Improvements in Screw-cutting Stocks and Dies.
Year: 1896

page_text: Date of Application. 7th Apr.. 1896
Complete Specification Left, 6th Jan., 1897-Accepted, 6th Feb., 1897
PROVISIONAL SPECIFICATION.
Improvements in Screw-cutting Stocks and Dies.
I, HUGO REISIGER of Korte Wijnstraat 8, Rotterdam, in the Kingdom of
Holland, Merchant, do hereby declare the nature of this invention to be as
follows:-
The present invention relates to new and improved stocks and dies for cutting
screw-threads, which have the advantage of enabling any number of exactly
uniform screw-threads to be cut each at a single operation and the screw holt itself
in case it be too large, to be turned down to the proper diameter with the aid of
this tool.
The die-stock consists of a frame with a strong stem or handle secured to it, the
other handle being as ordinarily, adjustable in the frame by means of a screw-
threaded portion so that by its aid the dies can be adjusted. The frame is closed
at one side by a plate, which may be either separate from or in one piece with the
frame. At the other side the frame is closed by a pivotted cover plate, which
may be fixed in place by a screw. In the hollow space thus produced the dies are
placed, one being stationary and the other movable by the aid of the adjustable
handle. The retracting of the movable die is effected by means of a hooked plate,
which engages with both the adjustable handle and the movable die. In order to
set the dies to the exact diameter of the thread to be cut, a gauge line is marked
on the frame and a similar line on the movable die, which lines, when in register,
indicate the correct position of the movable die. Besides, on the adjustable handle
outside the frame there is a nut, which can be fixed in place by a set screw, which
nut, after the movable die has been properly set, is screwed against the frame and
made fast in that position. The nut forms a means for the accurate and quick
setting of the dies and frame, even when the pivotted cover plate is closed and the
before-mentioned gauge lines are consequently obscured.
The construction of the dies is quite new. The screw cutting part of the die is
sharpened, as ordinary dies, which cut at one operation, so that with this arrange-
ment the metal is removed in several shavings by the consecutive cutting edges of
the dies till the proper depth of the thread is cut. The other part of the die,
which is preferably separated from the screw-cutting part by a recess, forms a
guide for the bolt and prevents the dies from being placed on it askew. The
lowest edge of this part which is preferably bevelled, forins a cutter which turns
the rough bolt to a cylindrical shape and to a proper size, in case of the bolt being
too large. If the bolt be nearly the right size, it need not be finished beforehand,
only in case it is considerably larger than the screw bolt when finished, its end
must be filed down or otherwise reduced in diameter till the first screw-cutting
edges can engage with it and effect its further movement in the longitudinal
direction.
Such an arrangement would make it impossible to cut a thread on a bolt right
up to its head; for this purpose the upper part of the screw threaded portion of
the dies as well as the lower portion is sharpened, so that in order to cut the thread
up to the bolt head, the stocks and dies are reversed and the screw-thread cutting
then proceeded with.
The upper and lower cover plates are provided with large holes for the passage

page_text: of the screw bolt and the bottom plate has besides at each end of the frame one
or more recesses for removing or allowing of the escape of the collecting dirt and
shavings.
BOULT & WADE,
Agents for the Applicant.
I, HUGO REISIGER of Korte Wijnstraat 8, Rotterdam, in the Kingdom of
Holland, Merchant, 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 present invention relates to new and improved stocks and dies for cutting
screw-threads, which have the advantage of enabling any number of exactly
uniform screw-threads to be cut each at a single operation and the screw bolt itself
in case it be too large, to be turned down to the proper diameter with the aid of
this tool.
In the accompanying drawings which illustrate my invention, Fig. 1 is a vertical
longitudinal section of my improved die-stock, Fig. 2 is a plan view of the same
and Fig. 3 shows one of the dies cutting a thread on a bolt.
The die-stock consists of a frame a with a strong stem or handle b secured to it,
the other handle c being as ordinarily, adjustable in the frame by means of a
screw-threaded portion c¹ so that by its aid the dies can be adjusted. The frame
is closed at one side by a plate d which may be either separate from or in one piece
with the frame. At the other side the frame is closed by a cover plate f which
pivots on a screw e and may be fixed in place by a screw e. In the hollow space
thus produced the dies g, g' are placed, one a being stationary and the other g¹
movable by the aid of the adjustable handle c. The retracting of the movable
die g¹ is effected by means of a hook i, which engages with the movable die gi and
is secured to the plate h of the adjustable handle c. In order to set the dies to the
exact diameter of the thread to be cut, a gauge line k is marked on the frame and
a similar line on the movable die, which lines, when in register, indicate the
correct position of the movable die. Besides on the adjustable handle outside the
frame there is a nut, m, which can be fixed in place by a set screw l, which nut,
after the movable die has been properly set, is screwed against the frame and
made fast in that position. The nut forms a means for the accurate and quick
setting of the dies and frame, even when the pivotted cover plate is closed and the
before-mentioned gauge lines are consequently obscured.
The construction of the die is quite new. The screw cutting part of the die is
sharpened at n, as ordinary dies, which cut at one operation, so that with this
arrangement the metal is removed in several shavings by the consecutive cutting
edges of the dies till the proper depth of the thread is cut. The part p of the
die, which is preferably separated from the screw-cutting part by a recess o forms
a guide for the bolt and prevents the dies from being placed on it askew. The
lowest edge of the part p which is preferably bevelled, forms a cutter p¹ which
turns the rough bolt to a cylindrical shape and to a proper size, in case of the
bolt being too large. If the bolt be nearly the right size, it need not be finished
beforehand, only in case it is considerably larger than the screw bolt when
finished, its end must be filed down or otherwise reduced in diameter till the first
screw-cutting edges can engage with it and effect its further movement in the
longitudinal direction.

page_text: Such an arrangement would make it impossible to cut a thread on a bolt right
up to its head; for this purpose the upper part n' of the screw threaded portion of
the dies as well as the lower portion n is sharpened, so that in order to cut the
thread up to the bolt head, the stocks and dies are reversed and the screw-thread
cutting then proceeded with.
The upper and lower cover plates are provided with large holes f, d¹ for the
passage of the screw bolt and the bottom plate has besides at each end of the
frame one or more recesses d for removing or allowing of the escape of
the collecting dirt and shavings.
Having now particularly described and ascertained the nature of this said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The improved screw-cutting stock and die as above described and illustrated
by the annexed drawings.
2. In a die-stock the combination with the adjustable handle having a screw-
threaded part, of a nut which may be screwed against the frame of the die-stock
and fastened on the adjustable handle by means of a set screw.
3. In a die-stock the combination with the pressing plate of the adjustable
handle, of a hook fitting in a recess of the moveable die in order to permit the
retracting of the said die.
4. A screw-cutting die characterized by a cylindrical part as p which may be
separated from the screwed part by a recess as o and serving as a guide for the
bolt to be wormed.
5. A screw-cutting die characterized by a bevelled edge as p¹ acting as a cutter
for turning the rough bolt, at its entrance to the stock, to a cylindrical shape and
a proper size.
6. A screw-cutting die characterized by sharpened edges as n, n¹ limiting the
screwed part and enabling the screw-cutting stock and dies to be employed in.
reversed position.
Dated this 6th day of January 1897.
L. DUVINAGE,
Agent for Applicant.