Improvements in Die Stocks and Dies.
Year: 1891

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COMPLETE SPECIFICATION.
Improvements in Die Stocks and Dies.
A communication from abroad by JAMES SANFORD FLETCHER and JOHN
SCHOTT EMMERT, both of the City of Chicago, State of Illinois and United
1States of America.
In
11, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street,
Manchester, both in the County of Lancaster, and 323, High Holborn, in the
County of Middlesex, Civil 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 die stocks and die therefor and has for its more.
prominent objects to accurately and effectively vary and determine the gauge of the
die with reference to the bolt or article to be operated upon; to provide a separable
die stock and die whereof the component members can be combined and used as a
convenient and efficient tool; to provide a die stock with a guide adapted to be
held therein by the same or substantially the same means employed for holding the
die; to adjust the die with great nicety and hold the same firmly in its adjustment;
to permit the die-stock or holder to be economically made; to generally simplify
the construction and to provide a simple, convenient and highly efficient tool for
threading bolts and rods.
To the attainment of the foregoing and other useful ends the invention consists in
matters hereinafter set forth and claimed.
In the accompanying drawings:-
Figure 1 is a central section through a die stock and die embodying the
invention, and also shows a bolt in the die.
Figure 2 is a plan of the same.
Figure 3 is a plan of the guide.
Figure 4 is a central section through the stock having its bore threaded from end
to end.
The die stock A is formed with a hub a, having one or more arms or handles a
which are arranged to permit an operator to readily take hold of them for the..
purpose of manipulating the instrument. The hub is provided with a conical or
tapered bore a² which is preferably threaded from end to end as in Figure 4,
although if desired, the said bore may be threaded along its end portions only, and
thereby leave between such threaded portions, an intervening unthreaded portion a³,
as in Figure 1.
The cutter or bolt threading die B is externally tapered in correspondence with
the tapered bore of the hub and is desirably externally threaded so that it can be
screwed into the same, it being also preferable that the die should be positioned
and arranged for adjustment within the smaller end portion of the conical or
tapered bore of the hub. The central opening in the die is preferably formed
with laterally arranged recesses or enlargements &¹ which serve to form recesses
or chambers through the die. These chambers or recesses receive the cuttings
from the bolt, and are arranged so as to leave certain wall portions 62 of the die
opening, which said wall portions are appropriately provided with threads or
cutters adapted for threading the bolt. The die is split longitudinally from end to
end through one of its sides, the split or gap C being formed so as to extend from
the threaded perimeter of the die to one of its said recesses b².
The split or gap C permits the die to expand and contract in conformity with the
diameter of the tapered bore a³ of the hub and hence the location of the die within
said tapered bore can be changed to determine or vary the gauge of the die.

page_text: The walls of said split or gap C, are provided with notches or recesses c for the
reception of a pin or wedge e which serves to wedge or jamb the die within the
tapered bore and thereby hold it in its adjusted position. While the split die
could be formed in various ways, the recesses b¹ therein are of further advantage in
that they render the die more elastic or capable of expansion and contraction in
conformity with the diameter of the bore in the hub, it being understood that by
adjusting the dic toward the smaller end of the bore in the hub it will be
contracted, while on the other hand, it will expand when adjusted toward the larger
end of the said bore.
A guide D is located within the other end of the tapered bore a², and is provided
with a central opening through which the bolt or rod to be threaded passes and
fits snugly. The exterior of said guide is tapered and screw threaded to fit the
screw threaded portion of the bore a² of the hub. The said guide is also provided
with a plurality of slots d', preferably three in number, which said slots serve to
provide means for receiving a wrench for turning the guide and also provide
passages through which the cuttings from the die may pass. Said slots also
provide for the passage of a suitable tool to act upon and displace the pin or
plug c¹.
The construction herein described provides a highly efficient and simple device
embracing a minimum number of parts combined in a durable manner. The split
die being located within the tapered bore of the hub affords convenient and simple
means for adjusting the gauge of the instrument, and such adjustment can be per-
manently secured by means of the wedge pin, which latter will prevent any
movement on the part of the die independently of the stock, without regard to the
strain to which it inay be subjected. It is herein understood that the employment
of screw threads as means for connecting the die and guide with the die stock is
regarded as the preferred and most desirable arrangement, but that for the broader
purpose of the invention various other mechanical expedients can be employed.
Thus for example, the conical bore of the hub could be unthreaded and the conical
split die could be driven therein as a wedge, in which case a spline upon one
member engaging in a groove in the other member will be desirable.
Also, the
bore could in such case while being made tapering, be of other form than conical.
And in like way, the guide could be wedged into a smooth bore in the hub. But
as hereinbefore mentioned, threading the bore of the hub or holder is preferred,
since by such arrangement the die and guide can be adjusted by turning them within
said bore, and moreover the bore can be easily and economically threaded.
By the use of the long hub and guide, no trouble whatever will be encountered in
properly starting the threads on a bolt or rod, and even the most inexperienced
person can easily operate the tool.
By arranging the die concentric with the conical or tapered wall of the bore in
said hub there will be no uneven strain upon the parts during use, and no liability
of disarrangement.
When the pin or wedge e' is removed from the die and the latter turned about
its axis (assuming it to have a threaded connection with the hub), the gap or
longitudinally arranged slot C in the die will close when said die is adjusted toward
the smaller end of the bore in the hub for the reason that the die is wedged in said
bore. Broadly considered therefore, a hub or holder having a tapered bore, and a
die adapted to wedge within said bore, are provided.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me
by my foreign correspondents, I declare that what I claim is :-
1. The combination of a die stock provided with a hub having a tapered bore
and a die adapted to wedge within said bore of the hub substantially as described.
2. The combination with a die-stock provided with a hub having a tapered screw
threaded bore, of an externally threaded die adapted for adjustment within said
threaded bore of the hub, substantially as described.

page_text: 3. The combination of a die stock provided with a hub having a conical screw
threaded bore, and an exteriorly threaded conical and adjustable die adapted to fit
within the threaded bore of said hub, substantially as described.
4. The combination of a die stock provided with a hub having a tapered bore, of
an externally tapered split die adapted to be set to different gauges by its adjustment
within said bore of the hub, substantially as described.
5. The combination of a conical die split by a longitudinally arranged slot, a
wedge adapted to determine the extent to which said slot can be closed and a die
stock having a hub provided with a tapered bore adapted to receive said die sub-
stantially as described.
6. The combination of a hub having a tapered bore an externally tapered die
provided with a centrally arranged bolt-hole, and a tapered guide provided with a
central hole adapted to freely pass the bolt, and slots to pass the chips cut by said
die, substantially as described.
Dated this 23rd day of February 1891.
WM. P. THOMPSON & Co.,
Agents for the Applicant.