Improvements in Stocks and Dies.
Year: 1898

page_text: Date of Application, 26th Sept., 1898 -Accepted, 2nd Sept., 1899
Improvements in Stocks and Dies.
I, HANS OSKAR NIENSTAEDT, of Dronning Olgas Vej, 37, Copenhagen, Denmark,
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 separable
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 accompanying drawing in which:
Figures 1, 2, and 3 are respectively a plan, a side elevation and an end eleva-
tion of the tool.
Figure 4 shows the guide disc with its various guide holes.
Figures 5, 5 and 5° show respectively an end view, a front view and a plan
of one of the keys H and J.
Figures 6, Gband 6° illustrate respectively, a back view, a plan and a side
view of one of a pair of dies.
Figure 7 is a cross section through line V... W at right angles to the handles
of the die frame or stocks.
At the upper part of the frame A, Figure 3, two longitudinal rods B and C
are arranged between which slide the cutting jaws D and E of the die.
The rods B and C are provided with longitudinal slots G and F in which slide
the guide keys H and J details of which are given in Figures 5, 5b and 5º. Two
guide keys are inserted into each rod and are kept separate by means of
springs, K, K.
The guide keys project laterally through the rods B and C and fit into grooves P
made in the jaws E and D) which are thus provided with a definite longitudinal
travel. The guide keys are forced by the springs K, K, against the stopping
pins L, L, fixed in the jaws E and D), the result being that the jaws are per-
manently pressed apart, and made to bear against set screws X, X, fixed in the
two adjusting pieces M, N, which are made to move on pivots O, O, at the corners
of the tool frame. The adjusting pieces M, N are secured in their normal work-
ing position by means of two lock nuts Q, R, (provided with handles or thumb
pieces T) which are placed on the ends of a rod carried by the tool frame; these
nuts are provided with helical surfaces bearing on the adjusting pieces M, N,
so that a quarter turn of one nut 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 nuts
and the adjusting pieces M, N, with the jaws D, E, will be forced apart under the
action of the springs K. The jaws may then be moved clear of the screw thread.
A spiral spring U placed on the shaft S tends to twist it and the lock nuts Q, R,
back to their normal position, and to secure them in that position.
When the jaws have to be exchanged the lock nuts are turned round until
they disengage from the adjusting pieces M, N, which may then be folded back
so that the jaws are made perfectly free.

page_text: In order to prevent oblique cutting, that is to say the cutting of a so-called
drunk thread, with the tool, a circular guide disc, Figure 4, is placed in the tool
frame below the jaws. This guide disc is provided with holes of diameters corre-
sponding to the sizes of the bolts on which threads are to be cut. Each of these
holes is concentric with the jaws.
The guide disc (Fig. 4) is held in a recess 4 in the tool frame by means of the
cover 5, and may be fixed in the different working positions by means of a screw 6,
at the end of the handle, which jambs the disc when screwed up.
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. The die-stock substantially as set forth.
2. In a die-stock, a guide disc substantially as and for the purpose set forth.
3. In a die-stock, the combination with movable jaws of the adjusting
pieces M, N and lock nuts Q, R substantially as and for the purpose set forth.
4. The arrangement for separating the jaws substantially as set forth.
..
5. The arrangement and combination of parts substantially as set forth with
reference to Figures 1, 2 and 3.
6. In a die-stock, the guide keys acting substantially as and for the purpose
set forth.