Improved Manufacture of Semi-divided Bars of Steel and the like.
Year: 1891

page_text: Date of Application, 18th Nov., 1891
Complete Specification Left, 26th May, 1892-Accepted, 2nd July, 1892
PROVISIONAL SPECIFICATION.
.
Improved Manufacture of Semi-divided Bars of Steel and the like.
We SAMUEL WARD, WILLIAM GUEST, and WILLIAM MILLER trading
together as Wm. Mickelthwate & Co., Titanic and Avon Steel Works, Sheffield
in the County of York, Manufacturers, do hereby declare the nature of our
invention to be as follows:-
:
This invention has for its object to produce in an economical manner, bars of
steel or the like, having a longitudinal slit or division passing down the centre
of the bar from end to end, and extending in depth to three fourths of the
thickness of the bar, or to other required depth.
The manufacture of these semi-divided bars relates particularly to the production
of a special locking-nut for bolts which is slit or divided more than halfway through,
such slits usually being made by means of a saw, both a tedious and expensive
process.
We propose to accomplish the manufacture of these semi-divided bars entirely
by the process of rolling, and for this purpose when we have rolled the bar to the
desired rectangular cross section, we pass it between a pair of rolls, in which the
bottom roll has a groove or gate the bottom part being made to correspond with
and receive the said bar, and the upper part made tapering to an increased width.
The top roll is provided with a projecting annular cutter or knife edge, of
wedge like form, and this cutter is adjusted to a central position over the groove or
gate in the bottom roll.
When the bar of material is passed between the roll and the cutter which is
brought down to cut the required depth, the bar is drawn in, and divided by the
cutter, each divided side being pressed back into the upper tapered part of the
groove or gate before mentioned in bottom roll.
The division or cut is completed by passing the bar under a second circular knife
or cutter having a blunt edge which opens the bottom of the cut, the bar so formed
is then turned upon its edge, and passed between a pair of closing rolls which force
the parted edges of the bar nearly close together, (similar to a saw gate).
The nuts or their blanks are cut off the bar so constructed, and are completed
in the usual manner.
COMPLETE SPECIFICATION.
Improved Manufacture of Semi-divided' Bars of Steel and the like.
We, SAMUEL WARD, WILLIAM GUEST, and WILLIAM MILLER, trading as
Wm..Mickelthwate & Co., Titanic and Avon Steel Works, Sheffield in the County
of York, Manufacturers 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 has for its object to produce in an economical manner, bars of
steel, or the like, having a longitudinal slit or division down the centre of the bar
from end to end, and extending in depth to three fourths of the thickness of the
bar, or to other required depth.
The manufacture of the semi-divided bars relates to the production therefrom of
a special locknut for bolts, and other purposes, the said nut being slit or divided

page_text: "
more than half way through, such slits being at present made by sawing which is a
tedious and expensive process.
The annexed sheet of drawings illustrates our improved process of manufacture.
Fig. 1, represents an end view of a finished bar with the slit or division.
Fig. 2, the edge of the bar with the slit.
Fig. 3, elevation of a pair of rolls, with slitting cutters, and supporting grooves
or gates.
Fig. 4, end view of one of the rolls.
In carrying the invention into practice, we adopt the process of rolling, and in
the first place produce a solid bar of a section à little larger than that of the
finished size; and we would here remark that our process refers to bars of any
dimensions which vary in size to suit different sizes of nuts.
We then pass the bar to a pair of rolls such as those shown in Fig. 3, having a
series of nicking and slitting cutters in the top roll and a series of grooves or gates
in the bottom roll, to support the bar while it is being operated upon. The rolls
may be carried in the ordinary housing and be driven in the usual manner.
We pass the heated bar through the centre groove A, and under the nicking
edge B, by which a shallow groove or guiding nick is formed longitudinally down
the centre of the bar; the bar is then passed through the groove C, and under the
first slitting cutter D, which opens the bar to about half the required depth, the
operation is again repeated by passing the bar through groove E, and under
the cutter F, which divides the bar to the full length spreading out the divided
sides into the bevilled grooved.
The cut or slit bar is then passed through a pair of closing rolls either once or
as often as may be required to close the two sides and square up the bar as shown
in Figs. 1 and 2, in which the closed slit is marked S. The slitting cutters we
prefer to make of a ring shape or annular form, of steel, and secure them upon the
body of the roll by any suitable means, such as holding them up to a solid shoulder
by a collar G, fastened by set screws H, keys, or other equivalent means but
always so that the edge can be brought over the centre of the corresponding groove
in the bottom roll.
It must be understood that the arrangement of the cutters and grooves may be
altered, and that the number may be increased or diminished.
Having now described our invention and explained the manner of carrying it
into practice, what we wish to claim by Letters Patent is :-
-The process of manufacturing longitudinally semi-divided bars of steel or
other metal (as shown in Figs. 1 and 2,) by passing them in grooves formed in a
bottom roll, under a series of revolving circular cutters upon a top roll and finally
through closing rolls, in the manner substantially as hereinbefore described.
2-A bar of steel or other metal, semi-divided longitudinally, by passing it
through a series of grooves in a bottom roll under a corresponding series of
revolving cutters carried by a top roll and finally closed and finished between
ordinary rolls in the manner substantially as hereinbefore described.
Dated the 23rd day of May 1892.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicants.