Improved Means for Locking Nuts.
Year: 1897

page_text: Date of Application, 3rd Dec., 1897-Accepted, 22nd Jan., 1898
COMPLETE SPECIFICATION.
Improved Means for Locking Nuts.
I, JOHN INGRAM, of 7, Summer Hill, Parade, Birmingham, Warwickshire,
Metal Broker, 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 consists of the herein described improved means for locking a
screwed nut on a bolt or the like so as to effectually prevent the nut from turning
on the bolt and also preventing the bolt from turning in the nut.
I will describe my invention by referring to the accompanying drawing on
which Fig. 1 is a side elevation of a bolt and nut with my invention applied shewing
my invention acting on one of the flat sides of the nut; Fig. 2 is an end view of
the same; Fig. 3 is a plan of the same; Fig. 4 is a sectional side elevation of the
same; Fig. 5 shews the shank of the bolt separately and Figs. 6 and 7 shew parts
of the said nut lock represented in Figs. 1, 2, 3 and 4; Fig. 8 is a sectional
elevation and Fig. 9 is a side elevation of a bolt and nut shewing my Invention
acting upon one of the corners of the nut. Fig. 10 illustrates à modification of my
invention.
The same letters of reference indicate the same or corresponding parts in all the
figures of the drawing.
A is the bolt which is screw threaded at a' and B is the nut of the bolt which has
to be locked on the screw threaded part a¹. At the termination of the screw
threaded part a¹ of the bolt form a square part a2 which is a continuation of the
bolt and is made small enough for the nut 1 to pass over and beyond this square
part a the bolt is made round at a³ and screw threaded to take the small nut C
for the purpose hereinafter described. Fitting on the square part a² of the bolt
I provide the locking plate 1) which is shewn separately by Fig. 6 and is made
of angle shape with a square hole in one flange to fit on the square part a² of
the bolt A. The other flange d2 of this locking plate D is made so as to take
against one of the flat sides of the nut B as shewn in Figs. 1 and 4 and in this
flange d² there is a longitudinal groove d³ of the proper size to engage with one
of the corners of the nut as represented in Figs. 8 and 9 so that the flange d³ will
either engage with one of the flat sides of the nut B as shewn in Figs. 1, 2, 3 and 4
or with one of the corners of the nut as shewn in Figs. 8 and 9.
In using the nut lock the small nut C and the locking plate D have to be
removed from the bolt to permit of tightening up the nut B on the bolt A to its
desired position. The locking plate D is then placed on the square part a² of the
bolt A so that the flange d of the locking plate D will either engage with one of
the flat sides of the nut B as in Figs. 1, 2, 3 and 4 or with one of the corners or
the nut B as shewn in Figs. 8 and 9. The nut C is then screwed on to the end a³
of the bolt A so as to secure the locking plate D in place. Thus the nut B is by
the locking plate D effectually prevented from turning on the bolt A and also the
latter is effectually prevented from turning in the nut.
In order to secure the small nut C on the reduced end a³ of the bolt A I provide
on the locking plate D) a small locking piece E which fits in the slot d³ of the

page_text: locking plate D and is there secured by the screw F and is as shewn made to
engage with the nut C and prevent the same from turning in the same way that
the locking plate D prevents the nut B from turning. By an examination of Fig. 2
it will be seen that this locking piece E is made to take against one of the flat
sides of the nut Cand is by preference also made with a notch el so as to engage
with one of the corners of the nut Cif necessary, when the nut C is tightened up.
It will be seen that my invention is a perfect lock for the nut B as the bolt
and nut are effectually prevented from turning independently of one another by
the locking plate D which is fixed on the bolt A and cannot be removed therefrom
except by turning the nut C which latter is effectually locked by the locking piece E
secured to the locking plate D by the screw Fiwhich latter is not liable to become
loose as there is no strain upon it.
The shank part e³ of the locking piece E which fits in the slot d³ is by prefer-
ence made of a dovetailed shape as shewn and the slot d³ is also made of corre-
sponding form thereby the tendency of the nut C to turn and press outwardly
the locking piece S is resisted by the dovetailed sides of the slot d³ and does not
result in any strain on the screw F which secures the locking piece E to the
locking plate D.
دات عدي.
It will be evident that instead of the bolt being made square at a² and the hole
in the locking plate D being also made of square shape to fit on to the part a³,
the latter and the hole in the locking plate D may be made of any other shape
which will prevent the locking plate 1 from turning on the bolt A. It will be
also evident that my invention is applicable to locking hexagonal nuts similarly
as above described with reference to a square nut.
If desired the locking plate E with its screw, F may be dispensed with also the
locking plate D may be made without the slot so as to only take against one of
the sides of the nut and not engage with one of the angles of the same.
The small nut C may be dispensed with and instead thereof the locking plate D
may be secured on the bolt A by other means as by a split cotter G passing
through the end of the bolt as shewn in Fig. 10.
My invention is particularly applicable to locking the nuts of fish plate bolts
of railways and for all other purposes where the jar and vibration to which the
nut and bolt is subjected are liable to make the nut work loose unless it is effectually
locked.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. In combination with a screwed nut and boit or the like the employment of
an angle shaped locking plate which is so fixed on the end of the bolt which pro-
trudes through the nut as not to turn thereon said locking plate having a flange
which takes against one of the flat sides of the nut and prevents the same from
turning on the bolt, substantially as described.
2. In combination with a screwed nut and bolt or the like the employment of an
angle shaped locking plate which is so fixed on the end of the bolt which protrudes
through the nut as not to turn thereon said locking plate having a flange to take
against one of the flat sides of the nut and also having a longitudinal slot to engage
with one of the corners of the nut. so as to prevent the same from turning on the
bolt, substantially as described.
3. In combination with a screwed nut and bolt or the like the employment of
the angle shaped locking plate D fitting on a square or other non-cylindrical
part a on the end of the bolt which protrudes through the nut and secured thereon
by a smaller nut such as C or by a split cotter G said locking plate having a
flange which takes against one of the flat sides of the nut and which flange has
a longitudinal slot d³ to engage with one of the angles of the nut and prevent the
same from turning on the bolt, substantially as described.
4. In combination with a screwed nut and bolt or the like the employment of

page_text: the angle shaped locking plate D fitting on a square or other non-cylindrical
part a on the end of the bolt which protrudes through the nut and secured
thereon by a smaller nut C said locking plate having a flange d³ which takes
longitudinal slot d³ to
against one of the flat sides of the nut which flange has a
engage with one of the angles of the nut, and prevent the same from turning on
the bolt and has also a small locking piece E fixed in said slot to lock the said small
nut all substantially as described.
Dated this 26th day of November 1897.
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.