Year: 1899

page_text: Date of Application (in United Kingdom), 12th Dec., 1899
Complete Specification Left, 12th Sept., 1900-Accepted, 12th Dec., 1900
I, HANS OSKAR NIENSTAEDT, of Dronning Olgas Vej 37, Copenhagen, Den-
mark, Mechanical Engineer, do hereby declare the nature of this invention
to be as follows:-
This invention relates to screw-cutting stocks and dies, the jaws being separ-
able from each other in a simple manner by the rotation of two lock-nuts, so
that the return movement of the tool to its initial position can be effected rapidly.
By the employment of a rotating guide-dise the operator is saved the trouble
of actuating several loose parts when adjusting a fresh guide-hole.
The invention is illustrated by the accompanying drawings, in which:-
Figures 1, 2, and 4 are respectively a plan, a side elevation, and an end
elevation, of the tool. Figure 3 shows a slightly modified stock and dies.
At the upper part of the frame 1, Figure 2, two longitudinal rods 2 and 3
are arranged, between which slide the cutting jaws 4 and 5 of the die. The
rods 2 and 3 are provided with longitudinal slots, in which move the slides 6
and 7. Two guide keys are inserted into each rod and are kept separate by
means of springs 8, 8. The slides project laterally through the rods and 3
and fit into grooves made in the jaws 4 and 5. The slides are forced by the
springs 8, 8 against the stop pins 9, 9, fixed in the jaws 4 and 5, the result
being that the jaws are permanently pressed apart and made to bear against
set-screws 10, 10, fixed in the two adjusting-pieces 11, 12, which are made
to move on pivots 13, 13 at the corners of the tool-frame. The adjusting-
pieces 11, 12 are secured in their normal working position by means of the
two lock-lugs 14, 15, which are placed on the ends of a rod carried by the tool-
frame. These lugs are provided with helical surfaces bearing on the adjusting-
pieces 11, 12, so that a quarter-turn of one lug locks them in position. When
the tool has to be moved back to its initial position, all that is necessary is to
turn the lock-lugs, and the adjusting-pieces 11, 12, with the jaws 4, 5, will
be forced apart under the action of the springs 8. The jaws may then be
moved clear of the screw-thread produced on the blank.
A spiral spring 16, placed on the shaft 17, tends to twist it and the lock-
lugs 14, 15 back to their normal position and to secure them in that position.
When the jaws have to be exchanged, the lock-lugs are turned around until
they disengage from the adjusting-pieces 11, 12, which may then be folded
back, so that the jaws are made perfectly free.

page_text: On Fig. 3 is shown a modified arrangement for pressing the jaws apart. In-
stead of the spiral springs 8 two V-shaped springs 18 are used. These springs
keep the jaws apart and work in the same way as the spiral springs.
Diatal 11.
1
ր
1000
Jmprovements in Dye Stocks:
I, HANS OSKAR NIENSTAEDT, of Dronning Olgas Vej 37, Copenhagen, Den-
mark, Mechanical 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:-
This invention relates to screw-cutting stocks and dies, the jaws being separ-
able from each other in a simple manner by the rotation of two lock-nuts, so
that the return movement of the tool to its initial position can be effected rapidly.
By the employment of a rotating guide-disc the operator is saved the trouble
of actuating several loose parts when adjusting a fresh guide-hole.
The invention is illustrated by the drawings accompanying the Provisional
Specification, in which :-
Figures 1, 2, and 4 are respectively a plan, a side elevation, and an end
elevation, of the tool. Figure 3 shows a slightly-modified stock and dies.
At the upper part of the frame 1, Figure 2, two longitudinal rods 2 and 3
are arranged, between which slide the cutting-jaws 4 and 5 of the die. The
rods 2 and 3 are provided with longitudinal slots, in which move the slides 6
and 7. Two guide keys are inserted into each rod and are kept separate by
means of springs 8 8. The slides project laterally through the rods 2 and 3
and fit into grooves made in the jaws 4 and 5. The slides are forced by the
springs 88 against the stop pins 9 9, fixed in the jaws 4 and 5, the result
being that the jaws are permanently pressed apart and made to bear against
set-screws 10 10, fixed in the two adjusting-pieces 11 12, which are made
to move on pivots 13 13 at the corners of the tool-frame. The adjusting-
pieces 11 12 are secured in their normal working position by means of
two lock-lugs 14, 15, which are placed on the ends of a rod carried by the tool-
frame. These lugs are provided with helical surfaces bearing on the adjusting-
pieces 11 12, so that a quarter-turn of one lug locks them in position. When
the tool has to be moved back to its initial position, all that is necessary is to
turn the lock-lugs, and the adjusting-pieces 11 12, with the jaws 4 5, will
.be forced apart under the action of the springs 8. The jaws may then be
moved clear of the screw-thread produced on the blank.
A spiral spring 16, placed on the shaft 17, tends to twist it and the lock-
lugs 14 15 back to their normal position and to secure them in that position.
When the jaws have to be exchanged, the lock-lugs are turned around until
they disengage from the adjusting-pieces 11 12, which may then be folded
back, so that the jaws are made perfectly free.
On Figure 3 is shown a modified arrangement for pressing the jaws apart. In-
stead of the spiral springs 8 two V-shaped springs 18 are used. These springs
keep the jaws apart and work in the same way as the spiral springs.

page_text: Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, I declare that what
I claim is:-
1. A die-stock, comprising a frame, slidable jaws therein, springs for pressing
the jaws outward and end plates or adjusting-pieces pivoted to the stock at one
end and detachably secured thereto at the other end, the central portions of said
end plates forming stops to limit the outward movement of the jaws.
2. A die-stock, comprising a frame, slidable jaws therein, springs for pressing
the jaws outward and end plates or adjusting-pieces pivoted to the stock at one
end and detachably secured thereto at the other end, the central portions of said
end plates forming stops to limit the outward movement of the jaws, a shaft
arranged adjacent to said end plates, and lugs arranged on said shaft and having
inclined surfaces to engage the end plates.
3. A die-stock, comprising a frame, slidable jaws therein, springs for pressing
the jaws outward and end plates or adjusting-pieces pivoted to the stock at
one end and detachably secured thereto at the other end, the central portions of
said end plates forming stops to limit the outward movement of the jaws, a shaft
arranged adjacent to said end plates, and lugs arranged on said shaft and having
inclined surfaces to engage the end plates, and a torsional spring to turn said
shaft and lugs into the locking position.
4. A die-stock comprising a frame having slots or guideways, slides movable
therein, springs engaging the slides to press them apart, jaws provided with
slots and with limiting-pins both the slots and the pins being adapted to be
engaged by said slides.
5. A die-stock comprising a frame having slots or guideways, slides movable
therein, springs engaging the slides to press them apart, and jaws provided with
slots engaged by said slides.
Dated this 12th day of September 1900.
For the Applicant,
J. G. LORRAIN,
Norfolk House, Victoria Embankment, London, W.C.,
Chartered Patent Agent.