to each other. d is a screw box wherein the
traversing die screw a works. The inner terminal end of the said screw e is
connected to the movable die c by a clutch or fork like connector f which connects
the said die to the end of the operating screw; that is, the clutch f is connected to
the die by screws or otherwise, and to the end of the operating screw by a forkod
end which embraces the neck e as best seen in figure 5 or the end of the
screw may be connected to the die by a collar on the end of the latter taking into
a similarly shaped recess on the former as represented in figure 8, which compels
the die to travel with the end of the screw in whatever direction the screw may
be operated.
By such means, the withdrawal of the half die is effected in a simple and
efficient manner without the necessity of reversing the stock, or causing the
cutting edges of the dies to travel again over a worm already cut, as is common
with stocks of the ordinary construction, where no means are devised for taking
the cutting edges out of the threads of an object wormed.
The application of my invention to other screwing appliances, differs in no
essential respect from its application to a screw stock already described.
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
First. Making the movable, or open dies of screw stocks and other screwing
appliances, carry the guide, or the segments of the guide, in order to compel the

page_text: guide, or segmental portions thereof to travel or move with the dies, or one of
them; for the purpose of preserving the perfect concentricity of the guide with
respect to the screwing orifice, substantially as described and illustrated."
Secondly. The improvements in screw stocks berein before described and
illustrated in the several figures of the Drawing; that is to say, connecting the
end of the operating or feed screw with the back of a movable half die, for the
purpose of traversing the said half die both to and fro or in both directions
substantially as and for the purpose as hereinbefore described and set forth.