An Improved Lock-nut.
Year: 1894

page_text: An Improved Lock-nut.
We, ALFRED ARTHUR SURPLICE, of No. 28 Peel Street North Melbourne
in the Colony of Victoria, Engineer, and WILLIAM FARAM of No. 46 Leveson
Street North Melbourne aforesaid, Contractor, do hereby declare the nature of
this invention to be as follows:-
This invention relates to lock nuts which we make in two parts one of which has
a conical projection and is applied like an ordinary lock-nut, whilst the other part
is formed with a corresponding inversely conical recess adapted to receive the
conical projection on the other part which is split so that when screwed up tightly
in the first part, that is with its conical projection forced into the conical recess in
said first part it will be wedged tightly around the bolt and thus be held securely
thereupon.
If preferred the conical recess in the first part may be made completely through
same so that there will be no screw threads on it and thus it will be converted into
an internally conical shaped ring adapted to draw the split conical projection on
the second part tightly around the bolt.
Dated this Twenty-second day of November One thousand eight hundred and
winter form
We, ALFRED ARTHUR SURPLICE, of No. 28 Peel Street North Melbourne
in the Colony of Victoria, Engineer, and WILLIAM FARAM of No. 46 Leveson
Street, North Melbourne aforesaid, Contractor, 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 lock nuts which we make in one or more parts
according to the class of work for which they are designed as will be fully
explained further on.
For ordinary work we make it in two parts which may be termed male and
female nuts and consists in having a conical projection on the male or first part and
a corresponding inversely conical recess adapted to receive the conical projection in
the female or second part. The conical projection is split in one or more places
the entire length of the cone to allow of its springing and being compressed tightly
upon the bolt or other screwed body by the action of the conical recess in the
female part when forced over the said conical projection and is thus held securely
thereupon.

page_text: The internal thread in the male nut being continued throughout its entire
length prevents the thread of the bolt from being injured while the conical
projection is under compression.
If preferred the conical recess in the female nut may be made completely through
same so that there will be no screw thread therein and thus it will be converted
into an internally conical shaped ring or washer adapted to compress the split
conical projection on the male nut tightly around the bolt in which case the female
nut would require to be placed on the bolt first and the male nut to follow.
In many instances such as in fish plates and other like bed plates the conical
recess may be formed therein to receive the conical projection thus doing away
with the necessity of a second or female nut but where very severe jarring is
maintained it might even be desirable to have a conical projection on both sides of
the male nut one of which enters the said recess in the bed plate which acts as a
compressor whilst the other cone is operated upon by the conical recess in the
female nut which follows and likewise compresses thus making doubly secure.
From practical experiments which we have made exceedingly high results were
obtained from the use of two nuts each having a screw thread therein the male
nut was placed on first, the conical projection being split or cut into four sections,
and the female nut following the angle of cone and interval recess being exactly as
shown on accompanying drawing sheet.
Referring to the accompanying drawings Figure 1 is a side elevation of a bolt
fitted with a male and female lock nut according to this invention, Figure 2 being
a plan of the male nut, whilst Figure 3 represents a bolt in position fitted with a
modified form of said lock nut.
A represents the male part of lock nut and B the conical projection whilst
C represents the female part which is formed with the corresponding inversely
conical recess D into which said projection fits when the female part C is screwed
up tightly against the projection B. E represents the slits or cross cuts formed in
the conical projection B to enable this latter to be compressed or clamped tightly
around the bolt F.
The modification shown in Figure 3 consists as before mentioned in making the
conical recess D in the bed plate G and having a conical projection B on each side
of the male part A such projections being similarly engaged one by the recess D
in the bed plate G the other by recess D in the female nut C.
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 :-
The improved lock-nut herein described which is formed with a conical projection
on one or both sides having longitudinal splits or cross cuts the entire length of the
said projection or projections in combination with suitable metallic device or
devices having a correspondingly inverse conical recess adapted to receive said
projection or projections substantially as and for the purposes herein described
and explained and as illustrated in the accompanying drawings.
Dated this 20th day of Tule 100%
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.