Year: 1886

page_text: Date of Application, 1st Oct., 1886.
Complete Left, 24th June, 1887.
Complete Accepted, 5th Aug. 1887.
I, ALFRED JULIUS BOULT of 323 High Holborn, in the County of Middlesex,
Engineer, do hereby declare the nature of this invention to be as follows:-
-
This invention relates to bolts having the threaded end divided for the purpose of
spreading the two sides apart for locking the nut, and the objects of this invention are
to produce a better bolt with the full strength of metal and with a practically
continuous thread, and to produce said bolt at a small cost.
Prior to this invention bolts have been made with a divided end, the division being
formed by a saw which removed a portion of the stock and formed an open space or
break in the threads. In some cases the projecting part of the threaded end has been
split with a cold chisel after the nut was put on.
The threaded end of this bolt is split for some distance from the end, but the two
sides at the split end are so brought together that the split is not plainly discernable
except at the extreme end. Of course do not wish to confine myself to a bolt
in which the split is so concealed as to be invisible to the eye, but I prefer to so
construct it that the division is invisible unless the bolts are examined with unusual
attention. I prefer to form the bolt by first splitting the blank, when the iron is hot,
then pressing the two sides firmly together. The bolt can then be headed and
threaded in any ordinary manner, the thread being formed on the split end of the
bolt, and the end preferably rounded in which the thread is practically continuous
while the split is scarcely visible except at the extreme end of the bolt, where the
metal was depressed by the edge of the chisel before entering the heated end of the
rod or bolt blank.
When it is desired to lock the nut upon the bolt it is only necessary to drive a
chisel or wedge into the split end to spread the sides apart. The entrance of the
wedge is facilitated by the depression at the mouth of the split.
I do not wish to limit this invention to any particular process of manufacture.

page_text: I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
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 bolts having the threaded end divided for the purpose
of spreading the two sides apart for locking the nut, and the objects thereof are
to produce a better bolt with the full strength of metal and with a practically
continuous thread and to produce said bolt at a small cost.
In the accompanying drawings:
Fig. 1 is a side elevation of a split blank from which to make the bolt.
Fig. 2 is a like view of the same with the split end closed ready for threading.
Fig. 3 is a like view of the split blank fig. 1, together with a view of the splitting
chisel and a sectional view of the holding dies."
Fig. 4 is a like view of the same showing the use of the holding dies to close the
split end of the blank.
Fig. 5 is a side elevation of the bolt and nut ready for the market, and
Fig. 6 is a like view of the same with the split end opened to lock the nut.
Prior to this invention bolts have been made with a divided end the division being
formed by a saw which removed a portion of the stock and formed an open space
or break in the threads. In some cases the projecting part of the threaded end has
been split with a cold chisel, after the nut was put on.
The threaded end a of the bolt is split for some distance from the end, but the two
parts at the split end are so brought together that the split b is not plainly discernable
except at the extreme end. Of course the invention is not confined to a bolt in which
the split is so concealed as to be invisible to the eye, but it is preferred to so construct
them that the division is invisible unless the bolts are examined with unusual attention.
It is preferred to form the bolt by first splitting the blank while the iron is hot by
means of a chisel B whilst the blank is between holding dies A A as shown in fig. 3
then press the two sides firmly together as shown in figures 2 and 4. The bolt can
then be headed and threaded in any ordinary manner the thread being formed on
the split end of the bolt and the end preferably rounded as shown in fig. 5 in which
the thread is practically continuous while the split is scarcely visible except at the
extreme end of the bolt, where the metal was depressed by the edge of the chisel
before entering the heated end of the rod or bolt blank.

page_text: When it is desired to lock the nut upon the bolt it is only necessary to drive a
chisel or wedge into the split end to spread the sides apart as shown in fig. 6. The
entrance of the wedge is facilitated by the depression at the mouth of the split.
Whilst in compliance with the law one way of making the bolt is herein described it
is not intended to limit the invention to any particular process of manufacture but to
cover the bolt herein described whether made by the process described or some other
process that will produce the same article.
Having now particularly described and ascertained the nature of the said invention
and in what manner the same is to be performed, as communicated to me by my
foreign correspondent, I declare that what I claim is :
The herein described bolt having a portion of its threaded end when in a condition
to receive a nut, divided into two parts by a slit and with the parts upon opposite
sides of said slit resting directly against each other for practically the whole length of
the slit whereby said slit portion contains the same amount of metal as the corre-
sponding portion of a solid bolt and at the same time the said slit may extend into
the cylindrical hole of the nut when the nut is seated in place, substantially as
described.