MENTS IN LOCKNUTS
Year: 1886

page_text: I, FRANCIS CHAMBERLAIN Blake Grove Road, Sheffield, in the County of York
Foundry Manager do hereby declare the nature of my said invention for IMPROVE
MENTS IN LOCKNUTS to be as follows:-
This Invention relates to an improved construction of locknut, or a method for
preventing nuts from becoming loose from any cause, upon their bolts or screws.
It consists in making a nut of the usual configuration, and tapped with a screw
thread as an ordinary nut, but the bottom surface of the nut instead of being hori-
zontal, or at a right angle with the vertical axis of the nut, is formed at an angle or
as if cut off obliquely. A slot or sawgate is cut partially through the nut, towards
the lower end or bottom of the nut, opening from the deepest side of the nut.
The slot or sawgate may be made in a direction parallel with the top face of the
nut but preferably I make it obliquely, or parallel with the inclined under surface
of the nut.
When the nut so constructed is screwed upon the bolt and is forced against the
face of the fish plate (for example)-the slot or sawgate is gradually closed until
the underface of the nut is horizontal and flat against the fishplate. This closing
of the sawgate causes the threads in the lower part of the nut to alter their position
or regularity in shape, and thus to grip very firmly the corresponding threads of
the bolt, and effectually preventing the nut from becoming loose from any cause
such as the jar of passing trains when used for securing fishplates.
1000
ROBT F. DRURY,
Agent for the Applicant.

page_text: unury manager do hereby declare the nature of my invention for IMPROVEMENTS
IN LOCKNUTS and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :—
My invention relates to improvements in the construction of "locknuts," or nuts
possessing an arrangement or contrivance for securing them upon their bolts or
screws, to prevent them becoming loose and shaking off.
It consists briefly in cutting one or more slots in the side of a nut, and forming
the base of the nut so that when it is screwed down to its place the pressure will
close the slot and cause the threads of the nut to grip those of the bolt.
And in order that my invention may be fully understood and clearly defined
I annex a sheet of drawings illustrating same, in which the same letters of reference
indicate the same parts in any of the figures.
Figs. 1, 2, 3, represent a nut made according to my invention, the position of the
slots or sawgates being varied.
Fig. 4, represents the nut Fig. 1. when it is screwed down.
Fig. 5, shows a nut with two sawgates.
Fig. 6, a modification of the invention.
My invention consists in the first place in making one or more slots A, from the
outside of the nut, and preferably near its base, extending through the centre hole
or thereabouts; these slots may be readily made by means of a saw, and they may
be made at any angle suitable to the purpose, such as horizontal, see Fig. 1, or
inclining downwards, Fig. 2, or upwards, Fig. 3.
In the second place, the bottom face of the nut instead of being horizontal or at
a right angle with the vertical axis of the nut, (as such nuts are usually made) is
bevilled or cut off obliquely, the deepest point being under mouth of the slot at B,
so that when the nut is screwed down it first comes in contact at B, and when
force is applied, the part marked C, is compressed until the slot is closed, and the
base is horizontal or thereabouts, as shown in Fig. 4.
This closing action slightly distorts or alters the regularity of the screwthreads
in the nut, causing a powerful gripping action between the threads of the nut and
those of the bolt, effectually preventing the nut turning round or becoming loose
from any cause, such as for instance, the shake or vibration caused by a passing
train when the nuts are applied to railway rail joints.
In Fig. 5, I illustrate the method of applying two slots or sawgates, one cut in
each opposite side of the nut, in which case the under face should be hollowed
as shown.
Fig. 6. shows how my invention may be modified without departing from the
chief idea which is to close up a slot formed partly through the nut so as to alter
the formation or regularity of the threads in the bolt hole. In this case a bevilled
washer D is used, and the bottom face of the nut is made horizontal or flat. A
somewhat similar result will be attained by forming (during manufacture) a small
projection or lump upon the bottom face of the nut at B.

page_text: Having now particularly described and ascertained the nature of my inven
tion, and in what manner the same is to be performed, I declare that what
I claim is :-
1. A nut having one or more side slots (such as A) cut either horizontally or at
an angle, and the base of the nut so formed as to close the said slot or slots when
screwed down, for the purpose specified, and substantially as herein before described
and illustrated.
2. A nut having one or more side slots, and a flat or horizontal under surface,
in combination with a bevilled washer or its equivalent, for the purpose of closing
the said slot or slots when the nut is screwed home, substantially as hereinbefore
described.