Improved Nut-lock and Bolt.
Year: 1896

page_text: Date of Application, 14th May, 1896
Complete Specification Left, 9th Feb., 1897--Accepted, 13th Mar., 1897
Improved Nut-lock and Bolt.
We, JOHN THOMAS SANDERS of 180 Loop Street, City of Pietermaritzburg,
Colony of Natal, Engineer and WILLIAM HENRY NOTT, of 234 Berg Street, also
City of Pietermaritzburg, Colony of Natal, Draughtsman do hereby declare the
nature of this invention to be as follows:-
The essential features of our invention are: 1st. A bolt having a hole drilled at
its end, with a thread in an opposite direction to the thread on the bolt itself;
and 2nd. a detachable metal cap, lock, or holder fitting on to the nut when screwed
on to the bolt, and held in position by means of a screw passing through the cap,
lock, or holder and screwing itself into the hole at the end of the bolt already
mentioned threaded in an opposite direction to the bolt. In order that this
description may be readily understood, reference is made to the accompanying
drawing.
Fig. 1. is a plan of a bolt and nut embodying the features of our invention,
showing the nut A. screwed on the bolt B with the cap, lock, or holder D. held in
position by the screw E. countersunk, shown by dotted lines passing down the
bolt.
Fig. 2. is an end view of Fig. 1. and shows the cap D. kept in place on the
nut A. by the screw E.
Fig. 3. shows a plan and end view of the bolt B. with the nut taken off. The
hole F. in the end of the bolt is shown in the plan by dotted lines passing down
the bolt about of an inch threaded in an opposite direction to the thread on the
bolt B. and receives the screw E. which keeps the cap D. in position on the nut A.
Fig. 4. shows views of the cap, lock, or holder D. and the screw E. the thread of
which is made to suit the thread in the hole F. and is shown to be threaded in an
opposite way to that on the bolt B. The edge of the hole G. in the cap D. is
shown bevelled so that the screw E. when screwed in may come flush with the
surface of the cap D.
Fig. 5. is a variation of Fig. 1. the only difference being a modified form of the
cap D. so as to suit a nut that goes some way down the thread.
We do not limit ourselves to the particular shape or arrangement of nut-lock
shown in the drawing as other shape or arrangement embodying the same principle
Inay be used as found convenient.
Dated this 13th day of May 1896.
J. E. EVANS-JACKSON & Co.,
Agents for the Applicants.

page_text: COMPLETE SPECIFICATION.
Improved Nut-lock and Bolt.
We, JOHN THOMAS SANDERS, of 180 Loop Street. City of Pietermaritzburg,
Colony of Natal, Engineer, and WILLIAM HENRY NOTT, of 234 Berg Street,
also City of Pietermaritzburg, Colony of Natal, Draughtsman, 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:-
The essentials of our invention are, first, a bolt having a hole drilled at its end
with a thread in an opposite direction to the thread of the bolt itself, and second a
detachable cap, lock, or holder fitting on to the nut after the nut has been screwed
on to the bolt, which cap, lock, or holder, is held in position by means of a screw
passing through the cap, locker or holder, and screwing itself into the hole at the
end of the boit already mentioned, which screw is threaded in an opposite direction
to that on the bolt. In order that this description may be readily understood,
reference is made to the drawing filed with our Provisional Specification.
Fig. 1. is a plan of a bolt and nut embodying the features of our invention,
showing the nut A. screwed on the bolt B with the cap, lock or holder D. held
in position by the screw E. countersunk, shown by dotted lines passing down
the bolt.
Fig. 2. is an end view of Fig. 1. and shows the cap D. kept in place on the nut A.
by the screw E.
Fig. 3. shows a plan and end view of the bolt B. with the nut. taken off. The
hole F. in the end of the bolt, is shown in the plan by dotted lines passing down
the bolt about three quarters of an inch, threaded in an opposite direction to the
thread on the bolt B. and receives the screw E. which keeps the cap D. in position
on the nut A.
Fig. 4. shows views of the cap, lock, or holder D. and the screw E. the thread of
which is made to suit the thread in the hole F. and is shown to be threaded in an
opposite direction to the thread on the bolt B. The edge of the hole G. in the
cap D. is shown bevelled so that the screw E. when screwed on may come flush
with the cap D.
Fig. 5. is a variation of Fig. 1. the only difference being a modified form of the
cap D. so as to suit a nut that goes some way down the thread of a bolt.
The bolts and nuts to which our invention is intended to apply are the same as
the ordinary ones in use, and the nuts may be either square or hexagonal. Though
in the drawing the cap is shown to be doubled down the sides of the nut forming
lugs, this is not absolutely necessary; and in some cases the lock will not be
impaired if the cap is cut flush with the flats of the nut. It will also be observed
that the thread of the bolt is not interfered or tampered with in any way, neither is
the bolt weakened by the hole drilled in its end, because what is drilled out is
replaced again by the screw with the reverse or left-handed thread, which leaves
the nut at its original strength and weight. For a bolt and nut the size of that
shown in the drawing, a small screw about three quarters of an inch long and a
quarter of an inch in diameter holding an iron cap about of an inch thick will be
found amply strong enough and capable of resisting any strain ever likely to come
upon it during the lifetime of the bolt. In fact it is not possible once this lock is
put on, for to unscrew the nut off the bolt. It will break first, because the force
exerted to unscrew the nut immediately acts in a contrary direction by tightening
up the locking screw which has the effect of drawing the cap more firmly down
on to the nut, thus rendering it absolutely immovable. An ordinary screwdriver
will be found to be the most convenient for screwing and unscrewing the small

page_text: locking bolt or screw E. and the same screw and cap may be used many times over
in cases of broken bolts.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. The hole in the end of the bolt, substantially as and for the purpose set
forth.
2. The cap, lock or holder with a hole in its centre to receive a screw or bolt,
substantially as and for the purpose set forth.
3. The above described nut-lock used for locking nuts on bolts having for its
parts the cap, screw, and the hole in the end of the bolt, substantially as and for
the purposes set forth and illustrated.
Dated this 9th day of February 1897.
J. E. EVANS-JACKSON & Co.,
Agents for the Applicants.
J. E. EVANS-JACKSON & Co.,
Agents for the Applicants.