Improvements in Locking Nuts.
Year: 1892

page_text: Date of Application, 14th Nov., 1892
Complete Specification Left, 14th Aug., 1893-Accepted, 23rd Sept., 1893
PROVISIONAL SPECIFICATION.
Improvements in Locking Nuts.
I FRANK MOTTERSHALL, 25 Birkin Avenue, Hyson Green, Nottingham,
Merchant, do hereby declare the nature of this invention to be as follows:-
This invention relates to spring locking nuts formed from a metal wire or bar
bent or coiled into a spiral form of any desired number of convolutions, and has for
its object to construct a nut of such form that it may be readily rotated upon its
corresponding bolt in one direction, but which is prevented from turning in the
opposite direction except when desired, and to prepare nuts from bars or rods so
formed that on being bent or coiled to form nuts having the required diameter of
hole their outer configurations are of the required form without any subsequent
shaping.
In a nut constructed according to the first part of this invention, a bar of suitable
cross-section is bent or coiled around an axis so as to form a right or left handed
spiral or helix, according as the screw thread to be formed in it is right or left
handed, and after it has been tapped with the required thread, that extremity
of the coil which is intended to be at the back of the nut is bent inwards towards
the axis so that on rotating the nut on its male screw or bolt in a forward direction
the inset end of the coil trails along the thread clipping it elastically, but on
attempting to rotate it in a reverse or backward direction the point of the inset end
of the spiral grips or bites into the surface of the bolt thread and prevents its
rotation. When it is desired to unscrew the nut from its bolt the inbent end is
simply struck with a chisel or otherwise bent up to remove the pressure from the
bolt thread when it can readily be removed in the usual manner. By cutting a
nick or groove across the threads on the tail of the spiral at a short distance from
its end, the said end may be bent sharply inwards to grip or bite the bolt or other
screw thread.
The second part of my invention consists in forming one side or edge of the bar
from which the nut is to be made of a longitudinally curved or wavy form, such
that when it is coiled the ridges or junctions of successive curves form the corners
of the nut, and the curved parts between the ridges the flats, without any
subsequent shaping, the pitch or distance between the successive ridges and
the form of the curves on the bar being determined tentatively in accordance
with the size of the nut and the number of sides or faces required.
Dated this 14th day of November 1892.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.
:
COMPLETE SPECIFICATION.
Improvements in Locking Nuts.
I, FRANK MOTTERSHALL, of 25 Birkin Avenue, Hyson Green, Nottingham,
Merchant, 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 spring locking nuts formed from metal wire or bar bent
or coiled into a spiral form of any desired number of convolutions, and has for its
object to construct a nut of such form that it may be readily rotated upon its
corresponding bolt in one direction, but which is prevented from turning in the
ᎱᎠ Ꮔ 11

page_text: opposite direction except when desired; and to prepare nuts from bars or rods so
formed that on being bent or coiled to form nuts having the required diameter
of hole their outer configurations are of the required form without any subsequent
shaping.
In the accompanying sheet of drawings
Figure 1 is an elevation of a locking nut constructed according to this invention
and Figure 2 is a plan of the same.
Figure 3 is a plan of a modification of the nut shown in Figures 1 and 2.
Figure 4 shows an elevation of part of a bar for the production of nuts of
polygonal form.
In a nut constructed as shown in Figures 1 and 2, a bar of suitable cross section
is bent or coiled around an axis so as to form a spiral or helix a and after it has
been tapped with the required thread, that extremity of the coil which is intended
to be at the back of the nut is bent inwards towards the axis so that on rotating
the nut on its male screw or bolt in a forward direction the inset end of the coil
trails along the thread clipping it elastically, but on attempting to rotate it in a
reverse or backward direction the point of the inset end of the spiral grips or bites
into the surface of the bolt thread and prevents its rotation. When it is desired
to unscrew the nut from its bolt the inbent end is simply struck with a chisel or
otherwise bent up to remove the pressure from the bolt thread, when it can readily
be removed in the usual manner. By cutting a nick or groove c across the threads
on the tail of the spiral at a short distance from its end, as shown in Figure 3, the
said end may be bent sharply inwards to grip or bite the bolt or other screw
thread.
The second part of my invention as represented in Figure 4 consists in forming
one side or edge of the bar from which the nut is to be made of a longitudinally
curved or wavy form such that when it is coiled the ridges or junctions of successive
curves d form the corners of the nut and the curved parts e, between the ridges,
the flat parts without any subsequent shaping, the pitch or distance between the
successive ridges and the form of the curves on the bar being determined
tentatively in accordance with the size of the nut and the number of sides or faces
required.
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. A spring locking nut consisting of a metal wire or bar bent or coiled into a
spiral or helical form and having its tail end bent inwards towards its axis so as to
cause it to grip or bite into the surface of the bolt thread and prevent its backward
rotation substantially as described.
2. In a spring locking nut consisting of a metal wire or bar bent or coiled into a
spiral or helical form, forming a nick or groove across the threads in the tail of
the spiral at a short distance from its end substantially as described and for the
purpose set forth.
3. In spiral locking nuts forming one side or edge of the bar from which
the nut is to be made of curved or wavy form substantially as described and for
the purpose set forth.
Dated this 14th day of August 1893.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.