Improvements in Machines for Twisting Rods or Bars.
Year: 1893

page_text: Date of Application, 23rd May, 1893-Accepted, 15th July, 1893
COMPLETE SPECIFICATION.
Improvements in Machines for Twisting Rods or Bars.
I, GEORGE HENRY SELLERS, Engineer, residing at 1301 Rodney Street, in
the City of Wilmington, County of Newcastle, and State of Delaware, one of the
United States of America, 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 :-
My invention relates to mechanism intended for twisting flanged bars, and is
especially intended and adapted for use in the manufacture of drill, &c., such as
are used and described in British Letters Patent granted to me December 23rd,
1890, and numbered 20,974; the object of my invention being to provide simple
and easily operated mechanism by which straight flanged bars can be twisted with
rapidity and precision to the required spiral form.
The nature of my invention will be best understood as described in connection
with the drawings in which it is illustrated, and in which,―
Figure 1, is a side elevation showing the operative parts of the machine
constructed in accordance with and embodying my improvement.
Figure 2, is a cross-section on the line 1-2 of Figure 1.
Figure 3, a cross-section on the line 3-4 of Figure 1.
Figure 4, an end elevation of the die holder and connected parts.
Figure 5, a perspective view of two of the sectional dies.
Figure 6, is a perspective view of one of the sectional dies with two sections
removed and showing the internal construction.
Figure 7, is a perspective view of the flanged bar.
Figure 8, a perspective view of the flanged bar after it is twisted, and―
Figure 9, is a view of a drill made from the twisted bar.
A. A are grooved rolls used in forming and feeding the flanged bar H;
B and B are two parts of a guide situated in front of the grooved rolls and
adapted to receive the flanged bar as it passes from between the rolls and carry it
to the twisting dies. The cavity B2 in the guides is such as will receive and
support the bar, preventing it from buckling under the pressure applied to it.
C, is a die holder supported as shown upon the rest bar D arranged in line with
the rolls and supporting the guides B B' as shown. The construction of the holder
must be such that it will support the sectional dies used in twisting against the
strains to which they are exposed, and, at the same time, permit of their ready
insertion and removal. As shown, the holder is provided with a cylindrical cavity,
at the top of which is formed a key seat C¹, and it is also adapted to receive at its
delivery end a stop or gate G, the function of which will be hereafter described.
E is a sectional twisting die made up of a number of sections e equal to the number
of flanges in the bar to be twisted, and each of which is adapted to lie between
adjacent flanges of the bar, and is given a curvature such as it is desired to impart
to the bar, thus, each sectional parte of the die has itself a spiral form, and I prefer
to make the length of the die, and of each section of it, equal to one-fourth of the
length taken up by a single turn imparted to the bar. Thus, for instance, where
the bar is twisted so as to make one complete turn in nine inches, the length of a
die E would be two and one-quarter inches (24"). A single sectional die of this
proportion may be used alone or it may be supplemented by additional sectional dies
as indicated at E' E and E³. When four are used as shown in Figure 1, the bar is
completely within the die for a distance of that equal to one twist. As shown in
the drawings the exterior form of the die is cylindrical; the diameter being such
as will enable it to be inserted in the cylindrical cavity of the holder, and as shown,
a groove or key-seat E' is formed along the periphery of the dies, so that when the

page_text: dies are inserted in the holder and arranged in proper alignment they can be locked
against rotary movement by the inserting of a key F engaging the groove in the
dies and the groove in the holder. In order to hold the dies against longitudinal
movement in the holder, a stop or gate as indicated at G can be thrust down
through a proper passage in the holder which will rest against the outermost die,
preventing the dies from being pushed out while forming the bar, and issue partly
through the spiral cavity E formed by the abutting sections.
I have indicated the flanged bar by the letter H; the flanges by the
letters &c. The spirally twisted bar is indicated at H' and at H2, Figure 9,
I have shown the end of the spirally twisted bar as cut to form a drill such as is
described in the Patent hereinbefore mentioned.
The operation of my apparatus is readily followed, and may briefly be described
as follows:
The die sections properly assembled are slipped into the holder and held in place
therein in any convenient way, such, for instance, as by the device above described.
The rolls A A' are then set in operation feeding a straight flanged bar through
the guides B B' which register with the cavity of the die E in the said die and
pushing it through the die; thus, necessarily twisting it to the desired form. After
leaving the die E the spirally twisted bar will continue through the dies E' E' &c.,
finally issuing from the end of the die system, and the holder, as soon as the bar
has passed from the bite of the rolls, its forward motion will stop, and then by
releasing it the holding device which hold the die sections in place, as shown, the
key F and gate G, the dies together with the twisted bar can be readily removed
from the holder, and in the same way another set of dies at once introduced into
the holder to act upon another bar.
It will be obvious that by making my die E sectional and removable from their
holder, I provide a ready and simple device for withdrawing the twisted bar from
them, while with a solid die the bar would have to be twisted out of the die, and
it will also be seen that by my sectional construction I avoid the danger due to
dies bursting under the pressure to which they are subjected wich exists with
solid dies.
I may mention that while I show a four flanged bar 1 do not confine myself to
any specific constructure, and my invention is applicable to twisting flat bars which
may be considered as having two flanges.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:
First. As a device for twisting flanged bars, a sectional twist die E made up of
parts e e e e equal to the number of flanges on the bar and each adapted to lie
between adjacent flanges.
Second. As a device for twisting flanged rods, a sectional twist die E made up
of parts e e e e equal to the number of flanges on the bar, and each adapted to lie
between adjacent flanges in combination with a box C adapted to hold the die
sections together while permitting their ready removal with a twisted bar.
Third. As a device for twisting flanged rods, a series of sectional twist
dies E E' &c., each made up of parts e e e e equal in number to the flanges on the
bar to be twisted, and each section adapted to lie between adjacent flanges, in
combination with a holder as box C adapted to hold the dies in position while
permitting their removal with a twisted bar.
Fourth. As a device for twisting flanged rods a pair of grooved rolls A A¹ in
combination with a die holder C situated in front thereof, and a twist die or dies E
made up of sections e e e e equal. to the number of flanges on the bar to be twisted,
and each adapted to lie between adjoining flanges, said sectional die or dies being
held in the holder C, but adapted to be readily removed therefrom.
Fifth. As a device for twisting flanged rods, a pair of grooved rolls A A' in
combination with a die holder C situated in front thereof; a guide B-B¹ leading

page_text: from the rolls to the die holder, and a twist die or dies E made up of sections e e e e
equal to the number of flanges on the bar to be twisted, and each adapted to lie
between adjoining flanges, said sectional die or dies being held in the holder C, but
adapted to be readily removed therefrom.
Dated this 23rd day of May 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.