Improvements in or relating to Nuts for Screwed Bolts and the like.
Year: 1891

page_text: Date of Application, 23rd Jan., 1891
Complete Specification Left, 12th Mar., 1891-Accepted, 18th Apr., 1891
PROVISIONAL SPECIFICATION.
Improvements in or relating to Nuts for Screwed Bolts and
the like.
:-
I, JOHN READ PEACOCK, of 8, Taylor's Cottages, London Road, Nottingham,
Pattern-maker, do hereby declare the nature of this invention to be as follows:-
The object of my invention is to form an improved nut, which automatically
locks itself when screwed on to bolts and the like.
For this purpose I form the nut with a slot or division at right angles to the
centre of the tapped hole in the nut, and nearly midway between the front and
back faces, and nearly across the same, almost cutting the nut in two: so as to
form two thin nuts joined together only on one side which forms a spring between
the two.
I form this slot either by sawing the nut or by bending over double the bar of
iron or steel of which it is formed into a flattened
I shape. One part of
this divided nut is then slightly twisted out of square with the other part, a hole
is drilled or punched through both, and then tapped to the required diameter while
in this twisted state. The two parts are then twisted back again, so as to become
symetrical and square one with another, when the screwed hole in one part will be
out of line with the screwed hole of the other.
When the nut is screwed on to the bolt, the two holes will be forced central one
with the other, and the cross action or spring in the two halves of the nut against
the bolt in opposite directions--which then ensues-effectually locks the nut on the
bolt, and prevents it being easily turned thereon.
Dated this 22nd day of January 1891.
H. WALKER HILL,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Nuts for Screwed Bolts and
the like.
I, JOHN READ PEACOCK, of 8, Taylor's Cottages, London Road, Nottingham,
Pattern-maker, 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 object of my invention is to form an improved nut, which automatically locks
itself when screwed on to bolts and the like.
For this purpose I form the nut with a slot or division at right angles to the
centre of the tapped hole in the nut, and nearly midway between the front and back
faces; and nearly across the same, almost cutting the nut in two so as to form two
thin nuts joined together only on one side, which forms a spring between the two.
I form this slot either by sawing the nut, or by bending over double the bar of iron
or steel of which it is formed, into a flattened shape.
One part of this divided nut is then slightly twisted out of square with the other
part; a hole is drilled or punched through both, and then tapped to the required
diameter, while in this twisted state. The two parts are then twisted back again,
so as to become symetrical and square one with the other, when the screwed hole
in one part will be out of line with the screwed hole of the other. When the nut
is screwed on to the bolt, the two holes will be forced central one with the other,
and the cross action or spring in the two halves of the nut against the bolt in
Price 8dI

page_text: square in form.
Figure 3 is a side elevation of the same nut lock, square in form.
Figure 4 is a longitudinal section in plan of my improved nut on line L., M. of
Fig. 3.
Figure 5 is an elevation of the nut lock shown screwed on to the bolt D.
Figure 6 is an elevation of my improved nut lock, as made hexagonal
in form.
Figure 7 is a plan of this hexagonal nut lock.
In all these views, I form the nut with a slot or division E at right angles to the
axis of the hole NF in the nut, and preferably midway in the nut; so as to form
two thin nuts A and B, joined together on one side C only, which forms a spring
between A and B. The slot E is formed either by sawing or by bending part A
over part B in a suitable manner. The hole N. Fis then formed in the nut, and
tapped to the required diameter, and afterwards the part A is slightly twisted out
of square with the part B; as shewn in Figs. 1 and 2. The tapped hole N in A
will now be out of line with the tapped hole in B; so that when the nut lock is
screwed on to a bolt D-Fig. 5 the bolt D will force the parts A and B almost
symetrical one with the other, as shewn in Fig. 5; and the cross or scissors action
of part A in one direction-shewn by the arrow, & of part B in the opposite
direction shewn by the other arrow-effectually locks the nut A. B on the bolt D,
and prevents it being easily turned thereon.
The locking power of parts A and B in opposite directions, can be 'regulated as
desired, either by the amount of metal left at part C, or by the amount of twist
given to part A in relation to part B; or both these combined.
When part B of the nut touches the fishplate or other article to be secured, the
spanner turning the nut is raised to grasp part A only; and the tendency in
then turning the nut further round, is to relieve the cross action of the nut A. B
on the bolt D, and thus allow the nut to be screwed quite home on the fishplate or
other article. Immediately power is taken from the spanner at A, the twisting
action of part C comes into force again to lock the nut A. B on the bolt D.
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 :-
1. Nut locks formed with the division E, in combination with the spring part C,
which is so twisted, that the tapped hole in part A, becomes slightly out of centre
with the tapped hole in part B; substantially as, and for the purpose herein before
described.
2. Forming nut locks with the spring part C, in combination with the
division E, and parts A and B, substantially arranged as, and for the purpose
set forth herein.
3. The combination in a nut lock, of part A bearing in one direction; with the

page_text: part B bearing in the opposite direction against bolt D; by reason of the twist
put in part C, and by which they are connected together; all substantially as
set forth.
4. In nut locks, the arrangement and combination of parts A, B, C and E,
substantially as herein described and shown in the drawings, and for the purpose
specified.
Dated this Eleventh day of March 1891.
H. WALKER HILL,
47, Hampden Street, Nottingham, Agent for the Applicant.